Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_MM_H |
| 2 | #define _LINUX_MM_H |
| 3 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #include <linux/errno.h> |
| 5 | |
| 6 | #ifdef __KERNEL__ |
| 7 | |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 8 | #include <linux/mmdebug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/gfp.h> |
Paul Gortmaker | 187f188 | 2011-11-23 20:12:59 -0500 | [diff] [blame] | 10 | #include <linux/bug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/list.h> |
| 12 | #include <linux/mmzone.h> |
| 13 | #include <linux/rbtree.h> |
Konstantin Khlebnikov | 83aeead | 2011-12-08 14:33:54 -0800 | [diff] [blame] | 14 | #include <linux/atomic.h> |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 15 | #include <linux/debug_locks.h> |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 16 | #include <linux/mm_types.h> |
Yinghai Lu | 0867721 | 2010-02-10 01:20:20 -0800 | [diff] [blame] | 17 | #include <linux/range.h> |
Chris Metcalf | c6f6b59 | 2010-05-24 14:32:53 -0700 | [diff] [blame] | 18 | #include <linux/pfn.h> |
Dan Williams | 3565fce | 2016-01-15 16:56:55 -0800 | [diff] [blame] | 19 | #include <linux/percpu-refcount.h> |
Andrea Arcangeli | e9da73d | 2011-01-13 15:46:32 -0800 | [diff] [blame] | 20 | #include <linux/bit_spinlock.h> |
Dave Chinner | b0d40c9 | 2011-07-08 14:14:42 +1000 | [diff] [blame] | 21 | #include <linux/shrinker.h> |
Cyrill Gorcunov | 9c59902 | 2014-10-09 15:27:29 -0700 | [diff] [blame] | 22 | #include <linux/resource.h> |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 23 | #include <linux/page_ext.h> |
Jan Kara | 8025e5d | 2015-07-13 11:55:44 -0300 | [diff] [blame] | 24 | #include <linux/err.h> |
Joonsoo Kim | fe896d1 | 2016-03-17 14:19:26 -0700 | [diff] [blame] | 25 | #include <linux/page_ref.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | struct mempolicy; |
| 28 | struct anon_vma; |
Michel Lespinasse | bf181b9 | 2012-10-08 16:31:39 -0700 | [diff] [blame] | 29 | struct anon_vma_chain; |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 30 | struct file_ra_state; |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 31 | struct user_struct; |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 32 | struct writeback_control; |
Tejun Heo | 682aa8e | 2015-05-28 14:50:53 -0400 | [diff] [blame] | 33 | struct bdi_writeback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Jiang Liu | fccc998 | 2013-07-03 15:04:23 -0700 | [diff] [blame] | 35 | #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | extern unsigned long max_mapnr; |
Jiang Liu | fccc998 | 2013-07-03 15:04:23 -0700 | [diff] [blame] | 37 | |
| 38 | static inline void set_max_mapnr(unsigned long limit) |
| 39 | { |
| 40 | max_mapnr = limit; |
| 41 | } |
| 42 | #else |
| 43 | static inline void set_max_mapnr(unsigned long limit) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #endif |
| 45 | |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 46 | extern unsigned long totalram_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | extern void * high_memory; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | extern int page_cluster; |
| 49 | |
| 50 | #ifdef CONFIG_SYSCTL |
| 51 | extern int sysctl_legacy_va_layout; |
| 52 | #else |
| 53 | #define sysctl_legacy_va_layout 0 |
| 54 | #endif |
| 55 | |
Daniel Cashman | d07e225 | 2016-01-14 15:19:53 -0800 | [diff] [blame] | 56 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
| 57 | extern const int mmap_rnd_bits_min; |
| 58 | extern const int mmap_rnd_bits_max; |
| 59 | extern int mmap_rnd_bits __read_mostly; |
| 60 | #endif |
| 61 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS |
| 62 | extern const int mmap_rnd_compat_bits_min; |
| 63 | extern const int mmap_rnd_compat_bits_max; |
| 64 | extern int mmap_rnd_compat_bits __read_mostly; |
| 65 | #endif |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <asm/page.h> |
| 68 | #include <asm/pgtable.h> |
| 69 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
Tang Chen | 79442ed | 2013-11-12 15:07:59 -0800 | [diff] [blame] | 71 | #ifndef __pa_symbol |
| 72 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) |
| 73 | #endif |
| 74 | |
Ard Biesheuvel | 1dff808 | 2016-04-18 18:04:57 +0200 | [diff] [blame] | 75 | #ifndef page_to_virt |
| 76 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x))) |
| 77 | #endif |
| 78 | |
Laura Abbott | 1492b65 | 2017-01-10 13:35:42 -0800 | [diff] [blame] | 79 | #ifndef lm_alias |
| 80 | #define lm_alias(x) __va(__pa_symbol(x)) |
| 81 | #endif |
| 82 | |
Dominik Dingel | 593befa | 2014-10-23 12:07:44 +0200 | [diff] [blame] | 83 | /* |
| 84 | * To prevent common memory management code establishing |
| 85 | * a zero page mapping on a read fault. |
| 86 | * This macro should be defined within <asm/pgtable.h>. |
| 87 | * s390 does this to prevent multiplexing of hardware bits |
| 88 | * related to the physical page in case of virtualization. |
| 89 | */ |
| 90 | #ifndef mm_forbids_zeropage |
| 91 | #define mm_forbids_zeropage(X) (0) |
| 92 | #endif |
| 93 | |
Andrey Ryabinin | ea606cf | 2016-03-17 14:18:48 -0700 | [diff] [blame] | 94 | /* |
| 95 | * Default maximum number of active map areas, this limits the number of vmas |
| 96 | * per mm struct. Users can overwrite this number by sysctl but there is a |
| 97 | * problem. |
| 98 | * |
| 99 | * When a program's coredump is generated as ELF format, a section is created |
| 100 | * per a vma. In ELF, the number of sections is represented in unsigned short. |
| 101 | * This means the number of sections should be smaller than 65535 at coredump. |
| 102 | * Because the kernel adds some informative sections to a image of program at |
| 103 | * generating coredump, we need some margin. The number of extra sections is |
| 104 | * 1-3 now and depends on arch. We use "5" as safe margin, here. |
| 105 | * |
| 106 | * ELF extended numbering allows more than 65535 sections, so 16-bit bound is |
| 107 | * not a hard limit any more. Although some userspace tools can be surprised by |
| 108 | * that. |
| 109 | */ |
| 110 | #define MAPCOUNT_ELF_CORE_MARGIN (5) |
| 111 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) |
| 112 | |
| 113 | extern int sysctl_max_map_count; |
| 114 | |
Andrew Shewmaker | c9b1d09 | 2013-04-29 15:08:10 -0700 | [diff] [blame] | 115 | extern unsigned long sysctl_user_reserve_kbytes; |
Andrew Shewmaker | 4eeab4f | 2013-04-29 15:08:11 -0700 | [diff] [blame] | 116 | extern unsigned long sysctl_admin_reserve_kbytes; |
Andrew Shewmaker | c9b1d09 | 2013-04-29 15:08:10 -0700 | [diff] [blame] | 117 | |
Jerome Marchand | 49f0ce5 | 2014-01-21 15:49:14 -0800 | [diff] [blame] | 118 | extern int sysctl_overcommit_memory; |
| 119 | extern int sysctl_overcommit_ratio; |
| 120 | extern unsigned long sysctl_overcommit_kbytes; |
| 121 | |
| 122 | extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *, |
| 123 | size_t *, loff_t *); |
| 124 | extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, |
| 125 | size_t *, loff_t *); |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
| 128 | |
Andrea Righi | 27ac792 | 2008-07-23 21:28:13 -0700 | [diff] [blame] | 129 | /* to align the pointer to the (next) page boundary */ |
| 130 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) |
| 131 | |
Andrew Morton | 0fa73b8 | 2013-07-03 15:02:11 -0700 | [diff] [blame] | 132 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
zijun_hu | 1061b0d2 | 2016-10-07 17:02:04 -0700 | [diff] [blame] | 133 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE) |
Andrew Morton | 0fa73b8 | 2013-07-03 15:02:11 -0700 | [diff] [blame] | 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | /* |
| 136 | * Linux kernel virtual memory manager primitives. |
| 137 | * The idea being to have a "virtual" mm in the same way |
| 138 | * we have a virtual fs - giving a cleaner interface to the |
| 139 | * mm details, and allowing different kinds of memory mappings |
| 140 | * (from shared memory to executable loading to arbitrary |
| 141 | * mmap() functions). |
| 142 | */ |
| 143 | |
Christoph Lameter | c43692e | 2006-12-06 20:32:48 -0800 | [diff] [blame] | 144 | extern struct kmem_cache *vm_area_cachep; |
| 145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | #ifndef CONFIG_MMU |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 147 | extern struct rb_root nommu_region_tree; |
| 148 | extern struct rw_semaphore nommu_region_sem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | extern unsigned int kobjsize(const void *objp); |
| 151 | #endif |
| 152 | |
| 153 | /* |
Hugh Dickins | 605d928 | 2008-08-16 11:07:21 +0100 | [diff] [blame] | 154 | * vm_flags in vm_area_struct, see mm_types.h. |
Kirill A. Shutemov | bcf6691 | 2016-03-17 14:18:53 -0700 | [diff] [blame] | 155 | * When changing, update also include/trace/events/mmflags.h |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | */ |
Konstantin Khlebnikov | cc2383e | 2012-10-08 16:28:37 -0700 | [diff] [blame] | 157 | #define VM_NONE 0x00000000 |
| 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | #define VM_READ 0x00000001 /* currently active flags */ |
| 160 | #define VM_WRITE 0x00000002 |
| 161 | #define VM_EXEC 0x00000004 |
| 162 | #define VM_SHARED 0x00000008 |
| 163 | |
Paolo 'Blaisorblade' Giarrusso | 7e2cff4 | 2005-09-21 09:55:39 -0700 | [diff] [blame] | 164 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
| 166 | #define VM_MAYWRITE 0x00000020 |
| 167 | #define VM_MAYEXEC 0x00000040 |
| 168 | #define VM_MAYSHARE 0x00000080 |
| 169 | |
| 170 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ |
Andrea Arcangeli | 16ba6f8 | 2015-09-04 15:46:17 -0700 | [diff] [blame] | 171 | #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 172 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
Andrea Arcangeli | 16ba6f8 | 2015-09-04 15:46:17 -0700 | [diff] [blame] | 174 | #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | #define VM_LOCKED 0x00002000 |
| 177 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ |
| 178 | |
| 179 | /* Used by sys_madvise() */ |
| 180 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ |
| 181 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ |
| 182 | |
| 183 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ |
| 184 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ |
Eric B Munson | de60f5f | 2015-11-05 18:51:36 -0800 | [diff] [blame] | 185 | #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
Andy Whitcroft | cdfd432 | 2008-07-23 21:27:28 -0700 | [diff] [blame] | 187 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
Konstantin Khlebnikov | cc2383e | 2012-10-08 16:28:37 -0700 | [diff] [blame] | 189 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
Qiaowei Ren | 4aae7e4 | 2014-11-14 07:18:25 -0800 | [diff] [blame] | 190 | #define VM_ARCH_2 0x02000000 |
Konstantin Khlebnikov | 0103bd1 | 2012-10-08 16:28:59 -0700 | [diff] [blame] | 191 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Cyrill Gorcunov | d9104d1 | 2013-09-11 14:22:24 -0700 | [diff] [blame] | 193 | #ifdef CONFIG_MEM_SOFT_DIRTY |
| 194 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ |
| 195 | #else |
| 196 | # define VM_SOFTDIRTY 0 |
| 197 | #endif |
| 198 | |
Jared Hulbert | b379d79 | 2008-04-28 02:12:58 -0700 | [diff] [blame] | 199 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
Konstantin Khlebnikov | cc2383e | 2012-10-08 16:28:37 -0700 | [diff] [blame] | 200 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
| 201 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ |
Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame] | 202 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
Nick Piggin | d00806b | 2007-07-19 01:46:57 -0700 | [diff] [blame] | 203 | |
Dave Hansen | 63c17fb | 2016-02-12 13:02:08 -0800 | [diff] [blame] | 204 | #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS |
| 205 | #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ |
| 206 | #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ |
| 207 | #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */ |
| 208 | #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ |
| 209 | #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) |
| 210 | #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) |
| 211 | #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) |
| 212 | #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) |
| 213 | #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ |
| 214 | |
Konstantin Khlebnikov | cc2383e | 2012-10-08 16:28:37 -0700 | [diff] [blame] | 215 | #if defined(CONFIG_X86) |
| 216 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ |
Dave Hansen | 8f62c88 | 2016-02-12 13:02:10 -0800 | [diff] [blame] | 217 | #if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS) |
| 218 | # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 |
| 219 | # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ |
| 220 | # define VM_PKEY_BIT1 VM_HIGH_ARCH_1 |
| 221 | # define VM_PKEY_BIT2 VM_HIGH_ARCH_2 |
| 222 | # define VM_PKEY_BIT3 VM_HIGH_ARCH_3 |
| 223 | #endif |
Konstantin Khlebnikov | cc2383e | 2012-10-08 16:28:37 -0700 | [diff] [blame] | 224 | #elif defined(CONFIG_PPC) |
| 225 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ |
| 226 | #elif defined(CONFIG_PARISC) |
| 227 | # define VM_GROWSUP VM_ARCH_1 |
James Hogan | 9ca52ed | 2012-10-16 10:16:14 +0100 | [diff] [blame] | 228 | #elif defined(CONFIG_METAG) |
| 229 | # define VM_GROWSUP VM_ARCH_1 |
Konstantin Khlebnikov | cc2383e | 2012-10-08 16:28:37 -0700 | [diff] [blame] | 230 | #elif defined(CONFIG_IA64) |
| 231 | # define VM_GROWSUP VM_ARCH_1 |
| 232 | #elif !defined(CONFIG_MMU) |
| 233 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ |
| 234 | #endif |
| 235 | |
Qiaowei Ren | 4aae7e4 | 2014-11-14 07:18:25 -0800 | [diff] [blame] | 236 | #if defined(CONFIG_X86) |
| 237 | /* MPX specific bounds table or bounds directory */ |
| 238 | # define VM_MPX VM_ARCH_2 |
| 239 | #endif |
| 240 | |
Konstantin Khlebnikov | cc2383e | 2012-10-08 16:28:37 -0700 | [diff] [blame] | 241 | #ifndef VM_GROWSUP |
| 242 | # define VM_GROWSUP VM_NONE |
| 243 | #endif |
| 244 | |
Mel Gorman | a8bef8ff | 2010-05-24 14:32:24 -0700 | [diff] [blame] | 245 | /* Bits set in the VMA until the stack is in its final location */ |
| 246 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) |
| 247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
| 249 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS |
| 250 | #endif |
| 251 | |
| 252 | #ifdef CONFIG_STACK_GROWSUP |
Konstantin Khlebnikov | 30bdbb7 | 2016-02-02 16:57:46 -0800 | [diff] [blame] | 253 | #define VM_STACK VM_GROWSUP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | #else |
Konstantin Khlebnikov | 30bdbb7 | 2016-02-02 16:57:46 -0800 | [diff] [blame] | 255 | #define VM_STACK VM_GROWSDOWN |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | #endif |
| 257 | |
Konstantin Khlebnikov | 30bdbb7 | 2016-02-02 16:57:46 -0800 | [diff] [blame] | 258 | #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
| 259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | /* |
Andrea Arcangeli | 78f11a2 | 2011-04-27 15:26:45 -0700 | [diff] [blame] | 261 | * Special vmas that are non-mergable, non-mlock()able. |
| 262 | * Note: mm/huge_memory.c VM_NO_THP depends on this definition. |
Nick Piggin | b291f00 | 2008-10-18 20:26:44 -0700 | [diff] [blame] | 263 | */ |
Vlastimil Babka | 9050d7e | 2014-03-03 15:38:27 -0800 | [diff] [blame] | 264 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
Nick Piggin | b291f00 | 2008-10-18 20:26:44 -0700 | [diff] [blame] | 265 | |
Alex Thorlton | a0715cc | 2014-04-07 15:37:10 -0700 | [diff] [blame] | 266 | /* This mask defines which mm->def_flags a process can inherit its parent */ |
| 267 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE |
| 268 | |
Eric B Munson | de60f5f | 2015-11-05 18:51:36 -0800 | [diff] [blame] | 269 | /* This mask is used to clear all the VMA flags used by mlock */ |
| 270 | #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) |
| 271 | |
Nick Piggin | b291f00 | 2008-10-18 20:26:44 -0700 | [diff] [blame] | 272 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | * mapping from the currently active vm_flags protection bits (the |
| 274 | * low four bits) to a page protection mask.. |
| 275 | */ |
| 276 | extern pgprot_t protection_map[16]; |
| 277 | |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 278 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
Kirill A. Shutemov | 9b4bdd2 | 2015-02-10 14:09:51 -0800 | [diff] [blame] | 279 | #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */ |
| 280 | #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */ |
| 281 | #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */ |
| 282 | #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */ |
| 283 | #define FAULT_FLAG_TRIED 0x20 /* Second try */ |
| 284 | #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */ |
Dave Hansen | 1b2ee12 | 2016-02-12 13:02:21 -0800 | [diff] [blame] | 285 | #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */ |
Dave Hansen | d61172b | 2016-02-12 13:02:24 -0800 | [diff] [blame] | 286 | #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 287 | |
venkatesh.pallipadi@intel.com | 6bd9cd5 | 2008-12-19 13:47:26 -0800 | [diff] [blame] | 288 | /* |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 289 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 290 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
| 291 | * of VM_FAULT_xxx flags that give details about how the fault was handled. |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 292 | * |
Michal Hocko | c20cd45 | 2016-01-14 15:20:12 -0800 | [diff] [blame] | 293 | * MM layer fills up gfp_mask for page allocations but fault handler might |
| 294 | * alter it if its implementation requires a different allocation context. |
| 295 | * |
Kirill A. Shutemov | 9b4bdd2 | 2015-02-10 14:09:51 -0800 | [diff] [blame] | 296 | * pgoff should be used in favour of virtual_address, if possible. |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 297 | */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 298 | struct vm_fault { |
| 299 | unsigned int flags; /* FAULT_FLAG_xxx flags */ |
Michal Hocko | c20cd45 | 2016-01-14 15:20:12 -0800 | [diff] [blame] | 300 | gfp_t gfp_mask; /* gfp mask to be used for allocations */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 301 | pgoff_t pgoff; /* Logical page offset based on vma */ |
| 302 | void __user *virtual_address; /* Faulting virtual address */ |
| 303 | |
Matthew Wilcox | 2e4cdab | 2015-02-16 15:58:50 -0800 | [diff] [blame] | 304 | struct page *cow_page; /* Handler may choose to COW */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 305 | struct page *page; /* ->fault handlers should return a |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 306 | * page here, unless VM_FAULT_NOPAGE |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 307 | * is set (which is also implied by |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 308 | * VM_FAULT_ERROR). |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 309 | */ |
Jan Kara | bc2466e | 2016-05-12 18:29:19 +0200 | [diff] [blame] | 310 | void *entry; /* ->fault handler can alternatively |
| 311 | * return locked DAX entry. In that |
| 312 | * case handler should return |
| 313 | * VM_FAULT_DAX_LOCKED and fill in |
| 314 | * entry here. |
| 315 | */ |
Kirill A. Shutemov | bae473a | 2016-07-26 15:25:20 -0700 | [diff] [blame] | 316 | }; |
| 317 | |
| 318 | /* |
| 319 | * Page fault context: passes though page fault handler instead of endless list |
| 320 | * of function arguments. |
| 321 | */ |
| 322 | struct fault_env { |
| 323 | struct vm_area_struct *vma; /* Target VMA */ |
| 324 | unsigned long address; /* Faulting virtual address */ |
| 325 | unsigned int flags; /* FAULT_FLAG_xxx flags */ |
| 326 | pmd_t *pmd; /* Pointer to pmd entry matching |
| 327 | * the 'address' |
| 328 | */ |
| 329 | pte_t *pte; /* Pointer to pte entry matching |
| 330 | * the 'address'. NULL if the page |
| 331 | * table hasn't been allocated. |
| 332 | */ |
| 333 | spinlock_t *ptl; /* Page table lock. |
| 334 | * Protects pte page table if 'pte' |
| 335 | * is not NULL, otherwise pmd. |
| 336 | */ |
Kirill A. Shutemov | 7267ec00 | 2016-07-26 15:25:23 -0700 | [diff] [blame] | 337 | pgtable_t prealloc_pte; /* Pre-allocated pte page table. |
| 338 | * vm_ops->map_pages() calls |
| 339 | * alloc_set_pte() from atomic context. |
| 340 | * do_fault_around() pre-allocates |
| 341 | * page table to avoid allocation from |
| 342 | * atomic context. |
| 343 | */ |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 344 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
| 346 | /* |
| 347 | * These are the virtual MM functions - opening of an area, closing and |
| 348 | * unmapping it (needed to keep files on disk up-to-date etc), pointer |
| 349 | * to the functions called when a no-page or a wp-page exception occurs. |
| 350 | */ |
| 351 | struct vm_operations_struct { |
| 352 | void (*open)(struct vm_area_struct * area); |
| 353 | void (*close)(struct vm_area_struct * area); |
Oleg Nesterov | 5477e70 | 2015-09-04 15:48:04 -0700 | [diff] [blame] | 354 | int (*mremap)(struct vm_area_struct * area); |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 355 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
Matthew Wilcox | b96375f | 2015-09-08 14:58:48 -0700 | [diff] [blame] | 356 | int (*pmd_fault)(struct vm_area_struct *, unsigned long address, |
| 357 | pmd_t *, unsigned int flags); |
Kirill A. Shutemov | bae473a | 2016-07-26 15:25:20 -0700 | [diff] [blame] | 358 | void (*map_pages)(struct fault_env *fe, |
| 359 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
David Howells | 9637a5e | 2006-06-23 02:03:43 -0700 | [diff] [blame] | 360 | |
| 361 | /* notification that a previously read-only page is about to become |
| 362 | * writable, if an error is returned it will cause a SIGBUS */ |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 363 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
Rik van Riel | 28b2ee2 | 2008-07-23 21:27:05 -0700 | [diff] [blame] | 364 | |
Boaz Harrosh | dd90618 | 2015-04-15 16:15:11 -0700 | [diff] [blame] | 365 | /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ |
| 366 | int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
| 367 | |
Rik van Riel | 28b2ee2 | 2008-07-23 21:27:05 -0700 | [diff] [blame] | 368 | /* called by access_process_vm when get_user_pages() fails, typically |
| 369 | * for use by special VMAs that can switch between memory and hardware |
| 370 | */ |
| 371 | int (*access)(struct vm_area_struct *vma, unsigned long addr, |
| 372 | void *buf, int len, int write); |
Andy Lutomirski | 78d683e | 2014-05-19 15:58:32 -0700 | [diff] [blame] | 373 | |
| 374 | /* Called by the /proc/PID/maps code to ask the vma whether it |
| 375 | * has a special name. Returning non-NULL will also cause this |
| 376 | * vma to be dumped unconditionally. */ |
| 377 | const char *(*name)(struct vm_area_struct *vma); |
| 378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | #ifdef CONFIG_NUMA |
Lee Schermerhorn | a6020ed | 2008-04-28 02:13:14 -0700 | [diff] [blame] | 380 | /* |
| 381 | * set_policy() op must add a reference to any non-NULL @new mempolicy |
| 382 | * to hold the policy upon return. Caller should pass NULL @new to |
| 383 | * remove a policy and fall back to surrounding context--i.e. do not |
| 384 | * install a MPOL_DEFAULT policy, nor the task or system default |
| 385 | * mempolicy. |
| 386 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
Lee Schermerhorn | a6020ed | 2008-04-28 02:13:14 -0700 | [diff] [blame] | 388 | |
| 389 | /* |
| 390 | * get_policy() op must add reference [mpol_get()] to any policy at |
| 391 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure |
| 392 | * in mm/mempolicy.c will do this automatically. |
| 393 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not |
| 394 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. |
| 395 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
| 396 | * must return NULL--i.e., do not "fallback" to task or system default |
| 397 | * policy. |
| 398 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
| 400 | unsigned long addr); |
| 401 | #endif |
David Vrabel | 667a0a0 | 2014-12-18 14:48:15 +0000 | [diff] [blame] | 402 | /* |
| 403 | * Called by vm_normal_page() for special PTEs to find the |
| 404 | * page for @addr. This is useful if the default behavior |
| 405 | * (using pte_page()) would not find the correct page. |
| 406 | */ |
| 407 | struct page *(*find_special_page)(struct vm_area_struct *vma, |
| 408 | unsigned long addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | }; |
| 410 | |
| 411 | struct mmu_gather; |
| 412 | struct inode; |
| 413 | |
Andrew Morton | 349aef0 | 2006-01-08 01:04:36 -0800 | [diff] [blame] | 414 | #define page_private(page) ((page)->private) |
| 415 | #define set_page_private(page, v) ((page)->private = (v)) |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 416 | |
Dan Williams | 5c7fb56 | 2016-01-15 16:56:52 -0800 | [diff] [blame] | 417 | #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE) |
| 418 | static inline int pmd_devmap(pmd_t pmd) |
| 419 | { |
| 420 | return 0; |
| 421 | } |
| 422 | #endif |
| 423 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | /* |
| 425 | * FIXME: take this include out, include page-flags.h in |
| 426 | * files which need it (119 of them) |
| 427 | */ |
| 428 | #include <linux/page-flags.h> |
Andrea Arcangeli | 71e3aac | 2011-01-13 15:46:52 -0800 | [diff] [blame] | 429 | #include <linux/huge_mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
| 431 | /* |
| 432 | * Methods to modify the page usage count. |
| 433 | * |
| 434 | * What counts for a page usage: |
| 435 | * - cache mapping (page->mapping) |
| 436 | * - private data (page->private) |
| 437 | * - page mapped in a task's page tables, each mapping |
| 438 | * is counted separately |
| 439 | * |
| 440 | * Also, many kernel routines increase the page count before a critical |
| 441 | * routine so they can be sure the page doesn't go away from under them. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | */ |
| 443 | |
| 444 | /* |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 445 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | */ |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 447 | static inline int put_page_testzero(struct page *page) |
| 448 | { |
Joonsoo Kim | fe896d1 | 2016-03-17 14:19:26 -0700 | [diff] [blame] | 449 | VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); |
| 450 | return page_ref_dec_and_test(page); |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 451 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
| 453 | /* |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 454 | * Try to grab a ref unless the page has a refcount of zero, return false if |
| 455 | * that is the case. |
Alexey Kardashevskiy | 8e0861f | 2013-08-28 18:37:42 +1000 | [diff] [blame] | 456 | * This can be called when MMU is off so it must not access |
| 457 | * any of the virtual mappings. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | */ |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 459 | static inline int get_page_unless_zero(struct page *page) |
| 460 | { |
Joonsoo Kim | fe896d1 | 2016-03-17 14:19:26 -0700 | [diff] [blame] | 461 | return page_ref_add_unless(page, 1, 0); |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 462 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
Wu Fengguang | 53df8fd | 2010-01-27 11:06:39 +0800 | [diff] [blame] | 464 | extern int page_is_ram(unsigned long pfn); |
Dan Williams | 124fe20 | 2015-08-10 23:07:05 -0400 | [diff] [blame] | 465 | |
| 466 | enum { |
| 467 | REGION_INTERSECTS, |
| 468 | REGION_DISJOINT, |
| 469 | REGION_MIXED, |
| 470 | }; |
| 471 | |
Toshi Kani | 1c29f25 | 2016-01-26 21:57:28 +0100 | [diff] [blame] | 472 | int region_intersects(resource_size_t offset, size_t size, unsigned long flags, |
| 473 | unsigned long desc); |
Wu Fengguang | 53df8fd | 2010-01-27 11:06:39 +0800 | [diff] [blame] | 474 | |
Christoph Lameter | 48667e7 | 2008-02-04 22:28:31 -0800 | [diff] [blame] | 475 | /* Support for virtually mapped pages */ |
Christoph Lameter | b3bdda0 | 2008-02-04 22:28:32 -0800 | [diff] [blame] | 476 | struct page *vmalloc_to_page(const void *addr); |
| 477 | unsigned long vmalloc_to_pfn(const void *addr); |
Christoph Lameter | 48667e7 | 2008-02-04 22:28:31 -0800 | [diff] [blame] | 478 | |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 479 | /* |
| 480 | * Determine if an address is within the vmalloc range |
| 481 | * |
| 482 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there |
| 483 | * is no special casing required. |
| 484 | */ |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 485 | |
Susheel Khiani | 8db21e1 | 2013-08-22 13:46:07 -0700 | [diff] [blame] | 486 | #ifdef CONFIG_MMU |
| 487 | extern int is_vmalloc_addr(const void *x); |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 488 | #else |
Susheel Khiani | 8db21e1 | 2013-08-22 13:46:07 -0700 | [diff] [blame] | 489 | static inline int is_vmalloc_addr(const void *x) |
| 490 | { |
| 491 | return 0; |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 492 | } |
Susheel Khiani | 8db21e1 | 2013-08-22 13:46:07 -0700 | [diff] [blame] | 493 | #endif |
| 494 | |
KAMEZAWA Hiroyuki | 81ac3ad | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 495 | #ifdef CONFIG_MMU |
| 496 | extern int is_vmalloc_or_module_addr(const void *x); |
| 497 | #else |
David Howells | 934831d | 2009-09-24 12:33:32 +0100 | [diff] [blame] | 498 | static inline int is_vmalloc_or_module_addr(const void *x) |
KAMEZAWA Hiroyuki | 81ac3ad | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 499 | { |
| 500 | return 0; |
| 501 | } |
| 502 | #endif |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 503 | |
Al Viro | 39f1f78 | 2014-05-06 14:02:53 -0400 | [diff] [blame] | 504 | extern void kvfree(const void *addr); |
| 505 | |
Kirill A. Shutemov | 53f9263 | 2016-01-15 16:53:42 -0800 | [diff] [blame] | 506 | static inline atomic_t *compound_mapcount_ptr(struct page *page) |
| 507 | { |
| 508 | return &page[1].compound_mapcount; |
| 509 | } |
| 510 | |
| 511 | static inline int compound_mapcount(struct page *page) |
| 512 | { |
Andrea Arcangeli | 5f527c2 | 2016-05-20 16:58:24 -0700 | [diff] [blame] | 513 | VM_BUG_ON_PAGE(!PageCompound(page), page); |
Kirill A. Shutemov | 53f9263 | 2016-01-15 16:53:42 -0800 | [diff] [blame] | 514 | page = compound_head(page); |
| 515 | return atomic_read(compound_mapcount_ptr(page)) + 1; |
| 516 | } |
| 517 | |
Joonsoo Kim | ccaafd7 | 2015-02-10 14:09:35 -0800 | [diff] [blame] | 518 | /* |
Andrea Arcangeli | 70b50f9 | 2011-11-02 13:36:59 -0700 | [diff] [blame] | 519 | * The atomic page->_mapcount, starts from -1: so that transitions |
| 520 | * both from it and to it can be tracked, using atomic_inc_and_test |
| 521 | * and atomic_add_negative(-1). |
| 522 | */ |
Mel Gorman | 22b751c | 2013-02-22 16:34:59 -0800 | [diff] [blame] | 523 | static inline void page_mapcount_reset(struct page *page) |
Andrea Arcangeli | 70b50f9 | 2011-11-02 13:36:59 -0700 | [diff] [blame] | 524 | { |
| 525 | atomic_set(&(page)->_mapcount, -1); |
| 526 | } |
| 527 | |
Kirill A. Shutemov | b20ce5e | 2016-01-15 16:54:37 -0800 | [diff] [blame] | 528 | int __page_mapcount(struct page *page); |
| 529 | |
Andrea Arcangeli | 70b50f9 | 2011-11-02 13:36:59 -0700 | [diff] [blame] | 530 | static inline int page_mapcount(struct page *page) |
| 531 | { |
Wang, Yalin | 1d148e2 | 2015-02-11 15:24:48 -0800 | [diff] [blame] | 532 | VM_BUG_ON_PAGE(PageSlab(page), page); |
Kirill A. Shutemov | 53f9263 | 2016-01-15 16:53:42 -0800 | [diff] [blame] | 533 | |
Kirill A. Shutemov | b20ce5e | 2016-01-15 16:54:37 -0800 | [diff] [blame] | 534 | if (unlikely(PageCompound(page))) |
| 535 | return __page_mapcount(page); |
| 536 | return atomic_read(&page->_mapcount) + 1; |
Andrea Arcangeli | 70b50f9 | 2011-11-02 13:36:59 -0700 | [diff] [blame] | 537 | } |
| 538 | |
Kirill A. Shutemov | b20ce5e | 2016-01-15 16:54:37 -0800 | [diff] [blame] | 539 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 540 | int total_mapcount(struct page *page); |
Andrea Arcangeli | 6d0a07e | 2016-05-12 15:42:25 -0700 | [diff] [blame] | 541 | int page_trans_huge_mapcount(struct page *page, int *total_mapcount); |
Kirill A. Shutemov | b20ce5e | 2016-01-15 16:54:37 -0800 | [diff] [blame] | 542 | #else |
| 543 | static inline int total_mapcount(struct page *page) |
| 544 | { |
| 545 | return page_mapcount(page); |
| 546 | } |
Andrea Arcangeli | 6d0a07e | 2016-05-12 15:42:25 -0700 | [diff] [blame] | 547 | static inline int page_trans_huge_mapcount(struct page *page, |
| 548 | int *total_mapcount) |
| 549 | { |
| 550 | int mapcount = page_mapcount(page); |
| 551 | if (total_mapcount) |
| 552 | *total_mapcount = mapcount; |
| 553 | return mapcount; |
| 554 | } |
Kirill A. Shutemov | b20ce5e | 2016-01-15 16:54:37 -0800 | [diff] [blame] | 555 | #endif |
| 556 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 557 | static inline struct page *virt_to_head_page(const void *x) |
| 558 | { |
| 559 | struct page *page = virt_to_page(x); |
Joonsoo Kim | ccaafd7 | 2015-02-10 14:09:35 -0800 | [diff] [blame] | 560 | |
Kirill A. Shutemov | 1d798ca | 2015-11-06 16:29:54 -0800 | [diff] [blame] | 561 | return compound_head(page); |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 562 | } |
| 563 | |
Kirill A. Shutemov | ddc58f2 | 2016-01-15 16:52:56 -0800 | [diff] [blame] | 564 | void __put_page(struct page *page); |
| 565 | |
Alexander Zarochentsev | 1d7ea73 | 2006-08-13 23:24:27 -0700 | [diff] [blame] | 566 | void put_pages_list(struct list_head *pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 568 | void split_page(struct page *page, unsigned int order); |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 569 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | /* |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 571 | * Compound pages have a destructor function. Provide a |
| 572 | * prototype for that function and accessor functions. |
Kirill A. Shutemov | f1e6155 | 2015-11-06 16:29:50 -0800 | [diff] [blame] | 573 | * These are _only_ valid on the head of a compound page. |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 574 | */ |
Kirill A. Shutemov | f1e6155 | 2015-11-06 16:29:50 -0800 | [diff] [blame] | 575 | typedef void compound_page_dtor(struct page *); |
| 576 | |
| 577 | /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */ |
| 578 | enum compound_dtor_id { |
| 579 | NULL_COMPOUND_DTOR, |
| 580 | COMPOUND_PAGE_DTOR, |
| 581 | #ifdef CONFIG_HUGETLB_PAGE |
| 582 | HUGETLB_PAGE_DTOR, |
| 583 | #endif |
Kirill A. Shutemov | 9a98225 | 2016-01-15 16:54:17 -0800 | [diff] [blame] | 584 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 585 | TRANSHUGE_PAGE_DTOR, |
| 586 | #endif |
Kirill A. Shutemov | f1e6155 | 2015-11-06 16:29:50 -0800 | [diff] [blame] | 587 | NR_COMPOUND_DTORS, |
| 588 | }; |
| 589 | extern compound_page_dtor * const compound_page_dtors[]; |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 590 | |
| 591 | static inline void set_compound_page_dtor(struct page *page, |
Kirill A. Shutemov | f1e6155 | 2015-11-06 16:29:50 -0800 | [diff] [blame] | 592 | enum compound_dtor_id compound_dtor) |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 593 | { |
Kirill A. Shutemov | f1e6155 | 2015-11-06 16:29:50 -0800 | [diff] [blame] | 594 | VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page); |
| 595 | page[1].compound_dtor = compound_dtor; |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 596 | } |
| 597 | |
| 598 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) |
| 599 | { |
Kirill A. Shutemov | f1e6155 | 2015-11-06 16:29:50 -0800 | [diff] [blame] | 600 | VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page); |
| 601 | return compound_page_dtors[page[1].compound_dtor]; |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 602 | } |
| 603 | |
Kirill A. Shutemov | d00181b | 2015-11-06 16:29:57 -0800 | [diff] [blame] | 604 | static inline unsigned int compound_order(struct page *page) |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 605 | { |
Christoph Lameter | 6d77795 | 2007-05-06 14:49:40 -0700 | [diff] [blame] | 606 | if (!PageHead(page)) |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 607 | return 0; |
Kirill A. Shutemov | e4b294c | 2015-02-11 15:24:46 -0800 | [diff] [blame] | 608 | return page[1].compound_order; |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 609 | } |
| 610 | |
Kirill A. Shutemov | f1e6155 | 2015-11-06 16:29:50 -0800 | [diff] [blame] | 611 | static inline void set_compound_order(struct page *page, unsigned int order) |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 612 | { |
Kirill A. Shutemov | e4b294c | 2015-02-11 15:24:46 -0800 | [diff] [blame] | 613 | page[1].compound_order = order; |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 614 | } |
| 615 | |
Kirill A. Shutemov | 9a98225 | 2016-01-15 16:54:17 -0800 | [diff] [blame] | 616 | void free_compound_page(struct page *page); |
| 617 | |
Michal Simek | 3dece37 | 2011-01-21 08:49:56 +0100 | [diff] [blame] | 618 | #ifdef CONFIG_MMU |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 619 | /* |
Andrea Arcangeli | 14fd403 | 2011-01-13 15:46:37 -0800 | [diff] [blame] | 620 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when |
| 621 | * servicing faults for write access. In the normal case, do always want |
| 622 | * pte_mkwrite. But get_user_pages can cause write faults for mappings |
| 623 | * that do not have writing enabled, when used by access_process_vm. |
| 624 | */ |
| 625 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) |
| 626 | { |
| 627 | if (likely(vma->vm_flags & VM_WRITE)) |
| 628 | pte = pte_mkwrite(pte); |
| 629 | return pte; |
| 630 | } |
Kirill A. Shutemov | 8c6e50b | 2014-04-07 15:37:18 -0700 | [diff] [blame] | 631 | |
Kirill A. Shutemov | 7267ec00 | 2016-07-26 15:25:23 -0700 | [diff] [blame] | 632 | int alloc_set_pte(struct fault_env *fe, struct mem_cgroup *memcg, |
| 633 | struct page *page); |
Michal Simek | 3dece37 | 2011-01-21 08:49:56 +0100 | [diff] [blame] | 634 | #endif |
Andrea Arcangeli | 14fd403 | 2011-01-13 15:46:37 -0800 | [diff] [blame] | 635 | |
| 636 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | * Multiple processes may "see" the same page. E.g. for untouched |
| 638 | * mappings of /dev/null, all processes see the same page full of |
| 639 | * zeroes, and text pages of executables and shared libraries have |
| 640 | * only one copy in memory, at most, normally. |
| 641 | * |
| 642 | * For the non-reserved pages, page_count(page) denotes a reference count. |
Paolo 'Blaisorblade' Giarrusso | 7e871b6 | 2005-09-21 09:55:38 -0700 | [diff] [blame] | 643 | * page_count() == 0 means the page is free. page->lru is then used for |
| 644 | * freelist management in the buddy allocator. |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 645 | * page_count() > 0 means the page has been allocated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 647 | * Pages are allocated by the slab allocator in order to provide memory |
| 648 | * to kmalloc and kmem_cache_alloc. In this case, the management of the |
| 649 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c |
| 650 | * unless a particular usage is carefully commented. (the responsibility of |
| 651 | * freeing the kmalloc memory is the caller's, of course). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 653 | * A page may be used by anyone else who does a __get_free_page(). |
| 654 | * In this case, page_count still tracks the references, and should only |
| 655 | * be used through the normal accessor functions. The top bits of page->flags |
| 656 | * and page->virtual store page management information, but all other fields |
| 657 | * are unused and could be used privately, carefully. The management of this |
| 658 | * page is the responsibility of the one who allocated it, and those who have |
| 659 | * subsequently been given references to it. |
| 660 | * |
| 661 | * The other pages (we may call them "pagecache pages") are completely |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
| 663 | * The following discussion applies only to them. |
| 664 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 665 | * A pagecache page contains an opaque `private' member, which belongs to the |
| 666 | * page's address_space. Usually, this is the address of a circular list of |
| 667 | * the page's disk buffers. PG_private must be set to tell the VM to call |
| 668 | * into the filesystem to release these pages. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 670 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
| 671 | * is the pointer to the inode, and page->index is the file offset of the page, |
Kirill A. Shutemov | ea1754a | 2016-04-01 15:29:48 +0300 | [diff] [blame] | 672 | * in units of PAGE_SIZE. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 674 | * If pagecache pages are not associated with an inode, they are said to be |
| 675 | * anonymous pages. These may become associated with the swapcache, and in that |
| 676 | * case PG_swapcache is set, and page->private is an offset into the swapcache. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 678 | * In either case (swapcache or inode backed), the pagecache itself holds one |
| 679 | * reference to the page. Setting PG_private should also increment the |
| 680 | * refcount. The each user mapping also has a reference to the page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 682 | * The pagecache pages are stored in a per-mapping radix tree, which is |
| 683 | * rooted at mapping->page_tree, and indexed by offset. |
| 684 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space |
| 685 | * lists, we instead now tag pages as dirty/writeback in the radix tree. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 687 | * All pagecache pages may be subject to I/O: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | * - inode pages may need to be read from disk, |
| 689 | * - inode pages which have been modified and are MAP_SHARED may need |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 690 | * to be written back to the inode on disk, |
| 691 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been |
| 692 | * modified may need to be swapped out to swap space and (later) to be read |
| 693 | * back into memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | */ |
| 695 | |
| 696 | /* |
| 697 | * The zone field is never updated after free_area_init_core() |
| 698 | * sets it, so none of the operations on it need to be atomic. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | */ |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 700 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 701 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
Andi Kleen | 07808b7 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 702 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 703 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
| 704 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 705 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 706 | |
| 707 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 708 | * Define the bit shifts to access each section. For non-existent |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 709 | * sections we define the shift as 0; that plus a 0 mask ensures |
| 710 | * the compiler will optimise away reference to them. |
| 711 | */ |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 712 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
| 713 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) |
| 714 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 715 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 716 | |
Will Deacon | bce54bb | 2010-10-26 14:21:37 -0700 | [diff] [blame] | 717 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
| 718 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 719 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 720 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
| 721 | SECTIONS_PGOFF : ZONES_PGOFF) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 722 | #else |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 723 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 724 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
| 725 | NODES_PGOFF : ZONES_PGOFF) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 726 | #endif |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 727 | |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 728 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 729 | |
Christoph Lameter | 9223b41 | 2008-04-28 02:12:48 -0700 | [diff] [blame] | 730 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
| 731 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 732 | #endif |
| 733 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 734 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
| 735 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) |
| 736 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) |
Srikar Dronamraju | 834a964 | 2014-04-07 15:37:57 -0700 | [diff] [blame] | 737 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 738 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 739 | |
Ian Campbell | 33dd4e0 | 2011-07-25 17:11:51 -0700 | [diff] [blame] | 740 | static inline enum zone_type page_zonenum(const struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | { |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 742 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Dan Williams | 260ae3f | 2016-01-15 16:56:17 -0800 | [diff] [blame] | 745 | #ifdef CONFIG_ZONE_DEVICE |
Dan Williams | 3565fce | 2016-01-15 16:56:55 -0800 | [diff] [blame] | 746 | void get_zone_device_page(struct page *page); |
| 747 | void put_zone_device_page(struct page *page); |
Dan Williams | 260ae3f | 2016-01-15 16:56:17 -0800 | [diff] [blame] | 748 | static inline bool is_zone_device_page(const struct page *page) |
| 749 | { |
| 750 | return page_zonenum(page) == ZONE_DEVICE; |
| 751 | } |
| 752 | #else |
Dan Williams | 3565fce | 2016-01-15 16:56:55 -0800 | [diff] [blame] | 753 | static inline void get_zone_device_page(struct page *page) |
| 754 | { |
| 755 | } |
| 756 | static inline void put_zone_device_page(struct page *page) |
| 757 | { |
| 758 | } |
Dan Williams | 260ae3f | 2016-01-15 16:56:17 -0800 | [diff] [blame] | 759 | static inline bool is_zone_device_page(const struct page *page) |
| 760 | { |
| 761 | return false; |
| 762 | } |
| 763 | #endif |
| 764 | |
Dan Williams | 3565fce | 2016-01-15 16:56:55 -0800 | [diff] [blame] | 765 | static inline void get_page(struct page *page) |
| 766 | { |
| 767 | page = compound_head(page); |
| 768 | /* |
| 769 | * Getting a normal page or the head of a compound page |
Joonsoo Kim | 0139aa7 | 2016-05-19 17:10:49 -0700 | [diff] [blame] | 770 | * requires to already have an elevated page->_refcount. |
Dan Williams | 3565fce | 2016-01-15 16:56:55 -0800 | [diff] [blame] | 771 | */ |
Joonsoo Kim | fe896d1 | 2016-03-17 14:19:26 -0700 | [diff] [blame] | 772 | VM_BUG_ON_PAGE(page_ref_count(page) <= 0, page); |
| 773 | page_ref_inc(page); |
Dan Williams | 3565fce | 2016-01-15 16:56:55 -0800 | [diff] [blame] | 774 | |
| 775 | if (unlikely(is_zone_device_page(page))) |
| 776 | get_zone_device_page(page); |
| 777 | } |
| 778 | |
| 779 | static inline void put_page(struct page *page) |
| 780 | { |
| 781 | page = compound_head(page); |
| 782 | |
| 783 | if (put_page_testzero(page)) |
| 784 | __put_page(page); |
| 785 | |
| 786 | if (unlikely(is_zone_device_page(page))) |
| 787 | put_zone_device_page(page); |
| 788 | } |
| 789 | |
Cody P Schafer | 9127ab4 | 2013-02-22 16:35:21 -0800 | [diff] [blame] | 790 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
| 791 | #define SECTION_IN_PAGE_FLAGS |
| 792 | #endif |
| 793 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 794 | /* |
Vlastimil Babka | 7a8010c | 2013-09-11 14:22:35 -0700 | [diff] [blame] | 795 | * The identification function is mainly used by the buddy allocator for |
| 796 | * determining if two pages could be buddies. We are not really identifying |
| 797 | * the zone since we could be using the section number id if we do not have |
| 798 | * node id available in page flags. |
| 799 | * We only guarantee that it will return the same value for two combinable |
| 800 | * pages in a zone. |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 801 | */ |
Andy Whitcroft | cb2b95e | 2006-06-23 02:03:01 -0700 | [diff] [blame] | 802 | static inline int page_zone_id(struct page *page) |
| 803 | { |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 804 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | } |
| 806 | |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 807 | static inline int zone_to_nid(struct zone *zone) |
Christoph Lameter | 89fa302 | 2006-09-25 23:31:55 -0700 | [diff] [blame] | 808 | { |
Christoph Lameter | d5f541e | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 809 | #ifdef CONFIG_NUMA |
| 810 | return zone->node; |
| 811 | #else |
| 812 | return 0; |
| 813 | #endif |
Christoph Lameter | 89fa302 | 2006-09-25 23:31:55 -0700 | [diff] [blame] | 814 | } |
| 815 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 816 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
Ian Campbell | 33dd4e0 | 2011-07-25 17:11:51 -0700 | [diff] [blame] | 817 | extern int page_to_nid(const struct page *page); |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 818 | #else |
Ian Campbell | 33dd4e0 | 2011-07-25 17:11:51 -0700 | [diff] [blame] | 819 | static inline int page_to_nid(const struct page *page) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 820 | { |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 821 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 822 | } |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 823 | #endif |
| 824 | |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 825 | #ifdef CONFIG_NUMA_BALANCING |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 826 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 827 | { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 828 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 829 | } |
| 830 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 831 | static inline int cpupid_to_pid(int cpupid) |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 832 | { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 833 | return cpupid & LAST__PID_MASK; |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 834 | } |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 835 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 836 | static inline int cpupid_to_cpu(int cpupid) |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 837 | { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 838 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 839 | } |
| 840 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 841 | static inline int cpupid_to_nid(int cpupid) |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 842 | { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 843 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 844 | } |
| 845 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 846 | static inline bool cpupid_pid_unset(int cpupid) |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 847 | { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 848 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 849 | } |
| 850 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 851 | static inline bool cpupid_cpu_unset(int cpupid) |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 852 | { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 853 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 854 | } |
| 855 | |
Peter Zijlstra | 8c8a743 | 2013-10-07 11:29:21 +0100 | [diff] [blame] | 856 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
| 857 | { |
| 858 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); |
| 859 | } |
| 860 | |
| 861 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 862 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
| 863 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 864 | { |
Liu Ping Fan | 1ae71d0 | 2014-03-03 15:38:39 -0800 | [diff] [blame] | 865 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 866 | } |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 867 | |
| 868 | static inline int page_cpupid_last(struct page *page) |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 869 | { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 870 | return page->_last_cpupid; |
| 871 | } |
| 872 | static inline void page_cpupid_reset_last(struct page *page) |
| 873 | { |
Liu Ping Fan | 1ae71d0 | 2014-03-03 15:38:39 -0800 | [diff] [blame] | 874 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 875 | } |
| 876 | #else |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 877 | static inline int page_cpupid_last(struct page *page) |
Peter Zijlstra | 75980e9 | 2013-02-22 16:34:32 -0800 | [diff] [blame] | 878 | { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 879 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
Peter Zijlstra | 75980e9 | 2013-02-22 16:34:32 -0800 | [diff] [blame] | 880 | } |
| 881 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 882 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
Peter Zijlstra | 75980e9 | 2013-02-22 16:34:32 -0800 | [diff] [blame] | 883 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 884 | static inline void page_cpupid_reset_last(struct page *page) |
Peter Zijlstra | 75980e9 | 2013-02-22 16:34:32 -0800 | [diff] [blame] | 885 | { |
Mel Gorman | 09940a4 | 2016-05-19 17:13:53 -0700 | [diff] [blame] | 886 | page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT; |
Peter Zijlstra | 75980e9 | 2013-02-22 16:34:32 -0800 | [diff] [blame] | 887 | } |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 888 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
| 889 | #else /* !CONFIG_NUMA_BALANCING */ |
| 890 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 891 | { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 892 | return page_to_nid(page); /* XXX */ |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 893 | } |
| 894 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 895 | static inline int page_cpupid_last(struct page *page) |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 896 | { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 897 | return page_to_nid(page); /* XXX */ |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 898 | } |
| 899 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 900 | static inline int cpupid_to_nid(int cpupid) |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 901 | { |
| 902 | return -1; |
| 903 | } |
| 904 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 905 | static inline int cpupid_to_pid(int cpupid) |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 906 | { |
| 907 | return -1; |
| 908 | } |
| 909 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 910 | static inline int cpupid_to_cpu(int cpupid) |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 911 | { |
| 912 | return -1; |
| 913 | } |
| 914 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 915 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
| 916 | { |
| 917 | return -1; |
| 918 | } |
| 919 | |
| 920 | static inline bool cpupid_pid_unset(int cpupid) |
Mel Gorman | b795854 | 2013-10-07 11:29:07 +0100 | [diff] [blame] | 921 | { |
| 922 | return 1; |
| 923 | } |
| 924 | |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 925 | static inline void page_cpupid_reset_last(struct page *page) |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 926 | { |
| 927 | } |
Peter Zijlstra | 8c8a743 | 2013-10-07 11:29:21 +0100 | [diff] [blame] | 928 | |
| 929 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) |
| 930 | { |
| 931 | return false; |
| 932 | } |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 933 | #endif /* CONFIG_NUMA_BALANCING */ |
Mel Gorman | 57e0a03 | 2012-11-12 09:06:20 +0000 | [diff] [blame] | 934 | |
Ian Campbell | 33dd4e0 | 2011-07-25 17:11:51 -0700 | [diff] [blame] | 935 | static inline struct zone *page_zone(const struct page *page) |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 936 | { |
| 937 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; |
| 938 | } |
| 939 | |
Mel Gorman | 75ef718 | 2016-07-28 15:45:24 -0700 | [diff] [blame] | 940 | static inline pg_data_t *page_pgdat(const struct page *page) |
| 941 | { |
| 942 | return NODE_DATA(page_to_nid(page)); |
| 943 | } |
| 944 | |
Cody P Schafer | 9127ab4 | 2013-02-22 16:35:21 -0800 | [diff] [blame] | 945 | #ifdef SECTION_IN_PAGE_FLAGS |
Daniel Kiper | bf4e890 | 2011-05-24 17:12:32 -0700 | [diff] [blame] | 946 | static inline void set_page_section(struct page *page, unsigned long section) |
| 947 | { |
| 948 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); |
| 949 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; |
| 950 | } |
| 951 | |
Ian Campbell | aa462ab | 2011-08-17 17:40:33 +0100 | [diff] [blame] | 952 | static inline unsigned long page_to_section(const struct page *page) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 953 | { |
| 954 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; |
| 955 | } |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 956 | #endif |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 957 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 958 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | { |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 960 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); |
| 961 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; |
| 962 | } |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 963 | |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 964 | static inline void set_page_node(struct page *page, unsigned long node) |
| 965 | { |
| 966 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); |
| 967 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; |
| 968 | } |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 969 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 970 | static inline void set_page_links(struct page *page, enum zone_type zone, |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 971 | unsigned long node, unsigned long pfn) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 972 | { |
| 973 | set_page_zone(page, zone); |
| 974 | set_page_node(page, node); |
Cody P Schafer | 9127ab4 | 2013-02-22 16:35:21 -0800 | [diff] [blame] | 975 | #ifdef SECTION_IN_PAGE_FLAGS |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 976 | set_page_section(page, pfn_to_section_nr(pfn)); |
Daniel Kiper | bf4e890 | 2011-05-24 17:12:32 -0700 | [diff] [blame] | 977 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | } |
| 979 | |
Greg Thelen | 0610c25 | 2015-10-01 15:37:02 -0700 | [diff] [blame] | 980 | #ifdef CONFIG_MEMCG |
| 981 | static inline struct mem_cgroup *page_memcg(struct page *page) |
| 982 | { |
| 983 | return page->mem_cgroup; |
| 984 | } |
Johannes Weiner | 55779ec | 2016-07-28 15:45:10 -0700 | [diff] [blame] | 985 | static inline struct mem_cgroup *page_memcg_rcu(struct page *page) |
| 986 | { |
| 987 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 988 | return READ_ONCE(page->mem_cgroup); |
| 989 | } |
Greg Thelen | 0610c25 | 2015-10-01 15:37:02 -0700 | [diff] [blame] | 990 | #else |
| 991 | static inline struct mem_cgroup *page_memcg(struct page *page) |
| 992 | { |
| 993 | return NULL; |
| 994 | } |
Johannes Weiner | 55779ec | 2016-07-28 15:45:10 -0700 | [diff] [blame] | 995 | static inline struct mem_cgroup *page_memcg_rcu(struct page *page) |
| 996 | { |
| 997 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 998 | return NULL; |
| 999 | } |
Greg Thelen | 0610c25 | 2015-10-01 15:37:02 -0700 | [diff] [blame] | 1000 | #endif |
| 1001 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1002 | /* |
| 1003 | * Some inline functions in vmstat.h depend on page_zone() |
| 1004 | */ |
| 1005 | #include <linux/vmstat.h> |
| 1006 | |
Ian Campbell | 33dd4e0 | 2011-07-25 17:11:51 -0700 | [diff] [blame] | 1007 | static __always_inline void *lowmem_page_address(const struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | { |
Ard Biesheuvel | 1dff808 | 2016-04-18 18:04:57 +0200 | [diff] [blame] | 1009 | return page_to_virt(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | } |
| 1011 | |
| 1012 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) |
| 1013 | #define HASHED_PAGE_VIRTUAL |
| 1014 | #endif |
| 1015 | |
| 1016 | #if defined(WANT_PAGE_VIRTUAL) |
Geert Uytterhoeven | f92f455 | 2014-01-21 15:48:47 -0800 | [diff] [blame] | 1017 | static inline void *page_address(const struct page *page) |
| 1018 | { |
| 1019 | return page->virtual; |
| 1020 | } |
| 1021 | static inline void set_page_address(struct page *page, void *address) |
| 1022 | { |
| 1023 | page->virtual = address; |
| 1024 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | #define page_address_init() do { } while(0) |
| 1026 | #endif |
| 1027 | |
| 1028 | #if defined(HASHED_PAGE_VIRTUAL) |
Ian Campbell | f991879 | 2011-08-17 13:45:09 +0100 | [diff] [blame] | 1029 | void *page_address(const struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | void set_page_address(struct page *page, void *virtual); |
| 1031 | void page_address_init(void); |
| 1032 | #endif |
| 1033 | |
| 1034 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) |
| 1035 | #define page_address(page) lowmem_page_address(page) |
| 1036 | #define set_page_address(page, address) do { } while(0) |
| 1037 | #define page_address_init() do { } while(0) |
| 1038 | #endif |
| 1039 | |
Kirill A. Shutemov | e39155e | 2015-04-15 16:14:53 -0700 | [diff] [blame] | 1040 | extern void *page_rmapping(struct page *page); |
| 1041 | extern struct anon_vma *page_anon_vma(struct page *page); |
Shaohua Li | 9800339 | 2013-02-22 16:34:35 -0800 | [diff] [blame] | 1042 | extern struct address_space *page_mapping(struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | |
Mel Gorman | f981c59 | 2012-07-31 16:44:47 -0700 | [diff] [blame] | 1044 | extern struct address_space *__page_file_mapping(struct page *); |
| 1045 | |
| 1046 | static inline |
| 1047 | struct address_space *page_file_mapping(struct page *page) |
| 1048 | { |
| 1049 | if (unlikely(PageSwapCache(page))) |
| 1050 | return __page_file_mapping(page); |
| 1051 | |
| 1052 | return page->mapping; |
| 1053 | } |
| 1054 | |
Huang Ying | f6ab1f7 | 2016-10-07 17:00:21 -0700 | [diff] [blame] | 1055 | extern pgoff_t __page_file_index(struct page *page); |
| 1056 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | /* |
| 1058 | * Return the pagecache index of the passed page. Regular pagecache pages |
Huang Ying | f6ab1f7 | 2016-10-07 17:00:21 -0700 | [diff] [blame] | 1059 | * use ->index whereas swapcache pages use swp_offset(->private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | */ |
| 1061 | static inline pgoff_t page_index(struct page *page) |
| 1062 | { |
| 1063 | if (unlikely(PageSwapCache(page))) |
Huang Ying | f6ab1f7 | 2016-10-07 17:00:21 -0700 | [diff] [blame] | 1064 | return __page_file_index(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | return page->index; |
| 1066 | } |
| 1067 | |
Andrew Morton | 1aa8aea | 2016-05-19 17:12:00 -0700 | [diff] [blame] | 1068 | bool page_mapped(struct page *page); |
Minchan Kim | bda807d | 2016-07-26 15:23:05 -0700 | [diff] [blame] | 1069 | struct address_space *page_mapping(struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | |
| 1071 | /* |
Michal Hocko | 2f064f3 | 2015-08-21 14:11:51 -0700 | [diff] [blame] | 1072 | * Return true only if the page has been allocated with |
| 1073 | * ALLOC_NO_WATERMARKS and the low watermark was not |
| 1074 | * met implying that the system is under some pressure. |
| 1075 | */ |
| 1076 | static inline bool page_is_pfmemalloc(struct page *page) |
| 1077 | { |
| 1078 | /* |
| 1079 | * Page index cannot be this large so this must be |
| 1080 | * a pfmemalloc page. |
| 1081 | */ |
| 1082 | return page->index == -1UL; |
| 1083 | } |
| 1084 | |
| 1085 | /* |
| 1086 | * Only to be called by the page allocator on a freshly allocated |
| 1087 | * page. |
| 1088 | */ |
| 1089 | static inline void set_page_pfmemalloc(struct page *page) |
| 1090 | { |
| 1091 | page->index = -1UL; |
| 1092 | } |
| 1093 | |
| 1094 | static inline void clear_page_pfmemalloc(struct page *page) |
| 1095 | { |
| 1096 | page->index = 0; |
| 1097 | } |
| 1098 | |
| 1099 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | * Different kinds of faults, as returned by handle_mm_fault(). |
| 1101 | * Used to decide whether a process gets delivered SIGBUS or |
| 1102 | * just gets major/minor fault counters bumped up. |
| 1103 | */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 1104 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 1105 | #define VM_FAULT_OOM 0x0001 |
| 1106 | #define VM_FAULT_SIGBUS 0x0002 |
| 1107 | #define VM_FAULT_MAJOR 0x0004 |
| 1108 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ |
Andi Kleen | aa50d3a | 2010-10-06 21:45:00 +0200 | [diff] [blame] | 1109 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ |
| 1110 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ |
Linus Torvalds | 33692f2 | 2015-01-29 10:51:32 -0800 | [diff] [blame] | 1111 | #define VM_FAULT_SIGSEGV 0x0040 |
Nick Piggin | f33ea7f | 2005-08-03 20:24:01 +1000 | [diff] [blame] | 1112 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 1113 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
| 1114 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ |
Michel Lespinasse | d065bd8 | 2010-10-26 14:21:57 -0700 | [diff] [blame] | 1115 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ |
Kirill A. Shutemov | c029255 | 2013-09-12 15:14:05 -0700 | [diff] [blame] | 1116 | #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */ |
Jan Kara | bc2466e | 2016-05-12 18:29:19 +0200 | [diff] [blame] | 1117 | #define VM_FAULT_DAX_LOCKED 0x1000 /* ->fault has locked DAX entry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
Andi Kleen | aa50d3a | 2010-10-06 21:45:00 +0200 | [diff] [blame] | 1119 | #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ |
| 1120 | |
Linus Torvalds | 33692f2 | 2015-01-29 10:51:32 -0800 | [diff] [blame] | 1121 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \ |
| 1122 | VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \ |
| 1123 | VM_FAULT_FALLBACK) |
Andi Kleen | aa50d3a | 2010-10-06 21:45:00 +0200 | [diff] [blame] | 1124 | |
| 1125 | /* Encode hstate index for a hwpoisoned large page */ |
| 1126 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12) |
| 1127 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 1128 | |
Nick Piggin | 1c0fe6e | 2009-01-06 14:38:59 -0800 | [diff] [blame] | 1129 | /* |
| 1130 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. |
| 1131 | */ |
| 1132 | extern void pagefault_out_of_memory(void); |
| 1133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
| 1135 | |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 1136 | /* |
David Rientjes | 7bf02ea | 2011-05-24 17:11:16 -0700 | [diff] [blame] | 1137 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 1138 | * various contexts. |
| 1139 | */ |
David Rientjes | 4b59e6c | 2013-04-29 15:06:11 -0700 | [diff] [blame] | 1140 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
David Rientjes | ddd588b | 2011-03-22 16:30:46 -0700 | [diff] [blame] | 1141 | |
David Rientjes | 7bf02ea | 2011-05-24 17:11:16 -0700 | [diff] [blame] | 1142 | extern void show_free_areas(unsigned int flags); |
| 1143 | extern bool skip_free_areas_node(unsigned int flags, int nid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
John Stultz | 6f19367 | 2011-12-15 18:51:04 -0800 | [diff] [blame] | 1145 | void shmem_set_file(struct vm_area_struct *vma, struct file *file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | int shmem_zero_setup(struct vm_area_struct *); |
Johannes Weiner | 0cd6144 | 2014-04-03 14:47:46 -0700 | [diff] [blame] | 1147 | #ifdef CONFIG_SHMEM |
| 1148 | bool shmem_mapping(struct address_space *mapping); |
| 1149 | #else |
| 1150 | static inline bool shmem_mapping(struct address_space *mapping) |
| 1151 | { |
| 1152 | return false; |
| 1153 | } |
| 1154 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | |
Wang Xiaoqiang | 7f43add | 2016-01-15 16:57:22 -0800 | [diff] [blame] | 1156 | extern bool can_do_mlock(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | extern int user_shm_lock(size_t, struct user_struct *); |
| 1158 | extern void user_shm_unlock(size_t, struct user_struct *); |
| 1159 | |
| 1160 | /* |
| 1161 | * Parameter block passed down to zap_pte_range in exceptional cases. |
| 1162 | */ |
| 1163 | struct zap_details { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | struct address_space *check_mapping; /* Check page->mapping if set */ |
| 1165 | pgoff_t first_index; /* Lowest page->index to unmap */ |
| 1166 | pgoff_t last_index; /* Highest page->index to unmap */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | }; |
| 1168 | |
Nick Piggin | 7e67513 | 2008-04-28 02:13:00 -0700 | [diff] [blame] | 1169 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
| 1170 | pte_t pte); |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1171 | struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr, |
| 1172 | pmd_t pmd); |
Nick Piggin | 7e67513 | 2008-04-28 02:13:00 -0700 | [diff] [blame] | 1173 | |
Jack Steiner | c627f9c | 2008-07-29 22:33:53 -0700 | [diff] [blame] | 1174 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
| 1175 | unsigned long size); |
Al Viro | 14f5ff5 | 2012-03-05 13:38:09 -0500 | [diff] [blame] | 1176 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | unsigned long size, struct zap_details *); |
Linus Torvalds | 4f74d2c | 2012-05-06 13:54:06 -0700 | [diff] [blame] | 1178 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
| 1179 | unsigned long start, unsigned long end); |
Matt Mackall | e647309 | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 1180 | |
| 1181 | /** |
| 1182 | * mm_walk - callbacks for walk_page_range |
Matt Mackall | e647309 | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 1183 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry |
Dave Hansen | 0331932 | 2011-03-22 16:32:56 -0700 | [diff] [blame] | 1184 | * this handler is required to be able to handle |
| 1185 | * pmd_trans_huge() pmds. They may simply choose to |
| 1186 | * split_huge_page() instead of handling it explicitly. |
Matt Mackall | e647309 | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 1187 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
| 1188 | * @pte_hole: if set, called for each hole at all levels |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1189 | * @hugetlb_entry: if set, called for each hugetlb entry |
Naoya Horiguchi | fafaa42 | 2015-02-11 15:27:37 -0800 | [diff] [blame] | 1190 | * @test_walk: caller specific callback function to determine whether |
James Morse | f7e2355 | 2016-10-07 16:58:36 -0700 | [diff] [blame] | 1191 | * we walk over the current vma or not. Returning 0 |
Naoya Horiguchi | fafaa42 | 2015-02-11 15:27:37 -0800 | [diff] [blame] | 1192 | * value means "do page table walk over the current vma," |
| 1193 | * and a negative one means "abort current page table walk |
James Morse | f7e2355 | 2016-10-07 16:58:36 -0700 | [diff] [blame] | 1194 | * right now." 1 means "skip the current vma." |
Naoya Horiguchi | fafaa42 | 2015-02-11 15:27:37 -0800 | [diff] [blame] | 1195 | * @mm: mm_struct representing the target process of page table walk |
| 1196 | * @vma: vma currently walked (NULL if walking outside vmas) |
| 1197 | * @private: private data for callbacks' usage |
Matt Mackall | e647309 | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 1198 | * |
Naoya Horiguchi | fafaa42 | 2015-02-11 15:27:37 -0800 | [diff] [blame] | 1199 | * (see the comment on walk_page_range() for more details) |
Matt Mackall | e647309 | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 1200 | */ |
| 1201 | struct mm_walk { |
Andrew Morton | 0f157a5 | 2013-05-07 16:18:10 -0700 | [diff] [blame] | 1202 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr, |
| 1203 | unsigned long next, struct mm_walk *walk); |
| 1204 | int (*pte_entry)(pte_t *pte, unsigned long addr, |
| 1205 | unsigned long next, struct mm_walk *walk); |
| 1206 | int (*pte_hole)(unsigned long addr, unsigned long next, |
| 1207 | struct mm_walk *walk); |
| 1208 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, |
| 1209 | unsigned long addr, unsigned long next, |
| 1210 | struct mm_walk *walk); |
Naoya Horiguchi | fafaa42 | 2015-02-11 15:27:37 -0800 | [diff] [blame] | 1211 | int (*test_walk)(unsigned long addr, unsigned long next, |
| 1212 | struct mm_walk *walk); |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1213 | struct mm_struct *mm; |
Naoya Horiguchi | fafaa42 | 2015-02-11 15:27:37 -0800 | [diff] [blame] | 1214 | struct vm_area_struct *vma; |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1215 | void *private; |
Matt Mackall | e647309 | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 1216 | }; |
| 1217 | |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1218 | int walk_page_range(unsigned long addr, unsigned long end, |
| 1219 | struct mm_walk *walk); |
Naoya Horiguchi | 900fc5f | 2015-02-11 15:27:40 -0800 | [diff] [blame] | 1220 | int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); |
Jan Beulich | 42b7772 | 2008-07-23 21:27:10 -0700 | [diff] [blame] | 1221 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
Hugh Dickins | 3bf5ee9 | 2005-04-19 13:29:16 -0700 | [diff] [blame] | 1222 | unsigned long end, unsigned long floor, unsigned long ceiling); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
| 1224 | struct vm_area_struct *vma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | void unmap_mapping_range(struct address_space *mapping, |
| 1226 | loff_t const holebegin, loff_t const holelen, int even_cows); |
Johannes Weiner | 3b6748e | 2009-06-16 15:32:35 -0700 | [diff] [blame] | 1227 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
| 1228 | unsigned long *pfn); |
venkatesh.pallipadi@intel.com | d87fe66 | 2008-12-19 13:47:27 -0800 | [diff] [blame] | 1229 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
| 1230 | unsigned int flags, unsigned long *prot, resource_size_t *phys); |
Rik van Riel | 28b2ee2 | 2008-07-23 21:27:05 -0700 | [diff] [blame] | 1231 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
| 1232 | void *buf, int len, int write); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | |
| 1234 | static inline void unmap_shared_mapping_range(struct address_space *mapping, |
| 1235 | loff_t const holebegin, loff_t const holelen) |
| 1236 | { |
| 1237 | unmap_mapping_range(mapping, holebegin, holelen, 0); |
| 1238 | } |
| 1239 | |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame] | 1240 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 1241 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
Jan Kara | 90a8020 | 2014-10-01 21:49:18 -0400 | [diff] [blame] | 1242 | void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to); |
Hugh Dickins | 623e3db | 2012-03-28 14:42:40 -0700 | [diff] [blame] | 1243 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
Nick Piggin | 750b498 | 2009-09-16 11:50:12 +0200 | [diff] [blame] | 1244 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
Andi Kleen | 2571873 | 2009-09-16 11:50:13 +0200 | [diff] [blame] | 1245 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
Wu Fengguang | 83f7866 | 2009-09-16 11:50:13 +0200 | [diff] [blame] | 1246 | int invalidate_inode_page(struct page *page); |
| 1247 | |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 1248 | #ifdef CONFIG_MMU |
Kirill A. Shutemov | dcddffd | 2016-07-26 15:25:18 -0700 | [diff] [blame] | 1249 | extern int handle_mm_fault(struct vm_area_struct *vma, unsigned long address, |
| 1250 | unsigned int flags); |
Peter Zijlstra | 5c723ba | 2011-07-27 12:17:11 +0200 | [diff] [blame] | 1251 | extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, |
Dominik Dingel | 4a9e1cd | 2016-01-15 16:57:04 -0800 | [diff] [blame] | 1252 | unsigned long address, unsigned int fault_flags, |
| 1253 | bool *unlocked); |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 1254 | #else |
Kirill A. Shutemov | dcddffd | 2016-07-26 15:25:18 -0700 | [diff] [blame] | 1255 | static inline int handle_mm_fault(struct vm_area_struct *vma, |
| 1256 | unsigned long address, unsigned int flags) |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 1257 | { |
| 1258 | /* should never happen if there's no MMU */ |
| 1259 | BUG(); |
| 1260 | return VM_FAULT_SIGBUS; |
| 1261 | } |
Peter Zijlstra | 5c723ba | 2011-07-27 12:17:11 +0200 | [diff] [blame] | 1262 | static inline int fixup_user_fault(struct task_struct *tsk, |
| 1263 | struct mm_struct *mm, unsigned long address, |
Dominik Dingel | 4a9e1cd | 2016-01-15 16:57:04 -0800 | [diff] [blame] | 1264 | unsigned int fault_flags, bool *unlocked) |
Peter Zijlstra | 5c723ba | 2011-07-27 12:17:11 +0200 | [diff] [blame] | 1265 | { |
| 1266 | /* should never happen if there's no MMU */ |
| 1267 | BUG(); |
| 1268 | return -EFAULT; |
| 1269 | } |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 1270 | #endif |
Nick Piggin | f33ea7f | 2005-08-03 20:24:01 +1000 | [diff] [blame] | 1271 | |
Lorenzo Stoakes | f307ab6 | 2016-10-13 01:20:20 +0100 | [diff] [blame] | 1272 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, |
| 1273 | unsigned int gup_flags); |
Stephen Wilson | 5ddd36b | 2011-03-13 15:49:20 -0400 | [diff] [blame] | 1274 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
Lorenzo Stoakes | 6347e8d | 2016-10-13 01:20:19 +0100 | [diff] [blame] | 1275 | void *buf, int len, unsigned int gup_flags); |
Eric W. Biederman | e71b4e0 | 2016-11-22 12:06:50 -0600 | [diff] [blame] | 1276 | extern int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, |
| 1277 | unsigned long addr, void *buf, int len, unsigned int gup_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | |
Dave Hansen | 1e98779 | 2016-02-12 13:01:54 -0800 | [diff] [blame] | 1279 | long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm, |
| 1280 | unsigned long start, unsigned long nr_pages, |
Lorenzo Stoakes | 9beae1e | 2016-10-13 01:20:17 +0100 | [diff] [blame] | 1281 | unsigned int gup_flags, struct page **pages, |
Dave Hansen | 1e98779 | 2016-02-12 13:01:54 -0800 | [diff] [blame] | 1282 | struct vm_area_struct **vmas); |
Ingo Molnar | c12d2da | 2016-04-04 10:24:58 +0200 | [diff] [blame] | 1283 | long get_user_pages(unsigned long start, unsigned long nr_pages, |
Lorenzo Stoakes | 768ae30 | 2016-10-13 01:20:16 +0100 | [diff] [blame] | 1284 | unsigned int gup_flags, struct page **pages, |
Dave Hansen | cde7014 | 2016-02-12 13:01:55 -0800 | [diff] [blame] | 1285 | struct vm_area_struct **vmas); |
Ingo Molnar | c12d2da | 2016-04-04 10:24:58 +0200 | [diff] [blame] | 1286 | long get_user_pages_locked(unsigned long start, unsigned long nr_pages, |
Lorenzo Stoakes | 3b91317 | 2016-10-13 01:20:14 +0100 | [diff] [blame] | 1287 | unsigned int gup_flags, struct page **pages, int *locked); |
Andrea Arcangeli | 0fd71a5 | 2015-02-11 15:27:20 -0800 | [diff] [blame] | 1288 | long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, |
| 1289 | unsigned long start, unsigned long nr_pages, |
Lorenzo Stoakes | d4944b0 | 2016-10-13 01:20:12 +0100 | [diff] [blame] | 1290 | struct page **pages, unsigned int gup_flags); |
Ingo Molnar | c12d2da | 2016-04-04 10:24:58 +0200 | [diff] [blame] | 1291 | long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
Lorenzo Stoakes | c164154 | 2016-10-13 01:20:13 +0100 | [diff] [blame] | 1292 | struct page **pages, unsigned int gup_flags); |
Nick Piggin | d2bf6be | 2009-06-16 15:31:39 -0700 | [diff] [blame] | 1293 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
| 1294 | struct page **pages); |
Jan Kara | 8025e5d | 2015-07-13 11:55:44 -0300 | [diff] [blame] | 1295 | |
| 1296 | /* Container for pinned pfns / pages */ |
| 1297 | struct frame_vector { |
| 1298 | unsigned int nr_allocated; /* Number of frames we have space for */ |
| 1299 | unsigned int nr_frames; /* Number of frames stored in ptrs array */ |
| 1300 | bool got_ref; /* Did we pin pages by getting page ref? */ |
| 1301 | bool is_pfns; /* Does array contain pages or pfns? */ |
| 1302 | void *ptrs[0]; /* Array of pinned pfns / pages. Use |
| 1303 | * pfns_vector_pages() or pfns_vector_pfns() |
| 1304 | * for access */ |
| 1305 | }; |
| 1306 | |
| 1307 | struct frame_vector *frame_vector_create(unsigned int nr_frames); |
| 1308 | void frame_vector_destroy(struct frame_vector *vec); |
| 1309 | int get_vaddr_frames(unsigned long start, unsigned int nr_pfns, |
Lorenzo Stoakes | 7f23b35 | 2016-10-13 01:20:15 +0100 | [diff] [blame] | 1310 | unsigned int gup_flags, struct frame_vector *vec); |
Jan Kara | 8025e5d | 2015-07-13 11:55:44 -0300 | [diff] [blame] | 1311 | void put_vaddr_frames(struct frame_vector *vec); |
| 1312 | int frame_vector_to_pages(struct frame_vector *vec); |
| 1313 | void frame_vector_to_pfns(struct frame_vector *vec); |
| 1314 | |
| 1315 | static inline unsigned int frame_vector_count(struct frame_vector *vec) |
| 1316 | { |
| 1317 | return vec->nr_frames; |
| 1318 | } |
| 1319 | |
| 1320 | static inline struct page **frame_vector_pages(struct frame_vector *vec) |
| 1321 | { |
| 1322 | if (vec->is_pfns) { |
| 1323 | int err = frame_vector_to_pages(vec); |
| 1324 | |
| 1325 | if (err) |
| 1326 | return ERR_PTR(err); |
| 1327 | } |
| 1328 | return (struct page **)(vec->ptrs); |
| 1329 | } |
| 1330 | |
| 1331 | static inline unsigned long *frame_vector_pfns(struct frame_vector *vec) |
| 1332 | { |
| 1333 | if (!vec->is_pfns) |
| 1334 | frame_vector_to_pfns(vec); |
| 1335 | return (unsigned long *)(vec->ptrs); |
| 1336 | } |
| 1337 | |
Mel Gorman | 18022c5 | 2012-07-31 16:44:51 -0700 | [diff] [blame] | 1338 | struct kvec; |
| 1339 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, |
| 1340 | struct page **pages); |
| 1341 | int get_kernel_page(unsigned long start, int write, struct page **pages); |
Hugh Dickins | f3e8fcc | 2009-09-21 17:03:25 -0700 | [diff] [blame] | 1342 | struct page *get_dump_page(unsigned long addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | |
David Howells | cf9a2ae | 2006-08-29 19:05:54 +0100 | [diff] [blame] | 1344 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 1345 | extern void do_invalidatepage(struct page *page, unsigned int offset, |
| 1346 | unsigned int length); |
David Howells | cf9a2ae | 2006-08-29 19:05:54 +0100 | [diff] [blame] | 1347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | int __set_page_dirty_nobuffers(struct page *page); |
Ken Chen | 7671932 | 2007-02-10 01:43:15 -0800 | [diff] [blame] | 1349 | int __set_page_dirty_no_writeback(struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | int redirty_page_for_writepage(struct writeback_control *wbc, |
| 1351 | struct page *page); |
Johannes Weiner | 62cccb8 | 2016-03-15 14:57:22 -0700 | [diff] [blame] | 1352 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
Greg Thelen | c4843a7 | 2015-05-22 17:13:16 -0400 | [diff] [blame] | 1353 | void account_page_cleaned(struct page *page, struct address_space *mapping, |
Johannes Weiner | 62cccb8 | 2016-03-15 14:57:22 -0700 | [diff] [blame] | 1354 | struct bdi_writeback *wb); |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 1355 | int set_page_dirty(struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | int set_page_dirty_lock(struct page *page); |
Tejun Heo | 11f81be | 2015-05-22 17:13:15 -0400 | [diff] [blame] | 1357 | void cancel_dirty_page(struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | int clear_page_dirty_for_io(struct page *page); |
Konstantin Khlebnikov | b9ea251 | 2015-04-14 15:45:27 -0700 | [diff] [blame] | 1359 | |
William Roberts | a909025 | 2014-02-11 10:11:59 -0800 | [diff] [blame] | 1360 | int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | |
Oleg Nesterov | b533062 | 2015-09-08 14:58:28 -0700 | [diff] [blame] | 1362 | static inline bool vma_is_anonymous(struct vm_area_struct *vma) |
| 1363 | { |
| 1364 | return !vma->vm_ops; |
| 1365 | } |
| 1366 | |
Andy Lutomirski | d17af50 | 2016-09-30 10:58:58 -0700 | [diff] [blame] | 1367 | int vma_is_stack_for_current(struct vm_area_struct *vma); |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1368 | |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 1369 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
| 1370 | unsigned long old_addr, struct vm_area_struct *new_vma, |
Michel Lespinasse | 38a7601 | 2012-10-08 16:31:50 -0700 | [diff] [blame] | 1371 | unsigned long new_addr, unsigned long len, |
| 1372 | bool need_rmap_locks); |
Peter Zijlstra | 7da4d64 | 2012-11-19 03:14:23 +0100 | [diff] [blame] | 1373 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
| 1374 | unsigned long end, pgprot_t newprot, |
Mel Gorman | 4b10e7d | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 1375 | int dirty_accountable, int prot_numa); |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 1376 | extern int mprotect_fixup(struct vm_area_struct *vma, |
| 1377 | struct vm_area_struct **pprev, unsigned long start, |
| 1378 | unsigned long end, unsigned long newflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | |
Nick Piggin | 21cc199 | 2008-07-25 19:45:22 -0700 | [diff] [blame] | 1380 | /* |
Peter Zijlstra | 465a454 | 2009-06-15 12:31:37 +0200 | [diff] [blame] | 1381 | * doesn't attempt to fault and will return short. |
| 1382 | */ |
| 1383 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, |
| 1384 | struct page **pages); |
KAMEZAWA Hiroyuki | d559db0 | 2010-03-05 13:41:39 -0800 | [diff] [blame] | 1385 | /* |
| 1386 | * per-process(per-mm_struct) statistics. |
| 1387 | */ |
Matt Fleming | 172703b | 2011-05-24 17:12:36 -0700 | [diff] [blame] | 1388 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
| 1389 | { |
Konstantin Khlebnikov | 69c9782 | 2012-03-21 16:33:49 -0700 | [diff] [blame] | 1390 | long val = atomic_long_read(&mm->rss_stat.count[member]); |
| 1391 | |
| 1392 | #ifdef SPLIT_RSS_COUNTING |
| 1393 | /* |
| 1394 | * counter is updated in asynchronous manner and may go to minus. |
| 1395 | * But it's never be expected number for users. |
| 1396 | */ |
| 1397 | if (val < 0) |
| 1398 | val = 0; |
Matt Fleming | 172703b | 2011-05-24 17:12:36 -0700 | [diff] [blame] | 1399 | #endif |
Konstantin Khlebnikov | 69c9782 | 2012-03-21 16:33:49 -0700 | [diff] [blame] | 1400 | return (unsigned long)val; |
| 1401 | } |
KAMEZAWA Hiroyuki | d559db0 | 2010-03-05 13:41:39 -0800 | [diff] [blame] | 1402 | |
| 1403 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) |
| 1404 | { |
| 1405 | atomic_long_add(value, &mm->rss_stat.count[member]); |
| 1406 | } |
| 1407 | |
| 1408 | static inline void inc_mm_counter(struct mm_struct *mm, int member) |
| 1409 | { |
| 1410 | atomic_long_inc(&mm->rss_stat.count[member]); |
| 1411 | } |
| 1412 | |
| 1413 | static inline void dec_mm_counter(struct mm_struct *mm, int member) |
| 1414 | { |
| 1415 | atomic_long_dec(&mm->rss_stat.count[member]); |
| 1416 | } |
| 1417 | |
Jerome Marchand | eca56ff | 2016-01-14 15:19:26 -0800 | [diff] [blame] | 1418 | /* Optimized variant when page is already known not to be PageAnon */ |
| 1419 | static inline int mm_counter_file(struct page *page) |
| 1420 | { |
| 1421 | if (PageSwapBacked(page)) |
| 1422 | return MM_SHMEMPAGES; |
| 1423 | return MM_FILEPAGES; |
| 1424 | } |
| 1425 | |
| 1426 | static inline int mm_counter(struct page *page) |
| 1427 | { |
| 1428 | if (PageAnon(page)) |
| 1429 | return MM_ANONPAGES; |
| 1430 | return mm_counter_file(page); |
| 1431 | } |
| 1432 | |
KAMEZAWA Hiroyuki | d559db0 | 2010-03-05 13:41:39 -0800 | [diff] [blame] | 1433 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
| 1434 | { |
| 1435 | return get_mm_counter(mm, MM_FILEPAGES) + |
Jerome Marchand | eca56ff | 2016-01-14 15:19:26 -0800 | [diff] [blame] | 1436 | get_mm_counter(mm, MM_ANONPAGES) + |
| 1437 | get_mm_counter(mm, MM_SHMEMPAGES); |
KAMEZAWA Hiroyuki | d559db0 | 2010-03-05 13:41:39 -0800 | [diff] [blame] | 1438 | } |
| 1439 | |
| 1440 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) |
| 1441 | { |
| 1442 | return max(mm->hiwater_rss, get_mm_rss(mm)); |
| 1443 | } |
| 1444 | |
| 1445 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) |
| 1446 | { |
| 1447 | return max(mm->hiwater_vm, mm->total_vm); |
| 1448 | } |
| 1449 | |
| 1450 | static inline void update_hiwater_rss(struct mm_struct *mm) |
| 1451 | { |
| 1452 | unsigned long _rss = get_mm_rss(mm); |
| 1453 | |
| 1454 | if ((mm)->hiwater_rss < _rss) |
| 1455 | (mm)->hiwater_rss = _rss; |
| 1456 | } |
| 1457 | |
| 1458 | static inline void update_hiwater_vm(struct mm_struct *mm) |
| 1459 | { |
| 1460 | if (mm->hiwater_vm < mm->total_vm) |
| 1461 | mm->hiwater_vm = mm->total_vm; |
| 1462 | } |
| 1463 | |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 1464 | static inline void reset_mm_hiwater_rss(struct mm_struct *mm) |
| 1465 | { |
| 1466 | mm->hiwater_rss = get_mm_rss(mm); |
| 1467 | } |
| 1468 | |
KAMEZAWA Hiroyuki | d559db0 | 2010-03-05 13:41:39 -0800 | [diff] [blame] | 1469 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
| 1470 | struct mm_struct *mm) |
| 1471 | { |
| 1472 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); |
| 1473 | |
| 1474 | if (*maxrss < hiwater_rss) |
| 1475 | *maxrss = hiwater_rss; |
| 1476 | } |
| 1477 | |
KAMEZAWA Hiroyuki | 53bddb4 | 2010-03-10 15:20:38 -0800 | [diff] [blame] | 1478 | #if defined(SPLIT_RSS_COUNTING) |
David Rientjes | 05af2e1 | 2012-03-21 16:34:13 -0700 | [diff] [blame] | 1479 | void sync_mm_rss(struct mm_struct *mm); |
KAMEZAWA Hiroyuki | 53bddb4 | 2010-03-10 15:20:38 -0800 | [diff] [blame] | 1480 | #else |
David Rientjes | 05af2e1 | 2012-03-21 16:34:13 -0700 | [diff] [blame] | 1481 | static inline void sync_mm_rss(struct mm_struct *mm) |
KAMEZAWA Hiroyuki | 53bddb4 | 2010-03-10 15:20:38 -0800 | [diff] [blame] | 1482 | { |
| 1483 | } |
| 1484 | #endif |
Peter Zijlstra | 465a454 | 2009-06-15 12:31:37 +0200 | [diff] [blame] | 1485 | |
Dan Williams | 3565fce | 2016-01-15 16:56:55 -0800 | [diff] [blame] | 1486 | #ifndef __HAVE_ARCH_PTE_DEVMAP |
| 1487 | static inline int pte_devmap(pte_t pte) |
| 1488 | { |
| 1489 | return 0; |
| 1490 | } |
| 1491 | #endif |
| 1492 | |
Andrea Arcangeli | 6d2329f | 2016-10-07 17:01:22 -0700 | [diff] [blame] | 1493 | int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot); |
Peter Zijlstra | d08b385 | 2006-09-25 23:30:57 -0700 | [diff] [blame] | 1494 | |
Namhyung Kim | 25ca1d6 | 2010-10-26 14:21:59 -0700 | [diff] [blame] | 1495 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
| 1496 | spinlock_t **ptl); |
| 1497 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, |
| 1498 | spinlock_t **ptl) |
| 1499 | { |
| 1500 | pte_t *ptep; |
| 1501 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); |
| 1502 | return ptep; |
| 1503 | } |
Linus Torvalds | c9cfcdd | 2005-11-29 14:03:14 -0800 | [diff] [blame] | 1504 | |
Nick Piggin | 5f22df0 | 2007-05-06 14:49:02 -0700 | [diff] [blame] | 1505 | #ifdef __PAGETABLE_PUD_FOLDED |
| 1506 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, |
| 1507 | unsigned long address) |
| 1508 | { |
| 1509 | return 0; |
| 1510 | } |
| 1511 | #else |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1512 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
Nick Piggin | 5f22df0 | 2007-05-06 14:49:02 -0700 | [diff] [blame] | 1513 | #endif |
| 1514 | |
Kirill A. Shutemov | 2d2f511 | 2015-02-12 14:59:59 -0800 | [diff] [blame] | 1515 | #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU) |
Nick Piggin | 5f22df0 | 2007-05-06 14:49:02 -0700 | [diff] [blame] | 1516 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
| 1517 | unsigned long address) |
| 1518 | { |
| 1519 | return 0; |
| 1520 | } |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 1521 | |
Kirill A. Shutemov | 2d2f511 | 2015-02-12 14:59:59 -0800 | [diff] [blame] | 1522 | static inline void mm_nr_pmds_init(struct mm_struct *mm) {} |
| 1523 | |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 1524 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm) |
| 1525 | { |
| 1526 | return 0; |
| 1527 | } |
| 1528 | |
| 1529 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) {} |
| 1530 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) {} |
| 1531 | |
Nick Piggin | 5f22df0 | 2007-05-06 14:49:02 -0700 | [diff] [blame] | 1532 | #else |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1533 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 1534 | |
Kirill A. Shutemov | 2d2f511 | 2015-02-12 14:59:59 -0800 | [diff] [blame] | 1535 | static inline void mm_nr_pmds_init(struct mm_struct *mm) |
| 1536 | { |
| 1537 | atomic_long_set(&mm->nr_pmds, 0); |
| 1538 | } |
| 1539 | |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 1540 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm) |
| 1541 | { |
| 1542 | return atomic_long_read(&mm->nr_pmds); |
| 1543 | } |
| 1544 | |
| 1545 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) |
| 1546 | { |
| 1547 | atomic_long_inc(&mm->nr_pmds); |
| 1548 | } |
| 1549 | |
| 1550 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) |
| 1551 | { |
| 1552 | atomic_long_dec(&mm->nr_pmds); |
| 1553 | } |
Nick Piggin | 5f22df0 | 2007-05-06 14:49:02 -0700 | [diff] [blame] | 1554 | #endif |
| 1555 | |
Kirill A. Shutemov | 3ed3a4f | 2016-03-17 14:19:11 -0700 | [diff] [blame] | 1556 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1557 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
| 1558 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | /* |
| 1560 | * The following ifdef needed to get the 4level-fixup.h header to work. |
| 1561 | * Remove it when 4level-fixup.h has been removed. |
| 1562 | */ |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1563 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
| 1565 | { |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1566 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
| 1567 | NULL: pud_offset(pgd, address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | } |
| 1569 | |
| 1570 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) |
| 1571 | { |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1572 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
| 1573 | NULL: pmd_offset(pud, address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | } |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1575 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
| 1576 | |
Kirill A. Shutemov | 57c1ffc | 2013-11-14 14:30:45 -0800 | [diff] [blame] | 1577 | #if USE_SPLIT_PTE_PTLOCKS |
Kirill A. Shutemov | 597d795 | 2013-12-20 13:35:58 +0200 | [diff] [blame] | 1578 | #if ALLOC_SPLIT_PTLOCKS |
Kirill A. Shutemov | b35f181 | 2014-01-21 15:49:07 -0800 | [diff] [blame] | 1579 | void __init ptlock_cache_init(void); |
Peter Zijlstra | 539edb5 | 2013-11-14 14:31:52 -0800 | [diff] [blame] | 1580 | extern bool ptlock_alloc(struct page *page); |
| 1581 | extern void ptlock_free(struct page *page); |
| 1582 | |
| 1583 | static inline spinlock_t *ptlock_ptr(struct page *page) |
| 1584 | { |
| 1585 | return page->ptl; |
| 1586 | } |
Kirill A. Shutemov | 597d795 | 2013-12-20 13:35:58 +0200 | [diff] [blame] | 1587 | #else /* ALLOC_SPLIT_PTLOCKS */ |
Kirill A. Shutemov | b35f181 | 2014-01-21 15:49:07 -0800 | [diff] [blame] | 1588 | static inline void ptlock_cache_init(void) |
| 1589 | { |
| 1590 | } |
| 1591 | |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1592 | static inline bool ptlock_alloc(struct page *page) |
| 1593 | { |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1594 | return true; |
| 1595 | } |
Peter Zijlstra | 539edb5 | 2013-11-14 14:31:52 -0800 | [diff] [blame] | 1596 | |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1597 | static inline void ptlock_free(struct page *page) |
| 1598 | { |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1599 | } |
| 1600 | |
| 1601 | static inline spinlock_t *ptlock_ptr(struct page *page) |
| 1602 | { |
Peter Zijlstra | 539edb5 | 2013-11-14 14:31:52 -0800 | [diff] [blame] | 1603 | return &page->ptl; |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1604 | } |
Kirill A. Shutemov | 597d795 | 2013-12-20 13:35:58 +0200 | [diff] [blame] | 1605 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1606 | |
| 1607 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| 1608 | { |
| 1609 | return ptlock_ptr(pmd_page(*pmd)); |
| 1610 | } |
| 1611 | |
| 1612 | static inline bool ptlock_init(struct page *page) |
| 1613 | { |
| 1614 | /* |
| 1615 | * prep_new_page() initialize page->private (and therefore page->ptl) |
| 1616 | * with 0. Make sure nobody took it in use in between. |
| 1617 | * |
| 1618 | * It can happen if arch try to use slab for page table allocation: |
Kirill A. Shutemov | 1d798ca | 2015-11-06 16:29:54 -0800 | [diff] [blame] | 1619 | * slab code uses page->slab_cache, which share storage with page->ptl. |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1620 | */ |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 1621 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1622 | if (!ptlock_alloc(page)) |
| 1623 | return false; |
| 1624 | spin_lock_init(ptlock_ptr(page)); |
| 1625 | return true; |
| 1626 | } |
| 1627 | |
| 1628 | /* Reset page->mapping so free_pages_check won't complain. */ |
| 1629 | static inline void pte_lock_deinit(struct page *page) |
| 1630 | { |
| 1631 | page->mapping = NULL; |
| 1632 | ptlock_free(page); |
| 1633 | } |
| 1634 | |
Kirill A. Shutemov | 57c1ffc | 2013-11-14 14:30:45 -0800 | [diff] [blame] | 1635 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 1636 | /* |
| 1637 | * We use mm->page_table_lock to guard all pagetable pages of the mm. |
| 1638 | */ |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1639 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| 1640 | { |
| 1641 | return &mm->page_table_lock; |
| 1642 | } |
Kirill A. Shutemov | b35f181 | 2014-01-21 15:49:07 -0800 | [diff] [blame] | 1643 | static inline void ptlock_cache_init(void) {} |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1644 | static inline bool ptlock_init(struct page *page) { return true; } |
| 1645 | static inline void pte_lock_deinit(struct page *page) {} |
Kirill A. Shutemov | 57c1ffc | 2013-11-14 14:30:45 -0800 | [diff] [blame] | 1646 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 1647 | |
Kirill A. Shutemov | b35f181 | 2014-01-21 15:49:07 -0800 | [diff] [blame] | 1648 | static inline void pgtable_init(void) |
| 1649 | { |
| 1650 | ptlock_cache_init(); |
| 1651 | pgtable_cache_init(); |
| 1652 | } |
| 1653 | |
Kirill A. Shutemov | 390f44e | 2013-11-14 14:31:20 -0800 | [diff] [blame] | 1654 | static inline bool pgtable_page_ctor(struct page *page) |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 1655 | { |
Vladimir Davydov | 706874e | 2015-11-05 18:49:27 -0800 | [diff] [blame] | 1656 | if (!ptlock_init(page)) |
| 1657 | return false; |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 1658 | inc_zone_page_state(page, NR_PAGETABLE); |
Vladimir Davydov | 706874e | 2015-11-05 18:49:27 -0800 | [diff] [blame] | 1659 | return true; |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 1660 | } |
| 1661 | |
| 1662 | static inline void pgtable_page_dtor(struct page *page) |
| 1663 | { |
| 1664 | pte_lock_deinit(page); |
| 1665 | dec_zone_page_state(page, NR_PAGETABLE); |
| 1666 | } |
| 1667 | |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 1668 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
| 1669 | ({ \ |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 1670 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 1671 | pte_t *__pte = pte_offset_map(pmd, address); \ |
| 1672 | *(ptlp) = __ptl; \ |
| 1673 | spin_lock(__ptl); \ |
| 1674 | __pte; \ |
| 1675 | }) |
| 1676 | |
| 1677 | #define pte_unmap_unlock(pte, ptl) do { \ |
| 1678 | spin_unlock(ptl); \ |
| 1679 | pte_unmap(pte); \ |
| 1680 | } while (0) |
| 1681 | |
Kirill A. Shutemov | 3ed3a4f | 2016-03-17 14:19:11 -0700 | [diff] [blame] | 1682 | #define pte_alloc(mm, pmd, address) \ |
| 1683 | (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd, address)) |
| 1684 | |
| 1685 | #define pte_alloc_map(mm, pmd, address) \ |
| 1686 | (pte_alloc(mm, pmd, address) ? NULL : pte_offset_map(pmd, address)) |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1687 | |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 1688 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
Kirill A. Shutemov | 3ed3a4f | 2016-03-17 14:19:11 -0700 | [diff] [blame] | 1689 | (pte_alloc(mm, pmd, address) ? \ |
| 1690 | NULL : pte_offset_map_lock(mm, pmd, address, ptlp)) |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 1691 | |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1692 | #define pte_alloc_kernel(pmd, address) \ |
Andrea Arcangeli | 8ac1f83 | 2011-01-13 15:46:43 -0800 | [diff] [blame] | 1693 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1694 | NULL: pte_offset_kernel(pmd, address)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | |
Kirill A. Shutemov | e009bb3 | 2013-11-14 14:31:07 -0800 | [diff] [blame] | 1696 | #if USE_SPLIT_PMD_PTLOCKS |
| 1697 | |
Martin Schwidefsky | 634391a | 2014-02-13 13:53:33 +0100 | [diff] [blame] | 1698 | static struct page *pmd_to_page(pmd_t *pmd) |
| 1699 | { |
| 1700 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); |
| 1701 | return virt_to_page((void *)((unsigned long) pmd & mask)); |
| 1702 | } |
| 1703 | |
Kirill A. Shutemov | e009bb3 | 2013-11-14 14:31:07 -0800 | [diff] [blame] | 1704 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| 1705 | { |
Martin Schwidefsky | 634391a | 2014-02-13 13:53:33 +0100 | [diff] [blame] | 1706 | return ptlock_ptr(pmd_to_page(pmd)); |
Kirill A. Shutemov | e009bb3 | 2013-11-14 14:31:07 -0800 | [diff] [blame] | 1707 | } |
| 1708 | |
| 1709 | static inline bool pgtable_pmd_page_ctor(struct page *page) |
| 1710 | { |
Kirill A. Shutemov | e009bb3 | 2013-11-14 14:31:07 -0800 | [diff] [blame] | 1711 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 1712 | page->pmd_huge_pte = NULL; |
| 1713 | #endif |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1714 | return ptlock_init(page); |
Kirill A. Shutemov | e009bb3 | 2013-11-14 14:31:07 -0800 | [diff] [blame] | 1715 | } |
| 1716 | |
| 1717 | static inline void pgtable_pmd_page_dtor(struct page *page) |
| 1718 | { |
| 1719 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 1720 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
Kirill A. Shutemov | e009bb3 | 2013-11-14 14:31:07 -0800 | [diff] [blame] | 1721 | #endif |
Kirill A. Shutemov | 49076ec | 2013-11-14 14:31:51 -0800 | [diff] [blame] | 1722 | ptlock_free(page); |
Kirill A. Shutemov | e009bb3 | 2013-11-14 14:31:07 -0800 | [diff] [blame] | 1723 | } |
| 1724 | |
Martin Schwidefsky | 634391a | 2014-02-13 13:53:33 +0100 | [diff] [blame] | 1725 | #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte) |
Kirill A. Shutemov | e009bb3 | 2013-11-14 14:31:07 -0800 | [diff] [blame] | 1726 | |
| 1727 | #else |
| 1728 | |
Kirill A. Shutemov | 9a86cb7 | 2013-11-14 14:30:51 -0800 | [diff] [blame] | 1729 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| 1730 | { |
| 1731 | return &mm->page_table_lock; |
| 1732 | } |
| 1733 | |
Kirill A. Shutemov | e009bb3 | 2013-11-14 14:31:07 -0800 | [diff] [blame] | 1734 | static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } |
| 1735 | static inline void pgtable_pmd_page_dtor(struct page *page) {} |
| 1736 | |
Kirill A. Shutemov | c389a25 | 2013-11-14 14:30:59 -0800 | [diff] [blame] | 1737 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
Kirill A. Shutemov | 9a86cb7 | 2013-11-14 14:30:51 -0800 | [diff] [blame] | 1738 | |
Kirill A. Shutemov | e009bb3 | 2013-11-14 14:31:07 -0800 | [diff] [blame] | 1739 | #endif |
| 1740 | |
Kirill A. Shutemov | 9a86cb7 | 2013-11-14 14:30:51 -0800 | [diff] [blame] | 1741 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
| 1742 | { |
| 1743 | spinlock_t *ptl = pmd_lockptr(mm, pmd); |
| 1744 | spin_lock(ptl); |
| 1745 | return ptl; |
| 1746 | } |
| 1747 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | extern void free_area_init(unsigned long * zones_size); |
Johannes Weiner | 9109fb7 | 2008-07-23 21:27:20 -0700 | [diff] [blame] | 1749 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
| 1750 | unsigned long zone_start_pfn, unsigned long *zholes_size); |
David Howells | 49a7f04 | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 1751 | extern void free_initmem(void); |
| 1752 | |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 1753 | /* |
| 1754 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) |
| 1755 | * into the buddy system. The freed pages will be poisoned with pattern |
Jiang Liu | dbe67df | 2013-07-03 15:02:51 -0700 | [diff] [blame] | 1756 | * "poison" if it's within range [0, UCHAR_MAX]. |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 1757 | * Return pages freed into the buddy system. |
| 1758 | */ |
Jiang Liu | 1119969 | 2013-07-03 15:02:48 -0700 | [diff] [blame] | 1759 | extern unsigned long free_reserved_area(void *start, void *end, |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 1760 | int poison, char *s); |
Jiang Liu | c3d5f5f | 2013-07-03 15:03:14 -0700 | [diff] [blame] | 1761 | |
Jiang Liu | cfa11e0 | 2013-04-29 15:07:00 -0700 | [diff] [blame] | 1762 | #ifdef CONFIG_HIGHMEM |
| 1763 | /* |
| 1764 | * Free a highmem page into the buddy system, adjusting totalhigh_pages |
| 1765 | * and totalram_pages. |
| 1766 | */ |
| 1767 | extern void free_highmem_page(struct page *page); |
| 1768 | #endif |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 1769 | |
Jiang Liu | c3d5f5f | 2013-07-03 15:03:14 -0700 | [diff] [blame] | 1770 | extern void adjust_managed_page_count(struct page *page, long count); |
Jiang Liu | 7ee3d4e | 2013-07-03 15:03:41 -0700 | [diff] [blame] | 1771 | extern void mem_init_print_info(const char *str); |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 1772 | |
Stefan Bader | 4b50bcc | 2016-05-20 16:58:38 -0700 | [diff] [blame] | 1773 | extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end); |
Nathan Zimmer | 92923ca | 2015-06-30 14:56:48 -0700 | [diff] [blame] | 1774 | |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 1775 | /* Free the reserved page into the buddy system, so it gets managed. */ |
| 1776 | static inline void __free_reserved_page(struct page *page) |
| 1777 | { |
| 1778 | ClearPageReserved(page); |
| 1779 | init_page_count(page); |
| 1780 | __free_page(page); |
| 1781 | } |
| 1782 | |
| 1783 | static inline void free_reserved_page(struct page *page) |
| 1784 | { |
| 1785 | __free_reserved_page(page); |
| 1786 | adjust_managed_page_count(page, 1); |
| 1787 | } |
| 1788 | |
| 1789 | static inline void mark_page_reserved(struct page *page) |
| 1790 | { |
| 1791 | SetPageReserved(page); |
| 1792 | adjust_managed_page_count(page, -1); |
| 1793 | } |
| 1794 | |
| 1795 | /* |
| 1796 | * Default method to free all the __init memory into the buddy system. |
Jiang Liu | dbe67df | 2013-07-03 15:02:51 -0700 | [diff] [blame] | 1797 | * The freed pages will be poisoned with pattern "poison" if it's within |
| 1798 | * range [0, UCHAR_MAX]. |
| 1799 | * Return pages freed into the buddy system. |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 1800 | */ |
| 1801 | static inline unsigned long free_initmem_default(int poison) |
| 1802 | { |
| 1803 | extern char __init_begin[], __init_end[]; |
| 1804 | |
Jiang Liu | 1119969 | 2013-07-03 15:02:48 -0700 | [diff] [blame] | 1805 | return free_reserved_area(&__init_begin, &__init_end, |
Jiang Liu | 69afade | 2013-04-29 15:06:21 -0700 | [diff] [blame] | 1806 | poison, "unused kernel"); |
| 1807 | } |
| 1808 | |
Jiang Liu | 7ee3d4e | 2013-07-03 15:03:41 -0700 | [diff] [blame] | 1809 | static inline unsigned long get_num_physpages(void) |
| 1810 | { |
| 1811 | int nid; |
| 1812 | unsigned long phys_pages = 0; |
| 1813 | |
| 1814 | for_each_online_node(nid) |
| 1815 | phys_pages += node_present_pages(nid); |
| 1816 | |
| 1817 | return phys_pages; |
| 1818 | } |
| 1819 | |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 1820 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1821 | /* |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 1822 | * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1823 | * zones, allocate the backing mem_map and account for memory holes in a more |
| 1824 | * architecture independent manner. This is a substitute for creating the |
| 1825 | * zone_sizes[] and zholes_size[] arrays and passing them to |
| 1826 | * free_area_init_node() |
| 1827 | * |
| 1828 | * An architecture is expected to register range of page frames backed by |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 1829 | * physical memory with memblock_add[_node]() before calling |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1830 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
| 1831 | * usage, an architecture is expected to do something like |
| 1832 | * |
| 1833 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, |
| 1834 | * max_highmem_pfn}; |
| 1835 | * for_each_valid_physical_page_range() |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 1836 | * memblock_add_node(base, size, nid) |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1837 | * free_area_init_nodes(max_zone_pfns); |
| 1838 | * |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 1839 | * free_bootmem_with_active_regions() calls free_bootmem_node() for each |
| 1840 | * registered physical page range. Similarly |
| 1841 | * sparse_memory_present_with_active_regions() calls memory_present() for |
| 1842 | * each range when SPARSEMEM is enabled. |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1843 | * |
| 1844 | * See mm/page_alloc.c for more information on each function exposed by |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 1845 | * CONFIG_HAVE_MEMBLOCK_NODE_MAP. |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1846 | */ |
| 1847 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); |
Tejun Heo | 1e01979 | 2011-07-12 09:45:34 +0200 | [diff] [blame] | 1848 | unsigned long node_map_pfn_alignment(void); |
Yinghai Lu | 3299625 | 2009-12-15 17:59:02 -0800 | [diff] [blame] | 1849 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
| 1850 | unsigned long end_pfn); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1851 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
| 1852 | unsigned long end_pfn); |
| 1853 | extern void get_pfn_range_for_nid(unsigned int nid, |
| 1854 | unsigned long *start_pfn, unsigned long *end_pfn); |
| 1855 | extern unsigned long find_min_pfn_with_active_regions(void); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1856 | extern void free_bootmem_with_active_regions(int nid, |
| 1857 | unsigned long max_low_pfn); |
| 1858 | extern void sparse_memory_present_with_active_regions(int nid); |
KAMEZAWA Hiroyuki | f2dbcfa | 2009-02-18 14:48:32 -0800 | [diff] [blame] | 1859 | |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 1860 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
Tejun Heo | 5dfe866 | 2011-07-14 09:46:10 +0200 | [diff] [blame] | 1861 | |
Tejun Heo | 0ee332c | 2011-12-08 10:22:09 -0800 | [diff] [blame] | 1862 | #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ |
KAMEZAWA Hiroyuki | f2dbcfa | 2009-02-18 14:48:32 -0800 | [diff] [blame] | 1863 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) |
Mel Gorman | 8a942fd | 2015-06-30 14:56:55 -0700 | [diff] [blame] | 1864 | static inline int __early_pfn_to_nid(unsigned long pfn, |
| 1865 | struct mminit_pfnnid_cache *state) |
KAMEZAWA Hiroyuki | f2dbcfa | 2009-02-18 14:48:32 -0800 | [diff] [blame] | 1866 | { |
| 1867 | return 0; |
| 1868 | } |
| 1869 | #else |
| 1870 | /* please see mm/page_alloc.c */ |
| 1871 | extern int __meminit early_pfn_to_nid(unsigned long pfn); |
KAMEZAWA Hiroyuki | f2dbcfa | 2009-02-18 14:48:32 -0800 | [diff] [blame] | 1872 | /* there is a per-arch backend function. */ |
Mel Gorman | 8a942fd | 2015-06-30 14:56:55 -0700 | [diff] [blame] | 1873 | extern int __meminit __early_pfn_to_nid(unsigned long pfn, |
| 1874 | struct mminit_pfnnid_cache *state); |
KAMEZAWA Hiroyuki | f2dbcfa | 2009-02-18 14:48:32 -0800 | [diff] [blame] | 1875 | #endif |
| 1876 | |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 1877 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
Dave Hansen | a2f3aa02 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 1878 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
| 1879 | unsigned long, enum memmap_context); |
Minchan Kim | bc75d33 | 2009-06-16 15:32:48 -0700 | [diff] [blame] | 1880 | extern void setup_per_zone_wmarks(void); |
KOSAKI Motohiro | 1b79acc | 2011-05-24 17:11:32 -0700 | [diff] [blame] | 1881 | extern int __meminit init_per_zone_wmark_min(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | extern void mem_init(void); |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1883 | extern void __init mmap_init(void); |
David Rientjes | b2b755b | 2011-03-24 15:18:15 -0700 | [diff] [blame] | 1884 | extern void show_mem(unsigned int flags); |
Igor Redko | d02bd27 | 2016-03-17 14:19:05 -0700 | [diff] [blame] | 1885 | extern long si_mem_available(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | extern void si_meminfo(struct sysinfo * val); |
| 1887 | extern void si_meminfo_node(struct sysinfo *val, int nid); |
Srikar Dronamraju | f6f34b4 | 2016-10-07 16:59:15 -0700 | [diff] [blame] | 1888 | #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES |
| 1889 | extern unsigned long arch_reserved_kernel_pages(void); |
| 1890 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | |
Michal Hocko | 7877cdc | 2016-10-07 17:01:55 -0700 | [diff] [blame] | 1892 | extern __printf(2, 3) |
| 1893 | void warn_alloc(gfp_t gfp_mask, const char *fmt, ...); |
Dave Hansen | a238ab5 | 2011-05-24 17:12:16 -0700 | [diff] [blame] | 1894 | |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 1895 | extern void setup_per_cpu_pageset(void); |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 1896 | |
Shaohua Li | 112067f | 2009-09-21 17:01:16 -0700 | [diff] [blame] | 1897 | extern void zone_pcp_update(struct zone *zone); |
Jiang Liu | 340175b | 2012-07-31 16:43:32 -0700 | [diff] [blame] | 1898 | extern void zone_pcp_reset(struct zone *zone); |
Shaohua Li | 112067f | 2009-09-21 17:01:16 -0700 | [diff] [blame] | 1899 | |
Paul Szabo | 75f7ad8 | 2013-02-22 16:34:42 -0800 | [diff] [blame] | 1900 | /* page_alloc.c */ |
| 1901 | extern int min_free_kbytes; |
Johannes Weiner | 795ae7a | 2016-03-17 14:19:14 -0700 | [diff] [blame] | 1902 | extern int watermark_scale_factor; |
Paul Szabo | 75f7ad8 | 2013-02-22 16:34:42 -0800 | [diff] [blame] | 1903 | |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1904 | /* nommu.c */ |
David Howells | 33e5d769 | 2009-04-02 16:56:32 -0700 | [diff] [blame] | 1905 | extern atomic_long_t mmap_pages_allocated; |
David Howells | 7e66087 | 2010-01-15 17:01:39 -0800 | [diff] [blame] | 1906 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1907 | |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 1908 | /* interval_tree.c */ |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 1909 | void vma_interval_tree_insert(struct vm_area_struct *node, |
| 1910 | struct rb_root *root); |
Michel Lespinasse | 9826a51 | 2012-10-08 16:31:35 -0700 | [diff] [blame] | 1911 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
| 1912 | struct vm_area_struct *prev, |
| 1913 | struct rb_root *root); |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 1914 | void vma_interval_tree_remove(struct vm_area_struct *node, |
| 1915 | struct rb_root *root); |
| 1916 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root, |
| 1917 | unsigned long start, unsigned long last); |
| 1918 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, |
| 1919 | unsigned long start, unsigned long last); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 1921 | #define vma_interval_tree_foreach(vma, root, start, last) \ |
| 1922 | for (vma = vma_interval_tree_iter_first(root, start, last); \ |
| 1923 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | |
Michel Lespinasse | bf181b9 | 2012-10-08 16:31:39 -0700 | [diff] [blame] | 1925 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
| 1926 | struct rb_root *root); |
| 1927 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, |
| 1928 | struct rb_root *root); |
| 1929 | struct anon_vma_chain *anon_vma_interval_tree_iter_first( |
| 1930 | struct rb_root *root, unsigned long start, unsigned long last); |
| 1931 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( |
| 1932 | struct anon_vma_chain *node, unsigned long start, unsigned long last); |
Michel Lespinasse | ed8ea81 | 2012-10-08 16:31:45 -0700 | [diff] [blame] | 1933 | #ifdef CONFIG_DEBUG_VM_RB |
| 1934 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); |
| 1935 | #endif |
Michel Lespinasse | bf181b9 | 2012-10-08 16:31:39 -0700 | [diff] [blame] | 1936 | |
| 1937 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ |
| 1938 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ |
| 1939 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) |
| 1940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | /* mmap.c */ |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1942 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
Andrea Arcangeli | e86f15e | 2016-10-07 17:01:28 -0700 | [diff] [blame] | 1943 | extern int __vma_adjust(struct vm_area_struct *vma, unsigned long start, |
| 1944 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert, |
| 1945 | struct vm_area_struct *expand); |
| 1946 | static inline int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
| 1947 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert) |
| 1948 | { |
| 1949 | return __vma_adjust(vma, start, end, pgoff, insert, NULL); |
| 1950 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | extern struct vm_area_struct *vma_merge(struct mm_struct *, |
| 1952 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, |
| 1953 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, |
Colin Cross | 3e4578f | 2015-10-27 16:42:08 -0700 | [diff] [blame] | 1954 | struct mempolicy *, struct vm_userfaultfd_ctx, const char __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
| 1956 | extern int split_vma(struct mm_struct *, |
| 1957 | struct vm_area_struct *, unsigned long addr, int new_below); |
| 1958 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
| 1959 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, |
| 1960 | struct rb_node **, struct rb_node *); |
Hugh Dickins | a8fb561 | 2005-10-29 18:15:57 -0700 | [diff] [blame] | 1961 | extern void unlink_file_vma(struct vm_area_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
Michel Lespinasse | 38a7601 | 2012-10-08 16:31:50 -0700 | [diff] [blame] | 1963 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
| 1964 | bool *need_rmap_locks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | extern void exit_mmap(struct mm_struct *); |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1966 | |
Cyrill Gorcunov | 9c59902 | 2014-10-09 15:27:29 -0700 | [diff] [blame] | 1967 | static inline int check_data_rlimit(unsigned long rlim, |
| 1968 | unsigned long new, |
| 1969 | unsigned long start, |
| 1970 | unsigned long end_data, |
| 1971 | unsigned long start_data) |
| 1972 | { |
| 1973 | if (rlim < RLIM_INFINITY) { |
| 1974 | if (((new - start) + (end_data - start_data)) > rlim) |
| 1975 | return -ENOSPC; |
| 1976 | } |
| 1977 | |
| 1978 | return 0; |
| 1979 | } |
| 1980 | |
Andrea Arcangeli | 7906d00 | 2008-07-28 15:46:26 -0700 | [diff] [blame] | 1981 | extern int mm_take_all_locks(struct mm_struct *mm); |
| 1982 | extern void mm_drop_all_locks(struct mm_struct *mm); |
| 1983 | |
Jiri Slaby | 3864601 | 2011-05-26 16:25:46 -0700 | [diff] [blame] | 1984 | extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
| 1985 | extern struct file *get_mm_exe_file(struct mm_struct *mm); |
Mateusz Guzik | cd81a91 | 2016-08-23 16:20:38 +0200 | [diff] [blame] | 1986 | extern struct file *get_task_exe_file(struct task_struct *task); |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1987 | |
Konstantin Khlebnikov | 8463833 | 2016-01-14 15:22:07 -0800 | [diff] [blame] | 1988 | extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages); |
| 1989 | extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages); |
| 1990 | |
Dmitry Safonov | 2eefd87 | 2016-09-05 16:33:05 +0300 | [diff] [blame] | 1991 | extern bool vma_is_special_mapping(const struct vm_area_struct *vma, |
| 1992 | const struct vm_special_mapping *sm); |
Stefani Seibold | 3935ed6 | 2014-03-17 23:22:02 +0100 | [diff] [blame] | 1993 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
| 1994 | unsigned long addr, unsigned long len, |
Andy Lutomirski | a62c34b | 2014-05-19 15:58:33 -0700 | [diff] [blame] | 1995 | unsigned long flags, |
| 1996 | const struct vm_special_mapping *spec); |
| 1997 | /* This is an obsolete alternative to _install_special_mapping. */ |
Roland McGrath | fa5dc22 | 2007-02-08 14:20:41 -0800 | [diff] [blame] | 1998 | extern int install_special_mapping(struct mm_struct *mm, |
| 1999 | unsigned long addr, unsigned long len, |
| 2000 | unsigned long flags, struct page **pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | |
| 2002 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| 2003 | |
Miklos Szeredi | 0165ab4 | 2007-07-15 23:38:26 -0700 | [diff] [blame] | 2004 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
Michel Lespinasse | c22c0d6 | 2013-02-22 16:32:43 -0800 | [diff] [blame] | 2005 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff); |
Oleg Nesterov | 1fcfd8d | 2015-09-09 15:39:29 -0700 | [diff] [blame] | 2006 | extern unsigned long do_mmap(struct file *file, unsigned long addr, |
Michel Lespinasse | bebeb3d | 2013-02-22 16:32:37 -0800 | [diff] [blame] | 2007 | unsigned long len, unsigned long prot, unsigned long flags, |
Oleg Nesterov | 1fcfd8d | 2015-09-09 15:39:29 -0700 | [diff] [blame] | 2008 | vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
| 2010 | |
Oleg Nesterov | 1fcfd8d | 2015-09-09 15:39:29 -0700 | [diff] [blame] | 2011 | static inline unsigned long |
| 2012 | do_mmap_pgoff(struct file *file, unsigned long addr, |
| 2013 | unsigned long len, unsigned long prot, unsigned long flags, |
| 2014 | unsigned long pgoff, unsigned long *populate) |
| 2015 | { |
| 2016 | return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate); |
| 2017 | } |
| 2018 | |
Michel Lespinasse | bebeb3d | 2013-02-22 16:32:37 -0800 | [diff] [blame] | 2019 | #ifdef CONFIG_MMU |
| 2020 | extern int __mm_populate(unsigned long addr, unsigned long len, |
| 2021 | int ignore_errors); |
| 2022 | static inline void mm_populate(unsigned long addr, unsigned long len) |
| 2023 | { |
| 2024 | /* Ignore errors */ |
| 2025 | (void) __mm_populate(addr, len, 1); |
| 2026 | } |
| 2027 | #else |
| 2028 | static inline void mm_populate(unsigned long addr, unsigned long len) {} |
| 2029 | #endif |
| 2030 | |
Linus Torvalds | e4eb1ff | 2012-04-20 15:35:40 -0700 | [diff] [blame] | 2031 | /* These take the mm semaphore themselves */ |
Linus Torvalds | 5d22fc2 | 2016-05-27 15:57:31 -0700 | [diff] [blame] | 2032 | extern int __must_check vm_brk(unsigned long, unsigned long); |
Al Viro | bfce281 | 2012-04-20 21:57:04 -0400 | [diff] [blame] | 2033 | extern int vm_munmap(unsigned long, size_t); |
Michal Hocko | 9fbeb5a | 2016-05-23 16:25:30 -0700 | [diff] [blame] | 2034 | extern unsigned long __must_check vm_mmap(struct file *, unsigned long, |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 2035 | unsigned long, unsigned long, |
| 2036 | unsigned long, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | |
Michel Lespinasse | db4fbfb | 2012-12-11 16:01:49 -0800 | [diff] [blame] | 2038 | struct vm_unmapped_area_info { |
| 2039 | #define VM_UNMAPPED_AREA_TOPDOWN 1 |
| 2040 | unsigned long flags; |
| 2041 | unsigned long length; |
| 2042 | unsigned long low_limit; |
| 2043 | unsigned long high_limit; |
| 2044 | unsigned long align_mask; |
| 2045 | unsigned long align_offset; |
| 2046 | }; |
| 2047 | |
| 2048 | extern unsigned long unmapped_area(struct vm_unmapped_area_info *info); |
| 2049 | extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); |
| 2050 | |
| 2051 | /* |
| 2052 | * Search for an unmapped address range. |
| 2053 | * |
| 2054 | * We are looking for a range that: |
| 2055 | * - does not intersect with any VMA; |
| 2056 | * - is contained within the [low_limit, high_limit) interval; |
| 2057 | * - is at least the desired size. |
| 2058 | * - satisfies (begin_addr & align_mask) == (align_offset & align_mask) |
| 2059 | */ |
| 2060 | static inline unsigned long |
| 2061 | vm_unmapped_area(struct vm_unmapped_area_info *info) |
| 2062 | { |
Borislav Petkov | cdd7875 | 2015-04-15 16:14:47 -0700 | [diff] [blame] | 2063 | if (info->flags & VM_UNMAPPED_AREA_TOPDOWN) |
Michel Lespinasse | db4fbfb | 2012-12-11 16:01:49 -0800 | [diff] [blame] | 2064 | return unmapped_area_topdown(info); |
Borislav Petkov | cdd7875 | 2015-04-15 16:14:47 -0700 | [diff] [blame] | 2065 | else |
| 2066 | return unmapped_area(info); |
Michel Lespinasse | db4fbfb | 2012-12-11 16:01:49 -0800 | [diff] [blame] | 2067 | } |
| 2068 | |
Hugh Dickins | 85821aa | 2011-07-25 17:12:23 -0700 | [diff] [blame] | 2069 | /* truncate.c */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | extern void truncate_inode_pages(struct address_space *, loff_t); |
Hans Reiser | d733907 | 2006-01-06 00:10:36 -0800 | [diff] [blame] | 2071 | extern void truncate_inode_pages_range(struct address_space *, |
| 2072 | loff_t lstart, loff_t lend); |
Johannes Weiner | 91b0abe | 2014-04-03 14:47:49 -0700 | [diff] [blame] | 2073 | extern void truncate_inode_pages_final(struct address_space *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2074 | |
| 2075 | /* generic vm_area_ops exported for stackable file systems */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 2076 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
Kirill A. Shutemov | bae473a | 2016-07-26 15:25:20 -0700 | [diff] [blame] | 2077 | extern void filemap_map_pages(struct fault_env *fe, |
| 2078 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
Jan Kara | 4fcf1c6 | 2012-06-12 16:20:29 +0200 | [diff] [blame] | 2079 | extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2080 | |
| 2081 | /* mm/page-writeback.c */ |
| 2082 | int write_one_page(struct page *page, int wait); |
Nick Piggin | 1cf6e7d | 2009-02-18 14:48:18 -0800 | [diff] [blame] | 2083 | void task_dirty_inc(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | |
| 2085 | /* readahead.c */ |
Lee Susman | 001f314 | 2013-10-08 09:47:59 +0300 | [diff] [blame] | 2086 | #define VM_MAX_READAHEAD 512 /* kbytes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
Andrew Morton | 7361f4d | 2005-11-07 00:59:28 -0800 | [diff] [blame] | 2090 | pgoff_t offset, unsigned long nr_to_read); |
Rusty Russell | cf914a7 | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 2091 | |
| 2092 | void page_cache_sync_readahead(struct address_space *mapping, |
| 2093 | struct file_ra_state *ra, |
| 2094 | struct file *filp, |
| 2095 | pgoff_t offset, |
| 2096 | unsigned long size); |
| 2097 | |
| 2098 | void page_cache_async_readahead(struct address_space *mapping, |
| 2099 | struct file_ra_state *ra, |
| 2100 | struct file *filp, |
| 2101 | struct page *pg, |
| 2102 | pgoff_t offset, |
| 2103 | unsigned long size); |
| 2104 | |
Hugh Dickins | cfc0eb40 | 2017-06-19 04:03:24 -0700 | [diff] [blame] | 2105 | extern unsigned long stack_guard_gap; |
Michal Hocko | d05f316 | 2011-05-24 17:11:44 -0700 | [diff] [blame] | 2106 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
Hugh Dickins | 46dea3d | 2005-10-29 18:16:20 -0700 | [diff] [blame] | 2107 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
Michal Hocko | d05f316 | 2011-05-24 17:11:44 -0700 | [diff] [blame] | 2108 | |
| 2109 | /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */ |
| 2110 | extern int expand_downwards(struct vm_area_struct *vma, |
| 2111 | unsigned long address); |
Luck, Tony | 8ca3eb0 | 2010-08-24 11:44:18 -0700 | [diff] [blame] | 2112 | #if VM_GROWSUP |
Hugh Dickins | 46dea3d | 2005-10-29 18:16:20 -0700 | [diff] [blame] | 2113 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
Luck, Tony | 8ca3eb0 | 2010-08-24 11:44:18 -0700 | [diff] [blame] | 2114 | #else |
Linus Torvalds | fee7e49 | 2015-01-06 13:00:05 -0800 | [diff] [blame] | 2115 | #define expand_upwards(vma, address) (0) |
Matthew Wilcox | 9ab8851 | 2005-11-18 16:16:42 -0500 | [diff] [blame] | 2116 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | |
| 2118 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ |
| 2119 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); |
| 2120 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, |
| 2121 | struct vm_area_struct **pprev); |
| 2122 | |
| 2123 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, |
| 2124 | NULL if none. Assume start_addr < end_addr. */ |
| 2125 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) |
| 2126 | { |
| 2127 | struct vm_area_struct * vma = find_vma(mm,start_addr); |
| 2128 | |
| 2129 | if (vma && end_addr <= vma->vm_start) |
| 2130 | vma = NULL; |
| 2131 | return vma; |
| 2132 | } |
| 2133 | |
Hugh Dickins | cfc0eb40 | 2017-06-19 04:03:24 -0700 | [diff] [blame] | 2134 | static inline unsigned long vm_start_gap(struct vm_area_struct *vma) |
| 2135 | { |
| 2136 | unsigned long vm_start = vma->vm_start; |
| 2137 | |
| 2138 | if (vma->vm_flags & VM_GROWSDOWN) { |
| 2139 | vm_start -= stack_guard_gap; |
| 2140 | if (vm_start > vma->vm_start) |
| 2141 | vm_start = 0; |
| 2142 | } |
| 2143 | return vm_start; |
| 2144 | } |
| 2145 | |
| 2146 | static inline unsigned long vm_end_gap(struct vm_area_struct *vma) |
| 2147 | { |
| 2148 | unsigned long vm_end = vma->vm_end; |
| 2149 | |
| 2150 | if (vma->vm_flags & VM_GROWSUP) { |
| 2151 | vm_end += stack_guard_gap; |
| 2152 | if (vm_end < vma->vm_end) |
| 2153 | vm_end = -PAGE_SIZE; |
| 2154 | } |
| 2155 | return vm_end; |
| 2156 | } |
| 2157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | static inline unsigned long vma_pages(struct vm_area_struct *vma) |
| 2159 | { |
| 2160 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
| 2161 | } |
| 2162 | |
Pavel Emelyanov | 640708a | 2012-01-10 15:11:23 -0800 | [diff] [blame] | 2163 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
| 2164 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, |
| 2165 | unsigned long vm_start, unsigned long vm_end) |
| 2166 | { |
| 2167 | struct vm_area_struct *vma = find_vma(mm, vm_start); |
| 2168 | |
| 2169 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) |
| 2170 | vma = NULL; |
| 2171 | |
| 2172 | return vma; |
| 2173 | } |
| 2174 | |
David Howells | bad849b | 2010-08-26 16:00:34 +0100 | [diff] [blame] | 2175 | #ifdef CONFIG_MMU |
Hugh Dickins | 804af2c | 2006-07-26 21:39:49 +0100 | [diff] [blame] | 2176 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
Peter Feiner | 64e4550 | 2014-10-13 15:55:46 -0700 | [diff] [blame] | 2177 | void vma_set_page_prot(struct vm_area_struct *vma); |
David Howells | bad849b | 2010-08-26 16:00:34 +0100 | [diff] [blame] | 2178 | #else |
| 2179 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) |
| 2180 | { |
| 2181 | return __pgprot(0); |
| 2182 | } |
Peter Feiner | 64e4550 | 2014-10-13 15:55:46 -0700 | [diff] [blame] | 2183 | static inline void vma_set_page_prot(struct vm_area_struct *vma) |
| 2184 | { |
| 2185 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
| 2186 | } |
David Howells | bad849b | 2010-08-26 16:00:34 +0100 | [diff] [blame] | 2187 | #endif |
| 2188 | |
Aneesh Kumar K.V | 5877231 | 2013-12-06 00:08:22 +0530 | [diff] [blame] | 2189 | #ifdef CONFIG_NUMA_BALANCING |
Mel Gorman | 4b10e7d | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 2190 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 2191 | unsigned long start, unsigned long end); |
| 2192 | #endif |
| 2193 | |
Hugh Dickins | deceb6c | 2005-10-29 18:16:33 -0700 | [diff] [blame] | 2194 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
Hugh Dickins | deceb6c | 2005-10-29 18:16:33 -0700 | [diff] [blame] | 2195 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
| 2196 | unsigned long pfn, unsigned long size, pgprot_t); |
Linus Torvalds | a145dd4 | 2005-11-30 09:35:19 -0800 | [diff] [blame] | 2197 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
Nick Piggin | e0dc0d8 | 2007-02-12 00:51:36 -0800 | [diff] [blame] | 2198 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
| 2199 | unsigned long pfn); |
Andy Lutomirski | 1745cbc | 2015-12-29 20:12:20 -0800 | [diff] [blame] | 2200 | int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, |
| 2201 | unsigned long pfn, pgprot_t pgprot); |
Nick Piggin | 423bad6 | 2008-04-28 02:13:01 -0700 | [diff] [blame] | 2202 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
Dan Williams | 01c8f1c | 2016-01-15 16:56:40 -0800 | [diff] [blame] | 2203 | pfn_t pfn); |
Linus Torvalds | b4cbb19 | 2013-04-16 13:45:37 -0700 | [diff] [blame] | 2204 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
| 2205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2206 | |
Michel Lespinasse | 240aade | 2013-02-22 16:35:56 -0800 | [diff] [blame] | 2207 | struct page *follow_page_mask(struct vm_area_struct *vma, |
| 2208 | unsigned long address, unsigned int foll_flags, |
| 2209 | unsigned int *page_mask); |
| 2210 | |
| 2211 | static inline struct page *follow_page(struct vm_area_struct *vma, |
| 2212 | unsigned long address, unsigned int foll_flags) |
| 2213 | { |
| 2214 | unsigned int unused_page_mask; |
| 2215 | return follow_page_mask(vma, address, foll_flags, &unused_page_mask); |
| 2216 | } |
| 2217 | |
Hugh Dickins | deceb6c | 2005-10-29 18:16:33 -0700 | [diff] [blame] | 2218 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
| 2219 | #define FOLL_TOUCH 0x02 /* mark page accessed */ |
| 2220 | #define FOLL_GET 0x04 /* do get_page on page */ |
Hugh Dickins | 8e4b9a60 | 2009-09-21 17:03:26 -0700 | [diff] [blame] | 2221 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
Hugh Dickins | 58fa879 | 2009-09-21 17:03:31 -0700 | [diff] [blame] | 2222 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
Gleb Natapov | 318b275 | 2011-03-22 16:30:51 -0700 | [diff] [blame] | 2223 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
| 2224 | * and return without waiting upon it */ |
Kirill A. Shutemov | 84d33df | 2015-04-14 15:44:37 -0700 | [diff] [blame] | 2225 | #define FOLL_POPULATE 0x40 /* fault in page */ |
Andrea Arcangeli | 500d65d | 2011-01-13 15:46:55 -0800 | [diff] [blame] | 2226 | #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ |
Huang Ying | 69ebb83 | 2011-01-30 11:15:48 +0800 | [diff] [blame] | 2227 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
Andrea Arcangeli | 0b9d705 | 2012-10-05 21:36:27 +0200 | [diff] [blame] | 2228 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
Hugh Dickins | 5117b3b | 2013-02-22 16:36:07 -0800 | [diff] [blame] | 2229 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
Andres Lagar-Cavilla | 234b239 | 2014-09-17 10:51:48 -0700 | [diff] [blame] | 2230 | #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ |
Eric B Munson | de60f5f | 2015-11-05 18:51:36 -0800 | [diff] [blame] | 2231 | #define FOLL_MLOCK 0x1000 /* lock present pages */ |
Dave Hansen | 1e98779 | 2016-02-12 13:01:54 -0800 | [diff] [blame] | 2232 | #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */ |
Linus Torvalds | 19be0ea | 2016-10-13 13:07:36 -0700 | [diff] [blame] | 2233 | #define FOLL_COW 0x4000 /* internal GUP flag */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 2235 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
Jeremy Fitzhardinge | aee16b3 | 2007-05-06 14:48:54 -0700 | [diff] [blame] | 2236 | void *data); |
| 2237 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, |
| 2238 | unsigned long size, pte_fn_t fn, void *data); |
| 2239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2240 | |
Laura Abbott | 8823b1d | 2016-03-15 14:56:27 -0700 | [diff] [blame] | 2241 | #ifdef CONFIG_PAGE_POISONING |
| 2242 | extern bool page_poisoning_enabled(void); |
| 2243 | extern void kernel_poison_pages(struct page *page, int numpages, int enable); |
Laura Abbott | 1414c7f | 2016-03-15 14:56:30 -0700 | [diff] [blame] | 2244 | extern bool page_is_poisoned(struct page *page); |
Laura Abbott | 8823b1d | 2016-03-15 14:56:27 -0700 | [diff] [blame] | 2245 | #else |
| 2246 | static inline bool page_poisoning_enabled(void) { return false; } |
| 2247 | static inline void kernel_poison_pages(struct page *page, int numpages, |
| 2248 | int enable) { } |
Laura Abbott | 1414c7f | 2016-03-15 14:56:30 -0700 | [diff] [blame] | 2249 | static inline bool page_is_poisoned(struct page *page) { return false; } |
Laura Abbott | 8823b1d | 2016-03-15 14:56:27 -0700 | [diff] [blame] | 2250 | #endif |
| 2251 | |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 2252 | #ifdef CONFIG_DEBUG_PAGEALLOC |
Joonsoo Kim | 031bc57 | 2014-12-12 16:55:52 -0800 | [diff] [blame] | 2253 | extern bool _debug_pagealloc_enabled; |
| 2254 | extern void __kernel_map_pages(struct page *page, int numpages, int enable); |
| 2255 | |
| 2256 | static inline bool debug_pagealloc_enabled(void) |
| 2257 | { |
| 2258 | return _debug_pagealloc_enabled; |
| 2259 | } |
| 2260 | |
| 2261 | static inline void |
| 2262 | kernel_map_pages(struct page *page, int numpages, int enable) |
| 2263 | { |
| 2264 | if (!debug_pagealloc_enabled()) |
| 2265 | return; |
| 2266 | |
| 2267 | __kernel_map_pages(page, numpages, enable); |
| 2268 | } |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 2269 | #ifdef CONFIG_HIBERNATION |
| 2270 | extern bool kernel_page_present(struct page *page); |
Joonsoo Kim | 40b4413 | 2016-03-15 14:54:21 -0700 | [diff] [blame] | 2271 | #endif /* CONFIG_HIBERNATION */ |
| 2272 | #else /* CONFIG_DEBUG_PAGEALLOC */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | static inline void |
Nick Piggin | 9858db5 | 2006-10-11 01:21:30 -0700 | [diff] [blame] | 2274 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 2275 | #ifdef CONFIG_HIBERNATION |
| 2276 | static inline bool kernel_page_present(struct page *page) { return true; } |
Joonsoo Kim | 40b4413 | 2016-03-15 14:54:21 -0700 | [diff] [blame] | 2277 | #endif /* CONFIG_HIBERNATION */ |
| 2278 | static inline bool debug_pagealloc_enabled(void) |
| 2279 | { |
| 2280 | return false; |
| 2281 | } |
| 2282 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | |
Andy Lutomirski | a6c19df | 2014-08-08 14:23:40 -0700 | [diff] [blame] | 2284 | #ifdef __HAVE_ARCH_GATE_AREA |
Stephen Wilson | 31db58b | 2011-03-13 15:49:15 -0400 | [diff] [blame] | 2285 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
Andy Lutomirski | a6c19df | 2014-08-08 14:23:40 -0700 | [diff] [blame] | 2286 | extern int in_gate_area_no_mm(unsigned long addr); |
| 2287 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | #else |
Andy Lutomirski | a6c19df | 2014-08-08 14:23:40 -0700 | [diff] [blame] | 2289 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
| 2290 | { |
| 2291 | return NULL; |
| 2292 | } |
| 2293 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } |
| 2294 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) |
| 2295 | { |
| 2296 | return 0; |
| 2297 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | #endif /* __HAVE_ARCH_GATE_AREA */ |
| 2299 | |
Michal Hocko | 44a70ade | 2016-07-28 15:44:43 -0700 | [diff] [blame] | 2300 | extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm); |
| 2301 | |
Josh Triplett | 146732c | 2013-04-29 15:07:22 -0700 | [diff] [blame] | 2302 | #ifdef CONFIG_SYSCTL |
| 2303 | extern int sysctl_drop_caches; |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2304 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
Andrew Morton | 9d0243b | 2006-01-08 01:00:39 -0800 | [diff] [blame] | 2305 | void __user *, size_t *, loff_t *); |
Josh Triplett | 146732c | 2013-04-29 15:07:22 -0700 | [diff] [blame] | 2306 | #endif |
| 2307 | |
Vladimir Davydov | cb731d6 | 2015-02-12 14:58:54 -0800 | [diff] [blame] | 2308 | void drop_slab(void); |
| 2309 | void drop_slab_node(int nid); |
Andrew Morton | 9d0243b | 2006-01-08 01:00:39 -0800 | [diff] [blame] | 2310 | |
Luke Yang | 7a9166e | 2006-02-20 18:28:07 -0800 | [diff] [blame] | 2311 | #ifndef CONFIG_MMU |
| 2312 | #define randomize_va_space 0 |
| 2313 | #else |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 2314 | extern int randomize_va_space; |
Luke Yang | 7a9166e | 2006-02-20 18:28:07 -0800 | [diff] [blame] | 2315 | #endif |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 2316 | |
Sam Ravnborg | 045e72a | 2007-07-26 10:41:13 -0700 | [diff] [blame] | 2317 | const char * arch_vma_name(struct vm_area_struct *vma); |
Andi Kleen | 0325291 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 2318 | void print_vma_addr(char *prefix, unsigned long rip); |
Ingo Molnar | e6e5494 | 2006-06-27 02:53:50 -0700 | [diff] [blame] | 2319 | |
Yinghai Lu | 9bdac91 | 2010-02-10 01:20:22 -0800 | [diff] [blame] | 2320 | void sparse_mem_maps_populate_node(struct page **map_map, |
| 2321 | unsigned long pnum_begin, |
| 2322 | unsigned long pnum_end, |
| 2323 | unsigned long map_count, |
| 2324 | int nodeid); |
| 2325 | |
Yasunori Goto | 98f3cfc | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 2326 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
Andy Whitcroft | 29c7111 | 2007-10-16 01:24:14 -0700 | [diff] [blame] | 2327 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
| 2328 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); |
| 2329 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
| 2330 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); |
Christoph Lameter | 8f6aac4 | 2007-10-16 01:24:13 -0700 | [diff] [blame] | 2331 | void *vmemmap_alloc_block(unsigned long size, int node); |
Dan Williams | 4b94ffd | 2016-01-15 16:56:22 -0800 | [diff] [blame] | 2332 | struct vmem_altmap; |
| 2333 | void *__vmemmap_alloc_block_buf(unsigned long size, int node, |
| 2334 | struct vmem_altmap *altmap); |
| 2335 | static inline void *vmemmap_alloc_block_buf(unsigned long size, int node) |
| 2336 | { |
| 2337 | return __vmemmap_alloc_block_buf(size, node, NULL); |
| 2338 | } |
| 2339 | |
Christoph Lameter | 8f6aac4 | 2007-10-16 01:24:13 -0700 | [diff] [blame] | 2340 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 2341 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
| 2342 | int node); |
| 2343 | int vmemmap_populate(unsigned long start, unsigned long end, int node); |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 2344 | void vmemmap_populate_print_last(void); |
Tang Chen | 0197518 | 2013-02-22 16:33:08 -0800 | [diff] [blame] | 2345 | #ifdef CONFIG_MEMORY_HOTPLUG |
Johannes Weiner | 0aad818 | 2013-04-29 15:07:50 -0700 | [diff] [blame] | 2346 | void vmemmap_free(unsigned long start, unsigned long end); |
Tang Chen | 0197518 | 2013-02-22 16:33:08 -0800 | [diff] [blame] | 2347 | #endif |
Yasuaki Ishimatsu | 46723bf | 2013-02-22 16:33:00 -0800 | [diff] [blame] | 2348 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
| 2349 | unsigned long size); |
Andi Kleen | 6a46079 | 2009-09-16 11:50:15 +0200 | [diff] [blame] | 2350 | |
Andi Kleen | 82ba011 | 2009-12-16 12:19:57 +0100 | [diff] [blame] | 2351 | enum mf_flags { |
| 2352 | MF_COUNT_INCREASED = 1 << 0, |
Tony Luck | 7329bbe | 2011-12-13 09:27:58 -0800 | [diff] [blame] | 2353 | MF_ACTION_REQUIRED = 1 << 1, |
Tony Luck | 6751ed6 | 2012-07-11 10:20:47 -0700 | [diff] [blame] | 2354 | MF_MUST_KILL = 1 << 2, |
Naveen N. Rao | cf870c7 | 2013-07-10 14:57:01 +0530 | [diff] [blame] | 2355 | MF_SOFT_OFFLINE = 1 << 3, |
Andi Kleen | 82ba011 | 2009-12-16 12:19:57 +0100 | [diff] [blame] | 2356 | }; |
Tony Luck | cd42f4a | 2011-12-15 10:48:12 -0800 | [diff] [blame] | 2357 | extern int memory_failure(unsigned long pfn, int trapno, int flags); |
Huang Ying | ea8f5fb | 2011-07-13 13:14:27 +0800 | [diff] [blame] | 2358 | extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); |
Wu Fengguang | 847ce40 | 2009-12-16 12:19:58 +0100 | [diff] [blame] | 2359 | extern int unpoison_memory(unsigned long pfn); |
Naoya Horiguchi | ead07f6 | 2015-06-24 16:56:48 -0700 | [diff] [blame] | 2360 | extern int get_hwpoison_page(struct page *page); |
Naoya Horiguchi | 4e41a30 | 2016-01-15 16:54:07 -0800 | [diff] [blame] | 2361 | #define put_hwpoison_page(page) put_page(page) |
Andi Kleen | 6a46079 | 2009-09-16 11:50:15 +0200 | [diff] [blame] | 2362 | extern int sysctl_memory_failure_early_kill; |
| 2363 | extern int sysctl_memory_failure_recovery; |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 2364 | extern void shake_page(struct page *p, int access); |
Xishi Qiu | 293c07e | 2013-02-22 16:34:02 -0800 | [diff] [blame] | 2365 | extern atomic_long_t num_poisoned_pages; |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 2366 | extern int soft_offline_page(struct page *page, int flags); |
Andi Kleen | 6a46079 | 2009-09-16 11:50:15 +0200 | [diff] [blame] | 2367 | |
Xie XiuQi | cc637b1 | 2015-06-24 16:57:30 -0700 | [diff] [blame] | 2368 | |
| 2369 | /* |
| 2370 | * Error handlers for various types of pages. |
| 2371 | */ |
Xie XiuQi | cc3e2af | 2015-06-24 16:57:33 -0700 | [diff] [blame] | 2372 | enum mf_result { |
Xie XiuQi | cc637b1 | 2015-06-24 16:57:30 -0700 | [diff] [blame] | 2373 | MF_IGNORED, /* Error: cannot be handled */ |
| 2374 | MF_FAILED, /* Error: handling failed */ |
| 2375 | MF_DELAYED, /* Will be handled later */ |
| 2376 | MF_RECOVERED, /* Successfully recovered */ |
| 2377 | }; |
| 2378 | |
| 2379 | enum mf_action_page_type { |
| 2380 | MF_MSG_KERNEL, |
| 2381 | MF_MSG_KERNEL_HIGH_ORDER, |
| 2382 | MF_MSG_SLAB, |
| 2383 | MF_MSG_DIFFERENT_COMPOUND, |
| 2384 | MF_MSG_POISONED_HUGE, |
| 2385 | MF_MSG_HUGE, |
| 2386 | MF_MSG_FREE_HUGE, |
| 2387 | MF_MSG_UNMAP_FAILED, |
| 2388 | MF_MSG_DIRTY_SWAPCACHE, |
| 2389 | MF_MSG_CLEAN_SWAPCACHE, |
| 2390 | MF_MSG_DIRTY_MLOCKED_LRU, |
| 2391 | MF_MSG_CLEAN_MLOCKED_LRU, |
| 2392 | MF_MSG_DIRTY_UNEVICTABLE_LRU, |
| 2393 | MF_MSG_CLEAN_UNEVICTABLE_LRU, |
| 2394 | MF_MSG_DIRTY_LRU, |
| 2395 | MF_MSG_CLEAN_LRU, |
| 2396 | MF_MSG_TRUNCATED_LRU, |
| 2397 | MF_MSG_BUDDY, |
| 2398 | MF_MSG_BUDDY_2ND, |
| 2399 | MF_MSG_UNKNOWN, |
| 2400 | }; |
| 2401 | |
Andrea Arcangeli | 47ad847 | 2011-01-13 15:46:47 -0800 | [diff] [blame] | 2402 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
| 2403 | extern void clear_huge_page(struct page *page, |
| 2404 | unsigned long addr, |
| 2405 | unsigned int pages_per_huge_page); |
| 2406 | extern void copy_user_huge_page(struct page *dst, struct page *src, |
| 2407 | unsigned long addr, struct vm_area_struct *vma, |
| 2408 | unsigned int pages_per_huge_page); |
| 2409 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ |
| 2410 | |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 2411 | extern struct page_ext_operations debug_guardpage_ops; |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 2412 | |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 2413 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 2414 | extern unsigned int _debug_guardpage_minorder; |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 2415 | extern bool _debug_guardpage_enabled; |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 2416 | |
| 2417 | static inline unsigned int debug_guardpage_minorder(void) |
| 2418 | { |
| 2419 | return _debug_guardpage_minorder; |
| 2420 | } |
| 2421 | |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 2422 | static inline bool debug_guardpage_enabled(void) |
| 2423 | { |
| 2424 | return _debug_guardpage_enabled; |
| 2425 | } |
| 2426 | |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 2427 | static inline bool page_is_guard(struct page *page) |
| 2428 | { |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 2429 | struct page_ext *page_ext; |
| 2430 | |
| 2431 | if (!debug_guardpage_enabled()) |
| 2432 | return false; |
| 2433 | |
| 2434 | page_ext = lookup_page_ext(page); |
Yang Shi | 0bb2fd1 | 2016-05-20 16:58:59 -0700 | [diff] [blame] | 2435 | if (unlikely(!page_ext)) |
| 2436 | return false; |
| 2437 | |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 2438 | return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 2439 | } |
| 2440 | #else |
| 2441 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } |
Joonsoo Kim | e30825f | 2014-12-12 16:55:49 -0800 | [diff] [blame] | 2442 | static inline bool debug_guardpage_enabled(void) { return false; } |
Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 2443 | static inline bool page_is_guard(struct page *page) { return false; } |
| 2444 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
| 2445 | |
Cody P Schafer | f9872ca | 2013-04-29 15:08:01 -0700 | [diff] [blame] | 2446 | #if MAX_NUMNODES > 1 |
| 2447 | void __init setup_nr_node_ids(void); |
| 2448 | #else |
| 2449 | static inline void setup_nr_node_ids(void) {} |
| 2450 | #endif |
| 2451 | |
Vinayak Menon | 1bddbcf | 2015-03-20 14:15:39 +0530 | [diff] [blame] | 2452 | #ifdef CONFIG_PROCESS_RECLAIM |
| 2453 | struct reclaim_param { |
| 2454 | struct vm_area_struct *vma; |
| 2455 | /* Number of pages scanned */ |
| 2456 | int nr_scanned; |
| 2457 | /* max pages to reclaim */ |
| 2458 | int nr_to_reclaim; |
| 2459 | /* pages reclaimed */ |
| 2460 | int nr_reclaimed; |
| 2461 | }; |
| 2462 | extern struct reclaim_param reclaim_task_anon(struct task_struct *task, |
| 2463 | int nr_to_reclaim); |
| 2464 | #endif |
| 2465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2466 | #endif /* __KERNEL__ */ |
| 2467 | #endif /* _LINUX_MM_H */ |