Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Macros for manipulating and testing page->flags |
| 3 | */ |
| 4 | |
| 5 | #ifndef PAGE_FLAGS_H |
| 6 | #define PAGE_FLAGS_H |
| 7 | |
Andrew Morton | f886ed4 | 2006-06-23 02:03:06 -0700 | [diff] [blame] | 8 | #include <linux/types.h> |
Paul Gortmaker | 187f188 | 2011-11-23 20:12:59 -0500 | [diff] [blame] | 9 | #include <linux/bug.h> |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 10 | #include <linux/mmdebug.h> |
Christoph Lameter | 9223b41 | 2008-04-28 02:12:48 -0700 | [diff] [blame] | 11 | #ifndef __GENERATING_BOUNDS_H |
Christoph Lameter | 6d77795 | 2007-05-06 14:49:40 -0700 | [diff] [blame] | 12 | #include <linux/mm_types.h> |
Sam Ravnborg | 01fc0ac | 2009-04-19 21:57:19 +0200 | [diff] [blame] | 13 | #include <generated/bounds.h> |
Christoph Lameter | 9223b41 | 2008-04-28 02:12:48 -0700 | [diff] [blame] | 14 | #endif /* !__GENERATING_BOUNDS_H */ |
Andrew Morton | f886ed4 | 2006-06-23 02:03:06 -0700 | [diff] [blame] | 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | /* |
| 17 | * Various page->flags bits: |
| 18 | * |
| 19 | * PG_reserved is set for special pages, which can never be swapped out. Some |
| 20 | * of them might not even exist (eg empty_bad_page)... |
| 21 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 22 | * The PG_private bitflag is set on pagecache pages if they contain filesystem |
| 23 | * specific data (which is normally at page->private). It can be used by |
| 24 | * private allocations for its own usage. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 26 | * During initiation of disk I/O, PG_locked is set. This bit is set before I/O |
| 27 | * and cleared when writeback _starts_ or when read _completes_. PG_writeback |
| 28 | * is set before writeback starts and cleared when it finishes. |
| 29 | * |
| 30 | * PG_locked also pins a page in pagecache, and blocks truncation of the file |
| 31 | * while it is held. |
| 32 | * |
| 33 | * page_waitqueue(page) is a wait queue of all tasks waiting for the page |
| 34 | * to become unlocked. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | * |
| 36 | * PG_uptodate tells whether the page's contents is valid. When a read |
| 37 | * completes, the page becomes uptodate, unless a disk I/O error happened. |
| 38 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 39 | * PG_referenced, PG_reclaim are used for page reclaim for anonymous and |
| 40 | * file-backed pagecache (see mm/vmscan.c). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | * |
| 42 | * PG_error is set to indicate that an I/O error occurred on this page. |
| 43 | * |
| 44 | * PG_arch_1 is an architecture specific page state bit. The generic code |
| 45 | * guarantees that this bit is cleared for a page when it first is entered into |
| 46 | * the page cache. |
| 47 | * |
| 48 | * PG_highmem pages are not permanently mapped into the kernel virtual address |
| 49 | * space, they need to be kmapped separately for doing IO on the pages. The |
| 50 | * struct page (these bits with information) are always mapped into kernel |
| 51 | * address space... |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 52 | * |
Andi Kleen | d466f2f | 2009-09-16 11:50:03 +0200 | [diff] [blame] | 53 | * PG_hwpoison indicates that a page got corrupted in hardware and contains |
| 54 | * data with incorrect ECC bits that triggered a machine check. Accessing is |
| 55 | * not safe since it may cause another machine check. Don't touch! |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | */ |
| 57 | |
| 58 | /* |
| 59 | * Don't use the *_dontuse flags. Use the macros. Otherwise you'll break |
Andy Whitcroft | 91fc8ab | 2006-04-10 22:53:01 -0700 | [diff] [blame] | 60 | * locked- and dirty-page accounting. |
| 61 | * |
| 62 | * The page flags field is split into two parts, the main flags area |
| 63 | * which extends from the low bits upwards, and the fields area which |
| 64 | * extends from the high bits downwards. |
| 65 | * |
| 66 | * | FIELD | ... | FLAGS | |
Christoph Lameter | 9223b41 | 2008-04-28 02:12:48 -0700 | [diff] [blame] | 67 | * N-1 ^ 0 |
| 68 | * (NR_PAGEFLAGS) |
Andy Whitcroft | 91fc8ab | 2006-04-10 22:53:01 -0700 | [diff] [blame] | 69 | * |
Christoph Lameter | 9223b41 | 2008-04-28 02:12:48 -0700 | [diff] [blame] | 70 | * The fields area is reserved for fields mapping zone, node (for NUMA) and |
| 71 | * SPARSEMEM section (for variants of SPARSEMEM that require section ids like |
| 72 | * SPARSEMEM_EXTREME with !SPARSEMEM_VMEMMAP). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | */ |
Christoph Lameter | e268318 | 2008-04-28 02:12:47 -0700 | [diff] [blame] | 74 | enum pageflags { |
| 75 | PG_locked, /* Page is locked. Don't touch. */ |
Nicholas Piggin | 49e19db | 2016-12-25 13:00:30 +1000 | [diff] [blame^] | 76 | PG_waiters, /* Page has waiters, check its waitqueue */ |
Christoph Lameter | e268318 | 2008-04-28 02:12:47 -0700 | [diff] [blame] | 77 | PG_error, |
| 78 | PG_referenced, |
| 79 | PG_uptodate, |
| 80 | PG_dirty, |
| 81 | PG_lru, |
| 82 | PG_active, |
| 83 | PG_slab, |
| 84 | PG_owner_priv_1, /* Owner use. If pagecache, fs may use*/ |
Christoph Lameter | e268318 | 2008-04-28 02:12:47 -0700 | [diff] [blame] | 85 | PG_arch_1, |
| 86 | PG_reserved, |
| 87 | PG_private, /* If pagecache, has fs-private data */ |
David Howells | 266cf65 | 2009-04-03 16:42:36 +0100 | [diff] [blame] | 88 | PG_private_2, /* If pagecache, has fs aux data */ |
Christoph Lameter | e268318 | 2008-04-28 02:12:47 -0700 | [diff] [blame] | 89 | PG_writeback, /* Page is under writeback */ |
Christoph Lameter | e20b8cc | 2008-04-28 02:12:55 -0700 | [diff] [blame] | 90 | PG_head, /* A head page */ |
Christoph Lameter | e268318 | 2008-04-28 02:12:47 -0700 | [diff] [blame] | 91 | PG_swapcache, /* Swap page: swp_entry_t in private */ |
| 92 | PG_mappedtodisk, /* Has blocks allocated on-disk */ |
| 93 | PG_reclaim, /* To be reclaimed asap */ |
Rik van Riel | b2e1853 | 2008-10-18 20:26:30 -0700 | [diff] [blame] | 94 | PG_swapbacked, /* Page is backed by RAM/swap */ |
Lee Schermerhorn | 894bc31 | 2008-10-18 20:26:39 -0700 | [diff] [blame] | 95 | PG_unevictable, /* Page is "unevictable" */ |
Hugh Dickins | af8e335 | 2009-12-14 17:58:59 -0800 | [diff] [blame] | 96 | #ifdef CONFIG_MMU |
Nick Piggin | b291f00 | 2008-10-18 20:26:44 -0700 | [diff] [blame] | 97 | PG_mlocked, /* Page is vma mlocked */ |
Lee Schermerhorn | 894bc31 | 2008-10-18 20:26:39 -0700 | [diff] [blame] | 98 | #endif |
Venkatesh Pallipadi | 46cf98c | 2009-07-10 09:57:37 -0700 | [diff] [blame] | 99 | #ifdef CONFIG_ARCH_USES_PG_UNCACHED |
Christoph Lameter | 602c4d1 | 2008-04-28 02:12:52 -0700 | [diff] [blame] | 100 | PG_uncached, /* Page has been mapped as uncached */ |
Andrew Morton | f886ed4 | 2006-06-23 02:03:06 -0700 | [diff] [blame] | 101 | #endif |
Andi Kleen | d466f2f | 2009-09-16 11:50:03 +0200 | [diff] [blame] | 102 | #ifdef CONFIG_MEMORY_FAILURE |
| 103 | PG_hwpoison, /* hardware poisoned page. Don't touch */ |
| 104 | #endif |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 105 | #if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT) |
| 106 | PG_young, |
| 107 | PG_idle, |
| 108 | #endif |
Andy Whitcroft | 0cad47c | 2008-07-23 21:27:16 -0700 | [diff] [blame] | 109 | __NR_PAGEFLAGS, |
| 110 | |
| 111 | /* Filesystems */ |
| 112 | PG_checked = PG_owner_priv_1, |
| 113 | |
David Howells | 266cf65 | 2009-04-03 16:42:36 +0100 | [diff] [blame] | 114 | /* Two page bits are conscripted by FS-Cache to maintain local caching |
| 115 | * state. These bits are set on pages belonging to the netfs's inodes |
| 116 | * when those inodes are being locally cached. |
| 117 | */ |
| 118 | PG_fscache = PG_private_2, /* page backed by cache */ |
| 119 | |
Andy Whitcroft | 0cad47c | 2008-07-23 21:27:16 -0700 | [diff] [blame] | 120 | /* XEN */ |
Jennifer Herbert | d8ac3dd | 2015-01-05 13:24:09 +0000 | [diff] [blame] | 121 | /* Pinned in Xen as a read-only pagetable page. */ |
Andy Whitcroft | 0cad47c | 2008-07-23 21:27:16 -0700 | [diff] [blame] | 122 | PG_pinned = PG_owner_priv_1, |
Jennifer Herbert | d8ac3dd | 2015-01-05 13:24:09 +0000 | [diff] [blame] | 123 | /* Pinned as part of domain save (see xen_mm_pin_all()). */ |
Andy Whitcroft | 0cad47c | 2008-07-23 21:27:16 -0700 | [diff] [blame] | 124 | PG_savepinned = PG_dirty, |
Jennifer Herbert | d8ac3dd | 2015-01-05 13:24:09 +0000 | [diff] [blame] | 125 | /* Has a grant mapping of another (foreign) domain's page. */ |
| 126 | PG_foreign = PG_owner_priv_1, |
Andy Whitcroft | 8a38082 | 2008-07-23 21:27:18 -0700 | [diff] [blame] | 127 | |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 128 | /* SLOB */ |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 129 | PG_slob_free = PG_private, |
Kirill A. Shutemov | 53f9263 | 2016-01-15 16:53:42 -0800 | [diff] [blame] | 130 | |
| 131 | /* Compound pages. Stored in first tail page's flags */ |
| 132 | PG_double_map = PG_private_2, |
Minchan Kim | bda807d | 2016-07-26 15:23:05 -0700 | [diff] [blame] | 133 | |
| 134 | /* non-lru isolated movable page */ |
| 135 | PG_isolated = PG_reclaim, |
Christoph Lameter | e268318 | 2008-04-28 02:12:47 -0700 | [diff] [blame] | 136 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
Christoph Lameter | 9223b41 | 2008-04-28 02:12:48 -0700 | [diff] [blame] | 138 | #ifndef __GENERATING_BOUNDS_H |
| 139 | |
Kirill A. Shutemov | 0e6d31a | 2016-01-15 16:51:17 -0800 | [diff] [blame] | 140 | struct page; /* forward declaration */ |
| 141 | |
| 142 | static inline struct page *compound_head(struct page *page) |
| 143 | { |
| 144 | unsigned long head = READ_ONCE(page->compound_head); |
| 145 | |
| 146 | if (unlikely(head & 1)) |
| 147 | return (struct page *) (head - 1); |
| 148 | return page; |
| 149 | } |
| 150 | |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 151 | static __always_inline int PageTail(struct page *page) |
Kirill A. Shutemov | 0e6d31a | 2016-01-15 16:51:17 -0800 | [diff] [blame] | 152 | { |
| 153 | return READ_ONCE(page->compound_head) & 1; |
| 154 | } |
| 155 | |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 156 | static __always_inline int PageCompound(struct page *page) |
Kirill A. Shutemov | 0e6d31a | 2016-01-15 16:51:17 -0800 | [diff] [blame] | 157 | { |
| 158 | return test_bit(PG_head, &page->flags) || PageTail(page); |
| 159 | } |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | /* |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 162 | * Page flags policies wrt compound pages |
| 163 | * |
| 164 | * PF_ANY: |
| 165 | * the page flag is relevant for small, head and tail pages. |
| 166 | * |
| 167 | * PF_HEAD: |
| 168 | * for compound page all operations related to the page flag applied to |
| 169 | * head page. |
| 170 | * |
Nicholas Piggin | 49e19db | 2016-12-25 13:00:30 +1000 | [diff] [blame^] | 171 | * PF_ONLY_HEAD: |
| 172 | * for compound page, callers only ever operate on the head page. |
| 173 | * |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 174 | * PF_NO_TAIL: |
| 175 | * modifications of the page flag must be done on small or head pages, |
| 176 | * checks can be done on tail pages too. |
| 177 | * |
| 178 | * PF_NO_COMPOUND: |
| 179 | * the page flag is not relevant for compound pages. |
| 180 | */ |
| 181 | #define PF_ANY(page, enforce) page |
| 182 | #define PF_HEAD(page, enforce) compound_head(page) |
Nicholas Piggin | 49e19db | 2016-12-25 13:00:30 +1000 | [diff] [blame^] | 183 | #define PF_ONLY_HEAD(page, enforce) ({ \ |
| 184 | VM_BUG_ON_PGFLAGS(PageTail(page), page); \ |
| 185 | page;}) |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 186 | #define PF_NO_TAIL(page, enforce) ({ \ |
| 187 | VM_BUG_ON_PGFLAGS(enforce && PageTail(page), page); \ |
| 188 | compound_head(page);}) |
Kirill A. Shutemov | 822cdd11 | 2016-01-15 16:52:03 -0800 | [diff] [blame] | 189 | #define PF_NO_COMPOUND(page, enforce) ({ \ |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 190 | VM_BUG_ON_PGFLAGS(enforce && PageCompound(page), page); \ |
| 191 | page;}) |
| 192 | |
| 193 | /* |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 194 | * Macros to create function definitions for page flags |
| 195 | */ |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 196 | #define TESTPAGEFLAG(uname, lname, policy) \ |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 197 | static __always_inline int Page##uname(struct page *page) \ |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 198 | { return test_bit(PG_##lname, &policy(page, 0)->flags); } |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 199 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 200 | #define SETPAGEFLAG(uname, lname, policy) \ |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 201 | static __always_inline void SetPage##uname(struct page *page) \ |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 202 | { set_bit(PG_##lname, &policy(page, 1)->flags); } |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 203 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 204 | #define CLEARPAGEFLAG(uname, lname, policy) \ |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 205 | static __always_inline void ClearPage##uname(struct page *page) \ |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 206 | { clear_bit(PG_##lname, &policy(page, 1)->flags); } |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 207 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 208 | #define __SETPAGEFLAG(uname, lname, policy) \ |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 209 | static __always_inline void __SetPage##uname(struct page *page) \ |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 210 | { __set_bit(PG_##lname, &policy(page, 1)->flags); } |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 211 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 212 | #define __CLEARPAGEFLAG(uname, lname, policy) \ |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 213 | static __always_inline void __ClearPage##uname(struct page *page) \ |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 214 | { __clear_bit(PG_##lname, &policy(page, 1)->flags); } |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 215 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 216 | #define TESTSETFLAG(uname, lname, policy) \ |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 217 | static __always_inline int TestSetPage##uname(struct page *page) \ |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 218 | { return test_and_set_bit(PG_##lname, &policy(page, 1)->flags); } |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 219 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 220 | #define TESTCLEARFLAG(uname, lname, policy) \ |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 221 | static __always_inline int TestClearPage##uname(struct page *page) \ |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 222 | { return test_and_clear_bit(PG_##lname, &policy(page, 1)->flags); } |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 223 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 224 | #define PAGEFLAG(uname, lname, policy) \ |
| 225 | TESTPAGEFLAG(uname, lname, policy) \ |
| 226 | SETPAGEFLAG(uname, lname, policy) \ |
| 227 | CLEARPAGEFLAG(uname, lname, policy) |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 228 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 229 | #define __PAGEFLAG(uname, lname, policy) \ |
| 230 | TESTPAGEFLAG(uname, lname, policy) \ |
| 231 | __SETPAGEFLAG(uname, lname, policy) \ |
| 232 | __CLEARPAGEFLAG(uname, lname, policy) |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 233 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 234 | #define TESTSCFLAG(uname, lname, policy) \ |
| 235 | TESTSETFLAG(uname, lname, policy) \ |
| 236 | TESTCLEARFLAG(uname, lname, policy) |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 237 | |
Johannes Weiner | 2f3e442 | 2014-08-06 16:05:40 -0700 | [diff] [blame] | 238 | #define TESTPAGEFLAG_FALSE(uname) \ |
| 239 | static inline int Page##uname(const struct page *page) { return 0; } |
| 240 | |
Lee Schermerhorn | 8a7a854 | 2008-10-18 20:26:37 -0700 | [diff] [blame] | 241 | #define SETPAGEFLAG_NOOP(uname) \ |
| 242 | static inline void SetPage##uname(struct page *page) { } |
| 243 | |
| 244 | #define CLEARPAGEFLAG_NOOP(uname) \ |
| 245 | static inline void ClearPage##uname(struct page *page) { } |
| 246 | |
| 247 | #define __CLEARPAGEFLAG_NOOP(uname) \ |
| 248 | static inline void __ClearPage##uname(struct page *page) { } |
| 249 | |
Johannes Weiner | 2f3e442 | 2014-08-06 16:05:40 -0700 | [diff] [blame] | 250 | #define TESTSETFLAG_FALSE(uname) \ |
| 251 | static inline int TestSetPage##uname(struct page *page) { return 0; } |
| 252 | |
Lee Schermerhorn | 8a7a854 | 2008-10-18 20:26:37 -0700 | [diff] [blame] | 253 | #define TESTCLEARFLAG_FALSE(uname) \ |
| 254 | static inline int TestClearPage##uname(struct page *page) { return 0; } |
| 255 | |
Johannes Weiner | 2f3e442 | 2014-08-06 16:05:40 -0700 | [diff] [blame] | 256 | #define PAGEFLAG_FALSE(uname) TESTPAGEFLAG_FALSE(uname) \ |
| 257 | SETPAGEFLAG_NOOP(uname) CLEARPAGEFLAG_NOOP(uname) |
| 258 | |
| 259 | #define TESTSCFLAG_FALSE(uname) \ |
| 260 | TESTSETFLAG_FALSE(uname) TESTCLEARFLAG_FALSE(uname) |
| 261 | |
Kirill A. Shutemov | 48c935a | 2016-01-15 16:51:24 -0800 | [diff] [blame] | 262 | __PAGEFLAG(Locked, locked, PF_NO_TAIL) |
Nicholas Piggin | 49e19db | 2016-12-25 13:00:30 +1000 | [diff] [blame^] | 263 | PAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) __CLEARPAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) |
Kirill A. Shutemov | df8c94d | 2016-01-15 16:51:28 -0800 | [diff] [blame] | 264 | PAGEFLAG(Error, error, PF_NO_COMPOUND) TESTCLEARFLAG(Error, error, PF_NO_COMPOUND) |
Kirill A. Shutemov | 8cb38fa | 2016-01-15 16:51:32 -0800 | [diff] [blame] | 265 | PAGEFLAG(Referenced, referenced, PF_HEAD) |
| 266 | TESTCLEARFLAG(Referenced, referenced, PF_HEAD) |
| 267 | __SETPAGEFLAG(Referenced, referenced, PF_HEAD) |
Kirill A. Shutemov | df8c94d | 2016-01-15 16:51:28 -0800 | [diff] [blame] | 268 | PAGEFLAG(Dirty, dirty, PF_HEAD) TESTSCFLAG(Dirty, dirty, PF_HEAD) |
| 269 | __CLEARPAGEFLAG(Dirty, dirty, PF_HEAD) |
Kirill A. Shutemov | 8cb38fa | 2016-01-15 16:51:32 -0800 | [diff] [blame] | 270 | PAGEFLAG(LRU, lru, PF_HEAD) __CLEARPAGEFLAG(LRU, lru, PF_HEAD) |
| 271 | PAGEFLAG(Active, active, PF_HEAD) __CLEARPAGEFLAG(Active, active, PF_HEAD) |
| 272 | TESTCLEARFLAG(Active, active, PF_HEAD) |
Kirill A. Shutemov | dcb351c | 2016-01-15 16:51:35 -0800 | [diff] [blame] | 273 | __PAGEFLAG(Slab, slab, PF_NO_TAIL) |
| 274 | __PAGEFLAG(SlobFree, slob_free, PF_NO_TAIL) |
Kirill A. Shutemov | df8c94d | 2016-01-15 16:51:28 -0800 | [diff] [blame] | 275 | PAGEFLAG(Checked, checked, PF_NO_COMPOUND) /* Used by some filesystems */ |
Kirill A. Shutemov | c13985f | 2016-01-15 16:51:39 -0800 | [diff] [blame] | 276 | |
| 277 | /* Xen */ |
| 278 | PAGEFLAG(Pinned, pinned, PF_NO_COMPOUND) |
| 279 | TESTSCFLAG(Pinned, pinned, PF_NO_COMPOUND) |
| 280 | PAGEFLAG(SavePinned, savepinned, PF_NO_COMPOUND); |
| 281 | PAGEFLAG(Foreign, foreign, PF_NO_COMPOUND); |
| 282 | |
Kirill A. Shutemov | de09d31 | 2016-01-15 16:51:42 -0800 | [diff] [blame] | 283 | PAGEFLAG(Reserved, reserved, PF_NO_COMPOUND) |
| 284 | __CLEARPAGEFLAG(Reserved, reserved, PF_NO_COMPOUND) |
Kirill A. Shutemov | da5efc4 | 2016-01-15 16:51:46 -0800 | [diff] [blame] | 285 | PAGEFLAG(SwapBacked, swapbacked, PF_NO_TAIL) |
| 286 | __CLEARPAGEFLAG(SwapBacked, swapbacked, PF_NO_TAIL) |
| 287 | __SETPAGEFLAG(SwapBacked, swapbacked, PF_NO_TAIL) |
Christoph Lameter | 6a1e7f7 | 2008-04-28 02:12:50 -0700 | [diff] [blame] | 288 | |
Christoph Lameter | f94a62e | 2008-04-28 02:12:49 -0700 | [diff] [blame] | 289 | /* |
David Howells | 266cf65 | 2009-04-03 16:42:36 +0100 | [diff] [blame] | 290 | * Private page markings that may be used by the filesystem that owns the page |
| 291 | * for its own purposes. |
| 292 | * - PG_private and PG_private_2 cause releasepage() and co to be invoked |
| 293 | */ |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 294 | PAGEFLAG(Private, private, PF_ANY) __SETPAGEFLAG(Private, private, PF_ANY) |
| 295 | __CLEARPAGEFLAG(Private, private, PF_ANY) |
| 296 | PAGEFLAG(Private2, private_2, PF_ANY) TESTSCFLAG(Private2, private_2, PF_ANY) |
| 297 | PAGEFLAG(OwnerPriv1, owner_priv_1, PF_ANY) |
| 298 | TESTCLEARFLAG(OwnerPriv1, owner_priv_1, PF_ANY) |
David Howells | 266cf65 | 2009-04-03 16:42:36 +0100 | [diff] [blame] | 299 | |
| 300 | /* |
Christoph Lameter | 6a1e7f7 | 2008-04-28 02:12:50 -0700 | [diff] [blame] | 301 | * Only test-and-set exist for PG_writeback. The unconditional operators are |
| 302 | * risky: they bypass page accounting. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | */ |
Kirill A. Shutemov | df8c94d | 2016-01-15 16:51:28 -0800 | [diff] [blame] | 304 | TESTPAGEFLAG(Writeback, writeback, PF_NO_COMPOUND) |
| 305 | TESTSCFLAG(Writeback, writeback, PF_NO_COMPOUND) |
Kirill A. Shutemov | e2f0a0d | 2016-07-26 15:25:59 -0700 | [diff] [blame] | 306 | PAGEFLAG(MappedToDisk, mappedtodisk, PF_NO_TAIL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Shaohua Li | 579f829 | 2014-02-06 12:04:21 -0800 | [diff] [blame] | 308 | /* PG_readahead is only used for reads; PG_reclaim is only for writes */ |
Kirill A. Shutemov | e2f0a0d | 2016-07-26 15:25:59 -0700 | [diff] [blame] | 309 | PAGEFLAG(Reclaim, reclaim, PF_NO_TAIL) |
| 310 | TESTCLEARFLAG(Reclaim, reclaim, PF_NO_TAIL) |
Kirill A. Shutemov | df8c94d | 2016-01-15 16:51:28 -0800 | [diff] [blame] | 311 | PAGEFLAG(Readahead, reclaim, PF_NO_COMPOUND) |
| 312 | TESTCLEARFLAG(Readahead, reclaim, PF_NO_COMPOUND) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Christoph Lameter | 6a1e7f7 | 2008-04-28 02:12:50 -0700 | [diff] [blame] | 314 | #ifdef CONFIG_HIGHMEM |
| 315 | /* |
| 316 | * Must use a macro here due to header dependency issues. page_zone() is not |
| 317 | * available at this point. |
| 318 | */ |
Vineet Gupta | 3ca65c1 | 2015-11-05 18:48:29 -0800 | [diff] [blame] | 319 | #define PageHighMem(__p) is_highmem_idx(page_zonenum(__p)) |
Christoph Lameter | 6a1e7f7 | 2008-04-28 02:12:50 -0700 | [diff] [blame] | 320 | #else |
Christoph Lameter | ec7cade | 2008-04-28 02:12:53 -0700 | [diff] [blame] | 321 | PAGEFLAG_FALSE(HighMem) |
Christoph Lameter | 6a1e7f7 | 2008-04-28 02:12:50 -0700 | [diff] [blame] | 322 | #endif |
| 323 | |
| 324 | #ifdef CONFIG_SWAP |
Kirill A. Shutemov | 50ea78d | 2016-01-15 16:51:49 -0800 | [diff] [blame] | 325 | PAGEFLAG(SwapCache, swapcache, PF_NO_COMPOUND) |
Christoph Lameter | 6a1e7f7 | 2008-04-28 02:12:50 -0700 | [diff] [blame] | 326 | #else |
Christoph Lameter | ec7cade | 2008-04-28 02:12:53 -0700 | [diff] [blame] | 327 | PAGEFLAG_FALSE(SwapCache) |
Christoph Lameter | 6a1e7f7 | 2008-04-28 02:12:50 -0700 | [diff] [blame] | 328 | #endif |
| 329 | |
Kirill A. Shutemov | 8cb38fa | 2016-01-15 16:51:32 -0800 | [diff] [blame] | 330 | PAGEFLAG(Unevictable, unevictable, PF_HEAD) |
| 331 | __CLEARPAGEFLAG(Unevictable, unevictable, PF_HEAD) |
| 332 | TESTCLEARFLAG(Unevictable, unevictable, PF_HEAD) |
Lee Schermerhorn | 894bc31 | 2008-10-18 20:26:39 -0700 | [diff] [blame] | 333 | |
Hugh Dickins | af8e335 | 2009-12-14 17:58:59 -0800 | [diff] [blame] | 334 | #ifdef CONFIG_MMU |
Kirill A. Shutemov | e4f87d5 | 2016-01-15 16:51:53 -0800 | [diff] [blame] | 335 | PAGEFLAG(Mlocked, mlocked, PF_NO_TAIL) |
| 336 | __CLEARPAGEFLAG(Mlocked, mlocked, PF_NO_TAIL) |
| 337 | TESTSCFLAG(Mlocked, mlocked, PF_NO_TAIL) |
David Howells | 33925b2 | 2009-03-31 15:23:26 -0700 | [diff] [blame] | 338 | #else |
Johannes Weiner | 2f3e442 | 2014-08-06 16:05:40 -0700 | [diff] [blame] | 339 | PAGEFLAG_FALSE(Mlocked) __CLEARPAGEFLAG_NOOP(Mlocked) |
Kirill A. Shutemov | 685eaad | 2016-01-15 16:52:10 -0800 | [diff] [blame] | 340 | TESTSCFLAG_FALSE(Mlocked) |
David Howells | 33925b2 | 2009-03-31 15:23:26 -0700 | [diff] [blame] | 341 | #endif |
| 342 | |
Venkatesh Pallipadi | 46cf98c | 2009-07-10 09:57:37 -0700 | [diff] [blame] | 343 | #ifdef CONFIG_ARCH_USES_PG_UNCACHED |
Kirill A. Shutemov | b9d4181 | 2016-01-15 16:51:56 -0800 | [diff] [blame] | 344 | PAGEFLAG(Uncached, uncached, PF_NO_COMPOUND) |
Christoph Lameter | 602c4d1 | 2008-04-28 02:12:52 -0700 | [diff] [blame] | 345 | #else |
Christoph Lameter | ec7cade | 2008-04-28 02:12:53 -0700 | [diff] [blame] | 346 | PAGEFLAG_FALSE(Uncached) |
Christoph Lameter | 6a1e7f7 | 2008-04-28 02:12:50 -0700 | [diff] [blame] | 347 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | |
Andi Kleen | d466f2f | 2009-09-16 11:50:03 +0200 | [diff] [blame] | 349 | #ifdef CONFIG_MEMORY_FAILURE |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 350 | PAGEFLAG(HWPoison, hwpoison, PF_ANY) |
| 351 | TESTSCFLAG(HWPoison, hwpoison, PF_ANY) |
Andi Kleen | d466f2f | 2009-09-16 11:50:03 +0200 | [diff] [blame] | 352 | #define __PG_HWPOISON (1UL << PG_hwpoison) |
| 353 | #else |
| 354 | PAGEFLAG_FALSE(HWPoison) |
| 355 | #define __PG_HWPOISON 0 |
| 356 | #endif |
| 357 | |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 358 | #if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT) |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 359 | TESTPAGEFLAG(Young, young, PF_ANY) |
| 360 | SETPAGEFLAG(Young, young, PF_ANY) |
| 361 | TESTCLEARFLAG(Young, young, PF_ANY) |
| 362 | PAGEFLAG(Idle, idle, PF_ANY) |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 363 | #endif |
| 364 | |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 365 | /* |
| 366 | * On an anonymous page mapped into a user virtual memory area, |
| 367 | * page->mapping points to its anon_vma, not to a struct address_space; |
| 368 | * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. |
| 369 | * |
| 370 | * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled, |
Minchan Kim | bda807d | 2016-07-26 15:23:05 -0700 | [diff] [blame] | 371 | * the PAGE_MAPPING_MOVABLE bit may be set along with the PAGE_MAPPING_ANON |
| 372 | * bit; and then page->mapping points, not to an anon_vma, but to a private |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 373 | * structure which KSM associates with that merged page. See ksm.h. |
| 374 | * |
Minchan Kim | bda807d | 2016-07-26 15:23:05 -0700 | [diff] [blame] | 375 | * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is used for non-lru movable |
| 376 | * page and then page->mapping points a struct address_space. |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 377 | * |
| 378 | * Please note that, confusingly, "page_mapping" refers to the inode |
| 379 | * address_space which maps the page from disk; whereas "page_mapped" |
| 380 | * refers to user virtual address space into which the page is mapped. |
| 381 | */ |
Minchan Kim | bda807d | 2016-07-26 15:23:05 -0700 | [diff] [blame] | 382 | #define PAGE_MAPPING_ANON 0x1 |
| 383 | #define PAGE_MAPPING_MOVABLE 0x2 |
| 384 | #define PAGE_MAPPING_KSM (PAGE_MAPPING_ANON | PAGE_MAPPING_MOVABLE) |
| 385 | #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_MOVABLE) |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 386 | |
Minchan Kim | bda807d | 2016-07-26 15:23:05 -0700 | [diff] [blame] | 387 | static __always_inline int PageMappingFlags(struct page *page) |
Mel Gorman | 1751457 | 2016-05-19 17:13:21 -0700 | [diff] [blame] | 388 | { |
Minchan Kim | bda807d | 2016-07-26 15:23:05 -0700 | [diff] [blame] | 389 | return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) != 0; |
Mel Gorman | 1751457 | 2016-05-19 17:13:21 -0700 | [diff] [blame] | 390 | } |
| 391 | |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 392 | static __always_inline int PageAnon(struct page *page) |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 393 | { |
Kirill A. Shutemov | 822cdd11 | 2016-01-15 16:52:03 -0800 | [diff] [blame] | 394 | page = compound_head(page); |
Minchan Kim | bda807d | 2016-07-26 15:23:05 -0700 | [diff] [blame] | 395 | return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; |
| 396 | } |
| 397 | |
| 398 | static __always_inline int __PageMovable(struct page *page) |
| 399 | { |
| 400 | return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) == |
| 401 | PAGE_MAPPING_MOVABLE; |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 402 | } |
| 403 | |
| 404 | #ifdef CONFIG_KSM |
| 405 | /* |
| 406 | * A KSM page is one of those write-protected "shared pages" or "merged pages" |
| 407 | * which KSM maps into multiple mms, wherever identical anonymous page content |
| 408 | * is found in VM_MERGEABLE vmas. It's a PageAnon page, pointing not to any |
| 409 | * anon_vma, but to that page's node of the stable tree. |
| 410 | */ |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 411 | static __always_inline int PageKsm(struct page *page) |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 412 | { |
Kirill A. Shutemov | 822cdd11 | 2016-01-15 16:52:03 -0800 | [diff] [blame] | 413 | page = compound_head(page); |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 414 | return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) == |
Minchan Kim | bda807d | 2016-07-26 15:23:05 -0700 | [diff] [blame] | 415 | PAGE_MAPPING_KSM; |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 416 | } |
| 417 | #else |
| 418 | TESTPAGEFLAG_FALSE(Ksm) |
| 419 | #endif |
| 420 | |
Wu Fengguang | 1a9b5b7 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 421 | u64 stable_page_flags(struct page *page); |
| 422 | |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 423 | static inline int PageUptodate(struct page *page) |
| 424 | { |
Kirill A. Shutemov | d2998c4 | 2016-01-15 16:52:00 -0800 | [diff] [blame] | 425 | int ret; |
| 426 | page = compound_head(page); |
| 427 | ret = test_bit(PG_uptodate, &(page)->flags); |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 428 | /* |
| 429 | * Must ensure that the data we read out of the page is loaded |
| 430 | * _after_ we've loaded page->flags to check for PageUptodate. |
| 431 | * We can skip the barrier if the page is not uptodate, because |
| 432 | * we wouldn't be reading anything from it. |
| 433 | * |
| 434 | * See SetPageUptodate() for the other side of the story. |
| 435 | */ |
| 436 | if (ret) |
| 437 | smp_rmb(); |
| 438 | |
| 439 | return ret; |
| 440 | } |
| 441 | |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 442 | static __always_inline void __SetPageUptodate(struct page *page) |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 443 | { |
Kirill A. Shutemov | d2998c4 | 2016-01-15 16:52:00 -0800 | [diff] [blame] | 444 | VM_BUG_ON_PAGE(PageTail(page), page); |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 445 | smp_wmb(); |
Kirill A. Shutemov | df8c94d | 2016-01-15 16:51:28 -0800 | [diff] [blame] | 446 | __set_bit(PG_uptodate, &page->flags); |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 447 | } |
| 448 | |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 449 | static __always_inline void SetPageUptodate(struct page *page) |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 450 | { |
Kirill A. Shutemov | d2998c4 | 2016-01-15 16:52:00 -0800 | [diff] [blame] | 451 | VM_BUG_ON_PAGE(PageTail(page), page); |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 452 | /* |
| 453 | * Memory barrier must be issued before setting the PG_uptodate bit, |
| 454 | * so that all previous stores issued in order to bring the page |
| 455 | * uptodate are actually visible before PageUptodate becomes true. |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 456 | */ |
| 457 | smp_wmb(); |
Kirill A. Shutemov | df8c94d | 2016-01-15 16:51:28 -0800 | [diff] [blame] | 458 | set_bit(PG_uptodate, &page->flags); |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 459 | } |
| 460 | |
Kirill A. Shutemov | d2998c4 | 2016-01-15 16:52:00 -0800 | [diff] [blame] | 461 | CLEARPAGEFLAG(Uptodate, uptodate, PF_NO_TAIL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | int test_clear_page_writeback(struct page *page); |
Namjae Jeon | 1c8349a | 2014-05-12 08:12:25 -0400 | [diff] [blame] | 464 | int __test_set_page_writeback(struct page *page, bool keep_write); |
| 465 | |
| 466 | #define test_set_page_writeback(page) \ |
| 467 | __test_set_page_writeback(page, false) |
| 468 | #define test_set_page_writeback_keepwrite(page) \ |
| 469 | __test_set_page_writeback(page, true) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | static inline void set_page_writeback(struct page *page) |
| 472 | { |
| 473 | test_set_page_writeback(page); |
| 474 | } |
| 475 | |
Namjae Jeon | 1c8349a | 2014-05-12 08:12:25 -0400 | [diff] [blame] | 476 | static inline void set_page_writeback_keepwrite(struct page *page) |
| 477 | { |
| 478 | test_set_page_writeback_keepwrite(page); |
| 479 | } |
| 480 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 481 | __PAGEFLAG(Head, head, PF_ANY) CLEARPAGEFLAG(Head, head, PF_ANY) |
Kirill A. Shutemov | 1d798ca | 2015-11-06 16:29:54 -0800 | [diff] [blame] | 482 | |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 483 | static __always_inline void set_compound_head(struct page *page, struct page *head) |
Kirill A. Shutemov | 1d798ca | 2015-11-06 16:29:54 -0800 | [diff] [blame] | 484 | { |
| 485 | WRITE_ONCE(page->compound_head, (unsigned long)head + 1); |
| 486 | } |
| 487 | |
Denys Vlasenko | 4b0f326 | 2016-03-17 14:18:24 -0700 | [diff] [blame] | 488 | static __always_inline void clear_compound_head(struct page *page) |
Kirill A. Shutemov | 1d798ca | 2015-11-06 16:29:54 -0800 | [diff] [blame] | 489 | { |
| 490 | WRITE_ONCE(page->compound_head, 0); |
| 491 | } |
| 492 | |
Andrea Arcangeli | 4e6af67 | 2011-01-13 15:46:44 -0800 | [diff] [blame] | 493 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 494 | static inline void ClearPageCompound(struct page *page) |
| 495 | { |
| 496 | BUG_ON(!PageHead(page)); |
| 497 | ClearPageHead(page); |
| 498 | } |
| 499 | #endif |
Petr Tesarik | b3acc56 | 2014-06-23 13:22:03 -0700 | [diff] [blame] | 500 | |
Yu Zhao | d2a1a1f | 2016-05-20 16:58:16 -0700 | [diff] [blame] | 501 | #define PG_head_mask ((1UL << PG_head)) |
Petr Tesarik | b3acc56 | 2014-06-23 13:22:03 -0700 | [diff] [blame] | 502 | |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 503 | #ifdef CONFIG_HUGETLB_PAGE |
| 504 | int PageHuge(struct page *page); |
| 505 | int PageHeadHuge(struct page *page); |
Naoya Horiguchi | 7e1f049 | 2015-04-15 16:14:41 -0700 | [diff] [blame] | 506 | bool page_huge_active(struct page *page); |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 507 | #else |
| 508 | TESTPAGEFLAG_FALSE(Huge) |
| 509 | TESTPAGEFLAG_FALSE(HeadHuge) |
Naoya Horiguchi | 7e1f049 | 2015-04-15 16:14:41 -0700 | [diff] [blame] | 510 | |
| 511 | static inline bool page_huge_active(struct page *page) |
| 512 | { |
| 513 | return 0; |
| 514 | } |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 515 | #endif |
| 516 | |
Naoya Horiguchi | 7e1f049 | 2015-04-15 16:14:41 -0700 | [diff] [blame] | 517 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 518 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
Andrea Arcangeli | 71e3aac | 2011-01-13 15:46:52 -0800 | [diff] [blame] | 519 | /* |
| 520 | * PageHuge() only returns true for hugetlbfs pages, but not for |
| 521 | * normal or transparent huge pages. |
| 522 | * |
| 523 | * PageTransHuge() returns true for both transparent huge and |
| 524 | * hugetlbfs pages, but not normal pages. PageTransHuge() can only be |
| 525 | * called only in the core VM paths where hugetlbfs pages can't exist. |
| 526 | */ |
| 527 | static inline int PageTransHuge(struct page *page) |
| 528 | { |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 529 | VM_BUG_ON_PAGE(PageTail(page), page); |
Andrea Arcangeli | 71e3aac | 2011-01-13 15:46:52 -0800 | [diff] [blame] | 530 | return PageHead(page); |
| 531 | } |
| 532 | |
Dean Nelson | 385de35 | 2012-03-21 16:34:05 -0700 | [diff] [blame] | 533 | /* |
| 534 | * PageTransCompound returns true for both transparent huge pages |
| 535 | * and hugetlbfs pages, so it should only be called when it's known |
| 536 | * that hugetlbfs pages aren't involved. |
| 537 | */ |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 538 | static inline int PageTransCompound(struct page *page) |
| 539 | { |
| 540 | return PageCompound(page); |
| 541 | } |
Andrea Arcangeli | 71e3aac | 2011-01-13 15:46:52 -0800 | [diff] [blame] | 542 | |
Dean Nelson | 385de35 | 2012-03-21 16:34:05 -0700 | [diff] [blame] | 543 | /* |
Andrea Arcangeli | 127393f | 2016-05-05 16:22:20 -0700 | [diff] [blame] | 544 | * PageTransCompoundMap is the same as PageTransCompound, but it also |
| 545 | * guarantees the primary MMU has the entire compound page mapped |
| 546 | * through pmd_trans_huge, which in turn guarantees the secondary MMUs |
| 547 | * can also map the entire compound page. This allows the secondary |
| 548 | * MMUs to call get_user_pages() only once for each compound page and |
| 549 | * to immediately map the entire compound page with a single secondary |
| 550 | * MMU fault. If there will be a pmd split later, the secondary MMUs |
| 551 | * will get an update through the MMU notifier invalidation through |
| 552 | * split_huge_pmd(). |
| 553 | * |
| 554 | * Unlike PageTransCompound, this is safe to be called only while |
| 555 | * split_huge_pmd() cannot run from under us, like if protected by the |
| 556 | * MMU notifier, otherwise it may result in page->_mapcount < 0 false |
| 557 | * positives. |
| 558 | */ |
| 559 | static inline int PageTransCompoundMap(struct page *page) |
| 560 | { |
| 561 | return PageTransCompound(page) && atomic_read(&page->_mapcount) < 0; |
| 562 | } |
| 563 | |
| 564 | /* |
Dean Nelson | 385de35 | 2012-03-21 16:34:05 -0700 | [diff] [blame] | 565 | * PageTransTail returns true for both transparent huge pages |
| 566 | * and hugetlbfs pages, so it should only be called when it's known |
| 567 | * that hugetlbfs pages aren't involved. |
| 568 | */ |
| 569 | static inline int PageTransTail(struct page *page) |
| 570 | { |
| 571 | return PageTail(page); |
| 572 | } |
| 573 | |
Kirill A. Shutemov | 53f9263 | 2016-01-15 16:53:42 -0800 | [diff] [blame] | 574 | /* |
| 575 | * PageDoubleMap indicates that the compound page is mapped with PTEs as well |
| 576 | * as PMDs. |
| 577 | * |
| 578 | * This is required for optimization of rmap operations for THP: we can postpone |
| 579 | * per small page mapcount accounting (and its overhead from atomic operations) |
| 580 | * until the first PMD split. |
| 581 | * |
| 582 | * For the page PageDoubleMap means ->_mapcount in all sub-pages is offset up |
| 583 | * by one. This reference will go away with last compound_mapcount. |
| 584 | * |
| 585 | * See also __split_huge_pmd_locked() and page_remove_anon_compound_rmap(). |
| 586 | */ |
| 587 | static inline int PageDoubleMap(struct page *page) |
| 588 | { |
| 589 | return PageHead(page) && test_bit(PG_double_map, &page[1].flags); |
| 590 | } |
| 591 | |
Kirill A. Shutemov | 9a73f61 | 2016-07-26 15:25:53 -0700 | [diff] [blame] | 592 | static inline void SetPageDoubleMap(struct page *page) |
| 593 | { |
| 594 | VM_BUG_ON_PAGE(!PageHead(page), page); |
| 595 | set_bit(PG_double_map, &page[1].flags); |
| 596 | } |
| 597 | |
| 598 | static inline void ClearPageDoubleMap(struct page *page) |
| 599 | { |
| 600 | VM_BUG_ON_PAGE(!PageHead(page), page); |
| 601 | clear_bit(PG_double_map, &page[1].flags); |
| 602 | } |
Kirill A. Shutemov | 53f9263 | 2016-01-15 16:53:42 -0800 | [diff] [blame] | 603 | static inline int TestSetPageDoubleMap(struct page *page) |
| 604 | { |
| 605 | VM_BUG_ON_PAGE(!PageHead(page), page); |
| 606 | return test_and_set_bit(PG_double_map, &page[1].flags); |
| 607 | } |
| 608 | |
| 609 | static inline int TestClearPageDoubleMap(struct page *page) |
| 610 | { |
| 611 | VM_BUG_ON_PAGE(!PageHead(page), page); |
| 612 | return test_and_clear_bit(PG_double_map, &page[1].flags); |
| 613 | } |
| 614 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 615 | #else |
Kirill A. Shutemov | d8c1bde | 2016-01-15 16:51:13 -0800 | [diff] [blame] | 616 | TESTPAGEFLAG_FALSE(TransHuge) |
| 617 | TESTPAGEFLAG_FALSE(TransCompound) |
Andrea Arcangeli | 127393f | 2016-05-05 16:22:20 -0700 | [diff] [blame] | 618 | TESTPAGEFLAG_FALSE(TransCompoundMap) |
Kirill A. Shutemov | d8c1bde | 2016-01-15 16:51:13 -0800 | [diff] [blame] | 619 | TESTPAGEFLAG_FALSE(TransTail) |
Kirill A. Shutemov | 9a73f61 | 2016-07-26 15:25:53 -0700 | [diff] [blame] | 620 | PAGEFLAG_FALSE(DoubleMap) |
Kirill A. Shutemov | 53f9263 | 2016-01-15 16:53:42 -0800 | [diff] [blame] | 621 | TESTSETFLAG_FALSE(DoubleMap) |
| 622 | TESTCLEARFLAG_FALSE(DoubleMap) |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 623 | #endif |
| 624 | |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 625 | /* |
Vladimir Davydov | 632c0a1 | 2016-07-26 15:24:18 -0700 | [diff] [blame] | 626 | * For pages that are never mapped to userspace, page->mapcount may be |
| 627 | * used for storing extra information about page type. Any value used |
| 628 | * for this purpose must be <= -2, but it's better start not too close |
| 629 | * to -2 so that an underflow of the page_mapcount() won't be mistaken |
| 630 | * for a special page. |
| 631 | */ |
| 632 | #define PAGE_MAPCOUNT_OPS(uname, lname) \ |
| 633 | static __always_inline int Page##uname(struct page *page) \ |
| 634 | { \ |
| 635 | return atomic_read(&page->_mapcount) == \ |
| 636 | PAGE_##lname##_MAPCOUNT_VALUE; \ |
| 637 | } \ |
| 638 | static __always_inline void __SetPage##uname(struct page *page) \ |
| 639 | { \ |
| 640 | VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page); \ |
| 641 | atomic_set(&page->_mapcount, PAGE_##lname##_MAPCOUNT_VALUE); \ |
| 642 | } \ |
| 643 | static __always_inline void __ClearPage##uname(struct page *page) \ |
| 644 | { \ |
| 645 | VM_BUG_ON_PAGE(!Page##uname(page), page); \ |
| 646 | atomic_set(&page->_mapcount, -1); \ |
| 647 | } |
| 648 | |
| 649 | /* |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 650 | * PageBuddy() indicate that the page is free and in the buddy system |
| 651 | * (see mm/page_alloc.c). |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 652 | */ |
Vladimir Davydov | 632c0a1 | 2016-07-26 15:24:18 -0700 | [diff] [blame] | 653 | #define PAGE_BUDDY_MAPCOUNT_VALUE (-128) |
| 654 | PAGE_MAPCOUNT_OPS(Buddy, BUDDY) |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 655 | |
Vladimir Davydov | 632c0a1 | 2016-07-26 15:24:18 -0700 | [diff] [blame] | 656 | /* |
| 657 | * PageBalloon() is set on pages that are on the balloon page list |
| 658 | * (see mm/balloon_compaction.c). |
| 659 | */ |
| 660 | #define PAGE_BALLOON_MAPCOUNT_VALUE (-256) |
| 661 | PAGE_MAPCOUNT_OPS(Balloon, BALLOON) |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 662 | |
Vladimir Davydov | 4949148 | 2016-07-26 15:24:24 -0700 | [diff] [blame] | 663 | /* |
| 664 | * If kmemcg is enabled, the buddy allocator will set PageKmemcg() on |
| 665 | * pages allocated with __GFP_ACCOUNT. It gets cleared on page free. |
| 666 | */ |
| 667 | #define PAGE_KMEMCG_MAPCOUNT_VALUE (-512) |
| 668 | PAGE_MAPCOUNT_OPS(Kmemcg, KMEMCG) |
| 669 | |
Naoya Horiguchi | 832fc1d | 2016-03-17 14:17:41 -0700 | [diff] [blame] | 670 | extern bool is_free_buddy_page(struct page *page); |
| 671 | |
Minchan Kim | bda807d | 2016-07-26 15:23:05 -0700 | [diff] [blame] | 672 | __PAGEFLAG(Isolated, isolated, PF_ANY); |
| 673 | |
Kirill A. Shutemov | e8c6158 | 2015-04-15 16:13:08 -0700 | [diff] [blame] | 674 | /* |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 675 | * If network-based swap is enabled, sl*b must keep track of whether pages |
| 676 | * were allocated from pfmemalloc reserves. |
| 677 | */ |
| 678 | static inline int PageSlabPfmemalloc(struct page *page) |
| 679 | { |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 680 | VM_BUG_ON_PAGE(!PageSlab(page), page); |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 681 | return PageActive(page); |
| 682 | } |
| 683 | |
| 684 | static inline void SetPageSlabPfmemalloc(struct page *page) |
| 685 | { |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 686 | VM_BUG_ON_PAGE(!PageSlab(page), page); |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 687 | SetPageActive(page); |
| 688 | } |
| 689 | |
| 690 | static inline void __ClearPageSlabPfmemalloc(struct page *page) |
| 691 | { |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 692 | VM_BUG_ON_PAGE(!PageSlab(page), page); |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 693 | __ClearPageActive(page); |
| 694 | } |
| 695 | |
| 696 | static inline void ClearPageSlabPfmemalloc(struct page *page) |
| 697 | { |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 698 | VM_BUG_ON_PAGE(!PageSlab(page), page); |
Mel Gorman | 072bb0a | 2012-07-31 16:43:58 -0700 | [diff] [blame] | 699 | ClearPageActive(page); |
| 700 | } |
| 701 | |
Hugh Dickins | af8e335 | 2009-12-14 17:58:59 -0800 | [diff] [blame] | 702 | #ifdef CONFIG_MMU |
Yu Zhao | d2a1a1f | 2016-05-20 16:58:16 -0700 | [diff] [blame] | 703 | #define __PG_MLOCKED (1UL << PG_mlocked) |
David Howells | 33925b2 | 2009-03-31 15:23:26 -0700 | [diff] [blame] | 704 | #else |
Nick Piggin | b291f00 | 2008-10-18 20:26:44 -0700 | [diff] [blame] | 705 | #define __PG_MLOCKED 0 |
Lee Schermerhorn | 894bc31 | 2008-10-18 20:26:39 -0700 | [diff] [blame] | 706 | #endif |
| 707 | |
Russ Anderson | dfa7e20 | 2008-06-09 11:18:45 -0500 | [diff] [blame] | 708 | /* |
| 709 | * Flags checked when a page is freed. Pages being freed should not have |
| 710 | * these flags set. It they are, there is a problem. |
| 711 | */ |
Hugh Dickins | 79f4b7b | 2009-01-06 14:40:05 -0800 | [diff] [blame] | 712 | #define PAGE_FLAGS_CHECK_AT_FREE \ |
Yu Zhao | d2a1a1f | 2016-05-20 16:58:16 -0700 | [diff] [blame] | 713 | (1UL << PG_lru | 1UL << PG_locked | \ |
| 714 | 1UL << PG_private | 1UL << PG_private_2 | \ |
| 715 | 1UL << PG_writeback | 1UL << PG_reserved | \ |
| 716 | 1UL << PG_slab | 1UL << PG_swapcache | 1UL << PG_active | \ |
| 717 | 1UL << PG_unevictable | __PG_MLOCKED) |
Russ Anderson | dfa7e20 | 2008-06-09 11:18:45 -0500 | [diff] [blame] | 718 | |
| 719 | /* |
| 720 | * Flags checked when a page is prepped for return by the page allocator. |
Naoya Horiguchi | f4c18e6 | 2015-08-06 15:47:08 -0700 | [diff] [blame] | 721 | * Pages being prepped should not have these flags set. It they are set, |
Hugh Dickins | 79f4b7b | 2009-01-06 14:40:05 -0800 | [diff] [blame] | 722 | * there has been a kernel bug or struct page corruption. |
Naoya Horiguchi | f4c18e6 | 2015-08-06 15:47:08 -0700 | [diff] [blame] | 723 | * |
| 724 | * __PG_HWPOISON is exceptional because it needs to be kept beyond page's |
| 725 | * alloc-free cycle to prevent from reusing the page. |
Russ Anderson | dfa7e20 | 2008-06-09 11:18:45 -0500 | [diff] [blame] | 726 | */ |
Naoya Horiguchi | f4c18e6 | 2015-08-06 15:47:08 -0700 | [diff] [blame] | 727 | #define PAGE_FLAGS_CHECK_AT_PREP \ |
Yu Zhao | d2a1a1f | 2016-05-20 16:58:16 -0700 | [diff] [blame] | 728 | (((1UL << NR_PAGEFLAGS) - 1) & ~__PG_HWPOISON) |
Russ Anderson | dfa7e20 | 2008-06-09 11:18:45 -0500 | [diff] [blame] | 729 | |
Johannes Weiner | edcf474 | 2009-09-21 17:02:59 -0700 | [diff] [blame] | 730 | #define PAGE_FLAGS_PRIVATE \ |
Yu Zhao | d2a1a1f | 2016-05-20 16:58:16 -0700 | [diff] [blame] | 731 | (1UL << PG_private | 1UL << PG_private_2) |
David Howells | 266cf65 | 2009-04-03 16:42:36 +0100 | [diff] [blame] | 732 | /** |
| 733 | * page_has_private - Determine if page has private stuff |
| 734 | * @page: The page to be checked |
| 735 | * |
| 736 | * Determine if a page has private stuff, indicating that release routines |
| 737 | * should be invoked upon it. |
| 738 | */ |
Johannes Weiner | edcf474 | 2009-09-21 17:02:59 -0700 | [diff] [blame] | 739 | static inline int page_has_private(struct page *page) |
| 740 | { |
| 741 | return !!(page->flags & PAGE_FLAGS_PRIVATE); |
| 742 | } |
| 743 | |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 744 | #undef PF_ANY |
| 745 | #undef PF_HEAD |
Nicholas Piggin | 49e19db | 2016-12-25 13:00:30 +1000 | [diff] [blame^] | 746 | #undef PF_ONLY_HEAD |
Kirill A. Shutemov | 95ad975 | 2016-01-15 16:51:21 -0800 | [diff] [blame] | 747 | #undef PF_NO_TAIL |
| 748 | #undef PF_NO_COMPOUND |
Johannes Weiner | edcf474 | 2009-09-21 17:02:59 -0700 | [diff] [blame] | 749 | #endif /* !__GENERATING_BOUNDS_H */ |
David Howells | 266cf65 | 2009-04-03 16:42:36 +0100 | [diff] [blame] | 750 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | #endif /* PAGE_FLAGS_H */ |