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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* internal.h: mm/ internal definitions
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
Nick Piggin0f8053a2006-03-22 00:08:33 -080011#ifndef __MM_INTERNAL_H
12#define __MM_INTERNAL_H
13
14#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Jan Beulich42b77722008-07-23 21:27:10 -070016void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
17 unsigned long floor, unsigned long ceiling);
18
Nick Piggin7835e982006-03-22 00:08:40 -080019static inline void set_page_count(struct page *page, int v)
Nick Piggin77a8a782006-01-06 00:10:57 -080020{
Nick Piggin7835e982006-03-22 00:08:40 -080021 atomic_set(&page->_count, v);
22}
23
24/*
25 * Turn a non-refcounted page (->_count == 0) into refcounted with
26 * a count of one.
27 */
28static inline void set_page_refcounted(struct page *page)
29{
Qi Yongae1276b2008-02-04 22:29:27 -080030 VM_BUG_ON(PageTail(page));
Nick Piggin725d7042006-09-25 23:30:55 -070031 VM_BUG_ON(atomic_read(&page->_count));
Nick Piggin77a8a782006-01-06 00:10:57 -080032 set_page_count(page, 1);
Nick Piggin77a8a782006-01-06 00:10:57 -080033}
34
Nick Piggin0f8053a2006-03-22 00:08:33 -080035static inline void __put_page(struct page *page)
36{
37 atomic_dec(&page->_count);
38}
39
Hugh Dickins03f64622009-09-21 17:03:35 -070040extern unsigned long highest_memmap_pfn;
41
Lee Schermerhorn894bc312008-10-18 20:26:39 -070042/*
43 * in mm/vmscan.c:
44 */
Nick Piggin62695a82008-10-18 20:26:09 -070045extern int isolate_lru_page(struct page *page);
Lee Schermerhorn894bc312008-10-18 20:26:39 -070046extern void putback_lru_page(struct page *page);
Nick Piggin62695a82008-10-18 20:26:09 -070047
Lee Schermerhorn894bc312008-10-18 20:26:39 -070048/*
49 * in mm/page_alloc.c
50 */
Yasunori Goto0c0a4a52008-04-28 02:13:34 -070051extern void __free_pages_bootmem(struct page *page, unsigned int order);
Wu Fengguang20a03072009-06-16 15:32:22 -070052extern void prep_compound_page(struct page *page, unsigned long order);
Wu Fengguang8d22ba12009-12-16 12:19:58 +010053#ifdef CONFIG_MEMORY_FAILURE
54extern bool is_free_buddy_page(struct page *page);
55#endif
Wu Fengguang20a03072009-06-16 15:32:22 -070056
Nick Piggin0f8053a2006-03-22 00:08:33 -080057
Mel Gorman48f13bf2007-10-16 01:26:10 -070058/*
59 * function for dealing with page's order in buddy system.
60 * zone->lock is already acquired when we use these.
61 * So, we don't need atomic page->flags operations here.
62 */
63static inline unsigned long page_order(struct page *page)
64{
KAMEZAWA Hiroyuki572438f2010-10-26 14:22:08 -070065 /* PageBuddy() must be checked by the caller */
Mel Gorman48f13bf2007-10-16 01:26:10 -070066 return page_private(page);
67}
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -080068
Hugh Dickinsaf8e3352009-12-14 17:58:59 -080069#ifdef CONFIG_MMU
70extern long mlock_vma_pages_range(struct vm_area_struct *vma,
71 unsigned long start, unsigned long end);
72extern void munlock_vma_pages_range(struct vm_area_struct *vma,
73 unsigned long start, unsigned long end);
74static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
75{
76 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
77}
78
Nick Pigginb291f002008-10-18 20:26:44 -070079/*
80 * Called only in fault path via page_evictable() for a new page
81 * to determine if it's being mapped into a LOCKED vma.
82 * If so, mark page as mlocked.
83 */
84static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
85{
86 VM_BUG_ON(PageLRU(page));
87
88 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
89 return 0;
90
Nick Piggin5344b7e2008-10-18 20:26:51 -070091 if (!TestSetPageMlocked(page)) {
92 inc_zone_page_state(page, NR_MLOCK);
93 count_vm_event(UNEVICTABLE_PGMLOCKED);
94 }
Nick Pigginb291f002008-10-18 20:26:44 -070095 return 1;
96}
97
98/*
Hugh Dickins73848b42009-12-14 17:59:22 -080099 * must be called with vma's mmap_sem held for read or write, and page locked.
Nick Pigginb291f002008-10-18 20:26:44 -0700100 */
101extern void mlock_vma_page(struct page *page);
Hugh Dickins73848b42009-12-14 17:59:22 -0800102extern void munlock_vma_page(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700103
104/*
105 * Clear the page's PageMlocked(). This can be useful in a situation where
106 * we want to unconditionally remove a page from the pagecache -- e.g.,
107 * on truncation or freeing.
108 *
109 * It is legal to call this function for any page, mlocked or not.
110 * If called for a page that is still mapped by mlocked vmas, all we do
111 * is revert to lazy LRU behaviour -- semantics are not broken.
112 */
113extern void __clear_page_mlock(struct page *page);
114static inline void clear_page_mlock(struct page *page)
115{
116 if (unlikely(TestClearPageMlocked(page)))
117 __clear_page_mlock(page);
118}
119
120/*
121 * mlock_migrate_page - called only from migrate_page_copy() to
Nick Piggin5344b7e2008-10-18 20:26:51 -0700122 * migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700123 */
124static inline void mlock_migrate_page(struct page *newpage, struct page *page)
125{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700126 if (TestClearPageMlocked(page)) {
127 unsigned long flags;
128
129 local_irq_save(flags);
130 __dec_zone_page_state(page, NR_MLOCK);
Nick Pigginb291f002008-10-18 20:26:44 -0700131 SetPageMlocked(newpage);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700132 __inc_zone_page_state(newpage, NR_MLOCK);
133 local_irq_restore(flags);
134 }
Nick Pigginb291f002008-10-18 20:26:44 -0700135}
136
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800137#ifdef CONFIG_TRANSPARENT_HUGEPAGE
138extern unsigned long vma_address(struct page *page,
139 struct vm_area_struct *vma);
140#endif
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800141#else /* !CONFIG_MMU */
Nick Pigginb291f002008-10-18 20:26:44 -0700142static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
143{
144 return 0;
145}
146static inline void clear_page_mlock(struct page *page) { }
147static inline void mlock_vma_page(struct page *page) { }
148static inline void mlock_migrate_page(struct page *new, struct page *old) { }
149
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800150#endif /* !CONFIG_MMU */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700151
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800152/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800153 * Return the mem_map entry representing the 'offset' subpage within
154 * the maximally aligned gigantic page 'base'. Handle any discontiguity
155 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
156 */
157static inline struct page *mem_map_offset(struct page *base, int offset)
158{
159 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
160 return pfn_to_page(page_to_pfn(base) + offset);
161 return base + offset;
162}
163
164/*
165 * Iterator over all subpages withing the maximally aligned gigantic
166 * page 'base'. Handle any discontiguity in the mem_map.
167 */
168static inline struct page *mem_map_next(struct page *iter,
169 struct page *base, int offset)
170{
171 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
172 unsigned long pfn = page_to_pfn(base) + offset;
173 if (!pfn_valid(pfn))
174 return NULL;
175 return pfn_to_page(pfn);
176 }
177 return iter + 1;
178}
179
180/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800181 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
182 * so all functions starting at paging_init should be marked __init
183 * in those cases. SPARSEMEM, however, allows for memory hotplug,
184 * and alloc_bootmem_node is not used.
185 */
186#ifdef CONFIG_SPARSEMEM
187#define __paginginit __meminit
188#else
189#define __paginginit __init
190#endif
191
Mel Gorman6b74ab92008-07-23 21:26:49 -0700192/* Memory initialisation debug and verification */
193enum mminit_level {
194 MMINIT_WARNING,
195 MMINIT_VERIFY,
196 MMINIT_TRACE
197};
198
199#ifdef CONFIG_DEBUG_MEMORY_INIT
200
201extern int mminit_loglevel;
202
203#define mminit_dprintk(level, prefix, fmt, arg...) \
204do { \
205 if (level < mminit_loglevel) { \
206 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
207 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
208 } \
209} while (0)
210
Mel Gorman708614e2008-07-23 21:26:51 -0700211extern void mminit_verify_pageflags_layout(void);
212extern void mminit_verify_page_links(struct page *page,
213 enum zone_type zone, unsigned long nid, unsigned long pfn);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700214extern void mminit_verify_zonelist(void);
Mel Gorman708614e2008-07-23 21:26:51 -0700215
Mel Gorman6b74ab92008-07-23 21:26:49 -0700216#else
217
218static inline void mminit_dprintk(enum mminit_level level,
219 const char *prefix, const char *fmt, ...)
220{
221}
222
Mel Gorman708614e2008-07-23 21:26:51 -0700223static inline void mminit_verify_pageflags_layout(void)
224{
225}
226
227static inline void mminit_verify_page_links(struct page *page,
228 enum zone_type zone, unsigned long nid, unsigned long pfn)
229{
230}
Mel Gorman68ad8df2008-07-23 21:26:52 -0700231
232static inline void mminit_verify_zonelist(void)
233{
234}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700235#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700236
237/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
238#if defined(CONFIG_SPARSEMEM)
239extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
240 unsigned long *end_pfn);
241#else
242static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
243 unsigned long *end_pfn)
244{
245}
246#endif /* CONFIG_SPARSEMEM */
247
Nick Pigginb291f002008-10-18 20:26:44 -0700248int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
Hugh Dickins58fa8792009-09-21 17:03:31 -0700249 unsigned long start, int len, unsigned int foll_flags,
Michel Lespinasse53a77062011-01-13 15:46:14 -0800250 struct page **pages, struct vm_area_struct **vmas,
251 int *nonblocking);
Nick Pigginb291f002008-10-18 20:26:44 -0700252
Mel Gormanfa5e0842009-06-16 15:33:22 -0700253#define ZONE_RECLAIM_NOSCAN -2
254#define ZONE_RECLAIM_FULL -1
255#define ZONE_RECLAIM_SOME 0
256#define ZONE_RECLAIM_SUCCESS 1
Nick Piggin0f8053a2006-03-22 00:08:33 -0800257#endif
Wu Fengguang7c116f22009-12-16 12:19:59 +0100258
Wu Fengguang31d3d342009-12-16 12:19:59 +0100259extern int hwpoison_filter(struct page *p);
260
Wu Fengguang7c116f22009-12-16 12:19:59 +0100261extern u32 hwpoison_filter_dev_major;
262extern u32 hwpoison_filter_dev_minor;
Wu Fengguang478c5ff2009-12-16 12:19:59 +0100263extern u64 hwpoison_filter_flags_mask;
264extern u64 hwpoison_filter_flags_value;
Andi Kleen4fd466e2009-12-16 12:19:59 +0100265extern u64 hwpoison_filter_memcg;
Haicheng Li1bfe5fe2009-12-16 12:19:59 +0100266extern u32 hwpoison_filter_enable;