blob: 38e24b89e4c400394212941a1789dd75bb902198 [file] [log] [blame]
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
Fabian Frederick29f175d2014-04-07 15:37:55 -070014#include <linux/fs.h>
Nick Piggin0f8053a2006-03-22 00:08:33 -080015#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
Mel Gormandd56b042015-11-06 16:28:43 -080017/*
18 * The set of flags that only affect watermark checking and reclaim
19 * behaviour. This is used by the MM to obey the caller constraints
20 * about IO, FS and watermark checking while ignoring placement
21 * hints such as HIGHMEM usage.
22 */
23#define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\
24 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
25 __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC)
26
27/* The GFP flags allowed during early boot */
28#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS))
29
30/* Control allocation cpuset and node placement constraints */
31#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
32
33/* Do not use these with a slab allocator */
34#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
35
Jan Beulich42b77722008-07-23 21:27:10 -070036void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
37 unsigned long floor, unsigned long ceiling);
38
Nick Piggin7835e982006-03-22 00:08:40 -080039static inline void set_page_count(struct page *page, int v)
Nick Piggin77a8a782006-01-06 00:10:57 -080040{
Nick Piggin7835e982006-03-22 00:08:40 -080041 atomic_set(&page->_count, v);
42}
43
Fabian Frederick29f175d2014-04-07 15:37:55 -070044extern int __do_page_cache_readahead(struct address_space *mapping,
45 struct file *filp, pgoff_t offset, unsigned long nr_to_read,
46 unsigned long lookahead_size);
47
48/*
49 * Submit IO for the read-ahead request in file_ra_state.
50 */
51static inline unsigned long ra_submit(struct file_ra_state *ra,
52 struct address_space *mapping, struct file *filp)
53{
54 return __do_page_cache_readahead(mapping, filp,
55 ra->start, ra->size, ra->async_size);
56}
57
Nick Piggin7835e982006-03-22 00:08:40 -080058/*
59 * Turn a non-refcounted page (->_count == 0) into refcounted with
60 * a count of one.
61 */
62static inline void set_page_refcounted(struct page *page)
63{
Sasha Levin309381fea2014-01-23 15:52:54 -080064 VM_BUG_ON_PAGE(PageTail(page), page);
65 VM_BUG_ON_PAGE(atomic_read(&page->_count), page);
Nick Piggin77a8a782006-01-06 00:10:57 -080066 set_page_count(page, 1);
Nick Piggin77a8a782006-01-06 00:10:57 -080067}
68
Andrea Arcangeli70b50f92011-11-02 13:36:59 -070069static inline void __get_page_tail_foll(struct page *page,
70 bool get_page_head)
71{
72 /*
73 * If we're getting a tail page, the elevated page->_count is
74 * required only in the head page and we will elevate the head
75 * page->_count and tail page->_mapcount.
76 *
77 * We elevate page_tail->_mapcount for tail pages to force
78 * page_tail->_count to be zero at all times to avoid getting
79 * false positives from get_page_unless_zero() with
80 * speculative page access (like in
81 * page_cache_get_speculative()) on tail pages.
82 */
Kirill A. Shutemov1d798ca2015-11-06 16:29:54 -080083 VM_BUG_ON_PAGE(atomic_read(&compound_head(page)->_count) <= 0, page);
Andrea Arcangeli70b50f92011-11-02 13:36:59 -070084 if (get_page_head)
Kirill A. Shutemov1d798ca2015-11-06 16:29:54 -080085 atomic_inc(&compound_head(page)->_count);
Oleg Nesterovc7288522014-01-21 15:49:02 -080086 get_huge_page_tail(page);
Andrea Arcangeli70b50f92011-11-02 13:36:59 -070087}
88
89/*
90 * This is meant to be called as the FOLL_GET operation of
91 * follow_page() and it must be called while holding the proper PT
92 * lock while the pte (or pmd_trans_huge) is still mapping the page.
93 */
94static inline void get_page_foll(struct page *page)
95{
96 if (unlikely(PageTail(page)))
97 /*
98 * This is safe only because
99 * __split_huge_page_refcount() can't run under
100 * get_page_foll() because we hold the proper PT lock.
101 */
102 __get_page_tail_foll(page, true);
103 else {
104 /*
105 * Getting a normal page or the head of a compound page
106 * requires to already have an elevated page->_count.
107 */
Sasha Levin309381fea2014-01-23 15:52:54 -0800108 VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
Andrea Arcangeli70b50f92011-11-02 13:36:59 -0700109 atomic_inc(&page->_count);
110 }
111}
112
Hugh Dickins03f64622009-09-21 17:03:35 -0700113extern unsigned long highest_memmap_pfn;
114
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700115/*
116 * in mm/vmscan.c:
117 */
Nick Piggin62695a82008-10-18 20:26:09 -0700118extern int isolate_lru_page(struct page *page);
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700119extern void putback_lru_page(struct page *page);
Lisa Du6e543d52013-09-11 14:22:36 -0700120extern bool zone_reclaimable(struct zone *zone);
Nick Piggin62695a82008-10-18 20:26:09 -0700121
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700122/*
Bob Liu62190492012-12-11 16:00:37 -0800123 * in mm/rmap.c:
124 */
125extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
126
127/*
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700128 * in mm/page_alloc.c
129 */
Joonsoo Kim3c605092014-11-13 15:19:21 -0800130
131/*
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -0800132 * Structure for holding the mostly immutable allocation parameters passed
133 * between functions involved in allocations, including the alloc_pages*
134 * family of functions.
135 *
136 * nodemask, migratetype and high_zoneidx are initialized only once in
137 * __alloc_pages_nodemask() and then never change.
138 *
139 * zonelist, preferred_zone and classzone_idx are set first in
140 * __alloc_pages_nodemask() for the fast path, and might be later changed
141 * in __alloc_pages_slowpath(). All other functions pass the whole strucure
142 * by a const pointer.
143 */
144struct alloc_context {
145 struct zonelist *zonelist;
146 nodemask_t *nodemask;
147 struct zone *preferred_zone;
148 int classzone_idx;
149 int migratetype;
150 enum zone_type high_zoneidx;
Mel Gormanc9ab0c42015-11-06 16:28:12 -0800151 bool spread_dirty_pages;
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -0800152};
153
154/*
Joonsoo Kim3c605092014-11-13 15:19:21 -0800155 * Locate the struct page for both the matching buddy in our
156 * pair (buddy1) and the combined O(n+1) page they form (page).
157 *
158 * 1) Any buddy B1 will have an order O twin B2 which satisfies
159 * the following equation:
160 * B2 = B1 ^ (1 << O)
161 * For example, if the starting buddy (buddy2) is #8 its order
162 * 1 buddy is #10:
163 * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10
164 *
165 * 2) Any buddy B will have an order O+1 parent P which
166 * satisfies the following equation:
167 * P = B & ~(1 << O)
168 *
169 * Assumption: *_mem_map is contiguous at least up to MAX_ORDER
170 */
171static inline unsigned long
172__find_buddy_index(unsigned long page_idx, unsigned int order)
173{
174 return page_idx ^ (1 << order);
175}
176
177extern int __isolate_free_page(struct page *page, unsigned int order);
Mel Gormand70ddd72015-06-30 14:56:52 -0700178extern void __free_pages_bootmem(struct page *page, unsigned long pfn,
179 unsigned int order);
Kirill A. Shutemovd00181b2015-11-06 16:29:57 -0800180extern void prep_compound_page(struct page *page, unsigned int order);
Wu Fengguang8d22ba12009-12-16 12:19:58 +0100181#ifdef CONFIG_MEMORY_FAILURE
182extern bool is_free_buddy_page(struct page *page);
183#endif
Han Pingtian42aa83c2014-01-23 15:53:28 -0800184extern int user_min_free_kbytes;
Wu Fengguang20a03072009-06-16 15:32:22 -0700185
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100186#if defined CONFIG_COMPACTION || defined CONFIG_CMA
187
188/*
189 * in mm/compaction.c
190 */
191/*
192 * compact_control is used to track pages being migrated and the free pages
193 * they are being migrated to during memory compaction. The free_pfn starts
194 * at the end of a zone and migrate_pfn begins at the start. Movable pages
195 * are moved to the end of a zone during a compaction run and the run
196 * completes when free_pfn <= migrate_pfn
197 */
198struct compact_control {
199 struct list_head freepages; /* List of free pages to migrate to */
200 struct list_head migratepages; /* List of pages being migrated */
201 unsigned long nr_freepages; /* Number of isolated free pages */
202 unsigned long nr_migratepages; /* Number of pages to migrate */
203 unsigned long free_pfn; /* isolate_freepages search base */
204 unsigned long migrate_pfn; /* isolate_migratepages search base */
Joonsoo Kim1a167182015-09-08 15:03:59 -0700205 unsigned long last_migrated_pfn;/* Not yet flushed page being freed */
David Rientjese0b9dae2014-06-04 16:08:28 -0700206 enum migrate_mode mode; /* Async or sync migration mode */
Mel Gormanbb13ffe2012-10-08 16:32:41 -0700207 bool ignore_skip_hint; /* Scan blocks even if marked skip */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100208 int order; /* order a direct compactor needs */
David Rientjes6d7ce552014-10-09 15:27:27 -0700209 const gfp_t gfp_mask; /* gfp mask of a direct compactor */
Vlastimil Babkaebff3982014-12-10 15:43:22 -0800210 const int alloc_flags; /* alloc flags of a direct compactor */
211 const int classzone_idx; /* zone index of a direct compactor */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100212 struct zone *zone;
Vlastimil Babka1f9efde2014-10-09 15:27:14 -0700213 int contended; /* Signal need_sched() or lock
214 * contention detected during
Vlastimil Babkabe976572014-06-04 16:10:41 -0700215 * compaction
216 */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100217};
218
219unsigned long
Mel Gormanbb13ffe2012-10-08 16:32:41 -0700220isolate_freepages_range(struct compact_control *cc,
221 unsigned long start_pfn, unsigned long end_pfn);
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100222unsigned long
Vlastimil Babkaedc2ca62014-10-09 15:27:09 -0700223isolate_migratepages_range(struct compact_control *cc,
224 unsigned long low_pfn, unsigned long end_pfn);
Joonsoo Kim2149cda2015-04-14 15:45:21 -0700225int find_suitable_fallback(struct free_area *area, unsigned int order,
226 int migratetype, bool only_stealable, bool *can_steal);
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100227
228#endif
Nick Piggin0f8053a2006-03-22 00:08:33 -0800229
Mel Gorman48f13bf2007-10-16 01:26:10 -0700230/*
Mel Gorman6c144662014-01-23 15:53:38 -0800231 * This function returns the order of a free page in the buddy system. In
232 * general, page_zone(page)->lock must be held by the caller to prevent the
233 * page from being allocated in parallel and returning garbage as the order.
234 * If a caller does not hold page_zone(page)->lock, it must guarantee that the
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700235 * page cannot be allocated or merged in parallel. Alternatively, it must
236 * handle invalid values gracefully, and use page_order_unsafe() below.
Mel Gorman48f13bf2007-10-16 01:26:10 -0700237 */
Kirill A. Shutemovd00181b2015-11-06 16:29:57 -0800238static inline unsigned int page_order(struct page *page)
Mel Gorman48f13bf2007-10-16 01:26:10 -0700239{
KAMEZAWA Hiroyuki572438f2010-10-26 14:22:08 -0700240 /* PageBuddy() must be checked by the caller */
Mel Gorman48f13bf2007-10-16 01:26:10 -0700241 return page_private(page);
242}
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800243
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700244/*
245 * Like page_order(), but for callers who cannot afford to hold the zone lock.
246 * PageBuddy() should be checked first by the caller to minimize race window,
247 * and invalid values must be handled gracefully.
248 *
Jason Low4db0c3c2015-04-15 16:14:08 -0700249 * READ_ONCE is used so that if the caller assigns the result into a local
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700250 * variable and e.g. tests it for valid range before using, the compiler cannot
251 * decide to remove the variable and inline the page_private(page) multiple
252 * times, potentially observing different values in the tests and the actual
253 * use of the result.
254 */
Jason Low4db0c3c2015-04-15 16:14:08 -0700255#define page_order_unsafe(page) READ_ONCE(page_private(page))
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700256
Kirill A. Shutemov4bbd4c72014-06-04 16:08:10 -0700257static inline bool is_cow_mapping(vm_flags_t flags)
258{
259 return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
260}
261
Namhyung Kim6038def2011-05-24 17:11:22 -0700262/* mm/util.c */
263void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
264 struct vm_area_struct *prev, struct rb_node *rb_parent);
265
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800266#ifdef CONFIG_MMU
Kirill A. Shutemovfc05f562015-04-14 15:44:39 -0700267extern long populate_vma_page_range(struct vm_area_struct *vma,
Michel Lespinassecea10a12013-02-22 16:32:44 -0800268 unsigned long start, unsigned long end, int *nonblocking);
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800269extern void munlock_vma_pages_range(struct vm_area_struct *vma,
270 unsigned long start, unsigned long end);
271static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
272{
273 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
274}
275
Nick Pigginb291f002008-10-18 20:26:44 -0700276/*
Hugh Dickins73848b42009-12-14 17:59:22 -0800277 * must be called with vma's mmap_sem held for read or write, and page locked.
Nick Pigginb291f002008-10-18 20:26:44 -0700278 */
279extern void mlock_vma_page(struct page *page);
Michel Lespinasseff6a6da2013-02-27 17:02:44 -0800280extern unsigned int munlock_vma_page(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700281
282/*
283 * Clear the page's PageMlocked(). This can be useful in a situation where
284 * we want to unconditionally remove a page from the pagecache -- e.g.,
285 * on truncation or freeing.
286 *
287 * It is legal to call this function for any page, mlocked or not.
288 * If called for a page that is still mapped by mlocked vmas, all we do
289 * is revert to lazy LRU behaviour -- semantics are not broken.
290 */
Hugh Dickinse6c509f2012-10-08 16:33:19 -0700291extern void clear_page_mlock(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700292
293/*
Hugh Dickins51afb122015-11-05 18:49:37 -0800294 * mlock_migrate_page - called only from migrate_misplaced_transhuge_page()
295 * (because that does not go through the full procedure of migration ptes):
296 * to migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700297 */
298static inline void mlock_migrate_page(struct page *newpage, struct page *page)
299{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700300 if (TestClearPageMlocked(page)) {
Mel Gormanb32967f2012-11-19 12:35:47 +0000301 int nr_pages = hpage_nr_pages(page);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700302
Hugh Dickins51afb122015-11-05 18:49:37 -0800303 /* Holding pmd lock, no change in irq context: __mod is safe */
Mel Gormanb32967f2012-11-19 12:35:47 +0000304 __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
Nick Pigginb291f002008-10-18 20:26:44 -0700305 SetPageMlocked(newpage);
Mel Gormanb32967f2012-11-19 12:35:47 +0000306 __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700307 }
Nick Pigginb291f002008-10-18 20:26:44 -0700308}
309
Mel Gormanb32967f2012-11-19 12:35:47 +0000310extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
311
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800312#ifdef CONFIG_TRANSPARENT_HUGEPAGE
313extern unsigned long vma_address(struct page *page,
314 struct vm_area_struct *vma);
315#endif
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800316#else /* !CONFIG_MMU */
Nick Pigginb291f002008-10-18 20:26:44 -0700317static inline void clear_page_mlock(struct page *page) { }
318static inline void mlock_vma_page(struct page *page) { }
319static inline void mlock_migrate_page(struct page *new, struct page *old) { }
320
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800321#endif /* !CONFIG_MMU */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700322
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800323/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800324 * Return the mem_map entry representing the 'offset' subpage within
325 * the maximally aligned gigantic page 'base'. Handle any discontiguity
326 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
327 */
328static inline struct page *mem_map_offset(struct page *base, int offset)
329{
330 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
Fabian Frederickbc7f84c2014-08-06 16:05:17 -0700331 return nth_page(base, offset);
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800332 return base + offset;
333}
334
335/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300336 * Iterator over all subpages within the maximally aligned gigantic
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800337 * page 'base'. Handle any discontiguity in the mem_map.
338 */
339static inline struct page *mem_map_next(struct page *iter,
340 struct page *base, int offset)
341{
342 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
343 unsigned long pfn = page_to_pfn(base) + offset;
344 if (!pfn_valid(pfn))
345 return NULL;
346 return pfn_to_page(pfn);
347 }
348 return iter + 1;
349}
350
351/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800352 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
353 * so all functions starting at paging_init should be marked __init
354 * in those cases. SPARSEMEM, however, allows for memory hotplug,
355 * and alloc_bootmem_node is not used.
356 */
357#ifdef CONFIG_SPARSEMEM
358#define __paginginit __meminit
359#else
360#define __paginginit __init
361#endif
362
Mel Gorman6b74ab92008-07-23 21:26:49 -0700363/* Memory initialisation debug and verification */
364enum mminit_level {
365 MMINIT_WARNING,
366 MMINIT_VERIFY,
367 MMINIT_TRACE
368};
369
370#ifdef CONFIG_DEBUG_MEMORY_INIT
371
372extern int mminit_loglevel;
373
374#define mminit_dprintk(level, prefix, fmt, arg...) \
375do { \
376 if (level < mminit_loglevel) { \
Rasmus Villemoesfc5199d2015-02-12 15:00:02 -0800377 if (level <= MMINIT_WARNING) \
378 printk(KERN_WARNING "mminit::" prefix " " fmt, ##arg); \
379 else \
380 printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
Mel Gorman6b74ab92008-07-23 21:26:49 -0700381 } \
382} while (0)
383
Mel Gorman708614e2008-07-23 21:26:51 -0700384extern void mminit_verify_pageflags_layout(void);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700385extern void mminit_verify_zonelist(void);
Mel Gorman6b74ab92008-07-23 21:26:49 -0700386#else
387
388static inline void mminit_dprintk(enum mminit_level level,
389 const char *prefix, const char *fmt, ...)
390{
391}
392
Mel Gorman708614e2008-07-23 21:26:51 -0700393static inline void mminit_verify_pageflags_layout(void)
394{
395}
396
Mel Gorman68ad8df2008-07-23 21:26:52 -0700397static inline void mminit_verify_zonelist(void)
398{
399}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700400#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700401
402/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
403#if defined(CONFIG_SPARSEMEM)
404extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
405 unsigned long *end_pfn);
406#else
407static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
408 unsigned long *end_pfn)
409{
410}
411#endif /* CONFIG_SPARSEMEM */
412
Mel Gormanfa5e0842009-06-16 15:33:22 -0700413#define ZONE_RECLAIM_NOSCAN -2
414#define ZONE_RECLAIM_FULL -1
415#define ZONE_RECLAIM_SOME 0
416#define ZONE_RECLAIM_SUCCESS 1
Wu Fengguang7c116f22009-12-16 12:19:59 +0100417
Wu Fengguang31d3d342009-12-16 12:19:59 +0100418extern int hwpoison_filter(struct page *p);
419
Wu Fengguang7c116f22009-12-16 12:19:59 +0100420extern u32 hwpoison_filter_dev_major;
421extern u32 hwpoison_filter_dev_minor;
Wu Fengguang478c5ff2009-12-16 12:19:59 +0100422extern u64 hwpoison_filter_flags_mask;
423extern u64 hwpoison_filter_flags_value;
Andi Kleen4fd466e2009-12-16 12:19:59 +0100424extern u64 hwpoison_filter_memcg;
Haicheng Li1bfe5fe2009-12-16 12:19:59 +0100425extern u32 hwpoison_filter_enable;
Al Viroeb36c582012-05-30 20:17:35 -0400426
427extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,
428 unsigned long, unsigned long,
429 unsigned long, unsigned long);
Xishi Qiuca57df72012-07-31 16:43:19 -0700430
431extern void set_pageblock_order(void);
Minchan Kim02c6de82012-10-08 16:31:55 -0700432unsigned long reclaim_clean_pages_from_list(struct zone *zone,
433 struct list_head *page_list);
Bartlomiej Zolnierkiewiczd95ea5d2012-10-08 16:32:05 -0700434/* The ALLOC_WMARK bits are used as an index to zone->watermark */
435#define ALLOC_WMARK_MIN WMARK_MIN
436#define ALLOC_WMARK_LOW WMARK_LOW
437#define ALLOC_WMARK_HIGH WMARK_HIGH
438#define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
439
440/* Mask to get the watermark bits */
441#define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
442
443#define ALLOC_HARDER 0x10 /* try to alloc harder */
444#define ALLOC_HIGH 0x20 /* __GFP_HIGH set */
445#define ALLOC_CPUSET 0x40 /* check for correct cpuset */
446#define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
Johannes Weiner3a025762014-04-07 15:37:48 -0700447#define ALLOC_FAIR 0x100 /* fair zone allocation */
Bartlomiej Zolnierkiewiczd95ea5d2012-10-08 16:32:05 -0700448
Mel Gorman72b252a2015-09-04 15:47:32 -0700449enum ttu_flags;
450struct tlbflush_unmap_batch;
451
452#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
453void try_to_unmap_flush(void);
Mel Gormand950c942015-09-04 15:47:35 -0700454void try_to_unmap_flush_dirty(void);
Mel Gorman72b252a2015-09-04 15:47:32 -0700455#else
456static inline void try_to_unmap_flush(void)
457{
458}
Mel Gormand950c942015-09-04 15:47:35 -0700459static inline void try_to_unmap_flush_dirty(void)
460{
461}
Mel Gorman72b252a2015-09-04 15:47:32 -0700462
463#endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
Michel Lespinassedb971412012-10-08 16:29:34 -0700464#endif /* __MM_INTERNAL_H */