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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
Fabian Frederick29f175d2014-04-07 15:37:55 -070014#include <linux/fs.h>
Nick Piggin0f8053a2006-03-22 00:08:33 -080015#include <linux/mm.h>
Kirill A. Shutemove9b61f12016-01-15 16:54:10 -080016#include <linux/pagemap.h>
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -070017#include <linux/tracepoint-defs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Mel Gormandd56b042015-11-06 16:28:43 -080019/*
20 * The set of flags that only affect watermark checking and reclaim
21 * behaviour. This is used by the MM to obey the caller constraints
22 * about IO, FS and watermark checking while ignoring placement
23 * hints such as HIGHMEM usage.
24 */
25#define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\
26 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
27 __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC)
28
29/* The GFP flags allowed during early boot */
30#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS))
31
32/* Control allocation cpuset and node placement constraints */
33#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
34
35/* Do not use these with a slab allocator */
36#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
37
Jan Beulich42b77722008-07-23 21:27:10 -070038void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
39 unsigned long floor, unsigned long ceiling);
40
Michal Hockoaac45362016-03-25 14:20:24 -070041void unmap_page_range(struct mmu_gather *tlb,
42 struct vm_area_struct *vma,
43 unsigned long addr, unsigned long end,
44 struct zap_details *details);
45
Fabian Frederick29f175d2014-04-07 15:37:55 -070046extern int __do_page_cache_readahead(struct address_space *mapping,
47 struct file *filp, pgoff_t offset, unsigned long nr_to_read,
48 unsigned long lookahead_size);
49
50/*
51 * Submit IO for the read-ahead request in file_ra_state.
52 */
53static inline unsigned long ra_submit(struct file_ra_state *ra,
54 struct address_space *mapping, struct file *filp)
55{
56 return __do_page_cache_readahead(mapping, filp,
57 ra->start, ra->size, ra->async_size);
58}
59
Nick Piggin7835e982006-03-22 00:08:40 -080060/*
Joonsoo Kim0139aa72016-05-19 17:10:49 -070061 * Turn a non-refcounted page (->_refcount == 0) into refcounted with
Nick Piggin7835e982006-03-22 00:08:40 -080062 * a count of one.
63 */
64static inline void set_page_refcounted(struct page *page)
65{
Sasha Levin309381fea2014-01-23 15:52:54 -080066 VM_BUG_ON_PAGE(PageTail(page), page);
Joonsoo Kimfe896d12016-03-17 14:19:26 -070067 VM_BUG_ON_PAGE(page_ref_count(page), page);
Nick Piggin77a8a782006-01-06 00:10:57 -080068 set_page_count(page, 1);
Nick Piggin77a8a782006-01-06 00:10:57 -080069}
70
Hugh Dickins03f64622009-09-21 17:03:35 -070071extern unsigned long highest_memmap_pfn;
72
Lee Schermerhorn894bc312008-10-18 20:26:39 -070073/*
74 * in mm/vmscan.c:
75 */
Nick Piggin62695a82008-10-18 20:26:09 -070076extern int isolate_lru_page(struct page *page);
Lee Schermerhorn894bc312008-10-18 20:26:39 -070077extern void putback_lru_page(struct page *page);
Lisa Du6e543d52013-09-11 14:22:36 -070078extern bool zone_reclaimable(struct zone *zone);
Nick Piggin62695a82008-10-18 20:26:09 -070079
Lee Schermerhorn894bc312008-10-18 20:26:39 -070080/*
Bob Liu62190492012-12-11 16:00:37 -080081 * in mm/rmap.c:
82 */
83extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
84
85/*
Lee Schermerhorn894bc312008-10-18 20:26:39 -070086 * in mm/page_alloc.c
87 */
Joonsoo Kim3c605092014-11-13 15:19:21 -080088
89/*
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -080090 * Structure for holding the mostly immutable allocation parameters passed
91 * between functions involved in allocations, including the alloc_pages*
92 * family of functions.
93 *
94 * nodemask, migratetype and high_zoneidx are initialized only once in
95 * __alloc_pages_nodemask() and then never change.
96 *
97 * zonelist, preferred_zone and classzone_idx are set first in
98 * __alloc_pages_nodemask() for the fast path, and might be later changed
99 * in __alloc_pages_slowpath(). All other functions pass the whole strucure
100 * by a const pointer.
101 */
102struct alloc_context {
103 struct zonelist *zonelist;
104 nodemask_t *nodemask;
Mel Gormanc33d6c02016-05-19 17:14:10 -0700105 struct zoneref *preferred_zoneref;
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -0800106 int migratetype;
107 enum zone_type high_zoneidx;
Mel Gormanc9ab0c42015-11-06 16:28:12 -0800108 bool spread_dirty_pages;
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -0800109};
110
Mel Gorman93ea9962016-05-19 17:14:13 -0700111#define ac_classzone_idx(ac) zonelist_zone_idx(ac->preferred_zoneref)
112
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -0800113/*
Joonsoo Kim3c605092014-11-13 15:19:21 -0800114 * Locate the struct page for both the matching buddy in our
115 * pair (buddy1) and the combined O(n+1) page they form (page).
116 *
117 * 1) Any buddy B1 will have an order O twin B2 which satisfies
118 * the following equation:
119 * B2 = B1 ^ (1 << O)
120 * For example, if the starting buddy (buddy2) is #8 its order
121 * 1 buddy is #10:
122 * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10
123 *
124 * 2) Any buddy B will have an order O+1 parent P which
125 * satisfies the following equation:
126 * P = B & ~(1 << O)
127 *
128 * Assumption: *_mem_map is contiguous at least up to MAX_ORDER
129 */
130static inline unsigned long
131__find_buddy_index(unsigned long page_idx, unsigned int order)
132{
133 return page_idx ^ (1 << order);
134}
135
Joonsoo Kim7cf91a92016-03-15 14:57:51 -0700136extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
137 unsigned long end_pfn, struct zone *zone);
138
139static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn,
140 unsigned long end_pfn, struct zone *zone)
141{
142 if (zone->contiguous)
143 return pfn_to_page(start_pfn);
144
145 return __pageblock_pfn_to_page(start_pfn, end_pfn, zone);
146}
147
Joonsoo Kim3c605092014-11-13 15:19:21 -0800148extern int __isolate_free_page(struct page *page, unsigned int order);
Mel Gormand70ddd72015-06-30 14:56:52 -0700149extern void __free_pages_bootmem(struct page *page, unsigned long pfn,
150 unsigned int order);
Kirill A. Shutemovd00181b2015-11-06 16:29:57 -0800151extern void prep_compound_page(struct page *page, unsigned int order);
Han Pingtian42aa83c2014-01-23 15:53:28 -0800152extern int user_min_free_kbytes;
Wu Fengguang20a03072009-06-16 15:32:22 -0700153
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100154#if defined CONFIG_COMPACTION || defined CONFIG_CMA
155
156/*
157 * in mm/compaction.c
158 */
159/*
160 * compact_control is used to track pages being migrated and the free pages
161 * they are being migrated to during memory compaction. The free_pfn starts
162 * at the end of a zone and migrate_pfn begins at the start. Movable pages
163 * are moved to the end of a zone during a compaction run and the run
164 * completes when free_pfn <= migrate_pfn
165 */
166struct compact_control {
167 struct list_head freepages; /* List of free pages to migrate to */
168 struct list_head migratepages; /* List of pages being migrated */
169 unsigned long nr_freepages; /* Number of isolated free pages */
170 unsigned long nr_migratepages; /* Number of pages to migrate */
171 unsigned long free_pfn; /* isolate_freepages search base */
172 unsigned long migrate_pfn; /* isolate_migratepages search base */
Joonsoo Kim1a167182015-09-08 15:03:59 -0700173 unsigned long last_migrated_pfn;/* Not yet flushed page being freed */
David Rientjese0b9dae2014-06-04 16:08:28 -0700174 enum migrate_mode mode; /* Async or sync migration mode */
Mel Gormanbb13ffe2012-10-08 16:32:41 -0700175 bool ignore_skip_hint; /* Scan blocks even if marked skip */
Vlastimil Babkaaccf6242016-03-17 14:18:15 -0700176 bool direct_compaction; /* False from kcompactd or /proc/... */
Michal Hockoc8f7de02016-05-20 16:56:47 -0700177 bool whole_zone; /* Whole zone has been scanned */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100178 int order; /* order a direct compactor needs */
David Rientjes6d7ce552014-10-09 15:27:27 -0700179 const gfp_t gfp_mask; /* gfp mask of a direct compactor */
Mel Gormanc6038442016-05-19 17:13:38 -0700180 const unsigned int alloc_flags; /* alloc flags of a direct compactor */
Vlastimil Babkaebff3982014-12-10 15:43:22 -0800181 const int classzone_idx; /* zone index of a direct compactor */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100182 struct zone *zone;
Vlastimil Babka1f9efde2014-10-09 15:27:14 -0700183 int contended; /* Signal need_sched() or lock
184 * contention detected during
Vlastimil Babkabe976572014-06-04 16:10:41 -0700185 * compaction
186 */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100187};
188
189unsigned long
Mel Gormanbb13ffe2012-10-08 16:32:41 -0700190isolate_freepages_range(struct compact_control *cc,
191 unsigned long start_pfn, unsigned long end_pfn);
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100192unsigned long
Vlastimil Babkaedc2ca62014-10-09 15:27:09 -0700193isolate_migratepages_range(struct compact_control *cc,
194 unsigned long low_pfn, unsigned long end_pfn);
Joonsoo Kim2149cda2015-04-14 15:45:21 -0700195int find_suitable_fallback(struct free_area *area, unsigned int order,
196 int migratetype, bool only_stealable, bool *can_steal);
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100197
198#endif
Nick Piggin0f8053a2006-03-22 00:08:33 -0800199
Mel Gorman48f13bf2007-10-16 01:26:10 -0700200/*
Mel Gorman6c144662014-01-23 15:53:38 -0800201 * This function returns the order of a free page in the buddy system. In
202 * general, page_zone(page)->lock must be held by the caller to prevent the
203 * page from being allocated in parallel and returning garbage as the order.
204 * If a caller does not hold page_zone(page)->lock, it must guarantee that the
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700205 * page cannot be allocated or merged in parallel. Alternatively, it must
206 * handle invalid values gracefully, and use page_order_unsafe() below.
Mel Gorman48f13bf2007-10-16 01:26:10 -0700207 */
Kirill A. Shutemovd00181b2015-11-06 16:29:57 -0800208static inline unsigned int page_order(struct page *page)
Mel Gorman48f13bf2007-10-16 01:26:10 -0700209{
KAMEZAWA Hiroyuki572438f2010-10-26 14:22:08 -0700210 /* PageBuddy() must be checked by the caller */
Mel Gorman48f13bf2007-10-16 01:26:10 -0700211 return page_private(page);
212}
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800213
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700214/*
215 * Like page_order(), but for callers who cannot afford to hold the zone lock.
216 * PageBuddy() should be checked first by the caller to minimize race window,
217 * and invalid values must be handled gracefully.
218 *
Jason Low4db0c3c2015-04-15 16:14:08 -0700219 * READ_ONCE is used so that if the caller assigns the result into a local
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700220 * variable and e.g. tests it for valid range before using, the compiler cannot
221 * decide to remove the variable and inline the page_private(page) multiple
222 * times, potentially observing different values in the tests and the actual
223 * use of the result.
224 */
Jason Low4db0c3c2015-04-15 16:14:08 -0700225#define page_order_unsafe(page) READ_ONCE(page_private(page))
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700226
Kirill A. Shutemov4bbd4c72014-06-04 16:08:10 -0700227static inline bool is_cow_mapping(vm_flags_t flags)
228{
229 return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
230}
231
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800232/*
233 * These three helpers classifies VMAs for virtual memory accounting.
234 */
235
236/*
237 * Executable code area - executable, not writable, not stack
238 */
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800239static inline bool is_exec_mapping(vm_flags_t flags)
240{
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800241 return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC;
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800242}
243
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800244/*
245 * Stack area - atomatically grows in one direction
246 *
247 * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
248 * do_mmap() forbids all other combinations.
249 */
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800250static inline bool is_stack_mapping(vm_flags_t flags)
251{
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800252 return (flags & VM_STACK) == VM_STACK;
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800253}
254
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800255/*
256 * Data area - private, writable, not stack
257 */
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800258static inline bool is_data_mapping(vm_flags_t flags)
259{
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800260 return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE;
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800261}
262
Namhyung Kim6038def2011-05-24 17:11:22 -0700263/* mm/util.c */
264void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
265 struct vm_area_struct *prev, struct rb_node *rb_parent);
266
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800267#ifdef CONFIG_MMU
Kirill A. Shutemovfc05f562015-04-14 15:44:39 -0700268extern long populate_vma_page_range(struct vm_area_struct *vma,
Michel Lespinassecea10a12013-02-22 16:32:44 -0800269 unsigned long start, unsigned long end, int *nonblocking);
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800270extern void munlock_vma_pages_range(struct vm_area_struct *vma,
271 unsigned long start, unsigned long end);
272static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
273{
274 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
275}
276
Nick Pigginb291f002008-10-18 20:26:44 -0700277/*
Hugh Dickins73848b42009-12-14 17:59:22 -0800278 * must be called with vma's mmap_sem held for read or write, and page locked.
Nick Pigginb291f002008-10-18 20:26:44 -0700279 */
280extern void mlock_vma_page(struct page *page);
Michel Lespinasseff6a6da2013-02-27 17:02:44 -0800281extern unsigned int munlock_vma_page(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700282
283/*
284 * Clear the page's PageMlocked(). This can be useful in a situation where
285 * we want to unconditionally remove a page from the pagecache -- e.g.,
286 * on truncation or freeing.
287 *
288 * It is legal to call this function for any page, mlocked or not.
289 * If called for a page that is still mapped by mlocked vmas, all we do
290 * is revert to lazy LRU behaviour -- semantics are not broken.
291 */
Hugh Dickinse6c509f2012-10-08 16:33:19 -0700292extern void clear_page_mlock(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700293
294/*
Hugh Dickins51afb122015-11-05 18:49:37 -0800295 * mlock_migrate_page - called only from migrate_misplaced_transhuge_page()
296 * (because that does not go through the full procedure of migration ptes):
297 * to migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700298 */
299static inline void mlock_migrate_page(struct page *newpage, struct page *page)
300{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700301 if (TestClearPageMlocked(page)) {
Mel Gormanb32967f2012-11-19 12:35:47 +0000302 int nr_pages = hpage_nr_pages(page);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700303
Hugh Dickins51afb122015-11-05 18:49:37 -0800304 /* Holding pmd lock, no change in irq context: __mod is safe */
Mel Gormanb32967f2012-11-19 12:35:47 +0000305 __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
Nick Pigginb291f002008-10-18 20:26:44 -0700306 SetPageMlocked(newpage);
Mel Gormanb32967f2012-11-19 12:35:47 +0000307 __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700308 }
Nick Pigginb291f002008-10-18 20:26:44 -0700309}
310
Mel Gormanb32967f2012-11-19 12:35:47 +0000311extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
312
Kirill A. Shutemove9b61f12016-01-15 16:54:10 -0800313/*
314 * At what user virtual address is page expected in @vma?
315 */
316static inline unsigned long
317__vma_address(struct page *page, struct vm_area_struct *vma)
318{
319 pgoff_t pgoff = page_to_pgoff(page);
320 return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
321}
322
323static inline unsigned long
324vma_address(struct page *page, struct vm_area_struct *vma)
325{
326 unsigned long address = __vma_address(page, vma);
327
328 /* page should be within @vma mapping range */
329 VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma);
330
331 return address;
332}
333
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800334#else /* !CONFIG_MMU */
Nick Pigginb291f002008-10-18 20:26:44 -0700335static inline void clear_page_mlock(struct page *page) { }
336static inline void mlock_vma_page(struct page *page) { }
337static inline void mlock_migrate_page(struct page *new, struct page *old) { }
338
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800339#endif /* !CONFIG_MMU */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700340
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800341/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800342 * Return the mem_map entry representing the 'offset' subpage within
343 * the maximally aligned gigantic page 'base'. Handle any discontiguity
344 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
345 */
346static inline struct page *mem_map_offset(struct page *base, int offset)
347{
348 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
Fabian Frederickbc7f84c2014-08-06 16:05:17 -0700349 return nth_page(base, offset);
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800350 return base + offset;
351}
352
353/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300354 * Iterator over all subpages within the maximally aligned gigantic
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800355 * page 'base'. Handle any discontiguity in the mem_map.
356 */
357static inline struct page *mem_map_next(struct page *iter,
358 struct page *base, int offset)
359{
360 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
361 unsigned long pfn = page_to_pfn(base) + offset;
362 if (!pfn_valid(pfn))
363 return NULL;
364 return pfn_to_page(pfn);
365 }
366 return iter + 1;
367}
368
369/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800370 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
371 * so all functions starting at paging_init should be marked __init
372 * in those cases. SPARSEMEM, however, allows for memory hotplug,
373 * and alloc_bootmem_node is not used.
374 */
375#ifdef CONFIG_SPARSEMEM
376#define __paginginit __meminit
377#else
378#define __paginginit __init
379#endif
380
Mel Gorman6b74ab92008-07-23 21:26:49 -0700381/* Memory initialisation debug and verification */
382enum mminit_level {
383 MMINIT_WARNING,
384 MMINIT_VERIFY,
385 MMINIT_TRACE
386};
387
388#ifdef CONFIG_DEBUG_MEMORY_INIT
389
390extern int mminit_loglevel;
391
392#define mminit_dprintk(level, prefix, fmt, arg...) \
393do { \
394 if (level < mminit_loglevel) { \
Rasmus Villemoesfc5199d2015-02-12 15:00:02 -0800395 if (level <= MMINIT_WARNING) \
Joe Perches11705322016-03-17 14:19:50 -0700396 pr_warn("mminit::" prefix " " fmt, ##arg); \
Rasmus Villemoesfc5199d2015-02-12 15:00:02 -0800397 else \
398 printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
Mel Gorman6b74ab92008-07-23 21:26:49 -0700399 } \
400} while (0)
401
Mel Gorman708614e2008-07-23 21:26:51 -0700402extern void mminit_verify_pageflags_layout(void);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700403extern void mminit_verify_zonelist(void);
Mel Gorman6b74ab92008-07-23 21:26:49 -0700404#else
405
406static inline void mminit_dprintk(enum mminit_level level,
407 const char *prefix, const char *fmt, ...)
408{
409}
410
Mel Gorman708614e2008-07-23 21:26:51 -0700411static inline void mminit_verify_pageflags_layout(void)
412{
413}
414
Mel Gorman68ad8df2008-07-23 21:26:52 -0700415static inline void mminit_verify_zonelist(void)
416{
417}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700418#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700419
420/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
421#if defined(CONFIG_SPARSEMEM)
422extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
423 unsigned long *end_pfn);
424#else
425static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
426 unsigned long *end_pfn)
427{
428}
429#endif /* CONFIG_SPARSEMEM */
430
Mel Gormanfa5e0842009-06-16 15:33:22 -0700431#define ZONE_RECLAIM_NOSCAN -2
432#define ZONE_RECLAIM_FULL -1
433#define ZONE_RECLAIM_SOME 0
434#define ZONE_RECLAIM_SUCCESS 1
Wu Fengguang7c116f22009-12-16 12:19:59 +0100435
Wu Fengguang31d3d342009-12-16 12:19:59 +0100436extern int hwpoison_filter(struct page *p);
437
Wu Fengguang7c116f22009-12-16 12:19:59 +0100438extern u32 hwpoison_filter_dev_major;
439extern u32 hwpoison_filter_dev_minor;
Wu Fengguang478c5ff2009-12-16 12:19:59 +0100440extern u64 hwpoison_filter_flags_mask;
441extern u64 hwpoison_filter_flags_value;
Andi Kleen4fd466e2009-12-16 12:19:59 +0100442extern u64 hwpoison_filter_memcg;
Haicheng Li1bfe5fe2009-12-16 12:19:59 +0100443extern u32 hwpoison_filter_enable;
Al Viroeb36c582012-05-30 20:17:35 -0400444
Michal Hockodc0ef0d2016-05-23 16:25:27 -0700445extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long,
Al Viroeb36c582012-05-30 20:17:35 -0400446 unsigned long, unsigned long,
Michal Hocko9fbeb5a2016-05-23 16:25:30 -0700447 unsigned long, unsigned long);
Xishi Qiuca57df72012-07-31 16:43:19 -0700448
449extern void set_pageblock_order(void);
Minchan Kim02c6de82012-10-08 16:31:55 -0700450unsigned long reclaim_clean_pages_from_list(struct zone *zone,
451 struct list_head *page_list);
Bartlomiej Zolnierkiewiczd95ea5d2012-10-08 16:32:05 -0700452/* The ALLOC_WMARK bits are used as an index to zone->watermark */
453#define ALLOC_WMARK_MIN WMARK_MIN
454#define ALLOC_WMARK_LOW WMARK_LOW
455#define ALLOC_WMARK_HIGH WMARK_HIGH
456#define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
457
458/* Mask to get the watermark bits */
459#define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
460
461#define ALLOC_HARDER 0x10 /* try to alloc harder */
462#define ALLOC_HIGH 0x20 /* __GFP_HIGH set */
463#define ALLOC_CPUSET 0x40 /* check for correct cpuset */
464#define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
Johannes Weiner3a025762014-04-07 15:37:48 -0700465#define ALLOC_FAIR 0x100 /* fair zone allocation */
Bartlomiej Zolnierkiewiczd95ea5d2012-10-08 16:32:05 -0700466
Mel Gorman72b252a2015-09-04 15:47:32 -0700467enum ttu_flags;
468struct tlbflush_unmap_batch;
469
470#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
471void try_to_unmap_flush(void);
Mel Gormand950c942015-09-04 15:47:35 -0700472void try_to_unmap_flush_dirty(void);
Mel Gorman72b252a2015-09-04 15:47:32 -0700473#else
474static inline void try_to_unmap_flush(void)
475{
476}
Mel Gormand950c942015-09-04 15:47:35 -0700477static inline void try_to_unmap_flush_dirty(void)
478{
479}
Mel Gorman72b252a2015-09-04 15:47:32 -0700480
481#endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -0700482
483extern const struct trace_print_flags pageflag_names[];
484extern const struct trace_print_flags vmaflag_names[];
485extern const struct trace_print_flags gfpflag_names[];
486
Michel Lespinassedb971412012-10-08 16:29:34 -0700487#endif /* __MM_INTERNAL_H */