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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/*
61 * Turn a non-refcounted page (->_count == 0) into refcounted with
62 * 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;
105 struct zone *preferred_zone;
106 int classzone_idx;
107 int migratetype;
108 enum zone_type high_zoneidx;
Mel Gormanc9ab0c42015-11-06 16:28:12 -0800109 bool spread_dirty_pages;
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -0800110};
111
112/*
Joonsoo Kim3c605092014-11-13 15:19:21 -0800113 * Locate the struct page for both the matching buddy in our
114 * pair (buddy1) and the combined O(n+1) page they form (page).
115 *
116 * 1) Any buddy B1 will have an order O twin B2 which satisfies
117 * the following equation:
118 * B2 = B1 ^ (1 << O)
119 * For example, if the starting buddy (buddy2) is #8 its order
120 * 1 buddy is #10:
121 * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10
122 *
123 * 2) Any buddy B will have an order O+1 parent P which
124 * satisfies the following equation:
125 * P = B & ~(1 << O)
126 *
127 * Assumption: *_mem_map is contiguous at least up to MAX_ORDER
128 */
129static inline unsigned long
130__find_buddy_index(unsigned long page_idx, unsigned int order)
131{
132 return page_idx ^ (1 << order);
133}
134
Joonsoo Kim7cf91a92016-03-15 14:57:51 -0700135extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
136 unsigned long end_pfn, struct zone *zone);
137
138static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn,
139 unsigned long end_pfn, struct zone *zone)
140{
141 if (zone->contiguous)
142 return pfn_to_page(start_pfn);
143
144 return __pageblock_pfn_to_page(start_pfn, end_pfn, zone);
145}
146
Joonsoo Kim3c605092014-11-13 15:19:21 -0800147extern int __isolate_free_page(struct page *page, unsigned int order);
Mel Gormand70ddd72015-06-30 14:56:52 -0700148extern void __free_pages_bootmem(struct page *page, unsigned long pfn,
149 unsigned int order);
Kirill A. Shutemovd00181b2015-11-06 16:29:57 -0800150extern void prep_compound_page(struct page *page, unsigned int order);
Han Pingtian42aa83c2014-01-23 15:53:28 -0800151extern int user_min_free_kbytes;
Wu Fengguang20a03072009-06-16 15:32:22 -0700152
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100153#if defined CONFIG_COMPACTION || defined CONFIG_CMA
154
155/*
156 * in mm/compaction.c
157 */
158/*
159 * compact_control is used to track pages being migrated and the free pages
160 * they are being migrated to during memory compaction. The free_pfn starts
161 * at the end of a zone and migrate_pfn begins at the start. Movable pages
162 * are moved to the end of a zone during a compaction run and the run
163 * completes when free_pfn <= migrate_pfn
164 */
165struct compact_control {
166 struct list_head freepages; /* List of free pages to migrate to */
167 struct list_head migratepages; /* List of pages being migrated */
168 unsigned long nr_freepages; /* Number of isolated free pages */
169 unsigned long nr_migratepages; /* Number of pages to migrate */
170 unsigned long free_pfn; /* isolate_freepages search base */
171 unsigned long migrate_pfn; /* isolate_migratepages search base */
Joonsoo Kim1a167182015-09-08 15:03:59 -0700172 unsigned long last_migrated_pfn;/* Not yet flushed page being freed */
David Rientjese0b9dae2014-06-04 16:08:28 -0700173 enum migrate_mode mode; /* Async or sync migration mode */
Mel Gormanbb13ffe2012-10-08 16:32:41 -0700174 bool ignore_skip_hint; /* Scan blocks even if marked skip */
Vlastimil Babkaaccf6242016-03-17 14:18:15 -0700175 bool direct_compaction; /* False from kcompactd or /proc/... */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100176 int order; /* order a direct compactor needs */
David Rientjes6d7ce552014-10-09 15:27:27 -0700177 const gfp_t gfp_mask; /* gfp mask of a direct compactor */
Vlastimil Babkaebff3982014-12-10 15:43:22 -0800178 const int alloc_flags; /* alloc flags of a direct compactor */
179 const int classzone_idx; /* zone index of a direct compactor */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100180 struct zone *zone;
Vlastimil Babka1f9efde2014-10-09 15:27:14 -0700181 int contended; /* Signal need_sched() or lock
182 * contention detected during
Vlastimil Babkabe976572014-06-04 16:10:41 -0700183 * compaction
184 */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100185};
186
187unsigned long
Mel Gormanbb13ffe2012-10-08 16:32:41 -0700188isolate_freepages_range(struct compact_control *cc,
189 unsigned long start_pfn, unsigned long end_pfn);
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100190unsigned long
Vlastimil Babkaedc2ca62014-10-09 15:27:09 -0700191isolate_migratepages_range(struct compact_control *cc,
192 unsigned long low_pfn, unsigned long end_pfn);
Joonsoo Kim2149cda2015-04-14 15:45:21 -0700193int find_suitable_fallback(struct free_area *area, unsigned int order,
194 int migratetype, bool only_stealable, bool *can_steal);
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100195
196#endif
Nick Piggin0f8053a2006-03-22 00:08:33 -0800197
Mel Gorman48f13bf2007-10-16 01:26:10 -0700198/*
Mel Gorman6c144662014-01-23 15:53:38 -0800199 * This function returns the order of a free page in the buddy system. In
200 * general, page_zone(page)->lock must be held by the caller to prevent the
201 * page from being allocated in parallel and returning garbage as the order.
202 * If a caller does not hold page_zone(page)->lock, it must guarantee that the
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700203 * page cannot be allocated or merged in parallel. Alternatively, it must
204 * handle invalid values gracefully, and use page_order_unsafe() below.
Mel Gorman48f13bf2007-10-16 01:26:10 -0700205 */
Kirill A. Shutemovd00181b2015-11-06 16:29:57 -0800206static inline unsigned int page_order(struct page *page)
Mel Gorman48f13bf2007-10-16 01:26:10 -0700207{
KAMEZAWA Hiroyuki572438f2010-10-26 14:22:08 -0700208 /* PageBuddy() must be checked by the caller */
Mel Gorman48f13bf2007-10-16 01:26:10 -0700209 return page_private(page);
210}
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800211
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700212/*
213 * Like page_order(), but for callers who cannot afford to hold the zone lock.
214 * PageBuddy() should be checked first by the caller to minimize race window,
215 * and invalid values must be handled gracefully.
216 *
Jason Low4db0c3c2015-04-15 16:14:08 -0700217 * READ_ONCE is used so that if the caller assigns the result into a local
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700218 * variable and e.g. tests it for valid range before using, the compiler cannot
219 * decide to remove the variable and inline the page_private(page) multiple
220 * times, potentially observing different values in the tests and the actual
221 * use of the result.
222 */
Jason Low4db0c3c2015-04-15 16:14:08 -0700223#define page_order_unsafe(page) READ_ONCE(page_private(page))
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700224
Kirill A. Shutemov4bbd4c72014-06-04 16:08:10 -0700225static inline bool is_cow_mapping(vm_flags_t flags)
226{
227 return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
228}
229
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800230/*
231 * These three helpers classifies VMAs for virtual memory accounting.
232 */
233
234/*
235 * Executable code area - executable, not writable, not stack
236 */
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800237static inline bool is_exec_mapping(vm_flags_t flags)
238{
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800239 return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC;
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800240}
241
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800242/*
243 * Stack area - atomatically grows in one direction
244 *
245 * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
246 * do_mmap() forbids all other combinations.
247 */
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800248static inline bool is_stack_mapping(vm_flags_t flags)
249{
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800250 return (flags & VM_STACK) == VM_STACK;
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800251}
252
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800253/*
254 * Data area - private, writable, not stack
255 */
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800256static inline bool is_data_mapping(vm_flags_t flags)
257{
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800258 return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE;
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800259}
260
Namhyung Kim6038def2011-05-24 17:11:22 -0700261/* mm/util.c */
262void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
263 struct vm_area_struct *prev, struct rb_node *rb_parent);
264
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800265#ifdef CONFIG_MMU
Kirill A. Shutemovfc05f562015-04-14 15:44:39 -0700266extern long populate_vma_page_range(struct vm_area_struct *vma,
Michel Lespinassecea10a12013-02-22 16:32:44 -0800267 unsigned long start, unsigned long end, int *nonblocking);
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800268extern void munlock_vma_pages_range(struct vm_area_struct *vma,
269 unsigned long start, unsigned long end);
270static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
271{
272 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
273}
274
Nick Pigginb291f002008-10-18 20:26:44 -0700275/*
Hugh Dickins73848b42009-12-14 17:59:22 -0800276 * must be called with vma's mmap_sem held for read or write, and page locked.
Nick Pigginb291f002008-10-18 20:26:44 -0700277 */
278extern void mlock_vma_page(struct page *page);
Michel Lespinasseff6a6da2013-02-27 17:02:44 -0800279extern unsigned int munlock_vma_page(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700280
281/*
282 * Clear the page's PageMlocked(). This can be useful in a situation where
283 * we want to unconditionally remove a page from the pagecache -- e.g.,
284 * on truncation or freeing.
285 *
286 * It is legal to call this function for any page, mlocked or not.
287 * If called for a page that is still mapped by mlocked vmas, all we do
288 * is revert to lazy LRU behaviour -- semantics are not broken.
289 */
Hugh Dickinse6c509f2012-10-08 16:33:19 -0700290extern void clear_page_mlock(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700291
292/*
Hugh Dickins51afb122015-11-05 18:49:37 -0800293 * mlock_migrate_page - called only from migrate_misplaced_transhuge_page()
294 * (because that does not go through the full procedure of migration ptes):
295 * to migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700296 */
297static inline void mlock_migrate_page(struct page *newpage, struct page *page)
298{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700299 if (TestClearPageMlocked(page)) {
Mel Gormanb32967f2012-11-19 12:35:47 +0000300 int nr_pages = hpage_nr_pages(page);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700301
Hugh Dickins51afb122015-11-05 18:49:37 -0800302 /* Holding pmd lock, no change in irq context: __mod is safe */
Mel Gormanb32967f2012-11-19 12:35:47 +0000303 __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
Nick Pigginb291f002008-10-18 20:26:44 -0700304 SetPageMlocked(newpage);
Mel Gormanb32967f2012-11-19 12:35:47 +0000305 __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700306 }
Nick Pigginb291f002008-10-18 20:26:44 -0700307}
308
Mel Gormanb32967f2012-11-19 12:35:47 +0000309extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
310
Kirill A. Shutemove9b61f12016-01-15 16:54:10 -0800311/*
312 * At what user virtual address is page expected in @vma?
313 */
314static inline unsigned long
315__vma_address(struct page *page, struct vm_area_struct *vma)
316{
317 pgoff_t pgoff = page_to_pgoff(page);
318 return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
319}
320
321static inline unsigned long
322vma_address(struct page *page, struct vm_area_struct *vma)
323{
324 unsigned long address = __vma_address(page, vma);
325
326 /* page should be within @vma mapping range */
327 VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma);
328
329 return address;
330}
331
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800332#else /* !CONFIG_MMU */
Nick Pigginb291f002008-10-18 20:26:44 -0700333static inline void clear_page_mlock(struct page *page) { }
334static inline void mlock_vma_page(struct page *page) { }
335static inline void mlock_migrate_page(struct page *new, struct page *old) { }
336
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800337#endif /* !CONFIG_MMU */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700338
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800339/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800340 * Return the mem_map entry representing the 'offset' subpage within
341 * the maximally aligned gigantic page 'base'. Handle any discontiguity
342 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
343 */
344static inline struct page *mem_map_offset(struct page *base, int offset)
345{
346 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
Fabian Frederickbc7f84c2014-08-06 16:05:17 -0700347 return nth_page(base, offset);
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800348 return base + offset;
349}
350
351/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300352 * Iterator over all subpages within the maximally aligned gigantic
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800353 * page 'base'. Handle any discontiguity in the mem_map.
354 */
355static inline struct page *mem_map_next(struct page *iter,
356 struct page *base, int offset)
357{
358 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
359 unsigned long pfn = page_to_pfn(base) + offset;
360 if (!pfn_valid(pfn))
361 return NULL;
362 return pfn_to_page(pfn);
363 }
364 return iter + 1;
365}
366
367/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800368 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
369 * so all functions starting at paging_init should be marked __init
370 * in those cases. SPARSEMEM, however, allows for memory hotplug,
371 * and alloc_bootmem_node is not used.
372 */
373#ifdef CONFIG_SPARSEMEM
374#define __paginginit __meminit
375#else
376#define __paginginit __init
377#endif
378
Mel Gorman6b74ab92008-07-23 21:26:49 -0700379/* Memory initialisation debug and verification */
380enum mminit_level {
381 MMINIT_WARNING,
382 MMINIT_VERIFY,
383 MMINIT_TRACE
384};
385
386#ifdef CONFIG_DEBUG_MEMORY_INIT
387
388extern int mminit_loglevel;
389
390#define mminit_dprintk(level, prefix, fmt, arg...) \
391do { \
392 if (level < mminit_loglevel) { \
Rasmus Villemoesfc5199d2015-02-12 15:00:02 -0800393 if (level <= MMINIT_WARNING) \
Joe Perches11705322016-03-17 14:19:50 -0700394 pr_warn("mminit::" prefix " " fmt, ##arg); \
Rasmus Villemoesfc5199d2015-02-12 15:00:02 -0800395 else \
396 printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
Mel Gorman6b74ab92008-07-23 21:26:49 -0700397 } \
398} while (0)
399
Mel Gorman708614e2008-07-23 21:26:51 -0700400extern void mminit_verify_pageflags_layout(void);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700401extern void mminit_verify_zonelist(void);
Mel Gorman6b74ab92008-07-23 21:26:49 -0700402#else
403
404static inline void mminit_dprintk(enum mminit_level level,
405 const char *prefix, const char *fmt, ...)
406{
407}
408
Mel Gorman708614e2008-07-23 21:26:51 -0700409static inline void mminit_verify_pageflags_layout(void)
410{
411}
412
Mel Gorman68ad8df2008-07-23 21:26:52 -0700413static inline void mminit_verify_zonelist(void)
414{
415}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700416#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700417
418/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
419#if defined(CONFIG_SPARSEMEM)
420extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
421 unsigned long *end_pfn);
422#else
423static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
424 unsigned long *end_pfn)
425{
426}
427#endif /* CONFIG_SPARSEMEM */
428
Mel Gormanfa5e0842009-06-16 15:33:22 -0700429#define ZONE_RECLAIM_NOSCAN -2
430#define ZONE_RECLAIM_FULL -1
431#define ZONE_RECLAIM_SOME 0
432#define ZONE_RECLAIM_SUCCESS 1
Wu Fengguang7c116f22009-12-16 12:19:59 +0100433
Wu Fengguang31d3d342009-12-16 12:19:59 +0100434extern int hwpoison_filter(struct page *p);
435
Wu Fengguang7c116f22009-12-16 12:19:59 +0100436extern u32 hwpoison_filter_dev_major;
437extern u32 hwpoison_filter_dev_minor;
Wu Fengguang478c5ff2009-12-16 12:19:59 +0100438extern u64 hwpoison_filter_flags_mask;
439extern u64 hwpoison_filter_flags_value;
Andi Kleen4fd466e2009-12-16 12:19:59 +0100440extern u64 hwpoison_filter_memcg;
Haicheng Li1bfe5fe2009-12-16 12:19:59 +0100441extern u32 hwpoison_filter_enable;
Al Viroeb36c582012-05-30 20:17:35 -0400442
443extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,
444 unsigned long, unsigned long,
445 unsigned long, unsigned long);
Xishi Qiuca57df72012-07-31 16:43:19 -0700446
447extern void set_pageblock_order(void);
Minchan Kim02c6de82012-10-08 16:31:55 -0700448unsigned long reclaim_clean_pages_from_list(struct zone *zone,
449 struct list_head *page_list);
Bartlomiej Zolnierkiewiczd95ea5d2012-10-08 16:32:05 -0700450/* The ALLOC_WMARK bits are used as an index to zone->watermark */
451#define ALLOC_WMARK_MIN WMARK_MIN
452#define ALLOC_WMARK_LOW WMARK_LOW
453#define ALLOC_WMARK_HIGH WMARK_HIGH
454#define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
455
456/* Mask to get the watermark bits */
457#define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
458
459#define ALLOC_HARDER 0x10 /* try to alloc harder */
460#define ALLOC_HIGH 0x20 /* __GFP_HIGH set */
461#define ALLOC_CPUSET 0x40 /* check for correct cpuset */
462#define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
Johannes Weiner3a025762014-04-07 15:37:48 -0700463#define ALLOC_FAIR 0x100 /* fair zone allocation */
Bartlomiej Zolnierkiewiczd95ea5d2012-10-08 16:32:05 -0700464
Mel Gorman72b252a2015-09-04 15:47:32 -0700465enum ttu_flags;
466struct tlbflush_unmap_batch;
467
468#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
469void try_to_unmap_flush(void);
Mel Gormand950c942015-09-04 15:47:35 -0700470void try_to_unmap_flush_dirty(void);
Mel Gorman72b252a2015-09-04 15:47:32 -0700471#else
472static inline void try_to_unmap_flush(void)
473{
474}
Mel Gormand950c942015-09-04 15:47:35 -0700475static inline void try_to_unmap_flush_dirty(void)
476{
477}
Mel Gorman72b252a2015-09-04 15:47:32 -0700478
479#endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -0700480
481extern const struct trace_print_flags pageflag_names[];
482extern const struct trace_print_flags vmaflag_names[];
483extern const struct trace_print_flags gfpflag_names[];
484
Michel Lespinassedb971412012-10-08 16:29:34 -0700485#endif /* __MM_INTERNAL_H */