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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|\
Mel Gormane838a452016-06-24 14:49:37 -070027 __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC|\
28 __GFP_ATOMIC)
Mel Gormandd56b042015-11-06 16:28:43 -080029
30/* The GFP flags allowed during early boot */
31#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS))
32
33/* Control allocation cpuset and node placement constraints */
34#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
35
36/* Do not use these with a slab allocator */
37#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
38
Kirill A. Shutemovbae473a2016-07-26 15:25:20 -070039int do_swap_page(struct fault_env *fe, pte_t orig_pte);
Ebru Akagunduz8a966ed2016-07-26 15:25:03 -070040
Jan Beulich42b77722008-07-23 21:27:10 -070041void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
42 unsigned long floor, unsigned long ceiling);
43
Michal Hockoaac45362016-03-25 14:20:24 -070044void unmap_page_range(struct mmu_gather *tlb,
45 struct vm_area_struct *vma,
46 unsigned long addr, unsigned long end,
47 struct zap_details *details);
48
Fabian Frederick29f175d2014-04-07 15:37:55 -070049extern int __do_page_cache_readahead(struct address_space *mapping,
50 struct file *filp, pgoff_t offset, unsigned long nr_to_read,
51 unsigned long lookahead_size);
52
53/*
54 * Submit IO for the read-ahead request in file_ra_state.
55 */
56static inline unsigned long ra_submit(struct file_ra_state *ra,
57 struct address_space *mapping, struct file *filp)
58{
59 return __do_page_cache_readahead(mapping, filp,
60 ra->start, ra->size, ra->async_size);
61}
62
Nick Piggin7835e982006-03-22 00:08:40 -080063/*
Joonsoo Kim0139aa72016-05-19 17:10:49 -070064 * Turn a non-refcounted page (->_refcount == 0) into refcounted with
Nick Piggin7835e982006-03-22 00:08:40 -080065 * a count of one.
66 */
67static inline void set_page_refcounted(struct page *page)
68{
Sasha Levin309381fea2014-01-23 15:52:54 -080069 VM_BUG_ON_PAGE(PageTail(page), page);
Joonsoo Kimfe896d12016-03-17 14:19:26 -070070 VM_BUG_ON_PAGE(page_ref_count(page), page);
Nick Piggin77a8a782006-01-06 00:10:57 -080071 set_page_count(page, 1);
Nick Piggin77a8a782006-01-06 00:10:57 -080072}
73
Hugh Dickins03f64622009-09-21 17:03:35 -070074extern unsigned long highest_memmap_pfn;
75
Lee Schermerhorn894bc312008-10-18 20:26:39 -070076/*
77 * in mm/vmscan.c:
78 */
Nick Piggin62695a82008-10-18 20:26:09 -070079extern int isolate_lru_page(struct page *page);
Lee Schermerhorn894bc312008-10-18 20:26:39 -070080extern void putback_lru_page(struct page *page);
Lisa Du6e543d52013-09-11 14:22:36 -070081extern bool zone_reclaimable(struct zone *zone);
Nick Piggin62695a82008-10-18 20:26:09 -070082
Lee Schermerhorn894bc312008-10-18 20:26:39 -070083/*
Bob Liu62190492012-12-11 16:00:37 -080084 * in mm/rmap.c:
85 */
86extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
87
88/*
Lee Schermerhorn894bc312008-10-18 20:26:39 -070089 * in mm/page_alloc.c
90 */
Joonsoo Kim3c605092014-11-13 15:19:21 -080091
92/*
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -080093 * Structure for holding the mostly immutable allocation parameters passed
94 * between functions involved in allocations, including the alloc_pages*
95 * family of functions.
96 *
97 * nodemask, migratetype and high_zoneidx are initialized only once in
98 * __alloc_pages_nodemask() and then never change.
99 *
100 * zonelist, preferred_zone and classzone_idx are set first in
101 * __alloc_pages_nodemask() for the fast path, and might be later changed
102 * in __alloc_pages_slowpath(). All other functions pass the whole strucure
103 * by a const pointer.
104 */
105struct alloc_context {
106 struct zonelist *zonelist;
107 nodemask_t *nodemask;
Mel Gormanc33d6c02016-05-19 17:14:10 -0700108 struct zoneref *preferred_zoneref;
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -0800109 int migratetype;
110 enum zone_type high_zoneidx;
Mel Gormanc9ab0c42015-11-06 16:28:12 -0800111 bool spread_dirty_pages;
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -0800112};
113
Mel Gorman93ea9962016-05-19 17:14:13 -0700114#define ac_classzone_idx(ac) zonelist_zone_idx(ac->preferred_zoneref)
115
Vlastimil Babka1a6d53a2015-02-11 15:25:44 -0800116/*
Joonsoo Kim3c605092014-11-13 15:19:21 -0800117 * Locate the struct page for both the matching buddy in our
118 * pair (buddy1) and the combined O(n+1) page they form (page).
119 *
120 * 1) Any buddy B1 will have an order O twin B2 which satisfies
121 * the following equation:
122 * B2 = B1 ^ (1 << O)
123 * For example, if the starting buddy (buddy2) is #8 its order
124 * 1 buddy is #10:
125 * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10
126 *
127 * 2) Any buddy B will have an order O+1 parent P which
128 * satisfies the following equation:
129 * P = B & ~(1 << O)
130 *
131 * Assumption: *_mem_map is contiguous at least up to MAX_ORDER
132 */
133static inline unsigned long
134__find_buddy_index(unsigned long page_idx, unsigned int order)
135{
136 return page_idx ^ (1 << order);
137}
138
Joonsoo Kim7cf91a92016-03-15 14:57:51 -0700139extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
140 unsigned long end_pfn, struct zone *zone);
141
142static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn,
143 unsigned long end_pfn, struct zone *zone)
144{
145 if (zone->contiguous)
146 return pfn_to_page(start_pfn);
147
148 return __pageblock_pfn_to_page(start_pfn, end_pfn, zone);
149}
150
Joonsoo Kim3c605092014-11-13 15:19:21 -0800151extern int __isolate_free_page(struct page *page, unsigned int order);
Mel Gormand70ddd72015-06-30 14:56:52 -0700152extern void __free_pages_bootmem(struct page *page, unsigned long pfn,
153 unsigned int order);
Kirill A. Shutemovd00181b2015-11-06 16:29:57 -0800154extern void prep_compound_page(struct page *page, unsigned int order);
Joonsoo Kim46f24fd2016-07-26 15:23:58 -0700155extern void post_alloc_hook(struct page *page, unsigned int order,
156 gfp_t gfp_flags);
Han Pingtian42aa83c2014-01-23 15:53:28 -0800157extern int user_min_free_kbytes;
Wu Fengguang20a03072009-06-16 15:32:22 -0700158
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100159#if defined CONFIG_COMPACTION || defined CONFIG_CMA
160
161/*
162 * in mm/compaction.c
163 */
164/*
165 * compact_control is used to track pages being migrated and the free pages
166 * they are being migrated to during memory compaction. The free_pfn starts
167 * at the end of a zone and migrate_pfn begins at the start. Movable pages
168 * are moved to the end of a zone during a compaction run and the run
169 * completes when free_pfn <= migrate_pfn
170 */
171struct compact_control {
172 struct list_head freepages; /* List of free pages to migrate to */
173 struct list_head migratepages; /* List of pages being migrated */
174 unsigned long nr_freepages; /* Number of isolated free pages */
175 unsigned long nr_migratepages; /* Number of pages to migrate */
176 unsigned long free_pfn; /* isolate_freepages search base */
177 unsigned long migrate_pfn; /* isolate_migratepages search base */
Joonsoo Kim1a167182015-09-08 15:03:59 -0700178 unsigned long last_migrated_pfn;/* Not yet flushed page being freed */
David Rientjese0b9dae2014-06-04 16:08:28 -0700179 enum migrate_mode mode; /* Async or sync migration mode */
Mel Gormanbb13ffe2012-10-08 16:32:41 -0700180 bool ignore_skip_hint; /* Scan blocks even if marked skip */
Vlastimil Babkaaccf6242016-03-17 14:18:15 -0700181 bool direct_compaction; /* False from kcompactd or /proc/... */
Michal Hockoc8f7de02016-05-20 16:56:47 -0700182 bool whole_zone; /* Whole zone has been scanned */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100183 int order; /* order a direct compactor needs */
David Rientjes6d7ce552014-10-09 15:27:27 -0700184 const gfp_t gfp_mask; /* gfp mask of a direct compactor */
Mel Gormanc6038442016-05-19 17:13:38 -0700185 const unsigned int alloc_flags; /* alloc flags of a direct compactor */
Vlastimil Babkaebff3982014-12-10 15:43:22 -0800186 const int classzone_idx; /* zone index of a direct compactor */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100187 struct zone *zone;
Vlastimil Babka1f9efde2014-10-09 15:27:14 -0700188 int contended; /* Signal need_sched() or lock
189 * contention detected during
Vlastimil Babkabe976572014-06-04 16:10:41 -0700190 * compaction
191 */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100192};
193
194unsigned long
Mel Gormanbb13ffe2012-10-08 16:32:41 -0700195isolate_freepages_range(struct compact_control *cc,
196 unsigned long start_pfn, unsigned long end_pfn);
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100197unsigned long
Vlastimil Babkaedc2ca62014-10-09 15:27:09 -0700198isolate_migratepages_range(struct compact_control *cc,
199 unsigned long low_pfn, unsigned long end_pfn);
Joonsoo Kim2149cda2015-04-14 15:45:21 -0700200int find_suitable_fallback(struct free_area *area, unsigned int order,
201 int migratetype, bool only_stealable, bool *can_steal);
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100202
203#endif
Nick Piggin0f8053a2006-03-22 00:08:33 -0800204
Mel Gorman48f13bf2007-10-16 01:26:10 -0700205/*
Mel Gorman6c144662014-01-23 15:53:38 -0800206 * This function returns the order of a free page in the buddy system. In
207 * general, page_zone(page)->lock must be held by the caller to prevent the
208 * page from being allocated in parallel and returning garbage as the order.
209 * If a caller does not hold page_zone(page)->lock, it must guarantee that the
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700210 * page cannot be allocated or merged in parallel. Alternatively, it must
211 * handle invalid values gracefully, and use page_order_unsafe() below.
Mel Gorman48f13bf2007-10-16 01:26:10 -0700212 */
Kirill A. Shutemovd00181b2015-11-06 16:29:57 -0800213static inline unsigned int page_order(struct page *page)
Mel Gorman48f13bf2007-10-16 01:26:10 -0700214{
KAMEZAWA Hiroyuki572438f2010-10-26 14:22:08 -0700215 /* PageBuddy() must be checked by the caller */
Mel Gorman48f13bf2007-10-16 01:26:10 -0700216 return page_private(page);
217}
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800218
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700219/*
220 * Like page_order(), but for callers who cannot afford to hold the zone lock.
221 * PageBuddy() should be checked first by the caller to minimize race window,
222 * and invalid values must be handled gracefully.
223 *
Jason Low4db0c3c2015-04-15 16:14:08 -0700224 * READ_ONCE is used so that if the caller assigns the result into a local
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700225 * variable and e.g. tests it for valid range before using, the compiler cannot
226 * decide to remove the variable and inline the page_private(page) multiple
227 * times, potentially observing different values in the tests and the actual
228 * use of the result.
229 */
Jason Low4db0c3c2015-04-15 16:14:08 -0700230#define page_order_unsafe(page) READ_ONCE(page_private(page))
Vlastimil Babka99c0fd52014-10-09 15:27:23 -0700231
Kirill A. Shutemov4bbd4c72014-06-04 16:08:10 -0700232static inline bool is_cow_mapping(vm_flags_t flags)
233{
234 return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
235}
236
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800237/*
238 * These three helpers classifies VMAs for virtual memory accounting.
239 */
240
241/*
242 * Executable code area - executable, not writable, not stack
243 */
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800244static inline bool is_exec_mapping(vm_flags_t flags)
245{
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800246 return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC;
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800247}
248
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800249/*
250 * Stack area - atomatically grows in one direction
251 *
252 * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
253 * do_mmap() forbids all other combinations.
254 */
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800255static inline bool is_stack_mapping(vm_flags_t flags)
256{
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800257 return (flags & VM_STACK) == VM_STACK;
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800258}
259
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800260/*
261 * Data area - private, writable, not stack
262 */
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800263static inline bool is_data_mapping(vm_flags_t flags)
264{
Konstantin Khlebnikov30bdbb72016-02-02 16:57:46 -0800265 return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE;
Konstantin Khlebnikovd977d562016-02-02 16:57:43 -0800266}
267
Namhyung Kim6038def2011-05-24 17:11:22 -0700268/* mm/util.c */
269void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
270 struct vm_area_struct *prev, struct rb_node *rb_parent);
271
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800272#ifdef CONFIG_MMU
Kirill A. Shutemovfc05f562015-04-14 15:44:39 -0700273extern long populate_vma_page_range(struct vm_area_struct *vma,
Michel Lespinassecea10a12013-02-22 16:32:44 -0800274 unsigned long start, unsigned long end, int *nonblocking);
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800275extern void munlock_vma_pages_range(struct vm_area_struct *vma,
276 unsigned long start, unsigned long end);
277static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
278{
279 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
280}
281
Nick Pigginb291f002008-10-18 20:26:44 -0700282/*
Hugh Dickins73848b42009-12-14 17:59:22 -0800283 * must be called with vma's mmap_sem held for read or write, and page locked.
Nick Pigginb291f002008-10-18 20:26:44 -0700284 */
285extern void mlock_vma_page(struct page *page);
Michel Lespinasseff6a6da2013-02-27 17:02:44 -0800286extern unsigned int munlock_vma_page(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700287
288/*
289 * Clear the page's PageMlocked(). This can be useful in a situation where
290 * we want to unconditionally remove a page from the pagecache -- e.g.,
291 * on truncation or freeing.
292 *
293 * It is legal to call this function for any page, mlocked or not.
294 * If called for a page that is still mapped by mlocked vmas, all we do
295 * is revert to lazy LRU behaviour -- semantics are not broken.
296 */
Hugh Dickinse6c509f2012-10-08 16:33:19 -0700297extern void clear_page_mlock(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700298
299/*
Hugh Dickins51afb122015-11-05 18:49:37 -0800300 * mlock_migrate_page - called only from migrate_misplaced_transhuge_page()
301 * (because that does not go through the full procedure of migration ptes):
302 * to migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700303 */
304static inline void mlock_migrate_page(struct page *newpage, struct page *page)
305{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700306 if (TestClearPageMlocked(page)) {
Mel Gormanb32967f2012-11-19 12:35:47 +0000307 int nr_pages = hpage_nr_pages(page);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700308
Hugh Dickins51afb122015-11-05 18:49:37 -0800309 /* Holding pmd lock, no change in irq context: __mod is safe */
Mel Gormanb32967f2012-11-19 12:35:47 +0000310 __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
Nick Pigginb291f002008-10-18 20:26:44 -0700311 SetPageMlocked(newpage);
Mel Gormanb32967f2012-11-19 12:35:47 +0000312 __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700313 }
Nick Pigginb291f002008-10-18 20:26:44 -0700314}
315
Mel Gormanb32967f2012-11-19 12:35:47 +0000316extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
317
Kirill A. Shutemove9b61f12016-01-15 16:54:10 -0800318/*
319 * At what user virtual address is page expected in @vma?
320 */
321static inline unsigned long
322__vma_address(struct page *page, struct vm_area_struct *vma)
323{
324 pgoff_t pgoff = page_to_pgoff(page);
325 return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
326}
327
328static inline unsigned long
329vma_address(struct page *page, struct vm_area_struct *vma)
330{
331 unsigned long address = __vma_address(page, vma);
332
333 /* page should be within @vma mapping range */
334 VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma);
335
336 return address;
337}
338
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800339#else /* !CONFIG_MMU */
Nick Pigginb291f002008-10-18 20:26:44 -0700340static inline void clear_page_mlock(struct page *page) { }
341static inline void mlock_vma_page(struct page *page) { }
342static inline void mlock_migrate_page(struct page *new, struct page *old) { }
343
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800344#endif /* !CONFIG_MMU */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700345
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800346/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800347 * Return the mem_map entry representing the 'offset' subpage within
348 * the maximally aligned gigantic page 'base'. Handle any discontiguity
349 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
350 */
351static inline struct page *mem_map_offset(struct page *base, int offset)
352{
353 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
Fabian Frederickbc7f84c2014-08-06 16:05:17 -0700354 return nth_page(base, offset);
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800355 return base + offset;
356}
357
358/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300359 * Iterator over all subpages within the maximally aligned gigantic
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800360 * page 'base'. Handle any discontiguity in the mem_map.
361 */
362static inline struct page *mem_map_next(struct page *iter,
363 struct page *base, int offset)
364{
365 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
366 unsigned long pfn = page_to_pfn(base) + offset;
367 if (!pfn_valid(pfn))
368 return NULL;
369 return pfn_to_page(pfn);
370 }
371 return iter + 1;
372}
373
374/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800375 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
376 * so all functions starting at paging_init should be marked __init
377 * in those cases. SPARSEMEM, however, allows for memory hotplug,
378 * and alloc_bootmem_node is not used.
379 */
380#ifdef CONFIG_SPARSEMEM
381#define __paginginit __meminit
382#else
383#define __paginginit __init
384#endif
385
Mel Gorman6b74ab92008-07-23 21:26:49 -0700386/* Memory initialisation debug and verification */
387enum mminit_level {
388 MMINIT_WARNING,
389 MMINIT_VERIFY,
390 MMINIT_TRACE
391};
392
393#ifdef CONFIG_DEBUG_MEMORY_INIT
394
395extern int mminit_loglevel;
396
397#define mminit_dprintk(level, prefix, fmt, arg...) \
398do { \
399 if (level < mminit_loglevel) { \
Rasmus Villemoesfc5199d2015-02-12 15:00:02 -0800400 if (level <= MMINIT_WARNING) \
Joe Perches11705322016-03-17 14:19:50 -0700401 pr_warn("mminit::" prefix " " fmt, ##arg); \
Rasmus Villemoesfc5199d2015-02-12 15:00:02 -0800402 else \
403 printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
Mel Gorman6b74ab92008-07-23 21:26:49 -0700404 } \
405} while (0)
406
Mel Gorman708614e2008-07-23 21:26:51 -0700407extern void mminit_verify_pageflags_layout(void);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700408extern void mminit_verify_zonelist(void);
Mel Gorman6b74ab92008-07-23 21:26:49 -0700409#else
410
411static inline void mminit_dprintk(enum mminit_level level,
412 const char *prefix, const char *fmt, ...)
413{
414}
415
Mel Gorman708614e2008-07-23 21:26:51 -0700416static inline void mminit_verify_pageflags_layout(void)
417{
418}
419
Mel Gorman68ad8df2008-07-23 21:26:52 -0700420static inline void mminit_verify_zonelist(void)
421{
422}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700423#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700424
425/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
426#if defined(CONFIG_SPARSEMEM)
427extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
428 unsigned long *end_pfn);
429#else
430static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
431 unsigned long *end_pfn)
432{
433}
434#endif /* CONFIG_SPARSEMEM */
435
Mel Gormanfa5e0842009-06-16 15:33:22 -0700436#define ZONE_RECLAIM_NOSCAN -2
437#define ZONE_RECLAIM_FULL -1
438#define ZONE_RECLAIM_SOME 0
439#define ZONE_RECLAIM_SUCCESS 1
Wu Fengguang7c116f22009-12-16 12:19:59 +0100440
Wu Fengguang31d3d342009-12-16 12:19:59 +0100441extern int hwpoison_filter(struct page *p);
442
Wu Fengguang7c116f22009-12-16 12:19:59 +0100443extern u32 hwpoison_filter_dev_major;
444extern u32 hwpoison_filter_dev_minor;
Wu Fengguang478c5ff2009-12-16 12:19:59 +0100445extern u64 hwpoison_filter_flags_mask;
446extern u64 hwpoison_filter_flags_value;
Andi Kleen4fd466e2009-12-16 12:19:59 +0100447extern u64 hwpoison_filter_memcg;
Haicheng Li1bfe5fe2009-12-16 12:19:59 +0100448extern u32 hwpoison_filter_enable;
Al Viroeb36c582012-05-30 20:17:35 -0400449
Michal Hockodc0ef0d2016-05-23 16:25:27 -0700450extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long,
Al Viroeb36c582012-05-30 20:17:35 -0400451 unsigned long, unsigned long,
Michal Hocko9fbeb5a2016-05-23 16:25:30 -0700452 unsigned long, unsigned long);
Xishi Qiuca57df72012-07-31 16:43:19 -0700453
454extern void set_pageblock_order(void);
Minchan Kim02c6de82012-10-08 16:31:55 -0700455unsigned long reclaim_clean_pages_from_list(struct zone *zone,
456 struct list_head *page_list);
Bartlomiej Zolnierkiewiczd95ea5d2012-10-08 16:32:05 -0700457/* The ALLOC_WMARK bits are used as an index to zone->watermark */
458#define ALLOC_WMARK_MIN WMARK_MIN
459#define ALLOC_WMARK_LOW WMARK_LOW
460#define ALLOC_WMARK_HIGH WMARK_HIGH
461#define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
462
463/* Mask to get the watermark bits */
464#define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
465
466#define ALLOC_HARDER 0x10 /* try to alloc harder */
467#define ALLOC_HIGH 0x20 /* __GFP_HIGH set */
468#define ALLOC_CPUSET 0x40 /* check for correct cpuset */
469#define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
Johannes Weiner3a025762014-04-07 15:37:48 -0700470#define ALLOC_FAIR 0x100 /* fair zone allocation */
Bartlomiej Zolnierkiewiczd95ea5d2012-10-08 16:32:05 -0700471
Mel Gorman72b252a2015-09-04 15:47:32 -0700472enum ttu_flags;
473struct tlbflush_unmap_batch;
474
475#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
476void try_to_unmap_flush(void);
Mel Gormand950c942015-09-04 15:47:35 -0700477void try_to_unmap_flush_dirty(void);
Mel Gorman72b252a2015-09-04 15:47:32 -0700478#else
479static inline void try_to_unmap_flush(void)
480{
481}
Mel Gormand950c942015-09-04 15:47:35 -0700482static inline void try_to_unmap_flush_dirty(void)
483{
484}
Mel Gorman72b252a2015-09-04 15:47:32 -0700485
486#endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -0700487
488extern const struct trace_print_flags pageflag_names[];
489extern const struct trace_print_flags vmaflag_names[];
490extern const struct trace_print_flags gfpflag_names[];
491
Michel Lespinassedb971412012-10-08 16:29:34 -0700492#endif /* __MM_INTERNAL_H */