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1da177e4 LT |
1 | /* 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 | */ | |
0f8053a5 NP |
11 | #ifndef __MM_INTERNAL_H |
12 | #define __MM_INTERNAL_H | |
13 | ||
14 | #include <linux/mm.h> | |
1da177e4 | 15 | |
42b77728 JB |
16 | void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
17 | unsigned long floor, unsigned long ceiling); | |
18 | ||
7835e98b | 19 | static inline void set_page_count(struct page *page, int v) |
77a8a788 | 20 | { |
7835e98b NP |
21 | atomic_set(&page->_count, v); |
22 | } | |
23 | ||
24 | /* | |
25 | * Turn a non-refcounted page (->_count == 0) into refcounted with | |
26 | * a count of one. | |
27 | */ | |
28 | static inline void set_page_refcounted(struct page *page) | |
29 | { | |
309381fe SL |
30 | VM_BUG_ON_PAGE(PageTail(page), page); |
31 | VM_BUG_ON_PAGE(atomic_read(&page->_count), page); | |
77a8a788 | 32 | set_page_count(page, 1); |
77a8a788 NP |
33 | } |
34 | ||
70b50f94 AA |
35 | static inline void __get_page_tail_foll(struct page *page, |
36 | bool get_page_head) | |
37 | { | |
38 | /* | |
39 | * If we're getting a tail page, the elevated page->_count is | |
40 | * required only in the head page and we will elevate the head | |
41 | * page->_count and tail page->_mapcount. | |
42 | * | |
43 | * We elevate page_tail->_mapcount for tail pages to force | |
44 | * page_tail->_count to be zero at all times to avoid getting | |
45 | * false positives from get_page_unless_zero() with | |
46 | * speculative page access (like in | |
47 | * page_cache_get_speculative()) on tail pages. | |
48 | */ | |
309381fe | 49 | VM_BUG_ON_PAGE(atomic_read(&page->first_page->_count) <= 0, page); |
70b50f94 AA |
50 | if (get_page_head) |
51 | atomic_inc(&page->first_page->_count); | |
c728852f | 52 | get_huge_page_tail(page); |
70b50f94 AA |
53 | } |
54 | ||
55 | /* | |
56 | * This is meant to be called as the FOLL_GET operation of | |
57 | * follow_page() and it must be called while holding the proper PT | |
58 | * lock while the pte (or pmd_trans_huge) is still mapping the page. | |
59 | */ | |
60 | static inline void get_page_foll(struct page *page) | |
61 | { | |
62 | if (unlikely(PageTail(page))) | |
63 | /* | |
64 | * This is safe only because | |
65 | * __split_huge_page_refcount() can't run under | |
66 | * get_page_foll() because we hold the proper PT lock. | |
67 | */ | |
68 | __get_page_tail_foll(page, true); | |
69 | else { | |
70 | /* | |
71 | * Getting a normal page or the head of a compound page | |
72 | * requires to already have an elevated page->_count. | |
73 | */ | |
309381fe | 74 | VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page); |
70b50f94 AA |
75 | atomic_inc(&page->_count); |
76 | } | |
77 | } | |
78 | ||
03f6462a HD |
79 | extern unsigned long highest_memmap_pfn; |
80 | ||
894bc310 LS |
81 | /* |
82 | * in mm/vmscan.c: | |
83 | */ | |
62695a84 | 84 | extern int isolate_lru_page(struct page *page); |
894bc310 | 85 | extern void putback_lru_page(struct page *page); |
6e543d57 | 86 | extern bool zone_reclaimable(struct zone *zone); |
62695a84 | 87 | |
6219049a BL |
88 | /* |
89 | * in mm/rmap.c: | |
90 | */ | |
91 | extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); | |
92 | ||
894bc310 LS |
93 | /* |
94 | * in mm/page_alloc.c | |
95 | */ | |
0c0a4a51 | 96 | extern void __free_pages_bootmem(struct page *page, unsigned int order); |
20a0307c | 97 | extern void prep_compound_page(struct page *page, unsigned long order); |
8d22ba1b WF |
98 | #ifdef CONFIG_MEMORY_FAILURE |
99 | extern bool is_free_buddy_page(struct page *page); | |
100 | #endif | |
42aa83cb | 101 | extern int user_min_free_kbytes; |
20a0307c | 102 | |
ff9543fd MN |
103 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA |
104 | ||
105 | /* | |
106 | * in mm/compaction.c | |
107 | */ | |
108 | /* | |
109 | * compact_control is used to track pages being migrated and the free pages | |
110 | * they are being migrated to during memory compaction. The free_pfn starts | |
111 | * at the end of a zone and migrate_pfn begins at the start. Movable pages | |
112 | * are moved to the end of a zone during a compaction run and the run | |
113 | * completes when free_pfn <= migrate_pfn | |
114 | */ | |
115 | struct compact_control { | |
116 | struct list_head freepages; /* List of free pages to migrate to */ | |
117 | struct list_head migratepages; /* List of pages being migrated */ | |
118 | unsigned long nr_freepages; /* Number of isolated free pages */ | |
119 | unsigned long nr_migratepages; /* Number of pages to migrate */ | |
120 | unsigned long free_pfn; /* isolate_freepages search base */ | |
121 | unsigned long migrate_pfn; /* isolate_migratepages search base */ | |
68e3e926 | 122 | bool sync; /* Synchronous migration */ |
bb13ffeb | 123 | bool ignore_skip_hint; /* Scan blocks even if marked skip */ |
c89511ab MG |
124 | bool finished_update_free; /* True when the zone cached pfns are |
125 | * no longer being updated | |
126 | */ | |
127 | bool finished_update_migrate; | |
ff9543fd MN |
128 | |
129 | int order; /* order a direct compactor needs */ | |
130 | int migratetype; /* MOVABLE, RECLAIMABLE etc */ | |
131 | struct zone *zone; | |
e64c5237 | 132 | bool contended; /* True if a lock was contended */ |
ff9543fd MN |
133 | }; |
134 | ||
135 | unsigned long | |
bb13ffeb MG |
136 | isolate_freepages_range(struct compact_control *cc, |
137 | unsigned long start_pfn, unsigned long end_pfn); | |
ff9543fd MN |
138 | unsigned long |
139 | isolate_migratepages_range(struct zone *zone, struct compact_control *cc, | |
e46a2879 | 140 | unsigned long low_pfn, unsigned long end_pfn, bool unevictable); |
ff9543fd MN |
141 | |
142 | #endif | |
0f8053a5 | 143 | |
48f13bf3 | 144 | /* |
6c14466c MG |
145 | * This function returns the order of a free page in the buddy system. In |
146 | * general, page_zone(page)->lock must be held by the caller to prevent the | |
147 | * page from being allocated in parallel and returning garbage as the order. | |
148 | * If a caller does not hold page_zone(page)->lock, it must guarantee that the | |
149 | * page cannot be allocated or merged in parallel. | |
48f13bf3 MG |
150 | */ |
151 | static inline unsigned long page_order(struct page *page) | |
152 | { | |
572438f9 | 153 | /* PageBuddy() must be checked by the caller */ |
48f13bf3 MG |
154 | return page_private(page); |
155 | } | |
b5a0e011 | 156 | |
6038def0 NK |
157 | /* mm/util.c */ |
158 | void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, | |
159 | struct vm_area_struct *prev, struct rb_node *rb_parent); | |
160 | ||
af8e3354 | 161 | #ifdef CONFIG_MMU |
cea10a19 ML |
162 | extern long __mlock_vma_pages_range(struct vm_area_struct *vma, |
163 | unsigned long start, unsigned long end, int *nonblocking); | |
af8e3354 HD |
164 | extern void munlock_vma_pages_range(struct vm_area_struct *vma, |
165 | unsigned long start, unsigned long end); | |
166 | static inline void munlock_vma_pages_all(struct vm_area_struct *vma) | |
167 | { | |
168 | munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); | |
169 | } | |
170 | ||
b291f000 | 171 | /* |
39b5f29a HD |
172 | * Called only in fault path, to determine if a new page is being |
173 | * mapped into a LOCKED vma. If it is, mark page as mlocked. | |
b291f000 | 174 | */ |
096a7cf4 YH |
175 | static inline int mlocked_vma_newpage(struct vm_area_struct *vma, |
176 | struct page *page) | |
b291f000 | 177 | { |
309381fe | 178 | VM_BUG_ON_PAGE(PageLRU(page), page); |
b291f000 NP |
179 | |
180 | if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) | |
181 | return 0; | |
182 | ||
5344b7e6 | 183 | if (!TestSetPageMlocked(page)) { |
8449d21f DR |
184 | mod_zone_page_state(page_zone(page), NR_MLOCK, |
185 | hpage_nr_pages(page)); | |
5344b7e6 NP |
186 | count_vm_event(UNEVICTABLE_PGMLOCKED); |
187 | } | |
b291f000 NP |
188 | return 1; |
189 | } | |
190 | ||
191 | /* | |
73848b46 | 192 | * must be called with vma's mmap_sem held for read or write, and page locked. |
b291f000 NP |
193 | */ |
194 | extern void mlock_vma_page(struct page *page); | |
ff6a6da6 | 195 | extern unsigned int munlock_vma_page(struct page *page); |
b291f000 NP |
196 | |
197 | /* | |
198 | * Clear the page's PageMlocked(). This can be useful in a situation where | |
199 | * we want to unconditionally remove a page from the pagecache -- e.g., | |
200 | * on truncation or freeing. | |
201 | * | |
202 | * It is legal to call this function for any page, mlocked or not. | |
203 | * If called for a page that is still mapped by mlocked vmas, all we do | |
204 | * is revert to lazy LRU behaviour -- semantics are not broken. | |
205 | */ | |
e6c509f8 | 206 | extern void clear_page_mlock(struct page *page); |
b291f000 NP |
207 | |
208 | /* | |
209 | * mlock_migrate_page - called only from migrate_page_copy() to | |
5344b7e6 | 210 | * migrate the Mlocked page flag; update statistics. |
b291f000 NP |
211 | */ |
212 | static inline void mlock_migrate_page(struct page *newpage, struct page *page) | |
213 | { | |
5344b7e6 NP |
214 | if (TestClearPageMlocked(page)) { |
215 | unsigned long flags; | |
b32967ff | 216 | int nr_pages = hpage_nr_pages(page); |
5344b7e6 NP |
217 | |
218 | local_irq_save(flags); | |
b32967ff | 219 | __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages); |
b291f000 | 220 | SetPageMlocked(newpage); |
b32967ff | 221 | __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages); |
5344b7e6 NP |
222 | local_irq_restore(flags); |
223 | } | |
b291f000 NP |
224 | } |
225 | ||
b32967ff MG |
226 | extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); |
227 | ||
71e3aac0 AA |
228 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
229 | extern unsigned long vma_address(struct page *page, | |
230 | struct vm_area_struct *vma); | |
231 | #endif | |
af8e3354 | 232 | #else /* !CONFIG_MMU */ |
096a7cf4 | 233 | static inline int mlocked_vma_newpage(struct vm_area_struct *v, struct page *p) |
b291f000 NP |
234 | { |
235 | return 0; | |
236 | } | |
237 | static inline void clear_page_mlock(struct page *page) { } | |
238 | static inline void mlock_vma_page(struct page *page) { } | |
239 | static inline void mlock_migrate_page(struct page *new, struct page *old) { } | |
240 | ||
af8e3354 | 241 | #endif /* !CONFIG_MMU */ |
894bc310 | 242 | |
69d177c2 AW |
243 | /* |
244 | * Return the mem_map entry representing the 'offset' subpage within | |
245 | * the maximally aligned gigantic page 'base'. Handle any discontiguity | |
246 | * in the mem_map at MAX_ORDER_NR_PAGES boundaries. | |
247 | */ | |
248 | static inline struct page *mem_map_offset(struct page *base, int offset) | |
249 | { | |
250 | if (unlikely(offset >= MAX_ORDER_NR_PAGES)) | |
251 | return pfn_to_page(page_to_pfn(base) + offset); | |
252 | return base + offset; | |
253 | } | |
254 | ||
255 | /* | |
25985edc | 256 | * Iterator over all subpages within the maximally aligned gigantic |
69d177c2 AW |
257 | * page 'base'. Handle any discontiguity in the mem_map. |
258 | */ | |
259 | static inline struct page *mem_map_next(struct page *iter, | |
260 | struct page *base, int offset) | |
261 | { | |
262 | if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { | |
263 | unsigned long pfn = page_to_pfn(base) + offset; | |
264 | if (!pfn_valid(pfn)) | |
265 | return NULL; | |
266 | return pfn_to_page(pfn); | |
267 | } | |
268 | return iter + 1; | |
269 | } | |
270 | ||
b5a0e011 AH |
271 | /* |
272 | * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, | |
273 | * so all functions starting at paging_init should be marked __init | |
274 | * in those cases. SPARSEMEM, however, allows for memory hotplug, | |
275 | * and alloc_bootmem_node is not used. | |
276 | */ | |
277 | #ifdef CONFIG_SPARSEMEM | |
278 | #define __paginginit __meminit | |
279 | #else | |
280 | #define __paginginit __init | |
281 | #endif | |
282 | ||
6b74ab97 MG |
283 | /* Memory initialisation debug and verification */ |
284 | enum mminit_level { | |
285 | MMINIT_WARNING, | |
286 | MMINIT_VERIFY, | |
287 | MMINIT_TRACE | |
288 | }; | |
289 | ||
290 | #ifdef CONFIG_DEBUG_MEMORY_INIT | |
291 | ||
292 | extern int mminit_loglevel; | |
293 | ||
294 | #define mminit_dprintk(level, prefix, fmt, arg...) \ | |
295 | do { \ | |
296 | if (level < mminit_loglevel) { \ | |
297 | printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ | |
298 | printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ | |
299 | } \ | |
300 | } while (0) | |
301 | ||
708614e6 MG |
302 | extern void mminit_verify_pageflags_layout(void); |
303 | extern void mminit_verify_page_links(struct page *page, | |
304 | enum zone_type zone, unsigned long nid, unsigned long pfn); | |
68ad8df4 | 305 | extern void mminit_verify_zonelist(void); |
708614e6 | 306 | |
6b74ab97 MG |
307 | #else |
308 | ||
309 | static inline void mminit_dprintk(enum mminit_level level, | |
310 | const char *prefix, const char *fmt, ...) | |
311 | { | |
312 | } | |
313 | ||
708614e6 MG |
314 | static inline void mminit_verify_pageflags_layout(void) |
315 | { | |
316 | } | |
317 | ||
318 | static inline void mminit_verify_page_links(struct page *page, | |
319 | enum zone_type zone, unsigned long nid, unsigned long pfn) | |
320 | { | |
321 | } | |
68ad8df4 MG |
322 | |
323 | static inline void mminit_verify_zonelist(void) | |
324 | { | |
325 | } | |
6b74ab97 | 326 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
2dbb51c4 MG |
327 | |
328 | /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ | |
329 | #if defined(CONFIG_SPARSEMEM) | |
330 | extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
331 | unsigned long *end_pfn); | |
332 | #else | |
333 | static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
334 | unsigned long *end_pfn) | |
335 | { | |
336 | } | |
337 | #endif /* CONFIG_SPARSEMEM */ | |
338 | ||
fa5e084e MG |
339 | #define ZONE_RECLAIM_NOSCAN -2 |
340 | #define ZONE_RECLAIM_FULL -1 | |
341 | #define ZONE_RECLAIM_SOME 0 | |
342 | #define ZONE_RECLAIM_SUCCESS 1 | |
7c116f2b | 343 | |
31d3d348 WF |
344 | extern int hwpoison_filter(struct page *p); |
345 | ||
7c116f2b WF |
346 | extern u32 hwpoison_filter_dev_major; |
347 | extern u32 hwpoison_filter_dev_minor; | |
478c5ffc WF |
348 | extern u64 hwpoison_filter_flags_mask; |
349 | extern u64 hwpoison_filter_flags_value; | |
4fd466eb | 350 | extern u64 hwpoison_filter_memcg; |
1bfe5feb | 351 | extern u32 hwpoison_filter_enable; |
eb36c587 AV |
352 | |
353 | extern unsigned long vm_mmap_pgoff(struct file *, unsigned long, | |
354 | unsigned long, unsigned long, | |
355 | unsigned long, unsigned long); | |
ca57df79 XQ |
356 | |
357 | extern void set_pageblock_order(void); | |
02c6de8d MK |
358 | unsigned long reclaim_clean_pages_from_list(struct zone *zone, |
359 | struct list_head *page_list); | |
d95ea5d1 BZ |
360 | /* The ALLOC_WMARK bits are used as an index to zone->watermark */ |
361 | #define ALLOC_WMARK_MIN WMARK_MIN | |
362 | #define ALLOC_WMARK_LOW WMARK_LOW | |
363 | #define ALLOC_WMARK_HIGH WMARK_HIGH | |
364 | #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */ | |
365 | ||
366 | /* Mask to get the watermark bits */ | |
367 | #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1) | |
368 | ||
369 | #define ALLOC_HARDER 0x10 /* try to alloc harder */ | |
370 | #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ | |
371 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ | |
372 | #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */ | |
373 | ||
db971418 | 374 | #endif /* __MM_INTERNAL_H */ |