]>
Commit | Line | Data |
---|---|---|
2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* internal.h: mm/ internal definitions |
3 | * | |
4 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
1da177e4 | 6 | */ |
0f8053a5 NP |
7 | #ifndef __MM_INTERNAL_H |
8 | #define __MM_INTERNAL_H | |
9 | ||
29f175d1 | 10 | #include <linux/fs.h> |
0f8053a5 | 11 | #include <linux/mm.h> |
e9b61f19 | 12 | #include <linux/pagemap.h> |
edf14cdb | 13 | #include <linux/tracepoint-defs.h> |
1da177e4 | 14 | |
dd56b046 MG |
15 | /* |
16 | * The set of flags that only affect watermark checking and reclaim | |
17 | * behaviour. This is used by the MM to obey the caller constraints | |
18 | * about IO, FS and watermark checking while ignoring placement | |
19 | * hints such as HIGHMEM usage. | |
20 | */ | |
21 | #define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
dcda9b04 | 22 | __GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NOFAIL|\ |
e838a45f MG |
23 | __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC|\ |
24 | __GFP_ATOMIC) | |
dd56b046 MG |
25 | |
26 | /* The GFP flags allowed during early boot */ | |
27 | #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS)) | |
28 | ||
29 | /* Control allocation cpuset and node placement constraints */ | |
30 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
31 | ||
32 | /* Do not use these with a slab allocator */ | |
33 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
34 | ||
62906027 NP |
35 | void page_writeback_init(void); |
36 | ||
2b740303 | 37 | vm_fault_t do_swap_page(struct vm_fault *vmf); |
8a966ed7 | 38 | |
42b77728 JB |
39 | void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
40 | unsigned long floor, unsigned long ceiling); | |
41 | ||
9c276cc6 | 42 | static inline bool can_madv_lru_vma(struct vm_area_struct *vma) |
23519073 KS |
43 | { |
44 | return !(vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP)); | |
45 | } | |
46 | ||
aac45363 MH |
47 | void unmap_page_range(struct mmu_gather *tlb, |
48 | struct vm_area_struct *vma, | |
49 | unsigned long addr, unsigned long end, | |
50 | struct zap_details *details); | |
51 | ||
7b3df3b9 DH |
52 | void do_page_cache_ra(struct readahead_control *, unsigned long nr_to_read, |
53 | unsigned long lookahead_size); | |
fcd9ae4f | 54 | void force_page_cache_ra(struct readahead_control *, unsigned long nr); |
7b3df3b9 DH |
55 | static inline void force_page_cache_readahead(struct address_space *mapping, |
56 | struct file *file, pgoff_t index, unsigned long nr_to_read) | |
57 | { | |
fcd9ae4f MWO |
58 | DEFINE_READAHEAD(ractl, file, &file->f_ra, mapping, index); |
59 | force_page_cache_ra(&ractl, nr_to_read); | |
7b3df3b9 | 60 | } |
29f175d1 | 61 | |
5c211ba2 MWO |
62 | unsigned find_lock_entries(struct address_space *mapping, pgoff_t start, |
63 | pgoff_t end, struct pagevec *pvec, pgoff_t *indices); | |
64 | ||
1eb6234e YS |
65 | /** |
66 | * page_evictable - test whether a page is evictable | |
67 | * @page: the page to test | |
68 | * | |
69 | * Test whether page is evictable--i.e., should be placed on active/inactive | |
70 | * lists vs unevictable list. | |
71 | * | |
72 | * Reasons page might not be evictable: | |
73 | * (1) page's mapping marked unevictable | |
74 | * (2) page is part of an mlocked VMA | |
75 | * | |
76 | */ | |
77 | static inline bool page_evictable(struct page *page) | |
78 | { | |
79 | bool ret; | |
80 | ||
81 | /* Prevent address_space of inode and swap cache from being freed */ | |
82 | rcu_read_lock(); | |
83 | ret = !mapping_unevictable(page_mapping(page)) && !PageMlocked(page); | |
84 | rcu_read_unlock(); | |
85 | return ret; | |
86 | } | |
87 | ||
7835e98b | 88 | /* |
0139aa7b | 89 | * Turn a non-refcounted page (->_refcount == 0) into refcounted with |
7835e98b NP |
90 | * a count of one. |
91 | */ | |
92 | static inline void set_page_refcounted(struct page *page) | |
93 | { | |
309381fe | 94 | VM_BUG_ON_PAGE(PageTail(page), page); |
fe896d18 | 95 | VM_BUG_ON_PAGE(page_ref_count(page), page); |
77a8a788 | 96 | set_page_count(page, 1); |
77a8a788 NP |
97 | } |
98 | ||
03f6462a HD |
99 | extern unsigned long highest_memmap_pfn; |
100 | ||
c73322d0 JW |
101 | /* |
102 | * Maximum number of reclaim retries without progress before the OOM | |
103 | * killer is consider the only way forward. | |
104 | */ | |
105 | #define MAX_RECLAIM_RETRIES 16 | |
106 | ||
894bc310 LS |
107 | /* |
108 | * in mm/vmscan.c: | |
109 | */ | |
62695a84 | 110 | extern int isolate_lru_page(struct page *page); |
894bc310 | 111 | extern void putback_lru_page(struct page *page); |
62695a84 | 112 | |
6219049a BL |
113 | /* |
114 | * in mm/rmap.c: | |
115 | */ | |
116 | extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); | |
117 | ||
494c1dfe WL |
118 | /* |
119 | * in mm/memcontrol.c: | |
120 | */ | |
121 | extern bool cgroup_memory_nokmem; | |
122 | ||
894bc310 LS |
123 | /* |
124 | * in mm/page_alloc.c | |
125 | */ | |
3c605096 | 126 | |
1a6d53a1 VB |
127 | /* |
128 | * Structure for holding the mostly immutable allocation parameters passed | |
129 | * between functions involved in allocations, including the alloc_pages* | |
130 | * family of functions. | |
131 | * | |
97a225e6 | 132 | * nodemask, migratetype and highest_zoneidx are initialized only once in |
84172f4b | 133 | * __alloc_pages() and then never change. |
1a6d53a1 | 134 | * |
97a225e6 | 135 | * zonelist, preferred_zone and highest_zoneidx are set first in |
84172f4b | 136 | * __alloc_pages() for the fast path, and might be later changed |
68956ccb | 137 | * in __alloc_pages_slowpath(). All other functions pass the whole structure |
1a6d53a1 VB |
138 | * by a const pointer. |
139 | */ | |
140 | struct alloc_context { | |
141 | struct zonelist *zonelist; | |
142 | nodemask_t *nodemask; | |
c33d6c06 | 143 | struct zoneref *preferred_zoneref; |
1a6d53a1 | 144 | int migratetype; |
97a225e6 JK |
145 | |
146 | /* | |
147 | * highest_zoneidx represents highest usable zone index of | |
148 | * the allocation request. Due to the nature of the zone, | |
149 | * memory on lower zone than the highest_zoneidx will be | |
150 | * protected by lowmem_reserve[highest_zoneidx]. | |
151 | * | |
152 | * highest_zoneidx is also used by reclaim/compaction to limit | |
153 | * the target zone since higher zone than this index cannot be | |
154 | * usable for this allocation request. | |
155 | */ | |
156 | enum zone_type highest_zoneidx; | |
c9ab0c4f | 157 | bool spread_dirty_pages; |
1a6d53a1 VB |
158 | }; |
159 | ||
3c605096 JK |
160 | /* |
161 | * Locate the struct page for both the matching buddy in our | |
162 | * pair (buddy1) and the combined O(n+1) page they form (page). | |
163 | * | |
164 | * 1) Any buddy B1 will have an order O twin B2 which satisfies | |
165 | * the following equation: | |
166 | * B2 = B1 ^ (1 << O) | |
167 | * For example, if the starting buddy (buddy2) is #8 its order | |
168 | * 1 buddy is #10: | |
169 | * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10 | |
170 | * | |
171 | * 2) Any buddy B will have an order O+1 parent P which | |
172 | * satisfies the following equation: | |
173 | * P = B & ~(1 << O) | |
174 | * | |
175 | * Assumption: *_mem_map is contiguous at least up to MAX_ORDER | |
176 | */ | |
177 | static inline unsigned long | |
76741e77 | 178 | __find_buddy_pfn(unsigned long page_pfn, unsigned int order) |
3c605096 | 179 | { |
76741e77 | 180 | return page_pfn ^ (1 << order); |
3c605096 JK |
181 | } |
182 | ||
7cf91a98 JK |
183 | extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn, |
184 | unsigned long end_pfn, struct zone *zone); | |
185 | ||
186 | static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn, | |
187 | unsigned long end_pfn, struct zone *zone) | |
188 | { | |
189 | if (zone->contiguous) | |
190 | return pfn_to_page(start_pfn); | |
191 | ||
192 | return __pageblock_pfn_to_page(start_pfn, end_pfn, zone); | |
193 | } | |
194 | ||
3c605096 | 195 | extern int __isolate_free_page(struct page *page, unsigned int order); |
624f58d8 AD |
196 | extern void __putback_isolated_page(struct page *page, unsigned int order, |
197 | int mt); | |
7c2ee349 | 198 | extern void memblock_free_pages(struct page *page, unsigned long pfn, |
d70ddd7a | 199 | unsigned int order); |
a9cd410a | 200 | extern void __free_pages_core(struct page *page, unsigned int order); |
d00181b9 | 201 | extern void prep_compound_page(struct page *page, unsigned int order); |
46f24fd8 JK |
202 | extern void post_alloc_hook(struct page *page, unsigned int order, |
203 | gfp_t gfp_flags); | |
42aa83cb | 204 | extern int user_min_free_kbytes; |
20a0307c | 205 | |
44042b44 | 206 | extern void free_unref_page(struct page *page, unsigned int order); |
0966aeb4 MWO |
207 | extern void free_unref_page_list(struct list_head *list); |
208 | ||
04f8cfea | 209 | extern void zone_pcp_update(struct zone *zone, int cpu_online); |
68265390 | 210 | extern void zone_pcp_reset(struct zone *zone); |
ec6e8c7e VB |
211 | extern void zone_pcp_disable(struct zone *zone); |
212 | extern void zone_pcp_enable(struct zone *zone); | |
68265390 | 213 | |
ff9543fd MN |
214 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA |
215 | ||
216 | /* | |
217 | * in mm/compaction.c | |
218 | */ | |
219 | /* | |
220 | * compact_control is used to track pages being migrated and the free pages | |
221 | * they are being migrated to during memory compaction. The free_pfn starts | |
222 | * at the end of a zone and migrate_pfn begins at the start. Movable pages | |
223 | * are moved to the end of a zone during a compaction run and the run | |
224 | * completes when free_pfn <= migrate_pfn | |
225 | */ | |
226 | struct compact_control { | |
227 | struct list_head freepages; /* List of free pages to migrate to */ | |
228 | struct list_head migratepages; /* List of pages being migrated */ | |
c5fbd937 MG |
229 | unsigned int nr_freepages; /* Number of isolated free pages */ |
230 | unsigned int nr_migratepages; /* Number of pages to migrate */ | |
ff9543fd | 231 | unsigned long free_pfn; /* isolate_freepages search base */ |
c2ad7a1f OS |
232 | /* |
233 | * Acts as an in/out parameter to page isolation for migration. | |
234 | * isolate_migratepages uses it as a search base. | |
235 | * isolate_migratepages_block will update the value to the next pfn | |
236 | * after the last isolated one. | |
237 | */ | |
238 | unsigned long migrate_pfn; | |
70b44595 | 239 | unsigned long fast_start_pfn; /* a pfn to start linear scan from */ |
c5943b9c MG |
240 | struct zone *zone; |
241 | unsigned long total_migrate_scanned; | |
242 | unsigned long total_free_scanned; | |
dbe2d4e4 MG |
243 | unsigned short fast_search_fail;/* failures to use free list searches */ |
244 | short search_order; /* order to start a fast search at */ | |
f25ba6dc VB |
245 | const gfp_t gfp_mask; /* gfp mask of a direct compactor */ |
246 | int order; /* order a direct compactor needs */ | |
d39773a0 | 247 | int migratetype; /* migratetype of direct compactor */ |
f25ba6dc | 248 | const unsigned int alloc_flags; /* alloc flags of a direct compactor */ |
97a225e6 | 249 | const int highest_zoneidx; /* zone index of a direct compactor */ |
e0b9daeb | 250 | enum migrate_mode mode; /* Async or sync migration mode */ |
bb13ffeb | 251 | bool ignore_skip_hint; /* Scan blocks even if marked skip */ |
2583d671 | 252 | bool no_set_skip_hint; /* Don't mark blocks for skipping */ |
9f7e3387 | 253 | bool ignore_block_suitable; /* Scan blocks considered unsuitable */ |
accf6242 | 254 | bool direct_compaction; /* False from kcompactd or /proc/... */ |
facdaa91 | 255 | bool proactive_compaction; /* kcompactd proactive compaction */ |
06ed2998 | 256 | bool whole_zone; /* Whole zone should/has been scanned */ |
c3486f53 | 257 | bool contended; /* Signal lock or sched contention */ |
804d3121 | 258 | bool rescan; /* Rescanning the same pageblock */ |
b06eda09 | 259 | bool alloc_contig; /* alloc_contig_range allocation */ |
ff9543fd MN |
260 | }; |
261 | ||
5e1f0f09 MG |
262 | /* |
263 | * Used in direct compaction when a page should be taken from the freelists | |
264 | * immediately when one is created during the free path. | |
265 | */ | |
266 | struct capture_control { | |
267 | struct compact_control *cc; | |
268 | struct page *page; | |
269 | }; | |
270 | ||
ff9543fd | 271 | unsigned long |
bb13ffeb MG |
272 | isolate_freepages_range(struct compact_control *cc, |
273 | unsigned long start_pfn, unsigned long end_pfn); | |
c2ad7a1f | 274 | int |
edc2ca61 VB |
275 | isolate_migratepages_range(struct compact_control *cc, |
276 | unsigned long low_pfn, unsigned long end_pfn); | |
ffd8f251 | 277 | #endif |
2149cdae JK |
278 | int find_suitable_fallback(struct free_area *area, unsigned int order, |
279 | int migratetype, bool only_stealable, bool *can_steal); | |
ff9543fd | 280 | |
48f13bf3 | 281 | /* |
6c14466c MG |
282 | * This function returns the order of a free page in the buddy system. In |
283 | * general, page_zone(page)->lock must be held by the caller to prevent the | |
284 | * page from being allocated in parallel and returning garbage as the order. | |
285 | * If a caller does not hold page_zone(page)->lock, it must guarantee that the | |
99c0fd5e | 286 | * page cannot be allocated or merged in parallel. Alternatively, it must |
ab130f91 | 287 | * handle invalid values gracefully, and use buddy_order_unsafe() below. |
48f13bf3 | 288 | */ |
ab130f91 | 289 | static inline unsigned int buddy_order(struct page *page) |
48f13bf3 | 290 | { |
572438f9 | 291 | /* PageBuddy() must be checked by the caller */ |
48f13bf3 MG |
292 | return page_private(page); |
293 | } | |
b5a0e011 | 294 | |
99c0fd5e | 295 | /* |
ab130f91 | 296 | * Like buddy_order(), but for callers who cannot afford to hold the zone lock. |
99c0fd5e VB |
297 | * PageBuddy() should be checked first by the caller to minimize race window, |
298 | * and invalid values must be handled gracefully. | |
299 | * | |
4db0c3c2 | 300 | * READ_ONCE is used so that if the caller assigns the result into a local |
99c0fd5e VB |
301 | * variable and e.g. tests it for valid range before using, the compiler cannot |
302 | * decide to remove the variable and inline the page_private(page) multiple | |
303 | * times, potentially observing different values in the tests and the actual | |
304 | * use of the result. | |
305 | */ | |
ab130f91 | 306 | #define buddy_order_unsafe(page) READ_ONCE(page_private(page)) |
99c0fd5e | 307 | |
30bdbb78 KK |
308 | /* |
309 | * These three helpers classifies VMAs for virtual memory accounting. | |
310 | */ | |
311 | ||
312 | /* | |
313 | * Executable code area - executable, not writable, not stack | |
314 | */ | |
d977d56c KK |
315 | static inline bool is_exec_mapping(vm_flags_t flags) |
316 | { | |
30bdbb78 | 317 | return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC; |
d977d56c KK |
318 | } |
319 | ||
30bdbb78 | 320 | /* |
f0953a1b | 321 | * Stack area - automatically grows in one direction |
30bdbb78 KK |
322 | * |
323 | * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous: | |
324 | * do_mmap() forbids all other combinations. | |
325 | */ | |
d977d56c KK |
326 | static inline bool is_stack_mapping(vm_flags_t flags) |
327 | { | |
30bdbb78 | 328 | return (flags & VM_STACK) == VM_STACK; |
d977d56c KK |
329 | } |
330 | ||
30bdbb78 KK |
331 | /* |
332 | * Data area - private, writable, not stack | |
333 | */ | |
d977d56c KK |
334 | static inline bool is_data_mapping(vm_flags_t flags) |
335 | { | |
30bdbb78 | 336 | return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE; |
d977d56c KK |
337 | } |
338 | ||
6038def0 NK |
339 | /* mm/util.c */ |
340 | void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, | |
aba6dfb7 | 341 | struct vm_area_struct *prev); |
1b9fc5b2 | 342 | void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma); |
6038def0 | 343 | |
af8e3354 | 344 | #ifdef CONFIG_MMU |
fc05f566 | 345 | extern long populate_vma_page_range(struct vm_area_struct *vma, |
a78f1ccd | 346 | unsigned long start, unsigned long end, int *locked); |
4ca9b385 DH |
347 | extern long faultin_vma_page_range(struct vm_area_struct *vma, |
348 | unsigned long start, unsigned long end, | |
349 | bool write, int *locked); | |
af8e3354 HD |
350 | extern void munlock_vma_pages_range(struct vm_area_struct *vma, |
351 | unsigned long start, unsigned long end); | |
352 | static inline void munlock_vma_pages_all(struct vm_area_struct *vma) | |
353 | { | |
354 | munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); | |
355 | } | |
356 | ||
b291f000 | 357 | /* |
c1e8d7c6 | 358 | * must be called with vma's mmap_lock held for read or write, and page locked. |
b291f000 NP |
359 | */ |
360 | extern void mlock_vma_page(struct page *page); | |
ff6a6da6 | 361 | extern unsigned int munlock_vma_page(struct page *page); |
b291f000 | 362 | |
6aeb2542 MR |
363 | extern int mlock_future_check(struct mm_struct *mm, unsigned long flags, |
364 | unsigned long len); | |
365 | ||
b291f000 NP |
366 | /* |
367 | * Clear the page's PageMlocked(). This can be useful in a situation where | |
368 | * we want to unconditionally remove a page from the pagecache -- e.g., | |
369 | * on truncation or freeing. | |
370 | * | |
371 | * It is legal to call this function for any page, mlocked or not. | |
372 | * If called for a page that is still mapped by mlocked vmas, all we do | |
373 | * is revert to lazy LRU behaviour -- semantics are not broken. | |
374 | */ | |
e6c509f8 | 375 | extern void clear_page_mlock(struct page *page); |
b291f000 | 376 | |
f55e1014 | 377 | extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); |
b32967ff | 378 | |
e9b61f19 | 379 | /* |
494334e4 HD |
380 | * At what user virtual address is page expected in vma? |
381 | * Returns -EFAULT if all of the page is outside the range of vma. | |
382 | * If page is a compound head, the entire compound page is considered. | |
e9b61f19 KS |
383 | */ |
384 | static inline unsigned long | |
494334e4 | 385 | vma_address(struct page *page, struct vm_area_struct *vma) |
e9b61f19 | 386 | { |
494334e4 HD |
387 | pgoff_t pgoff; |
388 | unsigned long address; | |
389 | ||
390 | VM_BUG_ON_PAGE(PageKsm(page), page); /* KSM page->index unusable */ | |
391 | pgoff = page_to_pgoff(page); | |
392 | if (pgoff >= vma->vm_pgoff) { | |
393 | address = vma->vm_start + | |
394 | ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); | |
395 | /* Check for address beyond vma (or wrapped through 0?) */ | |
396 | if (address < vma->vm_start || address >= vma->vm_end) | |
397 | address = -EFAULT; | |
398 | } else if (PageHead(page) && | |
399 | pgoff + compound_nr(page) - 1 >= vma->vm_pgoff) { | |
400 | /* Test above avoids possibility of wrap to 0 on 32-bit */ | |
401 | address = vma->vm_start; | |
402 | } else { | |
403 | address = -EFAULT; | |
404 | } | |
405 | return address; | |
e9b61f19 KS |
406 | } |
407 | ||
494334e4 HD |
408 | /* |
409 | * Then at what user virtual address will none of the page be found in vma? | |
410 | * Assumes that vma_address() already returned a good starting address. | |
411 | * If page is a compound head, the entire compound page is considered. | |
412 | */ | |
e9b61f19 | 413 | static inline unsigned long |
494334e4 | 414 | vma_address_end(struct page *page, struct vm_area_struct *vma) |
e9b61f19 | 415 | { |
494334e4 HD |
416 | pgoff_t pgoff; |
417 | unsigned long address; | |
418 | ||
419 | VM_BUG_ON_PAGE(PageKsm(page), page); /* KSM page->index unusable */ | |
420 | pgoff = page_to_pgoff(page) + compound_nr(page); | |
421 | address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); | |
422 | /* Check for address beyond vma (or wrapped through 0?) */ | |
423 | if (address < vma->vm_start || address > vma->vm_end) | |
424 | address = vma->vm_end; | |
425 | return address; | |
e9b61f19 KS |
426 | } |
427 | ||
89b15332 JW |
428 | static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf, |
429 | struct file *fpin) | |
430 | { | |
431 | int flags = vmf->flags; | |
432 | ||
433 | if (fpin) | |
434 | return fpin; | |
435 | ||
436 | /* | |
437 | * FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or | |
c1e8d7c6 | 438 | * anything, so we only pin the file and drop the mmap_lock if only |
4064b982 | 439 | * FAULT_FLAG_ALLOW_RETRY is set, while this is the first attempt. |
89b15332 | 440 | */ |
4064b982 PX |
441 | if (fault_flag_allow_retry_first(flags) && |
442 | !(flags & FAULT_FLAG_RETRY_NOWAIT)) { | |
89b15332 | 443 | fpin = get_file(vmf->vma->vm_file); |
d8ed45c5 | 444 | mmap_read_unlock(vmf->vma->vm_mm); |
89b15332 JW |
445 | } |
446 | return fpin; | |
447 | } | |
448 | ||
af8e3354 | 449 | #else /* !CONFIG_MMU */ |
b291f000 NP |
450 | static inline void clear_page_mlock(struct page *page) { } |
451 | static inline void mlock_vma_page(struct page *page) { } | |
4ad0ae8c NP |
452 | static inline void vunmap_range_noflush(unsigned long start, unsigned long end) |
453 | { | |
454 | } | |
af8e3354 | 455 | #endif /* !CONFIG_MMU */ |
894bc310 | 456 | |
69d177c2 AW |
457 | /* |
458 | * Return the mem_map entry representing the 'offset' subpage within | |
459 | * the maximally aligned gigantic page 'base'. Handle any discontiguity | |
460 | * in the mem_map at MAX_ORDER_NR_PAGES boundaries. | |
461 | */ | |
462 | static inline struct page *mem_map_offset(struct page *base, int offset) | |
463 | { | |
464 | if (unlikely(offset >= MAX_ORDER_NR_PAGES)) | |
bc7f84c0 | 465 | return nth_page(base, offset); |
69d177c2 AW |
466 | return base + offset; |
467 | } | |
468 | ||
469 | /* | |
25985edc | 470 | * Iterator over all subpages within the maximally aligned gigantic |
69d177c2 AW |
471 | * page 'base'. Handle any discontiguity in the mem_map. |
472 | */ | |
473 | static inline struct page *mem_map_next(struct page *iter, | |
474 | struct page *base, int offset) | |
475 | { | |
476 | if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { | |
477 | unsigned long pfn = page_to_pfn(base) + offset; | |
478 | if (!pfn_valid(pfn)) | |
479 | return NULL; | |
480 | return pfn_to_page(pfn); | |
481 | } | |
482 | return iter + 1; | |
483 | } | |
484 | ||
6b74ab97 MG |
485 | /* Memory initialisation debug and verification */ |
486 | enum mminit_level { | |
487 | MMINIT_WARNING, | |
488 | MMINIT_VERIFY, | |
489 | MMINIT_TRACE | |
490 | }; | |
491 | ||
492 | #ifdef CONFIG_DEBUG_MEMORY_INIT | |
493 | ||
494 | extern int mminit_loglevel; | |
495 | ||
496 | #define mminit_dprintk(level, prefix, fmt, arg...) \ | |
497 | do { \ | |
498 | if (level < mminit_loglevel) { \ | |
fc5199d1 | 499 | if (level <= MMINIT_WARNING) \ |
1170532b | 500 | pr_warn("mminit::" prefix " " fmt, ##arg); \ |
fc5199d1 RV |
501 | else \ |
502 | printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \ | |
6b74ab97 MG |
503 | } \ |
504 | } while (0) | |
505 | ||
708614e6 | 506 | extern void mminit_verify_pageflags_layout(void); |
68ad8df4 | 507 | extern void mminit_verify_zonelist(void); |
6b74ab97 MG |
508 | #else |
509 | ||
510 | static inline void mminit_dprintk(enum mminit_level level, | |
511 | const char *prefix, const char *fmt, ...) | |
512 | { | |
513 | } | |
514 | ||
708614e6 MG |
515 | static inline void mminit_verify_pageflags_layout(void) |
516 | { | |
517 | } | |
518 | ||
68ad8df4 MG |
519 | static inline void mminit_verify_zonelist(void) |
520 | { | |
521 | } | |
6b74ab97 | 522 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
2dbb51c4 MG |
523 | |
524 | /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ | |
525 | #if defined(CONFIG_SPARSEMEM) | |
526 | extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
527 | unsigned long *end_pfn); | |
528 | #else | |
529 | static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
530 | unsigned long *end_pfn) | |
531 | { | |
532 | } | |
533 | #endif /* CONFIG_SPARSEMEM */ | |
534 | ||
a5f5f91d MG |
535 | #define NODE_RECLAIM_NOSCAN -2 |
536 | #define NODE_RECLAIM_FULL -1 | |
537 | #define NODE_RECLAIM_SOME 0 | |
538 | #define NODE_RECLAIM_SUCCESS 1 | |
7c116f2b | 539 | |
8b09549c WY |
540 | #ifdef CONFIG_NUMA |
541 | extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int); | |
542 | #else | |
543 | static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask, | |
544 | unsigned int order) | |
545 | { | |
546 | return NODE_RECLAIM_NOSCAN; | |
547 | } | |
548 | #endif | |
549 | ||
31d3d348 WF |
550 | extern int hwpoison_filter(struct page *p); |
551 | ||
7c116f2b WF |
552 | extern u32 hwpoison_filter_dev_major; |
553 | extern u32 hwpoison_filter_dev_minor; | |
478c5ffc WF |
554 | extern u64 hwpoison_filter_flags_mask; |
555 | extern u64 hwpoison_filter_flags_value; | |
4fd466eb | 556 | extern u64 hwpoison_filter_memcg; |
1bfe5feb | 557 | extern u32 hwpoison_filter_enable; |
eb36c587 | 558 | |
dc0ef0df | 559 | extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long, |
eb36c587 | 560 | unsigned long, unsigned long, |
9fbeb5ab | 561 | unsigned long, unsigned long); |
ca57df79 XQ |
562 | |
563 | extern void set_pageblock_order(void); | |
730ec8c0 | 564 | unsigned int reclaim_clean_pages_from_list(struct zone *zone, |
02c6de8d | 565 | struct list_head *page_list); |
d95ea5d1 BZ |
566 | /* The ALLOC_WMARK bits are used as an index to zone->watermark */ |
567 | #define ALLOC_WMARK_MIN WMARK_MIN | |
568 | #define ALLOC_WMARK_LOW WMARK_LOW | |
569 | #define ALLOC_WMARK_HIGH WMARK_HIGH | |
570 | #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */ | |
571 | ||
572 | /* Mask to get the watermark bits */ | |
573 | #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1) | |
574 | ||
cd04ae1e MH |
575 | /* |
576 | * Only MMU archs have async oom victim reclaim - aka oom_reaper so we | |
577 | * cannot assume a reduced access to memory reserves is sufficient for | |
578 | * !MMU | |
579 | */ | |
580 | #ifdef CONFIG_MMU | |
581 | #define ALLOC_OOM 0x08 | |
582 | #else | |
583 | #define ALLOC_OOM ALLOC_NO_WATERMARKS | |
584 | #endif | |
585 | ||
6bb15450 MG |
586 | #define ALLOC_HARDER 0x10 /* try to alloc harder */ |
587 | #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ | |
588 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ | |
589 | #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */ | |
590 | #ifdef CONFIG_ZONE_DMA32 | |
591 | #define ALLOC_NOFRAGMENT 0x100 /* avoid mixing pageblock types */ | |
592 | #else | |
593 | #define ALLOC_NOFRAGMENT 0x0 | |
594 | #endif | |
736838e9 | 595 | #define ALLOC_KSWAPD 0x800 /* allow waking of kswapd, __GFP_KSWAPD_RECLAIM set */ |
d95ea5d1 | 596 | |
72b252ae MG |
597 | enum ttu_flags; |
598 | struct tlbflush_unmap_batch; | |
599 | ||
ce612879 MH |
600 | |
601 | /* | |
602 | * only for MM internal work items which do not depend on | |
603 | * any allocations or locks which might depend on allocations | |
604 | */ | |
605 | extern struct workqueue_struct *mm_percpu_wq; | |
606 | ||
72b252ae MG |
607 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
608 | void try_to_unmap_flush(void); | |
d950c947 | 609 | void try_to_unmap_flush_dirty(void); |
3ea27719 | 610 | void flush_tlb_batched_pending(struct mm_struct *mm); |
72b252ae MG |
611 | #else |
612 | static inline void try_to_unmap_flush(void) | |
613 | { | |
614 | } | |
d950c947 MG |
615 | static inline void try_to_unmap_flush_dirty(void) |
616 | { | |
617 | } | |
3ea27719 MG |
618 | static inline void flush_tlb_batched_pending(struct mm_struct *mm) |
619 | { | |
620 | } | |
72b252ae | 621 | #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */ |
edf14cdb VB |
622 | |
623 | extern const struct trace_print_flags pageflag_names[]; | |
624 | extern const struct trace_print_flags vmaflag_names[]; | |
625 | extern const struct trace_print_flags gfpflag_names[]; | |
626 | ||
a6ffdc07 XQ |
627 | static inline bool is_migrate_highatomic(enum migratetype migratetype) |
628 | { | |
629 | return migratetype == MIGRATE_HIGHATOMIC; | |
630 | } | |
631 | ||
632 | static inline bool is_migrate_highatomic_page(struct page *page) | |
633 | { | |
634 | return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC; | |
635 | } | |
636 | ||
72675e13 | 637 | void setup_zone_pageset(struct zone *zone); |
19fc7bed JK |
638 | |
639 | struct migration_target_control { | |
640 | int nid; /* preferred node id */ | |
641 | nodemask_t *nmask; | |
642 | gfp_t gfp_mask; | |
643 | }; | |
644 | ||
b67177ec NP |
645 | /* |
646 | * mm/vmalloc.c | |
647 | */ | |
4ad0ae8c | 648 | #ifdef CONFIG_MMU |
b67177ec NP |
649 | int vmap_pages_range_noflush(unsigned long addr, unsigned long end, |
650 | pgprot_t prot, struct page **pages, unsigned int page_shift); | |
4ad0ae8c NP |
651 | #else |
652 | static inline | |
653 | int vmap_pages_range_noflush(unsigned long addr, unsigned long end, | |
654 | pgprot_t prot, struct page **pages, unsigned int page_shift) | |
655 | { | |
656 | return -EINVAL; | |
657 | } | |
658 | #endif | |
659 | ||
660 | void vunmap_range_noflush(unsigned long start, unsigned long end); | |
b67177ec | 661 | |
f4c0d836 YS |
662 | int numa_migrate_prep(struct page *page, struct vm_area_struct *vma, |
663 | unsigned long addr, int page_nid, int *flags); | |
664 | ||
db971418 | 665 | #endif /* __MM_INTERNAL_H */ |