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1 : : /* SPDX-License-Identifier: GPL-2.0-or-later */
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)
6 : : */
7 : : #ifndef __MM_INTERNAL_H
8 : : #define __MM_INTERNAL_H
9 : :
10 : : #include <linux/fs.h>
11 : : #include <linux/mm.h>
12 : : #include <linux/pagemap.h>
13 : : #include <linux/tracepoint-defs.h>
14 : :
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|\
22 : : __GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NOFAIL|\
23 : : __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC|\
24 : : __GFP_ATOMIC)
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 : :
35 : : void page_writeback_init(void);
36 : :
37 : : vm_fault_t do_swap_page(struct vm_fault *vmf);
38 : :
39 : : void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
40 : : unsigned long floor, unsigned long ceiling);
41 : :
42 : 0 : static inline bool can_madv_lru_vma(struct vm_area_struct *vma)
43 : : {
44 [ # # # # : 0 : return !(vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP));
# # ]
45 : : }
46 : :
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 : :
52 : : extern unsigned int __do_page_cache_readahead(struct address_space *mapping,
53 : : struct file *filp, pgoff_t offset, unsigned long nr_to_read,
54 : : unsigned long lookahead_size);
55 : :
56 : : /*
57 : : * Submit IO for the read-ahead request in file_ra_state.
58 : : */
59 : 8483 : static inline unsigned long ra_submit(struct file_ra_state *ra,
60 : : struct address_space *mapping, struct file *filp)
61 : : {
62 : 8483 : return __do_page_cache_readahead(mapping, filp,
63 : 5610 : ra->start, ra->size, ra->async_size);
64 : : }
65 : :
66 : : /*
67 : : * Turn a non-refcounted page (->_refcount == 0) into refcounted with
68 : : * a count of one.
69 : : */
70 : 1318162 : static inline void set_page_refcounted(struct page *page)
71 : : {
72 : 1318162 : VM_BUG_ON_PAGE(PageTail(page), page);
73 : 1318162 : VM_BUG_ON_PAGE(page_ref_count(page), page);
74 : 1318162 : set_page_count(page, 1);
75 : : }
76 : :
77 : : extern unsigned long highest_memmap_pfn;
78 : :
79 : : /*
80 : : * Maximum number of reclaim retries without progress before the OOM
81 : : * killer is consider the only way forward.
82 : : */
83 : : #define MAX_RECLAIM_RETRIES 16
84 : :
85 : : /*
86 : : * in mm/vmscan.c:
87 : : */
88 : : extern int isolate_lru_page(struct page *page);
89 : : extern void putback_lru_page(struct page *page);
90 : :
91 : : /*
92 : : * in mm/rmap.c:
93 : : */
94 : : extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
95 : :
96 : : /*
97 : : * in mm/page_alloc.c
98 : : */
99 : :
100 : : /*
101 : : * Structure for holding the mostly immutable allocation parameters passed
102 : : * between functions involved in allocations, including the alloc_pages*
103 : : * family of functions.
104 : : *
105 : : * nodemask, migratetype and high_zoneidx are initialized only once in
106 : : * __alloc_pages_nodemask() and then never change.
107 : : *
108 : : * zonelist, preferred_zone and classzone_idx are set first in
109 : : * __alloc_pages_nodemask() for the fast path, and might be later changed
110 : : * in __alloc_pages_slowpath(). All other functions pass the whole strucure
111 : : * by a const pointer.
112 : : */
113 : : struct alloc_context {
114 : : struct zonelist *zonelist;
115 : : nodemask_t *nodemask;
116 : : struct zoneref *preferred_zoneref;
117 : : int migratetype;
118 : : enum zone_type high_zoneidx;
119 : : bool spread_dirty_pages;
120 : : };
121 : :
122 : : #define ac_classzone_idx(ac) zonelist_zone_idx(ac->preferred_zoneref)
123 : :
124 : : /*
125 : : * Locate the struct page for both the matching buddy in our
126 : : * pair (buddy1) and the combined O(n+1) page they form (page).
127 : : *
128 : : * 1) Any buddy B1 will have an order O twin B2 which satisfies
129 : : * the following equation:
130 : : * B2 = B1 ^ (1 << O)
131 : : * For example, if the starting buddy (buddy2) is #8 its order
132 : : * 1 buddy is #10:
133 : : * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10
134 : : *
135 : : * 2) Any buddy B will have an order O+1 parent P which
136 : : * satisfies the following equation:
137 : : * P = B & ~(1 << O)
138 : : *
139 : : * Assumption: *_mem_map is contiguous at least up to MAX_ORDER
140 : : */
141 : : static inline unsigned long
142 : 939417 : __find_buddy_pfn(unsigned long page_pfn, unsigned int order)
143 : : {
144 [ + + + + ]: 939417 : return page_pfn ^ (1 << order);
145 : : }
146 : :
147 : : extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
148 : : unsigned long end_pfn, struct zone *zone);
149 : :
150 : 0 : static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn,
151 : : unsigned long end_pfn, struct zone *zone)
152 : : {
153 [ # # # # : 0 : if (zone->contiguous)
# # # # ]
154 : 0 : return pfn_to_page(start_pfn);
155 : :
156 : 0 : return __pageblock_pfn_to_page(start_pfn, end_pfn, zone);
157 : : }
158 : :
159 : : extern int __isolate_free_page(struct page *page, unsigned int order);
160 : : extern void memblock_free_pages(struct page *page, unsigned long pfn,
161 : : unsigned int order);
162 : : extern void __free_pages_core(struct page *page, unsigned int order);
163 : : extern void prep_compound_page(struct page *page, unsigned int order);
164 : : extern void post_alloc_hook(struct page *page, unsigned int order,
165 : : gfp_t gfp_flags);
166 : : extern int user_min_free_kbytes;
167 : :
168 : : extern void zone_pcp_update(struct zone *zone);
169 : : extern void zone_pcp_reset(struct zone *zone);
170 : :
171 : : #if defined CONFIG_COMPACTION || defined CONFIG_CMA
172 : :
173 : : /*
174 : : * in mm/compaction.c
175 : : */
176 : : /*
177 : : * compact_control is used to track pages being migrated and the free pages
178 : : * they are being migrated to during memory compaction. The free_pfn starts
179 : : * at the end of a zone and migrate_pfn begins at the start. Movable pages
180 : : * are moved to the end of a zone during a compaction run and the run
181 : : * completes when free_pfn <= migrate_pfn
182 : : */
183 : : struct compact_control {
184 : : struct list_head freepages; /* List of free pages to migrate to */
185 : : struct list_head migratepages; /* List of pages being migrated */
186 : : unsigned int nr_freepages; /* Number of isolated free pages */
187 : : unsigned int nr_migratepages; /* Number of pages to migrate */
188 : : unsigned long free_pfn; /* isolate_freepages search base */
189 : : unsigned long migrate_pfn; /* isolate_migratepages search base */
190 : : unsigned long fast_start_pfn; /* a pfn to start linear scan from */
191 : : struct zone *zone;
192 : : unsigned long total_migrate_scanned;
193 : : unsigned long total_free_scanned;
194 : : unsigned short fast_search_fail;/* failures to use free list searches */
195 : : short search_order; /* order to start a fast search at */
196 : : const gfp_t gfp_mask; /* gfp mask of a direct compactor */
197 : : int order; /* order a direct compactor needs */
198 : : int migratetype; /* migratetype of direct compactor */
199 : : const unsigned int alloc_flags; /* alloc flags of a direct compactor */
200 : : const int classzone_idx; /* zone index of a direct compactor */
201 : : enum migrate_mode mode; /* Async or sync migration mode */
202 : : bool ignore_skip_hint; /* Scan blocks even if marked skip */
203 : : bool no_set_skip_hint; /* Don't mark blocks for skipping */
204 : : bool ignore_block_suitable; /* Scan blocks considered unsuitable */
205 : : bool direct_compaction; /* False from kcompactd or /proc/... */
206 : : bool whole_zone; /* Whole zone should/has been scanned */
207 : : bool contended; /* Signal lock or sched contention */
208 : : bool rescan; /* Rescanning the same pageblock */
209 : : };
210 : :
211 : : /*
212 : : * Used in direct compaction when a page should be taken from the freelists
213 : : * immediately when one is created during the free path.
214 : : */
215 : : struct capture_control {
216 : : struct compact_control *cc;
217 : : struct page *page;
218 : : };
219 : :
220 : : unsigned long
221 : : isolate_freepages_range(struct compact_control *cc,
222 : : unsigned long start_pfn, unsigned long end_pfn);
223 : : unsigned long
224 : : isolate_migratepages_range(struct compact_control *cc,
225 : : unsigned long low_pfn, unsigned long end_pfn);
226 : : int find_suitable_fallback(struct free_area *area, unsigned int order,
227 : : int migratetype, bool only_stealable, bool *can_steal);
228 : :
229 : : #endif
230 : :
231 : : /*
232 : : * This function returns the order of a free page in the buddy system. In
233 : : * general, page_zone(page)->lock must be held by the caller to prevent the
234 : : * page from being allocated in parallel and returning garbage as the order.
235 : : * If a caller does not hold page_zone(page)->lock, it must guarantee that the
236 : : * page cannot be allocated or merged in parallel. Alternatively, it must
237 : : * handle invalid values gracefully, and use page_order_unsafe() below.
238 : : */
239 : 255711 : static inline unsigned int page_order(struct page *page)
240 : : {
241 : : /* PageBuddy() must be checked by the caller */
242 [ - - - + : 255711 : return page_private(page);
+ + + + ]
243 : : }
244 : :
245 : : /*
246 : : * Like page_order(), but for callers who cannot afford to hold the zone lock.
247 : : * PageBuddy() should be checked first by the caller to minimize race window,
248 : : * and invalid values must be handled gracefully.
249 : : *
250 : : * READ_ONCE is used so that if the caller assigns the result into a local
251 : : * variable and e.g. tests it for valid range before using, the compiler cannot
252 : : * decide to remove the variable and inline the page_private(page) multiple
253 : : * times, potentially observing different values in the tests and the actual
254 : : * use of the result.
255 : : */
256 : : #define page_order_unsafe(page) READ_ONCE(page_private(page))
257 : :
258 : 872868 : static inline bool is_cow_mapping(vm_flags_t flags)
259 : : {
260 [ - - - + : 872868 : return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
+ + - - +
+ ]
261 : : }
262 : :
263 : : /*
264 : : * These three helpers classifies VMAs for virtual memory accounting.
265 : : */
266 : :
267 : : /*
268 : : * Executable code area - executable, not writable, not stack
269 : : */
270 : 596778 : static inline bool is_exec_mapping(vm_flags_t flags)
271 : : {
272 [ + + + + : 596778 : return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC;
+ + - + +
+ ]
273 : : }
274 : :
275 : : /*
276 : : * Stack area - atomatically grows in one direction
277 : : *
278 : : * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
279 : : * do_mmap() forbids all other combinations.
280 : : */
281 : 528435 : static inline bool is_stack_mapping(vm_flags_t flags)
282 : : {
283 [ - + - + : 528435 : return (flags & VM_STACK) == VM_STACK;
- + + - -
+ ]
284 : : }
285 : :
286 : : /*
287 : : * Data area - private, writable, not stack
288 : : */
289 : 855885 : static inline bool is_data_mapping(vm_flags_t flags)
290 : : {
291 [ - + + + : 855885 : return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE;
+ + + + -
- + + ]
292 : : }
293 : :
294 : : /* mm/util.c */
295 : : void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
296 : : struct vm_area_struct *prev);
297 : : void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma);
298 : :
299 : : #ifdef CONFIG_MMU
300 : : extern long populate_vma_page_range(struct vm_area_struct *vma,
301 : : unsigned long start, unsigned long end, int *nonblocking);
302 : : extern void munlock_vma_pages_range(struct vm_area_struct *vma,
303 : : unsigned long start, unsigned long end);
304 : 0 : static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
305 : : {
306 : 0 : munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
307 : 0 : }
308 : :
309 : : /*
310 : : * must be called with vma's mmap_sem held for read or write, and page locked.
311 : : */
312 : : extern void mlock_vma_page(struct page *page);
313 : : extern unsigned int munlock_vma_page(struct page *page);
314 : :
315 : : /*
316 : : * Clear the page's PageMlocked(). This can be useful in a situation where
317 : : * we want to unconditionally remove a page from the pagecache -- e.g.,
318 : : * on truncation or freeing.
319 : : *
320 : : * It is legal to call this function for any page, mlocked or not.
321 : : * If called for a page that is still mapped by mlocked vmas, all we do
322 : : * is revert to lazy LRU behaviour -- semantics are not broken.
323 : : */
324 : : extern void clear_page_mlock(struct page *page);
325 : :
326 : : /*
327 : : * mlock_migrate_page - called only from migrate_misplaced_transhuge_page()
328 : : * (because that does not go through the full procedure of migration ptes):
329 : : * to migrate the Mlocked page flag; update statistics.
330 : : */
331 : : static inline void mlock_migrate_page(struct page *newpage, struct page *page)
332 : : {
333 : : if (TestClearPageMlocked(page)) {
334 : : int nr_pages = hpage_nr_pages(page);
335 : :
336 : : /* Holding pmd lock, no change in irq context: __mod is safe */
337 : : __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
338 : : SetPageMlocked(newpage);
339 : : __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
340 : : }
341 : : }
342 : :
343 : : extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
344 : :
345 : : /*
346 : : * At what user virtual address is page expected in @vma?
347 : : */
348 : : static inline unsigned long
349 : 0 : __vma_address(struct page *page, struct vm_area_struct *vma)
350 : : {
351 : 0 : pgoff_t pgoff = page_to_pgoff(page);
352 [ # # ]: 0 : return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
353 : : }
354 : :
355 : : static inline unsigned long
356 : 0 : vma_address(struct page *page, struct vm_area_struct *vma)
357 : : {
358 : 0 : unsigned long start, end;
359 : :
360 : 0 : start = __vma_address(page, vma);
361 : 0 : end = start + PAGE_SIZE * (hpage_nr_pages(page) - 1);
362 : :
363 : : /* page should be within @vma mapping range */
364 : 0 : VM_BUG_ON_VMA(end < vma->vm_start || start >= vma->vm_end, vma);
365 : :
366 : 0 : return max(start, vma->vm_start);
367 : : }
368 : :
369 : : static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
370 : : struct file *fpin)
371 : : {
372 : : int flags = vmf->flags;
373 : :
374 : : if (fpin)
375 : : return fpin;
376 : :
377 : : /*
378 : : * FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or
379 : : * anything, so we only pin the file and drop the mmap_sem if only
380 : : * FAULT_FLAG_ALLOW_RETRY is set.
381 : : */
382 : : if ((flags & (FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_RETRY_NOWAIT)) ==
383 : : FAULT_FLAG_ALLOW_RETRY) {
384 : : fpin = get_file(vmf->vma->vm_file);
385 : : up_read(&vmf->vma->vm_mm->mmap_sem);
386 : : }
387 : : return fpin;
388 : : }
389 : :
390 : : #else /* !CONFIG_MMU */
391 : : static inline void clear_page_mlock(struct page *page) { }
392 : : static inline void mlock_vma_page(struct page *page) { }
393 : : static inline void mlock_migrate_page(struct page *new, struct page *old) { }
394 : :
395 : : #endif /* !CONFIG_MMU */
396 : :
397 : : /*
398 : : * Return the mem_map entry representing the 'offset' subpage within
399 : : * the maximally aligned gigantic page 'base'. Handle any discontiguity
400 : : * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
401 : : */
402 : 0 : static inline struct page *mem_map_offset(struct page *base, int offset)
403 : : {
404 [ # # ]: 0 : if (unlikely(offset >= MAX_ORDER_NR_PAGES))
405 : 0 : return nth_page(base, offset);
406 : 0 : return base + offset;
407 : : }
408 : :
409 : : /*
410 : : * Iterator over all subpages within the maximally aligned gigantic
411 : : * page 'base'. Handle any discontiguity in the mem_map.
412 : : */
413 : 0 : static inline struct page *mem_map_next(struct page *iter,
414 : : struct page *base, int offset)
415 : : {
416 [ # # ]: 0 : if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
417 : 0 : unsigned long pfn = page_to_pfn(base) + offset;
418 [ # # ]: 0 : if (!pfn_valid(pfn))
419 : : return NULL;
420 : 0 : return pfn_to_page(pfn);
421 : : }
422 : 0 : return iter + 1;
423 : : }
424 : :
425 : : /* Memory initialisation debug and verification */
426 : : enum mminit_level {
427 : : MMINIT_WARNING,
428 : : MMINIT_VERIFY,
429 : : MMINIT_TRACE
430 : : };
431 : :
432 : : #ifdef CONFIG_DEBUG_MEMORY_INIT
433 : :
434 : : extern int mminit_loglevel;
435 : :
436 : : #define mminit_dprintk(level, prefix, fmt, arg...) \
437 : : do { \
438 : : if (level < mminit_loglevel) { \
439 : : if (level <= MMINIT_WARNING) \
440 : : pr_warn("mminit::" prefix " " fmt, ##arg); \
441 : : else \
442 : : printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
443 : : } \
444 : : } while (0)
445 : :
446 : : extern void mminit_verify_pageflags_layout(void);
447 : : extern void mminit_verify_zonelist(void);
448 : : #else
449 : :
450 : : static inline void mminit_dprintk(enum mminit_level level,
451 : : const char *prefix, const char *fmt, ...)
452 : : {
453 : : }
454 : :
455 : : static inline void mminit_verify_pageflags_layout(void)
456 : : {
457 : : }
458 : :
459 : : static inline void mminit_verify_zonelist(void)
460 : : {
461 : : }
462 : : #endif /* CONFIG_DEBUG_MEMORY_INIT */
463 : :
464 : : /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
465 : : #if defined(CONFIG_SPARSEMEM)
466 : : extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
467 : : unsigned long *end_pfn);
468 : : #else
469 : : static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
470 : : unsigned long *end_pfn)
471 : : {
472 : : }
473 : : #endif /* CONFIG_SPARSEMEM */
474 : :
475 : : #define NODE_RECLAIM_NOSCAN -2
476 : : #define NODE_RECLAIM_FULL -1
477 : : #define NODE_RECLAIM_SOME 0
478 : : #define NODE_RECLAIM_SUCCESS 1
479 : :
480 : : #ifdef CONFIG_NUMA
481 : : extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int);
482 : : #else
483 : : static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask,
484 : : unsigned int order)
485 : : {
486 : : return NODE_RECLAIM_NOSCAN;
487 : : }
488 : : #endif
489 : :
490 : : extern int hwpoison_filter(struct page *p);
491 : :
492 : : extern u32 hwpoison_filter_dev_major;
493 : : extern u32 hwpoison_filter_dev_minor;
494 : : extern u64 hwpoison_filter_flags_mask;
495 : : extern u64 hwpoison_filter_flags_value;
496 : : extern u64 hwpoison_filter_memcg;
497 : : extern u32 hwpoison_filter_enable;
498 : :
499 : : extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long,
500 : : unsigned long, unsigned long,
501 : : unsigned long, unsigned long);
502 : :
503 : : extern void set_pageblock_order(void);
504 : : unsigned long reclaim_clean_pages_from_list(struct zone *zone,
505 : : struct list_head *page_list);
506 : : /* The ALLOC_WMARK bits are used as an index to zone->watermark */
507 : : #define ALLOC_WMARK_MIN WMARK_MIN
508 : : #define ALLOC_WMARK_LOW WMARK_LOW
509 : : #define ALLOC_WMARK_HIGH WMARK_HIGH
510 : : #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
511 : :
512 : : /* Mask to get the watermark bits */
513 : : #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
514 : :
515 : : /*
516 : : * Only MMU archs have async oom victim reclaim - aka oom_reaper so we
517 : : * cannot assume a reduced access to memory reserves is sufficient for
518 : : * !MMU
519 : : */
520 : : #ifdef CONFIG_MMU
521 : : #define ALLOC_OOM 0x08
522 : : #else
523 : : #define ALLOC_OOM ALLOC_NO_WATERMARKS
524 : : #endif
525 : :
526 : : #define ALLOC_HARDER 0x10 /* try to alloc harder */
527 : : #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */
528 : : #define ALLOC_CPUSET 0x40 /* check for correct cpuset */
529 : : #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
530 : : #ifdef CONFIG_ZONE_DMA32
531 : : #define ALLOC_NOFRAGMENT 0x100 /* avoid mixing pageblock types */
532 : : #else
533 : : #define ALLOC_NOFRAGMENT 0x0
534 : : #endif
535 : : #define ALLOC_KSWAPD 0x200 /* allow waking of kswapd */
536 : :
537 : : enum ttu_flags;
538 : : struct tlbflush_unmap_batch;
539 : :
540 : :
541 : : /*
542 : : * only for MM internal work items which do not depend on
543 : : * any allocations or locks which might depend on allocations
544 : : */
545 : : extern struct workqueue_struct *mm_percpu_wq;
546 : :
547 : : #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
548 : : void try_to_unmap_flush(void);
549 : : void try_to_unmap_flush_dirty(void);
550 : : void flush_tlb_batched_pending(struct mm_struct *mm);
551 : : #else
552 : : static inline void try_to_unmap_flush(void)
553 : : {
554 : : }
555 : : static inline void try_to_unmap_flush_dirty(void)
556 : : {
557 : : }
558 : : static inline void flush_tlb_batched_pending(struct mm_struct *mm)
559 : : {
560 : : }
561 : : #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
562 : :
563 : : extern const struct trace_print_flags pageflag_names[];
564 : : extern const struct trace_print_flags vmaflag_names[];
565 : : extern const struct trace_print_flags gfpflag_names[];
566 : :
567 : 242 : static inline bool is_migrate_highatomic(enum migratetype migratetype)
568 : : {
569 [ - - - + ]: 242 : return migratetype == MIGRATE_HIGHATOMIC;
570 : : }
571 : :
572 : 0 : static inline bool is_migrate_highatomic_page(struct page *page)
573 : : {
574 [ # # ]: 0 : return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC;
575 : : }
576 : :
577 : : void setup_zone_pageset(struct zone *zone);
578 : : extern struct page *alloc_new_node_page(struct page *page, unsigned long node);
579 : : #endif /* __MM_INTERNAL_H */
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