1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* internal.h: mm/ internal definitions
4 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
7 #ifndef __MM_INTERNAL_H
8 #define __MM_INTERNAL_H
12 #include <linux/pagemap.h>
13 #include <linux/rmap.h>
14 #include <linux/tracepoint-defs.h>
19 * The set of flags that only affect watermark checking and reclaim
20 * behaviour. This is used by the MM to obey the caller constraints
21 * about IO, FS and watermark checking while ignoring placement
22 * hints such as HIGHMEM usage.
24 #define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\
25 __GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NOFAIL|\
26 __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC|\
29 /* The GFP flags allowed during early boot */
30 #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS))
32 /* Control allocation cpuset and node placement constraints */
33 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
35 /* Do not use these with a slab allocator */
36 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
39 * Different from WARN_ON_ONCE(), no warning will be issued
40 * when we specify __GFP_NOWARN.
42 #define WARN_ON_ONCE_GFP(cond, gfp) ({ \
43 static bool __section(".data.once") __warned; \
44 int __ret_warn_once = !!(cond); \
46 if (unlikely(!(gfp & __GFP_NOWARN) && __ret_warn_once && !__warned)) { \
50 unlikely(__ret_warn_once); \
53 void page_writeback_init(void);
56 * If a 16GB hugetlb folio were mapped by PTEs of all of its 4kB pages,
57 * its nr_pages_mapped would be 0x400000: choose the COMPOUND_MAPPED bit
58 * above that range, instead of 2*(PMD_SIZE/PAGE_SIZE). Hugetlb currently
59 * leaves nr_pages_mapped at 0, but avoid surprise if it participates later.
61 #define COMPOUND_MAPPED 0x800000
62 #define FOLIO_PAGES_MAPPED (COMPOUND_MAPPED - 1)
65 * How many individual pages have an elevated _mapcount. Excludes
66 * the folio's entire_mapcount.
68 static inline int folio_nr_pages_mapped(struct folio
*folio
)
70 return atomic_read(&folio
->_nr_pages_mapped
) & FOLIO_PAGES_MAPPED
;
73 static inline void *folio_raw_mapping(struct folio
*folio
)
75 unsigned long mapping
= (unsigned long)folio
->mapping
;
77 return (void *)(mapping
& ~PAGE_MAPPING_FLAGS
);
80 void __acct_reclaim_writeback(pg_data_t
*pgdat
, struct folio
*folio
,
82 static inline void acct_reclaim_writeback(struct folio
*folio
)
84 pg_data_t
*pgdat
= folio_pgdat(folio
);
85 int nr_throttled
= atomic_read(&pgdat
->nr_writeback_throttled
);
88 __acct_reclaim_writeback(pgdat
, folio
, nr_throttled
);
91 static inline void wake_throttle_isolated(pg_data_t
*pgdat
)
93 wait_queue_head_t
*wqh
;
95 wqh
= &pgdat
->reclaim_wait
[VMSCAN_THROTTLE_ISOLATED
];
96 if (waitqueue_active(wqh
))
100 vm_fault_t
do_swap_page(struct vm_fault
*vmf
);
101 void folio_rotate_reclaimable(struct folio
*folio
);
102 bool __folio_end_writeback(struct folio
*folio
);
103 void deactivate_file_folio(struct folio
*folio
);
104 void folio_activate(struct folio
*folio
);
106 void free_pgtables(struct mmu_gather
*tlb
, struct maple_tree
*mt
,
107 struct vm_area_struct
*start_vma
, unsigned long floor
,
108 unsigned long ceiling
, bool mm_wr_locked
);
109 void pmd_install(struct mm_struct
*mm
, pmd_t
*pmd
, pgtable_t
*pte
);
112 void unmap_page_range(struct mmu_gather
*tlb
,
113 struct vm_area_struct
*vma
,
114 unsigned long addr
, unsigned long end
,
115 struct zap_details
*details
);
117 void page_cache_ra_order(struct readahead_control
*, struct file_ra_state
*,
119 void force_page_cache_ra(struct readahead_control
*, unsigned long nr
);
120 static inline void force_page_cache_readahead(struct address_space
*mapping
,
121 struct file
*file
, pgoff_t index
, unsigned long nr_to_read
)
123 DEFINE_READAHEAD(ractl
, file
, &file
->f_ra
, mapping
, index
);
124 force_page_cache_ra(&ractl
, nr_to_read
);
127 unsigned find_lock_entries(struct address_space
*mapping
, pgoff_t
*start
,
128 pgoff_t end
, struct folio_batch
*fbatch
, pgoff_t
*indices
);
129 unsigned find_get_entries(struct address_space
*mapping
, pgoff_t
*start
,
130 pgoff_t end
, struct folio_batch
*fbatch
, pgoff_t
*indices
);
131 void filemap_free_folio(struct address_space
*mapping
, struct folio
*folio
);
132 int truncate_inode_folio(struct address_space
*mapping
, struct folio
*folio
);
133 bool truncate_inode_partial_folio(struct folio
*folio
, loff_t start
,
135 long invalidate_inode_page(struct page
*page
);
136 unsigned long mapping_try_invalidate(struct address_space
*mapping
,
137 pgoff_t start
, pgoff_t end
, unsigned long *nr_failed
);
140 * folio_evictable - Test whether a folio is evictable.
141 * @folio: The folio to test.
143 * Test whether @folio is evictable -- i.e., should be placed on
144 * active/inactive lists vs unevictable list.
146 * Reasons folio might not be evictable:
147 * 1. folio's mapping marked unevictable
148 * 2. One of the pages in the folio is part of an mlocked VMA
150 static inline bool folio_evictable(struct folio
*folio
)
154 /* Prevent address_space of inode and swap cache from being freed */
156 ret
= !mapping_unevictable(folio_mapping(folio
)) &&
157 !folio_test_mlocked(folio
);
163 * Turn a non-refcounted page (->_refcount == 0) into refcounted with
166 static inline void set_page_refcounted(struct page
*page
)
168 VM_BUG_ON_PAGE(PageTail(page
), page
);
169 VM_BUG_ON_PAGE(page_ref_count(page
), page
);
170 set_page_count(page
, 1);
173 extern unsigned long highest_memmap_pfn
;
176 * Maximum number of reclaim retries without progress before the OOM
177 * killer is consider the only way forward.
179 #define MAX_RECLAIM_RETRIES 16
184 bool isolate_lru_page(struct page
*page
);
185 bool folio_isolate_lru(struct folio
*folio
);
186 void putback_lru_page(struct page
*page
);
187 void folio_putback_lru(struct folio
*folio
);
188 extern void reclaim_throttle(pg_data_t
*pgdat
, enum vmscan_throttle_state reason
);
193 pmd_t
*mm_find_pmd(struct mm_struct
*mm
, unsigned long address
);
198 #define K(x) ((x) << (PAGE_SHIFT-10))
200 extern char * const zone_names
[MAX_NR_ZONES
];
202 /* perform sanity checks on struct pages being allocated or freed */
203 DECLARE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM
, check_pages_enabled
);
205 extern int min_free_kbytes
;
207 void setup_per_zone_wmarks(void);
208 void calculate_min_free_kbytes(void);
209 int __meminit
init_per_zone_wmark_min(void);
210 void page_alloc_sysctl_init(void);
213 * Structure for holding the mostly immutable allocation parameters passed
214 * between functions involved in allocations, including the alloc_pages*
215 * family of functions.
217 * nodemask, migratetype and highest_zoneidx are initialized only once in
218 * __alloc_pages() and then never change.
220 * zonelist, preferred_zone and highest_zoneidx are set first in
221 * __alloc_pages() for the fast path, and might be later changed
222 * in __alloc_pages_slowpath(). All other functions pass the whole structure
223 * by a const pointer.
225 struct alloc_context
{
226 struct zonelist
*zonelist
;
227 nodemask_t
*nodemask
;
228 struct zoneref
*preferred_zoneref
;
232 * highest_zoneidx represents highest usable zone index of
233 * the allocation request. Due to the nature of the zone,
234 * memory on lower zone than the highest_zoneidx will be
235 * protected by lowmem_reserve[highest_zoneidx].
237 * highest_zoneidx is also used by reclaim/compaction to limit
238 * the target zone since higher zone than this index cannot be
239 * usable for this allocation request.
241 enum zone_type highest_zoneidx
;
242 bool spread_dirty_pages
;
246 * This function returns the order of a free page in the buddy system. In
247 * general, page_zone(page)->lock must be held by the caller to prevent the
248 * page from being allocated in parallel and returning garbage as the order.
249 * If a caller does not hold page_zone(page)->lock, it must guarantee that the
250 * page cannot be allocated or merged in parallel. Alternatively, it must
251 * handle invalid values gracefully, and use buddy_order_unsafe() below.
253 static inline unsigned int buddy_order(struct page
*page
)
255 /* PageBuddy() must be checked by the caller */
256 return page_private(page
);
260 * Like buddy_order(), but for callers who cannot afford to hold the zone lock.
261 * PageBuddy() should be checked first by the caller to minimize race window,
262 * and invalid values must be handled gracefully.
264 * READ_ONCE is used so that if the caller assigns the result into a local
265 * variable and e.g. tests it for valid range before using, the compiler cannot
266 * decide to remove the variable and inline the page_private(page) multiple
267 * times, potentially observing different values in the tests and the actual
270 #define buddy_order_unsafe(page) READ_ONCE(page_private(page))
273 * This function checks whether a page is free && is the buddy
274 * we can coalesce a page and its buddy if
275 * (a) the buddy is not in a hole (check before calling!) &&
276 * (b) the buddy is in the buddy system &&
277 * (c) a page and its buddy have the same order &&
278 * (d) a page and its buddy are in the same zone.
280 * For recording whether a page is in the buddy system, we set PageBuddy.
281 * Setting, clearing, and testing PageBuddy is serialized by zone->lock.
283 * For recording page's order, we use page_private(page).
285 static inline bool page_is_buddy(struct page
*page
, struct page
*buddy
,
288 if (!page_is_guard(buddy
) && !PageBuddy(buddy
))
291 if (buddy_order(buddy
) != order
)
295 * zone check is done late to avoid uselessly calculating
296 * zone/node ids for pages that could never merge.
298 if (page_zone_id(page
) != page_zone_id(buddy
))
301 VM_BUG_ON_PAGE(page_count(buddy
) != 0, buddy
);
307 * Locate the struct page for both the matching buddy in our
308 * pair (buddy1) and the combined O(n+1) page they form (page).
310 * 1) Any buddy B1 will have an order O twin B2 which satisfies
311 * the following equation:
313 * For example, if the starting buddy (buddy2) is #8 its order
315 * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10
317 * 2) Any buddy B will have an order O+1 parent P which
318 * satisfies the following equation:
321 * Assumption: *_mem_map is contiguous at least up to MAX_ORDER
323 static inline unsigned long
324 __find_buddy_pfn(unsigned long page_pfn
, unsigned int order
)
326 return page_pfn
^ (1 << order
);
330 * Find the buddy of @page and validate it.
331 * @page: The input page
332 * @pfn: The pfn of the page, it saves a call to page_to_pfn() when the
333 * function is used in the performance-critical __free_one_page().
334 * @order: The order of the page
335 * @buddy_pfn: The output pointer to the buddy pfn, it also saves a call to
338 * The found buddy can be a non PageBuddy, out of @page's zone, or its order is
339 * not the same as @page. The validation is necessary before use it.
341 * Return: the found buddy page or NULL if not found.
343 static inline struct page
*find_buddy_page_pfn(struct page
*page
,
344 unsigned long pfn
, unsigned int order
, unsigned long *buddy_pfn
)
346 unsigned long __buddy_pfn
= __find_buddy_pfn(pfn
, order
);
349 buddy
= page
+ (__buddy_pfn
- pfn
);
351 *buddy_pfn
= __buddy_pfn
;
353 if (page_is_buddy(page
, buddy
, order
))
358 extern struct page
*__pageblock_pfn_to_page(unsigned long start_pfn
,
359 unsigned long end_pfn
, struct zone
*zone
);
361 static inline struct page
*pageblock_pfn_to_page(unsigned long start_pfn
,
362 unsigned long end_pfn
, struct zone
*zone
)
364 if (zone
->contiguous
)
365 return pfn_to_page(start_pfn
);
367 return __pageblock_pfn_to_page(start_pfn
, end_pfn
, zone
);
370 void set_zone_contiguous(struct zone
*zone
);
372 static inline void clear_zone_contiguous(struct zone
*zone
)
374 zone
->contiguous
= false;
377 extern int __isolate_free_page(struct page
*page
, unsigned int order
);
378 extern void __putback_isolated_page(struct page
*page
, unsigned int order
,
380 extern void memblock_free_pages(struct page
*page
, unsigned long pfn
,
382 extern void __free_pages_core(struct page
*page
, unsigned int order
);
385 * This will have no effect, other than possibly generating a warning, if the
386 * caller passes in a non-large folio.
388 static inline void folio_set_order(struct folio
*folio
, unsigned int order
)
390 if (WARN_ON_ONCE(!order
|| !folio_test_large(folio
)))
393 folio
->_folio_order
= order
;
395 folio
->_folio_nr_pages
= 1U << order
;
399 static inline void prep_compound_head(struct page
*page
, unsigned int order
)
401 struct folio
*folio
= (struct folio
*)page
;
403 folio_set_compound_dtor(folio
, COMPOUND_PAGE_DTOR
);
404 folio_set_order(folio
, order
);
405 atomic_set(&folio
->_entire_mapcount
, -1);
406 atomic_set(&folio
->_nr_pages_mapped
, 0);
407 atomic_set(&folio
->_pincount
, 0);
410 static inline void prep_compound_tail(struct page
*head
, int tail_idx
)
412 struct page
*p
= head
+ tail_idx
;
414 p
->mapping
= TAIL_MAPPING
;
415 set_compound_head(p
, head
);
416 set_page_private(p
, 0);
419 extern void prep_compound_page(struct page
*page
, unsigned int order
);
421 extern void post_alloc_hook(struct page
*page
, unsigned int order
,
423 extern int user_min_free_kbytes
;
425 extern void free_unref_page(struct page
*page
, unsigned int order
);
426 extern void free_unref_page_list(struct list_head
*list
);
428 extern void zone_pcp_reset(struct zone
*zone
);
429 extern void zone_pcp_disable(struct zone
*zone
);
430 extern void zone_pcp_enable(struct zone
*zone
);
431 extern void zone_pcp_init(struct zone
*zone
);
433 extern void *memmap_alloc(phys_addr_t size
, phys_addr_t align
,
434 phys_addr_t min_addr
,
435 int nid
, bool exact_nid
);
437 void memmap_init_range(unsigned long, int, unsigned long, unsigned long,
438 unsigned long, enum meminit_context
, struct vmem_altmap
*, int);
441 int split_free_page(struct page
*free_page
,
442 unsigned int order
, unsigned long split_pfn_offset
);
444 #if defined CONFIG_COMPACTION || defined CONFIG_CMA
450 * compact_control is used to track pages being migrated and the free pages
451 * they are being migrated to during memory compaction. The free_pfn starts
452 * at the end of a zone and migrate_pfn begins at the start. Movable pages
453 * are moved to the end of a zone during a compaction run and the run
454 * completes when free_pfn <= migrate_pfn
456 struct compact_control
{
457 struct list_head freepages
; /* List of free pages to migrate to */
458 struct list_head migratepages
; /* List of pages being migrated */
459 unsigned int nr_freepages
; /* Number of isolated free pages */
460 unsigned int nr_migratepages
; /* Number of pages to migrate */
461 unsigned long free_pfn
; /* isolate_freepages search base */
463 * Acts as an in/out parameter to page isolation for migration.
464 * isolate_migratepages uses it as a search base.
465 * isolate_migratepages_block will update the value to the next pfn
466 * after the last isolated one.
468 unsigned long migrate_pfn
;
469 unsigned long fast_start_pfn
; /* a pfn to start linear scan from */
471 unsigned long total_migrate_scanned
;
472 unsigned long total_free_scanned
;
473 unsigned short fast_search_fail
;/* failures to use free list searches */
474 short search_order
; /* order to start a fast search at */
475 const gfp_t gfp_mask
; /* gfp mask of a direct compactor */
476 int order
; /* order a direct compactor needs */
477 int migratetype
; /* migratetype of direct compactor */
478 const unsigned int alloc_flags
; /* alloc flags of a direct compactor */
479 const int highest_zoneidx
; /* zone index of a direct compactor */
480 enum migrate_mode mode
; /* Async or sync migration mode */
481 bool ignore_skip_hint
; /* Scan blocks even if marked skip */
482 bool no_set_skip_hint
; /* Don't mark blocks for skipping */
483 bool ignore_block_suitable
; /* Scan blocks considered unsuitable */
484 bool direct_compaction
; /* False from kcompactd or /proc/... */
485 bool proactive_compaction
; /* kcompactd proactive compaction */
486 bool whole_zone
; /* Whole zone should/has been scanned */
487 bool contended
; /* Signal lock contention */
488 bool finish_pageblock
; /* Scan the remainder of a pageblock. Used
489 * when there are potentially transient
490 * isolation or migration failures to
491 * ensure forward progress.
493 bool alloc_contig
; /* alloc_contig_range allocation */
497 * Used in direct compaction when a page should be taken from the freelists
498 * immediately when one is created during the free path.
500 struct capture_control
{
501 struct compact_control
*cc
;
506 isolate_freepages_range(struct compact_control
*cc
,
507 unsigned long start_pfn
, unsigned long end_pfn
);
509 isolate_migratepages_range(struct compact_control
*cc
,
510 unsigned long low_pfn
, unsigned long end_pfn
);
512 int __alloc_contig_migrate_range(struct compact_control
*cc
,
513 unsigned long start
, unsigned long end
);
515 /* Free whole pageblock and set its migration type to MIGRATE_CMA. */
516 void init_cma_reserved_pageblock(struct page
*page
);
518 #endif /* CONFIG_COMPACTION || CONFIG_CMA */
520 int find_suitable_fallback(struct free_area
*area
, unsigned int order
,
521 int migratetype
, bool only_stealable
, bool *can_steal
);
523 static inline bool free_area_empty(struct free_area
*area
, int migratetype
)
525 return list_empty(&area
->free_list
[migratetype
]);
529 * These three helpers classifies VMAs for virtual memory accounting.
533 * Executable code area - executable, not writable, not stack
535 static inline bool is_exec_mapping(vm_flags_t flags
)
537 return (flags
& (VM_EXEC
| VM_WRITE
| VM_STACK
)) == VM_EXEC
;
541 * Stack area - automatically grows in one direction
543 * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
544 * do_mmap() forbids all other combinations.
546 static inline bool is_stack_mapping(vm_flags_t flags
)
548 return (flags
& VM_STACK
) == VM_STACK
;
552 * Data area - private, writable, not stack
554 static inline bool is_data_mapping(vm_flags_t flags
)
556 return (flags
& (VM_WRITE
| VM_SHARED
| VM_STACK
)) == VM_WRITE
;
560 struct anon_vma
*folio_anon_vma(struct folio
*folio
);
563 void unmap_mapping_folio(struct folio
*folio
);
564 extern long populate_vma_page_range(struct vm_area_struct
*vma
,
565 unsigned long start
, unsigned long end
, int *locked
);
566 extern long faultin_vma_page_range(struct vm_area_struct
*vma
,
567 unsigned long start
, unsigned long end
,
568 bool write
, int *locked
);
569 extern bool mlock_future_ok(struct mm_struct
*mm
, unsigned long flags
,
570 unsigned long bytes
);
572 * mlock_vma_folio() and munlock_vma_folio():
573 * should be called with vma's mmap_lock held for read or write,
574 * under page table lock for the pte/pmd being added or removed.
576 * mlock is usually called at the end of page_add_*_rmap(), munlock at
577 * the end of page_remove_rmap(); but new anon folios are managed by
578 * folio_add_lru_vma() calling mlock_new_folio().
580 * @compound is used to include pmd mappings of THPs, but filter out
581 * pte mappings of THPs, which cannot be consistently counted: a pte
582 * mapping of the THP head cannot be distinguished by the page alone.
584 void mlock_folio(struct folio
*folio
);
585 static inline void mlock_vma_folio(struct folio
*folio
,
586 struct vm_area_struct
*vma
, bool compound
)
589 * The VM_SPECIAL check here serves two purposes.
590 * 1) VM_IO check prevents migration from double-counting during mlock.
591 * 2) Although mmap_region() and mlock_fixup() take care that VM_LOCKED
592 * is never left set on a VM_SPECIAL vma, there is an interval while
593 * file->f_op->mmap() is using vm_insert_page(s), when VM_LOCKED may
594 * still be set while VM_SPECIAL bits are added: so ignore it then.
596 if (unlikely((vma
->vm_flags
& (VM_LOCKED
|VM_SPECIAL
)) == VM_LOCKED
) &&
597 (compound
|| !folio_test_large(folio
)))
601 void munlock_folio(struct folio
*folio
);
602 static inline void munlock_vma_folio(struct folio
*folio
,
603 struct vm_area_struct
*vma
, bool compound
)
605 if (unlikely(vma
->vm_flags
& VM_LOCKED
) &&
606 (compound
|| !folio_test_large(folio
)))
607 munlock_folio(folio
);
610 void mlock_new_folio(struct folio
*folio
);
611 bool need_mlock_drain(int cpu
);
612 void mlock_drain_local(void);
613 void mlock_drain_remote(int cpu
);
615 extern pmd_t
maybe_pmd_mkwrite(pmd_t pmd
, struct vm_area_struct
*vma
);
618 * Return the start of user virtual address at the specific offset within
621 static inline unsigned long
622 vma_pgoff_address(pgoff_t pgoff
, unsigned long nr_pages
,
623 struct vm_area_struct
*vma
)
625 unsigned long address
;
627 if (pgoff
>= vma
->vm_pgoff
) {
628 address
= vma
->vm_start
+
629 ((pgoff
- vma
->vm_pgoff
) << PAGE_SHIFT
);
630 /* Check for address beyond vma (or wrapped through 0?) */
631 if (address
< vma
->vm_start
|| address
>= vma
->vm_end
)
633 } else if (pgoff
+ nr_pages
- 1 >= vma
->vm_pgoff
) {
634 /* Test above avoids possibility of wrap to 0 on 32-bit */
635 address
= vma
->vm_start
;
643 * Return the start of user virtual address of a page within a vma.
644 * Returns -EFAULT if all of the page is outside the range of vma.
645 * If page is a compound head, the entire compound page is considered.
647 static inline unsigned long
648 vma_address(struct page
*page
, struct vm_area_struct
*vma
)
650 VM_BUG_ON_PAGE(PageKsm(page
), page
); /* KSM page->index unusable */
651 return vma_pgoff_address(page_to_pgoff(page
), compound_nr(page
), vma
);
655 * Then at what user virtual address will none of the range be found in vma?
656 * Assumes that vma_address() already returned a good starting address.
658 static inline unsigned long vma_address_end(struct page_vma_mapped_walk
*pvmw
)
660 struct vm_area_struct
*vma
= pvmw
->vma
;
662 unsigned long address
;
664 /* Common case, plus ->pgoff is invalid for KSM */
665 if (pvmw
->nr_pages
== 1)
666 return pvmw
->address
+ PAGE_SIZE
;
668 pgoff
= pvmw
->pgoff
+ pvmw
->nr_pages
;
669 address
= vma
->vm_start
+ ((pgoff
- vma
->vm_pgoff
) << PAGE_SHIFT
);
670 /* Check for address beyond vma (or wrapped through 0?) */
671 if (address
< vma
->vm_start
|| address
> vma
->vm_end
)
672 address
= vma
->vm_end
;
676 static inline struct file
*maybe_unlock_mmap_for_io(struct vm_fault
*vmf
,
679 int flags
= vmf
->flags
;
685 * FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or
686 * anything, so we only pin the file and drop the mmap_lock if only
687 * FAULT_FLAG_ALLOW_RETRY is set, while this is the first attempt.
689 if (fault_flag_allow_retry_first(flags
) &&
690 !(flags
& FAULT_FLAG_RETRY_NOWAIT
)) {
691 fpin
= get_file(vmf
->vma
->vm_file
);
692 mmap_read_unlock(vmf
->vma
->vm_mm
);
696 #else /* !CONFIG_MMU */
697 static inline void unmap_mapping_folio(struct folio
*folio
) { }
698 static inline void mlock_new_folio(struct folio
*folio
) { }
699 static inline bool need_mlock_drain(int cpu
) { return false; }
700 static inline void mlock_drain_local(void) { }
701 static inline void mlock_drain_remote(int cpu
) { }
702 static inline void vunmap_range_noflush(unsigned long start
, unsigned long end
)
705 #endif /* !CONFIG_MMU */
707 /* Memory initialisation debug and verification */
708 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
709 DECLARE_STATIC_KEY_TRUE(deferred_pages
);
711 bool __init
deferred_grow_zone(struct zone
*zone
, unsigned int order
);
712 #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
720 #ifdef CONFIG_DEBUG_MEMORY_INIT
722 extern int mminit_loglevel
;
724 #define mminit_dprintk(level, prefix, fmt, arg...) \
726 if (level < mminit_loglevel) { \
727 if (level <= MMINIT_WARNING) \
728 pr_warn("mminit::" prefix " " fmt, ##arg); \
730 printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
734 extern void mminit_verify_pageflags_layout(void);
735 extern void mminit_verify_zonelist(void);
738 static inline void mminit_dprintk(enum mminit_level level
,
739 const char *prefix
, const char *fmt
, ...)
743 static inline void mminit_verify_pageflags_layout(void)
747 static inline void mminit_verify_zonelist(void)
750 #endif /* CONFIG_DEBUG_MEMORY_INIT */
752 #define NODE_RECLAIM_NOSCAN -2
753 #define NODE_RECLAIM_FULL -1
754 #define NODE_RECLAIM_SOME 0
755 #define NODE_RECLAIM_SUCCESS 1
758 extern int node_reclaim(struct pglist_data
*, gfp_t
, unsigned int);
759 extern int find_next_best_node(int node
, nodemask_t
*used_node_mask
);
761 static inline int node_reclaim(struct pglist_data
*pgdat
, gfp_t mask
,
764 return NODE_RECLAIM_NOSCAN
;
766 static inline int find_next_best_node(int node
, nodemask_t
*used_node_mask
)
773 * mm/memory-failure.c
775 extern int hwpoison_filter(struct page
*p
);
777 extern u32 hwpoison_filter_dev_major
;
778 extern u32 hwpoison_filter_dev_minor
;
779 extern u64 hwpoison_filter_flags_mask
;
780 extern u64 hwpoison_filter_flags_value
;
781 extern u64 hwpoison_filter_memcg
;
782 extern u32 hwpoison_filter_enable
;
784 extern unsigned long __must_check
vm_mmap_pgoff(struct file
*, unsigned long,
785 unsigned long, unsigned long,
786 unsigned long, unsigned long);
788 extern void set_pageblock_order(void);
789 unsigned long reclaim_pages(struct list_head
*folio_list
);
790 unsigned int reclaim_clean_pages_from_list(struct zone
*zone
,
791 struct list_head
*folio_list
);
792 /* The ALLOC_WMARK bits are used as an index to zone->watermark */
793 #define ALLOC_WMARK_MIN WMARK_MIN
794 #define ALLOC_WMARK_LOW WMARK_LOW
795 #define ALLOC_WMARK_HIGH WMARK_HIGH
796 #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
798 /* Mask to get the watermark bits */
799 #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
802 * Only MMU archs have async oom victim reclaim - aka oom_reaper so we
803 * cannot assume a reduced access to memory reserves is sufficient for
807 #define ALLOC_OOM 0x08
809 #define ALLOC_OOM ALLOC_NO_WATERMARKS
812 #define ALLOC_NON_BLOCK 0x10 /* Caller cannot block. Allow access
813 * to 25% of the min watermark or
814 * 62.5% if __GFP_HIGH is set.
816 #define ALLOC_MIN_RESERVE 0x20 /* __GFP_HIGH set. Allow access to 50%
817 * of the min watermark.
819 #define ALLOC_CPUSET 0x40 /* check for correct cpuset */
820 #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
821 #ifdef CONFIG_ZONE_DMA32
822 #define ALLOC_NOFRAGMENT 0x100 /* avoid mixing pageblock types */
824 #define ALLOC_NOFRAGMENT 0x0
826 #define ALLOC_HIGHATOMIC 0x200 /* Allows access to MIGRATE_HIGHATOMIC */
827 #define ALLOC_KSWAPD 0x800 /* allow waking of kswapd, __GFP_KSWAPD_RECLAIM set */
829 /* Flags that allow allocations below the min watermark. */
830 #define ALLOC_RESERVES (ALLOC_NON_BLOCK|ALLOC_MIN_RESERVE|ALLOC_HIGHATOMIC|ALLOC_OOM)
833 struct tlbflush_unmap_batch
;
837 * only for MM internal work items which do not depend on
838 * any allocations or locks which might depend on allocations
840 extern struct workqueue_struct
*mm_percpu_wq
;
842 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
843 void try_to_unmap_flush(void);
844 void try_to_unmap_flush_dirty(void);
845 void flush_tlb_batched_pending(struct mm_struct
*mm
);
847 static inline void try_to_unmap_flush(void)
850 static inline void try_to_unmap_flush_dirty(void)
853 static inline void flush_tlb_batched_pending(struct mm_struct
*mm
)
856 #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
858 extern const struct trace_print_flags pageflag_names
[];
859 extern const struct trace_print_flags pagetype_names
[];
860 extern const struct trace_print_flags vmaflag_names
[];
861 extern const struct trace_print_flags gfpflag_names
[];
863 static inline bool is_migrate_highatomic(enum migratetype migratetype
)
865 return migratetype
== MIGRATE_HIGHATOMIC
;
868 static inline bool is_migrate_highatomic_page(struct page
*page
)
870 return get_pageblock_migratetype(page
) == MIGRATE_HIGHATOMIC
;
873 void setup_zone_pageset(struct zone
*zone
);
875 struct migration_target_control
{
876 int nid
; /* preferred node id */
884 size_t splice_folio_into_pipe(struct pipe_inode_info
*pipe
,
885 struct folio
*folio
, loff_t fpos
, size_t size
);
891 void __init
vmalloc_init(void);
892 int __must_check
vmap_pages_range_noflush(unsigned long addr
, unsigned long end
,
893 pgprot_t prot
, struct page
**pages
, unsigned int page_shift
);
895 static inline void vmalloc_init(void)
900 int __must_check
vmap_pages_range_noflush(unsigned long addr
, unsigned long end
,
901 pgprot_t prot
, struct page
**pages
, unsigned int page_shift
)
907 int __must_check
__vmap_pages_range_noflush(unsigned long addr
,
908 unsigned long end
, pgprot_t prot
,
909 struct page
**pages
, unsigned int page_shift
);
911 void vunmap_range_noflush(unsigned long start
, unsigned long end
);
913 void __vunmap_range_noflush(unsigned long start
, unsigned long end
);
915 int numa_migrate_prep(struct page
*page
, struct vm_area_struct
*vma
,
916 unsigned long addr
, int page_nid
, int *flags
);
918 void free_zone_device_page(struct page
*page
);
919 int migrate_device_coherent_page(struct page
*page
);
924 struct folio
*try_grab_folio(struct page
*page
, int refs
, unsigned int flags
);
925 int __must_check
try_grab_page(struct page
*page
, unsigned int flags
);
928 /* mark page accessed */
929 FOLL_TOUCH
= 1 << 16,
930 /* a retry, previous pass started an IO */
931 FOLL_TRIED
= 1 << 17,
932 /* we are working on non-current tsk/mm */
933 FOLL_REMOTE
= 1 << 18,
934 /* pages must be released via unpin_user_page */
936 /* gup_fast: prevent fall-back to slow gup */
937 FOLL_FAST_ONLY
= 1 << 20,
938 /* allow unlocking the mmap lock */
939 FOLL_UNLOCKABLE
= 1 << 21,
943 * Indicates for which pages that are write-protected in the page table,
944 * whether GUP has to trigger unsharing via FAULT_FLAG_UNSHARE such that the
945 * GUP pin will remain consistent with the pages mapped into the page tables
948 * Temporary unmapping of PageAnonExclusive() pages or clearing of
949 * PageAnonExclusive() has to protect against concurrent GUP:
950 * * Ordinary GUP: Using the PT lock
951 * * GUP-fast and fork(): mm->write_protect_seq
952 * * GUP-fast and KSM or temporary unmapping (swap, migration): see
953 * page_try_share_anon_rmap()
955 * Must be called with the (sub)page that's actually referenced via the
956 * page table entry, which might not necessarily be the head page for a
959 * If the vma is NULL, we're coming from the GUP-fast path and might have
960 * to fallback to the slow path just to lookup the vma.
962 static inline bool gup_must_unshare(struct vm_area_struct
*vma
,
963 unsigned int flags
, struct page
*page
)
966 * FOLL_WRITE is implicitly handled correctly as the page table entry
967 * has to be writable -- and if it references (part of) an anonymous
968 * folio, that part is required to be marked exclusive.
970 if ((flags
& (FOLL_WRITE
| FOLL_PIN
)) != FOLL_PIN
)
973 * Note: PageAnon(page) is stable until the page is actually getting
976 if (!PageAnon(page
)) {
978 * We only care about R/O long-term pining: R/O short-term
979 * pinning does not have the semantics to observe successive
980 * changes through the process page tables.
982 if (!(flags
& FOLL_LONGTERM
))
985 /* We really need the vma ... */
990 * ... because we only care about writable private ("COW")
991 * mappings where we have to break COW early.
993 return is_cow_mapping(vma
->vm_flags
);
996 /* Paired with a memory barrier in page_try_share_anon_rmap(). */
997 if (IS_ENABLED(CONFIG_HAVE_FAST_GUP
))
1001 * Note that PageKsm() pages cannot be exclusive, and consequently,
1002 * cannot get pinned.
1004 return !PageAnonExclusive(page
);
1007 extern bool mirrored_kernelcore
;
1009 static inline bool vma_soft_dirty_enabled(struct vm_area_struct
*vma
)
1012 * NOTE: we must check this before VM_SOFTDIRTY on soft-dirty
1013 * enablements, because when without soft-dirty being compiled in,
1014 * VM_SOFTDIRTY is defined as 0x0, then !(vm_flags & VM_SOFTDIRTY)
1015 * will be constantly true.
1017 if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY
))
1021 * Soft-dirty is kind of special: its tracking is enabled when the
1022 * vma flags not set.
1024 return !(vma
->vm_flags
& VM_SOFTDIRTY
);
1028 * VMA Iterator functions shared between nommu and mmap
1030 static inline int vma_iter_prealloc(struct vma_iterator
*vmi
)
1032 return mas_preallocate(&vmi
->mas
, GFP_KERNEL
);
1035 static inline void vma_iter_clear(struct vma_iterator
*vmi
,
1036 unsigned long start
, unsigned long end
)
1038 mas_set_range(&vmi
->mas
, start
, end
- 1);
1039 mas_store_prealloc(&vmi
->mas
, NULL
);
1042 static inline struct vm_area_struct
*vma_iter_load(struct vma_iterator
*vmi
)
1044 return mas_walk(&vmi
->mas
);
1047 /* Store a VMA with preallocated memory */
1048 static inline void vma_iter_store(struct vma_iterator
*vmi
,
1049 struct vm_area_struct
*vma
)
1052 #if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
1053 if (MAS_WARN_ON(&vmi
->mas
, vmi
->mas
.node
!= MAS_START
&&
1054 vmi
->mas
.index
> vma
->vm_start
)) {
1055 pr_warn("%lx > %lx\n store vma %lx-%lx\n into slot %lx-%lx\n",
1056 vmi
->mas
.index
, vma
->vm_start
, vma
->vm_start
,
1057 vma
->vm_end
, vmi
->mas
.index
, vmi
->mas
.last
);
1059 if (MAS_WARN_ON(&vmi
->mas
, vmi
->mas
.node
!= MAS_START
&&
1060 vmi
->mas
.last
< vma
->vm_start
)) {
1061 pr_warn("%lx < %lx\nstore vma %lx-%lx\ninto slot %lx-%lx\n",
1062 vmi
->mas
.last
, vma
->vm_start
, vma
->vm_start
, vma
->vm_end
,
1063 vmi
->mas
.index
, vmi
->mas
.last
);
1067 if (vmi
->mas
.node
!= MAS_START
&&
1068 ((vmi
->mas
.index
> vma
->vm_start
) || (vmi
->mas
.last
< vma
->vm_start
)))
1069 vma_iter_invalidate(vmi
);
1071 vmi
->mas
.index
= vma
->vm_start
;
1072 vmi
->mas
.last
= vma
->vm_end
- 1;
1073 mas_store_prealloc(&vmi
->mas
, vma
);
1076 static inline int vma_iter_store_gfp(struct vma_iterator
*vmi
,
1077 struct vm_area_struct
*vma
, gfp_t gfp
)
1079 if (vmi
->mas
.node
!= MAS_START
&&
1080 ((vmi
->mas
.index
> vma
->vm_start
) || (vmi
->mas
.last
< vma
->vm_start
)))
1081 vma_iter_invalidate(vmi
);
1083 vmi
->mas
.index
= vma
->vm_start
;
1084 vmi
->mas
.last
= vma
->vm_end
- 1;
1085 mas_store_gfp(&vmi
->mas
, vma
, gfp
);
1086 if (unlikely(mas_is_err(&vmi
->mas
)))
1093 * VMA lock generalization
1095 struct vma_prepare
{
1096 struct vm_area_struct
*vma
;
1097 struct vm_area_struct
*adj_next
;
1099 struct address_space
*mapping
;
1100 struct anon_vma
*anon_vma
;
1101 struct vm_area_struct
*insert
;
1102 struct vm_area_struct
*remove
;
1103 struct vm_area_struct
*remove2
;
1105 #endif /* __MM_INTERNAL_H */