mm/internal.h

   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 static inline bool can_madv_lru_vma(struct vm_area_struct *vma)
  43 {
  44         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 void do_page_cache_ra(struct readahead_control *, unsigned long nr_to_read,
  53                 unsigned long lookahead_size);
  54 void force_page_cache_ra(struct readahead_control *, unsigned long nr);
  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 {
  58         DEFINE_READAHEAD(ractl, file, &file->f_ra, mapping, index);
  59         force_page_cache_ra(&ractl, nr_to_read);
  60 }
  61
  62 unsigned find_lock_entries(struct address_space *mapping, pgoff_t start,
  63                 pgoff_t end, struct pagevec *pvec, pgoff_t *indices);
  64
  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
  88 /*
  89  * Turn a non-refcounted page (->_refcount == 0) into refcounted with
  90  * a count of one.
  91  */
  92 static inline void set_page_refcounted(struct page *page)
  93 {
  94         VM_BUG_ON_PAGE(PageTail(page), page);
  95         VM_BUG_ON_PAGE(page_ref_count(page), page);
  96         set_page_count(page, 1);
  97 }
  98
  99 extern unsigned long highest_memmap_pfn;
 100
 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
 107 /*
 108  * in mm/vmscan.c:
 109  */
 110 extern int isolate_lru_page(struct page *page);
 111 extern void putback_lru_page(struct page *page);
 112
 113 /*
 114  * in mm/rmap.c:
 115  */
 116 extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
 117
 118 /*
 119  * in mm/page_alloc.c
 120  */
 121
 122 /*
 123  * Structure for holding the mostly immutable allocation parameters passed
 124  * between functions involved in allocations, including the alloc_pages*
 125  * family of functions.
 126  *
 127  * nodemask, migratetype and highest_zoneidx are initialized only once in
 128  * __alloc_pages() and then never change.
 129  *
 130  * zonelist, preferred_zone and highest_zoneidx are set first in
 131  * __alloc_pages() for the fast path, and might be later changed
 132  * in __alloc_pages_slowpath(). All other functions pass the whole structure
 133  * by a const pointer.
 134  */
 135 struct alloc_context {
 136         struct zonelist *zonelist;
 137         nodemask_t *nodemask;
 138         struct zoneref *preferred_zoneref;
 139         int migratetype;
 140
 141         /*
 142          * highest_zoneidx represents highest usable zone index of
 143          * the allocation request. Due to the nature of the zone,
 144          * memory on lower zone than the highest_zoneidx will be
 145          * protected by lowmem_reserve[highest_zoneidx].
 146          *
 147          * highest_zoneidx is also used by reclaim/compaction to limit
 148          * the target zone since higher zone than this index cannot be
 149          * usable for this allocation request.
 150          */
 151         enum zone_type highest_zoneidx;
 152         bool spread_dirty_pages;
 153 };
 154
 155 /*
 156  * Locate the struct page for both the matching buddy in our
 157  * pair (buddy1) and the combined O(n+1) page they form (page).
 158  *
 159  * 1) Any buddy B1 will have an order O twin B2 which satisfies
 160  * the following equation:
 161  *     B2 = B1 ^ (1 << O)
 162  * For example, if the starting buddy (buddy2) is #8 its order
 163  * 1 buddy is #10:
 164  *     B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10
 165  *
 166  * 2) Any buddy B will have an order O+1 parent P which
 167  * satisfies the following equation:
 168  *     P = B & ~(1 << O)
 169  *
 170  * Assumption: *_mem_map is contiguous at least up to MAX_ORDER
 171  */
 172 static inline unsigned long
 173 __find_buddy_pfn(unsigned long page_pfn, unsigned int order)
 174 {
 175         return page_pfn ^ (1 << order);
 176 }
 177
 178 extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
 179                                 unsigned long end_pfn, struct zone *zone);
 180
 181 static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn,
 182                                 unsigned long end_pfn, struct zone *zone)
 183 {
 184         if (zone->contiguous)
 185                 return pfn_to_page(start_pfn);
 186
 187         return __pageblock_pfn_to_page(start_pfn, end_pfn, zone);
 188 }
 189
 190 extern int __isolate_free_page(struct page *page, unsigned int order);
 191 extern void __putback_isolated_page(struct page *page, unsigned int order,
 192                                     int mt);
 193 extern void memblock_free_pages(struct page *page, unsigned long pfn,
 194                                         unsigned int order);
 195 extern void __free_pages_core(struct page *page, unsigned int order);
 196 extern void prep_compound_page(struct page *page, unsigned int order);
 197 extern void post_alloc_hook(struct page *page, unsigned int order,
 198                                         gfp_t gfp_flags);
 199 extern int user_min_free_kbytes;
 200
 201 extern void free_unref_page(struct page *page);
 202 extern void free_unref_page_list(struct list_head *list);
 203
 204 extern void zone_pcp_update(struct zone *zone);
 205 extern void zone_pcp_reset(struct zone *zone);
 206 extern void zone_pcp_disable(struct zone *zone);
 207 extern void zone_pcp_enable(struct zone *zone);
 208
 209 #if defined CONFIG_COMPACTION || defined CONFIG_CMA
 210
 211 /*
 212  * in mm/compaction.c
 213  */
 214 /*
 215  * compact_control is used to track pages being migrated and the free pages
 216  * they are being migrated to during memory compaction. The free_pfn starts
 217  * at the end of a zone and migrate_pfn begins at the start. Movable pages
 218  * are moved to the end of a zone during a compaction run and the run
 219  * completes when free_pfn <= migrate_pfn
 220  */
 221 struct compact_control {
 222         struct list_head freepages;     /* List of free pages to migrate to */
 223         struct list_head migratepages;  /* List of pages being migrated */
 224         unsigned int nr_freepages;      /* Number of isolated free pages */
 225         unsigned int nr_migratepages;   /* Number of pages to migrate */
 226         unsigned long free_pfn;         /* isolate_freepages search base */
 227         /*
 228          * Acts as an in/out parameter to page isolation for migration.
 229          * isolate_migratepages uses it as a search base.
 230          * isolate_migratepages_block will update the value to the next pfn
 231          * after the last isolated one.
 232          */
 233         unsigned long migrate_pfn;
 234         unsigned long fast_start_pfn;   /* a pfn to start linear scan from */
 235         struct zone *zone;
 236         unsigned long total_migrate_scanned;
 237         unsigned long total_free_scanned;
 238         unsigned short fast_search_fail;/* failures to use free list searches */
 239         short search_order;             /* order to start a fast search at */
 240         const gfp_t gfp_mask;           /* gfp mask of a direct compactor */
 241         int order;                      /* order a direct compactor needs */
 242         int migratetype;                /* migratetype of direct compactor */
 243         const unsigned int alloc_flags; /* alloc flags of a direct compactor */
 244         const int highest_zoneidx;      /* zone index of a direct compactor */
 245         enum migrate_mode mode;         /* Async or sync migration mode */
 246         bool ignore_skip_hint;          /* Scan blocks even if marked skip */
 247         bool no_set_skip_hint;          /* Don't mark blocks for skipping */
 248         bool ignore_block_suitable;     /* Scan blocks considered unsuitable */
 249         bool direct_compaction;         /* False from kcompactd or /proc/... */
 250         bool proactive_compaction;      /* kcompactd proactive compaction */
 251         bool whole_zone;                /* Whole zone should/has been scanned */
 252         bool contended;                 /* Signal lock or sched contention */
 253         bool rescan;                    /* Rescanning the same pageblock */
 254         bool alloc_contig;              /* alloc_contig_range allocation */
 255 };
 256
 257 /*
 258  * Used in direct compaction when a page should be taken from the freelists
 259  * immediately when one is created during the free path.
 260  */
 261 struct capture_control {
 262         struct compact_control *cc;
 263         struct page *page;
 264 };
 265
 266 unsigned long
 267 isolate_freepages_range(struct compact_control *cc,
 268                         unsigned long start_pfn, unsigned long end_pfn);
 269 int
 270 isolate_migratepages_range(struct compact_control *cc,
 271                            unsigned long low_pfn, unsigned long end_pfn);
 272 int find_suitable_fallback(struct free_area *area, unsigned int order,
 273                         int migratetype, bool only_stealable, bool *can_steal);
 274
 275 #endif
 276
 277 /*
 278  * This function returns the order of a free page in the buddy system. In
 279  * general, page_zone(page)->lock must be held by the caller to prevent the
 280  * page from being allocated in parallel and returning garbage as the order.
 281  * If a caller does not hold page_zone(page)->lock, it must guarantee that the
 282  * page cannot be allocated or merged in parallel. Alternatively, it must
 283  * handle invalid values gracefully, and use buddy_order_unsafe() below.
 284  */
 285 static inline unsigned int buddy_order(struct page *page)
 286 {
 287         /* PageBuddy() must be checked by the caller */
 288         return page_private(page);
 289 }
 290
 291 /*
 292  * Like buddy_order(), but for callers who cannot afford to hold the zone lock.
 293  * PageBuddy() should be checked first by the caller to minimize race window,
 294  * and invalid values must be handled gracefully.
 295  *
 296  * READ_ONCE is used so that if the caller assigns the result into a local
 297  * variable and e.g. tests it for valid range before using, the compiler cannot
 298  * decide to remove the variable and inline the page_private(page) multiple
 299  * times, potentially observing different values in the tests and the actual
 300  * use of the result.
 301  */
 302 #define buddy_order_unsafe(page)        READ_ONCE(page_private(page))
 303
 304 /*
 305  * These three helpers classifies VMAs for virtual memory accounting.
 306  */
 307
 308 /*
 309  * Executable code area - executable, not writable, not stack
 310  */
 311 static inline bool is_exec_mapping(vm_flags_t flags)
 312 {
 313         return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC;
 314 }
 315
 316 /*
 317  * Stack area - automatically grows in one direction
 318  *
 319  * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
 320  * do_mmap() forbids all other combinations.
 321  */
 322 static inline bool is_stack_mapping(vm_flags_t flags)
 323 {
 324         return (flags & VM_STACK) == VM_STACK;
 325 }
 326
 327 /*
 328  * Data area - private, writable, not stack
 329  */
 330 static inline bool is_data_mapping(vm_flags_t flags)
 331 {
 332         return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE;
 333 }
 334
 335 /* mm/util.c */
 336 void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
 337                 struct vm_area_struct *prev);
 338 void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma);
 339
 340 #ifdef CONFIG_MMU
 341 extern long populate_vma_page_range(struct vm_area_struct *vma,
 342                 unsigned long start, unsigned long end, int *nonblocking);
 343 extern void munlock_vma_pages_range(struct vm_area_struct *vma,
 344                         unsigned long start, unsigned long end);
 345 static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
 346 {
 347         munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
 348 }
 349
 350 /*
 351  * must be called with vma's mmap_lock held for read or write, and page locked.
 352  */
 353 extern void mlock_vma_page(struct page *page);
 354 extern unsigned int munlock_vma_page(struct page *page);
 355
 356 /*
 357  * Clear the page's PageMlocked().  This can be useful in a situation where
 358  * we want to unconditionally remove a page from the pagecache -- e.g.,
 359  * on truncation or freeing.
 360  *
 361  * It is legal to call this function for any page, mlocked or not.
 362  * If called for a page that is still mapped by mlocked vmas, all we do
 363  * is revert to lazy LRU behaviour -- semantics are not broken.
 364  */
 365 extern void clear_page_mlock(struct page *page);
 366
 367 /*
 368  * mlock_migrate_page - called only from migrate_misplaced_transhuge_page()
 369  * (because that does not go through the full procedure of migration ptes):
 370  * to migrate the Mlocked page flag; update statistics.
 371  */
 372 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
 373 {
 374         if (TestClearPageMlocked(page)) {
 375                 int nr_pages = thp_nr_pages(page);
 376
 377                 /* Holding pmd lock, no change in irq context: __mod is safe */
 378                 __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
 379                 SetPageMlocked(newpage);
 380                 __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
 381         }
 382 }
 383
 384 extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
 385
 386 /*
 387  * At what user virtual address is page expected in @vma?
 388  */
 389 static inline unsigned long
 390 __vma_address(struct page *page, struct vm_area_struct *vma)
 391 {
 392         pgoff_t pgoff = page_to_pgoff(page);
 393         return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
 394 }
 395
 396 static inline unsigned long
 397 vma_address(struct page *page, struct vm_area_struct *vma)
 398 {
 399         unsigned long start, end;
 400
 401         start = __vma_address(page, vma);
 402         end = start + thp_size(page) - PAGE_SIZE;
 403
 404         /* page should be within @vma mapping range */
 405         VM_BUG_ON_VMA(end < vma->vm_start || start >= vma->vm_end, vma);
 406
 407         return max(start, vma->vm_start);
 408 }
 409
 410 static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
 411                                                     struct file *fpin)
 412 {
 413         int flags = vmf->flags;
 414
 415         if (fpin)
 416                 return fpin;
 417
 418         /*
 419          * FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or
 420          * anything, so we only pin the file and drop the mmap_lock if only
 421          * FAULT_FLAG_ALLOW_RETRY is set, while this is the first attempt.
 422          */
 423         if (fault_flag_allow_retry_first(flags) &&
 424             !(flags & FAULT_FLAG_RETRY_NOWAIT)) {
 425                 fpin = get_file(vmf->vma->vm_file);
 426                 mmap_read_unlock(vmf->vma->vm_mm);
 427         }
 428         return fpin;
 429 }
 430
 431 #else /* !CONFIG_MMU */
 432 static inline void clear_page_mlock(struct page *page) { }
 433 static inline void mlock_vma_page(struct page *page) { }
 434 static inline void mlock_migrate_page(struct page *new, struct page *old) { }
 435 static inline void vunmap_range_noflush(unsigned long start, unsigned long end)
 436 {
 437 }
 438 #endif /* !CONFIG_MMU */
 439
 440 /*
 441  * Return the mem_map entry representing the 'offset' subpage within
 442  * the maximally aligned gigantic page 'base'.  Handle any discontiguity
 443  * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
 444  */
 445 static inline struct page *mem_map_offset(struct page *base, int offset)
 446 {
 447         if (unlikely(offset >= MAX_ORDER_NR_PAGES))
 448                 return nth_page(base, offset);
 449         return base + offset;
 450 }
 451
 452 /*
 453  * Iterator over all subpages within the maximally aligned gigantic
 454  * page 'base'.  Handle any discontiguity in the mem_map.
 455  */
 456 static inline struct page *mem_map_next(struct page *iter,
 457                                                 struct page *base, int offset)
 458 {
 459         if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
 460                 unsigned long pfn = page_to_pfn(base) + offset;
 461                 if (!pfn_valid(pfn))
 462                         return NULL;
 463                 return pfn_to_page(pfn);
 464         }
 465         return iter + 1;
 466 }
 467
 468 /* Memory initialisation debug and verification */
 469 enum mminit_level {
 470         MMINIT_WARNING,
 471         MMINIT_VERIFY,
 472         MMINIT_TRACE
 473 };
 474
 475 #ifdef CONFIG_DEBUG_MEMORY_INIT
 476
 477 extern int mminit_loglevel;
 478
 479 #define mminit_dprintk(level, prefix, fmt, arg...) \
 480 do { \
 481         if (level < mminit_loglevel) { \
 482                 if (level <= MMINIT_WARNING) \
 483                         pr_warn("mminit::" prefix " " fmt, ##arg);      \
 484                 else \
 485                         printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
 486         } \
 487 } while (0)
 488
 489 extern void mminit_verify_pageflags_layout(void);
 490 extern void mminit_verify_zonelist(void);
 491 #else
 492
 493 static inline void mminit_dprintk(enum mminit_level level,
 494                                 const char *prefix, const char *fmt, ...)
 495 {
 496 }
 497
 498 static inline void mminit_verify_pageflags_layout(void)
 499 {
 500 }
 501
 502 static inline void mminit_verify_zonelist(void)
 503 {
 504 }
 505 #endif /* CONFIG_DEBUG_MEMORY_INIT */
 506
 507 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
 508 #if defined(CONFIG_SPARSEMEM)
 509 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 510                                 unsigned long *end_pfn);
 511 #else
 512 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 513                                 unsigned long *end_pfn)
 514 {
 515 }
 516 #endif /* CONFIG_SPARSEMEM */
 517
 518 #define NODE_RECLAIM_NOSCAN     -2
 519 #define NODE_RECLAIM_FULL       -1
 520 #define NODE_RECLAIM_SOME       0
 521 #define NODE_RECLAIM_SUCCESS    1
 522
 523 #ifdef CONFIG_NUMA
 524 extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int);
 525 #else
 526 static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask,
 527                                 unsigned int order)
 528 {
 529         return NODE_RECLAIM_NOSCAN;
 530 }
 531 #endif
 532
 533 extern int hwpoison_filter(struct page *p);
 534
 535 extern u32 hwpoison_filter_dev_major;
 536 extern u32 hwpoison_filter_dev_minor;
 537 extern u64 hwpoison_filter_flags_mask;
 538 extern u64 hwpoison_filter_flags_value;
 539 extern u64 hwpoison_filter_memcg;
 540 extern u32 hwpoison_filter_enable;
 541
 542 extern unsigned long  __must_check vm_mmap_pgoff(struct file *, unsigned long,
 543         unsigned long, unsigned long,
 544         unsigned long, unsigned long);
 545
 546 extern void set_pageblock_order(void);
 547 unsigned int reclaim_clean_pages_from_list(struct zone *zone,
 548                                             struct list_head *page_list);
 549 /* The ALLOC_WMARK bits are used as an index to zone->watermark */
 550 #define ALLOC_WMARK_MIN         WMARK_MIN
 551 #define ALLOC_WMARK_LOW         WMARK_LOW
 552 #define ALLOC_WMARK_HIGH        WMARK_HIGH
 553 #define ALLOC_NO_WATERMARKS     0x04 /* don't check watermarks at all */
 554
 555 /* Mask to get the watermark bits */
 556 #define ALLOC_WMARK_MASK        (ALLOC_NO_WATERMARKS-1)
 557
 558 /*
 559  * Only MMU archs have async oom victim reclaim - aka oom_reaper so we
 560  * cannot assume a reduced access to memory reserves is sufficient for
 561  * !MMU
 562  */
 563 #ifdef CONFIG_MMU
 564 #define ALLOC_OOM               0x08
 565 #else
 566 #define ALLOC_OOM               ALLOC_NO_WATERMARKS
 567 #endif
 568
 569 #define ALLOC_HARDER             0x10 /* try to alloc harder */
 570 #define ALLOC_HIGH               0x20 /* __GFP_HIGH set */
 571 #define ALLOC_CPUSET             0x40 /* check for correct cpuset */
 572 #define ALLOC_CMA                0x80 /* allow allocations from CMA areas */
 573 #ifdef CONFIG_ZONE_DMA32
 574 #define ALLOC_NOFRAGMENT        0x100 /* avoid mixing pageblock types */
 575 #else
 576 #define ALLOC_NOFRAGMENT          0x0
 577 #endif
 578 #define ALLOC_KSWAPD            0x800 /* allow waking of kswapd, __GFP_KSWAPD_RECLAIM set */
 579
 580 enum ttu_flags;
 581 struct tlbflush_unmap_batch;
 582
 583
 584 /*
 585  * only for MM internal work items which do not depend on
 586  * any allocations or locks which might depend on allocations
 587  */
 588 extern struct workqueue_struct *mm_percpu_wq;
 589
 590 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
 591 void try_to_unmap_flush(void);
 592 void try_to_unmap_flush_dirty(void);
 593 void flush_tlb_batched_pending(struct mm_struct *mm);
 594 #else
 595 static inline void try_to_unmap_flush(void)
 596 {
 597 }
 598 static inline void try_to_unmap_flush_dirty(void)
 599 {
 600 }
 601 static inline void flush_tlb_batched_pending(struct mm_struct *mm)
 602 {
 603 }
 604 #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
 605
 606 extern const struct trace_print_flags pageflag_names[];
 607 extern const struct trace_print_flags vmaflag_names[];
 608 extern const struct trace_print_flags gfpflag_names[];
 609
 610 static inline bool is_migrate_highatomic(enum migratetype migratetype)
 611 {
 612         return migratetype == MIGRATE_HIGHATOMIC;
 613 }
 614
 615 static inline bool is_migrate_highatomic_page(struct page *page)
 616 {
 617         return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC;
 618 }
 619
 620 void setup_zone_pageset(struct zone *zone);
 621
 622 struct migration_target_control {
 623         int nid;                /* preferred node id */
 624         nodemask_t *nmask;
 625         gfp_t gfp_mask;
 626 };
 627
 628 /*
 629  * mm/vmalloc.c
 630  */
 631 #ifdef CONFIG_MMU
 632 int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
 633                 pgprot_t prot, struct page **pages, unsigned int page_shift);
 634 #else
 635 static inline
 636 int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
 637                 pgprot_t prot, struct page **pages, unsigned int page_shift)
 638 {
 639         return -EINVAL;
 640 }
 641 #endif
 642
 643 void vunmap_range_noflush(unsigned long start, unsigned long end);
 644
 645 #endif  /* __MM_INTERNAL_H */