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 force_page_cache_readahead(struct address_space *, struct file *,
  53                 pgoff_t index, unsigned long nr_to_read);
  54 void __do_page_cache_readahead(struct address_space *, struct file *,
  55                 pgoff_t index, unsigned long nr_to_read,
  56                 unsigned long lookahead_size);
  57
  58 /*
  59  * Submit IO for the read-ahead request in file_ra_state.
  60  */
  61 static inline void ra_submit(struct file_ra_state *ra,
  62                 struct address_space *mapping, struct file *filp)
  63 {
  64         __do_page_cache_readahead(mapping, filp,
  65                         ra->start, ra->size, ra->async_size);
  66 }
  67
  68 /**
  69  * page_evictable - test whether a page is evictable
  70  * @page: the page to test
  71  *
  72  * Test whether page is evictable--i.e., should be placed on active/inactive
  73  * lists vs unevictable list.
  74  *
  75  * Reasons page might not be evictable:
  76  * (1) page's mapping marked unevictable
  77  * (2) page is part of an mlocked VMA
  78  *
  79  */
  80 static inline bool page_evictable(struct page *page)
  81 {
  82         bool ret;
  83
  84         /* Prevent address_space of inode and swap cache from being freed */
  85         rcu_read_lock();
  86         ret = !mapping_unevictable(page_mapping(page)) && !PageMlocked(page);
  87         rcu_read_unlock();
  88         return ret;
  89 }
  90
  91 /*
  92  * Turn a non-refcounted page (->_refcount == 0) into refcounted with
  93  * a count of one.
  94  */
  95 static inline void set_page_refcounted(struct page *page)
  96 {
  97         VM_BUG_ON_PAGE(PageTail(page), page);
  98         VM_BUG_ON_PAGE(page_ref_count(page), page);
  99         set_page_count(page, 1);
 100 }
 101
 102 extern unsigned long highest_memmap_pfn;
 103
 104 /*
 105  * Maximum number of reclaim retries without progress before the OOM
 106  * killer is consider the only way forward.
 107  */
 108 #define MAX_RECLAIM_RETRIES 16
 109
 110 /*
 111  * in mm/vmscan.c:
 112  */
 113 extern int isolate_lru_page(struct page *page);
 114 extern void putback_lru_page(struct page *page);
 115
 116 /*
 117  * in mm/rmap.c:
 118  */
 119 extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
 120
 121 /*
 122  * in mm/page_alloc.c
 123  */
 124
 125 /*
 126  * Structure for holding the mostly immutable allocation parameters passed
 127  * between functions involved in allocations, including the alloc_pages*
 128  * family of functions.
 129  *
 130  * nodemask, migratetype and highest_zoneidx are initialized only once in
 131  * __alloc_pages_nodemask() and then never change.
 132  *
 133  * zonelist, preferred_zone and highest_zoneidx are set first in
 134  * __alloc_pages_nodemask() for the fast path, and might be later changed
 135  * in __alloc_pages_slowpath(). All other functions pass the whole strucure
 136  * by a const pointer.
 137  */
 138 struct alloc_context {
 139         struct zonelist *zonelist;
 140         nodemask_t *nodemask;
 141         struct zoneref *preferred_zoneref;
 142         int migratetype;
 143
 144         /*
 145          * highest_zoneidx represents highest usable zone index of
 146          * the allocation request. Due to the nature of the zone,
 147          * memory on lower zone than the highest_zoneidx will be
 148          * protected by lowmem_reserve[highest_zoneidx].
 149          *
 150          * highest_zoneidx is also used by reclaim/compaction to limit
 151          * the target zone since higher zone than this index cannot be
 152          * usable for this allocation request.
 153          */
 154         enum zone_type highest_zoneidx;
 155         bool spread_dirty_pages;
 156 };
 157
 158 /*
 159  * Locate the struct page for both the matching buddy in our
 160  * pair (buddy1) and the combined O(n+1) page they form (page).
 161  *
 162  * 1) Any buddy B1 will have an order O twin B2 which satisfies
 163  * the following equation:
 164  *     B2 = B1 ^ (1 << O)
 165  * For example, if the starting buddy (buddy2) is #8 its order
 166  * 1 buddy is #10:
 167  *     B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10
 168  *
 169  * 2) Any buddy B will have an order O+1 parent P which
 170  * satisfies the following equation:
 171  *     P = B & ~(1 << O)
 172  *
 173  * Assumption: *_mem_map is contiguous at least up to MAX_ORDER
 174  */
 175 static inline unsigned long
 176 __find_buddy_pfn(unsigned long page_pfn, unsigned int order)
 177 {
 178         return page_pfn ^ (1 << order);
 179 }
 180
 181 extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
 182                                 unsigned long end_pfn, struct zone *zone);
 183
 184 static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn,
 185                                 unsigned long end_pfn, struct zone *zone)
 186 {
 187         if (zone->contiguous)
 188                 return pfn_to_page(start_pfn);
 189
 190         return __pageblock_pfn_to_page(start_pfn, end_pfn, zone);
 191 }
 192
 193 extern int __isolate_free_page(struct page *page, unsigned int order);
 194 extern void __putback_isolated_page(struct page *page, unsigned int order,
 195                                     int mt);
 196 extern void memblock_free_pages(struct page *page, unsigned long pfn,
 197                                         unsigned int order);
 198 extern void __free_pages_core(struct page *page, unsigned int order);
 199 extern void prep_compound_page(struct page *page, unsigned int order);
 200 extern void post_alloc_hook(struct page *page, unsigned int order,
 201                                         gfp_t gfp_flags);
 202 extern int user_min_free_kbytes;
 203
 204 extern void zone_pcp_update(struct zone *zone);
 205 extern void zone_pcp_reset(struct zone *zone);
 206
 207 #if defined CONFIG_COMPACTION || defined CONFIG_CMA
 208
 209 /*
 210  * in mm/compaction.c
 211  */
 212 /*
 213  * compact_control is used to track pages being migrated and the free pages
 214  * they are being migrated to during memory compaction. The free_pfn starts
 215  * at the end of a zone and migrate_pfn begins at the start. Movable pages
 216  * are moved to the end of a zone during a compaction run and the run
 217  * completes when free_pfn <= migrate_pfn
 218  */
 219 struct compact_control {
 220         struct list_head freepages;     /* List of free pages to migrate to */
 221         struct list_head migratepages;  /* List of pages being migrated */
 222         unsigned int nr_freepages;      /* Number of isolated free pages */
 223         unsigned int nr_migratepages;   /* Number of pages to migrate */
 224         unsigned long free_pfn;         /* isolate_freepages search base */
 225         unsigned long migrate_pfn;      /* isolate_migratepages search base */
 226         unsigned long fast_start_pfn;   /* a pfn to start linear scan from */
 227         struct zone *zone;
 228         unsigned long total_migrate_scanned;
 229         unsigned long total_free_scanned;
 230         unsigned short fast_search_fail;/* failures to use free list searches */
 231         short search_order;             /* order to start a fast search at */
 232         const gfp_t gfp_mask;           /* gfp mask of a direct compactor */
 233         int order;                      /* order a direct compactor needs */
 234         int migratetype;                /* migratetype of direct compactor */
 235         const unsigned int alloc_flags; /* alloc flags of a direct compactor */
 236         const int highest_zoneidx;      /* zone index of a direct compactor */
 237         enum migrate_mode mode;         /* Async or sync migration mode */
 238         bool ignore_skip_hint;          /* Scan blocks even if marked skip */
 239         bool no_set_skip_hint;          /* Don't mark blocks for skipping */
 240         bool ignore_block_suitable;     /* Scan blocks considered unsuitable */
 241         bool direct_compaction;         /* False from kcompactd or /proc/... */
 242         bool whole_zone;                /* Whole zone should/has been scanned */
 243         bool contended;                 /* Signal lock or sched contention */
 244         bool rescan;                    /* Rescanning the same pageblock */
 245         bool alloc_contig;              /* alloc_contig_range allocation */
 246 };
 247
 248 /*
 249  * Used in direct compaction when a page should be taken from the freelists
 250  * immediately when one is created during the free path.
 251  */
 252 struct capture_control {
 253         struct compact_control *cc;
 254         struct page *page;
 255 };
 256
 257 unsigned long
 258 isolate_freepages_range(struct compact_control *cc,
 259                         unsigned long start_pfn, unsigned long end_pfn);
 260 unsigned long
 261 isolate_migratepages_range(struct compact_control *cc,
 262                            unsigned long low_pfn, unsigned long end_pfn);
 263 int find_suitable_fallback(struct free_area *area, unsigned int order,
 264                         int migratetype, bool only_stealable, bool *can_steal);
 265
 266 #endif
 267
 268 /*
 269  * This function returns the order of a free page in the buddy system. In
 270  * general, page_zone(page)->lock must be held by the caller to prevent the
 271  * page from being allocated in parallel and returning garbage as the order.
 272  * If a caller does not hold page_zone(page)->lock, it must guarantee that the
 273  * page cannot be allocated or merged in parallel. Alternatively, it must
 274  * handle invalid values gracefully, and use page_order_unsafe() below.
 275  */
 276 static inline unsigned int page_order(struct page *page)
 277 {
 278         /* PageBuddy() must be checked by the caller */
 279         return page_private(page);
 280 }
 281
 282 /*
 283  * Like page_order(), but for callers who cannot afford to hold the zone lock.
 284  * PageBuddy() should be checked first by the caller to minimize race window,
 285  * and invalid values must be handled gracefully.
 286  *
 287  * READ_ONCE is used so that if the caller assigns the result into a local
 288  * variable and e.g. tests it for valid range before using, the compiler cannot
 289  * decide to remove the variable and inline the page_private(page) multiple
 290  * times, potentially observing different values in the tests and the actual
 291  * use of the result.
 292  */
 293 #define page_order_unsafe(page)         READ_ONCE(page_private(page))
 294
 295 static inline bool is_cow_mapping(vm_flags_t flags)
 296 {
 297         return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
 298 }
 299
 300 /*
 301  * These three helpers classifies VMAs for virtual memory accounting.
 302  */
 303
 304 /*
 305  * Executable code area - executable, not writable, not stack
 306  */
 307 static inline bool is_exec_mapping(vm_flags_t flags)
 308 {
 309         return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC;
 310 }
 311
 312 /*
 313  * Stack area - atomatically grows in one direction
 314  *
 315  * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
 316  * do_mmap() forbids all other combinations.
 317  */
 318 static inline bool is_stack_mapping(vm_flags_t flags)
 319 {
 320         return (flags & VM_STACK) == VM_STACK;
 321 }
 322
 323 /*
 324  * Data area - private, writable, not stack
 325  */
 326 static inline bool is_data_mapping(vm_flags_t flags)
 327 {
 328         return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE;
 329 }
 330
 331 /* mm/util.c */
 332 void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
 333                 struct vm_area_struct *prev);
 334 void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma);
 335
 336 #ifdef CONFIG_MMU
 337 extern long populate_vma_page_range(struct vm_area_struct *vma,
 338                 unsigned long start, unsigned long end, int *nonblocking);
 339 extern void munlock_vma_pages_range(struct vm_area_struct *vma,
 340                         unsigned long start, unsigned long end);
 341 static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
 342 {
 343         munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
 344 }
 345
 346 /*
 347  * must be called with vma's mmap_sem held for read or write, and page locked.
 348  */
 349 extern void mlock_vma_page(struct page *page);
 350 extern unsigned int munlock_vma_page(struct page *page);
 351
 352 /*
 353  * Clear the page's PageMlocked().  This can be useful in a situation where
 354  * we want to unconditionally remove a page from the pagecache -- e.g.,
 355  * on truncation or freeing.
 356  *
 357  * It is legal to call this function for any page, mlocked or not.
 358  * If called for a page that is still mapped by mlocked vmas, all we do
 359  * is revert to lazy LRU behaviour -- semantics are not broken.
 360  */
 361 extern void clear_page_mlock(struct page *page);
 362
 363 /*
 364  * mlock_migrate_page - called only from migrate_misplaced_transhuge_page()
 365  * (because that does not go through the full procedure of migration ptes):
 366  * to migrate the Mlocked page flag; update statistics.
 367  */
 368 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
 369 {
 370         if (TestClearPageMlocked(page)) {
 371                 int nr_pages = hpage_nr_pages(page);
 372
 373                 /* Holding pmd lock, no change in irq context: __mod is safe */
 374                 __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
 375                 SetPageMlocked(newpage);
 376                 __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
 377         }
 378 }
 379
 380 extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
 381
 382 /*
 383  * At what user virtual address is page expected in @vma?
 384  */
 385 static inline unsigned long
 386 __vma_address(struct page *page, struct vm_area_struct *vma)
 387 {
 388         pgoff_t pgoff = page_to_pgoff(page);
 389         return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
 390 }
 391
 392 static inline unsigned long
 393 vma_address(struct page *page, struct vm_area_struct *vma)
 394 {
 395         unsigned long start, end;
 396
 397         start = __vma_address(page, vma);
 398         end = start + PAGE_SIZE * (hpage_nr_pages(page) - 1);
 399
 400         /* page should be within @vma mapping range */
 401         VM_BUG_ON_VMA(end < vma->vm_start || start >= vma->vm_end, vma);
 402
 403         return max(start, vma->vm_start);
 404 }
 405
 406 static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
 407                                                     struct file *fpin)
 408 {
 409         int flags = vmf->flags;
 410
 411         if (fpin)
 412                 return fpin;
 413
 414         /*
 415          * FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or
 416          * anything, so we only pin the file and drop the mmap_sem if only
 417          * FAULT_FLAG_ALLOW_RETRY is set, while this is the first attempt.
 418          */
 419         if (fault_flag_allow_retry_first(flags) &&
 420             !(flags & FAULT_FLAG_RETRY_NOWAIT)) {
 421                 fpin = get_file(vmf->vma->vm_file);
 422                 up_read(&vmf->vma->vm_mm->mmap_sem);
 423         }
 424         return fpin;
 425 }
 426
 427 #else /* !CONFIG_MMU */
 428 static inline void clear_page_mlock(struct page *page) { }
 429 static inline void mlock_vma_page(struct page *page) { }
 430 static inline void mlock_migrate_page(struct page *new, struct page *old) { }
 431
 432 #endif /* !CONFIG_MMU */
 433
 434 /*
 435  * Return the mem_map entry representing the 'offset' subpage within
 436  * the maximally aligned gigantic page 'base'.  Handle any discontiguity
 437  * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
 438  */
 439 static inline struct page *mem_map_offset(struct page *base, int offset)
 440 {
 441         if (unlikely(offset >= MAX_ORDER_NR_PAGES))
 442                 return nth_page(base, offset);
 443         return base + offset;
 444 }
 445
 446 /*
 447  * Iterator over all subpages within the maximally aligned gigantic
 448  * page 'base'.  Handle any discontiguity in the mem_map.
 449  */
 450 static inline struct page *mem_map_next(struct page *iter,
 451                                                 struct page *base, int offset)
 452 {
 453         if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
 454                 unsigned long pfn = page_to_pfn(base) + offset;
 455                 if (!pfn_valid(pfn))
 456                         return NULL;
 457                 return pfn_to_page(pfn);
 458         }
 459         return iter + 1;
 460 }
 461
 462 /* Memory initialisation debug and verification */
 463 enum mminit_level {
 464         MMINIT_WARNING,
 465         MMINIT_VERIFY,
 466         MMINIT_TRACE
 467 };
 468
 469 #ifdef CONFIG_DEBUG_MEMORY_INIT
 470
 471 extern int mminit_loglevel;
 472
 473 #define mminit_dprintk(level, prefix, fmt, arg...) \
 474 do { \
 475         if (level < mminit_loglevel) { \
 476                 if (level <= MMINIT_WARNING) \
 477                         pr_warn("mminit::" prefix " " fmt, ##arg);      \
 478                 else \
 479                         printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
 480         } \
 481 } while (0)
 482
 483 extern void mminit_verify_pageflags_layout(void);
 484 extern void mminit_verify_zonelist(void);
 485 #else
 486
 487 static inline void mminit_dprintk(enum mminit_level level,
 488                                 const char *prefix, const char *fmt, ...)
 489 {
 490 }
 491
 492 static inline void mminit_verify_pageflags_layout(void)
 493 {
 494 }
 495
 496 static inline void mminit_verify_zonelist(void)
 497 {
 498 }
 499 #endif /* CONFIG_DEBUG_MEMORY_INIT */
 500
 501 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
 502 #if defined(CONFIG_SPARSEMEM)
 503 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 504                                 unsigned long *end_pfn);
 505 #else
 506 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 507                                 unsigned long *end_pfn)
 508 {
 509 }
 510 #endif /* CONFIG_SPARSEMEM */
 511
 512 #define NODE_RECLAIM_NOSCAN     -2
 513 #define NODE_RECLAIM_FULL       -1
 514 #define NODE_RECLAIM_SOME       0
 515 #define NODE_RECLAIM_SUCCESS    1
 516
 517 #ifdef CONFIG_NUMA
 518 extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int);
 519 #else
 520 static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask,
 521                                 unsigned int order)
 522 {
 523         return NODE_RECLAIM_NOSCAN;
 524 }
 525 #endif
 526
 527 extern int hwpoison_filter(struct page *p);
 528
 529 extern u32 hwpoison_filter_dev_major;
 530 extern u32 hwpoison_filter_dev_minor;
 531 extern u64 hwpoison_filter_flags_mask;
 532 extern u64 hwpoison_filter_flags_value;
 533 extern u64 hwpoison_filter_memcg;
 534 extern u32 hwpoison_filter_enable;
 535
 536 extern unsigned long  __must_check vm_mmap_pgoff(struct file *, unsigned long,
 537         unsigned long, unsigned long,
 538         unsigned long, unsigned long);
 539
 540 extern void set_pageblock_order(void);
 541 unsigned long reclaim_clean_pages_from_list(struct zone *zone,
 542                                             struct list_head *page_list);
 543 /* The ALLOC_WMARK bits are used as an index to zone->watermark */
 544 #define ALLOC_WMARK_MIN         WMARK_MIN
 545 #define ALLOC_WMARK_LOW         WMARK_LOW
 546 #define ALLOC_WMARK_HIGH        WMARK_HIGH
 547 #define ALLOC_NO_WATERMARKS     0x04 /* don't check watermarks at all */
 548
 549 /* Mask to get the watermark bits */
 550 #define ALLOC_WMARK_MASK        (ALLOC_NO_WATERMARKS-1)
 551
 552 /*
 553  * Only MMU archs have async oom victim reclaim - aka oom_reaper so we
 554  * cannot assume a reduced access to memory reserves is sufficient for
 555  * !MMU
 556  */
 557 #ifdef CONFIG_MMU
 558 #define ALLOC_OOM               0x08
 559 #else
 560 #define ALLOC_OOM               ALLOC_NO_WATERMARKS
 561 #endif
 562
 563 #define ALLOC_HARDER             0x10 /* try to alloc harder */
 564 #define ALLOC_HIGH               0x20 /* __GFP_HIGH set */
 565 #define ALLOC_CPUSET             0x40 /* check for correct cpuset */
 566 #define ALLOC_CMA                0x80 /* allow allocations from CMA areas */
 567 #ifdef CONFIG_ZONE_DMA32
 568 #define ALLOC_NOFRAGMENT        0x100 /* avoid mixing pageblock types */
 569 #else
 570 #define ALLOC_NOFRAGMENT          0x0
 571 #endif
 572 #define ALLOC_KSWAPD            0x800 /* allow waking of kswapd, __GFP_KSWAPD_RECLAIM set */
 573
 574 enum ttu_flags;
 575 struct tlbflush_unmap_batch;
 576
 577
 578 /*
 579  * only for MM internal work items which do not depend on
 580  * any allocations or locks which might depend on allocations
 581  */
 582 extern struct workqueue_struct *mm_percpu_wq;
 583
 584 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
 585 void try_to_unmap_flush(void);
 586 void try_to_unmap_flush_dirty(void);
 587 void flush_tlb_batched_pending(struct mm_struct *mm);
 588 #else
 589 static inline void try_to_unmap_flush(void)
 590 {
 591 }
 592 static inline void try_to_unmap_flush_dirty(void)
 593 {
 594 }
 595 static inline void flush_tlb_batched_pending(struct mm_struct *mm)
 596 {
 597 }
 598 #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
 599
 600 extern const struct trace_print_flags pageflag_names[];
 601 extern const struct trace_print_flags vmaflag_names[];
 602 extern const struct trace_print_flags gfpflag_names[];
 603
 604 static inline bool is_migrate_highatomic(enum migratetype migratetype)
 605 {
 606         return migratetype == MIGRATE_HIGHATOMIC;
 607 }
 608
 609 static inline bool is_migrate_highatomic_page(struct page *page)
 610 {
 611         return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC;
 612 }
 613
 614 void setup_zone_pageset(struct zone *zone);
 615 extern struct page *alloc_new_node_page(struct page *page, unsigned long node);
 616 #endif  /* __MM_INTERNAL_H */