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