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 __putback_isolated_page(struct page *page, unsigned int order,
 184                                     int mt);
 185 extern void memblock_free_pages(struct page *page, unsigned long pfn,
 186                                         unsigned int order);
 187 extern void __free_pages_core(struct page *page, unsigned int order);
 188 extern void prep_compound_page(struct page *page, unsigned int order);
 189 extern void post_alloc_hook(struct page *page, unsigned int order,
 190                                         gfp_t gfp_flags);
 191 extern int user_min_free_kbytes;
 192
 193 extern void zone_pcp_update(struct zone *zone);
 194 extern void zone_pcp_reset(struct zone *zone);
 195
 196 #if defined CONFIG_COMPACTION || defined CONFIG_CMA
 197
 198 /*
 199  * in mm/compaction.c
 200  */
 201 /*
 202  * compact_control is used to track pages being migrated and the free pages
 203  * they are being migrated to during memory compaction. The free_pfn starts
 204  * at the end of a zone and migrate_pfn begins at the start. Movable pages
 205  * are moved to the end of a zone during a compaction run and the run
 206  * completes when free_pfn <= migrate_pfn
 207  */
 208 struct compact_control {
 209         struct list_head freepages;     /* List of free pages to migrate to */
 210         struct list_head migratepages;  /* List of pages being migrated */
 211         unsigned int nr_freepages;      /* Number of isolated free pages */
 212         unsigned int nr_migratepages;   /* Number of pages to migrate */
 213         unsigned long free_pfn;         /* isolate_freepages search base */
 214         unsigned long migrate_pfn;      /* isolate_migratepages search base */
 215         unsigned long fast_start_pfn;   /* a pfn to start linear scan from */
 216         struct zone *zone;
 217         unsigned long total_migrate_scanned;
 218         unsigned long total_free_scanned;
 219         unsigned short fast_search_fail;/* failures to use free list searches */
 220         short search_order;             /* order to start a fast search at */
 221         const gfp_t gfp_mask;           /* gfp mask of a direct compactor */
 222         int order;                      /* order a direct compactor needs */
 223         int migratetype;                /* migratetype of direct compactor */
 224         const unsigned int alloc_flags; /* alloc flags of a direct compactor */
 225         const int classzone_idx;        /* zone index of a direct compactor */
 226         enum migrate_mode mode;         /* Async or sync migration mode */
 227         bool ignore_skip_hint;          /* Scan blocks even if marked skip */
 228         bool no_set_skip_hint;          /* Don't mark blocks for skipping */
 229         bool ignore_block_suitable;     /* Scan blocks considered unsuitable */
 230         bool direct_compaction;         /* False from kcompactd or /proc/... */
 231         bool whole_zone;                /* Whole zone should/has been scanned */
 232         bool contended;                 /* Signal lock or sched contention */
 233         bool rescan;                    /* Rescanning the same pageblock */
 234         bool alloc_contig;              /* alloc_contig_range allocation */
 235 };
 236
 237 /*
 238  * Used in direct compaction when a page should be taken from the freelists
 239  * immediately when one is created during the free path.
 240  */
 241 struct capture_control {
 242         struct compact_control *cc;
 243         struct page *page;
 244 };
 245
 246 unsigned long
 247 isolate_freepages_range(struct compact_control *cc,
 248                         unsigned long start_pfn, unsigned long end_pfn);
 249 unsigned long
 250 isolate_migratepages_range(struct compact_control *cc,
 251                            unsigned long low_pfn, unsigned long end_pfn);
 252 int find_suitable_fallback(struct free_area *area, unsigned int order,
 253                         int migratetype, bool only_stealable, bool *can_steal);
 254
 255 #endif
 256
 257 /*
 258  * This function returns the order of a free page in the buddy system. In
 259  * general, page_zone(page)->lock must be held by the caller to prevent the
 260  * page from being allocated in parallel and returning garbage as the order.
 261  * If a caller does not hold page_zone(page)->lock, it must guarantee that the
 262  * page cannot be allocated or merged in parallel. Alternatively, it must
 263  * handle invalid values gracefully, and use page_order_unsafe() below.
 264  */
 265 static inline unsigned int page_order(struct page *page)
 266 {
 267         /* PageBuddy() must be checked by the caller */
 268         return page_private(page);
 269 }
 270
 271 /*
 272  * Like page_order(), but for callers who cannot afford to hold the zone lock.
 273  * PageBuddy() should be checked first by the caller to minimize race window,
 274  * and invalid values must be handled gracefully.
 275  *
 276  * READ_ONCE is used so that if the caller assigns the result into a local
 277  * variable and e.g. tests it for valid range before using, the compiler cannot
 278  * decide to remove the variable and inline the page_private(page) multiple
 279  * times, potentially observing different values in the tests and the actual
 280  * use of the result.
 281  */
 282 #define page_order_unsafe(page)         READ_ONCE(page_private(page))
 283
 284 static inline bool is_cow_mapping(vm_flags_t flags)
 285 {
 286         return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
 287 }
 288
 289 /*
 290  * These three helpers classifies VMAs for virtual memory accounting.
 291  */
 292
 293 /*
 294  * Executable code area - executable, not writable, not stack
 295  */
 296 static inline bool is_exec_mapping(vm_flags_t flags)
 297 {
 298         return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC;
 299 }
 300
 301 /*
 302  * Stack area - atomatically grows in one direction
 303  *
 304  * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
 305  * do_mmap() forbids all other combinations.
 306  */
 307 static inline bool is_stack_mapping(vm_flags_t flags)
 308 {
 309         return (flags & VM_STACK) == VM_STACK;
 310 }
 311
 312 /*
 313  * Data area - private, writable, not stack
 314  */
 315 static inline bool is_data_mapping(vm_flags_t flags)
 316 {
 317         return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE;
 318 }
 319
 320 /* mm/util.c */
 321 void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
 322                 struct vm_area_struct *prev);
 323 void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma);
 324
 325 #ifdef CONFIG_MMU
 326 extern long populate_vma_page_range(struct vm_area_struct *vma,
 327                 unsigned long start, unsigned long end, int *nonblocking);
 328 extern void munlock_vma_pages_range(struct vm_area_struct *vma,
 329                         unsigned long start, unsigned long end);
 330 static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
 331 {
 332         munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
 333 }
 334
 335 /*
 336  * must be called with vma's mmap_sem held for read or write, and page locked.
 337  */
 338 extern void mlock_vma_page(struct page *page);
 339 extern unsigned int munlock_vma_page(struct page *page);
 340
 341 /*
 342  * Clear the page's PageMlocked().  This can be useful in a situation where
 343  * we want to unconditionally remove a page from the pagecache -- e.g.,
 344  * on truncation or freeing.
 345  *
 346  * It is legal to call this function for any page, mlocked or not.
 347  * If called for a page that is still mapped by mlocked vmas, all we do
 348  * is revert to lazy LRU behaviour -- semantics are not broken.
 349  */
 350 extern void clear_page_mlock(struct page *page);
 351
 352 /*
 353  * mlock_migrate_page - called only from migrate_misplaced_transhuge_page()
 354  * (because that does not go through the full procedure of migration ptes):
 355  * to migrate the Mlocked page flag; update statistics.
 356  */
 357 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
 358 {
 359         if (TestClearPageMlocked(page)) {
 360                 int nr_pages = hpage_nr_pages(page);
 361
 362                 /* Holding pmd lock, no change in irq context: __mod is safe */
 363                 __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
 364                 SetPageMlocked(newpage);
 365                 __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
 366         }
 367 }
 368
 369 extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
 370
 371 /*
 372  * At what user virtual address is page expected in @vma?
 373  */
 374 static inline unsigned long
 375 __vma_address(struct page *page, struct vm_area_struct *vma)
 376 {
 377         pgoff_t pgoff = page_to_pgoff(page);
 378         return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
 379 }
 380
 381 static inline unsigned long
 382 vma_address(struct page *page, struct vm_area_struct *vma)
 383 {
 384         unsigned long start, end;
 385
 386         start = __vma_address(page, vma);
 387         end = start + PAGE_SIZE * (hpage_nr_pages(page) - 1);
 388
 389         /* page should be within @vma mapping range */
 390         VM_BUG_ON_VMA(end < vma->vm_start || start >= vma->vm_end, vma);
 391
 392         return max(start, vma->vm_start);
 393 }
 394
 395 static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
 396                                                     struct file *fpin)
 397 {
 398         int flags = vmf->flags;
 399
 400         if (fpin)
 401                 return fpin;
 402
 403         /*
 404          * FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or
 405          * anything, so we only pin the file and drop the mmap_sem if only
 406          * FAULT_FLAG_ALLOW_RETRY is set, while this is the first attempt.
 407          */
 408         if (fault_flag_allow_retry_first(flags) &&
 409             !(flags & FAULT_FLAG_RETRY_NOWAIT)) {
 410                 fpin = get_file(vmf->vma->vm_file);
 411                 up_read(&vmf->vma->vm_mm->mmap_sem);
 412         }
 413         return fpin;
 414 }
 415
 416 #else /* !CONFIG_MMU */
 417 static inline void clear_page_mlock(struct page *page) { }
 418 static inline void mlock_vma_page(struct page *page) { }
 419 static inline void mlock_migrate_page(struct page *new, struct page *old) { }
 420
 421 #endif /* !CONFIG_MMU */
 422
 423 /*
 424  * Return the mem_map entry representing the 'offset' subpage within
 425  * the maximally aligned gigantic page 'base'.  Handle any discontiguity
 426  * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
 427  */
 428 static inline struct page *mem_map_offset(struct page *base, int offset)
 429 {
 430         if (unlikely(offset >= MAX_ORDER_NR_PAGES))
 431                 return nth_page(base, offset);
 432         return base + offset;
 433 }
 434
 435 /*
 436  * Iterator over all subpages within the maximally aligned gigantic
 437  * page 'base'.  Handle any discontiguity in the mem_map.
 438  */
 439 static inline struct page *mem_map_next(struct page *iter,
 440                                                 struct page *base, int offset)
 441 {
 442         if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
 443                 unsigned long pfn = page_to_pfn(base) + offset;
 444                 if (!pfn_valid(pfn))
 445                         return NULL;
 446                 return pfn_to_page(pfn);
 447         }
 448         return iter + 1;
 449 }
 450
 451 /* Memory initialisation debug and verification */
 452 enum mminit_level {
 453         MMINIT_WARNING,
 454         MMINIT_VERIFY,
 455         MMINIT_TRACE
 456 };
 457
 458 #ifdef CONFIG_DEBUG_MEMORY_INIT
 459
 460 extern int mminit_loglevel;
 461
 462 #define mminit_dprintk(level, prefix, fmt, arg...) \
 463 do { \
 464         if (level < mminit_loglevel) { \
 465                 if (level <= MMINIT_WARNING) \
 466                         pr_warn("mminit::" prefix " " fmt, ##arg);      \
 467                 else \
 468                         printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
 469         } \
 470 } while (0)
 471
 472 extern void mminit_verify_pageflags_layout(void);
 473 extern void mminit_verify_zonelist(void);
 474 #else
 475
 476 static inline void mminit_dprintk(enum mminit_level level,
 477                                 const char *prefix, const char *fmt, ...)
 478 {
 479 }
 480
 481 static inline void mminit_verify_pageflags_layout(void)
 482 {
 483 }
 484
 485 static inline void mminit_verify_zonelist(void)
 486 {
 487 }
 488 #endif /* CONFIG_DEBUG_MEMORY_INIT */
 489
 490 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
 491 #if defined(CONFIG_SPARSEMEM)
 492 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 493                                 unsigned long *end_pfn);
 494 #else
 495 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 496                                 unsigned long *end_pfn)
 497 {
 498 }
 499 #endif /* CONFIG_SPARSEMEM */
 500
 501 #define NODE_RECLAIM_NOSCAN     -2
 502 #define NODE_RECLAIM_FULL       -1
 503 #define NODE_RECLAIM_SOME       0
 504 #define NODE_RECLAIM_SUCCESS    1
 505
 506 #ifdef CONFIG_NUMA
 507 extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int);
 508 #else
 509 static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask,
 510                                 unsigned int order)
 511 {
 512         return NODE_RECLAIM_NOSCAN;
 513 }
 514 #endif
 515
 516 extern int hwpoison_filter(struct page *p);
 517
 518 extern u32 hwpoison_filter_dev_major;
 519 extern u32 hwpoison_filter_dev_minor;
 520 extern u64 hwpoison_filter_flags_mask;
 521 extern u64 hwpoison_filter_flags_value;
 522 extern u64 hwpoison_filter_memcg;
 523 extern u32 hwpoison_filter_enable;
 524
 525 extern unsigned long  __must_check vm_mmap_pgoff(struct file *, unsigned long,
 526         unsigned long, unsigned long,
 527         unsigned long, unsigned long);
 528
 529 extern void set_pageblock_order(void);
 530 unsigned long reclaim_clean_pages_from_list(struct zone *zone,
 531                                             struct list_head *page_list);
 532 /* The ALLOC_WMARK bits are used as an index to zone->watermark */
 533 #define ALLOC_WMARK_MIN         WMARK_MIN
 534 #define ALLOC_WMARK_LOW         WMARK_LOW
 535 #define ALLOC_WMARK_HIGH        WMARK_HIGH
 536 #define ALLOC_NO_WATERMARKS     0x04 /* don't check watermarks at all */
 537
 538 /* Mask to get the watermark bits */
 539 #define ALLOC_WMARK_MASK        (ALLOC_NO_WATERMARKS-1)
 540
 541 /*
 542  * Only MMU archs have async oom victim reclaim - aka oom_reaper so we
 543  * cannot assume a reduced access to memory reserves is sufficient for
 544  * !MMU
 545  */
 546 #ifdef CONFIG_MMU
 547 #define ALLOC_OOM               0x08
 548 #else
 549 #define ALLOC_OOM               ALLOC_NO_WATERMARKS
 550 #endif
 551
 552 #define ALLOC_HARDER             0x10 /* try to alloc harder */
 553 #define ALLOC_HIGH               0x20 /* __GFP_HIGH set */
 554 #define ALLOC_CPUSET             0x40 /* check for correct cpuset */
 555 #define ALLOC_CMA                0x80 /* allow allocations from CMA areas */
 556 #ifdef CONFIG_ZONE_DMA32
 557 #define ALLOC_NOFRAGMENT        0x100 /* avoid mixing pageblock types */
 558 #else
 559 #define ALLOC_NOFRAGMENT          0x0
 560 #endif
 561 #define ALLOC_KSWAPD            0x800 /* allow waking of kswapd, __GFP_KSWAPD_RECLAIM set */
 562
 563 enum ttu_flags;
 564 struct tlbflush_unmap_batch;
 565
 566
 567 /*
 568  * only for MM internal work items which do not depend on
 569  * any allocations or locks which might depend on allocations
 570  */
 571 extern struct workqueue_struct *mm_percpu_wq;
 572
 573 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
 574 void try_to_unmap_flush(void);
 575 void try_to_unmap_flush_dirty(void);
 576 void flush_tlb_batched_pending(struct mm_struct *mm);
 577 #else
 578 static inline void try_to_unmap_flush(void)
 579 {
 580 }
 581 static inline void try_to_unmap_flush_dirty(void)
 582 {
 583 }
 584 static inline void flush_tlb_batched_pending(struct mm_struct *mm)
 585 {
 586 }
 587 #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
 588
 589 extern const struct trace_print_flags pageflag_names[];
 590 extern const struct trace_print_flags vmaflag_names[];
 591 extern const struct trace_print_flags gfpflag_names[];
 592
 593 static inline bool is_migrate_highatomic(enum migratetype migratetype)
 594 {
 595         return migratetype == MIGRATE_HIGHATOMIC;
 596 }
 597
 598 static inline bool is_migrate_highatomic_page(struct page *page)
 599 {
 600         return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC;
 601 }
 602
 603 void setup_zone_pageset(struct zone *zone);
 604 extern struct page *alloc_new_node_page(struct page *page, unsigned long node);
 605 #endif  /* __MM_INTERNAL_H */