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 /* 100 * When kernel touch the user page, the user page may be have been marked 101 * poison but still mapped in user space, if without this page, the kernel 102 * can guarantee the data integrity and operation success, the kernel is 103 * better to check the posion status and avoid touching it, be good not to 104 * panic, coredump for process fatal signal is a sample case matching this 105 * scenario. Or if kernel can't guarantee the data integrity, it's better 106 * not to call this function, let kernel touch the poison page and get to 107 * panic. 108 */ 109 static inline bool is_page_poisoned(struct page *page) 110 { 111 if (PageHWPoison(page)) 112 return true; 113 else if (PageHuge(page) && PageHWPoison(compound_head(page))) 114 return true; 115 116 return false; 117 } 118 119 extern unsigned long highest_memmap_pfn; 120 121 /* 122 * Maximum number of reclaim retries without progress before the OOM 123 * killer is consider the only way forward. 124 */ 125 #define MAX_RECLAIM_RETRIES 16 126 127 /* 128 * in mm/vmscan.c: 129 */ 130 extern int isolate_lru_page(struct page *page); 131 extern void putback_lru_page(struct page *page); 132 133 /* 134 * in mm/rmap.c: 135 */ 136 extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); 137 138 /* 139 * in mm/page_alloc.c 140 */ 141 142 /* 143 * Structure for holding the mostly immutable allocation parameters passed 144 * between functions involved in allocations, including the alloc_pages* 145 * family of functions. 146 * 147 * nodemask, migratetype and highest_zoneidx are initialized only once in 148 * __alloc_pages() and then never change. 149 * 150 * zonelist, preferred_zone and highest_zoneidx are set first in 151 * __alloc_pages() for the fast path, and might be later changed 152 * in __alloc_pages_slowpath(). All other functions pass the whole structure 153 * by a const pointer. 154 */ 155 struct alloc_context { 156 struct zonelist *zonelist; 157 nodemask_t *nodemask; 158 struct zoneref *preferred_zoneref; 159 int migratetype; 160 161 /* 162 * highest_zoneidx represents highest usable zone index of 163 * the allocation request. Due to the nature of the zone, 164 * memory on lower zone than the highest_zoneidx will be 165 * protected by lowmem_reserve[highest_zoneidx]. 166 * 167 * highest_zoneidx is also used by reclaim/compaction to limit 168 * the target zone since higher zone than this index cannot be 169 * usable for this allocation request. 170 */ 171 enum zone_type highest_zoneidx; 172 bool spread_dirty_pages; 173 }; 174 175 /* 176 * Locate the struct page for both the matching buddy in our 177 * pair (buddy1) and the combined O(n+1) page they form (page). 178 * 179 * 1) Any buddy B1 will have an order O twin B2 which satisfies 180 * the following equation: 181 * B2 = B1 ^ (1 << O) 182 * For example, if the starting buddy (buddy2) is #8 its order 183 * 1 buddy is #10: 184 * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10 185 * 186 * 2) Any buddy B will have an order O+1 parent P which 187 * satisfies the following equation: 188 * P = B & ~(1 << O) 189 * 190 * Assumption: *_mem_map is contiguous at least up to MAX_ORDER 191 */ 192 static inline unsigned long 193 __find_buddy_pfn(unsigned long page_pfn, unsigned int order) 194 { 195 return page_pfn ^ (1 << order); 196 } 197 198 extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn, 199 unsigned long end_pfn, struct zone *zone); 200 201 static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn, 202 unsigned long end_pfn, struct zone *zone) 203 { 204 if (zone->contiguous) 205 return pfn_to_page(start_pfn); 206 207 return __pageblock_pfn_to_page(start_pfn, end_pfn, zone); 208 } 209 210 extern int __isolate_free_page(struct page *page, unsigned int order); 211 extern void __putback_isolated_page(struct page *page, unsigned int order, 212 int mt); 213 extern void memblock_free_pages(struct page *page, unsigned long pfn, 214 unsigned int order); 215 extern void __free_pages_core(struct page *page, unsigned int order); 216 extern void prep_compound_page(struct page *page, unsigned int order); 217 extern void post_alloc_hook(struct page *page, unsigned int order, 218 gfp_t gfp_flags); 219 extern int user_min_free_kbytes; 220 221 extern void free_unref_page(struct page *page); 222 extern void free_unref_page_list(struct list_head *list); 223 224 extern void zone_pcp_update(struct zone *zone); 225 extern void zone_pcp_reset(struct zone *zone); 226 extern void zone_pcp_disable(struct zone *zone); 227 extern void zone_pcp_enable(struct zone *zone); 228 229 #if defined CONFIG_COMPACTION || defined CONFIG_CMA 230 231 /* 232 * in mm/compaction.c 233 */ 234 /* 235 * compact_control is used to track pages being migrated and the free pages 236 * they are being migrated to during memory compaction. The free_pfn starts 237 * at the end of a zone and migrate_pfn begins at the start. Movable pages 238 * are moved to the end of a zone during a compaction run and the run 239 * completes when free_pfn <= migrate_pfn 240 */ 241 struct compact_control { 242 struct list_head freepages; /* List of free pages to migrate to */ 243 struct list_head migratepages; /* List of pages being migrated */ 244 unsigned int nr_freepages; /* Number of isolated free pages */ 245 unsigned int nr_migratepages; /* Number of pages to migrate */ 246 unsigned long free_pfn; /* isolate_freepages search base */ 247 /* 248 * Acts as an in/out parameter to page isolation for migration. 249 * isolate_migratepages uses it as a search base. 250 * isolate_migratepages_block will update the value to the next pfn 251 * after the last isolated one. 252 */ 253 unsigned long migrate_pfn; 254 unsigned long fast_start_pfn; /* a pfn to start linear scan from */ 255 struct zone *zone; 256 unsigned long total_migrate_scanned; 257 unsigned long total_free_scanned; 258 unsigned short fast_search_fail;/* failures to use free list searches */ 259 short search_order; /* order to start a fast search at */ 260 const gfp_t gfp_mask; /* gfp mask of a direct compactor */ 261 int order; /* order a direct compactor needs */ 262 int migratetype; /* migratetype of direct compactor */ 263 const unsigned int alloc_flags; /* alloc flags of a direct compactor */ 264 const int highest_zoneidx; /* zone index of a direct compactor */ 265 enum migrate_mode mode; /* Async or sync migration mode */ 266 bool ignore_skip_hint; /* Scan blocks even if marked skip */ 267 bool no_set_skip_hint; /* Don't mark blocks for skipping */ 268 bool ignore_block_suitable; /* Scan blocks considered unsuitable */ 269 bool direct_compaction; /* False from kcompactd or /proc/... */ 270 bool proactive_compaction; /* kcompactd proactive compaction */ 271 bool whole_zone; /* Whole zone should/has been scanned */ 272 bool contended; /* Signal lock or sched contention */ 273 bool rescan; /* Rescanning the same pageblock */ 274 bool alloc_contig; /* alloc_contig_range allocation */ 275 }; 276 277 /* 278 * Used in direct compaction when a page should be taken from the freelists 279 * immediately when one is created during the free path. 280 */ 281 struct capture_control { 282 struct compact_control *cc; 283 struct page *page; 284 }; 285 286 unsigned long 287 isolate_freepages_range(struct compact_control *cc, 288 unsigned long start_pfn, unsigned long end_pfn); 289 int 290 isolate_migratepages_range(struct compact_control *cc, 291 unsigned long low_pfn, unsigned long end_pfn); 292 int find_suitable_fallback(struct free_area *area, unsigned int order, 293 int migratetype, bool only_stealable, bool *can_steal); 294 295 #endif 296 297 /* 298 * This function returns the order of a free page in the buddy system. In 299 * general, page_zone(page)->lock must be held by the caller to prevent the 300 * page from being allocated in parallel and returning garbage as the order. 301 * If a caller does not hold page_zone(page)->lock, it must guarantee that the 302 * page cannot be allocated or merged in parallel. Alternatively, it must 303 * handle invalid values gracefully, and use buddy_order_unsafe() below. 304 */ 305 static inline unsigned int buddy_order(struct page *page) 306 { 307 /* PageBuddy() must be checked by the caller */ 308 return page_private(page); 309 } 310 311 /* 312 * Like buddy_order(), but for callers who cannot afford to hold the zone lock. 313 * PageBuddy() should be checked first by the caller to minimize race window, 314 * and invalid values must be handled gracefully. 315 * 316 * READ_ONCE is used so that if the caller assigns the result into a local 317 * variable and e.g. tests it for valid range before using, the compiler cannot 318 * decide to remove the variable and inline the page_private(page) multiple 319 * times, potentially observing different values in the tests and the actual 320 * use of the result. 321 */ 322 #define buddy_order_unsafe(page) READ_ONCE(page_private(page)) 323 324 /* 325 * These three helpers classifies VMAs for virtual memory accounting. 326 */ 327 328 /* 329 * Executable code area - executable, not writable, not stack 330 */ 331 static inline bool is_exec_mapping(vm_flags_t flags) 332 { 333 return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC; 334 } 335 336 /* 337 * Stack area - automatically grows in one direction 338 * 339 * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous: 340 * do_mmap() forbids all other combinations. 341 */ 342 static inline bool is_stack_mapping(vm_flags_t flags) 343 { 344 return (flags & VM_STACK) == VM_STACK; 345 } 346 347 /* 348 * Data area - private, writable, not stack 349 */ 350 static inline bool is_data_mapping(vm_flags_t flags) 351 { 352 return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE; 353 } 354 355 /* mm/util.c */ 356 void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, 357 struct vm_area_struct *prev); 358 void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma); 359 360 #ifdef CONFIG_MMU 361 extern long populate_vma_page_range(struct vm_area_struct *vma, 362 unsigned long start, unsigned long end, int *nonblocking); 363 extern void munlock_vma_pages_range(struct vm_area_struct *vma, 364 unsigned long start, unsigned long end); 365 static inline void munlock_vma_pages_all(struct vm_area_struct *vma) 366 { 367 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); 368 } 369 370 /* 371 * must be called with vma's mmap_lock held for read or write, and page locked. 372 */ 373 extern void mlock_vma_page(struct page *page); 374 extern unsigned int munlock_vma_page(struct page *page); 375 376 /* 377 * Clear the page's PageMlocked(). This can be useful in a situation where 378 * we want to unconditionally remove a page from the pagecache -- e.g., 379 * on truncation or freeing. 380 * 381 * It is legal to call this function for any page, mlocked or not. 382 * If called for a page that is still mapped by mlocked vmas, all we do 383 * is revert to lazy LRU behaviour -- semantics are not broken. 384 */ 385 extern void clear_page_mlock(struct page *page); 386 387 /* 388 * mlock_migrate_page - called only from migrate_misplaced_transhuge_page() 389 * (because that does not go through the full procedure of migration ptes): 390 * to migrate the Mlocked page flag; update statistics. 391 */ 392 static inline void mlock_migrate_page(struct page *newpage, struct page *page) 393 { 394 if (TestClearPageMlocked(page)) { 395 int nr_pages = thp_nr_pages(page); 396 397 /* Holding pmd lock, no change in irq context: __mod is safe */ 398 __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages); 399 SetPageMlocked(newpage); 400 __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages); 401 } 402 } 403 404 extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); 405 406 /* 407 * At what user virtual address is page expected in @vma? 408 */ 409 static inline unsigned long 410 __vma_address(struct page *page, struct vm_area_struct *vma) 411 { 412 pgoff_t pgoff = page_to_pgoff(page); 413 return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); 414 } 415 416 static inline unsigned long 417 vma_address(struct page *page, struct vm_area_struct *vma) 418 { 419 unsigned long start, end; 420 421 start = __vma_address(page, vma); 422 end = start + thp_size(page) - PAGE_SIZE; 423 424 /* page should be within @vma mapping range */ 425 VM_BUG_ON_VMA(end < vma->vm_start || start >= vma->vm_end, vma); 426 427 return max(start, vma->vm_start); 428 } 429 430 static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf, 431 struct file *fpin) 432 { 433 int flags = vmf->flags; 434 435 if (fpin) 436 return fpin; 437 438 /* 439 * FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or 440 * anything, so we only pin the file and drop the mmap_lock if only 441 * FAULT_FLAG_ALLOW_RETRY is set, while this is the first attempt. 442 */ 443 if (fault_flag_allow_retry_first(flags) && 444 !(flags & FAULT_FLAG_RETRY_NOWAIT)) { 445 fpin = get_file(vmf->vma->vm_file); 446 mmap_read_unlock(vmf->vma->vm_mm); 447 } 448 return fpin; 449 } 450 451 #else /* !CONFIG_MMU */ 452 static inline void clear_page_mlock(struct page *page) { } 453 static inline void mlock_vma_page(struct page *page) { } 454 static inline void mlock_migrate_page(struct page *new, struct page *old) { } 455 static inline void vunmap_range_noflush(unsigned long start, unsigned long end) 456 { 457 } 458 #endif /* !CONFIG_MMU */ 459 460 /* 461 * Return the mem_map entry representing the 'offset' subpage within 462 * the maximally aligned gigantic page 'base'. Handle any discontiguity 463 * in the mem_map at MAX_ORDER_NR_PAGES boundaries. 464 */ 465 static inline struct page *mem_map_offset(struct page *base, int offset) 466 { 467 if (unlikely(offset >= MAX_ORDER_NR_PAGES)) 468 return nth_page(base, offset); 469 return base + offset; 470 } 471 472 /* 473 * Iterator over all subpages within the maximally aligned gigantic 474 * page 'base'. Handle any discontiguity in the mem_map. 475 */ 476 static inline struct page *mem_map_next(struct page *iter, 477 struct page *base, int offset) 478 { 479 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { 480 unsigned long pfn = page_to_pfn(base) + offset; 481 if (!pfn_valid(pfn)) 482 return NULL; 483 return pfn_to_page(pfn); 484 } 485 return iter + 1; 486 } 487 488 /* Memory initialisation debug and verification */ 489 enum mminit_level { 490 MMINIT_WARNING, 491 MMINIT_VERIFY, 492 MMINIT_TRACE 493 }; 494 495 #ifdef CONFIG_DEBUG_MEMORY_INIT 496 497 extern int mminit_loglevel; 498 499 #define mminit_dprintk(level, prefix, fmt, arg...) \ 500 do { \ 501 if (level < mminit_loglevel) { \ 502 if (level <= MMINIT_WARNING) \ 503 pr_warn("mminit::" prefix " " fmt, ##arg); \ 504 else \ 505 printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \ 506 } \ 507 } while (0) 508 509 extern void mminit_verify_pageflags_layout(void); 510 extern void mminit_verify_zonelist(void); 511 #else 512 513 static inline void mminit_dprintk(enum mminit_level level, 514 const char *prefix, const char *fmt, ...) 515 { 516 } 517 518 static inline void mminit_verify_pageflags_layout(void) 519 { 520 } 521 522 static inline void mminit_verify_zonelist(void) 523 { 524 } 525 #endif /* CONFIG_DEBUG_MEMORY_INIT */ 526 527 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ 528 #if defined(CONFIG_SPARSEMEM) 529 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, 530 unsigned long *end_pfn); 531 #else 532 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, 533 unsigned long *end_pfn) 534 { 535 } 536 #endif /* CONFIG_SPARSEMEM */ 537 538 #define NODE_RECLAIM_NOSCAN -2 539 #define NODE_RECLAIM_FULL -1 540 #define NODE_RECLAIM_SOME 0 541 #define NODE_RECLAIM_SUCCESS 1 542 543 #ifdef CONFIG_NUMA 544 extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int); 545 #else 546 static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask, 547 unsigned int order) 548 { 549 return NODE_RECLAIM_NOSCAN; 550 } 551 #endif 552 553 extern int hwpoison_filter(struct page *p); 554 555 extern u32 hwpoison_filter_dev_major; 556 extern u32 hwpoison_filter_dev_minor; 557 extern u64 hwpoison_filter_flags_mask; 558 extern u64 hwpoison_filter_flags_value; 559 extern u64 hwpoison_filter_memcg; 560 extern u32 hwpoison_filter_enable; 561 562 extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long, 563 unsigned long, unsigned long, 564 unsigned long, unsigned long); 565 566 extern void set_pageblock_order(void); 567 unsigned int reclaim_clean_pages_from_list(struct zone *zone, 568 struct list_head *page_list); 569 /* The ALLOC_WMARK bits are used as an index to zone->watermark */ 570 #define ALLOC_WMARK_MIN WMARK_MIN 571 #define ALLOC_WMARK_LOW WMARK_LOW 572 #define ALLOC_WMARK_HIGH WMARK_HIGH 573 #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */ 574 575 /* Mask to get the watermark bits */ 576 #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1) 577 578 /* 579 * Only MMU archs have async oom victim reclaim - aka oom_reaper so we 580 * cannot assume a reduced access to memory reserves is sufficient for 581 * !MMU 582 */ 583 #ifdef CONFIG_MMU 584 #define ALLOC_OOM 0x08 585 #else 586 #define ALLOC_OOM ALLOC_NO_WATERMARKS 587 #endif 588 589 #define ALLOC_HARDER 0x10 /* try to alloc harder */ 590 #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ 591 #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ 592 #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */ 593 #ifdef CONFIG_ZONE_DMA32 594 #define ALLOC_NOFRAGMENT 0x100 /* avoid mixing pageblock types */ 595 #else 596 #define ALLOC_NOFRAGMENT 0x0 597 #endif 598 #define ALLOC_KSWAPD 0x800 /* allow waking of kswapd, __GFP_KSWAPD_RECLAIM set */ 599 600 enum ttu_flags; 601 struct tlbflush_unmap_batch; 602 603 604 /* 605 * only for MM internal work items which do not depend on 606 * any allocations or locks which might depend on allocations 607 */ 608 extern struct workqueue_struct *mm_percpu_wq; 609 610 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH 611 void try_to_unmap_flush(void); 612 void try_to_unmap_flush_dirty(void); 613 void flush_tlb_batched_pending(struct mm_struct *mm); 614 #else 615 static inline void try_to_unmap_flush(void) 616 { 617 } 618 static inline void try_to_unmap_flush_dirty(void) 619 { 620 } 621 static inline void flush_tlb_batched_pending(struct mm_struct *mm) 622 { 623 } 624 #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */ 625 626 extern const struct trace_print_flags pageflag_names[]; 627 extern const struct trace_print_flags vmaflag_names[]; 628 extern const struct trace_print_flags gfpflag_names[]; 629 630 static inline bool is_migrate_highatomic(enum migratetype migratetype) 631 { 632 return migratetype == MIGRATE_HIGHATOMIC; 633 } 634 635 static inline bool is_migrate_highatomic_page(struct page *page) 636 { 637 return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC; 638 } 639 640 void setup_zone_pageset(struct zone *zone); 641 642 struct migration_target_control { 643 int nid; /* preferred node id */ 644 nodemask_t *nmask; 645 gfp_t gfp_mask; 646 }; 647 648 /* 649 * mm/vmalloc.c 650 */ 651 #ifdef CONFIG_MMU 652 int vmap_pages_range_noflush(unsigned long addr, unsigned long end, 653 pgprot_t prot, struct page **pages, unsigned int page_shift); 654 #else 655 static inline 656 int vmap_pages_range_noflush(unsigned long addr, unsigned long end, 657 pgprot_t prot, struct page **pages, unsigned int page_shift) 658 { 659 return -EINVAL; 660 } 661 #endif 662 663 void vunmap_range_noflush(unsigned long start, unsigned long end); 664 665 #endif /* __MM_INTERNAL_H */ 666