internal.h 20.5 KB
Newer Older
1
/* SPDX-License-Identifier: GPL-2.0-or-later */
L
Linus Torvalds 已提交
2 3 4 5 6
/* internal.h: mm/ internal definitions
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */
7 8 9
#ifndef __MM_INTERNAL_H
#define __MM_INTERNAL_H

10
#include <linux/fs.h>
11
#include <linux/mm.h>
12
#include <linux/pagemap.h>
13
#include <linux/tracepoint-defs.h>
L
Linus Torvalds 已提交
14

15 16 17 18 19 20 21
/*
 * The set of flags that only affect watermark checking and reclaim
 * behaviour. This is used by the MM to obey the caller constraints
 * about IO, FS and watermark checking while ignoring placement
 * hints such as HIGHMEM usage.
 */
#define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\
22
			__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NOFAIL|\
23 24
			__GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC|\
			__GFP_ATOMIC)
25 26 27 28 29 30 31 32 33 34

/* The GFP flags allowed during early boot */
#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS))

/* Control allocation cpuset and node placement constraints */
#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)

/* Do not use these with a slab allocator */
#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)

35 36
void page_writeback_init(void);

37
vm_fault_t do_swap_page(struct vm_fault *vmf);
38

39 40 41
void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
		unsigned long floor, unsigned long ceiling);

M
Minchan Kim 已提交
42
static inline bool can_madv_lru_vma(struct vm_area_struct *vma)
43 44 45 46
{
	return !(vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP));
}

47 48 49 50 51
void unmap_page_range(struct mmu_gather *tlb,
			     struct vm_area_struct *vma,
			     unsigned long addr, unsigned long end,
			     struct zap_details *details);

52 53
void do_page_cache_ra(struct readahead_control *, unsigned long nr_to_read,
		unsigned long lookahead_size);
54
void force_page_cache_ra(struct readahead_control *, unsigned long nr);
55 56 57
static inline void force_page_cache_readahead(struct address_space *mapping,
		struct file *file, pgoff_t index, unsigned long nr_to_read)
{
58 59
	DEFINE_READAHEAD(ractl, file, &file->f_ra, mapping, index);
	force_page_cache_ra(&ractl, nr_to_read);
60
}
61

62 63 64
unsigned find_lock_entries(struct address_space *mapping, pgoff_t start,
		pgoff_t end, struct pagevec *pvec, pgoff_t *indices);

65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
/**
 * page_evictable - test whether a page is evictable
 * @page: the page to test
 *
 * Test whether page is evictable--i.e., should be placed on active/inactive
 * lists vs unevictable list.
 *
 * Reasons page might not be evictable:
 * (1) page's mapping marked unevictable
 * (2) page is part of an mlocked VMA
 *
 */
static inline bool page_evictable(struct page *page)
{
	bool ret;

	/* Prevent address_space of inode and swap cache from being freed */
	rcu_read_lock();
	ret = !mapping_unevictable(page_mapping(page)) && !PageMlocked(page);
	rcu_read_unlock();
	return ret;
}

88
/*
89
 * Turn a non-refcounted page (->_refcount == 0) into refcounted with
90 91 92 93
 * a count of one.
 */
static inline void set_page_refcounted(struct page *page)
{
94
	VM_BUG_ON_PAGE(PageTail(page), page);
95
	VM_BUG_ON_PAGE(page_ref_count(page), page);
96 97 98
	set_page_count(page, 1);
}

99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
/*
 * When kernel touch the user page, the user page may be have been marked
 * poison but still mapped in user space, if without this page, the kernel
 * can guarantee the data integrity and operation success, the kernel is
 * better to check the posion status and avoid touching it, be good not to
 * panic, coredump for process fatal signal is a sample case matching this
 * scenario. Or if kernel can't guarantee the data integrity, it's better
 * not to call this function, let kernel touch the poison page and get to
 * panic.
 */
static inline bool is_page_poisoned(struct page *page)
{
	if (PageHWPoison(page))
		return true;
	else if (PageHuge(page) && PageHWPoison(compound_head(page)))
		return true;

	return false;
}

119 120
extern unsigned long highest_memmap_pfn;

121 122 123 124 125 126
/*
 * Maximum number of reclaim retries without progress before the OOM
 * killer is consider the only way forward.
 */
#define MAX_RECLAIM_RETRIES 16

127 128 129
/*
 * in mm/vmscan.c:
 */
130
extern int isolate_lru_page(struct page *page);
131
extern void putback_lru_page(struct page *page);
132

B
Bob Liu 已提交
133 134 135 136 137
/*
 * in mm/rmap.c:
 */
extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);

138 139 140
/*
 * in mm/page_alloc.c
 */
141

142 143 144 145 146
/*
 * Structure for holding the mostly immutable allocation parameters passed
 * between functions involved in allocations, including the alloc_pages*
 * family of functions.
 *
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
153 154 155 156 157
 * by a const pointer.
 */
struct alloc_context {
	struct zonelist *zonelist;
	nodemask_t *nodemask;
158
	struct zoneref *preferred_zoneref;
159
	int migratetype;
160 161 162 163 164 165 166 167 168 169 170 171

	/*
	 * highest_zoneidx represents highest usable zone index of
	 * the allocation request. Due to the nature of the zone,
	 * memory on lower zone than the highest_zoneidx will be
	 * protected by lowmem_reserve[highest_zoneidx].
	 *
	 * highest_zoneidx is also used by reclaim/compaction to limit
	 * the target zone since higher zone than this index cannot be
	 * usable for this allocation request.
	 */
	enum zone_type highest_zoneidx;
172
	bool spread_dirty_pages;
173 174
};

175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192
/*
 * Locate the struct page for both the matching buddy in our
 * pair (buddy1) and the combined O(n+1) page they form (page).
 *
 * 1) Any buddy B1 will have an order O twin B2 which satisfies
 * the following equation:
 *     B2 = B1 ^ (1 << O)
 * For example, if the starting buddy (buddy2) is #8 its order
 * 1 buddy is #10:
 *     B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10
 *
 * 2) Any buddy B will have an order O+1 parent P which
 * satisfies the following equation:
 *     P = B & ~(1 << O)
 *
 * Assumption: *_mem_map is contiguous at least up to MAX_ORDER
 */
static inline unsigned long
193
__find_buddy_pfn(unsigned long page_pfn, unsigned int order)
194
{
195
	return page_pfn ^ (1 << order);
196 197
}

198 199 200 201 202 203 204 205 206 207 208 209
extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
				unsigned long end_pfn, struct zone *zone);

static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn,
				unsigned long end_pfn, struct zone *zone)
{
	if (zone->contiguous)
		return pfn_to_page(start_pfn);

	return __pageblock_pfn_to_page(start_pfn, end_pfn, zone);
}

210
extern int __isolate_free_page(struct page *page, unsigned int order);
211 212
extern void __putback_isolated_page(struct page *page, unsigned int order,
				    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);
217 218
extern void post_alloc_hook(struct page *page, unsigned int order,
					gfp_t gfp_flags);
219
extern int user_min_free_kbytes;
220

221 222 223
extern void free_unref_page(struct page *page);
extern void free_unref_page_list(struct list_head *list);

224 225
extern void zone_pcp_update(struct zone *zone);
extern void zone_pcp_reset(struct zone *zone);
226 227
extern void zone_pcp_disable(struct zone *zone);
extern void zone_pcp_enable(struct zone *zone);
228

229 230 231 232 233 234 235 236 237 238 239 240 241 242 243
#if defined CONFIG_COMPACTION || defined CONFIG_CMA

/*
 * in mm/compaction.c
 */
/*
 * compact_control is used to track pages being migrated and the free pages
 * they are being migrated to during memory compaction. The free_pfn starts
 * at the end of a zone and migrate_pfn begins at the start. Movable pages
 * are moved to the end of a zone during a compaction run and the run
 * completes when free_pfn <= migrate_pfn
 */
struct compact_control {
	struct list_head freepages;	/* List of free pages to migrate to */
	struct list_head migratepages;	/* List of pages being migrated */
244 245
	unsigned int nr_freepages;	/* Number of isolated free pages */
	unsigned int nr_migratepages;	/* Number of pages to migrate */
246
	unsigned long free_pfn;		/* isolate_freepages search base */
247 248 249 250 251 252 253
	/*
	 * Acts as an in/out parameter to page isolation for migration.
	 * isolate_migratepages uses it as a search base.
	 * isolate_migratepages_block will update the value to the next pfn
	 * after the last isolated one.
	 */
	unsigned long migrate_pfn;
254
	unsigned long fast_start_pfn;	/* a pfn to start linear scan from */
255 256 257
	struct zone *zone;
	unsigned long total_migrate_scanned;
	unsigned long total_free_scanned;
258 259
	unsigned short fast_search_fail;/* failures to use free list searches */
	short search_order;		/* order to start a fast search at */
260 261
	const gfp_t gfp_mask;		/* gfp mask of a direct compactor */
	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/... */
N
Nitin Gupta 已提交
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
};

277 278 279 280 281 282 283 284 285
/*
 * Used in direct compaction when a page should be taken from the freelists
 * immediately when one is created during the free path.
 */
struct capture_control {
	struct compact_control *cc;
	struct page *page;
};

286
unsigned long
287 288
isolate_freepages_range(struct compact_control *cc,
			unsigned long start_pfn, unsigned long end_pfn);
289
int
290 291
isolate_migratepages_range(struct compact_control *cc,
			   unsigned long low_pfn, unsigned long end_pfn);
292 293
int find_suitable_fallback(struct free_area *area, unsigned int order,
			int migratetype, bool only_stealable, bool *can_steal);
294 295

#endif
296

297
/*
298 299 300 301
 * This function returns the order of a free page in the buddy system. In
 * general, page_zone(page)->lock must be held by the caller to prevent the
 * page from being allocated in parallel and returning garbage as the order.
 * 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 */
308 309
	return page_private(page);
}
310

311
/*
312
 * Like buddy_order(), but for callers who cannot afford to hold the zone lock.
313 314 315
 * PageBuddy() should be checked first by the caller to minimize race window,
 * and invalid values must be handled gracefully.
 *
316
 * READ_ONCE is used so that if the caller assigns the result into a local
317 318 319 320 321
 * variable and e.g. tests it for valid range before using, the compiler cannot
 * decide to remove the variable and inline the page_private(page) multiple
 * times, potentially observing different values in the tests and the actual
 * use of the result.
 */
322
#define buddy_order_unsafe(page)	READ_ONCE(page_private(page))
323

324 325 326 327 328 329 330
/*
 * These three helpers classifies VMAs for virtual memory accounting.
 */

/*
 * Executable code area - executable, not writable, not stack
 */
331 332
static inline bool is_exec_mapping(vm_flags_t flags)
{
333
	return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC;
334 335
}

336 337 338 339 340 341
/*
 * Stack area - atomatically grows in one direction
 *
 * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
 * do_mmap() forbids all other combinations.
 */
342 343
static inline bool is_stack_mapping(vm_flags_t flags)
{
344
	return (flags & VM_STACK) == VM_STACK;
345 346
}

347 348 349
/*
 * Data area - private, writable, not stack
 */
350 351
static inline bool is_data_mapping(vm_flags_t flags)
{
352
	return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE;
353 354
}

355 356
/* mm/util.c */
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);
363 364 365 366 367 368 369
extern void munlock_vma_pages_range(struct vm_area_struct *vma,
			unsigned long start, unsigned long end);
static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
{
	munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
}

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);
375 376 377 378 379 380 381 382 383 384

/*
 * Clear the page's PageMlocked().  This can be useful in a situation where
 * we want to unconditionally remove a page from the pagecache -- e.g.,
 * on truncation or freeing.
 *
 * It is legal to call this function for any page, mlocked or not.
 * If called for a page that is still mapped by mlocked vmas, all we do
 * is revert to lazy LRU behaviour -- semantics are not broken.
 */
385
extern void clear_page_mlock(struct page *page);
386 387

/*
388 389 390
 * mlock_migrate_page - called only from migrate_misplaced_transhuge_page()
 * (because that does not go through the full procedure of migration ptes):
 * to migrate the Mlocked page flag; update statistics.
391 392 393
 */
static inline void mlock_migrate_page(struct page *newpage, struct page *page)
{
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

406 407 408 409 410 411 412 413 414 415 416 417 418
/*
 * At what user virtual address is page expected in @vma?
 */
static inline unsigned long
__vma_address(struct page *page, struct vm_area_struct *vma)
{
	pgoff_t pgoff = page_to_pgoff(page);
	return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
}

static inline unsigned long
vma_address(struct page *page, struct vm_area_struct *vma)
{
419 420 421
	unsigned long start, end;

	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
}

430 431 432 433 434 435 436 437 438 439
static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
						    struct file *fpin)
{
	int flags = vmf->flags;

	if (fpin)
		return fpin;

	/*
	 * 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
	 */
443 444
	if (fault_flag_allow_retry_first(flags) &&
	    !(flags & FAULT_FLAG_RETRY_NOWAIT)) {
445
		fpin = get_file(vmf->vma->vm_file);
446
		mmap_read_unlock(vmf->vma->vm_mm);
447 448 449 450
	}
	return fpin;
}

451
#else /* !CONFIG_MMU */
452 453 454
static inline void clear_page_mlock(struct page *page) { }
static inline void mlock_vma_page(struct page *page) { }
static inline void mlock_migrate_page(struct page *new, struct page *old) { }
455 456 457
static inline void vunmap_range_noflush(unsigned long start, unsigned long end)
{
}
458
#endif /* !CONFIG_MMU */
459

460 461 462 463 464 465 466 467
/*
 * Return the mem_map entry representing the 'offset' subpage within
 * the maximally aligned gigantic page 'base'.  Handle any discontiguity
 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
 */
static inline struct page *mem_map_offset(struct page *base, int offset)
{
	if (unlikely(offset >= MAX_ORDER_NR_PAGES))
468
		return nth_page(base, offset);
469 470 471 472
	return base + offset;
}

/*
L
Lucas De Marchi 已提交
473
 * Iterator over all subpages within the maximally aligned gigantic
474 475 476 477 478 479 480 481 482 483 484 485 486 487
 * page 'base'.  Handle any discontiguity in the mem_map.
 */
static inline struct page *mem_map_next(struct page *iter,
						struct page *base, int offset)
{
	if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
		unsigned long pfn = page_to_pfn(base) + offset;
		if (!pfn_valid(pfn))
			return NULL;
		return pfn_to_page(pfn);
	}
	return iter + 1;
}

488 489 490 491 492 493 494 495 496 497 498 499 500 501
/* Memory initialisation debug and verification */
enum mminit_level {
	MMINIT_WARNING,
	MMINIT_VERIFY,
	MMINIT_TRACE
};

#ifdef CONFIG_DEBUG_MEMORY_INIT

extern int mminit_loglevel;

#define mminit_dprintk(level, prefix, fmt, arg...) \
do { \
	if (level < mminit_loglevel) { \
502
		if (level <= MMINIT_WARNING) \
503
			pr_warn("mminit::" prefix " " fmt, ##arg);	\
504 505
		else \
			printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
506 507 508
	} \
} while (0)

509
extern void mminit_verify_pageflags_layout(void);
510
extern void mminit_verify_zonelist(void);
511 512 513 514 515 516 517
#else

static inline void mminit_dprintk(enum mminit_level level,
				const char *prefix, const char *fmt, ...)
{
}

518 519 520 521
static inline void mminit_verify_pageflags_layout(void)
{
}

522 523 524
static inline void mminit_verify_zonelist(void)
{
}
525
#endif /* CONFIG_DEBUG_MEMORY_INIT */
526 527 528 529 530 531 532 533 534 535 536 537

/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
#if defined(CONFIG_SPARSEMEM)
extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
				unsigned long *end_pfn);
#else
static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
				unsigned long *end_pfn)
{
}
#endif /* CONFIG_SPARSEMEM */

538 539 540 541
#define NODE_RECLAIM_NOSCAN	-2
#define NODE_RECLAIM_FULL	-1
#define NODE_RECLAIM_SOME	0
#define NODE_RECLAIM_SUCCESS	1
542

543 544 545 546 547 548 549 550 551 552
#ifdef CONFIG_NUMA
extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int);
#else
static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask,
				unsigned int order)
{
	return NODE_RECLAIM_NOSCAN;
}
#endif

553 554
extern int hwpoison_filter(struct page *p);

555 556
extern u32 hwpoison_filter_dev_major;
extern u32 hwpoison_filter_dev_minor;
557 558
extern u64 hwpoison_filter_flags_mask;
extern u64 hwpoison_filter_flags_value;
559
extern u64 hwpoison_filter_memcg;
560
extern u32 hwpoison_filter_enable;
A
Al Viro 已提交
561

562
extern unsigned long  __must_check vm_mmap_pgoff(struct file *, unsigned long,
A
Al Viro 已提交
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);
569 570 571 572 573 574 575 576 577
/* The ALLOC_WMARK bits are used as an index to zone->watermark */
#define ALLOC_WMARK_MIN		WMARK_MIN
#define ALLOC_WMARK_LOW		WMARK_LOW
#define ALLOC_WMARK_HIGH	WMARK_HIGH
#define ALLOC_NO_WATERMARKS	0x04 /* don't check watermarks at all */

/* Mask to get the watermark bits */
#define ALLOC_WMARK_MASK	(ALLOC_NO_WATERMARKS-1)

578 579 580 581 582 583 584 585 586 587 588
/*
 * Only MMU archs have async oom victim reclaim - aka oom_reaper so we
 * cannot assume a reduced access to memory reserves is sufficient for
 * !MMU
 */
#ifdef CONFIG_MMU
#define ALLOC_OOM		0x08
#else
#define ALLOC_OOM		ALLOC_NO_WATERMARKS
#endif

589 590 591 592 593 594 595 596 597
#define ALLOC_HARDER		 0x10 /* try to alloc harder */
#define ALLOC_HIGH		 0x20 /* __GFP_HIGH set */
#define ALLOC_CPUSET		 0x40 /* check for correct cpuset */
#define ALLOC_CMA		 0x80 /* allow allocations from CMA areas */
#ifdef CONFIG_ZONE_DMA32
#define ALLOC_NOFRAGMENT	0x100 /* avoid mixing pageblock types */
#else
#define ALLOC_NOFRAGMENT	  0x0
#endif
598
#define ALLOC_KSWAPD		0x800 /* allow waking of kswapd, __GFP_KSWAPD_RECLAIM set */
599

600 601 602
enum ttu_flags;
struct tlbflush_unmap_batch;

603 604 605 606 607 608 609

/*
 * only for MM internal work items which do not depend on
 * any allocations or locks which might depend on allocations
 */
extern struct workqueue_struct *mm_percpu_wq;

610 611
#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
void try_to_unmap_flush(void);
612
void try_to_unmap_flush_dirty(void);
613
void flush_tlb_batched_pending(struct mm_struct *mm);
614 615 616 617
#else
static inline void try_to_unmap_flush(void)
{
}
618 619 620
static inline void try_to_unmap_flush_dirty(void)
{
}
621 622 623
static inline void flush_tlb_batched_pending(struct mm_struct *mm)
{
}
624
#endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
625 626 627 628 629

extern const struct trace_print_flags pageflag_names[];
extern const struct trace_print_flags vmaflag_names[];
extern const struct trace_print_flags gfpflag_names[];

630 631 632 633 634 635 636 637 638 639
static inline bool is_migrate_highatomic(enum migratetype migratetype)
{
	return migratetype == MIGRATE_HIGHATOMIC;
}

static inline bool is_migrate_highatomic_page(struct page *page)
{
	return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC;
}

640
void setup_zone_pageset(struct zone *zone);
641 642 643 644 645 646 647

struct migration_target_control {
	int nid;		/* preferred node id */
	nodemask_t *nmask;
	gfp_t gfp_mask;
};

648 649 650
/*
 * mm/vmalloc.c
 */
651
#ifdef CONFIG_MMU
652 653
int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
                pgprot_t prot, struct page **pages, unsigned int page_shift);
654 655 656 657 658 659 660 661 662 663
#else
static inline
int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
                pgprot_t prot, struct page **pages, unsigned int page_shift)
{
	return -EINVAL;
}
#endif

void vunmap_range_noflush(unsigned long start, unsigned long end);
664

665
#endif	/* __MM_INTERNAL_H */
新手
引导
客服 返回
顶部