1 #ifndef _LINUX_MM_H
2 #define _LINUX_MM_H
3
4 #include <linux/errno.h>
5
6 #ifdef __KERNEL__
7
8 #include <linux/gfp.h>
9 #include <linux/list.h>
10 #include <linux/mmzone.h>
11 #include <linux/rbtree.h>
12 #include <linux/prio_tree.h>
13 #include <linux/debug_locks.h>
14 #include <linux/mm_types.h>
15
16 struct mempolicy;
17 struct anon_vma;
18 struct file_ra_state;
19 struct user_struct;
20 struct writeback_control;
21
22 #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
23 extern unsigned long max_mapnr;
24 #endif
25
26 extern unsigned long num_physpages;
27 extern void * high_memory;
28 extern int page_cluster;
29
30 #ifdef CONFIG_SYSCTL
31 extern int sysctl_legacy_va_layout;
32 #else
33 #define sysctl_legacy_va_layout 0
34 #endif
35
36 extern unsigned long mmap_min_addr;
37
38 #include <asm/page.h>
39 #include <asm/pgtable.h>
40 #include <asm/processor.h>
41
42 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
43
44 /*
45 * Linux kernel virtual memory manager primitives.
46 * The idea being to have a "virtual" mm in the same way
47 * we have a virtual fs - giving a cleaner interface to the
48 * mm details, and allowing different kinds of memory mappings
49 * (from shared memory to executable loading to arbitrary
50 * mmap() functions).
51 */
52
53 extern struct kmem_cache *vm_area_cachep;
54
55 /*
56 * This struct defines the per-mm list of VMAs for uClinux. If CONFIG_MMU is
57 * disabled, then there's a single shared list of VMAs maintained by the
58 * system, and mm's subscribe to these individually
59 */
60 struct vm_list_struct {
61 struct vm_list_struct *next;
62 struct vm_area_struct *vma;
63 };
64
65 #ifndef CONFIG_MMU
66 extern struct rb_root nommu_vma_tree;
67 extern struct rw_semaphore nommu_vma_sem;
68
69 extern unsigned int kobjsize(const void *objp);
70 #endif
71
72 /*
73 * vm_flags..
74 */
75 #define VM_READ 0x00000001 /* currently active flags */
76 #define VM_WRITE 0x00000002
77 #define VM_EXEC 0x00000004
78 #define VM_SHARED 0x00000008
79
80 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
81 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
82 #define VM_MAYWRITE 0x00000020
83 #define VM_MAYEXEC 0x00000040
84 #define VM_MAYSHARE 0x00000080
85
86 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
87 #define VM_GROWSUP 0x00000200
88 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
89 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
90
91 #define VM_EXECUTABLE 0x00001000
92 #define VM_LOCKED 0x00002000
93 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
94
95 /* Used by sys_madvise() */
96 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
97 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
98
99 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
100 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
101 #define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */
102 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
103 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
104 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
105 #define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
106 #define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */
107 #define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */
108
109 #define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */
110
111 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
112 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
113 #endif
114
115 #ifdef CONFIG_STACK_GROWSUP
116 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
117 #else
118 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
119 #endif
120
121 #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
122 #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
123 #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
124 #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
125 #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
126
127 /*
128 * mapping from the currently active vm_flags protection bits (the
129 * low four bits) to a page protection mask..
130 */
131 extern pgprot_t protection_map[16];
132
133 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
134 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
135
136
137 /*
138 * vm_fault is filled by the the pagefault handler and passed to the vma's
139 * ->fault function. The vma's ->fault is responsible for returning a bitmask
140 * of VM_FAULT_xxx flags that give details about how the fault was handled.
141 *
142 * pgoff should be used in favour of virtual_address, if possible. If pgoff
143 * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear
144 * mapping support.
145 */
146 struct vm_fault {
147 unsigned int flags; /* FAULT_FLAG_xxx flags */
148 pgoff_t pgoff; /* Logical page offset based on vma */
149 void __user *virtual_address; /* Faulting virtual address */
150
151 struct page *page; /* ->fault handlers should return a
152 * page here, unless VM_FAULT_NOPAGE
153 * is set (which is also implied by
154 * VM_FAULT_ERROR).
155 */
156 };
157
158 /*
159 * These are the virtual MM functions - opening of an area, closing and
160 * unmapping it (needed to keep files on disk up-to-date etc), pointer
161 * to the functions called when a no-page or a wp-page exception occurs.
162 */
163 struct vm_operations_struct {
164 void (*open)(struct vm_area_struct * area);
165 void (*close)(struct vm_area_struct * area);
166 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
167 struct page *(*nopage)(struct vm_area_struct *area,
168 unsigned long address, int *type);
169 unsigned long (*nopfn)(struct vm_area_struct *area,
170 unsigned long address);
171
172 /* notification that a previously read-only page is about to become
173 * writable, if an error is returned it will cause a SIGBUS */
174 int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page);
175 #ifdef CONFIG_NUMA
176 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
177 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
178 unsigned long addr);
179 int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,
180 const nodemask_t *to, unsigned long flags);
181 #endif
182 };
183
184 struct mmu_gather;
185 struct inode;
186
187 #define page_private(page) ((page)->private)
188 #define set_page_private(page, v) ((page)->private = (v))
189
190 /*
191 * FIXME: take this include out, include page-flags.h in
192 * files which need it (119 of them)
193 */
194 #include <linux/page-flags.h>
195
196 #ifdef CONFIG_DEBUG_VM
197 #define VM_BUG_ON(cond) BUG_ON(cond)
198 #else
199 #define VM_BUG_ON(condition) do { } while(0)
200 #endif
201
202 /*
203 * Methods to modify the page usage count.
204 *
205 * What counts for a page usage:
206 * - cache mapping (page->mapping)
207 * - private data (page->private)
208 * - page mapped in a task's page tables, each mapping
209 * is counted separately
210 *
211 * Also, many kernel routines increase the page count before a critical
212 * routine so they can be sure the page doesn't go away from under them.
213 */
214
215 /*
216 * Drop a ref, return true if the refcount fell to zero (the page has no users)
217 */
218 static inline int put_page_testzero(struct page *page)
219 {
220 VM_BUG_ON(atomic_read(&page->_count) == 0);
221 return atomic_dec_and_test(&page->_count);
222 }
223
224 /*
225 * Try to grab a ref unless the page has a refcount of zero, return false if
226 * that is the case.
227 */
228 static inline int get_page_unless_zero(struct page *page)
229 {
230 VM_BUG_ON(PageTail(page));
231 return atomic_inc_not_zero(&page->_count);
232 }
233
234 /* Support for virtually mapped pages */
235 struct page *vmalloc_to_page(const void *addr);
236 unsigned long vmalloc_to_pfn(const void *addr);
237
238 /*
239 * Determine if an address is within the vmalloc range
240 *
241 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
242 * is no special casing required.
243 */
244 static inline int is_vmalloc_addr(const void *x)
245 {
246 #ifdef CONFIG_MMU
247 unsigned long addr = (unsigned long)x;
248
249 return addr >= VMALLOC_START && addr < VMALLOC_END;
250 #else
251 return 0;
252 #endif
253 }
254
255 static inline struct page *compound_head(struct page *page)
256 {
257 if (unlikely(PageTail(page)))
258 return page->first_page;
259 return page;
260 }
261
262 static inline int page_count(struct page *page)
263 {
264 return atomic_read(&compound_head(page)->_count);
265 }
266
267 static inline void get_page(struct page *page)
268 {
269 page = compound_head(page);
270 VM_BUG_ON(atomic_read(&page->_count) == 0);
271 atomic_inc(&page->_count);
272 }
273
274 static inline struct page *virt_to_head_page(const void *x)
275 {
276 struct page *page = virt_to_page(x);
277 return compound_head(page);
278 }
279
280 /*
281 * Setup the page count before being freed into the page allocator for
282 * the first time (boot or memory hotplug)
283 */
284 static inline void init_page_count(struct page *page)
285 {
286 atomic_set(&page->_count, 1);
287 }
288
289 void put_page(struct page *page);
290 void put_pages_list(struct list_head *pages);
291
292 void split_page(struct page *page, unsigned int order);
293
294 /*
295 * Compound pages have a destructor function. Provide a
296 * prototype for that function and accessor functions.
297 * These are _only_ valid on the head of a PG_compound page.
298 */
299 typedef void compound_page_dtor(struct page *);
300
301 static inline void set_compound_page_dtor(struct page *page,
302 compound_page_dtor *dtor)
303 {
304 page[1].lru.next = (void *)dtor;
305 }
306
307 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
308 {
309 return (compound_page_dtor *)page[1].lru.next;
310 }
311
312 static inline int compound_order(struct page *page)
313 {
314 if (!PageHead(page))
315 return 0;
316 return (unsigned long)page[1].lru.prev;
317 }
318
319 static inline void set_compound_order(struct page *page, unsigned long order)
320 {
321 page[1].lru.prev = (void *)order;
322 }
323
324 /*
325 * Multiple processes may "see" the same page. E.g. for untouched
326 * mappings of /dev/null, all processes see the same page full of
327 * zeroes, and text pages of executables and shared libraries have
328 * only one copy in memory, at most, normally.
329 *
330 * For the non-reserved pages, page_count(page) denotes a reference count.
331 * page_count() == 0 means the page is free. page->lru is then used for
332 * freelist management in the buddy allocator.
333 * page_count() > 0 means the page has been allocated.
334 *
335 * Pages are allocated by the slab allocator in order to provide memory
336 * to kmalloc and kmem_cache_alloc. In this case, the management of the
337 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
338 * unless a particular usage is carefully commented. (the responsibility of
339 * freeing the kmalloc memory is the caller's, of course).
340 *
341 * A page may be used by anyone else who does a __get_free_page().
342 * In this case, page_count still tracks the references, and should only
343 * be used through the normal accessor functions. The top bits of page->flags
344 * and page->virtual store page management information, but all other fields
345 * are unused and could be used privately, carefully. The management of this
346 * page is the responsibility of the one who allocated it, and those who have
347 * subsequently been given references to it.
348 *
349 * The other pages (we may call them "pagecache pages") are completely
350 * managed by the Linux memory manager: I/O, buffers, swapping etc.
351 * The following discussion applies only to them.
352 *
353 * A pagecache page contains an opaque `private' member, which belongs to the
354 * page's address_space. Usually, this is the address of a circular list of
355 * the page's disk buffers. PG_private must be set to tell the VM to call
356 * into the filesystem to release these pages.
357 *
358 * A page may belong to an inode's memory mapping. In this case, page->mapping
359 * is the pointer to the inode, and page->index is the file offset of the page,
360 * in units of PAGE_CACHE_SIZE.
361 *
362 * If pagecache pages are not associated with an inode, they are said to be
363 * anonymous pages. These may become associated with the swapcache, and in that
364 * case PG_swapcache is set, and page->private is an offset into the swapcache.
365 *
366 * In either case (swapcache or inode backed), the pagecache itself holds one
367 * reference to the page. Setting PG_private should also increment the
368 * refcount. The each user mapping also has a reference to the page.
369 *
370 * The pagecache pages are stored in a per-mapping radix tree, which is
371 * rooted at mapping->page_tree, and indexed by offset.
372 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
373 * lists, we instead now tag pages as dirty/writeback in the radix tree.
374 *
375 * All pagecache pages may be subject to I/O:
376 * - inode pages may need to be read from disk,
377 * - inode pages which have been modified and are MAP_SHARED may need
378 * to be written back to the inode on disk,
379 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
380 * modified may need to be swapped out to swap space and (later) to be read
381 * back into memory.
382 */
383
384 /*
385 * The zone field is never updated after free_area_init_core()
386 * sets it, so none of the operations on it need to be atomic.
387 */
388
389
390 /*
391 * page->flags layout:
392 *
393 * There are three possibilities for how page->flags get
394 * laid out. The first is for the normal case, without
395 * sparsemem. The second is for sparsemem when there is
396 * plenty of space for node and section. The last is when
397 * we have run out of space and have to fall back to an
398 * alternate (slower) way of determining the node.
399 *
400 * No sparsemem: | NODE | ZONE | ... | FLAGS |
401 * with space for node: | SECTION | NODE | ZONE | ... | FLAGS |
402 * no space for node: | SECTION | ZONE | ... | FLAGS |
403 */
404 #ifdef CONFIG_SPARSEMEM
405 #define SECTIONS_WIDTH SECTIONS_SHIFT
406 #else
407 #define SECTIONS_WIDTH 0
408 #endif
409
410 #define ZONES_WIDTH ZONES_SHIFT
411
412 #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= FLAGS_RESERVED
413 #define NODES_WIDTH NODES_SHIFT
414 #else
415 #define NODES_WIDTH 0
416 #endif
417
418 /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */
419 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
420 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
421 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
422
423 /*
424 * We are going to use the flags for the page to node mapping if its in
425 * there. This includes the case where there is no node, so it is implicit.
426 */
427 #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0)
428 #define NODE_NOT_IN_PAGE_FLAGS
429 #endif
430
431 #ifndef PFN_SECTION_SHIFT
432 #define PFN_SECTION_SHIFT 0
433 #endif
434
435 /*
436 * Define the bit shifts to access each section. For non-existant
437 * sections we define the shift as 0; that plus a 0 mask ensures
438 * the compiler will optimise away reference to them.
439 */
440 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
441 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
442 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
443
444 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allcator */
445 #ifdef NODE_NOT_IN_PAGEFLAGS
446 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
447 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
448 SECTIONS_PGOFF : ZONES_PGOFF)
449 #else
450 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
451 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
452 NODES_PGOFF : ZONES_PGOFF)
453 #endif
454
455 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
456
457 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED
458 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED
459 #endif
460
461 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
462 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
463 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
464 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
465
466 static inline enum zone_type page_zonenum(struct page *page)
467 {
468 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
469 }
470
471 /*
472 * The identification function is only used by the buddy allocator for
473 * determining if two pages could be buddies. We are not really
474 * identifying a zone since we could be using a the section number
475 * id if we have not node id available in page flags.
476 * We guarantee only that it will return the same value for two
477 * combinable pages in a zone.
478 */
479 static inline int page_zone_id(struct page *page)
480 {
481 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
482 }
483
484 static inline int zone_to_nid(struct zone *zone)
485 {
486 #ifdef CONFIG_NUMA
487 return zone->node;
488 #else
489 return 0;
490 #endif
491 }
492
493 #ifdef NODE_NOT_IN_PAGE_FLAGS
494 extern int page_to_nid(struct page *page);
495 #else
496 static inline int page_to_nid(struct page *page)
497 {
498 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
499 }
500 #endif
501
502 static inline struct zone *page_zone(struct page *page)
503 {
504 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
505 }
506
507 static inline unsigned long page_to_section(struct page *page)
508 {
509 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
510 }
511
512 static inline void set_page_zone(struct page *page, enum zone_type zone)
513 {
514 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
515 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
516 }
517
518 static inline void set_page_node(struct page *page, unsigned long node)
519 {
520 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
521 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
522 }
523
524 static inline void set_page_section(struct page *page, unsigned long section)
525 {
526 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
527 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
528 }
529
530 static inline void set_page_links(struct page *page, enum zone_type zone,
531 unsigned long node, unsigned long pfn)
532 {
533 set_page_zone(page, zone);
534 set_page_node(page, node);
535 set_page_section(page, pfn_to_section_nr(pfn));
536 }
537
538 /*
539 * If a hint addr is less than mmap_min_addr change hint to be as
540 * low as possible but still greater than mmap_min_addr
541 */
542 static inline unsigned long round_hint_to_min(unsigned long hint)
543 {
544 #ifdef CONFIG_SECURITY
545 hint &= PAGE_MASK;
546 if (((void *)hint != NULL) &&
547 (hint < mmap_min_addr))
548 return PAGE_ALIGN(mmap_min_addr);
549 #endif
550 return hint;
551 }
552
553 /*
554 * Some inline functions in vmstat.h depend on page_zone()
555 */
556 #include <linux/vmstat.h>
557
558 static __always_inline void *lowmem_page_address(struct page *page)
559 {
560 return __va(page_to_pfn(page) << PAGE_SHIFT);
561 }
562
563 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
564 #define HASHED_PAGE_VIRTUAL
565 #endif
566
567 #if defined(WANT_PAGE_VIRTUAL)
568 /*
569 * wrap page->virtual so it is safe to set/read locklessly
570 */
571 #define page_address(page) \
572 ({ typeof((page)->virtual) v = (page)->virtual; \
573 smp_read_barrier_depends(); \
574 v; })
575
576 static inline int set_page_address(struct page *page, void *address)
577 {
578 if (address)
579 return cmpxchg(&page->virtual, NULL, address) == NULL;
580 else {
581 /*
582 * cmpxchg is a bit abused because it is not guaranteed
583 * safe wrt direct assignment on all platforms.
584 */
585 void *virt = page->virtual;
586 return cmpxchg(&page->vitrual, virt, NULL) == virt;
587 }
588 }
589 void page_address_init(void);
590 #endif
591
592 #if defined(HASHED_PAGE_VIRTUAL)
593 void *page_address(struct page *page);
594 int set_page_address(struct page *page, void *virtual);
595 void page_address_init(void);
596 #endif
597
598 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
599 #define page_address(page) lowmem_page_address(page)
600 #define set_page_address(page, address) (0)
601 #define page_address_init() do { } while(0)
602 #endif
603
604 /*
605 * On an anonymous page mapped into a user virtual memory area,
606 * page->mapping points to its anon_vma, not to a struct address_space;
607 * with the PAGE_MAPPING_ANON bit set to distinguish it.
608 *
609 * Please note that, confusingly, "page_mapping" refers to the inode
610 * address_space which maps the page from disk; whereas "page_mapped"
611 * refers to user virtual address space into which the page is mapped.
612 */
613 #define PAGE_MAPPING_ANON 1
614
615 extern struct address_space swapper_space;
616 static inline struct address_space *page_mapping(struct page *page)
617 {
618 struct address_space *mapping = page->mapping;
619
620 VM_BUG_ON(PageSlab(page));
621 if (unlikely(PageSwapCache(page)))
622 mapping = &swapper_space;
623 else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
624 mapping = NULL;
625 return mapping;
626 }
627
628 static inline int PageAnon(struct page *page)
629 {
630 return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
631 }
632
633 /*
634 * Return the pagecache index of the passed page. Regular pagecache pages
635 * use ->index whereas swapcache pages use ->private
636 */
637 static inline pgoff_t page_index(struct page *page)
638 {
639 if (unlikely(PageSwapCache(page)))
640 return page_private(page);
641 return page->index;
642 }
643
644 /*
645 * The atomic page->_mapcount, like _count, starts from -1:
646 * so that transitions both from it and to it can be tracked,
647 * using atomic_inc_and_test and atomic_add_negative(-1).
648 */
649 static inline void reset_page_mapcount(struct page *page)
650 {
651 atomic_set(&(page)->_mapcount, -1);
652 }
653
654 static inline int page_mapcount(struct page *page)
655 {
656 return atomic_read(&(page)->_mapcount) + 1;
657 }
658
659 /*
660 * Return true if this page is mapped into pagetables.
661 */
662 static inline int page_mapped(struct page *page)
663 {
664 return atomic_read(&(page)->_mapcount) >= 0;
665 }
666
667 /*
668 * Error return values for the *_nopage functions
669 */
670 #define NOPAGE_SIGBUS (NULL)
671 #define NOPAGE_OOM ((struct page *) (-1))
672
673 /*
674 * Error return values for the *_nopfn functions
675 */
676 #define NOPFN_SIGBUS ((unsigned long) -1)
677 #define NOPFN_OOM ((unsigned long) -2)
678 #define NOPFN_REFAULT ((unsigned long) -3)
679
680 /*
681 * Different kinds of faults, as returned by handle_mm_fault().
682 * Used to decide whether a process gets delivered SIGBUS or
683 * just gets major/minor fault counters bumped up.
684 */
685
686 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
687
688 #define VM_FAULT_OOM 0x0001
689 #define VM_FAULT_SIGBUS 0x0002
690 #define VM_FAULT_MAJOR 0x0004
691 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
692
693 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
694 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
695
696 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS)
697
698 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
699
700 extern void show_free_areas(void);
701
702 #ifdef CONFIG_SHMEM
703 int shmem_lock(struct file *file, int lock, struct user_struct *user);
704 #else
705 static inline int shmem_lock(struct file *file, int lock,
706 struct user_struct *user)
707 {
708 return 0;
709 }
710 #endif
711 struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags);
712
713 int shmem_zero_setup(struct vm_area_struct *);
714
715 #ifndef CONFIG_MMU
716 extern unsigned long shmem_get_unmapped_area(struct file *file,
717 unsigned long addr,
718 unsigned long len,
719 unsigned long pgoff,
720 unsigned long flags);
721 #endif
722
723 extern int can_do_mlock(void);
724 extern int user_shm_lock(size_t, struct user_struct *);
725 extern void user_shm_unlock(size_t, struct user_struct *);
726
727 /*
728 * Parameter block passed down to zap_pte_range in exceptional cases.
729 */
730 struct zap_details {
731 struct vm_area_struct *nonlinear_vma; /* Check page->index if set */
732 struct address_space *check_mapping; /* Check page->mapping if set */
733 pgoff_t first_index; /* Lowest page->index to unmap */
734 pgoff_t last_index; /* Highest page->index to unmap */
735 spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */
736 unsigned long truncate_count; /* Compare vm_truncate_count */
737 };
738
739 struct page *vm_normal_page(struct vm_area_struct *, unsigned long, pte_t);
740 unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
741 unsigned long size, struct zap_details *);
742 unsigned long unmap_vmas(struct mmu_gather **tlb,
743 struct vm_area_struct *start_vma, unsigned long start_addr,
744 unsigned long end_addr, unsigned long *nr_accounted,
745 struct zap_details *);
746
747 /**
748 * mm_walk - callbacks for walk_page_range
749 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
750 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
751 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
752 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
753 * @pte_hole: if set, called for each hole at all levels
754 *
755 * (see walk_page_range for more details)
756 */
757 struct mm_walk {
758 int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, void *);
759 int (*pud_entry)(pud_t *, unsigned long, unsigned long, void *);
760 int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, void *);
761 int (*pte_entry)(pte_t *, unsigned long, unsigned long, void *);
762 int (*pte_hole)(unsigned long, unsigned long, void *);
763 };
764
765 int walk_page_range(const struct mm_struct *, unsigned long addr,
766 unsigned long end, const struct mm_walk *walk,
767 void *private);
768 void free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
769 unsigned long end, unsigned long floor, unsigned long ceiling);
770 void free_pgtables(struct mmu_gather **tlb, struct vm_area_struct *start_vma,
771 unsigned long floor, unsigned long ceiling);
772 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
773 struct vm_area_struct *vma);
774 void unmap_mapping_range(struct address_space *mapping,
775 loff_t const holebegin, loff_t const holelen, int even_cows);
776
777 static inline void unmap_shared_mapping_range(struct address_space *mapping,
778 loff_t const holebegin, loff_t const holelen)
779 {
780 unmap_mapping_range(mapping, holebegin, holelen, 0);
781 }
782
783 extern int vmtruncate(struct inode * inode, loff_t offset);
784 extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end);
785
786 #ifdef CONFIG_MMU
787 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
788 unsigned long address, int write_access);
789 #else
790 static inline int handle_mm_fault(struct mm_struct *mm,
791 struct vm_area_struct *vma, unsigned long address,
792 int write_access)
793 {
794 /* should never happen if there's no MMU */
795 BUG();
796 return VM_FAULT_SIGBUS;
797 }
798 #endif
799
800 extern int make_pages_present(unsigned long addr, unsigned long end);
801 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
802
803 int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start,
804 int len, int write, int force, struct page **pages, struct vm_area_struct **vmas);
805 void print_bad_pte(struct vm_area_struct *, pte_t, unsigned long);
806
807 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
808 extern void do_invalidatepage(struct page *page, unsigned long offset);
809
810 int __set_page_dirty_nobuffers(struct page *page);
811 int __set_page_dirty_no_writeback(struct page *page);
812 int redirty_page_for_writepage(struct writeback_control *wbc,
813 struct page *page);
814 int set_page_dirty(struct page *page);
815 int set_page_dirty_lock(struct page *page);
816 int clear_page_dirty_for_io(struct page *page);
817
818 extern unsigned long move_page_tables(struct vm_area_struct *vma,
819 unsigned long old_addr, struct vm_area_struct *new_vma,
820 unsigned long new_addr, unsigned long len);
821 extern unsigned long do_mremap(unsigned long addr,
822 unsigned long old_len, unsigned long new_len,
823 unsigned long flags, unsigned long new_addr);
824 extern int mprotect_fixup(struct vm_area_struct *vma,
825 struct vm_area_struct **pprev, unsigned long start,
826 unsigned long end, unsigned long newflags);
827
828 /*
829 * A callback you can register to apply pressure to ageable caches.
830 *
831 * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should
832 * look through the least-recently-used 'nr_to_scan' entries and
833 * attempt to free them up. It should return the number of objects
834 * which remain in the cache. If it returns -1, it means it cannot do
835 * any scanning at this time (eg. there is a risk of deadlock).
836 *
837 * The 'gfpmask' refers to the allocation we are currently trying to
838 * fulfil.
839 *
840 * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is
841 * querying the cache size, so a fastpath for that case is appropriate.
842 */
843 struct shrinker {
844 int (*shrink)(int nr_to_scan, gfp_t gfp_mask);
845 int seeks; /* seeks to recreate an obj */
846
847 /* These are for internal use */
848 struct list_head list;
849 long nr; /* objs pending delete */
850 };
851 #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */
852 extern void register_shrinker(struct shrinker *);
853 extern void unregister_shrinker(struct shrinker *);
854
855 int vma_wants_writenotify(struct vm_area_struct *vma);
856
857 extern pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl);
858
859 #ifdef __PAGETABLE_PUD_FOLDED
860 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
861 unsigned long address)
862 {
863 return 0;
864 }
865 #else
866 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
867 #endif
868
869 #ifdef __PAGETABLE_PMD_FOLDED
870 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
871 unsigned long address)
872 {
873 return 0;
874 }
875 #else
876 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
877 #endif
878
879 int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
880 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
881
882 /*
883 * The following ifdef needed to get the 4level-fixup.h header to work.
884 * Remove it when 4level-fixup.h has been removed.
885 */
886 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
887 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
888 {
889 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
890 NULL: pud_offset(pgd, address);
891 }
892
893 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
894 {
895 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
896 NULL: pmd_offset(pud, address);
897 }
898 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
899
900 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
901 /*
902 * We tuck a spinlock to guard each pagetable page into its struct page,
903 * at page->private, with BUILD_BUG_ON to make sure that this will not
904 * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
905 * When freeing, reset page->mapping so free_pages_check won't complain.
906 */
907 #define __pte_lockptr(page) &((page)->ptl)
908 #define pte_lock_init(_page) do { \
909 spin_lock_init(__pte_lockptr(_page)); \
910 } while (0)
911 #define pte_lock_deinit(page) ((page)->mapping = NULL)
912 #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
913 #else
914 /*
915 * We use mm->page_table_lock to guard all pagetable pages of the mm.
916 */
917 #define pte_lock_init(page) do {} while (0)
918 #define pte_lock_deinit(page) do {} while (0)
919 #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
920 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
921
922 static inline void pgtable_page_ctor(struct page *page)
923 {
924 pte_lock_init(page);
925 inc_zone_page_state(page, NR_PAGETABLE);
926 }
927
928 static inline void pgtable_page_dtor(struct page *page)
929 {
930 pte_lock_deinit(page);
931 dec_zone_page_state(page, NR_PAGETABLE);
932 }
933
934 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
935 ({ \
936 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
937 pte_t *__pte = pte_offset_map(pmd, address); \
938 *(ptlp) = __ptl; \
939 spin_lock(__ptl); \
940 __pte; \
941 })
942
943 #define pte_unmap_unlock(pte, ptl) do { \
944 spin_unlock(ptl); \
945 pte_unmap(pte); \
946 } while (0)
947
948 #define pte_alloc_map(mm, pmd, address) \
949 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
950 NULL: pte_offset_map(pmd, address))
951
952 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
953 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
954 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
955
956 #define pte_alloc_kernel(pmd, address) \
957 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
958 NULL: pte_offset_kernel(pmd, address))
959
960 extern void free_area_init(unsigned long * zones_size);
961 extern void free_area_init_node(int nid, pg_data_t *pgdat,
962 unsigned long * zones_size, unsigned long zone_start_pfn,
963 unsigned long *zholes_size);
964 #ifdef CONFIG_ARCH_POPULATES_NODE_MAP
965 /*
966 * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its
967 * zones, allocate the backing mem_map and account for memory holes in a more
968 * architecture independent manner. This is a substitute for creating the
969 * zone_sizes[] and zholes_size[] arrays and passing them to
970 * free_area_init_node()
971 *
972 * An architecture is expected to register range of page frames backed by
973 * physical memory with add_active_range() before calling
974 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
975 * usage, an architecture is expected to do something like
976 *
977 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
978 * max_highmem_pfn};
979 * for_each_valid_physical_page_range()
980 * add_active_range(node_id, start_pfn, end_pfn)
981 * free_area_init_nodes(max_zone_pfns);
982 *
983 * If the architecture guarantees that there are no holes in the ranges
984 * registered with add_active_range(), free_bootmem_active_regions()
985 * will call free_bootmem_node() for each registered physical page range.
986 * Similarly sparse_memory_present_with_active_regions() calls
987 * memory_present() for each range when SPARSEMEM is enabled.
988 *
989 * See mm/page_alloc.c for more information on each function exposed by
990 * CONFIG_ARCH_POPULATES_NODE_MAP
991 */
992 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
993 extern void add_active_range(unsigned int nid, unsigned long start_pfn,
994 unsigned long end_pfn);
995 extern void shrink_active_range(unsigned int nid, unsigned long old_end_pfn,
996 unsigned long new_end_pfn);
997 extern void push_node_boundaries(unsigned int nid, unsigned long start_pfn,
998 unsigned long end_pfn);
999 extern void remove_all_active_ranges(void);
1000 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1001 unsigned long end_pfn);
1002 extern void get_pfn_range_for_nid(unsigned int nid,
1003 unsigned long *start_pfn, unsigned long *end_pfn);
1004 extern unsigned long find_min_pfn_with_active_regions(void);
1005 extern unsigned long find_max_pfn_with_active_regions(void);
1006 extern void free_bootmem_with_active_regions(int nid,
1007 unsigned long max_low_pfn);
1008 extern void sparse_memory_present_with_active_regions(int nid);
1009 #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
1010 extern int early_pfn_to_nid(unsigned long pfn);
1011 #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
1012 #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
1013 extern void set_dma_reserve(unsigned long new_dma_reserve);
1014 extern void memmap_init_zone(unsigned long, int, unsigned long,
1015 unsigned long, enum memmap_context);
1016 extern void setup_per_zone_pages_min(void);
1017 extern void mem_init(void);
1018 extern void show_mem(void);
1019 extern void si_meminfo(struct sysinfo * val);
1020 extern void si_meminfo_node(struct sysinfo *val, int nid);
1021
1022 #ifdef CONFIG_NUMA
1023 extern void setup_per_cpu_pageset(void);
1024 #else
1025 static inline void setup_per_cpu_pageset(void) {}
1026 #endif
1027
1028 /* prio_tree.c */
1029 void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old);
1030 void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *);
1031 void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *);
1032 struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma,
1033 struct prio_tree_iter *iter);
1034
1035 #define vma_prio_tree_foreach(vma, iter, root, begin, end) \
1036 for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \
1037 (vma = vma_prio_tree_next(vma, iter)); )
1038
1039 static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
1040 struct list_head *list)
1041 {
1042 vma->shared.vm_set.parent = NULL;
1043 list_add_tail(&vma->shared.vm_set.list, list);
1044 }
1045
1046 /* mmap.c */
1047 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1048 extern void vma_adjust(struct vm_area_struct *vma, unsigned long start,
1049 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1050 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1051 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1052 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1053 struct mempolicy *);
1054 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1055 extern int split_vma(struct mm_struct *,
1056 struct vm_area_struct *, unsigned long addr, int new_below);
1057 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1058 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1059 struct rb_node **, struct rb_node *);
1060 extern void unlink_file_vma(struct vm_area_struct *);
1061 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1062 unsigned long addr, unsigned long len, pgoff_t pgoff);
1063 extern void exit_mmap(struct mm_struct *);
1064 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1065 extern int install_special_mapping(struct mm_struct *mm,
1066 unsigned long addr, unsigned long len,
1067 unsigned long flags, struct page **pages);
1068
1069 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1070
1071 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1072 unsigned long len, unsigned long prot,
1073 unsigned long flag, unsigned long pgoff);
1074 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1075 unsigned long len, unsigned long flags,
1076 unsigned int vm_flags, unsigned long pgoff,
1077 int accountable);
1078
1079 static inline unsigned long do_mmap(struct file *file, unsigned long addr,
1080 unsigned long len, unsigned long prot,
1081 unsigned long flag, unsigned long offset)
1082 {
1083 unsigned long ret = -EINVAL;
1084 if ((offset + PAGE_ALIGN(len)) < offset)
1085 goto out;
1086 if (!(offset & ~PAGE_MASK))
1087 ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);
1088 out:
1089 return ret;
1090 }
1091
1092 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1093
1094 extern unsigned long do_brk(unsigned long, unsigned long);
1095
1096 /* filemap.c */
1097 extern unsigned long page_unuse(struct page *);
1098 extern void truncate_inode_pages(struct address_space *, loff_t);
1099 extern void truncate_inode_pages_range(struct address_space *,
1100 loff_t lstart, loff_t lend);
1101
1102 /* generic vm_area_ops exported for stackable file systems */
1103 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1104
1105 /* mm/page-writeback.c */
1106 int write_one_page(struct page *page, int wait);
1107
1108 /* readahead.c */
1109 #define VM_MAX_READAHEAD 128 /* kbytes */
1110 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1111
1112 int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
1113 pgoff_t offset, unsigned long nr_to_read);
1114 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1115 pgoff_t offset, unsigned long nr_to_read);
1116
1117 void page_cache_sync_readahead(struct address_space *mapping,
1118 struct file_ra_state *ra,
1119 struct file *filp,
1120 pgoff_t offset,
1121 unsigned long size);
1122
1123 void page_cache_async_readahead(struct address_space *mapping,
1124 struct file_ra_state *ra,
1125 struct file *filp,
1126 struct page *pg,
1127 pgoff_t offset,
1128 unsigned long size);
1129
1130 unsigned long max_sane_readahead(unsigned long nr);
1131
1132 /* Do stack extension */
1133 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1134 #ifdef CONFIG_IA64
1135 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1136 #endif
1137 extern int expand_stack_downwards(struct vm_area_struct *vma,
1138 unsigned long address);
1139
1140 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1141 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1142 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1143 struct vm_area_struct **pprev);
1144
1145 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1146 NULL if none. Assume start_addr < end_addr. */
1147 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1148 {
1149 struct vm_area_struct * vma = find_vma(mm,start_addr);
1150
1151 if (vma && end_addr <= vma->vm_start)
1152 vma = NULL;
1153 return vma;
1154 }
1155
1156 static inline unsigned long vma_pages(struct vm_area_struct *vma)
1157 {
1158 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
1159 }
1160
1161 pgprot_t vm_get_page_prot(unsigned long vm_flags);
1162 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
1163 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
1164 unsigned long pfn, unsigned long size, pgprot_t);
1165 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
1166 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
1167 unsigned long pfn);
1168
1169 struct page *follow_page(struct vm_area_struct *, unsigned long address,
1170 unsigned int foll_flags);
1171 #define FOLL_WRITE 0x01 /* check pte is writable */
1172 #define FOLL_TOUCH 0x02 /* mark page accessed */
1173 #define FOLL_GET 0x04 /* do get_page on page */
1174 #define FOLL_ANON 0x08 /* give ZERO_PAGE if no pgtable */
1175
1176 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
1177 void *data);
1178 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
1179 unsigned long size, pte_fn_t fn, void *data);
1180
1181 #ifdef CONFIG_PROC_FS
1182 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
1183 #else
1184 static inline void vm_stat_account(struct mm_struct *mm,
1185 unsigned long flags, struct file *file, long pages)
1186 {
1187 }
1188 #endif /* CONFIG_PROC_FS */
1189
1190 #ifdef CONFIG_DEBUG_PAGEALLOC
1191 extern int debug_pagealloc_enabled;
1192
1193 extern void kernel_map_pages(struct page *page, int numpages, int enable);
1194
1195 static inline void enable_debug_pagealloc(void)
1196 {
1197 debug_pagealloc_enabled = 1;
1198 }
1199 #ifdef CONFIG_HIBERNATION
1200 extern bool kernel_page_present(struct page *page);
1201 #endif /* CONFIG_HIBERNATION */
1202 #else
1203 static inline void
1204 kernel_map_pages(struct page *page, int numpages, int enable) {}
1205 static inline void enable_debug_pagealloc(void)
1206 {
1207 }
1208 #ifdef CONFIG_HIBERNATION
1209 static inline bool kernel_page_present(struct page *page) { return true; }
1210 #endif /* CONFIG_HIBERNATION */
1211 #endif
1212
1213 extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
1214 #ifdef __HAVE_ARCH_GATE_AREA
1215 int in_gate_area_no_task(unsigned long addr);
1216 int in_gate_area(struct task_struct *task, unsigned long addr);
1217 #else
1218 int in_gate_area_no_task(unsigned long addr);
1219 #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
1220 #endif /* __HAVE_ARCH_GATE_AREA */
1221
1222 int drop_caches_sysctl_handler(struct ctl_table *, int, struct file *,
1223 void __user *, size_t *, loff_t *);
1224 unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask,
1225 unsigned long lru_pages);
1226 void drop_pagecache(void);
1227 void drop_slab(void);
1228
1229 #ifndef CONFIG_MMU
1230 #define randomize_va_space 0
1231 #else
1232 extern int randomize_va_space;
1233 #endif
1234
1235 const char * arch_vma_name(struct vm_area_struct *vma);
1236 void print_vma_addr(char *prefix, unsigned long rip);
1237
1238 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
1239 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
1240 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
1241 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
1242 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
1243 void *vmemmap_alloc_block(unsigned long size, int node);
1244 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
1245 int vmemmap_populate_basepages(struct page *start_page,
1246 unsigned long pages, int node);
1247 int vmemmap_populate(struct page *start_page, unsigned long pages, int node);
1248
1249 #endif /* __KERNEL__ */
1250 #endif /* _LINUX_MM_H */
1251
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