4 #include <linux/errno.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 #include <linux/range.h>
16 #include <linux/pfn.h>
22 struct writeback_control;
24 #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
25 extern unsigned long max_mapnr;
28 extern unsigned long num_physpages;
29 extern unsigned long totalram_pages;
30 extern void * high_memory;
31 extern int page_cluster;
34 extern int sysctl_legacy_va_layout;
36 #define sysctl_legacy_va_layout 0
40 #include <asm/pgtable.h>
41 #include <asm/processor.h>
43 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
45 /* to align the pointer to the (next) page boundary */
46 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
49 * Linux kernel virtual memory manager primitives.
50 * The idea being to have a "virtual" mm in the same way
51 * we have a virtual fs - giving a cleaner interface to the
52 * mm details, and allowing different kinds of memory mappings
53 * (from shared memory to executable loading to arbitrary
57 extern struct kmem_cache *vm_area_cachep;
60 extern struct rb_root nommu_region_tree;
61 extern struct rw_semaphore nommu_region_sem;
63 extern unsigned int kobjsize(const void *objp);
67 * vm_flags in vm_area_struct, see mm_types.h.
69 #define VM_READ 0x00000001 /* currently active flags */
70 #define VM_WRITE 0x00000002
71 #define VM_EXEC 0x00000004
72 #define VM_SHARED 0x00000008
74 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
75 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
76 #define VM_MAYWRITE 0x00000020
77 #define VM_MAYEXEC 0x00000040
78 #define VM_MAYSHARE 0x00000080
80 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
81 #define VM_GROWSUP 0x00000200
82 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
83 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
85 #define VM_EXECUTABLE 0x00001000
86 #define VM_LOCKED 0x00002000
87 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
89 /* Used by sys_madvise() */
90 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
91 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
93 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
94 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
95 #define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */
96 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
97 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
98 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
99 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
100 #define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
101 #define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */
102 #define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */
104 #define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */
105 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
106 #define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */
107 #define VM_PFN_AT_MMAP 0x40000000 /* PFNMAP vma that is fully mapped at mmap time */
108 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
110 /* Bits set in the VMA until the stack is in its final location */
111 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
113 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
114 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
117 #ifdef CONFIG_STACK_GROWSUP
118 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
120 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
123 #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
124 #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
125 #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
126 #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
127 #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
130 * special vmas that are non-mergable, non-mlock()able
132 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP)
135 * mapping from the currently active vm_flags protection bits (the
136 * low four bits) to a page protection mask..
138 extern pgprot_t protection_map[16];
140 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
141 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
142 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
145 * This interface is used by x86 PAT code to identify a pfn mapping that is
146 * linear over entire vma. This is to optimize PAT code that deals with
147 * marking the physical region with a particular prot. This is not for generic
148 * mm use. Note also that this check will not work if the pfn mapping is
149 * linear for a vma starting at physical address 0. In which case PAT code
150 * falls back to slow path of reserving physical range page by page.
152 static inline int is_linear_pfn_mapping(struct vm_area_struct *vma)
154 return (vma->vm_flags & VM_PFN_AT_MMAP);
157 static inline int is_pfn_mapping(struct vm_area_struct *vma)
159 return (vma->vm_flags & VM_PFNMAP);
163 * vm_fault is filled by the the pagefault handler and passed to the vma's
164 * ->fault function. The vma's ->fault is responsible for returning a bitmask
165 * of VM_FAULT_xxx flags that give details about how the fault was handled.
167 * pgoff should be used in favour of virtual_address, if possible. If pgoff
168 * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear
172 unsigned int flags; /* FAULT_FLAG_xxx flags */
173 pgoff_t pgoff; /* Logical page offset based on vma */
174 void __user *virtual_address; /* Faulting virtual address */
176 struct page *page; /* ->fault handlers should return a
177 * page here, unless VM_FAULT_NOPAGE
178 * is set (which is also implied by
184 * These are the virtual MM functions - opening of an area, closing and
185 * unmapping it (needed to keep files on disk up-to-date etc), pointer
186 * to the functions called when a no-page or a wp-page exception occurs.
188 struct vm_operations_struct {
189 void (*open)(struct vm_area_struct * area);
190 void (*close)(struct vm_area_struct * area);
191 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
193 #define HAVE_VMOP_MPROTECT
194 int (*mprotect)(struct vm_area_struct * area, unsigned int newflags);
196 /* notification that a previously read-only page is about to become
197 * writable, if an error is returned it will cause a SIGBUS */
198 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
200 /* called by access_process_vm when get_user_pages() fails, typically
201 * for use by special VMAs that can switch between memory and hardware
203 int (*access)(struct vm_area_struct *vma, unsigned long addr,
204 void *buf, int len, int write);
207 * set_policy() op must add a reference to any non-NULL @new mempolicy
208 * to hold the policy upon return. Caller should pass NULL @new to
209 * remove a policy and fall back to surrounding context--i.e. do not
210 * install a MPOL_DEFAULT policy, nor the task or system default
213 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
216 * get_policy() op must add reference [mpol_get()] to any policy at
217 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
218 * in mm/mempolicy.c will do this automatically.
219 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
220 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
221 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
222 * must return NULL--i.e., do not "fallback" to task or system default
225 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
227 int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,
228 const nodemask_t *to, unsigned long flags);
235 #define page_private(page) ((page)->private)
236 #define set_page_private(page, v) ((page)->private = (v))
239 * FIXME: take this include out, include page-flags.h in
240 * files which need it (119 of them)
242 #include <linux/page-flags.h>
245 * Methods to modify the page usage count.
247 * What counts for a page usage:
248 * - cache mapping (page->mapping)
249 * - private data (page->private)
250 * - page mapped in a task's page tables, each mapping
251 * is counted separately
253 * Also, many kernel routines increase the page count before a critical
254 * routine so they can be sure the page doesn't go away from under them.
258 * Drop a ref, return true if the refcount fell to zero (the page has no users)
260 static inline int put_page_testzero(struct page *page)
262 VM_BUG_ON(atomic_read(&page->_count) == 0);
263 return atomic_dec_and_test(&page->_count);
267 * Try to grab a ref unless the page has a refcount of zero, return false if
270 static inline int get_page_unless_zero(struct page *page)
272 return atomic_inc_not_zero(&page->_count);
275 extern int page_is_ram(unsigned long pfn);
277 /* Support for virtually mapped pages */
278 struct page *vmalloc_to_page(const void *addr);
279 unsigned long vmalloc_to_pfn(const void *addr);
282 * Determine if an address is within the vmalloc range
284 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
285 * is no special casing required.
287 static inline int is_vmalloc_addr(const void *x)
290 unsigned long addr = (unsigned long)x;
292 return addr >= VMALLOC_START && addr < VMALLOC_END;
298 extern int is_vmalloc_or_module_addr(const void *x);
300 static inline int is_vmalloc_or_module_addr(const void *x)
306 static inline struct page *compound_head(struct page *page)
308 if (unlikely(PageTail(page)))
309 return page->first_page;
313 static inline int page_count(struct page *page)
315 return atomic_read(&compound_head(page)->_count);
318 static inline void get_page(struct page *page)
320 page = compound_head(page);
321 VM_BUG_ON(atomic_read(&page->_count) == 0);
322 atomic_inc(&page->_count);
325 static inline struct page *virt_to_head_page(const void *x)
327 struct page *page = virt_to_page(x);
328 return compound_head(page);
332 * Setup the page count before being freed into the page allocator for
333 * the first time (boot or memory hotplug)
335 static inline void init_page_count(struct page *page)
337 atomic_set(&page->_count, 1);
340 void put_page(struct page *page);
341 void put_pages_list(struct list_head *pages);
343 void split_page(struct page *page, unsigned int order);
344 int split_free_page(struct page *page);
347 * Compound pages have a destructor function. Provide a
348 * prototype for that function and accessor functions.
349 * These are _only_ valid on the head of a PG_compound page.
351 typedef void compound_page_dtor(struct page *);
353 static inline void set_compound_page_dtor(struct page *page,
354 compound_page_dtor *dtor)
356 page[1].lru.next = (void *)dtor;
359 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
361 return (compound_page_dtor *)page[1].lru.next;
364 static inline int compound_order(struct page *page)
368 return (unsigned long)page[1].lru.prev;
371 static inline void set_compound_order(struct page *page, unsigned long order)
373 page[1].lru.prev = (void *)order;
377 * Multiple processes may "see" the same page. E.g. for untouched
378 * mappings of /dev/null, all processes see the same page full of
379 * zeroes, and text pages of executables and shared libraries have
380 * only one copy in memory, at most, normally.
382 * For the non-reserved pages, page_count(page) denotes a reference count.
383 * page_count() == 0 means the page is free. page->lru is then used for
384 * freelist management in the buddy allocator.
385 * page_count() > 0 means the page has been allocated.
387 * Pages are allocated by the slab allocator in order to provide memory
388 * to kmalloc and kmem_cache_alloc. In this case, the management of the
389 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
390 * unless a particular usage is carefully commented. (the responsibility of
391 * freeing the kmalloc memory is the caller's, of course).
393 * A page may be used by anyone else who does a __get_free_page().
394 * In this case, page_count still tracks the references, and should only
395 * be used through the normal accessor functions. The top bits of page->flags
396 * and page->virtual store page management information, but all other fields
397 * are unused and could be used privately, carefully. The management of this
398 * page is the responsibility of the one who allocated it, and those who have
399 * subsequently been given references to it.
401 * The other pages (we may call them "pagecache pages") are completely
402 * managed by the Linux memory manager: I/O, buffers, swapping etc.
403 * The following discussion applies only to them.
405 * A pagecache page contains an opaque `private' member, which belongs to the
406 * page's address_space. Usually, this is the address of a circular list of
407 * the page's disk buffers. PG_private must be set to tell the VM to call
408 * into the filesystem to release these pages.
410 * A page may belong to an inode's memory mapping. In this case, page->mapping
411 * is the pointer to the inode, and page->index is the file offset of the page,
412 * in units of PAGE_CACHE_SIZE.
414 * If pagecache pages are not associated with an inode, they are said to be
415 * anonymous pages. These may become associated with the swapcache, and in that
416 * case PG_swapcache is set, and page->private is an offset into the swapcache.
418 * In either case (swapcache or inode backed), the pagecache itself holds one
419 * reference to the page. Setting PG_private should also increment the
420 * refcount. The each user mapping also has a reference to the page.
422 * The pagecache pages are stored in a per-mapping radix tree, which is
423 * rooted at mapping->page_tree, and indexed by offset.
424 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
425 * lists, we instead now tag pages as dirty/writeback in the radix tree.
427 * All pagecache pages may be subject to I/O:
428 * - inode pages may need to be read from disk,
429 * - inode pages which have been modified and are MAP_SHARED may need
430 * to be written back to the inode on disk,
431 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
432 * modified may need to be swapped out to swap space and (later) to be read
437 * The zone field is never updated after free_area_init_core()
438 * sets it, so none of the operations on it need to be atomic.
443 * page->flags layout:
445 * There are three possibilities for how page->flags get
446 * laid out. The first is for the normal case, without
447 * sparsemem. The second is for sparsemem when there is
448 * plenty of space for node and section. The last is when
449 * we have run out of space and have to fall back to an
450 * alternate (slower) way of determining the node.
452 * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS |
453 * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS |
454 * classic sparse no space for node: | SECTION | ZONE | ... | FLAGS |
456 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
457 #define SECTIONS_WIDTH SECTIONS_SHIFT
459 #define SECTIONS_WIDTH 0
462 #define ZONES_WIDTH ZONES_SHIFT
464 #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS
465 #define NODES_WIDTH NODES_SHIFT
467 #ifdef CONFIG_SPARSEMEM_VMEMMAP
468 #error "Vmemmap: No space for nodes field in page flags"
470 #define NODES_WIDTH 0
473 /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */
474 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
475 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
476 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
479 * We are going to use the flags for the page to node mapping if its in
480 * there. This includes the case where there is no node, so it is implicit.
482 #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0)
483 #define NODE_NOT_IN_PAGE_FLAGS
486 #ifndef PFN_SECTION_SHIFT
487 #define PFN_SECTION_SHIFT 0
491 * Define the bit shifts to access each section. For non-existant
492 * sections we define the shift as 0; that plus a 0 mask ensures
493 * the compiler will optimise away reference to them.
495 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
496 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
497 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
499 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allcator */
500 #ifdef NODE_NOT_IN_PAGEFLAGS
501 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
502 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
503 SECTIONS_PGOFF : ZONES_PGOFF)
505 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
506 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
507 NODES_PGOFF : ZONES_PGOFF)
510 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
512 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
513 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
516 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
517 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
518 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
519 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
521 static inline enum zone_type page_zonenum(struct page *page)
523 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
527 * The identification function is only used by the buddy allocator for
528 * determining if two pages could be buddies. We are not really
529 * identifying a zone since we could be using a the section number
530 * id if we have not node id available in page flags.
531 * We guarantee only that it will return the same value for two
532 * combinable pages in a zone.
534 static inline int page_zone_id(struct page *page)
536 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
539 static inline int zone_to_nid(struct zone *zone)
548 #ifdef NODE_NOT_IN_PAGE_FLAGS
549 extern int page_to_nid(struct page *page);
551 static inline int page_to_nid(struct page *page)
553 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
557 static inline struct zone *page_zone(struct page *page)
559 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
562 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
563 static inline unsigned long page_to_section(struct page *page)
565 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
569 static inline void set_page_zone(struct page *page, enum zone_type zone)
571 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
572 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
575 static inline void set_page_node(struct page *page, unsigned long node)
577 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
578 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
581 static inline void set_page_section(struct page *page, unsigned long section)
583 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
584 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
587 static inline void set_page_links(struct page *page, enum zone_type zone,
588 unsigned long node, unsigned long pfn)
590 set_page_zone(page, zone);
591 set_page_node(page, node);
592 set_page_section(page, pfn_to_section_nr(pfn));
596 * Some inline functions in vmstat.h depend on page_zone()
598 #include <linux/vmstat.h>
600 static __always_inline void *lowmem_page_address(struct page *page)
602 return __va(PFN_PHYS(page_to_pfn(page)));
605 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
606 #define HASHED_PAGE_VIRTUAL
609 #if defined(WANT_PAGE_VIRTUAL)
610 #define page_address(page) ((page)->virtual)
611 #define set_page_address(page, address) \
613 (page)->virtual = (address); \
615 #define page_address_init() do { } while(0)
618 #if defined(HASHED_PAGE_VIRTUAL)
619 void *page_address(struct page *page);
620 void set_page_address(struct page *page, void *virtual);
621 void page_address_init(void);
624 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
625 #define page_address(page) lowmem_page_address(page)
626 #define set_page_address(page, address) do { } while(0)
627 #define page_address_init() do { } while(0)
631 * On an anonymous page mapped into a user virtual memory area,
632 * page->mapping points to its anon_vma, not to a struct address_space;
633 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
635 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
636 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
637 * and then page->mapping points, not to an anon_vma, but to a private
638 * structure which KSM associates with that merged page. See ksm.h.
640 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
642 * Please note that, confusingly, "page_mapping" refers to the inode
643 * address_space which maps the page from disk; whereas "page_mapped"
644 * refers to user virtual address space into which the page is mapped.
646 #define PAGE_MAPPING_ANON 1
647 #define PAGE_MAPPING_KSM 2
648 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
650 extern struct address_space swapper_space;
651 static inline struct address_space *page_mapping(struct page *page)
653 struct address_space *mapping = page->mapping;
655 VM_BUG_ON(PageSlab(page));
656 if (unlikely(PageSwapCache(page)))
657 mapping = &swapper_space;
658 else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
663 /* Neutral page->mapping pointer to address_space or anon_vma or other */
664 static inline void *page_rmapping(struct page *page)
666 return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
669 extern struct address_space *__page_file_mapping(struct page *);
672 struct address_space *page_file_mapping(struct page *page)
674 if (unlikely(PageSwapCache(page)))
675 return __page_file_mapping(page);
677 return page->mapping;
680 static inline int PageAnon(struct page *page)
682 return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
686 * Return the pagecache index of the passed page. Regular pagecache pages
687 * use ->index whereas swapcache pages use ->private
689 static inline pgoff_t page_index(struct page *page)
691 if (unlikely(PageSwapCache(page)))
692 return page_private(page);
696 extern pgoff_t __page_file_index(struct page *page);
699 * Return the file index of the page. Regular pagecache pages use ->index
700 * whereas swapcache pages use swp_offset(->private)
702 static inline pgoff_t page_file_index(struct page *page)
704 if (unlikely(PageSwapCache(page)))
705 return __page_file_index(page);
711 * The atomic page->_mapcount, like _count, starts from -1:
712 * so that transitions both from it and to it can be tracked,
713 * using atomic_inc_and_test and atomic_add_negative(-1).
715 static inline void reset_page_mapcount(struct page *page)
717 atomic_set(&(page)->_mapcount, -1);
720 static inline int page_mapcount(struct page *page)
722 return atomic_read(&(page)->_mapcount) + 1;
726 * Return true if this page is mapped into pagetables.
728 static inline int page_mapped(struct page *page)
730 return atomic_read(&(page)->_mapcount) >= 0;
734 * Different kinds of faults, as returned by handle_mm_fault().
735 * Used to decide whether a process gets delivered SIGBUS or
736 * just gets major/minor fault counters bumped up.
739 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
741 #define VM_FAULT_OOM 0x0001
742 #define VM_FAULT_SIGBUS 0x0002
743 #define VM_FAULT_MAJOR 0x0004
744 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
745 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned page */
747 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
748 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
750 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON)
753 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
755 extern void pagefault_out_of_memory(void);
757 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
759 extern void show_free_areas(void);
761 int shmem_lock(struct file *file, int lock, struct user_struct *user);
762 struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags);
763 int shmem_zero_setup(struct vm_area_struct *);
766 extern unsigned long shmem_get_unmapped_area(struct file *file,
770 unsigned long flags);
773 extern int can_do_mlock(void);
774 extern int user_shm_lock(size_t, struct user_struct *);
775 extern void user_shm_unlock(size_t, struct user_struct *);
778 * Parameter block passed down to zap_pte_range in exceptional cases.
781 struct vm_area_struct *nonlinear_vma; /* Check page->index if set */
782 struct address_space *check_mapping; /* Check page->mapping if set */
783 pgoff_t first_index; /* Lowest page->index to unmap */
784 pgoff_t last_index; /* Highest page->index to unmap */
785 spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */
786 unsigned long truncate_count; /* Compare vm_truncate_count */
789 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
792 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
794 unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
795 unsigned long size, struct zap_details *);
796 unsigned long unmap_vmas(struct mmu_gather **tlb,
797 struct vm_area_struct *start_vma, unsigned long start_addr,
798 unsigned long end_addr, unsigned long *nr_accounted,
799 struct zap_details *);
802 * mm_walk - callbacks for walk_page_range
803 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
804 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
805 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
806 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
807 * @pte_hole: if set, called for each hole at all levels
808 * @hugetlb_entry: if set, called for each hugetlb entry
810 * (see walk_page_range for more details)
813 int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *);
814 int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *);
815 int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *);
816 int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *);
817 int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *);
818 int (*hugetlb_entry)(pte_t *, unsigned long,
819 unsigned long, unsigned long, struct mm_walk *);
820 struct mm_struct *mm;
824 int walk_page_range(unsigned long addr, unsigned long end,
825 struct mm_walk *walk);
826 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
827 unsigned long end, unsigned long floor, unsigned long ceiling);
828 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
829 struct vm_area_struct *vma);
830 int zeromap_page_range(struct vm_area_struct *vma, unsigned long from,
831 unsigned long size, pgprot_t prot);
832 void unmap_mapping_range(struct address_space *mapping,
833 loff_t const holebegin, loff_t const holelen, int even_cows);
834 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
836 int follow_phys(struct vm_area_struct *vma, unsigned long address,
837 unsigned int flags, unsigned long *prot, resource_size_t *phys);
838 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
839 void *buf, int len, int write);
841 static inline void unmap_shared_mapping_range(struct address_space *mapping,
842 loff_t const holebegin, loff_t const holelen)
844 unmap_mapping_range(mapping, holebegin, holelen, 0);
847 extern void truncate_pagecache(struct inode *inode, loff_t old, loff_t new);
848 extern int vmtruncate(struct inode *inode, loff_t offset);
849 extern int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end);
851 int truncate_inode_page(struct address_space *mapping, struct page *page);
852 int generic_error_remove_page(struct address_space *mapping, struct page *page);
854 int invalidate_inode_page(struct page *page);
857 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
858 unsigned long address, unsigned int flags);
860 static inline int handle_mm_fault(struct mm_struct *mm,
861 struct vm_area_struct *vma, unsigned long address,
864 /* should never happen if there's no MMU */
866 return VM_FAULT_SIGBUS;
870 extern int make_pages_present(unsigned long addr, unsigned long end);
871 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
873 int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
874 unsigned long start, int nr_pages, int write, int force,
875 struct page **pages, struct vm_area_struct **vmas);
876 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
877 struct page **pages);
878 struct page *get_dump_page(unsigned long addr);
880 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
881 extern void do_invalidatepage(struct page *page, unsigned long offset);
883 int __set_page_dirty_nobuffers(struct page *page);
884 int __set_page_dirty_no_writeback(struct page *page);
885 int redirty_page_for_writepage(struct writeback_control *wbc,
887 void account_page_dirtied(struct page *page, struct address_space *mapping);
888 int set_page_dirty(struct page *page);
889 int set_page_dirty_lock(struct page *page);
890 int set_page_dirty_notag(struct page *page);
891 int clear_page_dirty_for_io(struct page *page);
893 extern unsigned long move_page_tables(struct vm_area_struct *vma,
894 unsigned long old_addr, struct vm_area_struct *new_vma,
895 unsigned long new_addr, unsigned long len);
896 extern unsigned long do_mremap(unsigned long addr,
897 unsigned long old_len, unsigned long new_len,
898 unsigned long flags, unsigned long new_addr);
899 extern int mprotect_fixup(struct vm_area_struct *vma,
900 struct vm_area_struct **pprev, unsigned long start,
901 unsigned long end, unsigned long newflags);
904 * doesn't attempt to fault and will return short.
906 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
907 struct page **pages);
909 * per-process(per-mm_struct) statistics.
911 #if defined(SPLIT_RSS_COUNTING)
913 * The mm counters are not protected by its page_table_lock,
914 * so must be incremented atomically.
916 static inline void set_mm_counter(struct mm_struct *mm, int member, long value)
918 atomic_long_set(&mm->rss_stat.count[member], value);
921 unsigned long get_mm_counter(struct mm_struct *mm, int member);
923 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
925 atomic_long_add(value, &mm->rss_stat.count[member]);
928 static inline void inc_mm_counter(struct mm_struct *mm, int member)
930 atomic_long_inc(&mm->rss_stat.count[member]);
933 static inline void dec_mm_counter(struct mm_struct *mm, int member)
935 atomic_long_dec(&mm->rss_stat.count[member]);
938 #else /* !USE_SPLIT_PTLOCKS */
940 * The mm counters are protected by its page_table_lock,
941 * so can be incremented directly.
943 static inline void set_mm_counter(struct mm_struct *mm, int member, long value)
945 mm->rss_stat.count[member] = value;
948 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
950 return mm->rss_stat.count[member];
953 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
955 mm->rss_stat.count[member] += value;
958 static inline void inc_mm_counter(struct mm_struct *mm, int member)
960 mm->rss_stat.count[member]++;
963 static inline void dec_mm_counter(struct mm_struct *mm, int member)
965 mm->rss_stat.count[member]--;
968 #endif /* !USE_SPLIT_PTLOCKS */
970 static inline unsigned long get_mm_rss(struct mm_struct *mm)
972 return get_mm_counter(mm, MM_FILEPAGES) +
973 get_mm_counter(mm, MM_ANONPAGES);
976 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
978 return max(mm->hiwater_rss, get_mm_rss(mm));
981 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
983 return max(mm->hiwater_vm, mm->total_vm);
986 static inline void update_hiwater_rss(struct mm_struct *mm)
988 unsigned long _rss = get_mm_rss(mm);
990 if ((mm)->hiwater_rss < _rss)
991 (mm)->hiwater_rss = _rss;
994 static inline void update_hiwater_vm(struct mm_struct *mm)
996 if (mm->hiwater_vm < mm->total_vm)
997 mm->hiwater_vm = mm->total_vm;
1000 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1001 struct mm_struct *mm)
1003 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1005 if (*maxrss < hiwater_rss)
1006 *maxrss = hiwater_rss;
1009 #if defined(SPLIT_RSS_COUNTING)
1010 void sync_mm_rss(struct task_struct *task, struct mm_struct *mm);
1012 static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
1018 * A callback you can register to apply pressure to ageable caches.
1020 * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should
1021 * look through the least-recently-used 'nr_to_scan' entries and
1022 * attempt to free them up. It should return the number of objects
1023 * which remain in the cache. If it returns -1, it means it cannot do
1024 * any scanning at this time (eg. there is a risk of deadlock).
1026 * The 'gfpmask' refers to the allocation we are currently trying to
1029 * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is
1030 * querying the cache size, so a fastpath for that case is appropriate.
1033 int (*shrink)(int nr_to_scan, gfp_t gfp_mask);
1034 int seeks; /* seeks to recreate an obj */
1036 /* These are for internal use */
1037 struct list_head list;
1038 long nr; /* objs pending delete */
1040 #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */
1041 extern void register_shrinker(struct shrinker *);
1042 extern void unregister_shrinker(struct shrinker *);
1044 int vma_wants_writenotify(struct vm_area_struct *vma);
1046 extern pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl);
1048 #ifdef __PAGETABLE_PUD_FOLDED
1049 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1050 unsigned long address)
1055 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1058 #ifdef __PAGETABLE_PMD_FOLDED
1059 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1060 unsigned long address)
1065 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1068 int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
1069 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1072 * The following ifdef needed to get the 4level-fixup.h header to work.
1073 * Remove it when 4level-fixup.h has been removed.
1075 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1076 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1078 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1079 NULL: pud_offset(pgd, address);
1082 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1084 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1085 NULL: pmd_offset(pud, address);
1087 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1089 #if USE_SPLIT_PTLOCKS
1091 * We tuck a spinlock to guard each pagetable page into its struct page,
1092 * at page->private, with BUILD_BUG_ON to make sure that this will not
1093 * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
1094 * When freeing, reset page->mapping so free_pages_check won't complain.
1096 #define __pte_lockptr(page) &((page)->ptl)
1097 #define pte_lock_init(_page) do { \
1098 spin_lock_init(__pte_lockptr(_page)); \
1100 #define pte_lock_deinit(page) ((page)->mapping = NULL)
1101 #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
1102 #else /* !USE_SPLIT_PTLOCKS */
1104 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1106 #define pte_lock_init(page) do {} while (0)
1107 #define pte_lock_deinit(page) do {} while (0)
1108 #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
1109 #endif /* USE_SPLIT_PTLOCKS */
1111 static inline void pgtable_page_ctor(struct page *page)
1113 pte_lock_init(page);
1114 inc_zone_page_state(page, NR_PAGETABLE);
1117 static inline void pgtable_page_dtor(struct page *page)
1119 pte_lock_deinit(page);
1120 dec_zone_page_state(page, NR_PAGETABLE);
1123 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1125 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1126 pte_t *__pte = pte_offset_map(pmd, address); \
1132 #define pte_unmap_unlock(pte, ptl) do { \
1137 #define pte_alloc_map(mm, pmd, address) \
1138 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
1139 NULL: pte_offset_map(pmd, address))
1141 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1142 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
1143 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1145 #define pte_alloc_kernel(pmd, address) \
1146 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1147 NULL: pte_offset_kernel(pmd, address))
1149 extern void free_area_init(unsigned long * zones_size);
1150 extern void free_area_init_node(int nid, unsigned long * zones_size,
1151 unsigned long zone_start_pfn, unsigned long *zholes_size);
1152 #ifdef CONFIG_ARCH_POPULATES_NODE_MAP
1154 * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its
1155 * zones, allocate the backing mem_map and account for memory holes in a more
1156 * architecture independent manner. This is a substitute for creating the
1157 * zone_sizes[] and zholes_size[] arrays and passing them to
1158 * free_area_init_node()
1160 * An architecture is expected to register range of page frames backed by
1161 * physical memory with add_active_range() before calling
1162 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1163 * usage, an architecture is expected to do something like
1165 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1167 * for_each_valid_physical_page_range()
1168 * add_active_range(node_id, start_pfn, end_pfn)
1169 * free_area_init_nodes(max_zone_pfns);
1171 * If the architecture guarantees that there are no holes in the ranges
1172 * registered with add_active_range(), free_bootmem_active_regions()
1173 * will call free_bootmem_node() for each registered physical page range.
1174 * Similarly sparse_memory_present_with_active_regions() calls
1175 * memory_present() for each range when SPARSEMEM is enabled.
1177 * See mm/page_alloc.c for more information on each function exposed by
1178 * CONFIG_ARCH_POPULATES_NODE_MAP
1180 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1181 extern void add_active_range(unsigned int nid, unsigned long start_pfn,
1182 unsigned long end_pfn);
1183 extern void remove_active_range(unsigned int nid, unsigned long start_pfn,
1184 unsigned long end_pfn);
1185 extern void remove_all_active_ranges(void);
1186 void sort_node_map(void);
1187 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1188 unsigned long end_pfn);
1189 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1190 unsigned long end_pfn);
1191 extern void get_pfn_range_for_nid(unsigned int nid,
1192 unsigned long *start_pfn, unsigned long *end_pfn);
1193 extern unsigned long find_min_pfn_with_active_regions(void);
1194 extern void free_bootmem_with_active_regions(int nid,
1195 unsigned long max_low_pfn);
1196 int add_from_early_node_map(struct range *range, int az,
1197 int nr_range, int nid);
1198 void *__alloc_memory_core_early(int nodeid, u64 size, u64 align,
1199 u64 goal, u64 limit);
1200 typedef int (*work_fn_t)(unsigned long, unsigned long, void *);
1201 extern void work_with_active_regions(int nid, work_fn_t work_fn, void *data);
1202 extern void sparse_memory_present_with_active_regions(int nid);
1203 #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
1205 #if !defined(CONFIG_ARCH_POPULATES_NODE_MAP) && \
1206 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1207 static inline int __early_pfn_to_nid(unsigned long pfn)
1212 /* please see mm/page_alloc.c */
1213 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1214 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
1215 /* there is a per-arch backend function. */
1216 extern int __meminit __early_pfn_to_nid(unsigned long pfn);
1217 #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
1220 extern void set_dma_reserve(unsigned long new_dma_reserve);
1221 extern void memmap_init_zone(unsigned long, int, unsigned long,
1222 unsigned long, enum memmap_context);
1223 extern void setup_per_zone_wmarks(void);
1224 extern void calculate_zone_inactive_ratio(struct zone *zone);
1225 extern void mem_init(void);
1226 extern void __init mmap_init(void);
1227 extern void show_mem(void);
1228 extern void si_meminfo(struct sysinfo * val);
1229 extern void si_meminfo_node(struct sysinfo *val, int nid);
1230 extern int after_bootmem;
1232 extern void setup_per_cpu_pageset(void);
1234 extern void zone_pcp_update(struct zone *zone);
1237 extern atomic_long_t mmap_pages_allocated;
1238 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1241 void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old);
1242 void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *);
1243 void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *);
1244 struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma,
1245 struct prio_tree_iter *iter);
1247 #define vma_prio_tree_foreach(vma, iter, root, begin, end) \
1248 for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \
1249 (vma = vma_prio_tree_next(vma, iter)); )
1251 static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
1252 struct list_head *list)
1254 vma->shared.vm_set.parent = NULL;
1255 list_add_tail(&vma->shared.vm_set.list, list);
1259 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1260 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1261 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1262 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1263 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1264 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1265 struct mempolicy *);
1266 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1267 extern int split_vma(struct mm_struct *,
1268 struct vm_area_struct *, unsigned long addr, int new_below);
1269 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1270 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1271 struct rb_node **, struct rb_node *);
1272 extern void unlink_file_vma(struct vm_area_struct *);
1273 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1274 unsigned long addr, unsigned long len, pgoff_t pgoff);
1275 extern void exit_mmap(struct mm_struct *);
1277 extern int mm_take_all_locks(struct mm_struct *mm);
1278 extern void mm_drop_all_locks(struct mm_struct *mm);
1280 #ifdef CONFIG_PROC_FS
1281 /* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */
1282 extern void added_exe_file_vma(struct mm_struct *mm);
1283 extern void removed_exe_file_vma(struct mm_struct *mm);
1285 static inline void added_exe_file_vma(struct mm_struct *mm)
1288 static inline void removed_exe_file_vma(struct mm_struct *mm)
1290 #endif /* CONFIG_PROC_FS */
1292 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1293 extern int install_special_mapping(struct mm_struct *mm,
1294 unsigned long addr, unsigned long len,
1295 unsigned long flags, struct page **pages);
1297 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1299 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1300 unsigned long len, unsigned long prot,
1301 unsigned long flag, unsigned long pgoff);
1302 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1303 unsigned long len, unsigned long flags,
1304 unsigned int vm_flags, unsigned long pgoff);
1306 static inline unsigned long do_mmap(struct file *file, unsigned long addr,
1307 unsigned long len, unsigned long prot,
1308 unsigned long flag, unsigned long offset)
1310 unsigned long ret = -EINVAL;
1311 if ((offset + PAGE_ALIGN(len)) < offset)
1313 if (!(offset & ~PAGE_MASK))
1314 ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);
1319 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1321 extern unsigned long do_brk(unsigned long, unsigned long);
1324 extern unsigned long page_unuse(struct page *);
1325 extern void truncate_inode_pages(struct address_space *, loff_t);
1326 extern void truncate_inode_pages_range(struct address_space *,
1327 loff_t lstart, loff_t lend);
1329 /* generic vm_area_ops exported for stackable file systems */
1330 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1332 /* mm/page-writeback.c */
1333 int write_one_page(struct page *page, int wait);
1334 void task_dirty_inc(struct task_struct *tsk);
1337 #ifndef CONFIG_KERNEL_DESKTOP
1338 #define VM_MAX_READAHEAD 512 /* kbytes */
1340 #define VM_MAX_READAHEAD 128 /* kbytes */
1342 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1344 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1345 pgoff_t offset, unsigned long nr_to_read);
1347 void page_cache_sync_readahead(struct address_space *mapping,
1348 struct file_ra_state *ra,
1351 unsigned long size);
1353 void page_cache_async_readahead(struct address_space *mapping,
1354 struct file_ra_state *ra,
1358 unsigned long size);
1360 unsigned long max_sane_readahead(unsigned long nr);
1361 unsigned long ra_submit(struct file_ra_state *ra,
1362 struct address_space *mapping,
1365 /* Do stack extension */
1366 extern int heap_stack_gap;
1367 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1369 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1371 extern int expand_stack_downwards(struct vm_area_struct *vma,
1372 unsigned long address);
1374 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1375 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1376 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1377 struct vm_area_struct **pprev);
1379 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1380 NULL if none. Assume start_addr < end_addr. */
1381 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1383 struct vm_area_struct * vma = find_vma(mm,start_addr);
1385 if (vma && end_addr <= vma->vm_start)
1390 static inline unsigned long vma_pages(struct vm_area_struct *vma)
1392 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
1395 pgprot_t vm_get_page_prot(unsigned long vm_flags);
1396 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
1397 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
1398 unsigned long pfn, unsigned long size, pgprot_t);
1399 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
1400 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
1402 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
1405 struct page *follow_page(struct vm_area_struct *, unsigned long address,
1406 unsigned int foll_flags);
1407 #define FOLL_WRITE 0x01 /* check pte is writable */
1408 #define FOLL_TOUCH 0x02 /* mark page accessed */
1409 #define FOLL_GET 0x04 /* do get_page on page */
1410 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1411 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1413 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
1415 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
1416 unsigned long size, pte_fn_t fn, void *data);
1418 #ifdef CONFIG_PROC_FS
1419 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
1421 static inline void vm_stat_account(struct mm_struct *mm,
1422 unsigned long flags, struct file *file, long pages)
1425 #endif /* CONFIG_PROC_FS */
1427 #ifdef CONFIG_DEBUG_PAGEALLOC
1428 extern int debug_pagealloc_enabled;
1430 extern void kernel_map_pages(struct page *page, int numpages, int enable);
1432 static inline void enable_debug_pagealloc(void)
1434 debug_pagealloc_enabled = 1;
1436 #ifdef CONFIG_HIBERNATION
1437 extern bool kernel_page_present(struct page *page);
1438 #endif /* CONFIG_HIBERNATION */
1441 kernel_map_pages(struct page *page, int numpages, int enable) {}
1442 static inline void enable_debug_pagealloc(void)
1445 #ifdef CONFIG_HIBERNATION
1446 static inline bool kernel_page_present(struct page *page) { return true; }
1447 #endif /* CONFIG_HIBERNATION */
1450 extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
1451 #ifdef __HAVE_ARCH_GATE_AREA
1452 int in_gate_area_no_task(unsigned long addr);
1453 int in_gate_area(struct task_struct *task, unsigned long addr);
1455 int in_gate_area_no_task(unsigned long addr);
1456 #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
1457 #endif /* __HAVE_ARCH_GATE_AREA */
1459 int drop_caches_sysctl_handler(struct ctl_table *, int,
1460 void __user *, size_t *, loff_t *);
1461 unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask,
1462 unsigned long lru_pages);
1465 #define randomize_va_space 0
1467 extern int randomize_va_space;
1470 const char * arch_vma_name(struct vm_area_struct *vma);
1471 void print_vma_addr(char *prefix, unsigned long rip);
1473 void sparse_mem_maps_populate_node(struct page **map_map,
1474 unsigned long pnum_begin,
1475 unsigned long pnum_end,
1476 unsigned long map_count,
1479 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
1480 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
1481 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
1482 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
1483 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
1484 void *vmemmap_alloc_block(unsigned long size, int node);
1485 void *vmemmap_alloc_block_buf(unsigned long size, int node);
1486 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
1487 int vmemmap_populate_basepages(struct page *start_page,
1488 unsigned long pages, int node);
1489 int vmemmap_populate(struct page *start_page, unsigned long pages, int node);
1490 void vmemmap_populate_print_last(void);
1494 MF_COUNT_INCREASED = 1 << 0,
1496 extern void memory_failure(unsigned long pfn, int trapno);
1497 extern int __memory_failure(unsigned long pfn, int trapno, int flags);
1498 extern int unpoison_memory(unsigned long pfn);
1499 extern int sysctl_memory_failure_early_kill;
1500 extern int sysctl_memory_failure_recovery;
1501 extern void shake_page(struct page *p, int access);
1502 extern atomic_long_t mce_bad_pages;
1503 extern int soft_offline_page(struct page *page, int flags);
1505 extern void dump_page(struct page *page);
1507 #endif /* __KERNEL__ */
1508 #endif /* _LINUX_MM_H */