4 #include <linux/sched.h>
5 #include <linux/errno.h>
6 #include <linux/capability.h>
10 #include <linux/gfp.h>
11 #include <linux/list.h>
12 #include <linux/mmzone.h>
13 #include <linux/rbtree.h>
14 #include <linux/prio_tree.h>
16 #include <linux/mutex.h>
17 #include <linux/debug_locks.h>
22 #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
23 extern unsigned long max_mapnr
;
26 extern unsigned long num_physpages
;
27 extern void * high_memory
;
28 extern unsigned long vmalloc_earlyreserve
;
29 extern int page_cluster
;
32 extern int sysctl_legacy_va_layout
;
34 #define sysctl_legacy_va_layout 0
38 #include <asm/pgtable.h>
39 #include <asm/processor.h>
41 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
44 * Linux kernel virtual memory manager primitives.
45 * The idea being to have a "virtual" mm in the same way
46 * we have a virtual fs - giving a cleaner interface to the
47 * mm details, and allowing different kinds of memory mappings
48 * (from shared memory to executable loading to arbitrary
53 * This struct defines a memory VMM memory area. There is one of these
54 * per VM-area/task. A VM area is any part of the process virtual memory
55 * space that has a special rule for the page-fault handlers (ie a shared
56 * library, the executable area etc).
58 struct vm_area_struct
{
59 struct mm_struct
* vm_mm
; /* The address space we belong to. */
60 unsigned long vm_start
; /* Our start address within vm_mm. */
61 unsigned long vm_end
; /* The first byte after our end address
64 /* linked list of VM areas per task, sorted by address */
65 struct vm_area_struct
*vm_next
;
67 pgprot_t vm_page_prot
; /* Access permissions of this VMA. */
68 unsigned long vm_flags
; /* Flags, listed below. */
73 * For areas with an address space and backing store,
74 * linkage into the address_space->i_mmap prio tree, or
75 * linkage to the list of like vmas hanging off its node, or
76 * linkage of vma in the address_space->i_mmap_nonlinear list.
80 struct list_head list
;
81 void *parent
; /* aligns with prio_tree_node parent */
82 struct vm_area_struct
*head
;
85 struct raw_prio_tree_node prio_tree_node
;
89 * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
90 * list, after a COW of one of the file pages. A MAP_SHARED vma
91 * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
92 * or brk vma (with NULL file) can only be in an anon_vma list.
94 struct list_head anon_vma_node
; /* Serialized by anon_vma->lock */
95 struct anon_vma
*anon_vma
; /* Serialized by page_table_lock */
97 /* Function pointers to deal with this struct. */
98 struct vm_operations_struct
* vm_ops
;
100 /* Information about our backing store: */
101 unsigned long vm_pgoff
; /* Offset (within vm_file) in PAGE_SIZE
102 units, *not* PAGE_CACHE_SIZE */
103 struct file
* vm_file
; /* File we map to (can be NULL). */
104 void * vm_private_data
; /* was vm_pte (shared mem) */
105 unsigned long vm_truncate_count
;/* truncate_count or restart_addr */
108 atomic_t vm_usage
; /* refcount (VMAs shared if !MMU) */
111 struct mempolicy
*vm_policy
; /* NUMA policy for the VMA */
116 * This struct defines the per-mm list of VMAs for uClinux. If CONFIG_MMU is
117 * disabled, then there's a single shared list of VMAs maintained by the
118 * system, and mm's subscribe to these individually
120 struct vm_list_struct
{
121 struct vm_list_struct
*next
;
122 struct vm_area_struct
*vma
;
126 extern struct rb_root nommu_vma_tree
;
127 extern struct rw_semaphore nommu_vma_sem
;
129 extern unsigned int kobjsize(const void *objp
);
135 #define VM_READ 0x00000001 /* currently active flags */
136 #define VM_WRITE 0x00000002
137 #define VM_EXEC 0x00000004
138 #define VM_SHARED 0x00000008
140 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
141 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
142 #define VM_MAYWRITE 0x00000020
143 #define VM_MAYEXEC 0x00000040
144 #define VM_MAYSHARE 0x00000080
146 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
147 #define VM_GROWSUP 0x00000200
148 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
149 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
151 #define VM_EXECUTABLE 0x00001000
152 #define VM_LOCKED 0x00002000
153 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
155 /* Used by sys_madvise() */
156 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
157 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
159 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
160 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
161 #define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */
162 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
163 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
164 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
165 #define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
166 #define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */
168 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
169 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
172 #ifdef CONFIG_STACK_GROWSUP
173 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
175 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
178 #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
179 #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
180 #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
181 #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
182 #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
185 * mapping from the currently active vm_flags protection bits (the
186 * low four bits) to a page protection mask..
188 extern pgprot_t protection_map
[16];
192 * These are the virtual MM functions - opening of an area, closing and
193 * unmapping it (needed to keep files on disk up-to-date etc), pointer
194 * to the functions called when a no-page or a wp-page exception occurs.
196 struct vm_operations_struct
{
197 void (*open
)(struct vm_area_struct
* area
);
198 void (*close
)(struct vm_area_struct
* area
);
199 struct page
* (*nopage
)(struct vm_area_struct
* area
, unsigned long address
, int *type
);
200 int (*populate
)(struct vm_area_struct
* area
, unsigned long address
, unsigned long len
, pgprot_t prot
, unsigned long pgoff
, int nonblock
);
202 /* notification that a previously read-only page is about to become
203 * writable, if an error is returned it will cause a SIGBUS */
204 int (*page_mkwrite
)(struct vm_area_struct
*vma
, struct page
*page
);
206 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
207 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
209 int (*migrate
)(struct vm_area_struct
*vma
, const nodemask_t
*from
,
210 const nodemask_t
*to
, unsigned long flags
);
218 * Each physical page in the system has a struct page associated with
219 * it to keep track of whatever it is we are using the page for at the
220 * moment. Note that we have no way to track which tasks are using
224 unsigned long flags
; /* Atomic flags, some possibly
225 * updated asynchronously */
226 atomic_t _count
; /* Usage count, see below. */
227 atomic_t _mapcount
; /* Count of ptes mapped in mms,
228 * to show when page is mapped
229 * & limit reverse map searches.
233 unsigned long private; /* Mapping-private opaque data:
234 * usually used for buffer_heads
235 * if PagePrivate set; used for
236 * swp_entry_t if PageSwapCache;
237 * indicates order in the buddy
238 * system if PG_buddy is set.
240 struct address_space
*mapping
; /* If low bit clear, points to
241 * inode address_space, or NULL.
242 * If page mapped as anonymous
243 * memory, low bit is set, and
244 * it points to anon_vma object:
245 * see PAGE_MAPPING_ANON below.
248 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
252 pgoff_t index
; /* Our offset within mapping. */
253 struct list_head lru
; /* Pageout list, eg. active_list
254 * protected by zone->lru_lock !
257 * On machines where all RAM is mapped into kernel address space,
258 * we can simply calculate the virtual address. On machines with
259 * highmem some memory is mapped into kernel virtual memory
260 * dynamically, so we need a place to store that address.
261 * Note that this field could be 16 bits on x86 ... ;)
263 * Architectures with slow multiplication can define
264 * WANT_PAGE_VIRTUAL in asm/page.h
266 #if defined(WANT_PAGE_VIRTUAL)
267 void *virtual; /* Kernel virtual address (NULL if
268 not kmapped, ie. highmem) */
269 #endif /* WANT_PAGE_VIRTUAL */
272 #define page_private(page) ((page)->private)
273 #define set_page_private(page, v) ((page)->private = (v))
276 * FIXME: take this include out, include page-flags.h in
277 * files which need it (119 of them)
279 #include <linux/page-flags.h>
281 #ifdef CONFIG_DEBUG_VM
282 #define VM_BUG_ON(cond) BUG_ON(cond)
284 #define VM_BUG_ON(condition) do { } while(0)
288 * Methods to modify the page usage count.
290 * What counts for a page usage:
291 * - cache mapping (page->mapping)
292 * - private data (page->private)
293 * - page mapped in a task's page tables, each mapping
294 * is counted separately
296 * Also, many kernel routines increase the page count before a critical
297 * routine so they can be sure the page doesn't go away from under them.
301 * Drop a ref, return true if the logical refcount fell to zero (the page has
304 static inline int put_page_testzero(struct page
*page
)
306 VM_BUG_ON(atomic_read(&page
->_count
) == 0);
307 return atomic_dec_and_test(&page
->_count
);
311 * Try to grab a ref unless the page has a refcount of zero, return false if
314 static inline int get_page_unless_zero(struct page
*page
)
316 VM_BUG_ON(PageCompound(page
));
317 return atomic_inc_not_zero(&page
->_count
);
320 extern void FASTCALL(__page_cache_release(struct page
*));
322 static inline int page_count(struct page
*page
)
324 if (unlikely(PageCompound(page
)))
325 page
= (struct page
*)page_private(page
);
326 return atomic_read(&page
->_count
);
329 static inline void get_page(struct page
*page
)
331 if (unlikely(PageCompound(page
)))
332 page
= (struct page
*)page_private(page
);
333 VM_BUG_ON(atomic_read(&page
->_count
) == 0);
334 atomic_inc(&page
->_count
);
338 * Setup the page count before being freed into the page allocator for
339 * the first time (boot or memory hotplug)
341 static inline void init_page_count(struct page
*page
)
343 atomic_set(&page
->_count
, 1);
346 void put_page(struct page
*page
);
347 void put_pages_list(struct list_head
*pages
);
349 void split_page(struct page
*page
, unsigned int order
);
352 * Multiple processes may "see" the same page. E.g. for untouched
353 * mappings of /dev/null, all processes see the same page full of
354 * zeroes, and text pages of executables and shared libraries have
355 * only one copy in memory, at most, normally.
357 * For the non-reserved pages, page_count(page) denotes a reference count.
358 * page_count() == 0 means the page is free. page->lru is then used for
359 * freelist management in the buddy allocator.
360 * page_count() == 1 means the page is used for exactly one purpose
361 * (e.g. a private data page of one process).
363 * A page may be used for kmalloc() or anyone else who does a
364 * __get_free_page(). In this case the page_count() is at least 1, and
365 * all other fields are unused but should be 0 or NULL. The
366 * management of this page is the responsibility of the one who uses
369 * The other pages (we may call them "process pages") are completely
370 * managed by the Linux memory manager: I/O, buffers, swapping etc.
371 * The following discussion applies only to them.
373 * A page may belong to an inode's memory mapping. In this case,
374 * page->mapping is the pointer to the inode, and page->index is the
375 * file offset of the page, in units of PAGE_CACHE_SIZE.
377 * A page contains an opaque `private' member, which belongs to the
378 * page's address_space. Usually, this is the address of a circular
379 * list of the page's disk buffers.
381 * For pages belonging to inodes, the page_count() is the number of
382 * attaches, plus 1 if `private' contains something, plus one for
383 * the page cache itself.
385 * Instead of keeping dirty/clean pages in per address-space lists, we instead
386 * now tag pages as dirty/under writeback in the radix tree.
388 * There is also a per-mapping radix tree mapping index to the page
389 * in memory if present. The tree is rooted at mapping->root.
391 * All process pages can do I/O:
392 * - inode pages may need to be read from disk,
393 * - inode pages which have been modified and are MAP_SHARED may need
394 * to be written to disk,
395 * - private pages which have been modified may need to be swapped out
396 * to swap space and (later) to be read back into memory.
400 * The zone field is never updated after free_area_init_core()
401 * sets it, so none of the operations on it need to be atomic.
406 * page->flags layout:
408 * There are three possibilities for how page->flags get
409 * laid out. The first is for the normal case, without
410 * sparsemem. The second is for sparsemem when there is
411 * plenty of space for node and section. The last is when
412 * we have run out of space and have to fall back to an
413 * alternate (slower) way of determining the node.
415 * No sparsemem: | NODE | ZONE | ... | FLAGS |
416 * with space for node: | SECTION | NODE | ZONE | ... | FLAGS |
417 * no space for node: | SECTION | ZONE | ... | FLAGS |
419 #ifdef CONFIG_SPARSEMEM
420 #define SECTIONS_WIDTH SECTIONS_SHIFT
422 #define SECTIONS_WIDTH 0
425 #define ZONES_WIDTH ZONES_SHIFT
427 #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= FLAGS_RESERVED
428 #define NODES_WIDTH NODES_SHIFT
430 #define NODES_WIDTH 0
433 /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */
434 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
435 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
436 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
439 * We are going to use the flags for the page to node mapping if its in
440 * there. This includes the case where there is no node, so it is implicit.
442 #define FLAGS_HAS_NODE (NODES_WIDTH > 0 || NODES_SHIFT == 0)
444 #ifndef PFN_SECTION_SHIFT
445 #define PFN_SECTION_SHIFT 0
449 * Define the bit shifts to access each section. For non-existant
450 * sections we define the shift as 0; that plus a 0 mask ensures
451 * the compiler will optimise away reference to them.
453 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
454 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
455 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
457 /* NODE:ZONE or SECTION:ZONE is used to lookup the zone from a page. */
459 #define ZONETABLE_SHIFT (NODES_SHIFT + ZONES_SHIFT)
461 #define ZONETABLE_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
463 #define ZONETABLE_PGSHIFT ZONES_PGSHIFT
465 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED
466 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED
469 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
470 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
471 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
472 #define ZONETABLE_MASK ((1UL << ZONETABLE_SHIFT) - 1)
474 static inline unsigned long page_zonenum(struct page
*page
)
476 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
480 extern struct zone
*zone_table
[];
482 static inline int page_zone_id(struct page
*page
)
484 return (page
->flags
>> ZONETABLE_PGSHIFT
) & ZONETABLE_MASK
;
486 static inline struct zone
*page_zone(struct page
*page
)
488 return zone_table
[page_zone_id(page
)];
491 static inline unsigned long page_to_nid(struct page
*page
)
494 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
496 return page_zone(page
)->zone_pgdat
->node_id
;
498 static inline unsigned long page_to_section(struct page
*page
)
500 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
503 static inline void set_page_zone(struct page
*page
, unsigned long zone
)
505 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
506 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
508 static inline void set_page_node(struct page
*page
, unsigned long node
)
510 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
511 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
513 static inline void set_page_section(struct page
*page
, unsigned long section
)
515 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
516 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
519 static inline void set_page_links(struct page
*page
, unsigned long zone
,
520 unsigned long node
, unsigned long pfn
)
522 set_page_zone(page
, zone
);
523 set_page_node(page
, node
);
524 set_page_section(page
, pfn_to_section_nr(pfn
));
528 * Some inline functions in vmstat.h depend on page_zone()
530 #include <linux/vmstat.h>
532 #ifndef CONFIG_DISCONTIGMEM
533 /* The array of struct pages - for discontigmem use pgdat->lmem_map */
534 extern struct page
*mem_map
;
537 static __always_inline
void *lowmem_page_address(struct page
*page
)
539 return __va(page_to_pfn(page
) << PAGE_SHIFT
);
542 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
543 #define HASHED_PAGE_VIRTUAL
546 #if defined(WANT_PAGE_VIRTUAL)
547 #define page_address(page) ((page)->virtual)
548 #define set_page_address(page, address) \
550 (page)->virtual = (address); \
552 #define page_address_init() do { } while(0)
555 #if defined(HASHED_PAGE_VIRTUAL)
556 void *page_address(struct page
*page
);
557 void set_page_address(struct page
*page
, void *virtual);
558 void page_address_init(void);
561 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
562 #define page_address(page) lowmem_page_address(page)
563 #define set_page_address(page, address) do { } while(0)
564 #define page_address_init() do { } while(0)
568 * On an anonymous page mapped into a user virtual memory area,
569 * page->mapping points to its anon_vma, not to a struct address_space;
570 * with the PAGE_MAPPING_ANON bit set to distinguish it.
572 * Please note that, confusingly, "page_mapping" refers to the inode
573 * address_space which maps the page from disk; whereas "page_mapped"
574 * refers to user virtual address space into which the page is mapped.
576 #define PAGE_MAPPING_ANON 1
578 extern struct address_space swapper_space
;
579 static inline struct address_space
*page_mapping(struct page
*page
)
581 struct address_space
*mapping
= page
->mapping
;
583 if (unlikely(PageSwapCache(page
)))
584 mapping
= &swapper_space
;
585 else if (unlikely((unsigned long)mapping
& PAGE_MAPPING_ANON
))
590 static inline int PageAnon(struct page
*page
)
592 return ((unsigned long)page
->mapping
& PAGE_MAPPING_ANON
) != 0;
596 * Return the pagecache index of the passed page. Regular pagecache pages
597 * use ->index whereas swapcache pages use ->private
599 static inline pgoff_t
page_index(struct page
*page
)
601 if (unlikely(PageSwapCache(page
)))
602 return page_private(page
);
607 * The atomic page->_mapcount, like _count, starts from -1:
608 * so that transitions both from it and to it can be tracked,
609 * using atomic_inc_and_test and atomic_add_negative(-1).
611 static inline void reset_page_mapcount(struct page
*page
)
613 atomic_set(&(page
)->_mapcount
, -1);
616 static inline int page_mapcount(struct page
*page
)
618 return atomic_read(&(page
)->_mapcount
) + 1;
622 * Return true if this page is mapped into pagetables.
624 static inline int page_mapped(struct page
*page
)
626 return atomic_read(&(page
)->_mapcount
) >= 0;
630 * Error return values for the *_nopage functions
632 #define NOPAGE_SIGBUS (NULL)
633 #define NOPAGE_OOM ((struct page *) (-1))
636 * Different kinds of faults, as returned by handle_mm_fault().
637 * Used to decide whether a process gets delivered SIGBUS or
638 * just gets major/minor fault counters bumped up.
640 #define VM_FAULT_OOM 0x00
641 #define VM_FAULT_SIGBUS 0x01
642 #define VM_FAULT_MINOR 0x02
643 #define VM_FAULT_MAJOR 0x03
646 * Special case for get_user_pages.
647 * Must be in a distinct bit from the above VM_FAULT_ flags.
649 #define VM_FAULT_WRITE 0x10
651 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
653 extern void show_free_areas(void);
656 struct page
*shmem_nopage(struct vm_area_struct
*vma
,
657 unsigned long address
, int *type
);
658 int shmem_set_policy(struct vm_area_struct
*vma
, struct mempolicy
*new);
659 struct mempolicy
*shmem_get_policy(struct vm_area_struct
*vma
,
661 int shmem_lock(struct file
*file
, int lock
, struct user_struct
*user
);
663 #define shmem_nopage filemap_nopage
665 static inline int shmem_lock(struct file
*file
, int lock
,
666 struct user_struct
*user
)
671 static inline int shmem_set_policy(struct vm_area_struct
*vma
,
672 struct mempolicy
*new)
677 static inline struct mempolicy
*shmem_get_policy(struct vm_area_struct
*vma
,
683 struct file
*shmem_file_setup(char *name
, loff_t size
, unsigned long flags
);
684 extern int shmem_mmap(struct file
*file
, struct vm_area_struct
*vma
);
686 int shmem_zero_setup(struct vm_area_struct
*);
689 extern unsigned long shmem_get_unmapped_area(struct file
*file
,
693 unsigned long flags
);
696 static inline int can_do_mlock(void)
698 if (capable(CAP_IPC_LOCK
))
700 if (current
->signal
->rlim
[RLIMIT_MEMLOCK
].rlim_cur
!= 0)
704 extern int user_shm_lock(size_t, struct user_struct
*);
705 extern void user_shm_unlock(size_t, struct user_struct
*);
708 * Parameter block passed down to zap_pte_range in exceptional cases.
711 struct vm_area_struct
*nonlinear_vma
; /* Check page->index if set */
712 struct address_space
*check_mapping
; /* Check page->mapping if set */
713 pgoff_t first_index
; /* Lowest page->index to unmap */
714 pgoff_t last_index
; /* Highest page->index to unmap */
715 spinlock_t
*i_mmap_lock
; /* For unmap_mapping_range: */
716 unsigned long truncate_count
; /* Compare vm_truncate_count */
719 struct page
*vm_normal_page(struct vm_area_struct
*, unsigned long, pte_t
);
720 unsigned long zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
721 unsigned long size
, struct zap_details
*);
722 unsigned long unmap_vmas(struct mmu_gather
**tlb
,
723 struct vm_area_struct
*start_vma
, unsigned long start_addr
,
724 unsigned long end_addr
, unsigned long *nr_accounted
,
725 struct zap_details
*);
726 void free_pgd_range(struct mmu_gather
**tlb
, unsigned long addr
,
727 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
728 void free_pgtables(struct mmu_gather
**tlb
, struct vm_area_struct
*start_vma
,
729 unsigned long floor
, unsigned long ceiling
);
730 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
731 struct vm_area_struct
*vma
);
732 int zeromap_page_range(struct vm_area_struct
*vma
, unsigned long from
,
733 unsigned long size
, pgprot_t prot
);
734 void unmap_mapping_range(struct address_space
*mapping
,
735 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
737 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
738 loff_t
const holebegin
, loff_t
const holelen
)
740 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
743 extern int vmtruncate(struct inode
* inode
, loff_t offset
);
744 extern int vmtruncate_range(struct inode
* inode
, loff_t offset
, loff_t end
);
745 extern int install_page(struct mm_struct
*mm
, struct vm_area_struct
*vma
, unsigned long addr
, struct page
*page
, pgprot_t prot
);
746 extern int install_file_pte(struct mm_struct
*mm
, struct vm_area_struct
*vma
, unsigned long addr
, unsigned long pgoff
, pgprot_t prot
);
749 extern int __handle_mm_fault(struct mm_struct
*mm
,struct vm_area_struct
*vma
,
750 unsigned long address
, int write_access
);
752 static inline int handle_mm_fault(struct mm_struct
*mm
,
753 struct vm_area_struct
*vma
, unsigned long address
,
756 return __handle_mm_fault(mm
, vma
, address
, write_access
) &
760 static inline int handle_mm_fault(struct mm_struct
*mm
,
761 struct vm_area_struct
*vma
, unsigned long address
,
764 /* should never happen if there's no MMU */
766 return VM_FAULT_SIGBUS
;
770 extern int make_pages_present(unsigned long addr
, unsigned long end
);
771 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
772 void install_arg_page(struct vm_area_struct
*, struct page
*, unsigned long);
774 int get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
, unsigned long start
,
775 int len
, int write
, int force
, struct page
**pages
, struct vm_area_struct
**vmas
);
776 void print_bad_pte(struct vm_area_struct
*, pte_t
, unsigned long);
778 int __set_page_dirty_buffers(struct page
*page
);
779 int __set_page_dirty_nobuffers(struct page
*page
);
780 int redirty_page_for_writepage(struct writeback_control
*wbc
,
782 int FASTCALL(set_page_dirty(struct page
*page
));
783 int set_page_dirty_lock(struct page
*page
);
784 int clear_page_dirty_for_io(struct page
*page
);
786 extern unsigned long do_mremap(unsigned long addr
,
787 unsigned long old_len
, unsigned long new_len
,
788 unsigned long flags
, unsigned long new_addr
);
791 * Prototype to add a shrinker callback for ageable caches.
793 * These functions are passed a count `nr_to_scan' and a gfpmask. They should
794 * scan `nr_to_scan' objects, attempting to free them.
796 * The callback must return the number of objects which remain in the cache.
798 * The callback will be passed nr_to_scan == 0 when the VM is querying the
799 * cache size, so a fastpath for that case is appropriate.
801 typedef int (*shrinker_t
)(int nr_to_scan
, gfp_t gfp_mask
);
804 * Add an aging callback. The int is the number of 'seeks' it takes
805 * to recreate one of the objects that these functions age.
808 #define DEFAULT_SEEKS 2
810 extern struct shrinker
*set_shrinker(int, shrinker_t
);
811 extern void remove_shrinker(struct shrinker
*shrinker
);
813 extern pte_t
*FASTCALL(get_locked_pte(struct mm_struct
*mm
, unsigned long addr
, spinlock_t
**ptl
));
815 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
816 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
817 int __pte_alloc(struct mm_struct
*mm
, pmd_t
*pmd
, unsigned long address
);
818 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
821 * The following ifdef needed to get the 4level-fixup.h header to work.
822 * Remove it when 4level-fixup.h has been removed.
824 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
825 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
827 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
828 NULL
: pud_offset(pgd
, address
);
831 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
833 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
834 NULL
: pmd_offset(pud
, address
);
836 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
838 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
840 * We tuck a spinlock to guard each pagetable page into its struct page,
841 * at page->private, with BUILD_BUG_ON to make sure that this will not
842 * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
843 * When freeing, reset page->mapping so free_pages_check won't complain.
845 #define __pte_lockptr(page) &((page)->ptl)
846 #define pte_lock_init(_page) do { \
847 spin_lock_init(__pte_lockptr(_page)); \
849 #define pte_lock_deinit(page) ((page)->mapping = NULL)
850 #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
853 * We use mm->page_table_lock to guard all pagetable pages of the mm.
855 #define pte_lock_init(page) do {} while (0)
856 #define pte_lock_deinit(page) do {} while (0)
857 #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
858 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
860 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
862 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
863 pte_t *__pte = pte_offset_map(pmd, address); \
869 #define pte_unmap_unlock(pte, ptl) do { \
874 #define pte_alloc_map(mm, pmd, address) \
875 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
876 NULL: pte_offset_map(pmd, address))
878 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
879 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
880 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
882 #define pte_alloc_kernel(pmd, address) \
883 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
884 NULL: pte_offset_kernel(pmd, address))
886 extern void free_area_init(unsigned long * zones_size
);
887 extern void free_area_init_node(int nid
, pg_data_t
*pgdat
,
888 unsigned long * zones_size
, unsigned long zone_start_pfn
,
889 unsigned long *zholes_size
);
890 extern void memmap_init_zone(unsigned long, int, unsigned long, unsigned long);
891 extern void setup_per_zone_pages_min(void);
892 extern void mem_init(void);
893 extern void show_mem(void);
894 extern void si_meminfo(struct sysinfo
* val
);
895 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
898 extern void setup_per_cpu_pageset(void);
900 static inline void setup_per_cpu_pageset(void) {}
904 void vma_prio_tree_add(struct vm_area_struct
*, struct vm_area_struct
*old
);
905 void vma_prio_tree_insert(struct vm_area_struct
*, struct prio_tree_root
*);
906 void vma_prio_tree_remove(struct vm_area_struct
*, struct prio_tree_root
*);
907 struct vm_area_struct
*vma_prio_tree_next(struct vm_area_struct
*vma
,
908 struct prio_tree_iter
*iter
);
910 #define vma_prio_tree_foreach(vma, iter, root, begin, end) \
911 for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \
912 (vma = vma_prio_tree_next(vma, iter)); )
914 static inline void vma_nonlinear_insert(struct vm_area_struct
*vma
,
915 struct list_head
*list
)
917 vma
->shared
.vm_set
.parent
= NULL
;
918 list_add_tail(&vma
->shared
.vm_set
.list
, list
);
922 extern int __vm_enough_memory(long pages
, int cap_sys_admin
);
923 extern void vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
924 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
925 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
926 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
927 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
929 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
930 extern int split_vma(struct mm_struct
*,
931 struct vm_area_struct
*, unsigned long addr
, int new_below
);
932 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
933 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
934 struct rb_node
**, struct rb_node
*);
935 extern void unlink_file_vma(struct vm_area_struct
*);
936 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
937 unsigned long addr
, unsigned long len
, pgoff_t pgoff
);
938 extern void exit_mmap(struct mm_struct
*);
939 extern int may_expand_vm(struct mm_struct
*mm
, unsigned long npages
);
941 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
943 extern unsigned long do_mmap_pgoff(struct file
*file
, unsigned long addr
,
944 unsigned long len
, unsigned long prot
,
945 unsigned long flag
, unsigned long pgoff
);
947 static inline unsigned long do_mmap(struct file
*file
, unsigned long addr
,
948 unsigned long len
, unsigned long prot
,
949 unsigned long flag
, unsigned long offset
)
951 unsigned long ret
= -EINVAL
;
952 if ((offset
+ PAGE_ALIGN(len
)) < offset
)
954 if (!(offset
& ~PAGE_MASK
))
955 ret
= do_mmap_pgoff(file
, addr
, len
, prot
, flag
, offset
>> PAGE_SHIFT
);
960 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
962 extern unsigned long do_brk(unsigned long, unsigned long);
965 extern unsigned long page_unuse(struct page
*);
966 extern void truncate_inode_pages(struct address_space
*, loff_t
);
967 extern void truncate_inode_pages_range(struct address_space
*,
968 loff_t lstart
, loff_t lend
);
970 /* generic vm_area_ops exported for stackable file systems */
971 extern struct page
*filemap_nopage(struct vm_area_struct
*, unsigned long, int *);
972 extern int filemap_populate(struct vm_area_struct
*, unsigned long,
973 unsigned long, pgprot_t
, unsigned long, int);
975 /* mm/page-writeback.c */
976 int write_one_page(struct page
*page
, int wait
);
979 #define VM_MAX_READAHEAD 128 /* kbytes */
980 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
981 #define VM_MAX_CACHE_HIT 256 /* max pages in a row in cache before
982 * turning readahead off */
984 int do_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
985 pgoff_t offset
, unsigned long nr_to_read
);
986 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
987 pgoff_t offset
, unsigned long nr_to_read
);
988 unsigned long page_cache_readahead(struct address_space
*mapping
,
989 struct file_ra_state
*ra
,
993 void handle_ra_miss(struct address_space
*mapping
,
994 struct file_ra_state
*ra
, pgoff_t offset
);
995 unsigned long max_sane_readahead(unsigned long nr
);
997 /* Do stack extension */
998 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
1000 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
1003 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1004 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
1005 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
1006 struct vm_area_struct
**pprev
);
1008 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1009 NULL if none. Assume start_addr < end_addr. */
1010 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
1012 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
1014 if (vma
&& end_addr
<= vma
->vm_start
)
1019 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
1021 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
1024 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
1025 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
1026 struct page
*vmalloc_to_page(void *addr
);
1027 unsigned long vmalloc_to_pfn(void *addr
);
1028 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
1029 unsigned long pfn
, unsigned long size
, pgprot_t
);
1030 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
1032 struct page
*follow_page(struct vm_area_struct
*, unsigned long address
,
1033 unsigned int foll_flags
);
1034 #define FOLL_WRITE 0x01 /* check pte is writable */
1035 #define FOLL_TOUCH 0x02 /* mark page accessed */
1036 #define FOLL_GET 0x04 /* do get_page on page */
1037 #define FOLL_ANON 0x08 /* give ZERO_PAGE if no pgtable */
1039 #ifdef CONFIG_PROC_FS
1040 void vm_stat_account(struct mm_struct
*, unsigned long, struct file
*, long);
1042 static inline void vm_stat_account(struct mm_struct
*mm
,
1043 unsigned long flags
, struct file
*file
, long pages
)
1046 #endif /* CONFIG_PROC_FS */
1048 #ifndef CONFIG_DEBUG_PAGEALLOC
1050 kernel_map_pages(struct page
*page
, int numpages
, int enable
)
1052 if (!PageHighMem(page
) && !enable
)
1053 debug_check_no_locks_freed(page_address(page
),
1054 numpages
* PAGE_SIZE
);
1058 extern struct vm_area_struct
*get_gate_vma(struct task_struct
*tsk
);
1059 #ifdef __HAVE_ARCH_GATE_AREA
1060 int in_gate_area_no_task(unsigned long addr
);
1061 int in_gate_area(struct task_struct
*task
, unsigned long addr
);
1063 int in_gate_area_no_task(unsigned long addr
);
1064 #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
1065 #endif /* __HAVE_ARCH_GATE_AREA */
1067 /* /proc/<pid>/oom_adj set to -17 protects from the oom-killer */
1068 #define OOM_DISABLE -17
1070 int drop_caches_sysctl_handler(struct ctl_table
*, int, struct file
*,
1071 void __user
*, size_t *, loff_t
*);
1072 unsigned long shrink_slab(unsigned long scanned
, gfp_t gfp_mask
,
1073 unsigned long lru_pages
);
1074 void drop_pagecache(void);
1075 void drop_slab(void);
1078 #define randomize_va_space 0
1080 extern int randomize_va_space
;
1083 const char *arch_vma_name(struct vm_area_struct
*vma
);
1085 #endif /* __KERNEL__ */
1086 #endif /* _LINUX_MM_H */