4 #include <linux/sched.h>
5 #include <linux/errno.h>
9 #include <linux/config.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>
20 #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
21 extern unsigned long max_mapnr
;
24 extern unsigned long num_physpages
;
25 extern void * high_memory
;
26 extern unsigned long vmalloc_earlyreserve
;
27 extern int page_cluster
;
30 extern int sysctl_legacy_va_layout
;
32 #define sysctl_legacy_va_layout 0
36 #include <asm/pgtable.h>
37 #include <asm/processor.h>
38 #include <asm/atomic.h>
40 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
43 * Linux kernel virtual memory manager primitives.
44 * The idea being to have a "virtual" mm in the same way
45 * we have a virtual fs - giving a cleaner interface to the
46 * mm details, and allowing different kinds of memory mappings
47 * (from shared memory to executable loading to arbitrary
52 * This struct defines a memory VMM memory area. There is one of these
53 * per VM-area/task. A VM area is any part of the process virtual memory
54 * space that has a special rule for the page-fault handlers (ie a shared
55 * library, the executable area etc).
57 struct vm_area_struct
{
58 struct mm_struct
* vm_mm
; /* The address space we belong to. */
59 unsigned long vm_start
; /* Our start address within vm_mm. */
60 unsigned long vm_end
; /* The first byte after our end address
63 /* linked list of VM areas per task, sorted by address */
64 struct vm_area_struct
*vm_next
;
66 pgprot_t vm_page_prot
; /* Access permissions of this VMA. */
67 unsigned long vm_flags
; /* Flags, listed below. */
72 * For areas with an address space and backing store,
73 * linkage into the address_space->i_mmap prio tree, or
74 * linkage to the list of like vmas hanging off its node, or
75 * linkage of vma in the address_space->i_mmap_nonlinear list.
79 struct list_head list
;
80 void *parent
; /* aligns with prio_tree_node parent */
81 struct vm_area_struct
*head
;
84 struct raw_prio_tree_node prio_tree_node
;
88 * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
89 * list, after a COW of one of the file pages. A MAP_SHARED vma
90 * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
91 * or brk vma (with NULL file) can only be in an anon_vma list.
93 struct list_head anon_vma_node
; /* Serialized by anon_vma->lock */
94 struct anon_vma
*anon_vma
; /* Serialized by page_table_lock */
96 /* Function pointers to deal with this struct. */
97 struct vm_operations_struct
* vm_ops
;
99 /* Information about our backing store: */
100 unsigned long vm_pgoff
; /* Offset (within vm_file) in PAGE_SIZE
101 units, *not* PAGE_CACHE_SIZE */
102 struct file
* vm_file
; /* File we map to (can be NULL). */
103 void * vm_private_data
; /* was vm_pte (shared mem) */
104 unsigned long vm_truncate_count
;/* truncate_count or restart_addr */
107 atomic_t vm_usage
; /* refcount (VMAs shared if !MMU) */
110 struct mempolicy
*vm_policy
; /* NUMA policy for the VMA */
115 * This struct defines the per-mm list of VMAs for uClinux. If CONFIG_MMU is
116 * disabled, then there's a single shared list of VMAs maintained by the
117 * system, and mm's subscribe to these individually
119 struct vm_list_struct
{
120 struct vm_list_struct
*next
;
121 struct vm_area_struct
*vma
;
125 extern struct rb_root nommu_vma_tree
;
126 extern struct rw_semaphore nommu_vma_sem
;
128 extern unsigned int kobjsize(const void *objp
);
134 #define VM_READ 0x00000001 /* currently active flags */
135 #define VM_WRITE 0x00000002
136 #define VM_EXEC 0x00000004
137 #define VM_SHARED 0x00000008
139 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
140 #define VM_MAYWRITE 0x00000020
141 #define VM_MAYEXEC 0x00000040
142 #define VM_MAYSHARE 0x00000080
144 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
145 #define VM_GROWSUP 0x00000200
146 #define VM_SHM 0x00000400 /* shared memory area, don't swap out */
147 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
149 #define VM_EXECUTABLE 0x00001000
150 #define VM_LOCKED 0x00002000
151 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
153 /* Used by sys_madvise() */
154 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
155 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
157 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
158 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
159 #define VM_RESERVED 0x00080000 /* Don't unmap it from swap_out */
160 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
161 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
162 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
163 #define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
165 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
166 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
169 #ifdef CONFIG_STACK_GROWSUP
170 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
172 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
175 #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
176 #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
177 #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
178 #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
179 #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
182 * mapping from the currently active vm_flags protection bits (the
183 * low four bits) to a page protection mask..
185 extern pgprot_t protection_map
[16];
189 * These are the virtual MM functions - opening of an area, closing and
190 * unmapping it (needed to keep files on disk up-to-date etc), pointer
191 * to the functions called when a no-page or a wp-page exception occurs.
193 struct vm_operations_struct
{
194 void (*open
)(struct vm_area_struct
* area
);
195 void (*close
)(struct vm_area_struct
* area
);
196 struct page
* (*nopage
)(struct vm_area_struct
* area
, unsigned long address
, int *type
);
197 int (*populate
)(struct vm_area_struct
* area
, unsigned long address
, unsigned long len
, pgprot_t prot
, unsigned long pgoff
, int nonblock
);
199 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
200 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
208 #ifdef ARCH_HAS_ATOMIC_UNSIGNED
209 typedef unsigned page_flags_t
;
211 typedef unsigned long page_flags_t
;
215 * Each physical page in the system has a struct page associated with
216 * it to keep track of whatever it is we are using the page for at the
217 * moment. Note that we have no way to track which tasks are using
221 page_flags_t flags
; /* Atomic flags, some possibly
222 * updated asynchronously */
223 atomic_t _count
; /* Usage count, see below. */
224 atomic_t _mapcount
; /* Count of ptes mapped in mms,
225 * to show when page is mapped
226 * & limit reverse map searches.
228 unsigned long private; /* Mapping-private opaque data:
229 * usually used for buffer_heads
230 * if PagePrivate set; used for
231 * swp_entry_t if PageSwapCache
232 * When page is free, this indicates
233 * order in the buddy system.
235 struct address_space
*mapping
; /* If low bit clear, points to
236 * inode address_space, or NULL.
237 * If page mapped as anonymous
238 * memory, low bit is set, and
239 * it points to anon_vma object:
240 * see PAGE_MAPPING_ANON below.
242 pgoff_t index
; /* Our offset within mapping. */
243 struct list_head lru
; /* Pageout list, eg. active_list
244 * protected by zone->lru_lock !
247 * On machines where all RAM is mapped into kernel address space,
248 * we can simply calculate the virtual address. On machines with
249 * highmem some memory is mapped into kernel virtual memory
250 * dynamically, so we need a place to store that address.
251 * Note that this field could be 16 bits on x86 ... ;)
253 * Architectures with slow multiplication can define
254 * WANT_PAGE_VIRTUAL in asm/page.h
256 #if defined(WANT_PAGE_VIRTUAL)
257 void *virtual; /* Kernel virtual address (NULL if
258 not kmapped, ie. highmem) */
259 #endif /* WANT_PAGE_VIRTUAL */
263 * FIXME: take this include out, include page-flags.h in
264 * files which need it (119 of them)
266 #include <linux/page-flags.h>
269 * Methods to modify the page usage count.
271 * What counts for a page usage:
272 * - cache mapping (page->mapping)
273 * - private data (page->private)
274 * - page mapped in a task's page tables, each mapping
275 * is counted separately
277 * Also, many kernel routines increase the page count before a critical
278 * routine so they can be sure the page doesn't go away from under them.
280 * Since 2.6.6 (approx), a free page has ->_count = -1. This is so that we
281 * can use atomic_add_negative(-1, page->_count) to detect when the page
282 * becomes free and so that we can also use atomic_inc_and_test to atomically
283 * detect when we just tried to grab a ref on a page which some other CPU has
284 * already deemed to be freeable.
286 * NO code should make assumptions about this internal detail! Use the provided
287 * macros which retain the old rules: page_count(page) == 0 is a free page.
291 * Drop a ref, return true if the logical refcount fell to zero (the page has
294 #define put_page_testzero(p) \
296 BUG_ON(page_count(p) == 0); \
297 atomic_add_negative(-1, &(p)->_count); \
301 * Grab a ref, return true if the page previously had a logical refcount of
302 * zero. ie: returns true if we just grabbed an already-deemed-to-be-free page
304 #define get_page_testone(p) atomic_inc_and_test(&(p)->_count)
306 #define set_page_count(p,v) atomic_set(&(p)->_count, v - 1)
307 #define __put_page(p) atomic_dec(&(p)->_count)
309 extern void FASTCALL(__page_cache_release(struct page
*));
311 #ifdef CONFIG_HUGETLB_PAGE
313 static inline int page_count(struct page
*p
)
316 p
= (struct page
*)p
->private;
317 return atomic_read(&(p
)->_count
) + 1;
320 static inline void get_page(struct page
*page
)
322 if (unlikely(PageCompound(page
)))
323 page
= (struct page
*)page
->private;
324 atomic_inc(&page
->_count
);
327 void put_page(struct page
*page
);
329 #else /* CONFIG_HUGETLB_PAGE */
331 #define page_count(p) (atomic_read(&(p)->_count) + 1)
333 static inline void get_page(struct page
*page
)
335 atomic_inc(&page
->_count
);
338 static inline void put_page(struct page
*page
)
340 if (!PageReserved(page
) && put_page_testzero(page
))
341 __page_cache_release(page
);
344 #endif /* CONFIG_HUGETLB_PAGE */
347 * Multiple processes may "see" the same page. E.g. for untouched
348 * mappings of /dev/null, all processes see the same page full of
349 * zeroes, and text pages of executables and shared libraries have
350 * only one copy in memory, at most, normally.
352 * For the non-reserved pages, page_count(page) denotes a reference count.
353 * page_count() == 0 means the page is free.
354 * page_count() == 1 means the page is used for exactly one purpose
355 * (e.g. a private data page of one process).
357 * A page may be used for kmalloc() or anyone else who does a
358 * __get_free_page(). In this case the page_count() is at least 1, and
359 * all other fields are unused but should be 0 or NULL. The
360 * management of this page is the responsibility of the one who uses
363 * The other pages (we may call them "process pages") are completely
364 * managed by the Linux memory manager: I/O, buffers, swapping etc.
365 * The following discussion applies only to them.
367 * A page may belong to an inode's memory mapping. In this case,
368 * page->mapping is the pointer to the inode, and page->index is the
369 * file offset of the page, in units of PAGE_CACHE_SIZE.
371 * A page contains an opaque `private' member, which belongs to the
372 * page's address_space. Usually, this is the address of a circular
373 * list of the page's disk buffers.
375 * For pages belonging to inodes, the page_count() is the number of
376 * attaches, plus 1 if `private' contains something, plus one for
377 * the page cache itself.
379 * All pages belonging to an inode are in these doubly linked lists:
380 * mapping->clean_pages, mapping->dirty_pages and mapping->locked_pages;
381 * using the page->list list_head. These fields are also used for
382 * freelist managemet (when page_count()==0).
384 * There is also a per-mapping radix tree mapping index to the page
385 * in memory if present. The tree is rooted at mapping->root.
387 * All process pages can do I/O:
388 * - inode pages may need to be read from disk,
389 * - inode pages which have been modified and are MAP_SHARED may need
390 * to be written to disk,
391 * - private pages which have been modified may need to be swapped out
392 * to swap space and (later) to be read back into memory.
396 * The zone field is never updated after free_area_init_core()
397 * sets it, so none of the operations on it need to be atomic.
398 * We'll have up to (MAX_NUMNODES * MAX_NR_ZONES) zones total,
399 * so we use (MAX_NODES_SHIFT + MAX_ZONES_SHIFT) here to get enough bits.
401 #define NODEZONE_SHIFT (sizeof(page_flags_t)*8 - MAX_NODES_SHIFT - MAX_ZONES_SHIFT)
402 #define NODEZONE(node, zone) ((node << ZONES_SHIFT) | zone)
404 static inline unsigned long page_zonenum(struct page
*page
)
406 return (page
->flags
>> NODEZONE_SHIFT
) & (~(~0UL << ZONES_SHIFT
));
408 static inline unsigned long page_to_nid(struct page
*page
)
410 return (page
->flags
>> (NODEZONE_SHIFT
+ ZONES_SHIFT
));
414 extern struct zone
*zone_table
[];
416 static inline struct zone
*page_zone(struct page
*page
)
418 return zone_table
[page
->flags
>> NODEZONE_SHIFT
];
421 static inline void set_page_zone(struct page
*page
, unsigned long nodezone_num
)
423 page
->flags
&= ~(~0UL << NODEZONE_SHIFT
);
424 page
->flags
|= nodezone_num
<< NODEZONE_SHIFT
;
427 #ifndef CONFIG_DISCONTIGMEM
428 /* The array of struct pages - for discontigmem use pgdat->lmem_map */
429 extern struct page
*mem_map
;
432 static inline void *lowmem_page_address(struct page
*page
)
434 return __va(page_to_pfn(page
) << PAGE_SHIFT
);
437 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
438 #define HASHED_PAGE_VIRTUAL
441 #if defined(WANT_PAGE_VIRTUAL)
442 #define page_address(page) ((page)->virtual)
443 #define set_page_address(page, address) \
445 (page)->virtual = (address); \
447 #define page_address_init() do { } while(0)
450 #if defined(HASHED_PAGE_VIRTUAL)
451 void *page_address(struct page
*page
);
452 void set_page_address(struct page
*page
, void *virtual);
453 void page_address_init(void);
456 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
457 #define page_address(page) lowmem_page_address(page)
458 #define set_page_address(page, address) do { } while(0)
459 #define page_address_init() do { } while(0)
463 * On an anonymous page mapped into a user virtual memory area,
464 * page->mapping points to its anon_vma, not to a struct address_space;
465 * with the PAGE_MAPPING_ANON bit set to distinguish it.
467 * Please note that, confusingly, "page_mapping" refers to the inode
468 * address_space which maps the page from disk; whereas "page_mapped"
469 * refers to user virtual address space into which the page is mapped.
471 #define PAGE_MAPPING_ANON 1
473 extern struct address_space swapper_space
;
474 static inline struct address_space
*page_mapping(struct page
*page
)
476 struct address_space
*mapping
= page
->mapping
;
478 if (unlikely(PageSwapCache(page
)))
479 mapping
= &swapper_space
;
480 else if (unlikely((unsigned long)mapping
& PAGE_MAPPING_ANON
))
485 static inline int PageAnon(struct page
*page
)
487 return ((unsigned long)page
->mapping
& PAGE_MAPPING_ANON
) != 0;
491 * Return the pagecache index of the passed page. Regular pagecache pages
492 * use ->index whereas swapcache pages use ->private
494 static inline pgoff_t
page_index(struct page
*page
)
496 if (unlikely(PageSwapCache(page
)))
497 return page
->private;
502 * The atomic page->_mapcount, like _count, starts from -1:
503 * so that transitions both from it and to it can be tracked,
504 * using atomic_inc_and_test and atomic_add_negative(-1).
506 static inline void reset_page_mapcount(struct page
*page
)
508 atomic_set(&(page
)->_mapcount
, -1);
511 static inline int page_mapcount(struct page
*page
)
513 return atomic_read(&(page
)->_mapcount
) + 1;
517 * Return true if this page is mapped into pagetables.
519 static inline int page_mapped(struct page
*page
)
521 return atomic_read(&(page
)->_mapcount
) >= 0;
525 * Error return values for the *_nopage functions
527 #define NOPAGE_SIGBUS (NULL)
528 #define NOPAGE_OOM ((struct page *) (-1))
531 * Different kinds of faults, as returned by handle_mm_fault().
532 * Used to decide whether a process gets delivered SIGBUS or
533 * just gets major/minor fault counters bumped up.
535 #define VM_FAULT_OOM (-1)
536 #define VM_FAULT_SIGBUS 0
537 #define VM_FAULT_MINOR 1
538 #define VM_FAULT_MAJOR 2
540 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
542 extern void show_free_areas(void);
545 struct page
*shmem_nopage(struct vm_area_struct
*vma
,
546 unsigned long address
, int *type
);
547 int shmem_set_policy(struct vm_area_struct
*vma
, struct mempolicy
*new);
548 struct mempolicy
*shmem_get_policy(struct vm_area_struct
*vma
,
550 int shmem_lock(struct file
*file
, int lock
, struct user_struct
*user
);
552 #define shmem_nopage filemap_nopage
553 #define shmem_lock(a, b, c) ({0;}) /* always in memory, no need to lock */
554 #define shmem_set_policy(a, b) (0)
555 #define shmem_get_policy(a, b) (NULL)
557 struct file
*shmem_file_setup(char *name
, loff_t size
, unsigned long flags
);
559 int shmem_zero_setup(struct vm_area_struct
*);
561 static inline int can_do_mlock(void)
563 if (capable(CAP_IPC_LOCK
))
565 if (current
->signal
->rlim
[RLIMIT_MEMLOCK
].rlim_cur
!= 0)
569 extern int user_shm_lock(size_t, struct user_struct
*);
570 extern void user_shm_unlock(size_t, struct user_struct
*);
573 * Parameter block passed down to zap_pte_range in exceptional cases.
576 struct vm_area_struct
*nonlinear_vma
; /* Check page->index if set */
577 struct address_space
*check_mapping
; /* Check page->mapping if set */
578 pgoff_t first_index
; /* Lowest page->index to unmap */
579 pgoff_t last_index
; /* Highest page->index to unmap */
580 spinlock_t
*i_mmap_lock
; /* For unmap_mapping_range: */
581 unsigned long truncate_count
; /* Compare vm_truncate_count */
584 unsigned long zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
585 unsigned long size
, struct zap_details
*);
586 unsigned long unmap_vmas(struct mmu_gather
**tlb
, struct mm_struct
*mm
,
587 struct vm_area_struct
*start_vma
, unsigned long start_addr
,
588 unsigned long end_addr
, unsigned long *nr_accounted
,
589 struct zap_details
*);
590 void free_pgd_range(struct mmu_gather
**tlb
, unsigned long addr
,
591 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
592 void free_pgtables(struct mmu_gather
**tlb
, struct vm_area_struct
*start_vma
,
593 unsigned long floor
, unsigned long ceiling
);
594 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
595 struct vm_area_struct
*vma
);
596 int zeromap_page_range(struct vm_area_struct
*vma
, unsigned long from
,
597 unsigned long size
, pgprot_t prot
);
598 void unmap_mapping_range(struct address_space
*mapping
,
599 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
601 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
602 loff_t
const holebegin
, loff_t
const holelen
)
604 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
607 extern int vmtruncate(struct inode
* inode
, loff_t offset
);
608 extern pud_t
*FASTCALL(__pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
));
609 extern pmd_t
*FASTCALL(__pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
));
610 extern pte_t
*FASTCALL(pte_alloc_kernel(struct mm_struct
*mm
, pmd_t
*pmd
, unsigned long address
));
611 extern pte_t
*FASTCALL(pte_alloc_map(struct mm_struct
*mm
, pmd_t
*pmd
, unsigned long address
));
612 extern int install_page(struct mm_struct
*mm
, struct vm_area_struct
*vma
, unsigned long addr
, struct page
*page
, pgprot_t prot
);
613 extern int install_file_pte(struct mm_struct
*mm
, struct vm_area_struct
*vma
, unsigned long addr
, unsigned long pgoff
, pgprot_t prot
);
614 extern int handle_mm_fault(struct mm_struct
*mm
,struct vm_area_struct
*vma
, unsigned long address
, int write_access
);
615 extern int make_pages_present(unsigned long addr
, unsigned long end
);
616 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
617 void install_arg_page(struct vm_area_struct
*, struct page
*, unsigned long);
619 int get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
, unsigned long start
,
620 int len
, int write
, int force
, struct page
**pages
, struct vm_area_struct
**vmas
);
622 int __set_page_dirty_buffers(struct page
*page
);
623 int __set_page_dirty_nobuffers(struct page
*page
);
624 int redirty_page_for_writepage(struct writeback_control
*wbc
,
626 int FASTCALL(set_page_dirty(struct page
*page
));
627 int set_page_dirty_lock(struct page
*page
);
628 int clear_page_dirty_for_io(struct page
*page
);
630 extern unsigned long do_mremap(unsigned long addr
,
631 unsigned long old_len
, unsigned long new_len
,
632 unsigned long flags
, unsigned long new_addr
);
635 * Prototype to add a shrinker callback for ageable caches.
637 * These functions are passed a count `nr_to_scan' and a gfpmask. They should
638 * scan `nr_to_scan' objects, attempting to free them.
640 * The callback must return the number of objects which remain in the cache.
642 * The callback will be passed nr_to_scan == 0 when the VM is querying the
643 * cache size, so a fastpath for that case is appropriate.
645 typedef int (*shrinker_t
)(int nr_to_scan
, unsigned int gfp_mask
);
648 * Add an aging callback. The int is the number of 'seeks' it takes
649 * to recreate one of the objects that these functions age.
652 #define DEFAULT_SEEKS 2
654 extern struct shrinker
*set_shrinker(int, shrinker_t
);
655 extern void remove_shrinker(struct shrinker
*shrinker
);
658 * On a two-level or three-level page table, this ends up being trivial. Thus
659 * the inlining and the symmetry break with pte_alloc_map() that does all
660 * of this out-of-line.
663 * The following ifdef needed to get the 4level-fixup.h header to work.
664 * Remove it when 4level-fixup.h has been removed.
667 #ifndef __ARCH_HAS_4LEVEL_HACK
668 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
671 return __pud_alloc(mm
, pgd
, address
);
672 return pud_offset(pgd
, address
);
675 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
678 return __pmd_alloc(mm
, pud
, address
);
679 return pmd_offset(pud
, address
);
682 #endif /* CONFIG_MMU */
684 extern void free_area_init(unsigned long * zones_size
);
685 extern void free_area_init_node(int nid
, pg_data_t
*pgdat
,
686 unsigned long * zones_size
, unsigned long zone_start_pfn
,
687 unsigned long *zholes_size
);
688 extern void memmap_init_zone(unsigned long, int, unsigned long, unsigned long);
689 extern void mem_init(void);
690 extern void show_mem(void);
691 extern void si_meminfo(struct sysinfo
* val
);
692 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
695 extern void setup_per_cpu_pageset(void);
697 static inline void setup_per_cpu_pageset(void) {}
701 void vma_prio_tree_add(struct vm_area_struct
*, struct vm_area_struct
*old
);
702 void vma_prio_tree_insert(struct vm_area_struct
*, struct prio_tree_root
*);
703 void vma_prio_tree_remove(struct vm_area_struct
*, struct prio_tree_root
*);
704 struct vm_area_struct
*vma_prio_tree_next(struct vm_area_struct
*vma
,
705 struct prio_tree_iter
*iter
);
707 #define vma_prio_tree_foreach(vma, iter, root, begin, end) \
708 for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \
709 (vma = vma_prio_tree_next(vma, iter)); )
711 static inline void vma_nonlinear_insert(struct vm_area_struct
*vma
,
712 struct list_head
*list
)
714 vma
->shared
.vm_set
.parent
= NULL
;
715 list_add_tail(&vma
->shared
.vm_set
.list
, list
);
719 extern int __vm_enough_memory(long pages
, int cap_sys_admin
);
720 extern void vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
721 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
722 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
723 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
724 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
726 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
727 extern int split_vma(struct mm_struct
*,
728 struct vm_area_struct
*, unsigned long addr
, int new_below
);
729 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
730 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
731 struct rb_node
**, struct rb_node
*);
732 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
733 unsigned long addr
, unsigned long len
, pgoff_t pgoff
);
734 extern void exit_mmap(struct mm_struct
*);
735 extern int may_expand_vm(struct mm_struct
*mm
, unsigned long npages
);
737 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
739 extern unsigned long do_mmap_pgoff(struct file
*file
, unsigned long addr
,
740 unsigned long len
, unsigned long prot
,
741 unsigned long flag
, unsigned long pgoff
);
743 static inline unsigned long do_mmap(struct file
*file
, unsigned long addr
,
744 unsigned long len
, unsigned long prot
,
745 unsigned long flag
, unsigned long offset
)
747 unsigned long ret
= -EINVAL
;
748 if ((offset
+ PAGE_ALIGN(len
)) < offset
)
750 if (!(offset
& ~PAGE_MASK
))
751 ret
= do_mmap_pgoff(file
, addr
, len
, prot
, flag
, offset
>> PAGE_SHIFT
);
756 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
758 extern unsigned long do_brk(unsigned long, unsigned long);
761 extern unsigned long page_unuse(struct page
*);
762 extern void truncate_inode_pages(struct address_space
*, loff_t
);
764 /* generic vm_area_ops exported for stackable file systems */
765 extern struct page
*filemap_nopage(struct vm_area_struct
*, unsigned long, int *);
766 extern int filemap_populate(struct vm_area_struct
*, unsigned long,
767 unsigned long, pgprot_t
, unsigned long, int);
769 /* mm/page-writeback.c */
770 int write_one_page(struct page
*page
, int wait
);
773 #define VM_MAX_READAHEAD 128 /* kbytes */
774 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
775 #define VM_MAX_CACHE_HIT 256 /* max pages in a row in cache before
776 * turning readahead off */
778 int do_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
779 unsigned long offset
, unsigned long nr_to_read
);
780 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
781 unsigned long offset
, unsigned long nr_to_read
);
782 unsigned long page_cache_readahead(struct address_space
*mapping
,
783 struct file_ra_state
*ra
,
785 unsigned long offset
,
787 void handle_ra_miss(struct address_space
*mapping
,
788 struct file_ra_state
*ra
, pgoff_t offset
);
789 unsigned long max_sane_readahead(unsigned long nr
);
791 /* Do stack extension */
792 extern int expand_stack(struct vm_area_struct
* vma
, unsigned long address
);
794 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
795 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
796 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
797 struct vm_area_struct
**pprev
);
799 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
800 NULL if none. Assume start_addr < end_addr. */
801 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
803 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
805 if (vma
&& end_addr
<= vma
->vm_start
)
810 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
812 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
815 extern struct vm_area_struct
*find_extend_vma(struct mm_struct
*mm
, unsigned long addr
);
817 extern struct page
* vmalloc_to_page(void *addr
);
818 extern unsigned long vmalloc_to_pfn(void *addr
);
819 extern struct page
* follow_page(struct mm_struct
*mm
, unsigned long address
,
821 extern int check_user_page_readable(struct mm_struct
*mm
, unsigned long address
);
822 int remap_pfn_range(struct vm_area_struct
*, unsigned long,
823 unsigned long, unsigned long, pgprot_t
);
825 #ifdef CONFIG_PROC_FS
826 void __vm_stat_account(struct mm_struct
*, unsigned long, struct file
*, long);
828 static inline void __vm_stat_account(struct mm_struct
*mm
,
829 unsigned long flags
, struct file
*file
, long pages
)
832 #endif /* CONFIG_PROC_FS */
834 static inline void vm_stat_account(struct vm_area_struct
*vma
)
836 __vm_stat_account(vma
->vm_mm
, vma
->vm_flags
, vma
->vm_file
,
840 static inline void vm_stat_unaccount(struct vm_area_struct
*vma
)
842 __vm_stat_account(vma
->vm_mm
, vma
->vm_flags
, vma
->vm_file
,
846 /* update per process rss and vm hiwater data */
847 extern void update_mem_hiwater(struct task_struct
*tsk
);
849 #ifndef CONFIG_DEBUG_PAGEALLOC
851 kernel_map_pages(struct page
*page
, int numpages
, int enable
)
856 extern struct vm_area_struct
*get_gate_vma(struct task_struct
*tsk
);
857 #ifdef __HAVE_ARCH_GATE_AREA
858 int in_gate_area_no_task(unsigned long addr
);
859 int in_gate_area(struct task_struct
*task
, unsigned long addr
);
861 int in_gate_area_no_task(unsigned long addr
);
862 #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
863 #endif /* __HAVE_ARCH_GATE_AREA */
865 /* /proc/<pid>/oom_adj set to -17 protects from the oom-killer */
866 #define OOM_DISABLE -17
868 #endif /* __KERNEL__ */
869 #endif /* _LINUX_MM_H */