4 #include <linux/errno.h>
10 #include <linux/list.h>
11 #include <linux/mmzone.h>
12 #include <linux/rbtree.h>
13 #include <linux/prio_tree.h>
14 #include <linux/atomic.h>
15 #include <linux/debug_locks.h>
16 #include <linux/mm_types.h>
17 #include <linux/range.h>
18 #include <linux/pfn.h>
19 #include <linux/bit_spinlock.h>
20 #include <linux/shrinker.h>
26 struct writeback_control
;
28 #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
29 extern unsigned long max_mapnr
;
32 extern unsigned long num_physpages
;
33 extern unsigned long totalram_pages
;
34 extern void * high_memory
;
35 extern int page_cluster
;
38 extern int sysctl_legacy_va_layout
;
40 #define sysctl_legacy_va_layout 0
44 #include <asm/pgtable.h>
45 #include <asm/processor.h>
47 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
49 /* to align the pointer to the (next) page boundary */
50 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
53 * Linux kernel virtual memory manager primitives.
54 * The idea being to have a "virtual" mm in the same way
55 * we have a virtual fs - giving a cleaner interface to the
56 * mm details, and allowing different kinds of memory mappings
57 * (from shared memory to executable loading to arbitrary
61 extern struct kmem_cache
*vm_area_cachep
;
64 extern struct rb_root nommu_region_tree
;
65 extern struct rw_semaphore nommu_region_sem
;
67 extern unsigned int kobjsize(const void *objp
);
71 * vm_flags in vm_area_struct, see mm_types.h.
73 #define VM_NONE 0x00000000
75 #define VM_READ 0x00000001 /* currently active flags */
76 #define VM_WRITE 0x00000002
77 #define VM_EXEC 0x00000004
78 #define VM_SHARED 0x00000008
80 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
81 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
82 #define VM_MAYWRITE 0x00000020
83 #define VM_MAYEXEC 0x00000040
84 #define VM_MAYSHARE 0x00000080
86 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
87 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
88 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
90 #define VM_EXECUTABLE 0x00001000
91 #define VM_LOCKED 0x00002000
92 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
94 /* Used by sys_madvise() */
95 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
96 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
98 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
99 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
100 #define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */
101 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
102 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
103 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
104 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
105 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
106 #define VM_NODUMP 0x04000000 /* Do not include in the core dump */
108 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
109 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
110 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
111 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
113 #if defined(CONFIG_X86)
114 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
115 #elif defined(CONFIG_PPC)
116 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
117 #elif defined(CONFIG_PARISC)
118 # define VM_GROWSUP VM_ARCH_1
119 #elif defined(CONFIG_IA64)
120 # define VM_GROWSUP VM_ARCH_1
121 #elif !defined(CONFIG_MMU)
122 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
126 # define VM_GROWSUP VM_NONE
129 /* Bits set in the VMA until the stack is in its final location */
130 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
132 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
133 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
136 #ifdef CONFIG_STACK_GROWSUP
137 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
139 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
142 #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
143 #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
144 #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
145 #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
146 #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
149 * Special vmas that are non-mergable, non-mlock()able.
150 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
152 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP)
155 * mapping from the currently active vm_flags protection bits (the
156 * low four bits) to a page protection mask..
158 extern pgprot_t protection_map
[16];
160 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
161 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
162 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
163 #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */
164 #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */
165 #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */
168 * vm_fault is filled by the the pagefault handler and passed to the vma's
169 * ->fault function. The vma's ->fault is responsible for returning a bitmask
170 * of VM_FAULT_xxx flags that give details about how the fault was handled.
172 * pgoff should be used in favour of virtual_address, if possible. If pgoff
173 * is used, one may implement ->remap_pages to get nonlinear mapping support.
176 unsigned int flags
; /* FAULT_FLAG_xxx flags */
177 pgoff_t pgoff
; /* Logical page offset based on vma */
178 void __user
*virtual_address
; /* Faulting virtual address */
180 struct page
*page
; /* ->fault handlers should return a
181 * page here, unless VM_FAULT_NOPAGE
182 * is set (which is also implied by
188 * These are the virtual MM functions - opening of an area, closing and
189 * unmapping it (needed to keep files on disk up-to-date etc), pointer
190 * to the functions called when a no-page or a wp-page exception occurs.
192 struct vm_operations_struct
{
193 void (*open
)(struct vm_area_struct
* area
);
194 void (*close
)(struct vm_area_struct
* area
);
195 int (*fault
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
197 /* notification that a previously read-only page is about to become
198 * writable, if an error is returned it will cause a SIGBUS */
199 int (*page_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
201 /* called by access_process_vm when get_user_pages() fails, typically
202 * for use by special VMAs that can switch between memory and hardware
204 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
205 void *buf
, int len
, int write
);
208 * set_policy() op must add a reference to any non-NULL @new mempolicy
209 * to hold the policy upon return. Caller should pass NULL @new to
210 * remove a policy and fall back to surrounding context--i.e. do not
211 * install a MPOL_DEFAULT policy, nor the task or system default
214 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
217 * get_policy() op must add reference [mpol_get()] to any policy at
218 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
219 * in mm/mempolicy.c will do this automatically.
220 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
221 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
222 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
223 * must return NULL--i.e., do not "fallback" to task or system default
226 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
228 int (*migrate
)(struct vm_area_struct
*vma
, const nodemask_t
*from
,
229 const nodemask_t
*to
, unsigned long flags
);
231 /* called by sys_remap_file_pages() to populate non-linear mapping */
232 int (*remap_pages
)(struct vm_area_struct
*vma
, unsigned long addr
,
233 unsigned long size
, pgoff_t pgoff
);
239 #define page_private(page) ((page)->private)
240 #define set_page_private(page, v) ((page)->private = (v))
243 * FIXME: take this include out, include page-flags.h in
244 * files which need it (119 of them)
246 #include <linux/page-flags.h>
247 #include <linux/huge_mm.h>
250 * Methods to modify the page usage count.
252 * What counts for a page usage:
253 * - cache mapping (page->mapping)
254 * - private data (page->private)
255 * - page mapped in a task's page tables, each mapping
256 * is counted separately
258 * Also, many kernel routines increase the page count before a critical
259 * routine so they can be sure the page doesn't go away from under them.
263 * Drop a ref, return true if the refcount fell to zero (the page has no users)
265 static inline int put_page_testzero(struct page
*page
)
267 VM_BUG_ON(atomic_read(&page
->_count
) == 0);
268 return atomic_dec_and_test(&page
->_count
);
272 * Try to grab a ref unless the page has a refcount of zero, return false if
275 static inline int get_page_unless_zero(struct page
*page
)
277 return atomic_inc_not_zero(&page
->_count
);
280 extern int page_is_ram(unsigned long pfn
);
282 /* Support for virtually mapped pages */
283 struct page
*vmalloc_to_page(const void *addr
);
284 unsigned long vmalloc_to_pfn(const void *addr
);
287 * Determine if an address is within the vmalloc range
289 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
290 * is no special casing required.
292 static inline int is_vmalloc_addr(const void *x
)
295 unsigned long addr
= (unsigned long)x
;
297 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
303 extern int is_vmalloc_or_module_addr(const void *x
);
305 static inline int is_vmalloc_or_module_addr(const void *x
)
311 static inline void compound_lock(struct page
*page
)
313 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
314 VM_BUG_ON(PageSlab(page
));
315 bit_spin_lock(PG_compound_lock
, &page
->flags
);
319 static inline void compound_unlock(struct page
*page
)
321 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
322 VM_BUG_ON(PageSlab(page
));
323 bit_spin_unlock(PG_compound_lock
, &page
->flags
);
327 static inline unsigned long compound_lock_irqsave(struct page
*page
)
329 unsigned long uninitialized_var(flags
);
330 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
331 local_irq_save(flags
);
337 static inline void compound_unlock_irqrestore(struct page
*page
,
340 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
341 compound_unlock(page
);
342 local_irq_restore(flags
);
346 static inline struct page
*compound_head(struct page
*page
)
348 if (unlikely(PageTail(page
)))
349 return page
->first_page
;
354 * The atomic page->_mapcount, starts from -1: so that transitions
355 * both from it and to it can be tracked, using atomic_inc_and_test
356 * and atomic_add_negative(-1).
358 static inline void reset_page_mapcount(struct page
*page
)
360 atomic_set(&(page
)->_mapcount
, -1);
363 static inline int page_mapcount(struct page
*page
)
365 return atomic_read(&(page
)->_mapcount
) + 1;
368 static inline int page_count(struct page
*page
)
370 return atomic_read(&compound_head(page
)->_count
);
373 static inline void get_huge_page_tail(struct page
*page
)
376 * __split_huge_page_refcount() cannot run
379 VM_BUG_ON(page_mapcount(page
) < 0);
380 VM_BUG_ON(atomic_read(&page
->_count
) != 0);
381 atomic_inc(&page
->_mapcount
);
384 extern bool __get_page_tail(struct page
*page
);
386 static inline void get_page(struct page
*page
)
388 if (unlikely(PageTail(page
)))
389 if (likely(__get_page_tail(page
)))
392 * Getting a normal page or the head of a compound page
393 * requires to already have an elevated page->_count.
395 VM_BUG_ON(atomic_read(&page
->_count
) <= 0);
396 atomic_inc(&page
->_count
);
399 static inline struct page
*virt_to_head_page(const void *x
)
401 struct page
*page
= virt_to_page(x
);
402 return compound_head(page
);
406 * Setup the page count before being freed into the page allocator for
407 * the first time (boot or memory hotplug)
409 static inline void init_page_count(struct page
*page
)
411 atomic_set(&page
->_count
, 1);
415 * PageBuddy() indicate that the page is free and in the buddy system
416 * (see mm/page_alloc.c).
418 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
419 * -2 so that an underflow of the page_mapcount() won't be mistaken
420 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
421 * efficiently by most CPU architectures.
423 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
425 static inline int PageBuddy(struct page
*page
)
427 return atomic_read(&page
->_mapcount
) == PAGE_BUDDY_MAPCOUNT_VALUE
;
430 static inline void __SetPageBuddy(struct page
*page
)
432 VM_BUG_ON(atomic_read(&page
->_mapcount
) != -1);
433 atomic_set(&page
->_mapcount
, PAGE_BUDDY_MAPCOUNT_VALUE
);
436 static inline void __ClearPageBuddy(struct page
*page
)
438 VM_BUG_ON(!PageBuddy(page
));
439 atomic_set(&page
->_mapcount
, -1);
442 void put_page(struct page
*page
);
443 void put_pages_list(struct list_head
*pages
);
445 void split_page(struct page
*page
, unsigned int order
);
446 int split_free_page(struct page
*page
);
449 * Compound pages have a destructor function. Provide a
450 * prototype for that function and accessor functions.
451 * These are _only_ valid on the head of a PG_compound page.
453 typedef void compound_page_dtor(struct page
*);
455 static inline void set_compound_page_dtor(struct page
*page
,
456 compound_page_dtor
*dtor
)
458 page
[1].lru
.next
= (void *)dtor
;
461 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
463 return (compound_page_dtor
*)page
[1].lru
.next
;
466 static inline int compound_order(struct page
*page
)
470 return (unsigned long)page
[1].lru
.prev
;
473 static inline int compound_trans_order(struct page
*page
)
481 flags
= compound_lock_irqsave(page
);
482 order
= compound_order(page
);
483 compound_unlock_irqrestore(page
, flags
);
487 static inline void set_compound_order(struct page
*page
, unsigned long order
)
489 page
[1].lru
.prev
= (void *)order
;
494 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
495 * servicing faults for write access. In the normal case, do always want
496 * pte_mkwrite. But get_user_pages can cause write faults for mappings
497 * that do not have writing enabled, when used by access_process_vm.
499 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
501 if (likely(vma
->vm_flags
& VM_WRITE
))
502 pte
= pte_mkwrite(pte
);
508 * Multiple processes may "see" the same page. E.g. for untouched
509 * mappings of /dev/null, all processes see the same page full of
510 * zeroes, and text pages of executables and shared libraries have
511 * only one copy in memory, at most, normally.
513 * For the non-reserved pages, page_count(page) denotes a reference count.
514 * page_count() == 0 means the page is free. page->lru is then used for
515 * freelist management in the buddy allocator.
516 * page_count() > 0 means the page has been allocated.
518 * Pages are allocated by the slab allocator in order to provide memory
519 * to kmalloc and kmem_cache_alloc. In this case, the management of the
520 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
521 * unless a particular usage is carefully commented. (the responsibility of
522 * freeing the kmalloc memory is the caller's, of course).
524 * A page may be used by anyone else who does a __get_free_page().
525 * In this case, page_count still tracks the references, and should only
526 * be used through the normal accessor functions. The top bits of page->flags
527 * and page->virtual store page management information, but all other fields
528 * are unused and could be used privately, carefully. The management of this
529 * page is the responsibility of the one who allocated it, and those who have
530 * subsequently been given references to it.
532 * The other pages (we may call them "pagecache pages") are completely
533 * managed by the Linux memory manager: I/O, buffers, swapping etc.
534 * The following discussion applies only to them.
536 * A pagecache page contains an opaque `private' member, which belongs to the
537 * page's address_space. Usually, this is the address of a circular list of
538 * the page's disk buffers. PG_private must be set to tell the VM to call
539 * into the filesystem to release these pages.
541 * A page may belong to an inode's memory mapping. In this case, page->mapping
542 * is the pointer to the inode, and page->index is the file offset of the page,
543 * in units of PAGE_CACHE_SIZE.
545 * If pagecache pages are not associated with an inode, they are said to be
546 * anonymous pages. These may become associated with the swapcache, and in that
547 * case PG_swapcache is set, and page->private is an offset into the swapcache.
549 * In either case (swapcache or inode backed), the pagecache itself holds one
550 * reference to the page. Setting PG_private should also increment the
551 * refcount. The each user mapping also has a reference to the page.
553 * The pagecache pages are stored in a per-mapping radix tree, which is
554 * rooted at mapping->page_tree, and indexed by offset.
555 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
556 * lists, we instead now tag pages as dirty/writeback in the radix tree.
558 * All pagecache pages may be subject to I/O:
559 * - inode pages may need to be read from disk,
560 * - inode pages which have been modified and are MAP_SHARED may need
561 * to be written back to the inode on disk,
562 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
563 * modified may need to be swapped out to swap space and (later) to be read
568 * The zone field is never updated after free_area_init_core()
569 * sets it, so none of the operations on it need to be atomic.
574 * page->flags layout:
576 * There are three possibilities for how page->flags get
577 * laid out. The first is for the normal case, without
578 * sparsemem. The second is for sparsemem when there is
579 * plenty of space for node and section. The last is when
580 * we have run out of space and have to fall back to an
581 * alternate (slower) way of determining the node.
583 * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS |
584 * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS |
585 * classic sparse no space for node: | SECTION | ZONE | ... | FLAGS |
587 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
588 #define SECTIONS_WIDTH SECTIONS_SHIFT
590 #define SECTIONS_WIDTH 0
593 #define ZONES_WIDTH ZONES_SHIFT
595 #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS
596 #define NODES_WIDTH NODES_SHIFT
598 #ifdef CONFIG_SPARSEMEM_VMEMMAP
599 #error "Vmemmap: No space for nodes field in page flags"
601 #define NODES_WIDTH 0
604 /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */
605 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
606 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
607 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
610 * We are going to use the flags for the page to node mapping if its in
611 * there. This includes the case where there is no node, so it is implicit.
613 #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0)
614 #define NODE_NOT_IN_PAGE_FLAGS
618 * Define the bit shifts to access each section. For non-existent
619 * sections we define the shift as 0; that plus a 0 mask ensures
620 * the compiler will optimise away reference to them.
622 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
623 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
624 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
626 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
627 #ifdef NODE_NOT_IN_PAGE_FLAGS
628 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
629 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
630 SECTIONS_PGOFF : ZONES_PGOFF)
632 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
633 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
634 NODES_PGOFF : ZONES_PGOFF)
637 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
639 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
640 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
643 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
644 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
645 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
646 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
648 static inline enum zone_type
page_zonenum(const struct page
*page
)
650 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
654 * The identification function is only used by the buddy allocator for
655 * determining if two pages could be buddies. We are not really
656 * identifying a zone since we could be using a the section number
657 * id if we have not node id available in page flags.
658 * We guarantee only that it will return the same value for two
659 * combinable pages in a zone.
661 static inline int page_zone_id(struct page
*page
)
663 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
666 static inline int zone_to_nid(struct zone
*zone
)
675 #ifdef NODE_NOT_IN_PAGE_FLAGS
676 extern int page_to_nid(const struct page
*page
);
678 static inline int page_to_nid(const struct page
*page
)
680 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
684 static inline struct zone
*page_zone(const struct page
*page
)
686 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
689 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
690 static inline void set_page_section(struct page
*page
, unsigned long section
)
692 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
693 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
696 static inline unsigned long page_to_section(const struct page
*page
)
698 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
702 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
704 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
705 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
708 static inline void set_page_node(struct page
*page
, unsigned long node
)
710 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
711 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
714 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
715 unsigned long node
, unsigned long pfn
)
717 set_page_zone(page
, zone
);
718 set_page_node(page
, node
);
719 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
720 set_page_section(page
, pfn_to_section_nr(pfn
));
725 * Some inline functions in vmstat.h depend on page_zone()
727 #include <linux/vmstat.h>
729 static __always_inline
void *lowmem_page_address(const struct page
*page
)
731 return __va(PFN_PHYS(page_to_pfn(page
)));
734 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
735 #define HASHED_PAGE_VIRTUAL
738 #if defined(WANT_PAGE_VIRTUAL)
739 #define page_address(page) ((page)->virtual)
740 #define set_page_address(page, address) \
742 (page)->virtual = (address); \
744 #define page_address_init() do { } while(0)
747 #if defined(HASHED_PAGE_VIRTUAL)
748 void *page_address(const struct page
*page
);
749 void set_page_address(struct page
*page
, void *virtual);
750 void page_address_init(void);
753 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
754 #define page_address(page) lowmem_page_address(page)
755 #define set_page_address(page, address) do { } while(0)
756 #define page_address_init() do { } while(0)
760 * On an anonymous page mapped into a user virtual memory area,
761 * page->mapping points to its anon_vma, not to a struct address_space;
762 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
764 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
765 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
766 * and then page->mapping points, not to an anon_vma, but to a private
767 * structure which KSM associates with that merged page. See ksm.h.
769 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
771 * Please note that, confusingly, "page_mapping" refers to the inode
772 * address_space which maps the page from disk; whereas "page_mapped"
773 * refers to user virtual address space into which the page is mapped.
775 #define PAGE_MAPPING_ANON 1
776 #define PAGE_MAPPING_KSM 2
777 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
779 extern struct address_space swapper_space
;
780 static inline struct address_space
*page_mapping(struct page
*page
)
782 struct address_space
*mapping
= page
->mapping
;
784 VM_BUG_ON(PageSlab(page
));
785 if (unlikely(PageSwapCache(page
)))
786 mapping
= &swapper_space
;
787 else if ((unsigned long)mapping
& PAGE_MAPPING_ANON
)
792 /* Neutral page->mapping pointer to address_space or anon_vma or other */
793 static inline void *page_rmapping(struct page
*page
)
795 return (void *)((unsigned long)page
->mapping
& ~PAGE_MAPPING_FLAGS
);
798 extern struct address_space
*__page_file_mapping(struct page
*);
801 struct address_space
*page_file_mapping(struct page
*page
)
803 if (unlikely(PageSwapCache(page
)))
804 return __page_file_mapping(page
);
806 return page
->mapping
;
809 static inline int PageAnon(struct page
*page
)
811 return ((unsigned long)page
->mapping
& PAGE_MAPPING_ANON
) != 0;
815 * Return the pagecache index of the passed page. Regular pagecache pages
816 * use ->index whereas swapcache pages use ->private
818 static inline pgoff_t
page_index(struct page
*page
)
820 if (unlikely(PageSwapCache(page
)))
821 return page_private(page
);
825 extern pgoff_t
__page_file_index(struct page
*page
);
828 * Return the file index of the page. Regular pagecache pages use ->index
829 * whereas swapcache pages use swp_offset(->private)
831 static inline pgoff_t
page_file_index(struct page
*page
)
833 if (unlikely(PageSwapCache(page
)))
834 return __page_file_index(page
);
840 * Return true if this page is mapped into pagetables.
842 static inline int page_mapped(struct page
*page
)
844 return atomic_read(&(page
)->_mapcount
) >= 0;
848 * Different kinds of faults, as returned by handle_mm_fault().
849 * Used to decide whether a process gets delivered SIGBUS or
850 * just gets major/minor fault counters bumped up.
853 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
855 #define VM_FAULT_OOM 0x0001
856 #define VM_FAULT_SIGBUS 0x0002
857 #define VM_FAULT_MAJOR 0x0004
858 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
859 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
860 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
862 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
863 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
864 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
866 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
868 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
869 VM_FAULT_HWPOISON_LARGE)
871 /* Encode hstate index for a hwpoisoned large page */
872 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
873 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
876 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
878 extern void pagefault_out_of_memory(void);
880 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
883 * Flags passed to show_mem() and show_free_areas() to suppress output in
886 #define SHOW_MEM_FILTER_NODES (0x0001u) /* filter disallowed nodes */
888 extern void show_free_areas(unsigned int flags
);
889 extern bool skip_free_areas_node(unsigned int flags
, int nid
);
891 int shmem_zero_setup(struct vm_area_struct
*);
893 extern int can_do_mlock(void);
894 extern int user_shm_lock(size_t, struct user_struct
*);
895 extern void user_shm_unlock(size_t, struct user_struct
*);
898 * Parameter block passed down to zap_pte_range in exceptional cases.
901 struct vm_area_struct
*nonlinear_vma
; /* Check page->index if set */
902 struct address_space
*check_mapping
; /* Check page->mapping if set */
903 pgoff_t first_index
; /* Lowest page->index to unmap */
904 pgoff_t last_index
; /* Highest page->index to unmap */
907 struct page
*vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
910 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
912 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
913 unsigned long size
, struct zap_details
*);
914 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
915 unsigned long start
, unsigned long end
);
918 * mm_walk - callbacks for walk_page_range
919 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
920 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
921 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
922 * this handler is required to be able to handle
923 * pmd_trans_huge() pmds. They may simply choose to
924 * split_huge_page() instead of handling it explicitly.
925 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
926 * @pte_hole: if set, called for each hole at all levels
927 * @hugetlb_entry: if set, called for each hugetlb entry
928 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
931 * (see walk_page_range for more details)
934 int (*pgd_entry
)(pgd_t
*, unsigned long, unsigned long, struct mm_walk
*);
935 int (*pud_entry
)(pud_t
*, unsigned long, unsigned long, struct mm_walk
*);
936 int (*pmd_entry
)(pmd_t
*, unsigned long, unsigned long, struct mm_walk
*);
937 int (*pte_entry
)(pte_t
*, unsigned long, unsigned long, struct mm_walk
*);
938 int (*pte_hole
)(unsigned long, unsigned long, struct mm_walk
*);
939 int (*hugetlb_entry
)(pte_t
*, unsigned long,
940 unsigned long, unsigned long, struct mm_walk
*);
941 struct mm_struct
*mm
;
945 int walk_page_range(unsigned long addr
, unsigned long end
,
946 struct mm_walk
*walk
);
947 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
948 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
949 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
950 struct vm_area_struct
*vma
);
951 void unmap_mapping_range(struct address_space
*mapping
,
952 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
953 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
955 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
956 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
957 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
958 void *buf
, int len
, int write
);
960 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
961 loff_t
const holebegin
, loff_t
const holelen
)
963 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
966 extern void truncate_pagecache(struct inode
*inode
, loff_t old
, loff_t
new);
967 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
968 extern int vmtruncate(struct inode
*inode
, loff_t offset
);
969 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
970 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
971 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
972 int invalidate_inode_page(struct page
*page
);
975 extern int handle_mm_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
976 unsigned long address
, unsigned int flags
);
977 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
978 unsigned long address
, unsigned int fault_flags
);
980 static inline int handle_mm_fault(struct mm_struct
*mm
,
981 struct vm_area_struct
*vma
, unsigned long address
,
984 /* should never happen if there's no MMU */
986 return VM_FAULT_SIGBUS
;
988 static inline int fixup_user_fault(struct task_struct
*tsk
,
989 struct mm_struct
*mm
, unsigned long address
,
990 unsigned int fault_flags
)
992 /* should never happen if there's no MMU */
998 extern int make_pages_present(unsigned long addr
, unsigned long end
);
999 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
1000 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1001 void *buf
, int len
, int write
);
1003 int __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1004 unsigned long start
, int len
, unsigned int foll_flags
,
1005 struct page
**pages
, struct vm_area_struct
**vmas
,
1007 int get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1008 unsigned long start
, int nr_pages
, int write
, int force
,
1009 struct page
**pages
, struct vm_area_struct
**vmas
);
1010 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1011 struct page
**pages
);
1013 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1014 struct page
**pages
);
1015 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1016 struct page
*get_dump_page(unsigned long addr
);
1018 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1019 extern void do_invalidatepage(struct page
*page
, unsigned long offset
);
1021 int __set_page_dirty_nobuffers(struct page
*page
);
1022 int __set_page_dirty_no_writeback(struct page
*page
);
1023 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1025 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1026 void account_page_writeback(struct page
*page
);
1027 int set_page_dirty(struct page
*page
);
1028 int set_page_dirty_lock(struct page
*page
);
1029 int clear_page_dirty_for_io(struct page
*page
);
1031 /* Is the vma a continuation of the stack vma above it? */
1032 static inline int vma_growsdown(struct vm_area_struct
*vma
, unsigned long addr
)
1034 return vma
&& (vma
->vm_end
== addr
) && (vma
->vm_flags
& VM_GROWSDOWN
);
1037 static inline int stack_guard_page_start(struct vm_area_struct
*vma
,
1040 return (vma
->vm_flags
& VM_GROWSDOWN
) &&
1041 (vma
->vm_start
== addr
) &&
1042 !vma_growsdown(vma
->vm_prev
, addr
);
1045 /* Is the vma a continuation of the stack vma below it? */
1046 static inline int vma_growsup(struct vm_area_struct
*vma
, unsigned long addr
)
1048 return vma
&& (vma
->vm_start
== addr
) && (vma
->vm_flags
& VM_GROWSUP
);
1051 static inline int stack_guard_page_end(struct vm_area_struct
*vma
,
1054 return (vma
->vm_flags
& VM_GROWSUP
) &&
1055 (vma
->vm_end
== addr
) &&
1056 !vma_growsup(vma
->vm_next
, addr
);
1060 vm_is_stack(struct task_struct
*task
, struct vm_area_struct
*vma
, int in_group
);
1062 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1063 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1064 unsigned long new_addr
, unsigned long len
);
1065 extern unsigned long do_mremap(unsigned long addr
,
1066 unsigned long old_len
, unsigned long new_len
,
1067 unsigned long flags
, unsigned long new_addr
);
1068 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1069 struct vm_area_struct
**pprev
, unsigned long start
,
1070 unsigned long end
, unsigned long newflags
);
1073 * doesn't attempt to fault and will return short.
1075 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1076 struct page
**pages
);
1078 * per-process(per-mm_struct) statistics.
1080 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1082 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1084 #ifdef SPLIT_RSS_COUNTING
1086 * counter is updated in asynchronous manner and may go to minus.
1087 * But it's never be expected number for users.
1092 return (unsigned long)val
;
1095 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1097 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1100 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1102 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1105 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1107 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1110 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1112 return get_mm_counter(mm
, MM_FILEPAGES
) +
1113 get_mm_counter(mm
, MM_ANONPAGES
);
1116 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1118 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1121 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1123 return max(mm
->hiwater_vm
, mm
->total_vm
);
1126 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1128 unsigned long _rss
= get_mm_rss(mm
);
1130 if ((mm
)->hiwater_rss
< _rss
)
1131 (mm
)->hiwater_rss
= _rss
;
1134 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1136 if (mm
->hiwater_vm
< mm
->total_vm
)
1137 mm
->hiwater_vm
= mm
->total_vm
;
1140 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1141 struct mm_struct
*mm
)
1143 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1145 if (*maxrss
< hiwater_rss
)
1146 *maxrss
= hiwater_rss
;
1149 #if defined(SPLIT_RSS_COUNTING)
1150 void sync_mm_rss(struct mm_struct
*mm
);
1152 static inline void sync_mm_rss(struct mm_struct
*mm
)
1157 int vma_wants_writenotify(struct vm_area_struct
*vma
);
1159 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1161 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1165 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1169 #ifdef __PAGETABLE_PUD_FOLDED
1170 static inline int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1171 unsigned long address
)
1176 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1179 #ifdef __PAGETABLE_PMD_FOLDED
1180 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1181 unsigned long address
)
1186 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1189 int __pte_alloc(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1190 pmd_t
*pmd
, unsigned long address
);
1191 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1194 * The following ifdef needed to get the 4level-fixup.h header to work.
1195 * Remove it when 4level-fixup.h has been removed.
1197 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1198 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
1200 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
1201 NULL
: pud_offset(pgd
, address
);
1204 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1206 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1207 NULL
: pmd_offset(pud
, address
);
1209 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1211 #if USE_SPLIT_PTLOCKS
1213 * We tuck a spinlock to guard each pagetable page into its struct page,
1214 * at page->private, with BUILD_BUG_ON to make sure that this will not
1215 * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
1216 * When freeing, reset page->mapping so free_pages_check won't complain.
1218 #define __pte_lockptr(page) &((page)->ptl)
1219 #define pte_lock_init(_page) do { \
1220 spin_lock_init(__pte_lockptr(_page)); \
1222 #define pte_lock_deinit(page) ((page)->mapping = NULL)
1223 #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
1224 #else /* !USE_SPLIT_PTLOCKS */
1226 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1228 #define pte_lock_init(page) do {} while (0)
1229 #define pte_lock_deinit(page) do {} while (0)
1230 #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
1231 #endif /* USE_SPLIT_PTLOCKS */
1233 static inline void pgtable_page_ctor(struct page
*page
)
1235 pte_lock_init(page
);
1236 inc_zone_page_state(page
, NR_PAGETABLE
);
1239 static inline void pgtable_page_dtor(struct page
*page
)
1241 pte_lock_deinit(page
);
1242 dec_zone_page_state(page
, NR_PAGETABLE
);
1245 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1247 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1248 pte_t *__pte = pte_offset_map(pmd, address); \
1254 #define pte_unmap_unlock(pte, ptl) do { \
1259 #define pte_alloc_map(mm, vma, pmd, address) \
1260 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1262 NULL: pte_offset_map(pmd, address))
1264 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1265 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1267 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1269 #define pte_alloc_kernel(pmd, address) \
1270 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1271 NULL: pte_offset_kernel(pmd, address))
1273 extern void free_area_init(unsigned long * zones_size
);
1274 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1275 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1276 extern void free_initmem(void);
1278 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1280 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1281 * zones, allocate the backing mem_map and account for memory holes in a more
1282 * architecture independent manner. This is a substitute for creating the
1283 * zone_sizes[] and zholes_size[] arrays and passing them to
1284 * free_area_init_node()
1286 * An architecture is expected to register range of page frames backed by
1287 * physical memory with memblock_add[_node]() before calling
1288 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1289 * usage, an architecture is expected to do something like
1291 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1293 * for_each_valid_physical_page_range()
1294 * memblock_add_node(base, size, nid)
1295 * free_area_init_nodes(max_zone_pfns);
1297 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1298 * registered physical page range. Similarly
1299 * sparse_memory_present_with_active_regions() calls memory_present() for
1300 * each range when SPARSEMEM is enabled.
1302 * See mm/page_alloc.c for more information on each function exposed by
1303 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1305 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1306 unsigned long node_map_pfn_alignment(void);
1307 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1308 unsigned long end_pfn
);
1309 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1310 unsigned long end_pfn
);
1311 extern void get_pfn_range_for_nid(unsigned int nid
,
1312 unsigned long *start_pfn
, unsigned long *end_pfn
);
1313 extern unsigned long find_min_pfn_with_active_regions(void);
1314 extern void free_bootmem_with_active_regions(int nid
,
1315 unsigned long max_low_pfn
);
1316 extern void sparse_memory_present_with_active_regions(int nid
);
1318 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1320 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1321 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1322 static inline int __early_pfn_to_nid(unsigned long pfn
)
1327 /* please see mm/page_alloc.c */
1328 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1329 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
1330 /* there is a per-arch backend function. */
1331 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
);
1332 #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
1335 extern void set_dma_reserve(unsigned long new_dma_reserve
);
1336 extern void memmap_init_zone(unsigned long, int, unsigned long,
1337 unsigned long, enum memmap_context
);
1338 extern void setup_per_zone_wmarks(void);
1339 extern int __meminit
init_per_zone_wmark_min(void);
1340 extern void mem_init(void);
1341 extern void __init
mmap_init(void);
1342 extern void show_mem(unsigned int flags
);
1343 extern void si_meminfo(struct sysinfo
* val
);
1344 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
1345 extern int after_bootmem
;
1347 extern __printf(3, 4)
1348 void warn_alloc_failed(gfp_t gfp_mask
, int order
, const char *fmt
, ...);
1350 extern void setup_per_cpu_pageset(void);
1352 extern void zone_pcp_update(struct zone
*zone
);
1353 extern void zone_pcp_reset(struct zone
*zone
);
1356 extern atomic_long_t mmap_pages_allocated
;
1357 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
1360 void vma_prio_tree_add(struct vm_area_struct
*, struct vm_area_struct
*old
);
1361 void vma_prio_tree_insert(struct vm_area_struct
*, struct prio_tree_root
*);
1362 void vma_prio_tree_remove(struct vm_area_struct
*, struct prio_tree_root
*);
1363 struct vm_area_struct
*vma_prio_tree_next(struct vm_area_struct
*vma
,
1364 struct prio_tree_iter
*iter
);
1366 #define vma_prio_tree_foreach(vma, iter, root, begin, end) \
1367 for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \
1368 (vma = vma_prio_tree_next(vma, iter)); )
1370 static inline void vma_nonlinear_insert(struct vm_area_struct
*vma
,
1371 struct list_head
*list
)
1373 vma
->shared
.vm_set
.parent
= NULL
;
1374 list_add_tail(&vma
->shared
.vm_set
.list
, list
);
1378 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
1379 extern int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
1380 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
1381 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
1382 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
1383 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
1384 struct mempolicy
*);
1385 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
1386 extern int split_vma(struct mm_struct
*,
1387 struct vm_area_struct
*, unsigned long addr
, int new_below
);
1388 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
1389 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
1390 struct rb_node
**, struct rb_node
*);
1391 extern void unlink_file_vma(struct vm_area_struct
*);
1392 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
1393 unsigned long addr
, unsigned long len
, pgoff_t pgoff
);
1394 extern void exit_mmap(struct mm_struct
*);
1396 extern int mm_take_all_locks(struct mm_struct
*mm
);
1397 extern void mm_drop_all_locks(struct mm_struct
*mm
);
1399 /* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */
1400 extern void added_exe_file_vma(struct mm_struct
*mm
);
1401 extern void removed_exe_file_vma(struct mm_struct
*mm
);
1402 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
1403 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
1405 extern int may_expand_vm(struct mm_struct
*mm
, unsigned long npages
);
1406 extern int install_special_mapping(struct mm_struct
*mm
,
1407 unsigned long addr
, unsigned long len
,
1408 unsigned long flags
, struct page
**pages
);
1410 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1412 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
1413 unsigned long len
, unsigned long flags
,
1414 vm_flags_t vm_flags
, unsigned long pgoff
);
1415 extern unsigned long do_mmap_pgoff(struct file
*, unsigned long,
1416 unsigned long, unsigned long,
1417 unsigned long, unsigned long);
1418 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
1420 /* These take the mm semaphore themselves */
1421 extern unsigned long vm_brk(unsigned long, unsigned long);
1422 extern int vm_munmap(unsigned long, size_t);
1423 extern unsigned long vm_mmap(struct file
*, unsigned long,
1424 unsigned long, unsigned long,
1425 unsigned long, unsigned long);
1428 extern void truncate_inode_pages(struct address_space
*, loff_t
);
1429 extern void truncate_inode_pages_range(struct address_space
*,
1430 loff_t lstart
, loff_t lend
);
1432 /* generic vm_area_ops exported for stackable file systems */
1433 extern int filemap_fault(struct vm_area_struct
*, struct vm_fault
*);
1434 extern int filemap_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1436 /* mm/page-writeback.c */
1437 int write_one_page(struct page
*page
, int wait
);
1438 void task_dirty_inc(struct task_struct
*tsk
);
1441 #define VM_MAX_READAHEAD 128 /* kbytes */
1442 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1444 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
1445 pgoff_t offset
, unsigned long nr_to_read
);
1447 void page_cache_sync_readahead(struct address_space
*mapping
,
1448 struct file_ra_state
*ra
,
1451 unsigned long size
);
1453 void page_cache_async_readahead(struct address_space
*mapping
,
1454 struct file_ra_state
*ra
,
1458 unsigned long size
);
1460 unsigned long max_sane_readahead(unsigned long nr
);
1461 unsigned long ra_submit(struct file_ra_state
*ra
,
1462 struct address_space
*mapping
,
1465 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1466 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
1468 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1469 extern int expand_downwards(struct vm_area_struct
*vma
,
1470 unsigned long address
);
1472 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
1474 #define expand_upwards(vma, address) do { } while (0)
1477 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1478 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
1479 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
1480 struct vm_area_struct
**pprev
);
1482 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1483 NULL if none. Assume start_addr < end_addr. */
1484 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
1486 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
1488 if (vma
&& end_addr
<= vma
->vm_start
)
1493 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
1495 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
1498 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1499 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
1500 unsigned long vm_start
, unsigned long vm_end
)
1502 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
1504 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
1511 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
1513 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
1519 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
1520 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
1521 unsigned long pfn
, unsigned long size
, pgprot_t
);
1522 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
1523 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
1525 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
1528 struct page
*follow_page(struct vm_area_struct
*, unsigned long address
,
1529 unsigned int foll_flags
);
1530 #define FOLL_WRITE 0x01 /* check pte is writable */
1531 #define FOLL_TOUCH 0x02 /* mark page accessed */
1532 #define FOLL_GET 0x04 /* do get_page on page */
1533 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1534 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1535 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
1536 * and return without waiting upon it */
1537 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
1538 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
1539 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
1541 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
1543 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
1544 unsigned long size
, pte_fn_t fn
, void *data
);
1546 #ifdef CONFIG_PROC_FS
1547 void vm_stat_account(struct mm_struct
*, unsigned long, struct file
*, long);
1549 static inline void vm_stat_account(struct mm_struct
*mm
,
1550 unsigned long flags
, struct file
*file
, long pages
)
1552 mm
->total_vm
+= pages
;
1554 #endif /* CONFIG_PROC_FS */
1556 #ifdef CONFIG_DEBUG_PAGEALLOC
1557 extern void kernel_map_pages(struct page
*page
, int numpages
, int enable
);
1558 #ifdef CONFIG_HIBERNATION
1559 extern bool kernel_page_present(struct page
*page
);
1560 #endif /* CONFIG_HIBERNATION */
1563 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
1564 #ifdef CONFIG_HIBERNATION
1565 static inline bool kernel_page_present(struct page
*page
) { return true; }
1566 #endif /* CONFIG_HIBERNATION */
1569 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
1570 #ifdef __HAVE_ARCH_GATE_AREA
1571 int in_gate_area_no_mm(unsigned long addr
);
1572 int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
1574 int in_gate_area_no_mm(unsigned long addr
);
1575 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
1576 #endif /* __HAVE_ARCH_GATE_AREA */
1578 int drop_caches_sysctl_handler(struct ctl_table
*, int,
1579 void __user
*, size_t *, loff_t
*);
1580 unsigned long shrink_slab(struct shrink_control
*shrink
,
1581 unsigned long nr_pages_scanned
,
1582 unsigned long lru_pages
);
1585 #define randomize_va_space 0
1587 extern int randomize_va_space
;
1590 const char * arch_vma_name(struct vm_area_struct
*vma
);
1591 void print_vma_addr(char *prefix
, unsigned long rip
);
1593 void sparse_mem_maps_populate_node(struct page
**map_map
,
1594 unsigned long pnum_begin
,
1595 unsigned long pnum_end
,
1596 unsigned long map_count
,
1599 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
1600 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
1601 pud_t
*vmemmap_pud_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
1602 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
1603 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
1604 void *vmemmap_alloc_block(unsigned long size
, int node
);
1605 void *vmemmap_alloc_block_buf(unsigned long size
, int node
);
1606 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
1607 int vmemmap_populate_basepages(struct page
*start_page
,
1608 unsigned long pages
, int node
);
1609 int vmemmap_populate(struct page
*start_page
, unsigned long pages
, int node
);
1610 void vmemmap_populate_print_last(void);
1614 MF_COUNT_INCREASED
= 1 << 0,
1615 MF_ACTION_REQUIRED
= 1 << 1,
1616 MF_MUST_KILL
= 1 << 2,
1618 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
1619 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
1620 extern int unpoison_memory(unsigned long pfn
);
1621 extern int sysctl_memory_failure_early_kill
;
1622 extern int sysctl_memory_failure_recovery
;
1623 extern void shake_page(struct page
*p
, int access
);
1624 extern atomic_long_t mce_bad_pages
;
1625 extern int soft_offline_page(struct page
*page
, int flags
);
1627 extern void dump_page(struct page
*page
);
1629 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
1630 extern void clear_huge_page(struct page
*page
,
1632 unsigned int pages_per_huge_page
);
1633 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
1634 unsigned long addr
, struct vm_area_struct
*vma
,
1635 unsigned int pages_per_huge_page
);
1636 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
1638 #ifdef CONFIG_DEBUG_PAGEALLOC
1639 extern unsigned int _debug_guardpage_minorder
;
1641 static inline unsigned int debug_guardpage_minorder(void)
1643 return _debug_guardpage_minorder
;
1646 static inline bool page_is_guard(struct page
*page
)
1648 return test_bit(PAGE_DEBUG_FLAG_GUARD
, &page
->debug_flags
);
1651 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
1652 static inline bool page_is_guard(struct page
*page
) { return false; }
1653 #endif /* CONFIG_DEBUG_PAGEALLOC */
1655 #endif /* __KERNEL__ */
1656 #endif /* _LINUX_MM_H */