4 #include <linux/errno.h>
8 #include <linux/mmdebug.h>
10 #include <linux/bug.h>
11 #include <linux/list.h>
12 #include <linux/mmzone.h>
13 #include <linux/rbtree.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>
24 struct anon_vma_chain
;
27 struct writeback_control
;
29 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
30 extern unsigned long max_mapnr
;
32 static inline void set_max_mapnr(unsigned long limit
)
37 static inline void set_max_mapnr(unsigned long limit
) { }
40 extern unsigned long totalram_pages
;
41 extern void * high_memory
;
42 extern int page_cluster
;
45 extern int sysctl_legacy_va_layout
;
47 #define sysctl_legacy_va_layout 0
51 #include <asm/pgtable.h>
52 #include <asm/processor.h>
55 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
58 extern unsigned long sysctl_user_reserve_kbytes
;
59 extern unsigned long sysctl_admin_reserve_kbytes
;
61 extern int sysctl_overcommit_memory
;
62 extern int sysctl_overcommit_ratio
;
63 extern unsigned long sysctl_overcommit_kbytes
;
65 extern int overcommit_ratio_handler(struct ctl_table
*, int, void __user
*,
67 extern int overcommit_kbytes_handler(struct ctl_table
*, int, void __user
*,
70 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
72 /* to align the pointer to the (next) page boundary */
73 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
75 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
76 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
79 * Linux kernel virtual memory manager primitives.
80 * The idea being to have a "virtual" mm in the same way
81 * we have a virtual fs - giving a cleaner interface to the
82 * mm details, and allowing different kinds of memory mappings
83 * (from shared memory to executable loading to arbitrary
87 extern struct kmem_cache
*vm_area_cachep
;
90 extern struct rb_root nommu_region_tree
;
91 extern struct rw_semaphore nommu_region_sem
;
93 extern unsigned int kobjsize(const void *objp
);
97 * vm_flags in vm_area_struct, see mm_types.h.
99 #define VM_NONE 0x00000000
101 #define VM_READ 0x00000001 /* currently active flags */
102 #define VM_WRITE 0x00000002
103 #define VM_EXEC 0x00000004
104 #define VM_SHARED 0x00000008
106 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
107 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
108 #define VM_MAYWRITE 0x00000020
109 #define VM_MAYEXEC 0x00000040
110 #define VM_MAYSHARE 0x00000080
112 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
113 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
114 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
116 #define VM_LOCKED 0x00002000
117 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
119 /* Used by sys_madvise() */
120 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
121 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
123 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
124 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
125 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
126 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
127 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
128 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
129 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
130 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
132 #ifdef CONFIG_MEM_SOFT_DIRTY
133 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
135 # define VM_SOFTDIRTY 0
138 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
139 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
140 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
141 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
143 #if defined(CONFIG_X86)
144 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
145 #elif defined(CONFIG_PPC)
146 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
147 #elif defined(CONFIG_PARISC)
148 # define VM_GROWSUP VM_ARCH_1
149 #elif defined(CONFIG_METAG)
150 # define VM_GROWSUP VM_ARCH_1
151 #elif defined(CONFIG_IA64)
152 # define VM_GROWSUP VM_ARCH_1
153 #elif !defined(CONFIG_MMU)
154 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
158 # define VM_GROWSUP VM_NONE
161 /* Bits set in the VMA until the stack is in its final location */
162 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
164 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
165 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
168 #ifdef CONFIG_STACK_GROWSUP
169 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
171 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
175 * Special vmas that are non-mergable, non-mlock()able.
176 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
178 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
180 /* This mask defines which mm->def_flags a process can inherit its parent */
181 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
184 * mapping from the currently active vm_flags protection bits (the
185 * low four bits) to a page protection mask..
187 extern pgprot_t protection_map
[16];
189 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
190 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
191 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
192 #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */
193 #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */
194 #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */
195 #define FAULT_FLAG_TRIED 0x40 /* second try */
196 #define FAULT_FLAG_USER 0x80 /* The fault originated in userspace */
199 * vm_fault is filled by the the pagefault handler and passed to the vma's
200 * ->fault function. The vma's ->fault is responsible for returning a bitmask
201 * of VM_FAULT_xxx flags that give details about how the fault was handled.
203 * pgoff should be used in favour of virtual_address, if possible. If pgoff
204 * is used, one may implement ->remap_pages to get nonlinear mapping support.
207 unsigned int flags
; /* FAULT_FLAG_xxx flags */
208 pgoff_t pgoff
; /* Logical page offset based on vma */
209 void __user
*virtual_address
; /* Faulting virtual address */
211 struct page
*page
; /* ->fault handlers should return a
212 * page here, unless VM_FAULT_NOPAGE
213 * is set (which is also implied by
216 /* for ->map_pages() only */
217 pgoff_t max_pgoff
; /* map pages for offset from pgoff till
218 * max_pgoff inclusive */
219 pte_t
*pte
; /* pte entry associated with ->pgoff */
223 * These are the virtual MM functions - opening of an area, closing and
224 * unmapping it (needed to keep files on disk up-to-date etc), pointer
225 * to the functions called when a no-page or a wp-page exception occurs.
227 struct vm_operations_struct
{
228 void (*open
)(struct vm_area_struct
* area
);
229 void (*close
)(struct vm_area_struct
* area
);
230 int (*fault
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
231 void (*map_pages
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
233 /* notification that a previously read-only page is about to become
234 * writable, if an error is returned it will cause a SIGBUS */
235 int (*page_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
237 /* called by access_process_vm when get_user_pages() fails, typically
238 * for use by special VMAs that can switch between memory and hardware
240 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
241 void *buf
, int len
, int write
);
244 * set_policy() op must add a reference to any non-NULL @new mempolicy
245 * to hold the policy upon return. Caller should pass NULL @new to
246 * remove a policy and fall back to surrounding context--i.e. do not
247 * install a MPOL_DEFAULT policy, nor the task or system default
250 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
253 * get_policy() op must add reference [mpol_get()] to any policy at
254 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
255 * in mm/mempolicy.c will do this automatically.
256 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
257 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
258 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
259 * must return NULL--i.e., do not "fallback" to task or system default
262 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
264 int (*migrate
)(struct vm_area_struct
*vma
, const nodemask_t
*from
,
265 const nodemask_t
*to
, unsigned long flags
);
267 /* called by sys_remap_file_pages() to populate non-linear mapping */
268 int (*remap_pages
)(struct vm_area_struct
*vma
, unsigned long addr
,
269 unsigned long size
, pgoff_t pgoff
);
275 #define page_private(page) ((page)->private)
276 #define set_page_private(page, v) ((page)->private = (v))
278 /* It's valid only if the page is free path or free_list */
279 static inline void set_freepage_migratetype(struct page
*page
, int migratetype
)
281 page
->index
= migratetype
;
284 /* It's valid only if the page is free path or free_list */
285 static inline int get_freepage_migratetype(struct page
*page
)
291 * FIXME: take this include out, include page-flags.h in
292 * files which need it (119 of them)
294 #include <linux/page-flags.h>
295 #include <linux/huge_mm.h>
298 * Methods to modify the page usage count.
300 * What counts for a page usage:
301 * - cache mapping (page->mapping)
302 * - private data (page->private)
303 * - page mapped in a task's page tables, each mapping
304 * is counted separately
306 * Also, many kernel routines increase the page count before a critical
307 * routine so they can be sure the page doesn't go away from under them.
311 * Drop a ref, return true if the refcount fell to zero (the page has no users)
313 static inline int put_page_testzero(struct page
*page
)
315 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) == 0, page
);
316 return atomic_dec_and_test(&page
->_count
);
320 * Try to grab a ref unless the page has a refcount of zero, return false if
322 * This can be called when MMU is off so it must not access
323 * any of the virtual mappings.
325 static inline int get_page_unless_zero(struct page
*page
)
327 return atomic_inc_not_zero(&page
->_count
);
331 * Try to drop a ref unless the page has a refcount of one, return false if
333 * This is to make sure that the refcount won't become zero after this drop.
334 * This can be called when MMU is off so it must not access
335 * any of the virtual mappings.
337 static inline int put_page_unless_one(struct page
*page
)
339 return atomic_add_unless(&page
->_count
, -1, 1);
342 extern int page_is_ram(unsigned long pfn
);
344 /* Support for virtually mapped pages */
345 struct page
*vmalloc_to_page(const void *addr
);
346 unsigned long vmalloc_to_pfn(const void *addr
);
349 * Determine if an address is within the vmalloc range
351 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
352 * is no special casing required.
354 static inline int is_vmalloc_addr(const void *x
)
357 unsigned long addr
= (unsigned long)x
;
359 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
365 extern int is_vmalloc_or_module_addr(const void *x
);
367 static inline int is_vmalloc_or_module_addr(const void *x
)
373 extern void kvfree(const void *addr
);
375 static inline void compound_lock(struct page
*page
)
377 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
378 VM_BUG_ON_PAGE(PageSlab(page
), page
);
379 bit_spin_lock(PG_compound_lock
, &page
->flags
);
383 static inline void compound_unlock(struct page
*page
)
385 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
386 VM_BUG_ON_PAGE(PageSlab(page
), page
);
387 bit_spin_unlock(PG_compound_lock
, &page
->flags
);
391 static inline unsigned long compound_lock_irqsave(struct page
*page
)
393 unsigned long uninitialized_var(flags
);
394 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
395 local_irq_save(flags
);
401 static inline void compound_unlock_irqrestore(struct page
*page
,
404 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
405 compound_unlock(page
);
406 local_irq_restore(flags
);
410 static inline struct page
*compound_head_by_tail(struct page
*tail
)
412 struct page
*head
= tail
->first_page
;
415 * page->first_page may be a dangling pointer to an old
416 * compound page, so recheck that it is still a tail
417 * page before returning.
420 if (likely(PageTail(tail
)))
425 static inline struct page
*compound_head(struct page
*page
)
427 if (unlikely(PageTail(page
)))
428 return compound_head_by_tail(page
);
433 * The atomic page->_mapcount, starts from -1: so that transitions
434 * both from it and to it can be tracked, using atomic_inc_and_test
435 * and atomic_add_negative(-1).
437 static inline void page_mapcount_reset(struct page
*page
)
439 atomic_set(&(page
)->_mapcount
, -1);
442 static inline int page_mapcount(struct page
*page
)
444 return atomic_read(&(page
)->_mapcount
) + 1;
447 static inline int page_count(struct page
*page
)
449 return atomic_read(&compound_head(page
)->_count
);
452 #ifdef CONFIG_HUGETLB_PAGE
453 extern int PageHeadHuge(struct page
*page_head
);
454 #else /* CONFIG_HUGETLB_PAGE */
455 static inline int PageHeadHuge(struct page
*page_head
)
459 #endif /* CONFIG_HUGETLB_PAGE */
461 static inline bool __compound_tail_refcounted(struct page
*page
)
463 return !PageSlab(page
) && !PageHeadHuge(page
);
467 * This takes a head page as parameter and tells if the
468 * tail page reference counting can be skipped.
470 * For this to be safe, PageSlab and PageHeadHuge must remain true on
471 * any given page where they return true here, until all tail pins
472 * have been released.
474 static inline bool compound_tail_refcounted(struct page
*page
)
476 VM_BUG_ON_PAGE(!PageHead(page
), page
);
477 return __compound_tail_refcounted(page
);
480 static inline void get_huge_page_tail(struct page
*page
)
483 * __split_huge_page_refcount() cannot run from under us.
485 VM_BUG_ON_PAGE(!PageTail(page
), page
);
486 VM_BUG_ON_PAGE(page_mapcount(page
) < 0, page
);
487 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) != 0, page
);
488 if (compound_tail_refcounted(page
->first_page
))
489 atomic_inc(&page
->_mapcount
);
492 extern bool __get_page_tail(struct page
*page
);
494 static inline void get_page(struct page
*page
)
496 if (unlikely(PageTail(page
)))
497 if (likely(__get_page_tail(page
)))
500 * Getting a normal page or the head of a compound page
501 * requires to already have an elevated page->_count.
503 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) <= 0, page
);
504 atomic_inc(&page
->_count
);
507 static inline struct page
*virt_to_head_page(const void *x
)
509 struct page
*page
= virt_to_page(x
);
510 return compound_head(page
);
514 * Setup the page count before being freed into the page allocator for
515 * the first time (boot or memory hotplug)
517 static inline void init_page_count(struct page
*page
)
519 atomic_set(&page
->_count
, 1);
523 * PageBuddy() indicate that the page is free and in the buddy system
524 * (see mm/page_alloc.c).
526 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
527 * -2 so that an underflow of the page_mapcount() won't be mistaken
528 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
529 * efficiently by most CPU architectures.
531 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
533 static inline int PageBuddy(struct page
*page
)
535 return atomic_read(&page
->_mapcount
) == PAGE_BUDDY_MAPCOUNT_VALUE
;
538 static inline void __SetPageBuddy(struct page
*page
)
540 VM_BUG_ON_PAGE(atomic_read(&page
->_mapcount
) != -1, page
);
541 atomic_set(&page
->_mapcount
, PAGE_BUDDY_MAPCOUNT_VALUE
);
544 static inline void __ClearPageBuddy(struct page
*page
)
546 VM_BUG_ON_PAGE(!PageBuddy(page
), page
);
547 atomic_set(&page
->_mapcount
, -1);
550 void put_page(struct page
*page
);
551 void put_pages_list(struct list_head
*pages
);
553 void split_page(struct page
*page
, unsigned int order
);
554 int split_free_page(struct page
*page
);
557 * Compound pages have a destructor function. Provide a
558 * prototype for that function and accessor functions.
559 * These are _only_ valid on the head of a PG_compound page.
561 typedef void compound_page_dtor(struct page
*);
563 static inline void set_compound_page_dtor(struct page
*page
,
564 compound_page_dtor
*dtor
)
566 page
[1].lru
.next
= (void *)dtor
;
569 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
571 return (compound_page_dtor
*)page
[1].lru
.next
;
574 static inline int compound_order(struct page
*page
)
578 return (unsigned long)page
[1].lru
.prev
;
581 static inline void set_compound_order(struct page
*page
, unsigned long order
)
583 page
[1].lru
.prev
= (void *)order
;
588 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
589 * servicing faults for write access. In the normal case, do always want
590 * pte_mkwrite. But get_user_pages can cause write faults for mappings
591 * that do not have writing enabled, when used by access_process_vm.
593 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
595 if (likely(vma
->vm_flags
& VM_WRITE
))
596 pte
= pte_mkwrite(pte
);
600 void do_set_pte(struct vm_area_struct
*vma
, unsigned long address
,
601 struct page
*page
, pte_t
*pte
, bool write
, bool anon
);
605 * Multiple processes may "see" the same page. E.g. for untouched
606 * mappings of /dev/null, all processes see the same page full of
607 * zeroes, and text pages of executables and shared libraries have
608 * only one copy in memory, at most, normally.
610 * For the non-reserved pages, page_count(page) denotes a reference count.
611 * page_count() == 0 means the page is free. page->lru is then used for
612 * freelist management in the buddy allocator.
613 * page_count() > 0 means the page has been allocated.
615 * Pages are allocated by the slab allocator in order to provide memory
616 * to kmalloc and kmem_cache_alloc. In this case, the management of the
617 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
618 * unless a particular usage is carefully commented. (the responsibility of
619 * freeing the kmalloc memory is the caller's, of course).
621 * A page may be used by anyone else who does a __get_free_page().
622 * In this case, page_count still tracks the references, and should only
623 * be used through the normal accessor functions. The top bits of page->flags
624 * and page->virtual store page management information, but all other fields
625 * are unused and could be used privately, carefully. The management of this
626 * page is the responsibility of the one who allocated it, and those who have
627 * subsequently been given references to it.
629 * The other pages (we may call them "pagecache pages") are completely
630 * managed by the Linux memory manager: I/O, buffers, swapping etc.
631 * The following discussion applies only to them.
633 * A pagecache page contains an opaque `private' member, which belongs to the
634 * page's address_space. Usually, this is the address of a circular list of
635 * the page's disk buffers. PG_private must be set to tell the VM to call
636 * into the filesystem to release these pages.
638 * A page may belong to an inode's memory mapping. In this case, page->mapping
639 * is the pointer to the inode, and page->index is the file offset of the page,
640 * in units of PAGE_CACHE_SIZE.
642 * If pagecache pages are not associated with an inode, they are said to be
643 * anonymous pages. These may become associated with the swapcache, and in that
644 * case PG_swapcache is set, and page->private is an offset into the swapcache.
646 * In either case (swapcache or inode backed), the pagecache itself holds one
647 * reference to the page. Setting PG_private should also increment the
648 * refcount. The each user mapping also has a reference to the page.
650 * The pagecache pages are stored in a per-mapping radix tree, which is
651 * rooted at mapping->page_tree, and indexed by offset.
652 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
653 * lists, we instead now tag pages as dirty/writeback in the radix tree.
655 * All pagecache pages may be subject to I/O:
656 * - inode pages may need to be read from disk,
657 * - inode pages which have been modified and are MAP_SHARED may need
658 * to be written back to the inode on disk,
659 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
660 * modified may need to be swapped out to swap space and (later) to be read
665 * The zone field is never updated after free_area_init_core()
666 * sets it, so none of the operations on it need to be atomic.
669 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
670 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
671 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
672 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
673 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
676 * Define the bit shifts to access each section. For non-existent
677 * sections we define the shift as 0; that plus a 0 mask ensures
678 * the compiler will optimise away reference to them.
680 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
681 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
682 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
683 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
685 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
686 #ifdef NODE_NOT_IN_PAGE_FLAGS
687 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
688 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
689 SECTIONS_PGOFF : ZONES_PGOFF)
691 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
692 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
693 NODES_PGOFF : ZONES_PGOFF)
696 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
698 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
699 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
702 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
703 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
704 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
705 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
706 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
708 static inline enum zone_type
page_zonenum(const struct page
*page
)
710 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
713 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
714 #define SECTION_IN_PAGE_FLAGS
718 * The identification function is mainly used by the buddy allocator for
719 * determining if two pages could be buddies. We are not really identifying
720 * the zone since we could be using the section number id if we do not have
721 * node id available in page flags.
722 * We only guarantee that it will return the same value for two combinable
725 static inline int page_zone_id(struct page
*page
)
727 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
730 static inline int zone_to_nid(struct zone
*zone
)
739 #ifdef NODE_NOT_IN_PAGE_FLAGS
740 extern int page_to_nid(const struct page
*page
);
742 static inline int page_to_nid(const struct page
*page
)
744 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
748 #ifdef CONFIG_NUMA_BALANCING
749 static inline int cpu_pid_to_cpupid(int cpu
, int pid
)
751 return ((cpu
& LAST__CPU_MASK
) << LAST__PID_SHIFT
) | (pid
& LAST__PID_MASK
);
754 static inline int cpupid_to_pid(int cpupid
)
756 return cpupid
& LAST__PID_MASK
;
759 static inline int cpupid_to_cpu(int cpupid
)
761 return (cpupid
>> LAST__PID_SHIFT
) & LAST__CPU_MASK
;
764 static inline int cpupid_to_nid(int cpupid
)
766 return cpu_to_node(cpupid_to_cpu(cpupid
));
769 static inline bool cpupid_pid_unset(int cpupid
)
771 return cpupid_to_pid(cpupid
) == (-1 & LAST__PID_MASK
);
774 static inline bool cpupid_cpu_unset(int cpupid
)
776 return cpupid_to_cpu(cpupid
) == (-1 & LAST__CPU_MASK
);
779 static inline bool __cpupid_match_pid(pid_t task_pid
, int cpupid
)
781 return (task_pid
& LAST__PID_MASK
) == cpupid_to_pid(cpupid
);
784 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
785 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
786 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
788 return xchg(&page
->_last_cpupid
, cpupid
& LAST_CPUPID_MASK
);
791 static inline int page_cpupid_last(struct page
*page
)
793 return page
->_last_cpupid
;
795 static inline void page_cpupid_reset_last(struct page
*page
)
797 page
->_last_cpupid
= -1 & LAST_CPUPID_MASK
;
800 static inline int page_cpupid_last(struct page
*page
)
802 return (page
->flags
>> LAST_CPUPID_PGSHIFT
) & LAST_CPUPID_MASK
;
805 extern int page_cpupid_xchg_last(struct page
*page
, int cpupid
);
807 static inline void page_cpupid_reset_last(struct page
*page
)
809 int cpupid
= (1 << LAST_CPUPID_SHIFT
) - 1;
811 page
->flags
&= ~(LAST_CPUPID_MASK
<< LAST_CPUPID_PGSHIFT
);
812 page
->flags
|= (cpupid
& LAST_CPUPID_MASK
) << LAST_CPUPID_PGSHIFT
;
814 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
815 #else /* !CONFIG_NUMA_BALANCING */
816 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
818 return page_to_nid(page
); /* XXX */
821 static inline int page_cpupid_last(struct page
*page
)
823 return page_to_nid(page
); /* XXX */
826 static inline int cpupid_to_nid(int cpupid
)
831 static inline int cpupid_to_pid(int cpupid
)
836 static inline int cpupid_to_cpu(int cpupid
)
841 static inline int cpu_pid_to_cpupid(int nid
, int pid
)
846 static inline bool cpupid_pid_unset(int cpupid
)
851 static inline void page_cpupid_reset_last(struct page
*page
)
855 static inline bool cpupid_match_pid(struct task_struct
*task
, int cpupid
)
859 #endif /* CONFIG_NUMA_BALANCING */
861 static inline struct zone
*page_zone(const struct page
*page
)
863 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
866 #ifdef SECTION_IN_PAGE_FLAGS
867 static inline void set_page_section(struct page
*page
, unsigned long section
)
869 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
870 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
873 static inline unsigned long page_to_section(const struct page
*page
)
875 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
879 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
881 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
882 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
885 static inline void set_page_node(struct page
*page
, unsigned long node
)
887 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
888 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
891 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
892 unsigned long node
, unsigned long pfn
)
894 set_page_zone(page
, zone
);
895 set_page_node(page
, node
);
896 #ifdef SECTION_IN_PAGE_FLAGS
897 set_page_section(page
, pfn_to_section_nr(pfn
));
902 * Some inline functions in vmstat.h depend on page_zone()
904 #include <linux/vmstat.h>
906 static __always_inline
void *lowmem_page_address(const struct page
*page
)
908 return __va(PFN_PHYS(page_to_pfn(page
)));
911 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
912 #define HASHED_PAGE_VIRTUAL
915 #if defined(WANT_PAGE_VIRTUAL)
916 static inline void *page_address(const struct page
*page
)
918 return page
->virtual;
920 static inline void set_page_address(struct page
*page
, void *address
)
922 page
->virtual = address
;
924 #define page_address_init() do { } while(0)
927 #if defined(HASHED_PAGE_VIRTUAL)
928 void *page_address(const struct page
*page
);
929 void set_page_address(struct page
*page
, void *virtual);
930 void page_address_init(void);
933 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
934 #define page_address(page) lowmem_page_address(page)
935 #define set_page_address(page, address) do { } while(0)
936 #define page_address_init() do { } while(0)
940 * On an anonymous page mapped into a user virtual memory area,
941 * page->mapping points to its anon_vma, not to a struct address_space;
942 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
944 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
945 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
946 * and then page->mapping points, not to an anon_vma, but to a private
947 * structure which KSM associates with that merged page. See ksm.h.
949 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
951 * Please note that, confusingly, "page_mapping" refers to the inode
952 * address_space which maps the page from disk; whereas "page_mapped"
953 * refers to user virtual address space into which the page is mapped.
955 #define PAGE_MAPPING_ANON 1
956 #define PAGE_MAPPING_KSM 2
957 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
959 extern struct address_space
*page_mapping(struct page
*page
);
961 /* Neutral page->mapping pointer to address_space or anon_vma or other */
962 static inline void *page_rmapping(struct page
*page
)
964 return (void *)((unsigned long)page
->mapping
& ~PAGE_MAPPING_FLAGS
);
967 extern struct address_space
*__page_file_mapping(struct page
*);
970 struct address_space
*page_file_mapping(struct page
*page
)
972 if (unlikely(PageSwapCache(page
)))
973 return __page_file_mapping(page
);
975 return page
->mapping
;
978 static inline int PageAnon(struct page
*page
)
980 return ((unsigned long)page
->mapping
& PAGE_MAPPING_ANON
) != 0;
984 * Return the pagecache index of the passed page. Regular pagecache pages
985 * use ->index whereas swapcache pages use ->private
987 static inline pgoff_t
page_index(struct page
*page
)
989 if (unlikely(PageSwapCache(page
)))
990 return page_private(page
);
994 extern pgoff_t
__page_file_index(struct page
*page
);
997 * Return the file index of the page. Regular pagecache pages use ->index
998 * whereas swapcache pages use swp_offset(->private)
1000 static inline pgoff_t
page_file_index(struct page
*page
)
1002 if (unlikely(PageSwapCache(page
)))
1003 return __page_file_index(page
);
1009 * Return true if this page is mapped into pagetables.
1011 static inline int page_mapped(struct page
*page
)
1013 return atomic_read(&(page
)->_mapcount
) >= 0;
1017 * Different kinds of faults, as returned by handle_mm_fault().
1018 * Used to decide whether a process gets delivered SIGBUS or
1019 * just gets major/minor fault counters bumped up.
1022 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1024 #define VM_FAULT_OOM 0x0001
1025 #define VM_FAULT_SIGBUS 0x0002
1026 #define VM_FAULT_MAJOR 0x0004
1027 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1028 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1029 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1031 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1032 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1033 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1034 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1036 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1038 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
1039 VM_FAULT_FALLBACK | VM_FAULT_HWPOISON_LARGE)
1041 /* Encode hstate index for a hwpoisoned large page */
1042 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1043 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1046 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1048 extern void pagefault_out_of_memory(void);
1050 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1053 * Flags passed to show_mem() and show_free_areas() to suppress output in
1056 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1058 extern void show_free_areas(unsigned int flags
);
1059 extern bool skip_free_areas_node(unsigned int flags
, int nid
);
1061 int shmem_zero_setup(struct vm_area_struct
*);
1063 bool shmem_mapping(struct address_space
*mapping
);
1065 static inline bool shmem_mapping(struct address_space
*mapping
)
1071 extern int can_do_mlock(void);
1072 extern int user_shm_lock(size_t, struct user_struct
*);
1073 extern void user_shm_unlock(size_t, struct user_struct
*);
1076 * Parameter block passed down to zap_pte_range in exceptional cases.
1078 struct zap_details
{
1079 struct vm_area_struct
*nonlinear_vma
; /* Check page->index if set */
1080 struct address_space
*check_mapping
; /* Check page->mapping if set */
1081 pgoff_t first_index
; /* Lowest page->index to unmap */
1082 pgoff_t last_index
; /* Highest page->index to unmap */
1085 struct page
*vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
1088 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
1089 unsigned long size
);
1090 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
1091 unsigned long size
, struct zap_details
*);
1092 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
1093 unsigned long start
, unsigned long end
);
1096 * mm_walk - callbacks for walk_page_range
1097 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
1098 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1099 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1100 * this handler is required to be able to handle
1101 * pmd_trans_huge() pmds. They may simply choose to
1102 * split_huge_page() instead of handling it explicitly.
1103 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1104 * @pte_hole: if set, called for each hole at all levels
1105 * @hugetlb_entry: if set, called for each hugetlb entry
1106 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
1109 * (see walk_page_range for more details)
1112 int (*pgd_entry
)(pgd_t
*pgd
, unsigned long addr
,
1113 unsigned long next
, struct mm_walk
*walk
);
1114 int (*pud_entry
)(pud_t
*pud
, unsigned long addr
,
1115 unsigned long next
, struct mm_walk
*walk
);
1116 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
1117 unsigned long next
, struct mm_walk
*walk
);
1118 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
1119 unsigned long next
, struct mm_walk
*walk
);
1120 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
1121 struct mm_walk
*walk
);
1122 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
1123 unsigned long addr
, unsigned long next
,
1124 struct mm_walk
*walk
);
1125 struct mm_struct
*mm
;
1129 int walk_page_range(unsigned long addr
, unsigned long end
,
1130 struct mm_walk
*walk
);
1131 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1132 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1133 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1134 struct vm_area_struct
*vma
);
1135 void unmap_mapping_range(struct address_space
*mapping
,
1136 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1137 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1138 unsigned long *pfn
);
1139 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1140 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1141 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1142 void *buf
, int len
, int write
);
1144 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1145 loff_t
const holebegin
, loff_t
const holelen
)
1147 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1150 extern void truncate_pagecache(struct inode
*inode
, loff_t
new);
1151 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1152 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1153 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1154 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1155 int invalidate_inode_page(struct page
*page
);
1158 extern int handle_mm_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1159 unsigned long address
, unsigned int flags
);
1160 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1161 unsigned long address
, unsigned int fault_flags
);
1163 static inline int handle_mm_fault(struct mm_struct
*mm
,
1164 struct vm_area_struct
*vma
, unsigned long address
,
1167 /* should never happen if there's no MMU */
1169 return VM_FAULT_SIGBUS
;
1171 static inline int fixup_user_fault(struct task_struct
*tsk
,
1172 struct mm_struct
*mm
, unsigned long address
,
1173 unsigned int fault_flags
)
1175 /* should never happen if there's no MMU */
1181 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
1182 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1183 void *buf
, int len
, int write
);
1185 long __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1186 unsigned long start
, unsigned long nr_pages
,
1187 unsigned int foll_flags
, struct page
**pages
,
1188 struct vm_area_struct
**vmas
, int *nonblocking
);
1189 long get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1190 unsigned long start
, unsigned long nr_pages
,
1191 int write
, int force
, struct page
**pages
,
1192 struct vm_area_struct
**vmas
);
1193 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1194 struct page
**pages
);
1196 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1197 struct page
**pages
);
1198 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1199 struct page
*get_dump_page(unsigned long addr
);
1201 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1202 extern void do_invalidatepage(struct page
*page
, unsigned int offset
,
1203 unsigned int length
);
1205 int __set_page_dirty_nobuffers(struct page
*page
);
1206 int __set_page_dirty_no_writeback(struct page
*page
);
1207 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1209 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1210 void account_page_writeback(struct page
*page
);
1211 int set_page_dirty(struct page
*page
);
1212 int set_page_dirty_lock(struct page
*page
);
1213 int clear_page_dirty_for_io(struct page
*page
);
1214 int get_cmdline(struct task_struct
*task
, char *buffer
, int buflen
);
1216 /* Is the vma a continuation of the stack vma above it? */
1217 static inline int vma_growsdown(struct vm_area_struct
*vma
, unsigned long addr
)
1219 return vma
&& (vma
->vm_end
== addr
) && (vma
->vm_flags
& VM_GROWSDOWN
);
1222 static inline int stack_guard_page_start(struct vm_area_struct
*vma
,
1225 return (vma
->vm_flags
& VM_GROWSDOWN
) &&
1226 (vma
->vm_start
== addr
) &&
1227 !vma_growsdown(vma
->vm_prev
, addr
);
1230 /* Is the vma a continuation of the stack vma below it? */
1231 static inline int vma_growsup(struct vm_area_struct
*vma
, unsigned long addr
)
1233 return vma
&& (vma
->vm_start
== addr
) && (vma
->vm_flags
& VM_GROWSUP
);
1236 static inline int stack_guard_page_end(struct vm_area_struct
*vma
,
1239 return (vma
->vm_flags
& VM_GROWSUP
) &&
1240 (vma
->vm_end
== addr
) &&
1241 !vma_growsup(vma
->vm_next
, addr
);
1245 vm_is_stack(struct task_struct
*task
, struct vm_area_struct
*vma
, int in_group
);
1247 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1248 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1249 unsigned long new_addr
, unsigned long len
,
1250 bool need_rmap_locks
);
1251 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1252 unsigned long end
, pgprot_t newprot
,
1253 int dirty_accountable
, int prot_numa
);
1254 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1255 struct vm_area_struct
**pprev
, unsigned long start
,
1256 unsigned long end
, unsigned long newflags
);
1259 * doesn't attempt to fault and will return short.
1261 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1262 struct page
**pages
);
1264 * per-process(per-mm_struct) statistics.
1266 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1268 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1270 #ifdef SPLIT_RSS_COUNTING
1272 * counter is updated in asynchronous manner and may go to minus.
1273 * But it's never be expected number for users.
1278 return (unsigned long)val
;
1281 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1283 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1286 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1288 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1291 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1293 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1296 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1298 return get_mm_counter(mm
, MM_FILEPAGES
) +
1299 get_mm_counter(mm
, MM_ANONPAGES
);
1302 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1304 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1307 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1309 return max(mm
->hiwater_vm
, mm
->total_vm
);
1312 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1314 unsigned long _rss
= get_mm_rss(mm
);
1316 if ((mm
)->hiwater_rss
< _rss
)
1317 (mm
)->hiwater_rss
= _rss
;
1320 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1322 if (mm
->hiwater_vm
< mm
->total_vm
)
1323 mm
->hiwater_vm
= mm
->total_vm
;
1326 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1327 struct mm_struct
*mm
)
1329 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1331 if (*maxrss
< hiwater_rss
)
1332 *maxrss
= hiwater_rss
;
1335 #if defined(SPLIT_RSS_COUNTING)
1336 void sync_mm_rss(struct mm_struct
*mm
);
1338 static inline void sync_mm_rss(struct mm_struct
*mm
)
1343 int vma_wants_writenotify(struct vm_area_struct
*vma
);
1345 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1347 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1351 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1355 #ifdef __PAGETABLE_PUD_FOLDED
1356 static inline int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1357 unsigned long address
)
1362 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1365 #ifdef __PAGETABLE_PMD_FOLDED
1366 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1367 unsigned long address
)
1372 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1375 int __pte_alloc(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1376 pmd_t
*pmd
, unsigned long address
);
1377 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1380 * The following ifdef needed to get the 4level-fixup.h header to work.
1381 * Remove it when 4level-fixup.h has been removed.
1383 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1384 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
1386 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
1387 NULL
: pud_offset(pgd
, address
);
1390 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1392 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1393 NULL
: pmd_offset(pud
, address
);
1395 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1397 #if USE_SPLIT_PTE_PTLOCKS
1398 #if ALLOC_SPLIT_PTLOCKS
1399 void __init
ptlock_cache_init(void);
1400 extern bool ptlock_alloc(struct page
*page
);
1401 extern void ptlock_free(struct page
*page
);
1403 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1407 #else /* ALLOC_SPLIT_PTLOCKS */
1408 static inline void ptlock_cache_init(void)
1412 static inline bool ptlock_alloc(struct page
*page
)
1417 static inline void ptlock_free(struct page
*page
)
1421 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1425 #endif /* ALLOC_SPLIT_PTLOCKS */
1427 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1429 return ptlock_ptr(pmd_page(*pmd
));
1432 static inline bool ptlock_init(struct page
*page
)
1435 * prep_new_page() initialize page->private (and therefore page->ptl)
1436 * with 0. Make sure nobody took it in use in between.
1438 * It can happen if arch try to use slab for page table allocation:
1439 * slab code uses page->slab_cache and page->first_page (for tail
1440 * pages), which share storage with page->ptl.
1442 VM_BUG_ON_PAGE(*(unsigned long *)&page
->ptl
, page
);
1443 if (!ptlock_alloc(page
))
1445 spin_lock_init(ptlock_ptr(page
));
1449 /* Reset page->mapping so free_pages_check won't complain. */
1450 static inline void pte_lock_deinit(struct page
*page
)
1452 page
->mapping
= NULL
;
1456 #else /* !USE_SPLIT_PTE_PTLOCKS */
1458 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1460 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1462 return &mm
->page_table_lock
;
1464 static inline void ptlock_cache_init(void) {}
1465 static inline bool ptlock_init(struct page
*page
) { return true; }
1466 static inline void pte_lock_deinit(struct page
*page
) {}
1467 #endif /* USE_SPLIT_PTE_PTLOCKS */
1469 static inline void pgtable_init(void)
1471 ptlock_cache_init();
1472 pgtable_cache_init();
1475 static inline bool pgtable_page_ctor(struct page
*page
)
1477 inc_zone_page_state(page
, NR_PAGETABLE
);
1478 return ptlock_init(page
);
1481 static inline void pgtable_page_dtor(struct page
*page
)
1483 pte_lock_deinit(page
);
1484 dec_zone_page_state(page
, NR_PAGETABLE
);
1487 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1489 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1490 pte_t *__pte = pte_offset_map(pmd, address); \
1496 #define pte_unmap_unlock(pte, ptl) do { \
1501 #define pte_alloc_map(mm, vma, pmd, address) \
1502 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1504 NULL: pte_offset_map(pmd, address))
1506 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1507 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1509 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1511 #define pte_alloc_kernel(pmd, address) \
1512 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1513 NULL: pte_offset_kernel(pmd, address))
1515 #if USE_SPLIT_PMD_PTLOCKS
1517 static struct page
*pmd_to_page(pmd_t
*pmd
)
1519 unsigned long mask
= ~(PTRS_PER_PMD
* sizeof(pmd_t
) - 1);
1520 return virt_to_page((void *)((unsigned long) pmd
& mask
));
1523 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1525 return ptlock_ptr(pmd_to_page(pmd
));
1528 static inline bool pgtable_pmd_page_ctor(struct page
*page
)
1530 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1531 page
->pmd_huge_pte
= NULL
;
1533 return ptlock_init(page
);
1536 static inline void pgtable_pmd_page_dtor(struct page
*page
)
1538 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1539 VM_BUG_ON_PAGE(page
->pmd_huge_pte
, page
);
1544 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1548 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1550 return &mm
->page_table_lock
;
1553 static inline bool pgtable_pmd_page_ctor(struct page
*page
) { return true; }
1554 static inline void pgtable_pmd_page_dtor(struct page
*page
) {}
1556 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1560 static inline spinlock_t
*pmd_lock(struct mm_struct
*mm
, pmd_t
*pmd
)
1562 spinlock_t
*ptl
= pmd_lockptr(mm
, pmd
);
1567 extern void free_area_init(unsigned long * zones_size
);
1568 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1569 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1570 extern void free_initmem(void);
1573 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1574 * into the buddy system. The freed pages will be poisoned with pattern
1575 * "poison" if it's within range [0, UCHAR_MAX].
1576 * Return pages freed into the buddy system.
1578 extern unsigned long free_reserved_area(void *start
, void *end
,
1579 int poison
, char *s
);
1581 #ifdef CONFIG_HIGHMEM
1583 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1584 * and totalram_pages.
1586 extern void free_highmem_page(struct page
*page
);
1589 extern void adjust_managed_page_count(struct page
*page
, long count
);
1590 extern void mem_init_print_info(const char *str
);
1592 /* Free the reserved page into the buddy system, so it gets managed. */
1593 static inline void __free_reserved_page(struct page
*page
)
1595 ClearPageReserved(page
);
1596 init_page_count(page
);
1600 static inline void free_reserved_page(struct page
*page
)
1602 __free_reserved_page(page
);
1603 adjust_managed_page_count(page
, 1);
1606 static inline void mark_page_reserved(struct page
*page
)
1608 SetPageReserved(page
);
1609 adjust_managed_page_count(page
, -1);
1613 * Default method to free all the __init memory into the buddy system.
1614 * The freed pages will be poisoned with pattern "poison" if it's within
1615 * range [0, UCHAR_MAX].
1616 * Return pages freed into the buddy system.
1618 static inline unsigned long free_initmem_default(int poison
)
1620 extern char __init_begin
[], __init_end
[];
1622 return free_reserved_area(&__init_begin
, &__init_end
,
1623 poison
, "unused kernel");
1626 static inline unsigned long get_num_physpages(void)
1629 unsigned long phys_pages
= 0;
1631 for_each_online_node(nid
)
1632 phys_pages
+= node_present_pages(nid
);
1637 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1639 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1640 * zones, allocate the backing mem_map and account for memory holes in a more
1641 * architecture independent manner. This is a substitute for creating the
1642 * zone_sizes[] and zholes_size[] arrays and passing them to
1643 * free_area_init_node()
1645 * An architecture is expected to register range of page frames backed by
1646 * physical memory with memblock_add[_node]() before calling
1647 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1648 * usage, an architecture is expected to do something like
1650 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1652 * for_each_valid_physical_page_range()
1653 * memblock_add_node(base, size, nid)
1654 * free_area_init_nodes(max_zone_pfns);
1656 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1657 * registered physical page range. Similarly
1658 * sparse_memory_present_with_active_regions() calls memory_present() for
1659 * each range when SPARSEMEM is enabled.
1661 * See mm/page_alloc.c for more information on each function exposed by
1662 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1664 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1665 unsigned long node_map_pfn_alignment(void);
1666 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1667 unsigned long end_pfn
);
1668 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1669 unsigned long end_pfn
);
1670 extern void get_pfn_range_for_nid(unsigned int nid
,
1671 unsigned long *start_pfn
, unsigned long *end_pfn
);
1672 extern unsigned long find_min_pfn_with_active_regions(void);
1673 extern void free_bootmem_with_active_regions(int nid
,
1674 unsigned long max_low_pfn
);
1675 extern void sparse_memory_present_with_active_regions(int nid
);
1677 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1679 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1680 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1681 static inline int __early_pfn_to_nid(unsigned long pfn
)
1686 /* please see mm/page_alloc.c */
1687 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1688 /* there is a per-arch backend function. */
1689 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
);
1692 extern void set_dma_reserve(unsigned long new_dma_reserve
);
1693 extern void memmap_init_zone(unsigned long, int, unsigned long,
1694 unsigned long, enum memmap_context
);
1695 extern void setup_per_zone_wmarks(void);
1696 extern int __meminit
init_per_zone_wmark_min(void);
1697 extern void mem_init(void);
1698 extern void __init
mmap_init(void);
1699 extern void show_mem(unsigned int flags
);
1700 extern void si_meminfo(struct sysinfo
* val
);
1701 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
1703 extern __printf(3, 4)
1704 void warn_alloc_failed(gfp_t gfp_mask
, int order
, const char *fmt
, ...);
1706 extern void setup_per_cpu_pageset(void);
1708 extern void zone_pcp_update(struct zone
*zone
);
1709 extern void zone_pcp_reset(struct zone
*zone
);
1712 extern int min_free_kbytes
;
1715 extern atomic_long_t mmap_pages_allocated
;
1716 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
1718 /* interval_tree.c */
1719 void vma_interval_tree_insert(struct vm_area_struct
*node
,
1720 struct rb_root
*root
);
1721 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
1722 struct vm_area_struct
*prev
,
1723 struct rb_root
*root
);
1724 void vma_interval_tree_remove(struct vm_area_struct
*node
,
1725 struct rb_root
*root
);
1726 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root
*root
,
1727 unsigned long start
, unsigned long last
);
1728 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
1729 unsigned long start
, unsigned long last
);
1731 #define vma_interval_tree_foreach(vma, root, start, last) \
1732 for (vma = vma_interval_tree_iter_first(root, start, last); \
1733 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1735 static inline void vma_nonlinear_insert(struct vm_area_struct
*vma
,
1736 struct list_head
*list
)
1738 list_add_tail(&vma
->shared
.nonlinear
, list
);
1741 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
1742 struct rb_root
*root
);
1743 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
1744 struct rb_root
*root
);
1745 struct anon_vma_chain
*anon_vma_interval_tree_iter_first(
1746 struct rb_root
*root
, unsigned long start
, unsigned long last
);
1747 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
1748 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
1749 #ifdef CONFIG_DEBUG_VM_RB
1750 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
1753 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1754 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1755 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1758 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
1759 extern int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
1760 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
1761 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
1762 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
1763 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
1764 struct mempolicy
*);
1765 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
1766 extern int split_vma(struct mm_struct
*,
1767 struct vm_area_struct
*, unsigned long addr
, int new_below
);
1768 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
1769 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
1770 struct rb_node
**, struct rb_node
*);
1771 extern void unlink_file_vma(struct vm_area_struct
*);
1772 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
1773 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
1774 bool *need_rmap_locks
);
1775 extern void exit_mmap(struct mm_struct
*);
1777 extern int mm_take_all_locks(struct mm_struct
*mm
);
1778 extern void mm_drop_all_locks(struct mm_struct
*mm
);
1780 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
1781 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
1783 extern int may_expand_vm(struct mm_struct
*mm
, unsigned long npages
);
1784 extern struct vm_area_struct
*_install_special_mapping(struct mm_struct
*mm
,
1785 unsigned long addr
, unsigned long len
,
1786 unsigned long flags
, struct page
**pages
);
1787 extern int install_special_mapping(struct mm_struct
*mm
,
1788 unsigned long addr
, unsigned long len
,
1789 unsigned long flags
, struct page
**pages
);
1791 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1793 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
1794 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
);
1795 extern unsigned long do_mmap_pgoff(struct file
*file
, unsigned long addr
,
1796 unsigned long len
, unsigned long prot
, unsigned long flags
,
1797 unsigned long pgoff
, unsigned long *populate
);
1798 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
1801 extern int __mm_populate(unsigned long addr
, unsigned long len
,
1803 static inline void mm_populate(unsigned long addr
, unsigned long len
)
1806 (void) __mm_populate(addr
, len
, 1);
1809 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
1812 /* These take the mm semaphore themselves */
1813 extern unsigned long vm_brk(unsigned long, unsigned long);
1814 extern int vm_munmap(unsigned long, size_t);
1815 extern unsigned long vm_mmap(struct file
*, unsigned long,
1816 unsigned long, unsigned long,
1817 unsigned long, unsigned long);
1819 struct vm_unmapped_area_info
{
1820 #define VM_UNMAPPED_AREA_TOPDOWN 1
1821 unsigned long flags
;
1822 unsigned long length
;
1823 unsigned long low_limit
;
1824 unsigned long high_limit
;
1825 unsigned long align_mask
;
1826 unsigned long align_offset
;
1829 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
1830 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
1833 * Search for an unmapped address range.
1835 * We are looking for a range that:
1836 * - does not intersect with any VMA;
1837 * - is contained within the [low_limit, high_limit) interval;
1838 * - is at least the desired size.
1839 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1841 static inline unsigned long
1842 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
1844 if (!(info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
))
1845 return unmapped_area(info
);
1847 return unmapped_area_topdown(info
);
1851 extern void truncate_inode_pages(struct address_space
*, loff_t
);
1852 extern void truncate_inode_pages_range(struct address_space
*,
1853 loff_t lstart
, loff_t lend
);
1854 extern void truncate_inode_pages_final(struct address_space
*);
1856 /* generic vm_area_ops exported for stackable file systems */
1857 extern int filemap_fault(struct vm_area_struct
*, struct vm_fault
*);
1858 extern void filemap_map_pages(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1859 extern int filemap_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1861 /* mm/page-writeback.c */
1862 int write_one_page(struct page
*page
, int wait
);
1863 void task_dirty_inc(struct task_struct
*tsk
);
1866 #define VM_MAX_READAHEAD 128 /* kbytes */
1867 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1869 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
1870 pgoff_t offset
, unsigned long nr_to_read
);
1872 void page_cache_sync_readahead(struct address_space
*mapping
,
1873 struct file_ra_state
*ra
,
1876 unsigned long size
);
1878 void page_cache_async_readahead(struct address_space
*mapping
,
1879 struct file_ra_state
*ra
,
1883 unsigned long size
);
1885 unsigned long max_sane_readahead(unsigned long nr
);
1887 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1888 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
1890 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1891 extern int expand_downwards(struct vm_area_struct
*vma
,
1892 unsigned long address
);
1894 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
1896 #define expand_upwards(vma, address) do { } while (0)
1899 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1900 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
1901 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
1902 struct vm_area_struct
**pprev
);
1904 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1905 NULL if none. Assume start_addr < end_addr. */
1906 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
1908 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
1910 if (vma
&& end_addr
<= vma
->vm_start
)
1915 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
1917 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
1920 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1921 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
1922 unsigned long vm_start
, unsigned long vm_end
)
1924 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
1926 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
1933 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
1935 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
1941 #ifdef CONFIG_NUMA_BALANCING
1942 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
1943 unsigned long start
, unsigned long end
);
1946 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
1947 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
1948 unsigned long pfn
, unsigned long size
, pgprot_t
);
1949 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
1950 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
1952 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
1954 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
1957 struct page
*follow_page_mask(struct vm_area_struct
*vma
,
1958 unsigned long address
, unsigned int foll_flags
,
1959 unsigned int *page_mask
);
1961 static inline struct page
*follow_page(struct vm_area_struct
*vma
,
1962 unsigned long address
, unsigned int foll_flags
)
1964 unsigned int unused_page_mask
;
1965 return follow_page_mask(vma
, address
, foll_flags
, &unused_page_mask
);
1968 #define FOLL_WRITE 0x01 /* check pte is writable */
1969 #define FOLL_TOUCH 0x02 /* mark page accessed */
1970 #define FOLL_GET 0x04 /* do get_page on page */
1971 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1972 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1973 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
1974 * and return without waiting upon it */
1975 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
1976 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
1977 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
1978 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
1979 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
1981 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
1983 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
1984 unsigned long size
, pte_fn_t fn
, void *data
);
1986 #ifdef CONFIG_PROC_FS
1987 void vm_stat_account(struct mm_struct
*, unsigned long, struct file
*, long);
1989 static inline void vm_stat_account(struct mm_struct
*mm
,
1990 unsigned long flags
, struct file
*file
, long pages
)
1992 mm
->total_vm
+= pages
;
1994 #endif /* CONFIG_PROC_FS */
1996 #ifdef CONFIG_DEBUG_PAGEALLOC
1997 extern void kernel_map_pages(struct page
*page
, int numpages
, int enable
);
1998 #ifdef CONFIG_HIBERNATION
1999 extern bool kernel_page_present(struct page
*page
);
2000 #endif /* CONFIG_HIBERNATION */
2003 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
2004 #ifdef CONFIG_HIBERNATION
2005 static inline bool kernel_page_present(struct page
*page
) { return true; }
2006 #endif /* CONFIG_HIBERNATION */
2009 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
2010 #ifdef __HAVE_ARCH_GATE_AREA
2011 int in_gate_area_no_mm(unsigned long addr
);
2012 int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
2014 int in_gate_area_no_mm(unsigned long addr
);
2015 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
2016 #endif /* __HAVE_ARCH_GATE_AREA */
2018 #ifdef CONFIG_SYSCTL
2019 extern int sysctl_drop_caches
;
2020 int drop_caches_sysctl_handler(struct ctl_table
*, int,
2021 void __user
*, size_t *, loff_t
*);
2024 unsigned long shrink_slab(struct shrink_control
*shrink
,
2025 unsigned long nr_pages_scanned
,
2026 unsigned long lru_pages
);
2029 #define randomize_va_space 0
2031 extern int randomize_va_space
;
2034 const char * arch_vma_name(struct vm_area_struct
*vma
);
2035 void print_vma_addr(char *prefix
, unsigned long rip
);
2037 void sparse_mem_maps_populate_node(struct page
**map_map
,
2038 unsigned long pnum_begin
,
2039 unsigned long pnum_end
,
2040 unsigned long map_count
,
2043 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
2044 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
2045 pud_t
*vmemmap_pud_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
2046 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
2047 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
2048 void *vmemmap_alloc_block(unsigned long size
, int node
);
2049 void *vmemmap_alloc_block_buf(unsigned long size
, int node
);
2050 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
2051 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
2053 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
);
2054 void vmemmap_populate_print_last(void);
2055 #ifdef CONFIG_MEMORY_HOTPLUG
2056 void vmemmap_free(unsigned long start
, unsigned long end
);
2058 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
2059 unsigned long size
);
2062 MF_COUNT_INCREASED
= 1 << 0,
2063 MF_ACTION_REQUIRED
= 1 << 1,
2064 MF_MUST_KILL
= 1 << 2,
2065 MF_SOFT_OFFLINE
= 1 << 3,
2067 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
2068 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
2069 extern int unpoison_memory(unsigned long pfn
);
2070 extern int sysctl_memory_failure_early_kill
;
2071 extern int sysctl_memory_failure_recovery
;
2072 extern void shake_page(struct page
*p
, int access
);
2073 extern atomic_long_t num_poisoned_pages
;
2074 extern int soft_offline_page(struct page
*page
, int flags
);
2076 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2077 extern void clear_huge_page(struct page
*page
,
2079 unsigned int pages_per_huge_page
);
2080 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
2081 unsigned long addr
, struct vm_area_struct
*vma
,
2082 unsigned int pages_per_huge_page
);
2083 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2085 #ifdef CONFIG_DEBUG_PAGEALLOC
2086 extern unsigned int _debug_guardpage_minorder
;
2088 static inline unsigned int debug_guardpage_minorder(void)
2090 return _debug_guardpage_minorder
;
2093 static inline bool page_is_guard(struct page
*page
)
2095 return test_bit(PAGE_DEBUG_FLAG_GUARD
, &page
->debug_flags
);
2098 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2099 static inline bool page_is_guard(struct page
*page
) { return false; }
2100 #endif /* CONFIG_DEBUG_PAGEALLOC */
2102 #if MAX_NUMNODES > 1
2103 void __init
setup_nr_node_ids(void);
2105 static inline void setup_nr_node_ids(void) {}
2108 #endif /* __KERNEL__ */
2109 #endif /* _LINUX_MM_H */