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
);
243 /* Called by the /proc/PID/maps code to ask the vma whether it
244 * has a special name. Returning non-NULL will also cause this
245 * vma to be dumped unconditionally. */
246 const char *(*name
)(struct vm_area_struct
*vma
);
250 * set_policy() op must add a reference to any non-NULL @new mempolicy
251 * to hold the policy upon return. Caller should pass NULL @new to
252 * remove a policy and fall back to surrounding context--i.e. do not
253 * install a MPOL_DEFAULT policy, nor the task or system default
256 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
259 * get_policy() op must add reference [mpol_get()] to any policy at
260 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
261 * in mm/mempolicy.c will do this automatically.
262 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
263 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
264 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
265 * must return NULL--i.e., do not "fallback" to task or system default
268 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
270 int (*migrate
)(struct vm_area_struct
*vma
, const nodemask_t
*from
,
271 const nodemask_t
*to
, unsigned long flags
);
273 /* called by sys_remap_file_pages() to populate non-linear mapping */
274 int (*remap_pages
)(struct vm_area_struct
*vma
, unsigned long addr
,
275 unsigned long size
, pgoff_t pgoff
);
281 #define page_private(page) ((page)->private)
282 #define set_page_private(page, v) ((page)->private = (v))
284 /* It's valid only if the page is free path or free_list */
285 static inline void set_freepage_migratetype(struct page
*page
, int migratetype
)
287 page
->index
= migratetype
;
290 /* It's valid only if the page is free path or free_list */
291 static inline int get_freepage_migratetype(struct page
*page
)
297 * FIXME: take this include out, include page-flags.h in
298 * files which need it (119 of them)
300 #include <linux/page-flags.h>
301 #include <linux/huge_mm.h>
304 * Methods to modify the page usage count.
306 * What counts for a page usage:
307 * - cache mapping (page->mapping)
308 * - private data (page->private)
309 * - page mapped in a task's page tables, each mapping
310 * is counted separately
312 * Also, many kernel routines increase the page count before a critical
313 * routine so they can be sure the page doesn't go away from under them.
317 * Drop a ref, return true if the refcount fell to zero (the page has no users)
319 static inline int put_page_testzero(struct page
*page
)
321 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) == 0, page
);
322 return atomic_dec_and_test(&page
->_count
);
326 * Try to grab a ref unless the page has a refcount of zero, return false if
328 * This can be called when MMU is off so it must not access
329 * any of the virtual mappings.
331 static inline int get_page_unless_zero(struct page
*page
)
333 return atomic_inc_not_zero(&page
->_count
);
337 * Try to drop a ref unless the page has a refcount of one, return false if
339 * This is to make sure that the refcount won't become zero after this drop.
340 * This can be called when MMU is off so it must not access
341 * any of the virtual mappings.
343 static inline int put_page_unless_one(struct page
*page
)
345 return atomic_add_unless(&page
->_count
, -1, 1);
348 extern int page_is_ram(unsigned long pfn
);
350 /* Support for virtually mapped pages */
351 struct page
*vmalloc_to_page(const void *addr
);
352 unsigned long vmalloc_to_pfn(const void *addr
);
355 * Determine if an address is within the vmalloc range
357 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
358 * is no special casing required.
360 static inline int is_vmalloc_addr(const void *x
)
363 unsigned long addr
= (unsigned long)x
;
365 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
371 extern int is_vmalloc_or_module_addr(const void *x
);
373 static inline int is_vmalloc_or_module_addr(const void *x
)
379 extern void kvfree(const void *addr
);
381 static inline void compound_lock(struct page
*page
)
383 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
384 VM_BUG_ON_PAGE(PageSlab(page
), page
);
385 bit_spin_lock(PG_compound_lock
, &page
->flags
);
389 static inline void compound_unlock(struct page
*page
)
391 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
392 VM_BUG_ON_PAGE(PageSlab(page
), page
);
393 bit_spin_unlock(PG_compound_lock
, &page
->flags
);
397 static inline unsigned long compound_lock_irqsave(struct page
*page
)
399 unsigned long uninitialized_var(flags
);
400 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
401 local_irq_save(flags
);
407 static inline void compound_unlock_irqrestore(struct page
*page
,
410 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
411 compound_unlock(page
);
412 local_irq_restore(flags
);
416 static inline struct page
*compound_head_by_tail(struct page
*tail
)
418 struct page
*head
= tail
->first_page
;
421 * page->first_page may be a dangling pointer to an old
422 * compound page, so recheck that it is still a tail
423 * page before returning.
426 if (likely(PageTail(tail
)))
431 static inline struct page
*compound_head(struct page
*page
)
433 if (unlikely(PageTail(page
)))
434 return compound_head_by_tail(page
);
439 * The atomic page->_mapcount, starts from -1: so that transitions
440 * both from it and to it can be tracked, using atomic_inc_and_test
441 * and atomic_add_negative(-1).
443 static inline void page_mapcount_reset(struct page
*page
)
445 atomic_set(&(page
)->_mapcount
, -1);
448 static inline int page_mapcount(struct page
*page
)
450 return atomic_read(&(page
)->_mapcount
) + 1;
453 static inline int page_count(struct page
*page
)
455 return atomic_read(&compound_head(page
)->_count
);
458 #ifdef CONFIG_HUGETLB_PAGE
459 extern int PageHeadHuge(struct page
*page_head
);
460 #else /* CONFIG_HUGETLB_PAGE */
461 static inline int PageHeadHuge(struct page
*page_head
)
465 #endif /* CONFIG_HUGETLB_PAGE */
467 static inline bool __compound_tail_refcounted(struct page
*page
)
469 return !PageSlab(page
) && !PageHeadHuge(page
);
473 * This takes a head page as parameter and tells if the
474 * tail page reference counting can be skipped.
476 * For this to be safe, PageSlab and PageHeadHuge must remain true on
477 * any given page where they return true here, until all tail pins
478 * have been released.
480 static inline bool compound_tail_refcounted(struct page
*page
)
482 VM_BUG_ON_PAGE(!PageHead(page
), page
);
483 return __compound_tail_refcounted(page
);
486 static inline void get_huge_page_tail(struct page
*page
)
489 * __split_huge_page_refcount() cannot run from under us.
491 VM_BUG_ON_PAGE(!PageTail(page
), page
);
492 VM_BUG_ON_PAGE(page_mapcount(page
) < 0, page
);
493 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) != 0, page
);
494 if (compound_tail_refcounted(page
->first_page
))
495 atomic_inc(&page
->_mapcount
);
498 extern bool __get_page_tail(struct page
*page
);
500 static inline void get_page(struct page
*page
)
502 if (unlikely(PageTail(page
)))
503 if (likely(__get_page_tail(page
)))
506 * Getting a normal page or the head of a compound page
507 * requires to already have an elevated page->_count.
509 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) <= 0, page
);
510 atomic_inc(&page
->_count
);
513 static inline struct page
*virt_to_head_page(const void *x
)
515 struct page
*page
= virt_to_page(x
);
516 return compound_head(page
);
520 * Setup the page count before being freed into the page allocator for
521 * the first time (boot or memory hotplug)
523 static inline void init_page_count(struct page
*page
)
525 atomic_set(&page
->_count
, 1);
529 * PageBuddy() indicate that the page is free and in the buddy system
530 * (see mm/page_alloc.c).
532 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
533 * -2 so that an underflow of the page_mapcount() won't be mistaken
534 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
535 * efficiently by most CPU architectures.
537 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
539 static inline int PageBuddy(struct page
*page
)
541 return atomic_read(&page
->_mapcount
) == PAGE_BUDDY_MAPCOUNT_VALUE
;
544 static inline void __SetPageBuddy(struct page
*page
)
546 VM_BUG_ON_PAGE(atomic_read(&page
->_mapcount
) != -1, page
);
547 atomic_set(&page
->_mapcount
, PAGE_BUDDY_MAPCOUNT_VALUE
);
550 static inline void __ClearPageBuddy(struct page
*page
)
552 VM_BUG_ON_PAGE(!PageBuddy(page
), page
);
553 atomic_set(&page
->_mapcount
, -1);
556 void put_page(struct page
*page
);
557 void put_pages_list(struct list_head
*pages
);
559 void split_page(struct page
*page
, unsigned int order
);
560 int split_free_page(struct page
*page
);
563 * Compound pages have a destructor function. Provide a
564 * prototype for that function and accessor functions.
565 * These are _only_ valid on the head of a PG_compound page.
567 typedef void compound_page_dtor(struct page
*);
569 static inline void set_compound_page_dtor(struct page
*page
,
570 compound_page_dtor
*dtor
)
572 page
[1].lru
.next
= (void *)dtor
;
575 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
577 return (compound_page_dtor
*)page
[1].lru
.next
;
580 static inline int compound_order(struct page
*page
)
584 return (unsigned long)page
[1].lru
.prev
;
587 static inline void set_compound_order(struct page
*page
, unsigned long order
)
589 page
[1].lru
.prev
= (void *)order
;
594 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
595 * servicing faults for write access. In the normal case, do always want
596 * pte_mkwrite. But get_user_pages can cause write faults for mappings
597 * that do not have writing enabled, when used by access_process_vm.
599 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
601 if (likely(vma
->vm_flags
& VM_WRITE
))
602 pte
= pte_mkwrite(pte
);
606 void do_set_pte(struct vm_area_struct
*vma
, unsigned long address
,
607 struct page
*page
, pte_t
*pte
, bool write
, bool anon
);
611 * Multiple processes may "see" the same page. E.g. for untouched
612 * mappings of /dev/null, all processes see the same page full of
613 * zeroes, and text pages of executables and shared libraries have
614 * only one copy in memory, at most, normally.
616 * For the non-reserved pages, page_count(page) denotes a reference count.
617 * page_count() == 0 means the page is free. page->lru is then used for
618 * freelist management in the buddy allocator.
619 * page_count() > 0 means the page has been allocated.
621 * Pages are allocated by the slab allocator in order to provide memory
622 * to kmalloc and kmem_cache_alloc. In this case, the management of the
623 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
624 * unless a particular usage is carefully commented. (the responsibility of
625 * freeing the kmalloc memory is the caller's, of course).
627 * A page may be used by anyone else who does a __get_free_page().
628 * In this case, page_count still tracks the references, and should only
629 * be used through the normal accessor functions. The top bits of page->flags
630 * and page->virtual store page management information, but all other fields
631 * are unused and could be used privately, carefully. The management of this
632 * page is the responsibility of the one who allocated it, and those who have
633 * subsequently been given references to it.
635 * The other pages (we may call them "pagecache pages") are completely
636 * managed by the Linux memory manager: I/O, buffers, swapping etc.
637 * The following discussion applies only to them.
639 * A pagecache page contains an opaque `private' member, which belongs to the
640 * page's address_space. Usually, this is the address of a circular list of
641 * the page's disk buffers. PG_private must be set to tell the VM to call
642 * into the filesystem to release these pages.
644 * A page may belong to an inode's memory mapping. In this case, page->mapping
645 * is the pointer to the inode, and page->index is the file offset of the page,
646 * in units of PAGE_CACHE_SIZE.
648 * If pagecache pages are not associated with an inode, they are said to be
649 * anonymous pages. These may become associated with the swapcache, and in that
650 * case PG_swapcache is set, and page->private is an offset into the swapcache.
652 * In either case (swapcache or inode backed), the pagecache itself holds one
653 * reference to the page. Setting PG_private should also increment the
654 * refcount. The each user mapping also has a reference to the page.
656 * The pagecache pages are stored in a per-mapping radix tree, which is
657 * rooted at mapping->page_tree, and indexed by offset.
658 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
659 * lists, we instead now tag pages as dirty/writeback in the radix tree.
661 * All pagecache pages may be subject to I/O:
662 * - inode pages may need to be read from disk,
663 * - inode pages which have been modified and are MAP_SHARED may need
664 * to be written back to the inode on disk,
665 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
666 * modified may need to be swapped out to swap space and (later) to be read
671 * The zone field is never updated after free_area_init_core()
672 * sets it, so none of the operations on it need to be atomic.
675 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
676 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
677 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
678 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
679 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
682 * Define the bit shifts to access each section. For non-existent
683 * sections we define the shift as 0; that plus a 0 mask ensures
684 * the compiler will optimise away reference to them.
686 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
687 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
688 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
689 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
691 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
692 #ifdef NODE_NOT_IN_PAGE_FLAGS
693 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
694 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
695 SECTIONS_PGOFF : ZONES_PGOFF)
697 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
698 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
699 NODES_PGOFF : ZONES_PGOFF)
702 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
704 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
705 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
708 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
709 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
710 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
711 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
712 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
714 static inline enum zone_type
page_zonenum(const struct page
*page
)
716 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
719 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
720 #define SECTION_IN_PAGE_FLAGS
724 * The identification function is mainly used by the buddy allocator for
725 * determining if two pages could be buddies. We are not really identifying
726 * the zone since we could be using the section number id if we do not have
727 * node id available in page flags.
728 * We only guarantee that it will return the same value for two combinable
731 static inline int page_zone_id(struct page
*page
)
733 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
736 static inline int zone_to_nid(struct zone
*zone
)
745 #ifdef NODE_NOT_IN_PAGE_FLAGS
746 extern int page_to_nid(const struct page
*page
);
748 static inline int page_to_nid(const struct page
*page
)
750 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
754 #ifdef CONFIG_NUMA_BALANCING
755 static inline int cpu_pid_to_cpupid(int cpu
, int pid
)
757 return ((cpu
& LAST__CPU_MASK
) << LAST__PID_SHIFT
) | (pid
& LAST__PID_MASK
);
760 static inline int cpupid_to_pid(int cpupid
)
762 return cpupid
& LAST__PID_MASK
;
765 static inline int cpupid_to_cpu(int cpupid
)
767 return (cpupid
>> LAST__PID_SHIFT
) & LAST__CPU_MASK
;
770 static inline int cpupid_to_nid(int cpupid
)
772 return cpu_to_node(cpupid_to_cpu(cpupid
));
775 static inline bool cpupid_pid_unset(int cpupid
)
777 return cpupid_to_pid(cpupid
) == (-1 & LAST__PID_MASK
);
780 static inline bool cpupid_cpu_unset(int cpupid
)
782 return cpupid_to_cpu(cpupid
) == (-1 & LAST__CPU_MASK
);
785 static inline bool __cpupid_match_pid(pid_t task_pid
, int cpupid
)
787 return (task_pid
& LAST__PID_MASK
) == cpupid_to_pid(cpupid
);
790 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
791 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
792 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
794 return xchg(&page
->_last_cpupid
, cpupid
& LAST_CPUPID_MASK
);
797 static inline int page_cpupid_last(struct page
*page
)
799 return page
->_last_cpupid
;
801 static inline void page_cpupid_reset_last(struct page
*page
)
803 page
->_last_cpupid
= -1 & LAST_CPUPID_MASK
;
806 static inline int page_cpupid_last(struct page
*page
)
808 return (page
->flags
>> LAST_CPUPID_PGSHIFT
) & LAST_CPUPID_MASK
;
811 extern int page_cpupid_xchg_last(struct page
*page
, int cpupid
);
813 static inline void page_cpupid_reset_last(struct page
*page
)
815 int cpupid
= (1 << LAST_CPUPID_SHIFT
) - 1;
817 page
->flags
&= ~(LAST_CPUPID_MASK
<< LAST_CPUPID_PGSHIFT
);
818 page
->flags
|= (cpupid
& LAST_CPUPID_MASK
) << LAST_CPUPID_PGSHIFT
;
820 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
821 #else /* !CONFIG_NUMA_BALANCING */
822 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
824 return page_to_nid(page
); /* XXX */
827 static inline int page_cpupid_last(struct page
*page
)
829 return page_to_nid(page
); /* XXX */
832 static inline int cpupid_to_nid(int cpupid
)
837 static inline int cpupid_to_pid(int cpupid
)
842 static inline int cpupid_to_cpu(int cpupid
)
847 static inline int cpu_pid_to_cpupid(int nid
, int pid
)
852 static inline bool cpupid_pid_unset(int cpupid
)
857 static inline void page_cpupid_reset_last(struct page
*page
)
861 static inline bool cpupid_match_pid(struct task_struct
*task
, int cpupid
)
865 #endif /* CONFIG_NUMA_BALANCING */
867 static inline struct zone
*page_zone(const struct page
*page
)
869 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
872 #ifdef SECTION_IN_PAGE_FLAGS
873 static inline void set_page_section(struct page
*page
, unsigned long section
)
875 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
876 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
879 static inline unsigned long page_to_section(const struct page
*page
)
881 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
885 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
887 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
888 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
891 static inline void set_page_node(struct page
*page
, unsigned long node
)
893 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
894 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
897 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
898 unsigned long node
, unsigned long pfn
)
900 set_page_zone(page
, zone
);
901 set_page_node(page
, node
);
902 #ifdef SECTION_IN_PAGE_FLAGS
903 set_page_section(page
, pfn_to_section_nr(pfn
));
908 * Some inline functions in vmstat.h depend on page_zone()
910 #include <linux/vmstat.h>
912 static __always_inline
void *lowmem_page_address(const struct page
*page
)
914 return __va(PFN_PHYS(page_to_pfn(page
)));
917 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
918 #define HASHED_PAGE_VIRTUAL
921 #if defined(WANT_PAGE_VIRTUAL)
922 static inline void *page_address(const struct page
*page
)
924 return page
->virtual;
926 static inline void set_page_address(struct page
*page
, void *address
)
928 page
->virtual = address
;
930 #define page_address_init() do { } while(0)
933 #if defined(HASHED_PAGE_VIRTUAL)
934 void *page_address(const struct page
*page
);
935 void set_page_address(struct page
*page
, void *virtual);
936 void page_address_init(void);
939 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
940 #define page_address(page) lowmem_page_address(page)
941 #define set_page_address(page, address) do { } while(0)
942 #define page_address_init() do { } while(0)
946 * On an anonymous page mapped into a user virtual memory area,
947 * page->mapping points to its anon_vma, not to a struct address_space;
948 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
950 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
951 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
952 * and then page->mapping points, not to an anon_vma, but to a private
953 * structure which KSM associates with that merged page. See ksm.h.
955 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
957 * Please note that, confusingly, "page_mapping" refers to the inode
958 * address_space which maps the page from disk; whereas "page_mapped"
959 * refers to user virtual address space into which the page is mapped.
961 #define PAGE_MAPPING_ANON 1
962 #define PAGE_MAPPING_KSM 2
963 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
965 extern struct address_space
*page_mapping(struct page
*page
);
967 /* Neutral page->mapping pointer to address_space or anon_vma or other */
968 static inline void *page_rmapping(struct page
*page
)
970 return (void *)((unsigned long)page
->mapping
& ~PAGE_MAPPING_FLAGS
);
973 extern struct address_space
*__page_file_mapping(struct page
*);
976 struct address_space
*page_file_mapping(struct page
*page
)
978 if (unlikely(PageSwapCache(page
)))
979 return __page_file_mapping(page
);
981 return page
->mapping
;
984 static inline int PageAnon(struct page
*page
)
986 return ((unsigned long)page
->mapping
& PAGE_MAPPING_ANON
) != 0;
990 * Return the pagecache index of the passed page. Regular pagecache pages
991 * use ->index whereas swapcache pages use ->private
993 static inline pgoff_t
page_index(struct page
*page
)
995 if (unlikely(PageSwapCache(page
)))
996 return page_private(page
);
1000 extern pgoff_t
__page_file_index(struct page
*page
);
1003 * Return the file index of the page. Regular pagecache pages use ->index
1004 * whereas swapcache pages use swp_offset(->private)
1006 static inline pgoff_t
page_file_index(struct page
*page
)
1008 if (unlikely(PageSwapCache(page
)))
1009 return __page_file_index(page
);
1015 * Return true if this page is mapped into pagetables.
1017 static inline int page_mapped(struct page
*page
)
1019 return atomic_read(&(page
)->_mapcount
) >= 0;
1023 * Different kinds of faults, as returned by handle_mm_fault().
1024 * Used to decide whether a process gets delivered SIGBUS or
1025 * just gets major/minor fault counters bumped up.
1028 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1030 #define VM_FAULT_OOM 0x0001
1031 #define VM_FAULT_SIGBUS 0x0002
1032 #define VM_FAULT_MAJOR 0x0004
1033 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1034 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1035 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1037 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1038 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1039 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1040 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1042 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1044 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
1045 VM_FAULT_FALLBACK | VM_FAULT_HWPOISON_LARGE)
1047 /* Encode hstate index for a hwpoisoned large page */
1048 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1049 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1052 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1054 extern void pagefault_out_of_memory(void);
1056 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1059 * Flags passed to show_mem() and show_free_areas() to suppress output in
1062 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1064 extern void show_free_areas(unsigned int flags
);
1065 extern bool skip_free_areas_node(unsigned int flags
, int nid
);
1067 int shmem_zero_setup(struct vm_area_struct
*);
1069 bool shmem_mapping(struct address_space
*mapping
);
1071 static inline bool shmem_mapping(struct address_space
*mapping
)
1077 extern int can_do_mlock(void);
1078 extern int user_shm_lock(size_t, struct user_struct
*);
1079 extern void user_shm_unlock(size_t, struct user_struct
*);
1082 * Parameter block passed down to zap_pte_range in exceptional cases.
1084 struct zap_details
{
1085 struct vm_area_struct
*nonlinear_vma
; /* Check page->index if set */
1086 struct address_space
*check_mapping
; /* Check page->mapping if set */
1087 pgoff_t first_index
; /* Lowest page->index to unmap */
1088 pgoff_t last_index
; /* Highest page->index to unmap */
1091 struct page
*vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
1094 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
1095 unsigned long size
);
1096 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
1097 unsigned long size
, struct zap_details
*);
1098 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
1099 unsigned long start
, unsigned long end
);
1102 * mm_walk - callbacks for walk_page_range
1103 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
1104 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1105 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1106 * this handler is required to be able to handle
1107 * pmd_trans_huge() pmds. They may simply choose to
1108 * split_huge_page() instead of handling it explicitly.
1109 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1110 * @pte_hole: if set, called for each hole at all levels
1111 * @hugetlb_entry: if set, called for each hugetlb entry
1112 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
1115 * (see walk_page_range for more details)
1118 int (*pgd_entry
)(pgd_t
*pgd
, unsigned long addr
,
1119 unsigned long next
, struct mm_walk
*walk
);
1120 int (*pud_entry
)(pud_t
*pud
, unsigned long addr
,
1121 unsigned long next
, struct mm_walk
*walk
);
1122 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
1123 unsigned long next
, struct mm_walk
*walk
);
1124 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
1125 unsigned long next
, struct mm_walk
*walk
);
1126 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
1127 struct mm_walk
*walk
);
1128 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
1129 unsigned long addr
, unsigned long next
,
1130 struct mm_walk
*walk
);
1131 struct mm_struct
*mm
;
1135 int walk_page_range(unsigned long addr
, unsigned long end
,
1136 struct mm_walk
*walk
);
1137 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1138 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1139 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1140 struct vm_area_struct
*vma
);
1141 void unmap_mapping_range(struct address_space
*mapping
,
1142 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1143 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1144 unsigned long *pfn
);
1145 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1146 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1147 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1148 void *buf
, int len
, int write
);
1150 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1151 loff_t
const holebegin
, loff_t
const holelen
)
1153 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1156 extern void truncate_pagecache(struct inode
*inode
, loff_t
new);
1157 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1158 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1159 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1160 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1161 int invalidate_inode_page(struct page
*page
);
1164 extern int handle_mm_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1165 unsigned long address
, unsigned int flags
);
1166 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1167 unsigned long address
, unsigned int fault_flags
);
1169 static inline int handle_mm_fault(struct mm_struct
*mm
,
1170 struct vm_area_struct
*vma
, unsigned long address
,
1173 /* should never happen if there's no MMU */
1175 return VM_FAULT_SIGBUS
;
1177 static inline int fixup_user_fault(struct task_struct
*tsk
,
1178 struct mm_struct
*mm
, unsigned long address
,
1179 unsigned int fault_flags
)
1181 /* should never happen if there's no MMU */
1187 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
1188 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1189 void *buf
, int len
, int write
);
1191 long __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1192 unsigned long start
, unsigned long nr_pages
,
1193 unsigned int foll_flags
, struct page
**pages
,
1194 struct vm_area_struct
**vmas
, int *nonblocking
);
1195 long get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1196 unsigned long start
, unsigned long nr_pages
,
1197 int write
, int force
, struct page
**pages
,
1198 struct vm_area_struct
**vmas
);
1199 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1200 struct page
**pages
);
1202 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1203 struct page
**pages
);
1204 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1205 struct page
*get_dump_page(unsigned long addr
);
1207 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1208 extern void do_invalidatepage(struct page
*page
, unsigned int offset
,
1209 unsigned int length
);
1211 int __set_page_dirty_nobuffers(struct page
*page
);
1212 int __set_page_dirty_no_writeback(struct page
*page
);
1213 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1215 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1216 void account_page_writeback(struct page
*page
);
1217 int set_page_dirty(struct page
*page
);
1218 int set_page_dirty_lock(struct page
*page
);
1219 int clear_page_dirty_for_io(struct page
*page
);
1220 int get_cmdline(struct task_struct
*task
, char *buffer
, int buflen
);
1222 /* Is the vma a continuation of the stack vma above it? */
1223 static inline int vma_growsdown(struct vm_area_struct
*vma
, unsigned long addr
)
1225 return vma
&& (vma
->vm_end
== addr
) && (vma
->vm_flags
& VM_GROWSDOWN
);
1228 static inline int stack_guard_page_start(struct vm_area_struct
*vma
,
1231 return (vma
->vm_flags
& VM_GROWSDOWN
) &&
1232 (vma
->vm_start
== addr
) &&
1233 !vma_growsdown(vma
->vm_prev
, addr
);
1236 /* Is the vma a continuation of the stack vma below it? */
1237 static inline int vma_growsup(struct vm_area_struct
*vma
, unsigned long addr
)
1239 return vma
&& (vma
->vm_start
== addr
) && (vma
->vm_flags
& VM_GROWSUP
);
1242 static inline int stack_guard_page_end(struct vm_area_struct
*vma
,
1245 return (vma
->vm_flags
& VM_GROWSUP
) &&
1246 (vma
->vm_end
== addr
) &&
1247 !vma_growsup(vma
->vm_next
, addr
);
1251 vm_is_stack(struct task_struct
*task
, struct vm_area_struct
*vma
, int in_group
);
1253 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1254 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1255 unsigned long new_addr
, unsigned long len
,
1256 bool need_rmap_locks
);
1257 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1258 unsigned long end
, pgprot_t newprot
,
1259 int dirty_accountable
, int prot_numa
);
1260 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1261 struct vm_area_struct
**pprev
, unsigned long start
,
1262 unsigned long end
, unsigned long newflags
);
1265 * doesn't attempt to fault and will return short.
1267 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1268 struct page
**pages
);
1270 * per-process(per-mm_struct) statistics.
1272 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1274 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1276 #ifdef SPLIT_RSS_COUNTING
1278 * counter is updated in asynchronous manner and may go to minus.
1279 * But it's never be expected number for users.
1284 return (unsigned long)val
;
1287 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1289 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1292 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1294 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1297 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1299 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1302 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1304 return get_mm_counter(mm
, MM_FILEPAGES
) +
1305 get_mm_counter(mm
, MM_ANONPAGES
);
1308 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1310 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1313 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1315 return max(mm
->hiwater_vm
, mm
->total_vm
);
1318 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1320 unsigned long _rss
= get_mm_rss(mm
);
1322 if ((mm
)->hiwater_rss
< _rss
)
1323 (mm
)->hiwater_rss
= _rss
;
1326 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1328 if (mm
->hiwater_vm
< mm
->total_vm
)
1329 mm
->hiwater_vm
= mm
->total_vm
;
1332 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1333 struct mm_struct
*mm
)
1335 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1337 if (*maxrss
< hiwater_rss
)
1338 *maxrss
= hiwater_rss
;
1341 #if defined(SPLIT_RSS_COUNTING)
1342 void sync_mm_rss(struct mm_struct
*mm
);
1344 static inline void sync_mm_rss(struct mm_struct
*mm
)
1349 int vma_wants_writenotify(struct vm_area_struct
*vma
);
1351 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1353 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1357 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1361 #ifdef __PAGETABLE_PUD_FOLDED
1362 static inline int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1363 unsigned long address
)
1368 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1371 #ifdef __PAGETABLE_PMD_FOLDED
1372 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1373 unsigned long address
)
1378 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1381 int __pte_alloc(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1382 pmd_t
*pmd
, unsigned long address
);
1383 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1386 * The following ifdef needed to get the 4level-fixup.h header to work.
1387 * Remove it when 4level-fixup.h has been removed.
1389 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1390 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
1392 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
1393 NULL
: pud_offset(pgd
, address
);
1396 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1398 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1399 NULL
: pmd_offset(pud
, address
);
1401 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1403 #if USE_SPLIT_PTE_PTLOCKS
1404 #if ALLOC_SPLIT_PTLOCKS
1405 void __init
ptlock_cache_init(void);
1406 extern bool ptlock_alloc(struct page
*page
);
1407 extern void ptlock_free(struct page
*page
);
1409 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1413 #else /* ALLOC_SPLIT_PTLOCKS */
1414 static inline void ptlock_cache_init(void)
1418 static inline bool ptlock_alloc(struct page
*page
)
1423 static inline void ptlock_free(struct page
*page
)
1427 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1431 #endif /* ALLOC_SPLIT_PTLOCKS */
1433 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1435 return ptlock_ptr(pmd_page(*pmd
));
1438 static inline bool ptlock_init(struct page
*page
)
1441 * prep_new_page() initialize page->private (and therefore page->ptl)
1442 * with 0. Make sure nobody took it in use in between.
1444 * It can happen if arch try to use slab for page table allocation:
1445 * slab code uses page->slab_cache and page->first_page (for tail
1446 * pages), which share storage with page->ptl.
1448 VM_BUG_ON_PAGE(*(unsigned long *)&page
->ptl
, page
);
1449 if (!ptlock_alloc(page
))
1451 spin_lock_init(ptlock_ptr(page
));
1455 /* Reset page->mapping so free_pages_check won't complain. */
1456 static inline void pte_lock_deinit(struct page
*page
)
1458 page
->mapping
= NULL
;
1462 #else /* !USE_SPLIT_PTE_PTLOCKS */
1464 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1466 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1468 return &mm
->page_table_lock
;
1470 static inline void ptlock_cache_init(void) {}
1471 static inline bool ptlock_init(struct page
*page
) { return true; }
1472 static inline void pte_lock_deinit(struct page
*page
) {}
1473 #endif /* USE_SPLIT_PTE_PTLOCKS */
1475 static inline void pgtable_init(void)
1477 ptlock_cache_init();
1478 pgtable_cache_init();
1481 static inline bool pgtable_page_ctor(struct page
*page
)
1483 inc_zone_page_state(page
, NR_PAGETABLE
);
1484 return ptlock_init(page
);
1487 static inline void pgtable_page_dtor(struct page
*page
)
1489 pte_lock_deinit(page
);
1490 dec_zone_page_state(page
, NR_PAGETABLE
);
1493 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1495 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1496 pte_t *__pte = pte_offset_map(pmd, address); \
1502 #define pte_unmap_unlock(pte, ptl) do { \
1507 #define pte_alloc_map(mm, vma, pmd, address) \
1508 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1510 NULL: pte_offset_map(pmd, address))
1512 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1513 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1515 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1517 #define pte_alloc_kernel(pmd, address) \
1518 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1519 NULL: pte_offset_kernel(pmd, address))
1521 #if USE_SPLIT_PMD_PTLOCKS
1523 static struct page
*pmd_to_page(pmd_t
*pmd
)
1525 unsigned long mask
= ~(PTRS_PER_PMD
* sizeof(pmd_t
) - 1);
1526 return virt_to_page((void *)((unsigned long) pmd
& mask
));
1529 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1531 return ptlock_ptr(pmd_to_page(pmd
));
1534 static inline bool pgtable_pmd_page_ctor(struct page
*page
)
1536 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1537 page
->pmd_huge_pte
= NULL
;
1539 return ptlock_init(page
);
1542 static inline void pgtable_pmd_page_dtor(struct page
*page
)
1544 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1545 VM_BUG_ON_PAGE(page
->pmd_huge_pte
, page
);
1550 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1554 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1556 return &mm
->page_table_lock
;
1559 static inline bool pgtable_pmd_page_ctor(struct page
*page
) { return true; }
1560 static inline void pgtable_pmd_page_dtor(struct page
*page
) {}
1562 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1566 static inline spinlock_t
*pmd_lock(struct mm_struct
*mm
, pmd_t
*pmd
)
1568 spinlock_t
*ptl
= pmd_lockptr(mm
, pmd
);
1573 extern void free_area_init(unsigned long * zones_size
);
1574 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1575 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1576 extern void free_initmem(void);
1579 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1580 * into the buddy system. The freed pages will be poisoned with pattern
1581 * "poison" if it's within range [0, UCHAR_MAX].
1582 * Return pages freed into the buddy system.
1584 extern unsigned long free_reserved_area(void *start
, void *end
,
1585 int poison
, char *s
);
1587 #ifdef CONFIG_HIGHMEM
1589 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1590 * and totalram_pages.
1592 extern void free_highmem_page(struct page
*page
);
1595 extern void adjust_managed_page_count(struct page
*page
, long count
);
1596 extern void mem_init_print_info(const char *str
);
1598 /* Free the reserved page into the buddy system, so it gets managed. */
1599 static inline void __free_reserved_page(struct page
*page
)
1601 ClearPageReserved(page
);
1602 init_page_count(page
);
1606 static inline void free_reserved_page(struct page
*page
)
1608 __free_reserved_page(page
);
1609 adjust_managed_page_count(page
, 1);
1612 static inline void mark_page_reserved(struct page
*page
)
1614 SetPageReserved(page
);
1615 adjust_managed_page_count(page
, -1);
1619 * Default method to free all the __init memory into the buddy system.
1620 * The freed pages will be poisoned with pattern "poison" if it's within
1621 * range [0, UCHAR_MAX].
1622 * Return pages freed into the buddy system.
1624 static inline unsigned long free_initmem_default(int poison
)
1626 extern char __init_begin
[], __init_end
[];
1628 return free_reserved_area(&__init_begin
, &__init_end
,
1629 poison
, "unused kernel");
1632 static inline unsigned long get_num_physpages(void)
1635 unsigned long phys_pages
= 0;
1637 for_each_online_node(nid
)
1638 phys_pages
+= node_present_pages(nid
);
1643 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1645 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1646 * zones, allocate the backing mem_map and account for memory holes in a more
1647 * architecture independent manner. This is a substitute for creating the
1648 * zone_sizes[] and zholes_size[] arrays and passing them to
1649 * free_area_init_node()
1651 * An architecture is expected to register range of page frames backed by
1652 * physical memory with memblock_add[_node]() before calling
1653 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1654 * usage, an architecture is expected to do something like
1656 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1658 * for_each_valid_physical_page_range()
1659 * memblock_add_node(base, size, nid)
1660 * free_area_init_nodes(max_zone_pfns);
1662 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1663 * registered physical page range. Similarly
1664 * sparse_memory_present_with_active_regions() calls memory_present() for
1665 * each range when SPARSEMEM is enabled.
1667 * See mm/page_alloc.c for more information on each function exposed by
1668 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1670 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1671 unsigned long node_map_pfn_alignment(void);
1672 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1673 unsigned long end_pfn
);
1674 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1675 unsigned long end_pfn
);
1676 extern void get_pfn_range_for_nid(unsigned int nid
,
1677 unsigned long *start_pfn
, unsigned long *end_pfn
);
1678 extern unsigned long find_min_pfn_with_active_regions(void);
1679 extern void free_bootmem_with_active_regions(int nid
,
1680 unsigned long max_low_pfn
);
1681 extern void sparse_memory_present_with_active_regions(int nid
);
1683 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1685 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1686 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1687 static inline int __early_pfn_to_nid(unsigned long pfn
)
1692 /* please see mm/page_alloc.c */
1693 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1694 /* there is a per-arch backend function. */
1695 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
);
1698 extern void set_dma_reserve(unsigned long new_dma_reserve
);
1699 extern void memmap_init_zone(unsigned long, int, unsigned long,
1700 unsigned long, enum memmap_context
);
1701 extern void setup_per_zone_wmarks(void);
1702 extern int __meminit
init_per_zone_wmark_min(void);
1703 extern void mem_init(void);
1704 extern void __init
mmap_init(void);
1705 extern void show_mem(unsigned int flags
);
1706 extern void si_meminfo(struct sysinfo
* val
);
1707 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
1709 extern __printf(3, 4)
1710 void warn_alloc_failed(gfp_t gfp_mask
, int order
, const char *fmt
, ...);
1712 extern void setup_per_cpu_pageset(void);
1714 extern void zone_pcp_update(struct zone
*zone
);
1715 extern void zone_pcp_reset(struct zone
*zone
);
1718 extern int min_free_kbytes
;
1721 extern atomic_long_t mmap_pages_allocated
;
1722 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
1724 /* interval_tree.c */
1725 void vma_interval_tree_insert(struct vm_area_struct
*node
,
1726 struct rb_root
*root
);
1727 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
1728 struct vm_area_struct
*prev
,
1729 struct rb_root
*root
);
1730 void vma_interval_tree_remove(struct vm_area_struct
*node
,
1731 struct rb_root
*root
);
1732 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root
*root
,
1733 unsigned long start
, unsigned long last
);
1734 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
1735 unsigned long start
, unsigned long last
);
1737 #define vma_interval_tree_foreach(vma, root, start, last) \
1738 for (vma = vma_interval_tree_iter_first(root, start, last); \
1739 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1741 static inline void vma_nonlinear_insert(struct vm_area_struct
*vma
,
1742 struct list_head
*list
)
1744 list_add_tail(&vma
->shared
.nonlinear
, list
);
1747 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
1748 struct rb_root
*root
);
1749 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
1750 struct rb_root
*root
);
1751 struct anon_vma_chain
*anon_vma_interval_tree_iter_first(
1752 struct rb_root
*root
, unsigned long start
, unsigned long last
);
1753 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
1754 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
1755 #ifdef CONFIG_DEBUG_VM_RB
1756 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
1759 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1760 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1761 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1764 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
1765 extern int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
1766 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
1767 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
1768 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
1769 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
1770 struct mempolicy
*);
1771 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
1772 extern int split_vma(struct mm_struct
*,
1773 struct vm_area_struct
*, unsigned long addr
, int new_below
);
1774 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
1775 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
1776 struct rb_node
**, struct rb_node
*);
1777 extern void unlink_file_vma(struct vm_area_struct
*);
1778 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
1779 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
1780 bool *need_rmap_locks
);
1781 extern void exit_mmap(struct mm_struct
*);
1783 extern int mm_take_all_locks(struct mm_struct
*mm
);
1784 extern void mm_drop_all_locks(struct mm_struct
*mm
);
1786 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
1787 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
1789 extern int may_expand_vm(struct mm_struct
*mm
, unsigned long npages
);
1790 extern struct vm_area_struct
*_install_special_mapping(struct mm_struct
*mm
,
1791 unsigned long addr
, unsigned long len
,
1792 unsigned long flags
,
1793 const struct vm_special_mapping
*spec
);
1794 /* This is an obsolete alternative to _install_special_mapping. */
1795 extern int install_special_mapping(struct mm_struct
*mm
,
1796 unsigned long addr
, unsigned long len
,
1797 unsigned long flags
, struct page
**pages
);
1799 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1801 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
1802 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
);
1803 extern unsigned long do_mmap_pgoff(struct file
*file
, unsigned long addr
,
1804 unsigned long len
, unsigned long prot
, unsigned long flags
,
1805 unsigned long pgoff
, unsigned long *populate
);
1806 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
1809 extern int __mm_populate(unsigned long addr
, unsigned long len
,
1811 static inline void mm_populate(unsigned long addr
, unsigned long len
)
1814 (void) __mm_populate(addr
, len
, 1);
1817 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
1820 /* These take the mm semaphore themselves */
1821 extern unsigned long vm_brk(unsigned long, unsigned long);
1822 extern int vm_munmap(unsigned long, size_t);
1823 extern unsigned long vm_mmap(struct file
*, unsigned long,
1824 unsigned long, unsigned long,
1825 unsigned long, unsigned long);
1827 struct vm_unmapped_area_info
{
1828 #define VM_UNMAPPED_AREA_TOPDOWN 1
1829 unsigned long flags
;
1830 unsigned long length
;
1831 unsigned long low_limit
;
1832 unsigned long high_limit
;
1833 unsigned long align_mask
;
1834 unsigned long align_offset
;
1837 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
1838 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
1841 * Search for an unmapped address range.
1843 * We are looking for a range that:
1844 * - does not intersect with any VMA;
1845 * - is contained within the [low_limit, high_limit) interval;
1846 * - is at least the desired size.
1847 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1849 static inline unsigned long
1850 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
1852 if (!(info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
))
1853 return unmapped_area(info
);
1855 return unmapped_area_topdown(info
);
1859 extern void truncate_inode_pages(struct address_space
*, loff_t
);
1860 extern void truncate_inode_pages_range(struct address_space
*,
1861 loff_t lstart
, loff_t lend
);
1862 extern void truncate_inode_pages_final(struct address_space
*);
1864 /* generic vm_area_ops exported for stackable file systems */
1865 extern int filemap_fault(struct vm_area_struct
*, struct vm_fault
*);
1866 extern void filemap_map_pages(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1867 extern int filemap_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1869 /* mm/page-writeback.c */
1870 int write_one_page(struct page
*page
, int wait
);
1871 void task_dirty_inc(struct task_struct
*tsk
);
1874 #define VM_MAX_READAHEAD 128 /* kbytes */
1875 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1877 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
1878 pgoff_t offset
, unsigned long nr_to_read
);
1880 void page_cache_sync_readahead(struct address_space
*mapping
,
1881 struct file_ra_state
*ra
,
1884 unsigned long size
);
1886 void page_cache_async_readahead(struct address_space
*mapping
,
1887 struct file_ra_state
*ra
,
1891 unsigned long size
);
1893 unsigned long max_sane_readahead(unsigned long nr
);
1895 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1896 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
1898 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1899 extern int expand_downwards(struct vm_area_struct
*vma
,
1900 unsigned long address
);
1902 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
1904 #define expand_upwards(vma, address) do { } while (0)
1907 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1908 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
1909 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
1910 struct vm_area_struct
**pprev
);
1912 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1913 NULL if none. Assume start_addr < end_addr. */
1914 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
1916 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
1918 if (vma
&& end_addr
<= vma
->vm_start
)
1923 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
1925 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
1928 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1929 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
1930 unsigned long vm_start
, unsigned long vm_end
)
1932 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
1934 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
1941 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
1943 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
1949 #ifdef CONFIG_NUMA_BALANCING
1950 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
1951 unsigned long start
, unsigned long end
);
1954 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
1955 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
1956 unsigned long pfn
, unsigned long size
, pgprot_t
);
1957 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
1958 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
1960 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
1962 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
1965 struct page
*follow_page_mask(struct vm_area_struct
*vma
,
1966 unsigned long address
, unsigned int foll_flags
,
1967 unsigned int *page_mask
);
1969 static inline struct page
*follow_page(struct vm_area_struct
*vma
,
1970 unsigned long address
, unsigned int foll_flags
)
1972 unsigned int unused_page_mask
;
1973 return follow_page_mask(vma
, address
, foll_flags
, &unused_page_mask
);
1976 #define FOLL_WRITE 0x01 /* check pte is writable */
1977 #define FOLL_TOUCH 0x02 /* mark page accessed */
1978 #define FOLL_GET 0x04 /* do get_page on page */
1979 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1980 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1981 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
1982 * and return without waiting upon it */
1983 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
1984 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
1985 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
1986 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
1987 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
1989 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
1991 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
1992 unsigned long size
, pte_fn_t fn
, void *data
);
1994 #ifdef CONFIG_PROC_FS
1995 void vm_stat_account(struct mm_struct
*, unsigned long, struct file
*, long);
1997 static inline void vm_stat_account(struct mm_struct
*mm
,
1998 unsigned long flags
, struct file
*file
, long pages
)
2000 mm
->total_vm
+= pages
;
2002 #endif /* CONFIG_PROC_FS */
2004 #ifdef CONFIG_DEBUG_PAGEALLOC
2005 extern void kernel_map_pages(struct page
*page
, int numpages
, int enable
);
2006 #ifdef CONFIG_HIBERNATION
2007 extern bool kernel_page_present(struct page
*page
);
2008 #endif /* CONFIG_HIBERNATION */
2011 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
2012 #ifdef CONFIG_HIBERNATION
2013 static inline bool kernel_page_present(struct page
*page
) { return true; }
2014 #endif /* CONFIG_HIBERNATION */
2017 #ifdef __HAVE_ARCH_GATE_AREA
2018 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
2019 extern int in_gate_area_no_mm(unsigned long addr
);
2020 extern int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
2022 static inline struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
)
2026 static inline int in_gate_area_no_mm(unsigned long addr
) { return 0; }
2027 static inline int in_gate_area(struct mm_struct
*mm
, unsigned long addr
)
2031 #endif /* __HAVE_ARCH_GATE_AREA */
2033 #ifdef CONFIG_SYSCTL
2034 extern int sysctl_drop_caches
;
2035 int drop_caches_sysctl_handler(struct ctl_table
*, int,
2036 void __user
*, size_t *, loff_t
*);
2039 unsigned long shrink_slab(struct shrink_control
*shrink
,
2040 unsigned long nr_pages_scanned
,
2041 unsigned long lru_pages
);
2044 #define randomize_va_space 0
2046 extern int randomize_va_space
;
2049 const char * arch_vma_name(struct vm_area_struct
*vma
);
2050 void print_vma_addr(char *prefix
, unsigned long rip
);
2052 void sparse_mem_maps_populate_node(struct page
**map_map
,
2053 unsigned long pnum_begin
,
2054 unsigned long pnum_end
,
2055 unsigned long map_count
,
2058 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
2059 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
2060 pud_t
*vmemmap_pud_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
2061 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
2062 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
2063 void *vmemmap_alloc_block(unsigned long size
, int node
);
2064 void *vmemmap_alloc_block_buf(unsigned long size
, int node
);
2065 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
2066 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
2068 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
);
2069 void vmemmap_populate_print_last(void);
2070 #ifdef CONFIG_MEMORY_HOTPLUG
2071 void vmemmap_free(unsigned long start
, unsigned long end
);
2073 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
2074 unsigned long size
);
2077 MF_COUNT_INCREASED
= 1 << 0,
2078 MF_ACTION_REQUIRED
= 1 << 1,
2079 MF_MUST_KILL
= 1 << 2,
2080 MF_SOFT_OFFLINE
= 1 << 3,
2082 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
2083 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
2084 extern int unpoison_memory(unsigned long pfn
);
2085 extern int sysctl_memory_failure_early_kill
;
2086 extern int sysctl_memory_failure_recovery
;
2087 extern void shake_page(struct page
*p
, int access
);
2088 extern atomic_long_t num_poisoned_pages
;
2089 extern int soft_offline_page(struct page
*page
, int flags
);
2091 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2092 extern void clear_huge_page(struct page
*page
,
2094 unsigned int pages_per_huge_page
);
2095 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
2096 unsigned long addr
, struct vm_area_struct
*vma
,
2097 unsigned int pages_per_huge_page
);
2098 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2100 #ifdef CONFIG_DEBUG_PAGEALLOC
2101 extern unsigned int _debug_guardpage_minorder
;
2103 static inline unsigned int debug_guardpage_minorder(void)
2105 return _debug_guardpage_minorder
;
2108 static inline bool page_is_guard(struct page
*page
)
2110 return test_bit(PAGE_DEBUG_FLAG_GUARD
, &page
->debug_flags
);
2113 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2114 static inline bool page_is_guard(struct page
*page
) { return false; }
2115 #endif /* CONFIG_DEBUG_PAGEALLOC */
2117 #if MAX_NUMNODES > 1
2118 void __init
setup_nr_node_ids(void);
2120 static inline void setup_nr_node_ids(void) {}
2123 #endif /* __KERNEL__ */
2124 #endif /* _LINUX_MM_H */