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_ARCH_1 0x01000000 /* Architecture-specific flag */
129 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
131 #ifdef CONFIG_MEM_SOFT_DIRTY
132 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
134 # define VM_SOFTDIRTY 0
137 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
138 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
139 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
140 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
142 #if defined(CONFIG_X86)
143 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
144 #elif defined(CONFIG_PPC)
145 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
146 #elif defined(CONFIG_PARISC)
147 # define VM_GROWSUP VM_ARCH_1
148 #elif defined(CONFIG_METAG)
149 # define VM_GROWSUP VM_ARCH_1
150 #elif defined(CONFIG_IA64)
151 # define VM_GROWSUP VM_ARCH_1
152 #elif !defined(CONFIG_MMU)
153 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
157 # define VM_GROWSUP VM_NONE
160 /* Bits set in the VMA until the stack is in its final location */
161 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
163 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
164 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
167 #ifdef CONFIG_STACK_GROWSUP
168 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
170 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
174 * Special vmas that are non-mergable, non-mlock()able.
175 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
177 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
179 /* This mask defines which mm->def_flags a process can inherit its parent */
180 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
183 * mapping from the currently active vm_flags protection bits (the
184 * low four bits) to a page protection mask..
186 extern pgprot_t protection_map[16];
188 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
189 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
190 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
191 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
192 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
193 #define FAULT_FLAG_TRIED 0x20 /* Second try */
194 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
197 * vm_fault is filled by the the pagefault handler and passed to the vma's
198 * ->fault function. The vma's ->fault is responsible for returning a bitmask
199 * of VM_FAULT_xxx flags that give details about how the fault was handled.
201 * pgoff should be used in favour of virtual_address, if possible.
204 unsigned int flags; /* FAULT_FLAG_xxx flags */
205 pgoff_t pgoff; /* Logical page offset based on vma */
206 void __user *virtual_address; /* Faulting virtual address */
208 struct page *page; /* ->fault handlers should return a
209 * page here, unless VM_FAULT_NOPAGE
210 * is set (which is also implied by
213 /* for ->map_pages() only */
214 pgoff_t max_pgoff; /* map pages for offset from pgoff till
215 * max_pgoff inclusive */
216 pte_t *pte; /* pte entry associated with ->pgoff */
220 * These are the virtual MM functions - opening of an area, closing and
221 * unmapping it (needed to keep files on disk up-to-date etc), pointer
222 * to the functions called when a no-page or a wp-page exception occurs.
224 struct vm_operations_struct {
225 void (*open)(struct vm_area_struct * area);
226 void (*close)(struct vm_area_struct * area);
227 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
228 void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
230 /* notification that a previously read-only page is about to become
231 * writable, if an error is returned it will cause a SIGBUS */
232 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
234 /* called by access_process_vm when get_user_pages() fails, typically
235 * for use by special VMAs that can switch between memory and hardware
237 int (*access)(struct vm_area_struct *vma, unsigned long addr,
238 void *buf, int len, int write);
240 /* Called by the /proc/PID/maps code to ask the vma whether it
241 * has a special name. Returning non-NULL will also cause this
242 * vma to be dumped unconditionally. */
243 const char *(*name)(struct vm_area_struct *vma);
247 * set_policy() op must add a reference to any non-NULL @new mempolicy
248 * to hold the policy upon return. Caller should pass NULL @new to
249 * remove a policy and fall back to surrounding context--i.e. do not
250 * install a MPOL_DEFAULT policy, nor the task or system default
253 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
256 * get_policy() op must add reference [mpol_get()] to any policy at
257 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
258 * in mm/mempolicy.c will do this automatically.
259 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
260 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
261 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
262 * must return NULL--i.e., do not "fallback" to task or system default
265 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
267 int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,
268 const nodemask_t *to, unsigned long flags);
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 #define PAGE_BALLOON_MAPCOUNT_VALUE (-256)
552 static inline int PageBalloon(struct page *page)
554 return atomic_read(&page->_mapcount) == PAGE_BALLOON_MAPCOUNT_VALUE;
557 static inline void __SetPageBalloon(struct page *page)
559 VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page);
560 atomic_set(&page->_mapcount, PAGE_BALLOON_MAPCOUNT_VALUE);
563 static inline void __ClearPageBalloon(struct page *page)
565 VM_BUG_ON_PAGE(!PageBalloon(page), page);
566 atomic_set(&page->_mapcount, -1);
569 void put_page(struct page *page);
570 void put_pages_list(struct list_head *pages);
572 void split_page(struct page *page, unsigned int order);
573 int split_free_page(struct page *page);
576 * Compound pages have a destructor function. Provide a
577 * prototype for that function and accessor functions.
578 * These are _only_ valid on the head of a PG_compound page.
580 typedef void compound_page_dtor(struct page *);
582 static inline void set_compound_page_dtor(struct page *page,
583 compound_page_dtor *dtor)
585 page[1].lru.next = (void *)dtor;
588 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
590 return (compound_page_dtor *)page[1].lru.next;
593 static inline int compound_order(struct page *page)
597 return (unsigned long)page[1].lru.prev;
600 static inline void set_compound_order(struct page *page, unsigned long order)
602 page[1].lru.prev = (void *)order;
607 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
608 * servicing faults for write access. In the normal case, do always want
609 * pte_mkwrite. But get_user_pages can cause write faults for mappings
610 * that do not have writing enabled, when used by access_process_vm.
612 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
614 if (likely(vma->vm_flags & VM_WRITE))
615 pte = pte_mkwrite(pte);
619 void do_set_pte(struct vm_area_struct *vma, unsigned long address,
620 struct page *page, pte_t *pte, bool write, bool anon);
624 * Multiple processes may "see" the same page. E.g. for untouched
625 * mappings of /dev/null, all processes see the same page full of
626 * zeroes, and text pages of executables and shared libraries have
627 * only one copy in memory, at most, normally.
629 * For the non-reserved pages, page_count(page) denotes a reference count.
630 * page_count() == 0 means the page is free. page->lru is then used for
631 * freelist management in the buddy allocator.
632 * page_count() > 0 means the page has been allocated.
634 * Pages are allocated by the slab allocator in order to provide memory
635 * to kmalloc and kmem_cache_alloc. In this case, the management of the
636 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
637 * unless a particular usage is carefully commented. (the responsibility of
638 * freeing the kmalloc memory is the caller's, of course).
640 * A page may be used by anyone else who does a __get_free_page().
641 * In this case, page_count still tracks the references, and should only
642 * be used through the normal accessor functions. The top bits of page->flags
643 * and page->virtual store page management information, but all other fields
644 * are unused and could be used privately, carefully. The management of this
645 * page is the responsibility of the one who allocated it, and those who have
646 * subsequently been given references to it.
648 * The other pages (we may call them "pagecache pages") are completely
649 * managed by the Linux memory manager: I/O, buffers, swapping etc.
650 * The following discussion applies only to them.
652 * A pagecache page contains an opaque `private' member, which belongs to the
653 * page's address_space. Usually, this is the address of a circular list of
654 * the page's disk buffers. PG_private must be set to tell the VM to call
655 * into the filesystem to release these pages.
657 * A page may belong to an inode's memory mapping. In this case, page->mapping
658 * is the pointer to the inode, and page->index is the file offset of the page,
659 * in units of PAGE_CACHE_SIZE.
661 * If pagecache pages are not associated with an inode, they are said to be
662 * anonymous pages. These may become associated with the swapcache, and in that
663 * case PG_swapcache is set, and page->private is an offset into the swapcache.
665 * In either case (swapcache or inode backed), the pagecache itself holds one
666 * reference to the page. Setting PG_private should also increment the
667 * refcount. The each user mapping also has a reference to the page.
669 * The pagecache pages are stored in a per-mapping radix tree, which is
670 * rooted at mapping->page_tree, and indexed by offset.
671 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
672 * lists, we instead now tag pages as dirty/writeback in the radix tree.
674 * All pagecache pages may be subject to I/O:
675 * - inode pages may need to be read from disk,
676 * - inode pages which have been modified and are MAP_SHARED may need
677 * to be written back to the inode on disk,
678 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
679 * modified may need to be swapped out to swap space and (later) to be read
684 * The zone field is never updated after free_area_init_core()
685 * sets it, so none of the operations on it need to be atomic.
688 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
689 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
690 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
691 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
692 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
695 * Define the bit shifts to access each section. For non-existent
696 * sections we define the shift as 0; that plus a 0 mask ensures
697 * the compiler will optimise away reference to them.
699 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
700 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
701 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
702 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
704 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
705 #ifdef NODE_NOT_IN_PAGE_FLAGS
706 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
707 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
708 SECTIONS_PGOFF : ZONES_PGOFF)
710 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
711 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
712 NODES_PGOFF : ZONES_PGOFF)
715 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
717 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
718 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
721 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
722 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
723 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
724 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
725 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
727 static inline enum zone_type page_zonenum(const struct page *page)
729 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
732 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
733 #define SECTION_IN_PAGE_FLAGS
737 * The identification function is mainly used by the buddy allocator for
738 * determining if two pages could be buddies. We are not really identifying
739 * the zone since we could be using the section number id if we do not have
740 * node id available in page flags.
741 * We only guarantee that it will return the same value for two combinable
744 static inline int page_zone_id(struct page *page)
746 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
749 static inline int zone_to_nid(struct zone *zone)
758 #ifdef NODE_NOT_IN_PAGE_FLAGS
759 extern int page_to_nid(const struct page *page);
761 static inline int page_to_nid(const struct page *page)
763 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
767 #ifdef CONFIG_NUMA_BALANCING
768 static inline int cpu_pid_to_cpupid(int cpu, int pid)
770 return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
773 static inline int cpupid_to_pid(int cpupid)
775 return cpupid & LAST__PID_MASK;
778 static inline int cpupid_to_cpu(int cpupid)
780 return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
783 static inline int cpupid_to_nid(int cpupid)
785 return cpu_to_node(cpupid_to_cpu(cpupid));
788 static inline bool cpupid_pid_unset(int cpupid)
790 return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
793 static inline bool cpupid_cpu_unset(int cpupid)
795 return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
798 static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
800 return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
803 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
804 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
805 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
807 return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
810 static inline int page_cpupid_last(struct page *page)
812 return page->_last_cpupid;
814 static inline void page_cpupid_reset_last(struct page *page)
816 page->_last_cpupid = -1 & LAST_CPUPID_MASK;
819 static inline int page_cpupid_last(struct page *page)
821 return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
824 extern int page_cpupid_xchg_last(struct page *page, int cpupid);
826 static inline void page_cpupid_reset_last(struct page *page)
828 int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
830 page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
831 page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
833 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
834 #else /* !CONFIG_NUMA_BALANCING */
835 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
837 return page_to_nid(page); /* XXX */
840 static inline int page_cpupid_last(struct page *page)
842 return page_to_nid(page); /* XXX */
845 static inline int cpupid_to_nid(int cpupid)
850 static inline int cpupid_to_pid(int cpupid)
855 static inline int cpupid_to_cpu(int cpupid)
860 static inline int cpu_pid_to_cpupid(int nid, int pid)
865 static inline bool cpupid_pid_unset(int cpupid)
870 static inline void page_cpupid_reset_last(struct page *page)
874 static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
878 #endif /* CONFIG_NUMA_BALANCING */
880 static inline struct zone *page_zone(const struct page *page)
882 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
885 #ifdef SECTION_IN_PAGE_FLAGS
886 static inline void set_page_section(struct page *page, unsigned long section)
888 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
889 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
892 static inline unsigned long page_to_section(const struct page *page)
894 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
898 static inline void set_page_zone(struct page *page, enum zone_type zone)
900 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
901 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
904 static inline void set_page_node(struct page *page, unsigned long node)
906 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
907 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
910 static inline void set_page_links(struct page *page, enum zone_type zone,
911 unsigned long node, unsigned long pfn)
913 set_page_zone(page, zone);
914 set_page_node(page, node);
915 #ifdef SECTION_IN_PAGE_FLAGS
916 set_page_section(page, pfn_to_section_nr(pfn));
921 * Some inline functions in vmstat.h depend on page_zone()
923 #include <linux/vmstat.h>
925 static __always_inline void *lowmem_page_address(const struct page *page)
927 return __va(PFN_PHYS(page_to_pfn(page)));
930 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
931 #define HASHED_PAGE_VIRTUAL
934 #if defined(WANT_PAGE_VIRTUAL)
935 static inline void *page_address(const struct page *page)
937 return page->virtual;
939 static inline void set_page_address(struct page *page, void *address)
941 page->virtual = address;
943 #define page_address_init() do { } while(0)
946 #if defined(HASHED_PAGE_VIRTUAL)
947 void *page_address(const struct page *page);
948 void set_page_address(struct page *page, void *virtual);
949 void page_address_init(void);
952 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
953 #define page_address(page) lowmem_page_address(page)
954 #define set_page_address(page, address) do { } while(0)
955 #define page_address_init() do { } while(0)
959 * On an anonymous page mapped into a user virtual memory area,
960 * page->mapping points to its anon_vma, not to a struct address_space;
961 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
963 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
964 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
965 * and then page->mapping points, not to an anon_vma, but to a private
966 * structure which KSM associates with that merged page. See ksm.h.
968 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
970 * Please note that, confusingly, "page_mapping" refers to the inode
971 * address_space which maps the page from disk; whereas "page_mapped"
972 * refers to user virtual address space into which the page is mapped.
974 #define PAGE_MAPPING_ANON 1
975 #define PAGE_MAPPING_KSM 2
976 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
978 extern struct address_space *page_mapping(struct page *page);
980 /* Neutral page->mapping pointer to address_space or anon_vma or other */
981 static inline void *page_rmapping(struct page *page)
983 return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
986 extern struct address_space *__page_file_mapping(struct page *);
989 struct address_space *page_file_mapping(struct page *page)
991 if (unlikely(PageSwapCache(page)))
992 return __page_file_mapping(page);
994 return page->mapping;
997 static inline int PageAnon(struct page *page)
999 return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
1003 * Return the pagecache index of the passed page. Regular pagecache pages
1004 * use ->index whereas swapcache pages use ->private
1006 static inline pgoff_t page_index(struct page *page)
1008 if (unlikely(PageSwapCache(page)))
1009 return page_private(page);
1013 extern pgoff_t __page_file_index(struct page *page);
1016 * Return the file index of the page. Regular pagecache pages use ->index
1017 * whereas swapcache pages use swp_offset(->private)
1019 static inline pgoff_t page_file_index(struct page *page)
1021 if (unlikely(PageSwapCache(page)))
1022 return __page_file_index(page);
1028 * Return true if this page is mapped into pagetables.
1030 static inline int page_mapped(struct page *page)
1032 return atomic_read(&(page)->_mapcount) >= 0;
1036 * Different kinds of faults, as returned by handle_mm_fault().
1037 * Used to decide whether a process gets delivered SIGBUS or
1038 * just gets major/minor fault counters bumped up.
1041 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1043 #define VM_FAULT_OOM 0x0001
1044 #define VM_FAULT_SIGBUS 0x0002
1045 #define VM_FAULT_MAJOR 0x0004
1046 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1047 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1048 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1049 #define VM_FAULT_SIGSEGV 0x0040
1051 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1052 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1053 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1054 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1056 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1058 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1059 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1062 /* Encode hstate index for a hwpoisoned large page */
1063 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1064 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1067 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1069 extern void pagefault_out_of_memory(void);
1071 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1074 * Flags passed to show_mem() and show_free_areas() to suppress output in
1077 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1079 extern void show_free_areas(unsigned int flags);
1080 extern bool skip_free_areas_node(unsigned int flags, int nid);
1082 int shmem_zero_setup(struct vm_area_struct *);
1084 bool shmem_mapping(struct address_space *mapping);
1086 static inline bool shmem_mapping(struct address_space *mapping)
1092 extern int can_do_mlock(void);
1093 extern int user_shm_lock(size_t, struct user_struct *);
1094 extern void user_shm_unlock(size_t, struct user_struct *);
1097 * Parameter block passed down to zap_pte_range in exceptional cases.
1099 struct zap_details {
1100 struct address_space *check_mapping; /* Check page->mapping if set */
1101 pgoff_t first_index; /* Lowest page->index to unmap */
1102 pgoff_t last_index; /* Highest page->index to unmap */
1105 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
1108 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1109 unsigned long size);
1110 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
1111 unsigned long size, struct zap_details *);
1112 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
1113 unsigned long start, unsigned long end);
1116 * mm_walk - callbacks for walk_page_range
1117 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1118 * this handler is required to be able to handle
1119 * pmd_trans_huge() pmds. They may simply choose to
1120 * split_huge_page() instead of handling it explicitly.
1121 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1122 * @pte_hole: if set, called for each hole at all levels
1123 * @hugetlb_entry: if set, called for each hugetlb entry
1124 * @test_walk: caller specific callback function to determine whether
1125 * we walk over the current vma or not. A positive returned
1126 * value means "do page table walk over the current vma,"
1127 * and a negative one means "abort current page table walk
1128 * right now." 0 means "skip the current vma."
1129 * @mm: mm_struct representing the target process of page table walk
1130 * @vma: vma currently walked (NULL if walking outside vmas)
1131 * @private: private data for callbacks' usage
1133 * (see the comment on walk_page_range() for more details)
1136 int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1137 unsigned long next, struct mm_walk *walk);
1138 int (*pte_entry)(pte_t *pte, unsigned long addr,
1139 unsigned long next, struct mm_walk *walk);
1140 int (*pte_hole)(unsigned long addr, unsigned long next,
1141 struct mm_walk *walk);
1142 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1143 unsigned long addr, unsigned long next,
1144 struct mm_walk *walk);
1145 int (*test_walk)(unsigned long addr, unsigned long next,
1146 struct mm_walk *walk);
1147 struct mm_struct *mm;
1148 struct vm_area_struct *vma;
1152 int walk_page_range(unsigned long addr, unsigned long end,
1153 struct mm_walk *walk);
1154 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1155 unsigned long end, unsigned long floor, unsigned long ceiling);
1156 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1157 struct vm_area_struct *vma);
1158 void unmap_mapping_range(struct address_space *mapping,
1159 loff_t const holebegin, loff_t const holelen, int even_cows);
1160 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1161 unsigned long *pfn);
1162 int follow_phys(struct vm_area_struct *vma, unsigned long address,
1163 unsigned int flags, unsigned long *prot, resource_size_t *phys);
1164 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1165 void *buf, int len, int write);
1167 static inline void unmap_shared_mapping_range(struct address_space *mapping,
1168 loff_t const holebegin, loff_t const holelen)
1170 unmap_mapping_range(mapping, holebegin, holelen, 0);
1173 extern void truncate_pagecache(struct inode *inode, loff_t new);
1174 extern void truncate_setsize(struct inode *inode, loff_t newsize);
1175 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
1176 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1177 int truncate_inode_page(struct address_space *mapping, struct page *page);
1178 int generic_error_remove_page(struct address_space *mapping, struct page *page);
1179 int invalidate_inode_page(struct page *page);
1182 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
1183 unsigned long address, unsigned int flags);
1184 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1185 unsigned long address, unsigned int fault_flags);
1187 static inline int handle_mm_fault(struct mm_struct *mm,
1188 struct vm_area_struct *vma, unsigned long address,
1191 /* should never happen if there's no MMU */
1193 return VM_FAULT_SIGBUS;
1195 static inline int fixup_user_fault(struct task_struct *tsk,
1196 struct mm_struct *mm, unsigned long address,
1197 unsigned int fault_flags)
1199 /* should never happen if there's no MMU */
1205 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
1206 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1207 void *buf, int len, int write);
1208 extern int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
1209 unsigned long addr, void *buf, int len, int write);
1211 long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1212 unsigned long start, unsigned long nr_pages,
1213 unsigned int foll_flags, struct page **pages,
1214 struct vm_area_struct **vmas, int *nonblocking);
1215 long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1216 unsigned long start, unsigned long nr_pages,
1217 int write, int force, struct page **pages,
1218 struct vm_area_struct **vmas);
1219 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1220 struct page **pages);
1222 int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1223 struct page **pages);
1224 int get_kernel_page(unsigned long start, int write, struct page **pages);
1225 struct page *get_dump_page(unsigned long addr);
1227 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1228 extern void do_invalidatepage(struct page *page, unsigned int offset,
1229 unsigned int length);
1231 int __set_page_dirty_nobuffers(struct page *page);
1232 int __set_page_dirty_no_writeback(struct page *page);
1233 int redirty_page_for_writepage(struct writeback_control *wbc,
1235 void account_page_dirtied(struct page *page, struct address_space *mapping);
1236 void account_page_writeback(struct page *page);
1237 int set_page_dirty(struct page *page);
1238 int set_page_dirty_lock(struct page *page);
1239 int clear_page_dirty_for_io(struct page *page);
1240 int get_cmdline(struct task_struct *task, char *buffer, int buflen);
1242 int vma_is_stack_for_task(struct vm_area_struct *vma, struct task_struct *t);
1244 static inline bool vma_is_anonymous(struct vm_area_struct *vma)
1246 return !vma->vm_ops;
1249 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1250 unsigned long old_addr, struct vm_area_struct *new_vma,
1251 unsigned long new_addr, unsigned long len,
1252 bool need_rmap_locks);
1253 extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1254 unsigned long end, pgprot_t newprot,
1255 int dirty_accountable, int prot_numa);
1256 extern int mprotect_fixup(struct vm_area_struct *vma,
1257 struct vm_area_struct **pprev, unsigned long start,
1258 unsigned long end, unsigned long newflags);
1261 * doesn't attempt to fault and will return short.
1263 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1264 struct page **pages);
1266 * per-process(per-mm_struct) statistics.
1268 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1270 long val = atomic_long_read(&mm->rss_stat.count[member]);
1272 #ifdef SPLIT_RSS_COUNTING
1274 * counter is updated in asynchronous manner and may go to minus.
1275 * But it's never be expected number for users.
1280 return (unsigned long)val;
1283 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1285 atomic_long_add(value, &mm->rss_stat.count[member]);
1288 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1290 atomic_long_inc(&mm->rss_stat.count[member]);
1293 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1295 atomic_long_dec(&mm->rss_stat.count[member]);
1298 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1300 return get_mm_counter(mm, MM_FILEPAGES) +
1301 get_mm_counter(mm, MM_ANONPAGES);
1304 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1306 return max(mm->hiwater_rss, get_mm_rss(mm));
1309 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1311 return max(mm->hiwater_vm, mm->total_vm);
1314 static inline void update_hiwater_rss(struct mm_struct *mm)
1316 unsigned long _rss = get_mm_rss(mm);
1318 if ((mm)->hiwater_rss < _rss)
1319 (mm)->hiwater_rss = _rss;
1322 static inline void update_hiwater_vm(struct mm_struct *mm)
1324 if (mm->hiwater_vm < mm->total_vm)
1325 mm->hiwater_vm = mm->total_vm;
1328 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1329 struct mm_struct *mm)
1331 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1333 if (*maxrss < hiwater_rss)
1334 *maxrss = hiwater_rss;
1337 #if defined(SPLIT_RSS_COUNTING)
1338 void sync_mm_rss(struct mm_struct *mm);
1340 static inline void sync_mm_rss(struct mm_struct *mm)
1345 int vma_wants_writenotify(struct vm_area_struct *vma);
1347 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1349 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1353 __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1357 #ifdef __PAGETABLE_PUD_FOLDED
1358 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1359 unsigned long address)
1364 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1367 #ifdef __PAGETABLE_PMD_FOLDED
1368 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1369 unsigned long address)
1374 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1377 int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1378 pmd_t *pmd, unsigned long address);
1379 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1382 * The following ifdef needed to get the 4level-fixup.h header to work.
1383 * Remove it when 4level-fixup.h has been removed.
1385 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1386 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1388 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1389 NULL: pud_offset(pgd, address);
1392 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1394 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1395 NULL: pmd_offset(pud, address);
1397 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1399 #if USE_SPLIT_PTE_PTLOCKS
1400 #if ALLOC_SPLIT_PTLOCKS
1401 void __init ptlock_cache_init(void);
1402 extern bool ptlock_alloc(struct page *page);
1403 extern void ptlock_free(struct page *page);
1405 static inline spinlock_t *ptlock_ptr(struct page *page)
1409 #else /* ALLOC_SPLIT_PTLOCKS */
1410 static inline void ptlock_cache_init(void)
1414 static inline bool ptlock_alloc(struct page *page)
1419 static inline void ptlock_free(struct page *page)
1423 static inline spinlock_t *ptlock_ptr(struct page *page)
1427 #endif /* ALLOC_SPLIT_PTLOCKS */
1429 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1431 return ptlock_ptr(pmd_page(*pmd));
1434 static inline bool ptlock_init(struct page *page)
1437 * prep_new_page() initialize page->private (and therefore page->ptl)
1438 * with 0. Make sure nobody took it in use in between.
1440 * It can happen if arch try to use slab for page table allocation:
1441 * slab code uses page->slab_cache and page->first_page (for tail
1442 * pages), which share storage with page->ptl.
1444 VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
1445 if (!ptlock_alloc(page))
1447 spin_lock_init(ptlock_ptr(page));
1451 /* Reset page->mapping so free_pages_check won't complain. */
1452 static inline void pte_lock_deinit(struct page *page)
1454 page->mapping = NULL;
1458 #else /* !USE_SPLIT_PTE_PTLOCKS */
1460 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1462 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1464 return &mm->page_table_lock;
1466 static inline void ptlock_cache_init(void) {}
1467 static inline bool ptlock_init(struct page *page) { return true; }
1468 static inline void pte_lock_deinit(struct page *page) {}
1469 #endif /* USE_SPLIT_PTE_PTLOCKS */
1471 static inline void pgtable_init(void)
1473 ptlock_cache_init();
1474 pgtable_cache_init();
1477 static inline bool pgtable_page_ctor(struct page *page)
1479 inc_zone_page_state(page, NR_PAGETABLE);
1480 return ptlock_init(page);
1483 static inline void pgtable_page_dtor(struct page *page)
1485 pte_lock_deinit(page);
1486 dec_zone_page_state(page, NR_PAGETABLE);
1489 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1491 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1492 pte_t *__pte = pte_offset_map(pmd, address); \
1498 #define pte_unmap_unlock(pte, ptl) do { \
1503 #define pte_alloc_map(mm, vma, pmd, address) \
1504 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1506 NULL: pte_offset_map(pmd, address))
1508 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1509 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1511 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1513 #define pte_alloc_kernel(pmd, address) \
1514 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1515 NULL: pte_offset_kernel(pmd, address))
1517 #if USE_SPLIT_PMD_PTLOCKS
1519 static struct page *pmd_to_page(pmd_t *pmd)
1521 unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
1522 return virt_to_page((void *)((unsigned long) pmd & mask));
1525 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1527 return ptlock_ptr(pmd_to_page(pmd));
1530 static inline bool pgtable_pmd_page_ctor(struct page *page)
1532 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1533 page->pmd_huge_pte = NULL;
1535 return ptlock_init(page);
1538 static inline void pgtable_pmd_page_dtor(struct page *page)
1540 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1541 VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
1546 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1550 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1552 return &mm->page_table_lock;
1555 static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
1556 static inline void pgtable_pmd_page_dtor(struct page *page) {}
1558 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1562 static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
1564 spinlock_t *ptl = pmd_lockptr(mm, pmd);
1569 extern void free_area_init(unsigned long * zones_size);
1570 extern void free_area_init_node(int nid, unsigned long * zones_size,
1571 unsigned long zone_start_pfn, unsigned long *zholes_size);
1572 extern void free_initmem(void);
1575 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1576 * into the buddy system. The freed pages will be poisoned with pattern
1577 * "poison" if it's within range [0, UCHAR_MAX].
1578 * Return pages freed into the buddy system.
1580 extern unsigned long free_reserved_area(void *start, void *end,
1581 int poison, char *s);
1583 #ifdef CONFIG_HIGHMEM
1585 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1586 * and totalram_pages.
1588 extern void free_highmem_page(struct page *page);
1591 extern void adjust_managed_page_count(struct page *page, long count);
1592 extern void mem_init_print_info(const char *str);
1594 /* Free the reserved page into the buddy system, so it gets managed. */
1595 static inline void __free_reserved_page(struct page *page)
1597 ClearPageReserved(page);
1598 init_page_count(page);
1602 static inline void free_reserved_page(struct page *page)
1604 __free_reserved_page(page);
1605 adjust_managed_page_count(page, 1);
1608 static inline void mark_page_reserved(struct page *page)
1610 SetPageReserved(page);
1611 adjust_managed_page_count(page, -1);
1615 * Default method to free all the __init memory into the buddy system.
1616 * The freed pages will be poisoned with pattern "poison" if it's within
1617 * range [0, UCHAR_MAX].
1618 * Return pages freed into the buddy system.
1620 static inline unsigned long free_initmem_default(int poison)
1622 extern char __init_begin[], __init_end[];
1624 return free_reserved_area(&__init_begin, &__init_end,
1625 poison, "unused kernel");
1628 static inline unsigned long get_num_physpages(void)
1631 unsigned long phys_pages = 0;
1633 for_each_online_node(nid)
1634 phys_pages += node_present_pages(nid);
1639 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1641 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1642 * zones, allocate the backing mem_map and account for memory holes in a more
1643 * architecture independent manner. This is a substitute for creating the
1644 * zone_sizes[] and zholes_size[] arrays and passing them to
1645 * free_area_init_node()
1647 * An architecture is expected to register range of page frames backed by
1648 * physical memory with memblock_add[_node]() before calling
1649 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1650 * usage, an architecture is expected to do something like
1652 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1654 * for_each_valid_physical_page_range()
1655 * memblock_add_node(base, size, nid)
1656 * free_area_init_nodes(max_zone_pfns);
1658 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1659 * registered physical page range. Similarly
1660 * sparse_memory_present_with_active_regions() calls memory_present() for
1661 * each range when SPARSEMEM is enabled.
1663 * See mm/page_alloc.c for more information on each function exposed by
1664 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1666 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1667 unsigned long node_map_pfn_alignment(void);
1668 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1669 unsigned long end_pfn);
1670 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1671 unsigned long end_pfn);
1672 extern void get_pfn_range_for_nid(unsigned int nid,
1673 unsigned long *start_pfn, unsigned long *end_pfn);
1674 extern unsigned long find_min_pfn_with_active_regions(void);
1675 extern void free_bootmem_with_active_regions(int nid,
1676 unsigned long max_low_pfn);
1677 extern void sparse_memory_present_with_active_regions(int nid);
1679 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1681 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1682 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1683 static inline int __early_pfn_to_nid(unsigned long pfn)
1688 /* please see mm/page_alloc.c */
1689 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1690 /* there is a per-arch backend function. */
1691 extern int __meminit __early_pfn_to_nid(unsigned long pfn);
1694 extern void set_dma_reserve(unsigned long new_dma_reserve);
1695 extern void memmap_init_zone(unsigned long, int, unsigned long,
1696 unsigned long, enum memmap_context);
1697 extern void setup_per_zone_wmarks(void);
1698 extern int __meminit init_per_zone_wmark_min(void);
1699 extern void mem_init(void);
1700 extern void __init mmap_init(void);
1701 extern void show_mem(unsigned int flags);
1702 extern long si_mem_available(void);
1703 extern void si_meminfo(struct sysinfo * val);
1704 extern void si_meminfo_node(struct sysinfo *val, int nid);
1706 extern __printf(3, 4)
1707 void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
1709 extern void setup_per_cpu_pageset(void);
1711 extern void zone_pcp_update(struct zone *zone);
1712 extern void zone_pcp_reset(struct zone *zone);
1715 extern int min_free_kbytes;
1718 extern atomic_long_t mmap_pages_allocated;
1719 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1721 /* interval_tree.c */
1722 void vma_interval_tree_insert(struct vm_area_struct *node,
1723 struct rb_root *root);
1724 void vma_interval_tree_insert_after(struct vm_area_struct *node,
1725 struct vm_area_struct *prev,
1726 struct rb_root *root);
1727 void vma_interval_tree_remove(struct vm_area_struct *node,
1728 struct rb_root *root);
1729 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1730 unsigned long start, unsigned long last);
1731 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1732 unsigned long start, unsigned long last);
1734 #define vma_interval_tree_foreach(vma, root, start, last) \
1735 for (vma = vma_interval_tree_iter_first(root, start, last); \
1736 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1738 void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1739 struct rb_root *root);
1740 void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1741 struct rb_root *root);
1742 struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1743 struct rb_root *root, unsigned long start, unsigned long last);
1744 struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1745 struct anon_vma_chain *node, unsigned long start, unsigned long last);
1746 #ifdef CONFIG_DEBUG_VM_RB
1747 void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1750 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1751 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1752 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1755 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1756 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1757 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1758 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1759 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1760 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1761 struct mempolicy *);
1762 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1763 extern int split_vma(struct mm_struct *,
1764 struct vm_area_struct *, unsigned long addr, int new_below);
1765 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1766 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1767 struct rb_node **, struct rb_node *);
1768 extern void unlink_file_vma(struct vm_area_struct *);
1769 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1770 unsigned long addr, unsigned long len, pgoff_t pgoff,
1771 bool *need_rmap_locks);
1772 extern void exit_mmap(struct mm_struct *);
1774 extern int mm_take_all_locks(struct mm_struct *mm);
1775 extern void mm_drop_all_locks(struct mm_struct *mm);
1777 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1778 extern struct file *get_mm_exe_file(struct mm_struct *mm);
1780 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1781 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
1782 unsigned long addr, unsigned long len,
1783 unsigned long flags,
1784 const struct vm_special_mapping *spec);
1785 /* This is an obsolete alternative to _install_special_mapping. */
1786 extern int install_special_mapping(struct mm_struct *mm,
1787 unsigned long addr, unsigned long len,
1788 unsigned long flags, struct page **pages);
1790 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1792 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1793 unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
1794 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1795 unsigned long len, unsigned long prot, unsigned long flags,
1796 unsigned long pgoff, unsigned long *populate);
1797 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1800 extern int __mm_populate(unsigned long addr, unsigned long len,
1802 static inline void mm_populate(unsigned long addr, unsigned long len)
1805 (void) __mm_populate(addr, len, 1);
1808 static inline void mm_populate(unsigned long addr, unsigned long len) {}
1811 /* These take the mm semaphore themselves */
1812 extern unsigned long vm_brk(unsigned long, unsigned long);
1813 extern int vm_munmap(unsigned long, size_t);
1814 extern unsigned long vm_mmap(struct file *, unsigned long,
1815 unsigned long, unsigned long,
1816 unsigned long, unsigned long);
1818 struct vm_unmapped_area_info {
1819 #define VM_UNMAPPED_AREA_TOPDOWN 1
1820 unsigned long flags;
1821 unsigned long length;
1822 unsigned long low_limit;
1823 unsigned long high_limit;
1824 unsigned long align_mask;
1825 unsigned long align_offset;
1828 extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
1829 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
1832 * Search for an unmapped address range.
1834 * We are looking for a range that:
1835 * - does not intersect with any VMA;
1836 * - is contained within the [low_limit, high_limit) interval;
1837 * - is at least the desired size.
1838 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1840 static inline unsigned long
1841 vm_unmapped_area(struct vm_unmapped_area_info *info)
1843 if (!(info->flags & VM_UNMAPPED_AREA_TOPDOWN))
1844 return unmapped_area(info);
1846 return unmapped_area_topdown(info);
1850 extern void truncate_inode_pages(struct address_space *, loff_t);
1851 extern void truncate_inode_pages_range(struct address_space *,
1852 loff_t lstart, loff_t lend);
1853 extern void truncate_inode_pages_final(struct address_space *);
1855 /* generic vm_area_ops exported for stackable file systems */
1856 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1857 extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
1858 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1860 /* mm/page-writeback.c */
1861 int write_one_page(struct page *page, int wait);
1862 void task_dirty_inc(struct task_struct *tsk);
1865 #define VM_MAX_READAHEAD 128 /* kbytes */
1866 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1868 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1869 pgoff_t offset, unsigned long nr_to_read);
1871 void page_cache_sync_readahead(struct address_space *mapping,
1872 struct file_ra_state *ra,
1875 unsigned long size);
1877 void page_cache_async_readahead(struct address_space *mapping,
1878 struct file_ra_state *ra,
1882 unsigned long size);
1884 unsigned long max_sane_readahead(unsigned long nr);
1886 extern unsigned long stack_guard_gap;
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) (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 vm_start_gap(struct vm_area_struct *vma)
1917 unsigned long vm_start = vma->vm_start;
1919 if (vma->vm_flags & VM_GROWSDOWN) {
1920 vm_start -= stack_guard_gap;
1921 if (vm_start > vma->vm_start)
1927 static inline unsigned long vm_end_gap(struct vm_area_struct *vma)
1929 unsigned long vm_end = vma->vm_end;
1931 if (vma->vm_flags & VM_GROWSUP) {
1932 vm_end += stack_guard_gap;
1933 if (vm_end < vma->vm_end)
1934 vm_end = -PAGE_SIZE;
1939 static inline unsigned long vma_pages(struct vm_area_struct *vma)
1941 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
1944 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1945 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
1946 unsigned long vm_start, unsigned long vm_end)
1948 struct vm_area_struct *vma = find_vma(mm, vm_start);
1950 if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
1956 static inline bool range_in_vma(struct vm_area_struct *vma,
1957 unsigned long start, unsigned long end)
1959 return (vma && vma->vm_start <= start && end <= vma->vm_end);
1963 pgprot_t vm_get_page_prot(unsigned long vm_flags);
1965 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
1971 #ifdef CONFIG_NUMA_BALANCING
1972 unsigned long change_prot_numa(struct vm_area_struct *vma,
1973 unsigned long start, unsigned long end);
1976 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
1977 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
1978 unsigned long pfn, unsigned long size, pgprot_t);
1979 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
1980 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
1982 int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
1983 unsigned long pfn, pgprot_t pgprot);
1984 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
1986 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
1989 struct page *follow_page_mask(struct vm_area_struct *vma,
1990 unsigned long address, unsigned int foll_flags,
1991 unsigned int *page_mask);
1993 static inline struct page *follow_page(struct vm_area_struct *vma,
1994 unsigned long address, unsigned int foll_flags)
1996 unsigned int unused_page_mask;
1997 return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
2000 #define FOLL_WRITE 0x01 /* check pte is writable */
2001 #define FOLL_TOUCH 0x02 /* mark page accessed */
2002 #define FOLL_GET 0x04 /* do get_page on page */
2003 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2004 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2005 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2006 * and return without waiting upon it */
2007 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
2008 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2009 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2010 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2011 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2012 #define FOLL_COW 0x4000 /* internal GUP flag */
2014 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
2016 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
2017 unsigned long size, pte_fn_t fn, void *data);
2019 #ifdef CONFIG_PROC_FS
2020 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
2022 static inline void vm_stat_account(struct mm_struct *mm,
2023 unsigned long flags, struct file *file, long pages)
2025 mm->total_vm += pages;
2027 #endif /* CONFIG_PROC_FS */
2029 #ifdef CONFIG_DEBUG_PAGEALLOC
2030 extern void kernel_map_pages(struct page *page, int numpages, int enable);
2031 #ifdef CONFIG_HIBERNATION
2032 extern bool kernel_page_present(struct page *page);
2033 #endif /* CONFIG_HIBERNATION */
2036 kernel_map_pages(struct page *page, int numpages, int enable) {}
2037 #ifdef CONFIG_HIBERNATION
2038 static inline bool kernel_page_present(struct page *page) { return true; }
2039 #endif /* CONFIG_HIBERNATION */
2042 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
2043 #ifdef __HAVE_ARCH_GATE_AREA
2044 int in_gate_area_no_mm(unsigned long addr);
2045 int in_gate_area(struct mm_struct *mm, unsigned long addr);
2047 int in_gate_area_no_mm(unsigned long addr);
2048 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
2049 #endif /* __HAVE_ARCH_GATE_AREA */
2051 #ifdef CONFIG_SYSCTL
2052 extern int sysctl_drop_caches;
2053 int drop_caches_sysctl_handler(struct ctl_table *, int,
2054 void __user *, size_t *, loff_t *);
2057 unsigned long shrink_slab(struct shrink_control *shrink,
2058 unsigned long nr_pages_scanned,
2059 unsigned long lru_pages);
2062 #define randomize_va_space 0
2064 extern int randomize_va_space;
2067 const char * arch_vma_name(struct vm_area_struct *vma);
2068 void print_vma_addr(char *prefix, unsigned long rip);
2070 void sparse_mem_maps_populate_node(struct page **map_map,
2071 unsigned long pnum_begin,
2072 unsigned long pnum_end,
2073 unsigned long map_count,
2076 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
2077 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
2078 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
2079 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
2080 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
2081 void *vmemmap_alloc_block(unsigned long size, int node);
2082 void *vmemmap_alloc_block_buf(unsigned long size, int node);
2083 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
2084 int vmemmap_populate_basepages(unsigned long start, unsigned long end,
2086 int vmemmap_populate(unsigned long start, unsigned long end, int node);
2087 void vmemmap_populate_print_last(void);
2088 #ifdef CONFIG_MEMORY_HOTPLUG
2089 void vmemmap_free(unsigned long start, unsigned long end);
2091 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
2092 unsigned long size);
2095 MF_COUNT_INCREASED = 1 << 0,
2096 MF_ACTION_REQUIRED = 1 << 1,
2097 MF_MUST_KILL = 1 << 2,
2098 MF_SOFT_OFFLINE = 1 << 3,
2100 extern int memory_failure(unsigned long pfn, int trapno, int flags);
2101 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
2102 extern int unpoison_memory(unsigned long pfn);
2103 extern int sysctl_memory_failure_early_kill;
2104 extern int sysctl_memory_failure_recovery;
2105 extern void shake_page(struct page *p, int access);
2106 extern atomic_long_t num_poisoned_pages;
2107 extern int soft_offline_page(struct page *page, int flags);
2109 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2110 extern void clear_huge_page(struct page *page,
2112 unsigned int pages_per_huge_page);
2113 extern void copy_user_huge_page(struct page *dst, struct page *src,
2114 unsigned long addr, struct vm_area_struct *vma,
2115 unsigned int pages_per_huge_page);
2116 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2118 #ifdef CONFIG_DEBUG_PAGEALLOC
2119 extern unsigned int _debug_guardpage_minorder;
2121 static inline unsigned int debug_guardpage_minorder(void)
2123 return _debug_guardpage_minorder;
2126 static inline bool page_is_guard(struct page *page)
2128 return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags);
2131 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2132 static inline bool page_is_guard(struct page *page) { return false; }
2133 #endif /* CONFIG_DEBUG_PAGEALLOC */
2135 #if MAX_NUMNODES > 1
2136 void __init setup_nr_node_ids(void);
2138 static inline void setup_nr_node_ids(void) {}
2141 #endif /* __KERNEL__ */
2142 #endif /* _LINUX_MM_H */