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>
21 #include <linux/resource.h>
22 #include <linux/page_ext.h>
26 struct anon_vma_chain;
29 struct writeback_control;
31 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
32 extern unsigned long max_mapnr;
34 static inline void set_max_mapnr(unsigned long limit)
39 static inline void set_max_mapnr(unsigned long limit) { }
42 extern unsigned long totalram_pages;
43 extern void * high_memory;
44 extern int page_cluster;
47 extern int sysctl_legacy_va_layout;
49 #define sysctl_legacy_va_layout 0
53 #include <asm/pgtable.h>
54 #include <asm/processor.h>
57 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
61 * To prevent common memory management code establishing
62 * a zero page mapping on a read fault.
63 * This macro should be defined within <asm/pgtable.h>.
64 * s390 does this to prevent multiplexing of hardware bits
65 * related to the physical page in case of virtualization.
67 #ifndef mm_forbids_zeropage
68 #define mm_forbids_zeropage(X) (0)
71 extern unsigned long sysctl_user_reserve_kbytes;
72 extern unsigned long sysctl_admin_reserve_kbytes;
74 extern int sysctl_overcommit_memory;
75 extern int sysctl_overcommit_ratio;
76 extern unsigned long sysctl_overcommit_kbytes;
78 extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *,
80 extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
83 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
85 /* to align the pointer to the (next) page boundary */
86 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
88 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
89 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
92 * Linux kernel virtual memory manager primitives.
93 * The idea being to have a "virtual" mm in the same way
94 * we have a virtual fs - giving a cleaner interface to the
95 * mm details, and allowing different kinds of memory mappings
96 * (from shared memory to executable loading to arbitrary
100 extern struct kmem_cache *vm_area_cachep;
103 extern struct rb_root nommu_region_tree;
104 extern struct rw_semaphore nommu_region_sem;
106 extern unsigned int kobjsize(const void *objp);
110 * vm_flags in vm_area_struct, see mm_types.h.
112 #define VM_NONE 0x00000000
114 #define VM_READ 0x00000001 /* currently active flags */
115 #define VM_WRITE 0x00000002
116 #define VM_EXEC 0x00000004
117 #define VM_SHARED 0x00000008
119 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
120 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
121 #define VM_MAYWRITE 0x00000020
122 #define VM_MAYEXEC 0x00000040
123 #define VM_MAYSHARE 0x00000080
125 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
126 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
127 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
129 #define VM_LOCKED 0x00002000
130 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
132 /* Used by sys_madvise() */
133 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
134 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
136 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
137 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
138 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
139 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
140 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
141 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
142 #define VM_ARCH_2 0x02000000
143 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
145 #ifdef CONFIG_MEM_SOFT_DIRTY
146 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
148 # define VM_SOFTDIRTY 0
151 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
152 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
153 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
154 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
156 #if defined(CONFIG_X86)
157 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
158 #elif defined(CONFIG_PPC)
159 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
160 #elif defined(CONFIG_PARISC)
161 # define VM_GROWSUP VM_ARCH_1
162 #elif defined(CONFIG_METAG)
163 # define VM_GROWSUP VM_ARCH_1
164 #elif defined(CONFIG_IA64)
165 # define VM_GROWSUP VM_ARCH_1
166 #elif !defined(CONFIG_MMU)
167 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
170 #if defined(CONFIG_X86)
171 /* MPX specific bounds table or bounds directory */
172 # define VM_MPX VM_ARCH_2
176 # define VM_GROWSUP VM_NONE
179 /* Bits set in the VMA until the stack is in its final location */
180 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
182 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
183 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
186 #ifdef CONFIG_STACK_GROWSUP
187 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
189 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
193 * Special vmas that are non-mergable, non-mlock()able.
194 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
196 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
198 /* This mask defines which mm->def_flags a process can inherit its parent */
199 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
202 * mapping from the currently active vm_flags protection bits (the
203 * low four bits) to a page protection mask..
205 extern pgprot_t protection_map[16];
207 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
208 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
209 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
210 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
211 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
212 #define FAULT_FLAG_TRIED 0x20 /* Second try */
213 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
216 * vm_fault is filled by the the pagefault handler and passed to the vma's
217 * ->fault function. The vma's ->fault is responsible for returning a bitmask
218 * of VM_FAULT_xxx flags that give details about how the fault was handled.
220 * pgoff should be used in favour of virtual_address, if possible.
223 unsigned int flags; /* FAULT_FLAG_xxx flags */
224 pgoff_t pgoff; /* Logical page offset based on vma */
225 void __user *virtual_address; /* Faulting virtual address */
227 struct page *page; /* ->fault handlers should return a
228 * page here, unless VM_FAULT_NOPAGE
229 * is set (which is also implied by
232 /* for ->map_pages() only */
233 pgoff_t max_pgoff; /* map pages for offset from pgoff till
234 * max_pgoff inclusive */
235 pte_t *pte; /* pte entry associated with ->pgoff */
239 * These are the virtual MM functions - opening of an area, closing and
240 * unmapping it (needed to keep files on disk up-to-date etc), pointer
241 * to the functions called when a no-page or a wp-page exception occurs.
243 struct vm_operations_struct {
244 void (*open)(struct vm_area_struct * area);
245 void (*close)(struct vm_area_struct * area);
246 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
247 void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
249 /* notification that a previously read-only page is about to become
250 * writable, if an error is returned it will cause a SIGBUS */
251 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
253 /* called by access_process_vm when get_user_pages() fails, typically
254 * for use by special VMAs that can switch between memory and hardware
256 int (*access)(struct vm_area_struct *vma, unsigned long addr,
257 void *buf, int len, int write);
259 /* Called by the /proc/PID/maps code to ask the vma whether it
260 * has a special name. Returning non-NULL will also cause this
261 * vma to be dumped unconditionally. */
262 const char *(*name)(struct vm_area_struct *vma);
266 * set_policy() op must add a reference to any non-NULL @new mempolicy
267 * to hold the policy upon return. Caller should pass NULL @new to
268 * remove a policy and fall back to surrounding context--i.e. do not
269 * install a MPOL_DEFAULT policy, nor the task or system default
272 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
275 * get_policy() op must add reference [mpol_get()] to any policy at
276 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
277 * in mm/mempolicy.c will do this automatically.
278 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
279 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
280 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
281 * must return NULL--i.e., do not "fallback" to task or system default
284 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
292 #define page_private(page) ((page)->private)
293 #define set_page_private(page, v) ((page)->private = (v))
295 /* It's valid only if the page is free path or free_list */
296 static inline void set_freepage_migratetype(struct page *page, int migratetype)
298 page->index = migratetype;
301 /* It's valid only if the page is free path or free_list */
302 static inline int get_freepage_migratetype(struct page *page)
308 * FIXME: take this include out, include page-flags.h in
309 * files which need it (119 of them)
311 #include <linux/page-flags.h>
312 #include <linux/huge_mm.h>
315 * Methods to modify the page usage count.
317 * What counts for a page usage:
318 * - cache mapping (page->mapping)
319 * - private data (page->private)
320 * - page mapped in a task's page tables, each mapping
321 * is counted separately
323 * Also, many kernel routines increase the page count before a critical
324 * routine so they can be sure the page doesn't go away from under them.
328 * Drop a ref, return true if the refcount fell to zero (the page has no users)
330 static inline int put_page_testzero(struct page *page)
332 VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page);
333 return atomic_dec_and_test(&page->_count);
337 * Try to grab a ref unless the page has a refcount of zero, return false if
339 * This can be called when MMU is off so it must not access
340 * any of the virtual mappings.
342 static inline int get_page_unless_zero(struct page *page)
344 return atomic_inc_not_zero(&page->_count);
348 * Try to drop a ref unless the page has a refcount of one, return false if
350 * This is to make sure that the refcount won't become zero after this drop.
351 * This can be called when MMU is off so it must not access
352 * any of the virtual mappings.
354 static inline int put_page_unless_one(struct page *page)
356 return atomic_add_unless(&page->_count, -1, 1);
359 extern int page_is_ram(unsigned long pfn);
360 extern int region_is_ram(resource_size_t phys_addr, unsigned long size);
362 /* Support for virtually mapped pages */
363 struct page *vmalloc_to_page(const void *addr);
364 unsigned long vmalloc_to_pfn(const void *addr);
367 * Determine if an address is within the vmalloc range
369 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
370 * is no special casing required.
372 static inline int is_vmalloc_addr(const void *x)
375 unsigned long addr = (unsigned long)x;
377 return addr >= VMALLOC_START && addr < VMALLOC_END;
383 extern int is_vmalloc_or_module_addr(const void *x);
385 static inline int is_vmalloc_or_module_addr(const void *x)
391 extern void kvfree(const void *addr);
393 static inline void compound_lock(struct page *page)
395 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
396 VM_BUG_ON_PAGE(PageSlab(page), page);
397 bit_spin_lock(PG_compound_lock, &page->flags);
401 static inline void compound_unlock(struct page *page)
403 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
404 VM_BUG_ON_PAGE(PageSlab(page), page);
405 bit_spin_unlock(PG_compound_lock, &page->flags);
409 static inline unsigned long compound_lock_irqsave(struct page *page)
411 unsigned long uninitialized_var(flags);
412 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
413 local_irq_save(flags);
419 static inline void compound_unlock_irqrestore(struct page *page,
422 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
423 compound_unlock(page);
424 local_irq_restore(flags);
428 static inline struct page *compound_head_by_tail(struct page *tail)
430 struct page *head = tail->first_page;
433 * page->first_page may be a dangling pointer to an old
434 * compound page, so recheck that it is still a tail
435 * page before returning.
438 if (likely(PageTail(tail)))
444 * Since either compound page could be dismantled asynchronously in THP
445 * or we access asynchronously arbitrary positioned struct page, there
446 * would be tail flag race. To handle this race, we should call
447 * smp_rmb() before checking tail flag. compound_head_by_tail() did it.
449 static inline struct page *compound_head(struct page *page)
451 if (unlikely(PageTail(page)))
452 return compound_head_by_tail(page);
457 * If we access compound page synchronously such as access to
458 * allocated page, there is no need to handle tail flag race, so we can
459 * check tail flag directly without any synchronization primitive.
461 static inline struct page *compound_head_fast(struct page *page)
463 if (unlikely(PageTail(page)))
464 return page->first_page;
469 * The atomic page->_mapcount, starts from -1: so that transitions
470 * both from it and to it can be tracked, using atomic_inc_and_test
471 * and atomic_add_negative(-1).
473 static inline void page_mapcount_reset(struct page *page)
475 atomic_set(&(page)->_mapcount, -1);
478 static inline int page_mapcount(struct page *page)
480 return atomic_read(&(page)->_mapcount) + 1;
483 static inline int page_count(struct page *page)
485 return atomic_read(&compound_head(page)->_count);
488 #ifdef CONFIG_HUGETLB_PAGE
489 extern int PageHeadHuge(struct page *page_head);
490 #else /* CONFIG_HUGETLB_PAGE */
491 static inline int PageHeadHuge(struct page *page_head)
495 #endif /* CONFIG_HUGETLB_PAGE */
497 static inline bool __compound_tail_refcounted(struct page *page)
499 return !PageSlab(page) && !PageHeadHuge(page);
503 * This takes a head page as parameter and tells if the
504 * tail page reference counting can be skipped.
506 * For this to be safe, PageSlab and PageHeadHuge must remain true on
507 * any given page where they return true here, until all tail pins
508 * have been released.
510 static inline bool compound_tail_refcounted(struct page *page)
512 VM_BUG_ON_PAGE(!PageHead(page), page);
513 return __compound_tail_refcounted(page);
516 static inline void get_huge_page_tail(struct page *page)
519 * __split_huge_page_refcount() cannot run from under us.
521 VM_BUG_ON_PAGE(!PageTail(page), page);
522 VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
523 VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page);
524 if (compound_tail_refcounted(page->first_page))
525 atomic_inc(&page->_mapcount);
528 extern bool __get_page_tail(struct page *page);
530 static inline void get_page(struct page *page)
532 if (unlikely(PageTail(page)))
533 if (likely(__get_page_tail(page)))
536 * Getting a normal page or the head of a compound page
537 * requires to already have an elevated page->_count.
539 VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
540 atomic_inc(&page->_count);
543 static inline struct page *virt_to_head_page(const void *x)
545 struct page *page = virt_to_page(x);
548 * We don't need to worry about synchronization of tail flag
549 * when we call virt_to_head_page() since it is only called for
550 * already allocated page and this page won't be freed until
551 * this virt_to_head_page() is finished. So use _fast variant.
553 return compound_head_fast(page);
557 * Setup the page count before being freed into the page allocator for
558 * the first time (boot or memory hotplug)
560 static inline void init_page_count(struct page *page)
562 atomic_set(&page->_count, 1);
566 * PageBuddy() indicate that the page is free and in the buddy system
567 * (see mm/page_alloc.c).
569 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
570 * -2 so that an underflow of the page_mapcount() won't be mistaken
571 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
572 * efficiently by most CPU architectures.
574 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
576 static inline int PageBuddy(struct page *page)
578 return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE;
581 static inline void __SetPageBuddy(struct page *page)
583 VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page);
584 atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE);
587 static inline void __ClearPageBuddy(struct page *page)
589 VM_BUG_ON_PAGE(!PageBuddy(page), page);
590 atomic_set(&page->_mapcount, -1);
593 #define PAGE_BALLOON_MAPCOUNT_VALUE (-256)
595 static inline int PageBalloon(struct page *page)
597 return atomic_read(&page->_mapcount) == PAGE_BALLOON_MAPCOUNT_VALUE;
600 static inline void __SetPageBalloon(struct page *page)
602 VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page);
603 atomic_set(&page->_mapcount, PAGE_BALLOON_MAPCOUNT_VALUE);
606 static inline void __ClearPageBalloon(struct page *page)
608 VM_BUG_ON_PAGE(!PageBalloon(page), page);
609 atomic_set(&page->_mapcount, -1);
612 void put_page(struct page *page);
613 void put_pages_list(struct list_head *pages);
615 void split_page(struct page *page, unsigned int order);
616 int split_free_page(struct page *page);
619 * Compound pages have a destructor function. Provide a
620 * prototype for that function and accessor functions.
621 * These are _only_ valid on the head of a PG_compound page.
623 typedef void compound_page_dtor(struct page *);
625 static inline void set_compound_page_dtor(struct page *page,
626 compound_page_dtor *dtor)
628 page[1].lru.next = (void *)dtor;
631 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
633 return (compound_page_dtor *)page[1].lru.next;
636 static inline int compound_order(struct page *page)
640 return (unsigned long)page[1].lru.prev;
643 static inline void set_compound_order(struct page *page, unsigned long order)
645 page[1].lru.prev = (void *)order;
650 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
651 * servicing faults for write access. In the normal case, do always want
652 * pte_mkwrite. But get_user_pages can cause write faults for mappings
653 * that do not have writing enabled, when used by access_process_vm.
655 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
657 if (likely(vma->vm_flags & VM_WRITE))
658 pte = pte_mkwrite(pte);
662 void do_set_pte(struct vm_area_struct *vma, unsigned long address,
663 struct page *page, pte_t *pte, bool write, bool anon);
667 * Multiple processes may "see" the same page. E.g. for untouched
668 * mappings of /dev/null, all processes see the same page full of
669 * zeroes, and text pages of executables and shared libraries have
670 * only one copy in memory, at most, normally.
672 * For the non-reserved pages, page_count(page) denotes a reference count.
673 * page_count() == 0 means the page is free. page->lru is then used for
674 * freelist management in the buddy allocator.
675 * page_count() > 0 means the page has been allocated.
677 * Pages are allocated by the slab allocator in order to provide memory
678 * to kmalloc and kmem_cache_alloc. In this case, the management of the
679 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
680 * unless a particular usage is carefully commented. (the responsibility of
681 * freeing the kmalloc memory is the caller's, of course).
683 * A page may be used by anyone else who does a __get_free_page().
684 * In this case, page_count still tracks the references, and should only
685 * be used through the normal accessor functions. The top bits of page->flags
686 * and page->virtual store page management information, but all other fields
687 * are unused and could be used privately, carefully. The management of this
688 * page is the responsibility of the one who allocated it, and those who have
689 * subsequently been given references to it.
691 * The other pages (we may call them "pagecache pages") are completely
692 * managed by the Linux memory manager: I/O, buffers, swapping etc.
693 * The following discussion applies only to them.
695 * A pagecache page contains an opaque `private' member, which belongs to the
696 * page's address_space. Usually, this is the address of a circular list of
697 * the page's disk buffers. PG_private must be set to tell the VM to call
698 * into the filesystem to release these pages.
700 * A page may belong to an inode's memory mapping. In this case, page->mapping
701 * is the pointer to the inode, and page->index is the file offset of the page,
702 * in units of PAGE_CACHE_SIZE.
704 * If pagecache pages are not associated with an inode, they are said to be
705 * anonymous pages. These may become associated with the swapcache, and in that
706 * case PG_swapcache is set, and page->private is an offset into the swapcache.
708 * In either case (swapcache or inode backed), the pagecache itself holds one
709 * reference to the page. Setting PG_private should also increment the
710 * refcount. The each user mapping also has a reference to the page.
712 * The pagecache pages are stored in a per-mapping radix tree, which is
713 * rooted at mapping->page_tree, and indexed by offset.
714 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
715 * lists, we instead now tag pages as dirty/writeback in the radix tree.
717 * All pagecache pages may be subject to I/O:
718 * - inode pages may need to be read from disk,
719 * - inode pages which have been modified and are MAP_SHARED may need
720 * to be written back to the inode on disk,
721 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
722 * modified may need to be swapped out to swap space and (later) to be read
727 * The zone field is never updated after free_area_init_core()
728 * sets it, so none of the operations on it need to be atomic.
731 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
732 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
733 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
734 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
735 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
738 * Define the bit shifts to access each section. For non-existent
739 * sections we define the shift as 0; that plus a 0 mask ensures
740 * the compiler will optimise away reference to them.
742 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
743 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
744 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
745 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
747 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
748 #ifdef NODE_NOT_IN_PAGE_FLAGS
749 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
750 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
751 SECTIONS_PGOFF : ZONES_PGOFF)
753 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
754 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
755 NODES_PGOFF : ZONES_PGOFF)
758 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
760 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
761 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
764 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
765 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
766 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
767 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
768 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
770 static inline enum zone_type page_zonenum(const struct page *page)
772 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
775 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
776 #define SECTION_IN_PAGE_FLAGS
780 * The identification function is mainly used by the buddy allocator for
781 * determining if two pages could be buddies. We are not really identifying
782 * the zone since we could be using the section number id if we do not have
783 * node id available in page flags.
784 * We only guarantee that it will return the same value for two combinable
787 static inline int page_zone_id(struct page *page)
789 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
792 static inline int zone_to_nid(struct zone *zone)
801 #ifdef NODE_NOT_IN_PAGE_FLAGS
802 extern int page_to_nid(const struct page *page);
804 static inline int page_to_nid(const struct page *page)
806 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
810 #ifdef CONFIG_NUMA_BALANCING
811 static inline int cpu_pid_to_cpupid(int cpu, int pid)
813 return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
816 static inline int cpupid_to_pid(int cpupid)
818 return cpupid & LAST__PID_MASK;
821 static inline int cpupid_to_cpu(int cpupid)
823 return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
826 static inline int cpupid_to_nid(int cpupid)
828 return cpu_to_node(cpupid_to_cpu(cpupid));
831 static inline bool cpupid_pid_unset(int cpupid)
833 return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
836 static inline bool cpupid_cpu_unset(int cpupid)
838 return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
841 static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
843 return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
846 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
847 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
848 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
850 return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
853 static inline int page_cpupid_last(struct page *page)
855 return page->_last_cpupid;
857 static inline void page_cpupid_reset_last(struct page *page)
859 page->_last_cpupid = -1 & LAST_CPUPID_MASK;
862 static inline int page_cpupid_last(struct page *page)
864 return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
867 extern int page_cpupid_xchg_last(struct page *page, int cpupid);
869 static inline void page_cpupid_reset_last(struct page *page)
871 int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
873 page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
874 page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
876 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
877 #else /* !CONFIG_NUMA_BALANCING */
878 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
880 return page_to_nid(page); /* XXX */
883 static inline int page_cpupid_last(struct page *page)
885 return page_to_nid(page); /* XXX */
888 static inline int cpupid_to_nid(int cpupid)
893 static inline int cpupid_to_pid(int cpupid)
898 static inline int cpupid_to_cpu(int cpupid)
903 static inline int cpu_pid_to_cpupid(int nid, int pid)
908 static inline bool cpupid_pid_unset(int cpupid)
913 static inline void page_cpupid_reset_last(struct page *page)
917 static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
921 #endif /* CONFIG_NUMA_BALANCING */
923 static inline struct zone *page_zone(const struct page *page)
925 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
928 #ifdef SECTION_IN_PAGE_FLAGS
929 static inline void set_page_section(struct page *page, unsigned long section)
931 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
932 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
935 static inline unsigned long page_to_section(const struct page *page)
937 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
941 static inline void set_page_zone(struct page *page, enum zone_type zone)
943 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
944 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
947 static inline void set_page_node(struct page *page, unsigned long node)
949 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
950 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
953 static inline void set_page_links(struct page *page, enum zone_type zone,
954 unsigned long node, unsigned long pfn)
956 set_page_zone(page, zone);
957 set_page_node(page, node);
958 #ifdef SECTION_IN_PAGE_FLAGS
959 set_page_section(page, pfn_to_section_nr(pfn));
964 * Some inline functions in vmstat.h depend on page_zone()
966 #include <linux/vmstat.h>
968 static __always_inline void *lowmem_page_address(const struct page *page)
970 return __va(PFN_PHYS(page_to_pfn(page)));
973 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
974 #define HASHED_PAGE_VIRTUAL
977 #if defined(WANT_PAGE_VIRTUAL)
978 static inline void *page_address(const struct page *page)
980 return page->virtual;
982 static inline void set_page_address(struct page *page, void *address)
984 page->virtual = address;
986 #define page_address_init() do { } while(0)
989 #if defined(HASHED_PAGE_VIRTUAL)
990 void *page_address(const struct page *page);
991 void set_page_address(struct page *page, void *virtual);
992 void page_address_init(void);
995 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
996 #define page_address(page) lowmem_page_address(page)
997 #define set_page_address(page, address) do { } while(0)
998 #define page_address_init() do { } while(0)
1002 * On an anonymous page mapped into a user virtual memory area,
1003 * page->mapping points to its anon_vma, not to a struct address_space;
1004 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
1006 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
1007 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
1008 * and then page->mapping points, not to an anon_vma, but to a private
1009 * structure which KSM associates with that merged page. See ksm.h.
1011 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
1013 * Please note that, confusingly, "page_mapping" refers to the inode
1014 * address_space which maps the page from disk; whereas "page_mapped"
1015 * refers to user virtual address space into which the page is mapped.
1017 #define PAGE_MAPPING_ANON 1
1018 #define PAGE_MAPPING_KSM 2
1019 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
1021 extern struct address_space *page_mapping(struct page *page);
1023 /* Neutral page->mapping pointer to address_space or anon_vma or other */
1024 static inline void *page_rmapping(struct page *page)
1026 return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
1029 extern struct address_space *__page_file_mapping(struct page *);
1032 struct address_space *page_file_mapping(struct page *page)
1034 if (unlikely(PageSwapCache(page)))
1035 return __page_file_mapping(page);
1037 return page->mapping;
1040 static inline int PageAnon(struct page *page)
1042 return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
1046 * Return the pagecache index of the passed page. Regular pagecache pages
1047 * use ->index whereas swapcache pages use ->private
1049 static inline pgoff_t page_index(struct page *page)
1051 if (unlikely(PageSwapCache(page)))
1052 return page_private(page);
1056 extern pgoff_t __page_file_index(struct page *page);
1059 * Return the file index of the page. Regular pagecache pages use ->index
1060 * whereas swapcache pages use swp_offset(->private)
1062 static inline pgoff_t page_file_index(struct page *page)
1064 if (unlikely(PageSwapCache(page)))
1065 return __page_file_index(page);
1071 * Return true if this page is mapped into pagetables.
1073 static inline int page_mapped(struct page *page)
1075 return atomic_read(&(page)->_mapcount) >= 0;
1079 * Different kinds of faults, as returned by handle_mm_fault().
1080 * Used to decide whether a process gets delivered SIGBUS or
1081 * just gets major/minor fault counters bumped up.
1084 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1086 #define VM_FAULT_OOM 0x0001
1087 #define VM_FAULT_SIGBUS 0x0002
1088 #define VM_FAULT_MAJOR 0x0004
1089 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1090 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1091 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1092 #define VM_FAULT_SIGSEGV 0x0040
1094 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1095 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1096 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1097 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1099 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1101 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1102 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1105 /* Encode hstate index for a hwpoisoned large page */
1106 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1107 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1110 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1112 extern void pagefault_out_of_memory(void);
1114 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1117 * Flags passed to show_mem() and show_free_areas() to suppress output in
1120 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1122 extern void show_free_areas(unsigned int flags);
1123 extern bool skip_free_areas_node(unsigned int flags, int nid);
1125 int shmem_zero_setup(struct vm_area_struct *);
1127 bool shmem_mapping(struct address_space *mapping);
1129 static inline bool shmem_mapping(struct address_space *mapping)
1135 extern int can_do_mlock(void);
1136 extern int user_shm_lock(size_t, struct user_struct *);
1137 extern void user_shm_unlock(size_t, struct user_struct *);
1140 * Parameter block passed down to zap_pte_range in exceptional cases.
1142 struct zap_details {
1143 struct address_space *check_mapping; /* Check page->mapping if set */
1144 pgoff_t first_index; /* Lowest page->index to unmap */
1145 pgoff_t last_index; /* Highest page->index to unmap */
1148 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
1151 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1152 unsigned long size);
1153 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
1154 unsigned long size, struct zap_details *);
1155 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
1156 unsigned long start, unsigned long end);
1159 * mm_walk - callbacks for walk_page_range
1160 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
1161 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1162 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1163 * this handler is required to be able to handle
1164 * pmd_trans_huge() pmds. They may simply choose to
1165 * split_huge_page() instead of handling it explicitly.
1166 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1167 * @pte_hole: if set, called for each hole at all levels
1168 * @hugetlb_entry: if set, called for each hugetlb entry
1169 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
1172 * (see walk_page_range for more details)
1175 int (*pgd_entry)(pgd_t *pgd, unsigned long addr,
1176 unsigned long next, struct mm_walk *walk);
1177 int (*pud_entry)(pud_t *pud, unsigned long addr,
1178 unsigned long next, struct mm_walk *walk);
1179 int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1180 unsigned long next, struct mm_walk *walk);
1181 int (*pte_entry)(pte_t *pte, unsigned long addr,
1182 unsigned long next, struct mm_walk *walk);
1183 int (*pte_hole)(unsigned long addr, unsigned long next,
1184 struct mm_walk *walk);
1185 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1186 unsigned long addr, unsigned long next,
1187 struct mm_walk *walk);
1188 struct mm_struct *mm;
1192 int walk_page_range(unsigned long addr, unsigned long end,
1193 struct mm_walk *walk);
1194 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1195 unsigned long end, unsigned long floor, unsigned long ceiling);
1196 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1197 struct vm_area_struct *vma);
1198 void unmap_mapping_range(struct address_space *mapping,
1199 loff_t const holebegin, loff_t const holelen, int even_cows);
1200 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1201 unsigned long *pfn);
1202 int follow_phys(struct vm_area_struct *vma, unsigned long address,
1203 unsigned int flags, unsigned long *prot, resource_size_t *phys);
1204 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1205 void *buf, int len, int write);
1207 static inline void unmap_shared_mapping_range(struct address_space *mapping,
1208 loff_t const holebegin, loff_t const holelen)
1210 unmap_mapping_range(mapping, holebegin, holelen, 0);
1213 extern void truncate_pagecache(struct inode *inode, loff_t new);
1214 extern void truncate_setsize(struct inode *inode, loff_t newsize);
1215 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
1216 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1217 int truncate_inode_page(struct address_space *mapping, struct page *page);
1218 int generic_error_remove_page(struct address_space *mapping, struct page *page);
1219 int invalidate_inode_page(struct page *page);
1222 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
1223 unsigned long address, unsigned int flags);
1224 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1225 unsigned long address, unsigned int fault_flags);
1227 static inline int handle_mm_fault(struct mm_struct *mm,
1228 struct vm_area_struct *vma, unsigned long address,
1231 /* should never happen if there's no MMU */
1233 return VM_FAULT_SIGBUS;
1235 static inline int fixup_user_fault(struct task_struct *tsk,
1236 struct mm_struct *mm, unsigned long address,
1237 unsigned int fault_flags)
1239 /* should never happen if there's no MMU */
1245 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
1246 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1247 void *buf, int len, int write);
1249 long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1250 unsigned long start, unsigned long nr_pages,
1251 unsigned int foll_flags, struct page **pages,
1252 struct vm_area_struct **vmas, int *nonblocking);
1253 long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1254 unsigned long start, unsigned long nr_pages,
1255 int write, int force, struct page **pages,
1256 struct vm_area_struct **vmas);
1257 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1258 struct page **pages);
1260 int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1261 struct page **pages);
1262 int get_kernel_page(unsigned long start, int write, struct page **pages);
1263 struct page *get_dump_page(unsigned long addr);
1265 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1266 extern void do_invalidatepage(struct page *page, unsigned int offset,
1267 unsigned int length);
1269 int __set_page_dirty_nobuffers(struct page *page);
1270 int __set_page_dirty_no_writeback(struct page *page);
1271 int redirty_page_for_writepage(struct writeback_control *wbc,
1273 void account_page_dirtied(struct page *page, struct address_space *mapping);
1274 int set_page_dirty(struct page *page);
1275 int set_page_dirty_lock(struct page *page);
1276 int clear_page_dirty_for_io(struct page *page);
1277 int get_cmdline(struct task_struct *task, char *buffer, int buflen);
1279 /* Is the vma a continuation of the stack vma above it? */
1280 static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1282 return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
1285 static inline int stack_guard_page_start(struct vm_area_struct *vma,
1288 return (vma->vm_flags & VM_GROWSDOWN) &&
1289 (vma->vm_start == addr) &&
1290 !vma_growsdown(vma->vm_prev, addr);
1293 /* Is the vma a continuation of the stack vma below it? */
1294 static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
1296 return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
1299 static inline int stack_guard_page_end(struct vm_area_struct *vma,
1302 return (vma->vm_flags & VM_GROWSUP) &&
1303 (vma->vm_end == addr) &&
1304 !vma_growsup(vma->vm_next, addr);
1307 extern struct task_struct *task_of_stack(struct task_struct *task,
1308 struct vm_area_struct *vma, bool in_group);
1310 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1311 unsigned long old_addr, struct vm_area_struct *new_vma,
1312 unsigned long new_addr, unsigned long len,
1313 bool need_rmap_locks);
1314 extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1315 unsigned long end, pgprot_t newprot,
1316 int dirty_accountable, int prot_numa);
1317 extern int mprotect_fixup(struct vm_area_struct *vma,
1318 struct vm_area_struct **pprev, unsigned long start,
1319 unsigned long end, unsigned long newflags);
1322 * doesn't attempt to fault and will return short.
1324 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1325 struct page **pages);
1327 * per-process(per-mm_struct) statistics.
1329 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1331 long val = atomic_long_read(&mm->rss_stat.count[member]);
1333 #ifdef SPLIT_RSS_COUNTING
1335 * counter is updated in asynchronous manner and may go to minus.
1336 * But it's never be expected number for users.
1341 return (unsigned long)val;
1344 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1346 atomic_long_add(value, &mm->rss_stat.count[member]);
1349 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1351 atomic_long_inc(&mm->rss_stat.count[member]);
1354 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1356 atomic_long_dec(&mm->rss_stat.count[member]);
1359 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1361 return get_mm_counter(mm, MM_FILEPAGES) +
1362 get_mm_counter(mm, MM_ANONPAGES);
1365 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1367 return max(mm->hiwater_rss, get_mm_rss(mm));
1370 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1372 return max(mm->hiwater_vm, mm->total_vm);
1375 static inline void update_hiwater_rss(struct mm_struct *mm)
1377 unsigned long _rss = get_mm_rss(mm);
1379 if ((mm)->hiwater_rss < _rss)
1380 (mm)->hiwater_rss = _rss;
1383 static inline void update_hiwater_vm(struct mm_struct *mm)
1385 if (mm->hiwater_vm < mm->total_vm)
1386 mm->hiwater_vm = mm->total_vm;
1389 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1390 struct mm_struct *mm)
1392 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1394 if (*maxrss < hiwater_rss)
1395 *maxrss = hiwater_rss;
1398 #if defined(SPLIT_RSS_COUNTING)
1399 void sync_mm_rss(struct mm_struct *mm);
1401 static inline void sync_mm_rss(struct mm_struct *mm)
1406 int vma_wants_writenotify(struct vm_area_struct *vma);
1408 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1410 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1414 __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1418 #ifdef __PAGETABLE_PUD_FOLDED
1419 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1420 unsigned long address)
1425 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1428 #ifdef __PAGETABLE_PMD_FOLDED
1429 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1430 unsigned long address)
1435 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1438 int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1439 pmd_t *pmd, unsigned long address);
1440 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1443 * The following ifdef needed to get the 4level-fixup.h header to work.
1444 * Remove it when 4level-fixup.h has been removed.
1446 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1447 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1449 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1450 NULL: pud_offset(pgd, address);
1453 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1455 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1456 NULL: pmd_offset(pud, address);
1458 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1460 #if USE_SPLIT_PTE_PTLOCKS
1461 #if ALLOC_SPLIT_PTLOCKS
1462 void __init ptlock_cache_init(void);
1463 extern bool ptlock_alloc(struct page *page);
1464 extern void ptlock_free(struct page *page);
1466 static inline spinlock_t *ptlock_ptr(struct page *page)
1470 #else /* ALLOC_SPLIT_PTLOCKS */
1471 static inline void ptlock_cache_init(void)
1475 static inline bool ptlock_alloc(struct page *page)
1480 static inline void ptlock_free(struct page *page)
1484 static inline spinlock_t *ptlock_ptr(struct page *page)
1488 #endif /* ALLOC_SPLIT_PTLOCKS */
1490 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1492 return ptlock_ptr(pmd_page(*pmd));
1495 static inline bool ptlock_init(struct page *page)
1498 * prep_new_page() initialize page->private (and therefore page->ptl)
1499 * with 0. Make sure nobody took it in use in between.
1501 * It can happen if arch try to use slab for page table allocation:
1502 * slab code uses page->slab_cache and page->first_page (for tail
1503 * pages), which share storage with page->ptl.
1505 VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
1506 if (!ptlock_alloc(page))
1508 spin_lock_init(ptlock_ptr(page));
1512 /* Reset page->mapping so free_pages_check won't complain. */
1513 static inline void pte_lock_deinit(struct page *page)
1515 page->mapping = NULL;
1519 #else /* !USE_SPLIT_PTE_PTLOCKS */
1521 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1523 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1525 return &mm->page_table_lock;
1527 static inline void ptlock_cache_init(void) {}
1528 static inline bool ptlock_init(struct page *page) { return true; }
1529 static inline void pte_lock_deinit(struct page *page) {}
1530 #endif /* USE_SPLIT_PTE_PTLOCKS */
1532 static inline void pgtable_init(void)
1534 ptlock_cache_init();
1535 pgtable_cache_init();
1538 static inline bool pgtable_page_ctor(struct page *page)
1540 inc_zone_page_state(page, NR_PAGETABLE);
1541 return ptlock_init(page);
1544 static inline void pgtable_page_dtor(struct page *page)
1546 pte_lock_deinit(page);
1547 dec_zone_page_state(page, NR_PAGETABLE);
1550 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1552 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1553 pte_t *__pte = pte_offset_map(pmd, address); \
1559 #define pte_unmap_unlock(pte, ptl) do { \
1564 #define pte_alloc_map(mm, vma, pmd, address) \
1565 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1567 NULL: pte_offset_map(pmd, address))
1569 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1570 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1572 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1574 #define pte_alloc_kernel(pmd, address) \
1575 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1576 NULL: pte_offset_kernel(pmd, address))
1578 #if USE_SPLIT_PMD_PTLOCKS
1580 static struct page *pmd_to_page(pmd_t *pmd)
1582 unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
1583 return virt_to_page((void *)((unsigned long) pmd & mask));
1586 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1588 return ptlock_ptr(pmd_to_page(pmd));
1591 static inline bool pgtable_pmd_page_ctor(struct page *page)
1593 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1594 page->pmd_huge_pte = NULL;
1596 return ptlock_init(page);
1599 static inline void pgtable_pmd_page_dtor(struct page *page)
1601 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1602 VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
1607 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1611 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1613 return &mm->page_table_lock;
1616 static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
1617 static inline void pgtable_pmd_page_dtor(struct page *page) {}
1619 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1623 static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
1625 spinlock_t *ptl = pmd_lockptr(mm, pmd);
1630 extern void free_area_init(unsigned long * zones_size);
1631 extern void free_area_init_node(int nid, unsigned long * zones_size,
1632 unsigned long zone_start_pfn, unsigned long *zholes_size);
1633 extern void free_initmem(void);
1636 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1637 * into the buddy system. The freed pages will be poisoned with pattern
1638 * "poison" if it's within range [0, UCHAR_MAX].
1639 * Return pages freed into the buddy system.
1641 extern unsigned long free_reserved_area(void *start, void *end,
1642 int poison, char *s);
1644 #ifdef CONFIG_HIGHMEM
1646 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1647 * and totalram_pages.
1649 extern void free_highmem_page(struct page *page);
1652 extern void adjust_managed_page_count(struct page *page, long count);
1653 extern void mem_init_print_info(const char *str);
1655 /* Free the reserved page into the buddy system, so it gets managed. */
1656 static inline void __free_reserved_page(struct page *page)
1658 ClearPageReserved(page);
1659 init_page_count(page);
1663 static inline void free_reserved_page(struct page *page)
1665 __free_reserved_page(page);
1666 adjust_managed_page_count(page, 1);
1669 static inline void mark_page_reserved(struct page *page)
1671 SetPageReserved(page);
1672 adjust_managed_page_count(page, -1);
1676 * Default method to free all the __init memory into the buddy system.
1677 * The freed pages will be poisoned with pattern "poison" if it's within
1678 * range [0, UCHAR_MAX].
1679 * Return pages freed into the buddy system.
1681 static inline unsigned long free_initmem_default(int poison)
1683 extern char __init_begin[], __init_end[];
1685 return free_reserved_area(&__init_begin, &__init_end,
1686 poison, "unused kernel");
1689 static inline unsigned long get_num_physpages(void)
1692 unsigned long phys_pages = 0;
1694 for_each_online_node(nid)
1695 phys_pages += node_present_pages(nid);
1700 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1702 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1703 * zones, allocate the backing mem_map and account for memory holes in a more
1704 * architecture independent manner. This is a substitute for creating the
1705 * zone_sizes[] and zholes_size[] arrays and passing them to
1706 * free_area_init_node()
1708 * An architecture is expected to register range of page frames backed by
1709 * physical memory with memblock_add[_node]() before calling
1710 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1711 * usage, an architecture is expected to do something like
1713 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1715 * for_each_valid_physical_page_range()
1716 * memblock_add_node(base, size, nid)
1717 * free_area_init_nodes(max_zone_pfns);
1719 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1720 * registered physical page range. Similarly
1721 * sparse_memory_present_with_active_regions() calls memory_present() for
1722 * each range when SPARSEMEM is enabled.
1724 * See mm/page_alloc.c for more information on each function exposed by
1725 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1727 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1728 unsigned long node_map_pfn_alignment(void);
1729 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1730 unsigned long end_pfn);
1731 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1732 unsigned long end_pfn);
1733 extern void get_pfn_range_for_nid(unsigned int nid,
1734 unsigned long *start_pfn, unsigned long *end_pfn);
1735 extern unsigned long find_min_pfn_with_active_regions(void);
1736 extern void free_bootmem_with_active_regions(int nid,
1737 unsigned long max_low_pfn);
1738 extern void sparse_memory_present_with_active_regions(int nid);
1740 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1742 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1743 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1744 static inline int __early_pfn_to_nid(unsigned long pfn)
1749 /* please see mm/page_alloc.c */
1750 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1751 /* there is a per-arch backend function. */
1752 extern int __meminit __early_pfn_to_nid(unsigned long pfn);
1755 extern void set_dma_reserve(unsigned long new_dma_reserve);
1756 extern void memmap_init_zone(unsigned long, int, unsigned long,
1757 unsigned long, enum memmap_context);
1758 extern void setup_per_zone_wmarks(void);
1759 extern int __meminit init_per_zone_wmark_min(void);
1760 extern void mem_init(void);
1761 extern void __init mmap_init(void);
1762 extern void show_mem(unsigned int flags);
1763 extern void si_meminfo(struct sysinfo * val);
1764 extern void si_meminfo_node(struct sysinfo *val, int nid);
1766 extern __printf(3, 4)
1767 void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
1769 extern void setup_per_cpu_pageset(void);
1771 extern void zone_pcp_update(struct zone *zone);
1772 extern void zone_pcp_reset(struct zone *zone);
1775 extern int min_free_kbytes;
1778 extern atomic_long_t mmap_pages_allocated;
1779 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1781 /* interval_tree.c */
1782 void vma_interval_tree_insert(struct vm_area_struct *node,
1783 struct rb_root *root);
1784 void vma_interval_tree_insert_after(struct vm_area_struct *node,
1785 struct vm_area_struct *prev,
1786 struct rb_root *root);
1787 void vma_interval_tree_remove(struct vm_area_struct *node,
1788 struct rb_root *root);
1789 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1790 unsigned long start, unsigned long last);
1791 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1792 unsigned long start, unsigned long last);
1794 #define vma_interval_tree_foreach(vma, root, start, last) \
1795 for (vma = vma_interval_tree_iter_first(root, start, last); \
1796 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1798 void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1799 struct rb_root *root);
1800 void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1801 struct rb_root *root);
1802 struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1803 struct rb_root *root, unsigned long start, unsigned long last);
1804 struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1805 struct anon_vma_chain *node, unsigned long start, unsigned long last);
1806 #ifdef CONFIG_DEBUG_VM_RB
1807 void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1810 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1811 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1812 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1815 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1816 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1817 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1818 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1819 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1820 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1821 struct mempolicy *);
1822 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1823 extern int split_vma(struct mm_struct *,
1824 struct vm_area_struct *, unsigned long addr, int new_below);
1825 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1826 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1827 struct rb_node **, struct rb_node *);
1828 extern void unlink_file_vma(struct vm_area_struct *);
1829 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1830 unsigned long addr, unsigned long len, pgoff_t pgoff,
1831 bool *need_rmap_locks);
1832 extern void exit_mmap(struct mm_struct *);
1834 static inline int check_data_rlimit(unsigned long rlim,
1836 unsigned long start,
1837 unsigned long end_data,
1838 unsigned long start_data)
1840 if (rlim < RLIM_INFINITY) {
1841 if (((new - start) + (end_data - start_data)) > rlim)
1848 extern int mm_take_all_locks(struct mm_struct *mm);
1849 extern void mm_drop_all_locks(struct mm_struct *mm);
1851 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1852 extern struct file *get_mm_exe_file(struct mm_struct *mm);
1854 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1855 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
1856 unsigned long addr, unsigned long len,
1857 unsigned long flags,
1858 const struct vm_special_mapping *spec);
1859 /* This is an obsolete alternative to _install_special_mapping. */
1860 extern int install_special_mapping(struct mm_struct *mm,
1861 unsigned long addr, unsigned long len,
1862 unsigned long flags, struct page **pages);
1864 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1866 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1867 unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
1868 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1869 unsigned long len, unsigned long prot, unsigned long flags,
1870 unsigned long pgoff, unsigned long *populate);
1871 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1874 extern int __mm_populate(unsigned long addr, unsigned long len,
1876 static inline void mm_populate(unsigned long addr, unsigned long len)
1879 (void) __mm_populate(addr, len, 1);
1882 static inline void mm_populate(unsigned long addr, unsigned long len) {}
1885 /* These take the mm semaphore themselves */
1886 extern unsigned long vm_brk(unsigned long, unsigned long);
1887 extern int vm_munmap(unsigned long, size_t);
1888 extern unsigned long vm_mmap(struct file *, unsigned long,
1889 unsigned long, unsigned long,
1890 unsigned long, unsigned long);
1892 struct vm_unmapped_area_info {
1893 #define VM_UNMAPPED_AREA_TOPDOWN 1
1894 unsigned long flags;
1895 unsigned long length;
1896 unsigned long low_limit;
1897 unsigned long high_limit;
1898 unsigned long align_mask;
1899 unsigned long align_offset;
1902 extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
1903 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
1906 * Search for an unmapped address range.
1908 * We are looking for a range that:
1909 * - does not intersect with any VMA;
1910 * - is contained within the [low_limit, high_limit) interval;
1911 * - is at least the desired size.
1912 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1914 static inline unsigned long
1915 vm_unmapped_area(struct vm_unmapped_area_info *info)
1917 if (!(info->flags & VM_UNMAPPED_AREA_TOPDOWN))
1918 return unmapped_area(info);
1920 return unmapped_area_topdown(info);
1924 extern void truncate_inode_pages(struct address_space *, loff_t);
1925 extern void truncate_inode_pages_range(struct address_space *,
1926 loff_t lstart, loff_t lend);
1927 extern void truncate_inode_pages_final(struct address_space *);
1929 /* generic vm_area_ops exported for stackable file systems */
1930 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1931 extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
1932 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1934 /* mm/page-writeback.c */
1935 int write_one_page(struct page *page, int wait);
1936 void task_dirty_inc(struct task_struct *tsk);
1939 #define VM_MAX_READAHEAD 128 /* kbytes */
1940 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1942 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1943 pgoff_t offset, unsigned long nr_to_read);
1945 void page_cache_sync_readahead(struct address_space *mapping,
1946 struct file_ra_state *ra,
1949 unsigned long size);
1951 void page_cache_async_readahead(struct address_space *mapping,
1952 struct file_ra_state *ra,
1956 unsigned long size);
1958 unsigned long max_sane_readahead(unsigned long nr);
1960 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1961 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1963 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1964 extern int expand_downwards(struct vm_area_struct *vma,
1965 unsigned long address);
1967 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1969 #define expand_upwards(vma, address) (0)
1972 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1973 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1974 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1975 struct vm_area_struct **pprev);
1977 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1978 NULL if none. Assume start_addr < end_addr. */
1979 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1981 struct vm_area_struct * vma = find_vma(mm,start_addr);
1983 if (vma && end_addr <= vma->vm_start)
1988 static inline unsigned long vma_pages(struct vm_area_struct *vma)
1990 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
1993 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1994 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
1995 unsigned long vm_start, unsigned long vm_end)
1997 struct vm_area_struct *vma = find_vma(mm, vm_start);
1999 if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
2006 pgprot_t vm_get_page_prot(unsigned long vm_flags);
2007 void vma_set_page_prot(struct vm_area_struct *vma);
2009 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
2013 static inline void vma_set_page_prot(struct vm_area_struct *vma)
2015 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
2019 #ifdef CONFIG_NUMA_BALANCING
2020 unsigned long change_prot_numa(struct vm_area_struct *vma,
2021 unsigned long start, unsigned long end);
2024 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
2025 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
2026 unsigned long pfn, unsigned long size, pgprot_t);
2027 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
2028 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
2030 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
2032 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
2035 struct page *follow_page_mask(struct vm_area_struct *vma,
2036 unsigned long address, unsigned int foll_flags,
2037 unsigned int *page_mask);
2039 static inline struct page *follow_page(struct vm_area_struct *vma,
2040 unsigned long address, unsigned int foll_flags)
2042 unsigned int unused_page_mask;
2043 return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
2046 #define FOLL_WRITE 0x01 /* check pte is writable */
2047 #define FOLL_TOUCH 0x02 /* mark page accessed */
2048 #define FOLL_GET 0x04 /* do get_page on page */
2049 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2050 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2051 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2052 * and return without waiting upon it */
2053 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
2054 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2055 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2056 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2057 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2058 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2060 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
2062 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
2063 unsigned long size, pte_fn_t fn, void *data);
2065 #ifdef CONFIG_PROC_FS
2066 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
2068 static inline void vm_stat_account(struct mm_struct *mm,
2069 unsigned long flags, struct file *file, long pages)
2071 mm->total_vm += pages;
2073 #endif /* CONFIG_PROC_FS */
2075 #ifdef CONFIG_DEBUG_PAGEALLOC
2076 extern bool _debug_pagealloc_enabled;
2077 extern void __kernel_map_pages(struct page *page, int numpages, int enable);
2079 static inline bool debug_pagealloc_enabled(void)
2081 return _debug_pagealloc_enabled;
2085 kernel_map_pages(struct page *page, int numpages, int enable)
2087 if (!debug_pagealloc_enabled())
2090 __kernel_map_pages(page, numpages, enable);
2092 #ifdef CONFIG_HIBERNATION
2093 extern bool kernel_page_present(struct page *page);
2094 #endif /* CONFIG_HIBERNATION */
2097 kernel_map_pages(struct page *page, int numpages, int enable) {}
2098 #ifdef CONFIG_HIBERNATION
2099 static inline bool kernel_page_present(struct page *page) { return true; }
2100 #endif /* CONFIG_HIBERNATION */
2103 #ifdef __HAVE_ARCH_GATE_AREA
2104 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
2105 extern int in_gate_area_no_mm(unsigned long addr);
2106 extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
2108 static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
2112 static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
2113 static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
2117 #endif /* __HAVE_ARCH_GATE_AREA */
2119 #ifdef CONFIG_SYSCTL
2120 extern int sysctl_drop_caches;
2121 int drop_caches_sysctl_handler(struct ctl_table *, int,
2122 void __user *, size_t *, loff_t *);
2125 unsigned long shrink_node_slabs(gfp_t gfp_mask, int nid,
2126 unsigned long nr_scanned,
2127 unsigned long nr_eligible);
2130 #define randomize_va_space 0
2132 extern int randomize_va_space;
2135 const char * arch_vma_name(struct vm_area_struct *vma);
2136 void print_vma_addr(char *prefix, unsigned long rip);
2138 void sparse_mem_maps_populate_node(struct page **map_map,
2139 unsigned long pnum_begin,
2140 unsigned long pnum_end,
2141 unsigned long map_count,
2144 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
2145 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
2146 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
2147 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
2148 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
2149 void *vmemmap_alloc_block(unsigned long size, int node);
2150 void *vmemmap_alloc_block_buf(unsigned long size, int node);
2151 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
2152 int vmemmap_populate_basepages(unsigned long start, unsigned long end,
2154 int vmemmap_populate(unsigned long start, unsigned long end, int node);
2155 void vmemmap_populate_print_last(void);
2156 #ifdef CONFIG_MEMORY_HOTPLUG
2157 void vmemmap_free(unsigned long start, unsigned long end);
2159 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
2160 unsigned long size);
2163 MF_COUNT_INCREASED = 1 << 0,
2164 MF_ACTION_REQUIRED = 1 << 1,
2165 MF_MUST_KILL = 1 << 2,
2166 MF_SOFT_OFFLINE = 1 << 3,
2168 extern int memory_failure(unsigned long pfn, int trapno, int flags);
2169 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
2170 extern int unpoison_memory(unsigned long pfn);
2171 extern int sysctl_memory_failure_early_kill;
2172 extern int sysctl_memory_failure_recovery;
2173 extern void shake_page(struct page *p, int access);
2174 extern atomic_long_t num_poisoned_pages;
2175 extern int soft_offline_page(struct page *page, int flags);
2177 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2178 extern void clear_huge_page(struct page *page,
2180 unsigned int pages_per_huge_page);
2181 extern void copy_user_huge_page(struct page *dst, struct page *src,
2182 unsigned long addr, struct vm_area_struct *vma,
2183 unsigned int pages_per_huge_page);
2184 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2186 extern struct page_ext_operations debug_guardpage_ops;
2187 extern struct page_ext_operations page_poisoning_ops;
2189 #ifdef CONFIG_DEBUG_PAGEALLOC
2190 extern unsigned int _debug_guardpage_minorder;
2191 extern bool _debug_guardpage_enabled;
2193 static inline unsigned int debug_guardpage_minorder(void)
2195 return _debug_guardpage_minorder;
2198 static inline bool debug_guardpage_enabled(void)
2200 return _debug_guardpage_enabled;
2203 static inline bool page_is_guard(struct page *page)
2205 struct page_ext *page_ext;
2207 if (!debug_guardpage_enabled())
2210 page_ext = lookup_page_ext(page);
2211 return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
2214 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2215 static inline bool debug_guardpage_enabled(void) { return false; }
2216 static inline bool page_is_guard(struct page *page) { return false; }
2217 #endif /* CONFIG_DEBUG_PAGEALLOC */
2219 #if MAX_NUMNODES > 1
2220 void __init setup_nr_node_ids(void);
2222 static inline void setup_nr_node_ids(void) {}
2225 #endif /* __KERNEL__ */
2226 #endif /* _LINUX_MM_H */