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_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
142 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
143 #define VM_ARCH_2 0x02000000
144 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
146 #ifdef CONFIG_MEM_SOFT_DIRTY
147 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
149 # define VM_SOFTDIRTY 0
152 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
153 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
154 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
155 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
157 #if defined(CONFIG_X86)
158 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
159 #elif defined(CONFIG_PPC)
160 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
161 #elif defined(CONFIG_PARISC)
162 # define VM_GROWSUP VM_ARCH_1
163 #elif defined(CONFIG_METAG)
164 # define VM_GROWSUP VM_ARCH_1
165 #elif defined(CONFIG_IA64)
166 # define VM_GROWSUP VM_ARCH_1
167 #elif !defined(CONFIG_MMU)
168 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
171 #if defined(CONFIG_X86)
172 /* MPX specific bounds table or bounds directory */
173 # define VM_MPX VM_ARCH_2
177 # define VM_GROWSUP VM_NONE
180 /* Bits set in the VMA until the stack is in its final location */
181 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
183 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
184 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
187 #ifdef CONFIG_STACK_GROWSUP
188 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
190 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
194 * Special vmas that are non-mergable, non-mlock()able.
195 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
197 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
199 /* This mask defines which mm->def_flags a process can inherit its parent */
200 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
203 * mapping from the currently active vm_flags protection bits (the
204 * low four bits) to a page protection mask..
206 extern pgprot_t protection_map[16];
208 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
209 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
210 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
211 #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */
212 #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */
213 #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */
214 #define FAULT_FLAG_TRIED 0x40 /* second try */
215 #define FAULT_FLAG_USER 0x80 /* The fault originated in userspace */
218 * vm_fault is filled by the the pagefault handler and passed to the vma's
219 * ->fault function. The vma's ->fault is responsible for returning a bitmask
220 * of VM_FAULT_xxx flags that give details about how the fault was handled.
222 * pgoff should be used in favour of virtual_address, if possible. If pgoff
223 * is used, one may implement ->remap_pages to get nonlinear mapping support.
226 unsigned int flags; /* FAULT_FLAG_xxx flags */
227 pgoff_t pgoff; /* Logical page offset based on vma */
228 void __user *virtual_address; /* Faulting virtual address */
230 struct page *page; /* ->fault handlers should return a
231 * page here, unless VM_FAULT_NOPAGE
232 * is set (which is also implied by
235 /* for ->map_pages() only */
236 pgoff_t max_pgoff; /* map pages for offset from pgoff till
237 * max_pgoff inclusive */
238 pte_t *pte; /* pte entry associated with ->pgoff */
242 * These are the virtual MM functions - opening of an area, closing and
243 * unmapping it (needed to keep files on disk up-to-date etc), pointer
244 * to the functions called when a no-page or a wp-page exception occurs.
246 struct vm_operations_struct {
247 void (*open)(struct vm_area_struct * area);
248 void (*close)(struct vm_area_struct * area);
249 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
250 void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
252 /* notification that a previously read-only page is about to become
253 * writable, if an error is returned it will cause a SIGBUS */
254 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
256 /* called by access_process_vm when get_user_pages() fails, typically
257 * for use by special VMAs that can switch between memory and hardware
259 int (*access)(struct vm_area_struct *vma, unsigned long addr,
260 void *buf, int len, int write);
262 /* Called by the /proc/PID/maps code to ask the vma whether it
263 * has a special name. Returning non-NULL will also cause this
264 * vma to be dumped unconditionally. */
265 const char *(*name)(struct vm_area_struct *vma);
269 * set_policy() op must add a reference to any non-NULL @new mempolicy
270 * to hold the policy upon return. Caller should pass NULL @new to
271 * remove a policy and fall back to surrounding context--i.e. do not
272 * install a MPOL_DEFAULT policy, nor the task or system default
275 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
278 * get_policy() op must add reference [mpol_get()] to any policy at
279 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
280 * in mm/mempolicy.c will do this automatically.
281 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
282 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
283 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
284 * must return NULL--i.e., do not "fallback" to task or system default
287 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
290 /* called by sys_remap_file_pages() to populate non-linear mapping */
291 int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr,
292 unsigned long size, pgoff_t pgoff);
298 #define page_private(page) ((page)->private)
299 #define set_page_private(page, v) ((page)->private = (v))
301 /* It's valid only if the page is free path or free_list */
302 static inline void set_freepage_migratetype(struct page *page, int migratetype)
304 page->index = migratetype;
307 /* It's valid only if the page is free path or free_list */
308 static inline int get_freepage_migratetype(struct page *page)
314 * FIXME: take this include out, include page-flags.h in
315 * files which need it (119 of them)
317 #include <linux/page-flags.h>
318 #include <linux/huge_mm.h>
321 * Methods to modify the page usage count.
323 * What counts for a page usage:
324 * - cache mapping (page->mapping)
325 * - private data (page->private)
326 * - page mapped in a task's page tables, each mapping
327 * is counted separately
329 * Also, many kernel routines increase the page count before a critical
330 * routine so they can be sure the page doesn't go away from under them.
334 * Drop a ref, return true if the refcount fell to zero (the page has no users)
336 static inline int put_page_testzero(struct page *page)
338 VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page);
339 return atomic_dec_and_test(&page->_count);
343 * Try to grab a ref unless the page has a refcount of zero, return false if
345 * This can be called when MMU is off so it must not access
346 * any of the virtual mappings.
348 static inline int get_page_unless_zero(struct page *page)
350 return atomic_inc_not_zero(&page->_count);
354 * Try to drop a ref unless the page has a refcount of one, return false if
356 * This is to make sure that the refcount won't become zero after this drop.
357 * This can be called when MMU is off so it must not access
358 * any of the virtual mappings.
360 static inline int put_page_unless_one(struct page *page)
362 return atomic_add_unless(&page->_count, -1, 1);
365 extern int page_is_ram(unsigned long pfn);
366 extern int region_is_ram(resource_size_t phys_addr, unsigned long size);
368 /* Support for virtually mapped pages */
369 struct page *vmalloc_to_page(const void *addr);
370 unsigned long vmalloc_to_pfn(const void *addr);
373 * Determine if an address is within the vmalloc range
375 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
376 * is no special casing required.
378 static inline int is_vmalloc_addr(const void *x)
381 unsigned long addr = (unsigned long)x;
383 return addr >= VMALLOC_START && addr < VMALLOC_END;
389 extern int is_vmalloc_or_module_addr(const void *x);
391 static inline int is_vmalloc_or_module_addr(const void *x)
397 extern void kvfree(const void *addr);
399 static inline void compound_lock(struct page *page)
401 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
402 VM_BUG_ON_PAGE(PageSlab(page), page);
403 bit_spin_lock(PG_compound_lock, &page->flags);
407 static inline void compound_unlock(struct page *page)
409 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
410 VM_BUG_ON_PAGE(PageSlab(page), page);
411 bit_spin_unlock(PG_compound_lock, &page->flags);
415 static inline unsigned long compound_lock_irqsave(struct page *page)
417 unsigned long uninitialized_var(flags);
418 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
419 local_irq_save(flags);
425 static inline void compound_unlock_irqrestore(struct page *page,
428 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
429 compound_unlock(page);
430 local_irq_restore(flags);
434 static inline struct page *compound_head_by_tail(struct page *tail)
436 struct page *head = tail->first_page;
439 * page->first_page may be a dangling pointer to an old
440 * compound page, so recheck that it is still a tail
441 * page before returning.
444 if (likely(PageTail(tail)))
450 * Since either compound page could be dismantled asynchronously in THP
451 * or we access asynchronously arbitrary positioned struct page, there
452 * would be tail flag race. To handle this race, we should call
453 * smp_rmb() before checking tail flag. compound_head_by_tail() did it.
455 static inline struct page *compound_head(struct page *page)
457 if (unlikely(PageTail(page)))
458 return compound_head_by_tail(page);
463 * If we access compound page synchronously such as access to
464 * allocated page, there is no need to handle tail flag race, so we can
465 * check tail flag directly without any synchronization primitive.
467 static inline struct page *compound_head_fast(struct page *page)
469 if (unlikely(PageTail(page)))
470 return page->first_page;
475 * The atomic page->_mapcount, starts from -1: so that transitions
476 * both from it and to it can be tracked, using atomic_inc_and_test
477 * and atomic_add_negative(-1).
479 static inline void page_mapcount_reset(struct page *page)
481 atomic_set(&(page)->_mapcount, -1);
484 static inline int page_mapcount(struct page *page)
486 return atomic_read(&(page)->_mapcount) + 1;
489 static inline int page_count(struct page *page)
491 return atomic_read(&compound_head(page)->_count);
494 #ifdef CONFIG_HUGETLB_PAGE
495 extern int PageHeadHuge(struct page *page_head);
496 #else /* CONFIG_HUGETLB_PAGE */
497 static inline int PageHeadHuge(struct page *page_head)
501 #endif /* CONFIG_HUGETLB_PAGE */
503 static inline bool __compound_tail_refcounted(struct page *page)
505 return !PageSlab(page) && !PageHeadHuge(page);
509 * This takes a head page as parameter and tells if the
510 * tail page reference counting can be skipped.
512 * For this to be safe, PageSlab and PageHeadHuge must remain true on
513 * any given page where they return true here, until all tail pins
514 * have been released.
516 static inline bool compound_tail_refcounted(struct page *page)
518 VM_BUG_ON_PAGE(!PageHead(page), page);
519 return __compound_tail_refcounted(page);
522 static inline void get_huge_page_tail(struct page *page)
525 * __split_huge_page_refcount() cannot run from under us.
527 VM_BUG_ON_PAGE(!PageTail(page), page);
528 VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
529 VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page);
530 if (compound_tail_refcounted(page->first_page))
531 atomic_inc(&page->_mapcount);
534 extern bool __get_page_tail(struct page *page);
536 static inline void get_page(struct page *page)
538 if (unlikely(PageTail(page)))
539 if (likely(__get_page_tail(page)))
542 * Getting a normal page or the head of a compound page
543 * requires to already have an elevated page->_count.
545 VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
546 atomic_inc(&page->_count);
549 static inline struct page *virt_to_head_page(const void *x)
551 struct page *page = virt_to_page(x);
554 * We don't need to worry about synchronization of tail flag
555 * when we call virt_to_head_page() since it is only called for
556 * already allocated page and this page won't be freed until
557 * this virt_to_head_page() is finished. So use _fast variant.
559 return compound_head_fast(page);
563 * Setup the page count before being freed into the page allocator for
564 * the first time (boot or memory hotplug)
566 static inline void init_page_count(struct page *page)
568 atomic_set(&page->_count, 1);
572 * PageBuddy() indicate that the page is free and in the buddy system
573 * (see mm/page_alloc.c).
575 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
576 * -2 so that an underflow of the page_mapcount() won't be mistaken
577 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
578 * efficiently by most CPU architectures.
580 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
582 static inline int PageBuddy(struct page *page)
584 return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE;
587 static inline void __SetPageBuddy(struct page *page)
589 VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page);
590 atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE);
593 static inline void __ClearPageBuddy(struct page *page)
595 VM_BUG_ON_PAGE(!PageBuddy(page), page);
596 atomic_set(&page->_mapcount, -1);
599 #define PAGE_BALLOON_MAPCOUNT_VALUE (-256)
601 static inline int PageBalloon(struct page *page)
603 return atomic_read(&page->_mapcount) == PAGE_BALLOON_MAPCOUNT_VALUE;
606 static inline void __SetPageBalloon(struct page *page)
608 VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page);
609 atomic_set(&page->_mapcount, PAGE_BALLOON_MAPCOUNT_VALUE);
612 static inline void __ClearPageBalloon(struct page *page)
614 VM_BUG_ON_PAGE(!PageBalloon(page), page);
615 atomic_set(&page->_mapcount, -1);
618 void put_page(struct page *page);
619 void put_pages_list(struct list_head *pages);
621 void split_page(struct page *page, unsigned int order);
622 int split_free_page(struct page *page);
625 * Compound pages have a destructor function. Provide a
626 * prototype for that function and accessor functions.
627 * These are _only_ valid on the head of a PG_compound page.
629 typedef void compound_page_dtor(struct page *);
631 static inline void set_compound_page_dtor(struct page *page,
632 compound_page_dtor *dtor)
634 page[1].lru.next = (void *)dtor;
637 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
639 return (compound_page_dtor *)page[1].lru.next;
642 static inline int compound_order(struct page *page)
646 return (unsigned long)page[1].lru.prev;
649 static inline void set_compound_order(struct page *page, unsigned long order)
651 page[1].lru.prev = (void *)order;
656 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
657 * servicing faults for write access. In the normal case, do always want
658 * pte_mkwrite. But get_user_pages can cause write faults for mappings
659 * that do not have writing enabled, when used by access_process_vm.
661 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
663 if (likely(vma->vm_flags & VM_WRITE))
664 pte = pte_mkwrite(pte);
668 void do_set_pte(struct vm_area_struct *vma, unsigned long address,
669 struct page *page, pte_t *pte, bool write, bool anon);
673 * Multiple processes may "see" the same page. E.g. for untouched
674 * mappings of /dev/null, all processes see the same page full of
675 * zeroes, and text pages of executables and shared libraries have
676 * only one copy in memory, at most, normally.
678 * For the non-reserved pages, page_count(page) denotes a reference count.
679 * page_count() == 0 means the page is free. page->lru is then used for
680 * freelist management in the buddy allocator.
681 * page_count() > 0 means the page has been allocated.
683 * Pages are allocated by the slab allocator in order to provide memory
684 * to kmalloc and kmem_cache_alloc. In this case, the management of the
685 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
686 * unless a particular usage is carefully commented. (the responsibility of
687 * freeing the kmalloc memory is the caller's, of course).
689 * A page may be used by anyone else who does a __get_free_page().
690 * In this case, page_count still tracks the references, and should only
691 * be used through the normal accessor functions. The top bits of page->flags
692 * and page->virtual store page management information, but all other fields
693 * are unused and could be used privately, carefully. The management of this
694 * page is the responsibility of the one who allocated it, and those who have
695 * subsequently been given references to it.
697 * The other pages (we may call them "pagecache pages") are completely
698 * managed by the Linux memory manager: I/O, buffers, swapping etc.
699 * The following discussion applies only to them.
701 * A pagecache page contains an opaque `private' member, which belongs to the
702 * page's address_space. Usually, this is the address of a circular list of
703 * the page's disk buffers. PG_private must be set to tell the VM to call
704 * into the filesystem to release these pages.
706 * A page may belong to an inode's memory mapping. In this case, page->mapping
707 * is the pointer to the inode, and page->index is the file offset of the page,
708 * in units of PAGE_CACHE_SIZE.
710 * If pagecache pages are not associated with an inode, they are said to be
711 * anonymous pages. These may become associated with the swapcache, and in that
712 * case PG_swapcache is set, and page->private is an offset into the swapcache.
714 * In either case (swapcache or inode backed), the pagecache itself holds one
715 * reference to the page. Setting PG_private should also increment the
716 * refcount. The each user mapping also has a reference to the page.
718 * The pagecache pages are stored in a per-mapping radix tree, which is
719 * rooted at mapping->page_tree, and indexed by offset.
720 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
721 * lists, we instead now tag pages as dirty/writeback in the radix tree.
723 * All pagecache pages may be subject to I/O:
724 * - inode pages may need to be read from disk,
725 * - inode pages which have been modified and are MAP_SHARED may need
726 * to be written back to the inode on disk,
727 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
728 * modified may need to be swapped out to swap space and (later) to be read
733 * The zone field is never updated after free_area_init_core()
734 * sets it, so none of the operations on it need to be atomic.
737 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
738 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
739 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
740 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
741 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
744 * Define the bit shifts to access each section. For non-existent
745 * sections we define the shift as 0; that plus a 0 mask ensures
746 * the compiler will optimise away reference to them.
748 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
749 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
750 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
751 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
753 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
754 #ifdef NODE_NOT_IN_PAGE_FLAGS
755 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
756 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
757 SECTIONS_PGOFF : ZONES_PGOFF)
759 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
760 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
761 NODES_PGOFF : ZONES_PGOFF)
764 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
766 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
767 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
770 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
771 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
772 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
773 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
774 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
776 static inline enum zone_type page_zonenum(const struct page *page)
778 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
781 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
782 #define SECTION_IN_PAGE_FLAGS
786 * The identification function is mainly used by the buddy allocator for
787 * determining if two pages could be buddies. We are not really identifying
788 * the zone since we could be using the section number id if we do not have
789 * node id available in page flags.
790 * We only guarantee that it will return the same value for two combinable
793 static inline int page_zone_id(struct page *page)
795 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
798 static inline int zone_to_nid(struct zone *zone)
807 #ifdef NODE_NOT_IN_PAGE_FLAGS
808 extern int page_to_nid(const struct page *page);
810 static inline int page_to_nid(const struct page *page)
812 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
816 #ifdef CONFIG_NUMA_BALANCING
817 static inline int cpu_pid_to_cpupid(int cpu, int pid)
819 return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
822 static inline int cpupid_to_pid(int cpupid)
824 return cpupid & LAST__PID_MASK;
827 static inline int cpupid_to_cpu(int cpupid)
829 return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
832 static inline int cpupid_to_nid(int cpupid)
834 return cpu_to_node(cpupid_to_cpu(cpupid));
837 static inline bool cpupid_pid_unset(int cpupid)
839 return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
842 static inline bool cpupid_cpu_unset(int cpupid)
844 return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
847 static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
849 return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
852 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
853 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
854 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
856 return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
859 static inline int page_cpupid_last(struct page *page)
861 return page->_last_cpupid;
863 static inline void page_cpupid_reset_last(struct page *page)
865 page->_last_cpupid = -1 & LAST_CPUPID_MASK;
868 static inline int page_cpupid_last(struct page *page)
870 return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
873 extern int page_cpupid_xchg_last(struct page *page, int cpupid);
875 static inline void page_cpupid_reset_last(struct page *page)
877 int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
879 page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
880 page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
882 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
883 #else /* !CONFIG_NUMA_BALANCING */
884 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
886 return page_to_nid(page); /* XXX */
889 static inline int page_cpupid_last(struct page *page)
891 return page_to_nid(page); /* XXX */
894 static inline int cpupid_to_nid(int cpupid)
899 static inline int cpupid_to_pid(int cpupid)
904 static inline int cpupid_to_cpu(int cpupid)
909 static inline int cpu_pid_to_cpupid(int nid, int pid)
914 static inline bool cpupid_pid_unset(int cpupid)
919 static inline void page_cpupid_reset_last(struct page *page)
923 static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
927 #endif /* CONFIG_NUMA_BALANCING */
929 static inline struct zone *page_zone(const struct page *page)
931 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
934 #ifdef SECTION_IN_PAGE_FLAGS
935 static inline void set_page_section(struct page *page, unsigned long section)
937 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
938 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
941 static inline unsigned long page_to_section(const struct page *page)
943 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
947 static inline void set_page_zone(struct page *page, enum zone_type zone)
949 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
950 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
953 static inline void set_page_node(struct page *page, unsigned long node)
955 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
956 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
959 static inline void set_page_links(struct page *page, enum zone_type zone,
960 unsigned long node, unsigned long pfn)
962 set_page_zone(page, zone);
963 set_page_node(page, node);
964 #ifdef SECTION_IN_PAGE_FLAGS
965 set_page_section(page, pfn_to_section_nr(pfn));
970 * Some inline functions in vmstat.h depend on page_zone()
972 #include <linux/vmstat.h>
974 static __always_inline void *lowmem_page_address(const struct page *page)
976 return __va(PFN_PHYS(page_to_pfn(page)));
979 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
980 #define HASHED_PAGE_VIRTUAL
983 #if defined(WANT_PAGE_VIRTUAL)
984 static inline void *page_address(const struct page *page)
986 return page->virtual;
988 static inline void set_page_address(struct page *page, void *address)
990 page->virtual = address;
992 #define page_address_init() do { } while(0)
995 #if defined(HASHED_PAGE_VIRTUAL)
996 void *page_address(const struct page *page);
997 void set_page_address(struct page *page, void *virtual);
998 void page_address_init(void);
1001 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
1002 #define page_address(page) lowmem_page_address(page)
1003 #define set_page_address(page, address) do { } while(0)
1004 #define page_address_init() do { } while(0)
1008 * On an anonymous page mapped into a user virtual memory area,
1009 * page->mapping points to its anon_vma, not to a struct address_space;
1010 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
1012 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
1013 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
1014 * and then page->mapping points, not to an anon_vma, but to a private
1015 * structure which KSM associates with that merged page. See ksm.h.
1017 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
1019 * Please note that, confusingly, "page_mapping" refers to the inode
1020 * address_space which maps the page from disk; whereas "page_mapped"
1021 * refers to user virtual address space into which the page is mapped.
1023 #define PAGE_MAPPING_ANON 1
1024 #define PAGE_MAPPING_KSM 2
1025 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
1027 extern struct address_space *page_mapping(struct page *page);
1029 /* Neutral page->mapping pointer to address_space or anon_vma or other */
1030 static inline void *page_rmapping(struct page *page)
1032 return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
1035 extern struct address_space *__page_file_mapping(struct page *);
1038 struct address_space *page_file_mapping(struct page *page)
1040 if (unlikely(PageSwapCache(page)))
1041 return __page_file_mapping(page);
1043 return page->mapping;
1046 static inline int PageAnon(struct page *page)
1048 return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
1052 * Return the pagecache index of the passed page. Regular pagecache pages
1053 * use ->index whereas swapcache pages use ->private
1055 static inline pgoff_t page_index(struct page *page)
1057 if (unlikely(PageSwapCache(page)))
1058 return page_private(page);
1062 extern pgoff_t __page_file_index(struct page *page);
1065 * Return the file index of the page. Regular pagecache pages use ->index
1066 * whereas swapcache pages use swp_offset(->private)
1068 static inline pgoff_t page_file_index(struct page *page)
1070 if (unlikely(PageSwapCache(page)))
1071 return __page_file_index(page);
1077 * Return true if this page is mapped into pagetables.
1079 static inline int page_mapped(struct page *page)
1081 return atomic_read(&(page)->_mapcount) >= 0;
1085 * Different kinds of faults, as returned by handle_mm_fault().
1086 * Used to decide whether a process gets delivered SIGBUS or
1087 * just gets major/minor fault counters bumped up.
1090 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1092 #define VM_FAULT_OOM 0x0001
1093 #define VM_FAULT_SIGBUS 0x0002
1094 #define VM_FAULT_MAJOR 0x0004
1095 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1096 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1097 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1098 #define VM_FAULT_SIGSEGV 0x0040
1100 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1101 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1102 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1103 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1105 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1107 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1108 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1111 /* Encode hstate index for a hwpoisoned large page */
1112 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1113 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1116 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1118 extern void pagefault_out_of_memory(void);
1120 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1123 * Flags passed to show_mem() and show_free_areas() to suppress output in
1126 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1128 extern void show_free_areas(unsigned int flags);
1129 extern bool skip_free_areas_node(unsigned int flags, int nid);
1131 int shmem_zero_setup(struct vm_area_struct *);
1133 bool shmem_mapping(struct address_space *mapping);
1135 static inline bool shmem_mapping(struct address_space *mapping)
1141 extern int can_do_mlock(void);
1142 extern int user_shm_lock(size_t, struct user_struct *);
1143 extern void user_shm_unlock(size_t, struct user_struct *);
1146 * Parameter block passed down to zap_pte_range in exceptional cases.
1148 struct zap_details {
1149 struct address_space *check_mapping; /* Check page->mapping if set */
1150 pgoff_t first_index; /* Lowest page->index to unmap */
1151 pgoff_t last_index; /* Highest page->index to unmap */
1154 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
1157 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1158 unsigned long size);
1159 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
1160 unsigned long size, struct zap_details *);
1161 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
1162 unsigned long start, unsigned long end);
1165 * mm_walk - callbacks for walk_page_range
1166 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
1167 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1168 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1169 * this handler is required to be able to handle
1170 * pmd_trans_huge() pmds. They may simply choose to
1171 * split_huge_page() instead of handling it explicitly.
1172 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1173 * @pte_hole: if set, called for each hole at all levels
1174 * @hugetlb_entry: if set, called for each hugetlb entry
1175 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
1178 * (see walk_page_range for more details)
1181 int (*pgd_entry)(pgd_t *pgd, unsigned long addr,
1182 unsigned long next, struct mm_walk *walk);
1183 int (*pud_entry)(pud_t *pud, unsigned long addr,
1184 unsigned long next, struct mm_walk *walk);
1185 int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1186 unsigned long next, struct mm_walk *walk);
1187 int (*pte_entry)(pte_t *pte, unsigned long addr,
1188 unsigned long next, struct mm_walk *walk);
1189 int (*pte_hole)(unsigned long addr, unsigned long next,
1190 struct mm_walk *walk);
1191 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1192 unsigned long addr, unsigned long next,
1193 struct mm_walk *walk);
1194 struct mm_struct *mm;
1198 int walk_page_range(unsigned long addr, unsigned long end,
1199 struct mm_walk *walk);
1200 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1201 unsigned long end, unsigned long floor, unsigned long ceiling);
1202 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1203 struct vm_area_struct *vma);
1204 void unmap_mapping_range(struct address_space *mapping,
1205 loff_t const holebegin, loff_t const holelen, int even_cows);
1206 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1207 unsigned long *pfn);
1208 int follow_phys(struct vm_area_struct *vma, unsigned long address,
1209 unsigned int flags, unsigned long *prot, resource_size_t *phys);
1210 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1211 void *buf, int len, int write);
1213 static inline void unmap_shared_mapping_range(struct address_space *mapping,
1214 loff_t const holebegin, loff_t const holelen)
1216 unmap_mapping_range(mapping, holebegin, holelen, 0);
1219 extern void truncate_pagecache(struct inode *inode, loff_t new);
1220 extern void truncate_setsize(struct inode *inode, loff_t newsize);
1221 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
1222 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1223 int truncate_inode_page(struct address_space *mapping, struct page *page);
1224 int generic_error_remove_page(struct address_space *mapping, struct page *page);
1225 int invalidate_inode_page(struct page *page);
1228 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
1229 unsigned long address, unsigned int flags);
1230 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1231 unsigned long address, unsigned int fault_flags);
1233 static inline int handle_mm_fault(struct mm_struct *mm,
1234 struct vm_area_struct *vma, unsigned long address,
1237 /* should never happen if there's no MMU */
1239 return VM_FAULT_SIGBUS;
1241 static inline int fixup_user_fault(struct task_struct *tsk,
1242 struct mm_struct *mm, unsigned long address,
1243 unsigned int fault_flags)
1245 /* should never happen if there's no MMU */
1251 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
1252 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1253 void *buf, int len, int write);
1255 long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1256 unsigned long start, unsigned long nr_pages,
1257 unsigned int foll_flags, struct page **pages,
1258 struct vm_area_struct **vmas, int *nonblocking);
1259 long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1260 unsigned long start, unsigned long nr_pages,
1261 int write, int force, struct page **pages,
1262 struct vm_area_struct **vmas);
1263 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1264 struct page **pages);
1266 int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1267 struct page **pages);
1268 int get_kernel_page(unsigned long start, int write, struct page **pages);
1269 struct page *get_dump_page(unsigned long addr);
1271 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1272 extern void do_invalidatepage(struct page *page, unsigned int offset,
1273 unsigned int length);
1275 int __set_page_dirty_nobuffers(struct page *page);
1276 int __set_page_dirty_no_writeback(struct page *page);
1277 int redirty_page_for_writepage(struct writeback_control *wbc,
1279 void account_page_dirtied(struct page *page, struct address_space *mapping);
1280 int set_page_dirty(struct page *page);
1281 int set_page_dirty_lock(struct page *page);
1282 int clear_page_dirty_for_io(struct page *page);
1283 int get_cmdline(struct task_struct *task, char *buffer, int buflen);
1285 /* Is the vma a continuation of the stack vma above it? */
1286 static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1288 return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
1291 static inline int stack_guard_page_start(struct vm_area_struct *vma,
1294 return (vma->vm_flags & VM_GROWSDOWN) &&
1295 (vma->vm_start == addr) &&
1296 !vma_growsdown(vma->vm_prev, addr);
1299 /* Is the vma a continuation of the stack vma below it? */
1300 static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
1302 return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
1305 static inline int stack_guard_page_end(struct vm_area_struct *vma,
1308 return (vma->vm_flags & VM_GROWSUP) &&
1309 (vma->vm_end == addr) &&
1310 !vma_growsup(vma->vm_next, addr);
1313 extern struct task_struct *task_of_stack(struct task_struct *task,
1314 struct vm_area_struct *vma, bool in_group);
1316 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1317 unsigned long old_addr, struct vm_area_struct *new_vma,
1318 unsigned long new_addr, unsigned long len,
1319 bool need_rmap_locks);
1320 extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1321 unsigned long end, pgprot_t newprot,
1322 int dirty_accountable, int prot_numa);
1323 extern int mprotect_fixup(struct vm_area_struct *vma,
1324 struct vm_area_struct **pprev, unsigned long start,
1325 unsigned long end, unsigned long newflags);
1328 * doesn't attempt to fault and will return short.
1330 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1331 struct page **pages);
1333 * per-process(per-mm_struct) statistics.
1335 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1337 long val = atomic_long_read(&mm->rss_stat.count[member]);
1339 #ifdef SPLIT_RSS_COUNTING
1341 * counter is updated in asynchronous manner and may go to minus.
1342 * But it's never be expected number for users.
1347 return (unsigned long)val;
1350 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1352 atomic_long_add(value, &mm->rss_stat.count[member]);
1355 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1357 atomic_long_inc(&mm->rss_stat.count[member]);
1360 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1362 atomic_long_dec(&mm->rss_stat.count[member]);
1365 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1367 return get_mm_counter(mm, MM_FILEPAGES) +
1368 get_mm_counter(mm, MM_ANONPAGES);
1371 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1373 return max(mm->hiwater_rss, get_mm_rss(mm));
1376 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1378 return max(mm->hiwater_vm, mm->total_vm);
1381 static inline void update_hiwater_rss(struct mm_struct *mm)
1383 unsigned long _rss = get_mm_rss(mm);
1385 if ((mm)->hiwater_rss < _rss)
1386 (mm)->hiwater_rss = _rss;
1389 static inline void update_hiwater_vm(struct mm_struct *mm)
1391 if (mm->hiwater_vm < mm->total_vm)
1392 mm->hiwater_vm = mm->total_vm;
1395 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1396 struct mm_struct *mm)
1398 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1400 if (*maxrss < hiwater_rss)
1401 *maxrss = hiwater_rss;
1404 #if defined(SPLIT_RSS_COUNTING)
1405 void sync_mm_rss(struct mm_struct *mm);
1407 static inline void sync_mm_rss(struct mm_struct *mm)
1412 int vma_wants_writenotify(struct vm_area_struct *vma);
1414 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1416 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1420 __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1424 #ifdef __PAGETABLE_PUD_FOLDED
1425 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1426 unsigned long address)
1431 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1434 #ifdef __PAGETABLE_PMD_FOLDED
1435 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1436 unsigned long address)
1441 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1444 int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1445 pmd_t *pmd, unsigned long address);
1446 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1449 * The following ifdef needed to get the 4level-fixup.h header to work.
1450 * Remove it when 4level-fixup.h has been removed.
1452 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1453 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1455 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1456 NULL: pud_offset(pgd, address);
1459 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1461 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1462 NULL: pmd_offset(pud, address);
1464 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1466 #if USE_SPLIT_PTE_PTLOCKS
1467 #if ALLOC_SPLIT_PTLOCKS
1468 void __init ptlock_cache_init(void);
1469 extern bool ptlock_alloc(struct page *page);
1470 extern void ptlock_free(struct page *page);
1472 static inline spinlock_t *ptlock_ptr(struct page *page)
1476 #else /* ALLOC_SPLIT_PTLOCKS */
1477 static inline void ptlock_cache_init(void)
1481 static inline bool ptlock_alloc(struct page *page)
1486 static inline void ptlock_free(struct page *page)
1490 static inline spinlock_t *ptlock_ptr(struct page *page)
1494 #endif /* ALLOC_SPLIT_PTLOCKS */
1496 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1498 return ptlock_ptr(pmd_page(*pmd));
1501 static inline bool ptlock_init(struct page *page)
1504 * prep_new_page() initialize page->private (and therefore page->ptl)
1505 * with 0. Make sure nobody took it in use in between.
1507 * It can happen if arch try to use slab for page table allocation:
1508 * slab code uses page->slab_cache and page->first_page (for tail
1509 * pages), which share storage with page->ptl.
1511 VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
1512 if (!ptlock_alloc(page))
1514 spin_lock_init(ptlock_ptr(page));
1518 /* Reset page->mapping so free_pages_check won't complain. */
1519 static inline void pte_lock_deinit(struct page *page)
1521 page->mapping = NULL;
1525 #else /* !USE_SPLIT_PTE_PTLOCKS */
1527 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1529 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1531 return &mm->page_table_lock;
1533 static inline void ptlock_cache_init(void) {}
1534 static inline bool ptlock_init(struct page *page) { return true; }
1535 static inline void pte_lock_deinit(struct page *page) {}
1536 #endif /* USE_SPLIT_PTE_PTLOCKS */
1538 static inline void pgtable_init(void)
1540 ptlock_cache_init();
1541 pgtable_cache_init();
1544 static inline bool pgtable_page_ctor(struct page *page)
1546 inc_zone_page_state(page, NR_PAGETABLE);
1547 return ptlock_init(page);
1550 static inline void pgtable_page_dtor(struct page *page)
1552 pte_lock_deinit(page);
1553 dec_zone_page_state(page, NR_PAGETABLE);
1556 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1558 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1559 pte_t *__pte = pte_offset_map(pmd, address); \
1565 #define pte_unmap_unlock(pte, ptl) do { \
1570 #define pte_alloc_map(mm, vma, pmd, address) \
1571 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1573 NULL: pte_offset_map(pmd, address))
1575 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1576 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1578 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1580 #define pte_alloc_kernel(pmd, address) \
1581 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1582 NULL: pte_offset_kernel(pmd, address))
1584 #if USE_SPLIT_PMD_PTLOCKS
1586 static struct page *pmd_to_page(pmd_t *pmd)
1588 unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
1589 return virt_to_page((void *)((unsigned long) pmd & mask));
1592 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1594 return ptlock_ptr(pmd_to_page(pmd));
1597 static inline bool pgtable_pmd_page_ctor(struct page *page)
1599 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1600 page->pmd_huge_pte = NULL;
1602 return ptlock_init(page);
1605 static inline void pgtable_pmd_page_dtor(struct page *page)
1607 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1608 VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
1613 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1617 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1619 return &mm->page_table_lock;
1622 static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
1623 static inline void pgtable_pmd_page_dtor(struct page *page) {}
1625 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1629 static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
1631 spinlock_t *ptl = pmd_lockptr(mm, pmd);
1636 extern void free_area_init(unsigned long * zones_size);
1637 extern void free_area_init_node(int nid, unsigned long * zones_size,
1638 unsigned long zone_start_pfn, unsigned long *zholes_size);
1639 extern void free_initmem(void);
1642 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1643 * into the buddy system. The freed pages will be poisoned with pattern
1644 * "poison" if it's within range [0, UCHAR_MAX].
1645 * Return pages freed into the buddy system.
1647 extern unsigned long free_reserved_area(void *start, void *end,
1648 int poison, char *s);
1650 #ifdef CONFIG_HIGHMEM
1652 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1653 * and totalram_pages.
1655 extern void free_highmem_page(struct page *page);
1658 extern void adjust_managed_page_count(struct page *page, long count);
1659 extern void mem_init_print_info(const char *str);
1661 /* Free the reserved page into the buddy system, so it gets managed. */
1662 static inline void __free_reserved_page(struct page *page)
1664 ClearPageReserved(page);
1665 init_page_count(page);
1669 static inline void free_reserved_page(struct page *page)
1671 __free_reserved_page(page);
1672 adjust_managed_page_count(page, 1);
1675 static inline void mark_page_reserved(struct page *page)
1677 SetPageReserved(page);
1678 adjust_managed_page_count(page, -1);
1682 * Default method to free all the __init memory into the buddy system.
1683 * The freed pages will be poisoned with pattern "poison" if it's within
1684 * range [0, UCHAR_MAX].
1685 * Return pages freed into the buddy system.
1687 static inline unsigned long free_initmem_default(int poison)
1689 extern char __init_begin[], __init_end[];
1691 return free_reserved_area(&__init_begin, &__init_end,
1692 poison, "unused kernel");
1695 static inline unsigned long get_num_physpages(void)
1698 unsigned long phys_pages = 0;
1700 for_each_online_node(nid)
1701 phys_pages += node_present_pages(nid);
1706 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1708 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1709 * zones, allocate the backing mem_map and account for memory holes in a more
1710 * architecture independent manner. This is a substitute for creating the
1711 * zone_sizes[] and zholes_size[] arrays and passing them to
1712 * free_area_init_node()
1714 * An architecture is expected to register range of page frames backed by
1715 * physical memory with memblock_add[_node]() before calling
1716 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1717 * usage, an architecture is expected to do something like
1719 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1721 * for_each_valid_physical_page_range()
1722 * memblock_add_node(base, size, nid)
1723 * free_area_init_nodes(max_zone_pfns);
1725 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1726 * registered physical page range. Similarly
1727 * sparse_memory_present_with_active_regions() calls memory_present() for
1728 * each range when SPARSEMEM is enabled.
1730 * See mm/page_alloc.c for more information on each function exposed by
1731 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1733 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1734 unsigned long node_map_pfn_alignment(void);
1735 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1736 unsigned long end_pfn);
1737 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1738 unsigned long end_pfn);
1739 extern void get_pfn_range_for_nid(unsigned int nid,
1740 unsigned long *start_pfn, unsigned long *end_pfn);
1741 extern unsigned long find_min_pfn_with_active_regions(void);
1742 extern void free_bootmem_with_active_regions(int nid,
1743 unsigned long max_low_pfn);
1744 extern void sparse_memory_present_with_active_regions(int nid);
1746 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1748 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1749 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1750 static inline int __early_pfn_to_nid(unsigned long pfn)
1755 /* please see mm/page_alloc.c */
1756 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1757 /* there is a per-arch backend function. */
1758 extern int __meminit __early_pfn_to_nid(unsigned long pfn);
1761 extern void set_dma_reserve(unsigned long new_dma_reserve);
1762 extern void memmap_init_zone(unsigned long, int, unsigned long,
1763 unsigned long, enum memmap_context);
1764 extern void setup_per_zone_wmarks(void);
1765 extern int __meminit init_per_zone_wmark_min(void);
1766 extern void mem_init(void);
1767 extern void __init mmap_init(void);
1768 extern void show_mem(unsigned int flags);
1769 extern void si_meminfo(struct sysinfo * val);
1770 extern void si_meminfo_node(struct sysinfo *val, int nid);
1772 extern __printf(3, 4)
1773 void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
1775 extern void setup_per_cpu_pageset(void);
1777 extern void zone_pcp_update(struct zone *zone);
1778 extern void zone_pcp_reset(struct zone *zone);
1781 extern int min_free_kbytes;
1784 extern atomic_long_t mmap_pages_allocated;
1785 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1787 /* interval_tree.c */
1788 void vma_interval_tree_insert(struct vm_area_struct *node,
1789 struct rb_root *root);
1790 void vma_interval_tree_insert_after(struct vm_area_struct *node,
1791 struct vm_area_struct *prev,
1792 struct rb_root *root);
1793 void vma_interval_tree_remove(struct vm_area_struct *node,
1794 struct rb_root *root);
1795 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1796 unsigned long start, unsigned long last);
1797 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1798 unsigned long start, unsigned long last);
1800 #define vma_interval_tree_foreach(vma, root, start, last) \
1801 for (vma = vma_interval_tree_iter_first(root, start, last); \
1802 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1804 static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
1805 struct list_head *list)
1807 list_add_tail(&vma->shared.nonlinear, list);
1810 void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1811 struct rb_root *root);
1812 void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1813 struct rb_root *root);
1814 struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1815 struct rb_root *root, unsigned long start, unsigned long last);
1816 struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1817 struct anon_vma_chain *node, unsigned long start, unsigned long last);
1818 #ifdef CONFIG_DEBUG_VM_RB
1819 void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1822 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1823 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1824 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1827 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1828 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1829 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1830 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1831 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1832 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1833 struct mempolicy *);
1834 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1835 extern int split_vma(struct mm_struct *,
1836 struct vm_area_struct *, unsigned long addr, int new_below);
1837 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1838 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1839 struct rb_node **, struct rb_node *);
1840 extern void unlink_file_vma(struct vm_area_struct *);
1841 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1842 unsigned long addr, unsigned long len, pgoff_t pgoff,
1843 bool *need_rmap_locks);
1844 extern void exit_mmap(struct mm_struct *);
1846 static inline int check_data_rlimit(unsigned long rlim,
1848 unsigned long start,
1849 unsigned long end_data,
1850 unsigned long start_data)
1852 if (rlim < RLIM_INFINITY) {
1853 if (((new - start) + (end_data - start_data)) > rlim)
1860 extern int mm_take_all_locks(struct mm_struct *mm);
1861 extern void mm_drop_all_locks(struct mm_struct *mm);
1863 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1864 extern struct file *get_mm_exe_file(struct mm_struct *mm);
1866 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1867 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
1868 unsigned long addr, unsigned long len,
1869 unsigned long flags,
1870 const struct vm_special_mapping *spec);
1871 /* This is an obsolete alternative to _install_special_mapping. */
1872 extern int install_special_mapping(struct mm_struct *mm,
1873 unsigned long addr, unsigned long len,
1874 unsigned long flags, struct page **pages);
1876 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1878 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1879 unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
1880 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1881 unsigned long len, unsigned long prot, unsigned long flags,
1882 unsigned long pgoff, unsigned long *populate);
1883 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1886 extern int __mm_populate(unsigned long addr, unsigned long len,
1888 static inline void mm_populate(unsigned long addr, unsigned long len)
1891 (void) __mm_populate(addr, len, 1);
1894 static inline void mm_populate(unsigned long addr, unsigned long len) {}
1897 /* These take the mm semaphore themselves */
1898 extern unsigned long vm_brk(unsigned long, unsigned long);
1899 extern int vm_munmap(unsigned long, size_t);
1900 extern unsigned long vm_mmap(struct file *, unsigned long,
1901 unsigned long, unsigned long,
1902 unsigned long, unsigned long);
1904 struct vm_unmapped_area_info {
1905 #define VM_UNMAPPED_AREA_TOPDOWN 1
1906 unsigned long flags;
1907 unsigned long length;
1908 unsigned long low_limit;
1909 unsigned long high_limit;
1910 unsigned long align_mask;
1911 unsigned long align_offset;
1914 extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
1915 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
1918 * Search for an unmapped address range.
1920 * We are looking for a range that:
1921 * - does not intersect with any VMA;
1922 * - is contained within the [low_limit, high_limit) interval;
1923 * - is at least the desired size.
1924 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1926 static inline unsigned long
1927 vm_unmapped_area(struct vm_unmapped_area_info *info)
1929 if (!(info->flags & VM_UNMAPPED_AREA_TOPDOWN))
1930 return unmapped_area(info);
1932 return unmapped_area_topdown(info);
1936 extern void truncate_inode_pages(struct address_space *, loff_t);
1937 extern void truncate_inode_pages_range(struct address_space *,
1938 loff_t lstart, loff_t lend);
1939 extern void truncate_inode_pages_final(struct address_space *);
1941 /* generic vm_area_ops exported for stackable file systems */
1942 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1943 extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
1944 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1946 /* mm/page-writeback.c */
1947 int write_one_page(struct page *page, int wait);
1948 void task_dirty_inc(struct task_struct *tsk);
1951 #define VM_MAX_READAHEAD 128 /* kbytes */
1952 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1954 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1955 pgoff_t offset, unsigned long nr_to_read);
1957 void page_cache_sync_readahead(struct address_space *mapping,
1958 struct file_ra_state *ra,
1961 unsigned long size);
1963 void page_cache_async_readahead(struct address_space *mapping,
1964 struct file_ra_state *ra,
1968 unsigned long size);
1970 unsigned long max_sane_readahead(unsigned long nr);
1972 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1973 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1975 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1976 extern int expand_downwards(struct vm_area_struct *vma,
1977 unsigned long address);
1979 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1981 #define expand_upwards(vma, address) (0)
1984 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1985 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1986 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1987 struct vm_area_struct **pprev);
1989 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1990 NULL if none. Assume start_addr < end_addr. */
1991 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1993 struct vm_area_struct * vma = find_vma(mm,start_addr);
1995 if (vma && end_addr <= vma->vm_start)
2000 static inline unsigned long vma_pages(struct vm_area_struct *vma)
2002 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
2005 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2006 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
2007 unsigned long vm_start, unsigned long vm_end)
2009 struct vm_area_struct *vma = find_vma(mm, vm_start);
2011 if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
2018 pgprot_t vm_get_page_prot(unsigned long vm_flags);
2019 void vma_set_page_prot(struct vm_area_struct *vma);
2021 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
2025 static inline void vma_set_page_prot(struct vm_area_struct *vma)
2027 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
2031 #ifdef CONFIG_NUMA_BALANCING
2032 unsigned long change_prot_numa(struct vm_area_struct *vma,
2033 unsigned long start, unsigned long end);
2036 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
2037 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
2038 unsigned long pfn, unsigned long size, pgprot_t);
2039 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
2040 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
2042 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
2044 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
2047 struct page *follow_page_mask(struct vm_area_struct *vma,
2048 unsigned long address, unsigned int foll_flags,
2049 unsigned int *page_mask);
2051 static inline struct page *follow_page(struct vm_area_struct *vma,
2052 unsigned long address, unsigned int foll_flags)
2054 unsigned int unused_page_mask;
2055 return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
2058 #define FOLL_WRITE 0x01 /* check pte is writable */
2059 #define FOLL_TOUCH 0x02 /* mark page accessed */
2060 #define FOLL_GET 0x04 /* do get_page on page */
2061 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2062 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2063 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2064 * and return without waiting upon it */
2065 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
2066 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2067 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2068 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2069 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2070 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2072 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
2074 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
2075 unsigned long size, pte_fn_t fn, void *data);
2077 #ifdef CONFIG_PROC_FS
2078 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
2080 static inline void vm_stat_account(struct mm_struct *mm,
2081 unsigned long flags, struct file *file, long pages)
2083 mm->total_vm += pages;
2085 #endif /* CONFIG_PROC_FS */
2087 #ifdef CONFIG_DEBUG_PAGEALLOC
2088 extern bool _debug_pagealloc_enabled;
2089 extern void __kernel_map_pages(struct page *page, int numpages, int enable);
2091 static inline bool debug_pagealloc_enabled(void)
2093 return _debug_pagealloc_enabled;
2097 kernel_map_pages(struct page *page, int numpages, int enable)
2099 if (!debug_pagealloc_enabled())
2102 __kernel_map_pages(page, numpages, enable);
2104 #ifdef CONFIG_HIBERNATION
2105 extern bool kernel_page_present(struct page *page);
2106 #endif /* CONFIG_HIBERNATION */
2109 kernel_map_pages(struct page *page, int numpages, int enable) {}
2110 #ifdef CONFIG_HIBERNATION
2111 static inline bool kernel_page_present(struct page *page) { return true; }
2112 #endif /* CONFIG_HIBERNATION */
2115 #ifdef __HAVE_ARCH_GATE_AREA
2116 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
2117 extern int in_gate_area_no_mm(unsigned long addr);
2118 extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
2120 static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
2124 static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
2125 static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
2129 #endif /* __HAVE_ARCH_GATE_AREA */
2131 #ifdef CONFIG_SYSCTL
2132 extern int sysctl_drop_caches;
2133 int drop_caches_sysctl_handler(struct ctl_table *, int,
2134 void __user *, size_t *, loff_t *);
2137 unsigned long shrink_node_slabs(gfp_t gfp_mask, int nid,
2138 unsigned long nr_scanned,
2139 unsigned long nr_eligible);
2142 #define randomize_va_space 0
2144 extern int randomize_va_space;
2147 const char * arch_vma_name(struct vm_area_struct *vma);
2148 void print_vma_addr(char *prefix, unsigned long rip);
2150 void sparse_mem_maps_populate_node(struct page **map_map,
2151 unsigned long pnum_begin,
2152 unsigned long pnum_end,
2153 unsigned long map_count,
2156 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
2157 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
2158 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
2159 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
2160 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
2161 void *vmemmap_alloc_block(unsigned long size, int node);
2162 void *vmemmap_alloc_block_buf(unsigned long size, int node);
2163 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
2164 int vmemmap_populate_basepages(unsigned long start, unsigned long end,
2166 int vmemmap_populate(unsigned long start, unsigned long end, int node);
2167 void vmemmap_populate_print_last(void);
2168 #ifdef CONFIG_MEMORY_HOTPLUG
2169 void vmemmap_free(unsigned long start, unsigned long end);
2171 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
2172 unsigned long size);
2175 MF_COUNT_INCREASED = 1 << 0,
2176 MF_ACTION_REQUIRED = 1 << 1,
2177 MF_MUST_KILL = 1 << 2,
2178 MF_SOFT_OFFLINE = 1 << 3,
2180 extern int memory_failure(unsigned long pfn, int trapno, int flags);
2181 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
2182 extern int unpoison_memory(unsigned long pfn);
2183 extern int sysctl_memory_failure_early_kill;
2184 extern int sysctl_memory_failure_recovery;
2185 extern void shake_page(struct page *p, int access);
2186 extern atomic_long_t num_poisoned_pages;
2187 extern int soft_offline_page(struct page *page, int flags);
2189 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2190 extern void clear_huge_page(struct page *page,
2192 unsigned int pages_per_huge_page);
2193 extern void copy_user_huge_page(struct page *dst, struct page *src,
2194 unsigned long addr, struct vm_area_struct *vma,
2195 unsigned int pages_per_huge_page);
2196 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2198 extern struct page_ext_operations debug_guardpage_ops;
2199 extern struct page_ext_operations page_poisoning_ops;
2201 #ifdef CONFIG_DEBUG_PAGEALLOC
2202 extern unsigned int _debug_guardpage_minorder;
2203 extern bool _debug_guardpage_enabled;
2205 static inline unsigned int debug_guardpage_minorder(void)
2207 return _debug_guardpage_minorder;
2210 static inline bool debug_guardpage_enabled(void)
2212 return _debug_guardpage_enabled;
2215 static inline bool page_is_guard(struct page *page)
2217 struct page_ext *page_ext;
2219 if (!debug_guardpage_enabled())
2222 page_ext = lookup_page_ext(page);
2223 return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
2226 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2227 static inline bool debug_guardpage_enabled(void) { return false; }
2228 static inline bool page_is_guard(struct page *page) { return false; }
2229 #endif /* CONFIG_DEBUG_PAGEALLOC */
2231 #if MAX_NUMNODES > 1
2232 void __init setup_nr_node_ids(void);
2234 static inline void setup_nr_node_ids(void) {}
2237 #endif /* __KERNEL__ */
2238 #endif /* _LINUX_MM_H */