4 #include <linux/errno.h>
10 #include <linux/list.h>
11 #include <linux/mmzone.h>
12 #include <linux/rbtree.h>
13 #include <linux/atomic.h>
14 #include <linux/debug_locks.h>
15 #include <linux/mm_types.h>
16 #include <linux/range.h>
17 #include <linux/pfn.h>
18 #include <linux/bit_spinlock.h>
19 #include <linux/shrinker.h>
23 struct anon_vma_chain;
26 struct writeback_control;
28 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
29 extern unsigned long max_mapnr;
31 static inline void set_max_mapnr(unsigned long limit)
36 static inline void set_max_mapnr(unsigned long limit) { }
39 extern unsigned long totalram_pages;
40 extern void * high_memory;
41 extern int page_cluster;
44 extern int sysctl_legacy_va_layout;
46 #define sysctl_legacy_va_layout 0
50 #include <asm/pgtable.h>
51 #include <asm/processor.h>
53 extern unsigned long sysctl_user_reserve_kbytes;
54 extern unsigned long sysctl_admin_reserve_kbytes;
56 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
58 /* to align the pointer to the (next) page boundary */
59 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
61 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
62 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
65 * Linux kernel virtual memory manager primitives.
66 * The idea being to have a "virtual" mm in the same way
67 * we have a virtual fs - giving a cleaner interface to the
68 * mm details, and allowing different kinds of memory mappings
69 * (from shared memory to executable loading to arbitrary
73 extern struct kmem_cache *vm_area_cachep;
76 extern struct rb_root nommu_region_tree;
77 extern struct rw_semaphore nommu_region_sem;
79 extern unsigned int kobjsize(const void *objp);
83 * vm_flags in vm_area_struct, see mm_types.h.
85 #define VM_NONE 0x00000000
87 #define VM_READ 0x00000001 /* currently active flags */
88 #define VM_WRITE 0x00000002
89 #define VM_EXEC 0x00000004
90 #define VM_SHARED 0x00000008
92 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
93 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
94 #define VM_MAYWRITE 0x00000020
95 #define VM_MAYEXEC 0x00000040
96 #define VM_MAYSHARE 0x00000080
98 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
99 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
100 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
102 #define VM_LOCKED 0x00002000
103 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
105 /* Used by sys_madvise() */
106 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
107 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
109 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
110 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
111 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
112 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
113 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
114 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
115 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
116 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
118 #ifdef CONFIG_MEM_SOFT_DIRTY
119 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
121 # define VM_SOFTDIRTY 0
124 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
125 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
126 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
127 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
129 #if defined(CONFIG_X86)
130 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
131 #elif defined(CONFIG_PPC)
132 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
133 #elif defined(CONFIG_PARISC)
134 # define VM_GROWSUP VM_ARCH_1
135 #elif defined(CONFIG_METAG)
136 # define VM_GROWSUP VM_ARCH_1
137 #elif defined(CONFIG_IA64)
138 # define VM_GROWSUP VM_ARCH_1
139 #elif !defined(CONFIG_MMU)
140 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
144 # define VM_GROWSUP VM_NONE
147 /* Bits set in the VMA until the stack is in its final location */
148 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
150 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
151 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
154 #ifdef CONFIG_STACK_GROWSUP
155 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
157 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
161 * Special vmas that are non-mergable, non-mlock()able.
162 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
164 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP)
167 * mapping from the currently active vm_flags protection bits (the
168 * low four bits) to a page protection mask..
170 extern pgprot_t protection_map[16];
172 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
173 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
174 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
175 #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */
176 #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */
177 #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */
178 #define FAULT_FLAG_TRIED 0x40 /* second try */
179 #define FAULT_FLAG_USER 0x80 /* The fault originated in userspace */
182 * vm_fault is filled by the the pagefault handler and passed to the vma's
183 * ->fault function. The vma's ->fault is responsible for returning a bitmask
184 * of VM_FAULT_xxx flags that give details about how the fault was handled.
186 * pgoff should be used in favour of virtual_address, if possible. If pgoff
187 * is used, one may implement ->remap_pages to get nonlinear mapping support.
190 unsigned int flags; /* FAULT_FLAG_xxx flags */
191 pgoff_t pgoff; /* Logical page offset based on vma */
192 void __user *virtual_address; /* Faulting virtual address */
194 struct page *page; /* ->fault handlers should return a
195 * page here, unless VM_FAULT_NOPAGE
196 * is set (which is also implied by
202 * These are the virtual MM functions - opening of an area, closing and
203 * unmapping it (needed to keep files on disk up-to-date etc), pointer
204 * to the functions called when a no-page or a wp-page exception occurs.
206 struct vm_operations_struct {
207 void (*open)(struct vm_area_struct * area);
208 void (*close)(struct vm_area_struct * area);
209 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
211 /* notification that a previously read-only page is about to become
212 * writable, if an error is returned it will cause a SIGBUS */
213 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
215 /* called by access_process_vm when get_user_pages() fails, typically
216 * for use by special VMAs that can switch between memory and hardware
218 int (*access)(struct vm_area_struct *vma, unsigned long addr,
219 void *buf, int len, int write);
222 * set_policy() op must add a reference to any non-NULL @new mempolicy
223 * to hold the policy upon return. Caller should pass NULL @new to
224 * remove a policy and fall back to surrounding context--i.e. do not
225 * install a MPOL_DEFAULT policy, nor the task or system default
228 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
231 * get_policy() op must add reference [mpol_get()] to any policy at
232 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
233 * in mm/mempolicy.c will do this automatically.
234 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
235 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
236 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
237 * must return NULL--i.e., do not "fallback" to task or system default
240 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
242 int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,
243 const nodemask_t *to, unsigned long flags);
245 /* called by sys_remap_file_pages() to populate non-linear mapping */
246 int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr,
247 unsigned long size, pgoff_t pgoff);
253 #define page_private(page) ((page)->private)
254 #define set_page_private(page, v) ((page)->private = (v))
256 /* It's valid only if the page is free path or free_list */
257 static inline void set_freepage_migratetype(struct page *page, int migratetype)
259 page->index = migratetype;
262 /* It's valid only if the page is free path or free_list */
263 static inline int get_freepage_migratetype(struct page *page)
269 * FIXME: take this include out, include page-flags.h in
270 * files which need it (119 of them)
272 #include <linux/page-flags.h>
273 #include <linux/huge_mm.h>
276 * Methods to modify the page usage count.
278 * What counts for a page usage:
279 * - cache mapping (page->mapping)
280 * - private data (page->private)
281 * - page mapped in a task's page tables, each mapping
282 * is counted separately
284 * Also, many kernel routines increase the page count before a critical
285 * routine so they can be sure the page doesn't go away from under them.
289 * Drop a ref, return true if the refcount fell to zero (the page has no users)
291 static inline int put_page_testzero(struct page *page)
293 VM_BUG_ON(atomic_read(&page->_count) == 0);
294 return atomic_dec_and_test(&page->_count);
298 * Try to grab a ref unless the page has a refcount of zero, return false if
301 static inline int get_page_unless_zero(struct page *page)
303 return atomic_inc_not_zero(&page->_count);
306 extern int page_is_ram(unsigned long pfn);
308 /* Support for virtually mapped pages */
309 struct page *vmalloc_to_page(const void *addr);
310 unsigned long vmalloc_to_pfn(const void *addr);
313 * Determine if an address is within the vmalloc range
315 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
316 * is no special casing required.
318 static inline int is_vmalloc_addr(const void *x)
321 unsigned long addr = (unsigned long)x;
323 return addr >= VMALLOC_START && addr < VMALLOC_END;
329 extern int is_vmalloc_or_module_addr(const void *x);
331 static inline int is_vmalloc_or_module_addr(const void *x)
337 static inline void compound_lock(struct page *page)
339 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
340 VM_BUG_ON(PageSlab(page));
341 bit_spin_lock(PG_compound_lock, &page->flags);
345 static inline void compound_unlock(struct page *page)
347 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
348 VM_BUG_ON(PageSlab(page));
349 bit_spin_unlock(PG_compound_lock, &page->flags);
353 static inline unsigned long compound_lock_irqsave(struct page *page)
355 unsigned long uninitialized_var(flags);
356 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
357 local_irq_save(flags);
363 static inline void compound_unlock_irqrestore(struct page *page,
366 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
367 compound_unlock(page);
368 local_irq_restore(flags);
372 static inline struct page *compound_head(struct page *page)
374 if (unlikely(PageTail(page)))
375 return page->first_page;
380 * The atomic page->_mapcount, starts from -1: so that transitions
381 * both from it and to it can be tracked, using atomic_inc_and_test
382 * and atomic_add_negative(-1).
384 static inline void page_mapcount_reset(struct page *page)
386 atomic_set(&(page)->_mapcount, -1);
389 static inline int page_mapcount(struct page *page)
391 return atomic_read(&(page)->_mapcount) + 1;
394 static inline int page_count(struct page *page)
396 return atomic_read(&compound_head(page)->_count);
399 static inline void get_huge_page_tail(struct page *page)
402 * __split_huge_page_refcount() cannot run
405 VM_BUG_ON(page_mapcount(page) < 0);
406 VM_BUG_ON(atomic_read(&page->_count) != 0);
407 atomic_inc(&page->_mapcount);
410 extern bool __get_page_tail(struct page *page);
412 static inline void get_page(struct page *page)
414 if (unlikely(PageTail(page)))
415 if (likely(__get_page_tail(page)))
418 * Getting a normal page or the head of a compound page
419 * requires to already have an elevated page->_count.
421 VM_BUG_ON(atomic_read(&page->_count) <= 0);
422 atomic_inc(&page->_count);
425 static inline struct page *virt_to_head_page(const void *x)
427 struct page *page = virt_to_page(x);
428 return compound_head(page);
432 * Setup the page count before being freed into the page allocator for
433 * the first time (boot or memory hotplug)
435 static inline void init_page_count(struct page *page)
437 atomic_set(&page->_count, 1);
441 * PageBuddy() indicate that the page is free and in the buddy system
442 * (see mm/page_alloc.c).
444 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
445 * -2 so that an underflow of the page_mapcount() won't be mistaken
446 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
447 * efficiently by most CPU architectures.
449 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
451 static inline int PageBuddy(struct page *page)
453 return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE;
456 static inline void __SetPageBuddy(struct page *page)
458 VM_BUG_ON(atomic_read(&page->_mapcount) != -1);
459 atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE);
462 static inline void __ClearPageBuddy(struct page *page)
464 VM_BUG_ON(!PageBuddy(page));
465 atomic_set(&page->_mapcount, -1);
468 void put_page(struct page *page);
469 void put_pages_list(struct list_head *pages);
471 void split_page(struct page *page, unsigned int order);
472 int split_free_page(struct page *page);
475 * Compound pages have a destructor function. Provide a
476 * prototype for that function and accessor functions.
477 * These are _only_ valid on the head of a PG_compound page.
479 typedef void compound_page_dtor(struct page *);
481 static inline void set_compound_page_dtor(struct page *page,
482 compound_page_dtor *dtor)
484 page[1].lru.next = (void *)dtor;
487 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
489 return (compound_page_dtor *)page[1].lru.next;
492 static inline int compound_order(struct page *page)
496 return (unsigned long)page[1].lru.prev;
499 static inline void set_compound_order(struct page *page, unsigned long order)
501 page[1].lru.prev = (void *)order;
506 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
507 * servicing faults for write access. In the normal case, do always want
508 * pte_mkwrite. But get_user_pages can cause write faults for mappings
509 * that do not have writing enabled, when used by access_process_vm.
511 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
513 if (likely(vma->vm_flags & VM_WRITE))
514 pte = pte_mkwrite(pte);
520 * Multiple processes may "see" the same page. E.g. for untouched
521 * mappings of /dev/null, all processes see the same page full of
522 * zeroes, and text pages of executables and shared libraries have
523 * only one copy in memory, at most, normally.
525 * For the non-reserved pages, page_count(page) denotes a reference count.
526 * page_count() == 0 means the page is free. page->lru is then used for
527 * freelist management in the buddy allocator.
528 * page_count() > 0 means the page has been allocated.
530 * Pages are allocated by the slab allocator in order to provide memory
531 * to kmalloc and kmem_cache_alloc. In this case, the management of the
532 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
533 * unless a particular usage is carefully commented. (the responsibility of
534 * freeing the kmalloc memory is the caller's, of course).
536 * A page may be used by anyone else who does a __get_free_page().
537 * In this case, page_count still tracks the references, and should only
538 * be used through the normal accessor functions. The top bits of page->flags
539 * and page->virtual store page management information, but all other fields
540 * are unused and could be used privately, carefully. The management of this
541 * page is the responsibility of the one who allocated it, and those who have
542 * subsequently been given references to it.
544 * The other pages (we may call them "pagecache pages") are completely
545 * managed by the Linux memory manager: I/O, buffers, swapping etc.
546 * The following discussion applies only to them.
548 * A pagecache page contains an opaque `private' member, which belongs to the
549 * page's address_space. Usually, this is the address of a circular list of
550 * the page's disk buffers. PG_private must be set to tell the VM to call
551 * into the filesystem to release these pages.
553 * A page may belong to an inode's memory mapping. In this case, page->mapping
554 * is the pointer to the inode, and page->index is the file offset of the page,
555 * in units of PAGE_CACHE_SIZE.
557 * If pagecache pages are not associated with an inode, they are said to be
558 * anonymous pages. These may become associated with the swapcache, and in that
559 * case PG_swapcache is set, and page->private is an offset into the swapcache.
561 * In either case (swapcache or inode backed), the pagecache itself holds one
562 * reference to the page. Setting PG_private should also increment the
563 * refcount. The each user mapping also has a reference to the page.
565 * The pagecache pages are stored in a per-mapping radix tree, which is
566 * rooted at mapping->page_tree, and indexed by offset.
567 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
568 * lists, we instead now tag pages as dirty/writeback in the radix tree.
570 * All pagecache pages may be subject to I/O:
571 * - inode pages may need to be read from disk,
572 * - inode pages which have been modified and are MAP_SHARED may need
573 * to be written back to the inode on disk,
574 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
575 * modified may need to be swapped out to swap space and (later) to be read
580 * The zone field is never updated after free_area_init_core()
581 * sets it, so none of the operations on it need to be atomic.
584 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
585 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
586 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
587 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
588 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
591 * Define the bit shifts to access each section. For non-existent
592 * sections we define the shift as 0; that plus a 0 mask ensures
593 * the compiler will optimise away reference to them.
595 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
596 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
597 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
598 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
600 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
601 #ifdef NODE_NOT_IN_PAGE_FLAGS
602 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
603 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
604 SECTIONS_PGOFF : ZONES_PGOFF)
606 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
607 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
608 NODES_PGOFF : ZONES_PGOFF)
611 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
613 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
614 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
617 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
618 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
619 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
620 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_WIDTH) - 1)
621 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
623 static inline enum zone_type page_zonenum(const struct page *page)
625 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
628 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
629 #define SECTION_IN_PAGE_FLAGS
633 * The identification function is mainly used by the buddy allocator for
634 * determining if two pages could be buddies. We are not really identifying
635 * the zone since we could be using the section number id if we do not have
636 * node id available in page flags.
637 * We only guarantee that it will return the same value for two combinable
640 static inline int page_zone_id(struct page *page)
642 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
645 static inline int zone_to_nid(struct zone *zone)
654 #ifdef NODE_NOT_IN_PAGE_FLAGS
655 extern int page_to_nid(const struct page *page);
657 static inline int page_to_nid(const struct page *page)
659 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
663 #ifdef CONFIG_NUMA_BALANCING
664 static inline int cpu_pid_to_cpupid(int cpu, int pid)
666 return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
669 static inline int cpupid_to_pid(int cpupid)
671 return cpupid & LAST__PID_MASK;
674 static inline int cpupid_to_cpu(int cpupid)
676 return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
679 static inline int cpupid_to_nid(int cpupid)
681 return cpu_to_node(cpupid_to_cpu(cpupid));
684 static inline bool cpupid_pid_unset(int cpupid)
686 return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
689 static inline bool cpupid_cpu_unset(int cpupid)
691 return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
694 static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
696 return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
699 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
700 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
701 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
703 return xchg(&page->_last_cpupid, cpupid);
706 static inline int page_cpupid_last(struct page *page)
708 return page->_last_cpupid;
710 static inline void page_cpupid_reset_last(struct page *page)
712 page->_last_cpupid = -1;
715 static inline int page_cpupid_last(struct page *page)
717 return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
720 extern int page_cpupid_xchg_last(struct page *page, int cpupid);
722 static inline void page_cpupid_reset_last(struct page *page)
724 int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
726 page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
727 page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
729 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
730 #else /* !CONFIG_NUMA_BALANCING */
731 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
733 return page_to_nid(page); /* XXX */
736 static inline int page_cpupid_last(struct page *page)
738 return page_to_nid(page); /* XXX */
741 static inline int cpupid_to_nid(int cpupid)
746 static inline int cpupid_to_pid(int cpupid)
751 static inline int cpupid_to_cpu(int cpupid)
756 static inline int cpu_pid_to_cpupid(int nid, int pid)
761 static inline bool cpupid_pid_unset(int cpupid)
766 static inline void page_cpupid_reset_last(struct page *page)
770 static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
774 #endif /* CONFIG_NUMA_BALANCING */
776 static inline struct zone *page_zone(const struct page *page)
778 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
781 #ifdef SECTION_IN_PAGE_FLAGS
782 static inline void set_page_section(struct page *page, unsigned long section)
784 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
785 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
788 static inline unsigned long page_to_section(const struct page *page)
790 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
794 static inline void set_page_zone(struct page *page, enum zone_type zone)
796 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
797 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
800 static inline void set_page_node(struct page *page, unsigned long node)
802 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
803 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
806 static inline void set_page_links(struct page *page, enum zone_type zone,
807 unsigned long node, unsigned long pfn)
809 set_page_zone(page, zone);
810 set_page_node(page, node);
811 #ifdef SECTION_IN_PAGE_FLAGS
812 set_page_section(page, pfn_to_section_nr(pfn));
817 * Some inline functions in vmstat.h depend on page_zone()
819 #include <linux/vmstat.h>
821 static __always_inline void *lowmem_page_address(const struct page *page)
823 return __va(PFN_PHYS(page_to_pfn(page)));
826 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
827 #define HASHED_PAGE_VIRTUAL
830 #if defined(WANT_PAGE_VIRTUAL)
831 #define page_address(page) ((page)->virtual)
832 #define set_page_address(page, address) \
834 (page)->virtual = (address); \
836 #define page_address_init() do { } while(0)
839 #if defined(HASHED_PAGE_VIRTUAL)
840 void *page_address(const struct page *page);
841 void set_page_address(struct page *page, void *virtual);
842 void page_address_init(void);
845 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
846 #define page_address(page) lowmem_page_address(page)
847 #define set_page_address(page, address) do { } while(0)
848 #define page_address_init() do { } while(0)
852 * On an anonymous page mapped into a user virtual memory area,
853 * page->mapping points to its anon_vma, not to a struct address_space;
854 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
856 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
857 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
858 * and then page->mapping points, not to an anon_vma, but to a private
859 * structure which KSM associates with that merged page. See ksm.h.
861 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
863 * Please note that, confusingly, "page_mapping" refers to the inode
864 * address_space which maps the page from disk; whereas "page_mapped"
865 * refers to user virtual address space into which the page is mapped.
867 #define PAGE_MAPPING_ANON 1
868 #define PAGE_MAPPING_KSM 2
869 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
871 extern struct address_space *page_mapping(struct page *page);
873 /* Neutral page->mapping pointer to address_space or anon_vma or other */
874 static inline void *page_rmapping(struct page *page)
876 return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
879 extern struct address_space *__page_file_mapping(struct page *);
882 struct address_space *page_file_mapping(struct page *page)
884 if (unlikely(PageSwapCache(page)))
885 return __page_file_mapping(page);
887 return page->mapping;
890 static inline int PageAnon(struct page *page)
892 return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
896 * Return the pagecache index of the passed page. Regular pagecache pages
897 * use ->index whereas swapcache pages use ->private
899 static inline pgoff_t page_index(struct page *page)
901 if (unlikely(PageSwapCache(page)))
902 return page_private(page);
906 extern pgoff_t __page_file_index(struct page *page);
909 * Return the file index of the page. Regular pagecache pages use ->index
910 * whereas swapcache pages use swp_offset(->private)
912 static inline pgoff_t page_file_index(struct page *page)
914 if (unlikely(PageSwapCache(page)))
915 return __page_file_index(page);
921 * Return true if this page is mapped into pagetables.
923 static inline int page_mapped(struct page *page)
925 return atomic_read(&(page)->_mapcount) >= 0;
929 * Different kinds of faults, as returned by handle_mm_fault().
930 * Used to decide whether a process gets delivered SIGBUS or
931 * just gets major/minor fault counters bumped up.
934 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
936 #define VM_FAULT_OOM 0x0001
937 #define VM_FAULT_SIGBUS 0x0002
938 #define VM_FAULT_MAJOR 0x0004
939 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
940 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
941 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
943 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
944 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
945 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
946 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
948 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
950 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
951 VM_FAULT_FALLBACK | VM_FAULT_HWPOISON_LARGE)
953 /* Encode hstate index for a hwpoisoned large page */
954 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
955 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
958 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
960 extern void pagefault_out_of_memory(void);
962 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
965 * Flags passed to show_mem() and show_free_areas() to suppress output in
968 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
969 #define SHOW_MEM_FILTER_PAGE_COUNT (0x0002u) /* page type count */
971 extern void show_free_areas(unsigned int flags);
972 extern bool skip_free_areas_node(unsigned int flags, int nid);
974 int shmem_zero_setup(struct vm_area_struct *);
976 extern int can_do_mlock(void);
977 extern int user_shm_lock(size_t, struct user_struct *);
978 extern void user_shm_unlock(size_t, struct user_struct *);
981 * Parameter block passed down to zap_pte_range in exceptional cases.
984 struct vm_area_struct *nonlinear_vma; /* Check page->index if set */
985 struct address_space *check_mapping; /* Check page->mapping if set */
986 pgoff_t first_index; /* Lowest page->index to unmap */
987 pgoff_t last_index; /* Highest page->index to unmap */
990 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
993 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
995 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
996 unsigned long size, struct zap_details *);
997 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
998 unsigned long start, unsigned long end);
1001 * mm_walk - callbacks for walk_page_range
1002 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
1003 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1004 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1005 * this handler is required to be able to handle
1006 * pmd_trans_huge() pmds. They may simply choose to
1007 * split_huge_page() instead of handling it explicitly.
1008 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1009 * @pte_hole: if set, called for each hole at all levels
1010 * @hugetlb_entry: if set, called for each hugetlb entry
1011 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
1014 * (see walk_page_range for more details)
1017 int (*pgd_entry)(pgd_t *pgd, unsigned long addr,
1018 unsigned long next, struct mm_walk *walk);
1019 int (*pud_entry)(pud_t *pud, unsigned long addr,
1020 unsigned long next, struct mm_walk *walk);
1021 int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1022 unsigned long next, struct mm_walk *walk);
1023 int (*pte_entry)(pte_t *pte, unsigned long addr,
1024 unsigned long next, struct mm_walk *walk);
1025 int (*pte_hole)(unsigned long addr, unsigned long next,
1026 struct mm_walk *walk);
1027 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1028 unsigned long addr, unsigned long next,
1029 struct mm_walk *walk);
1030 struct mm_struct *mm;
1034 int walk_page_range(unsigned long addr, unsigned long end,
1035 struct mm_walk *walk);
1036 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1037 unsigned long end, unsigned long floor, unsigned long ceiling);
1038 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1039 struct vm_area_struct *vma);
1040 void unmap_mapping_range(struct address_space *mapping,
1041 loff_t const holebegin, loff_t const holelen, int even_cows);
1042 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1043 unsigned long *pfn);
1044 int follow_phys(struct vm_area_struct *vma, unsigned long address,
1045 unsigned int flags, unsigned long *prot, resource_size_t *phys);
1046 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1047 void *buf, int len, int write);
1049 static inline void unmap_shared_mapping_range(struct address_space *mapping,
1050 loff_t const holebegin, loff_t const holelen)
1052 unmap_mapping_range(mapping, holebegin, holelen, 0);
1055 extern void truncate_pagecache(struct inode *inode, loff_t new);
1056 extern void truncate_setsize(struct inode *inode, loff_t newsize);
1057 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1058 int truncate_inode_page(struct address_space *mapping, struct page *page);
1059 int generic_error_remove_page(struct address_space *mapping, struct page *page);
1060 int invalidate_inode_page(struct page *page);
1063 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
1064 unsigned long address, unsigned int flags);
1065 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1066 unsigned long address, unsigned int fault_flags);
1068 static inline int handle_mm_fault(struct mm_struct *mm,
1069 struct vm_area_struct *vma, unsigned long address,
1072 /* should never happen if there's no MMU */
1074 return VM_FAULT_SIGBUS;
1076 static inline int fixup_user_fault(struct task_struct *tsk,
1077 struct mm_struct *mm, unsigned long address,
1078 unsigned int fault_flags)
1080 /* should never happen if there's no MMU */
1086 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
1087 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1088 void *buf, int len, int write);
1090 long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1091 unsigned long start, unsigned long nr_pages,
1092 unsigned int foll_flags, struct page **pages,
1093 struct vm_area_struct **vmas, int *nonblocking);
1094 long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1095 unsigned long start, unsigned long nr_pages,
1096 int write, int force, struct page **pages,
1097 struct vm_area_struct **vmas);
1098 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1099 struct page **pages);
1101 int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1102 struct page **pages);
1103 int get_kernel_page(unsigned long start, int write, struct page **pages);
1104 struct page *get_dump_page(unsigned long addr);
1106 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1107 extern void do_invalidatepage(struct page *page, unsigned int offset,
1108 unsigned int length);
1110 int __set_page_dirty_nobuffers(struct page *page);
1111 int __set_page_dirty_no_writeback(struct page *page);
1112 int redirty_page_for_writepage(struct writeback_control *wbc,
1114 void account_page_dirtied(struct page *page, struct address_space *mapping);
1115 void account_page_writeback(struct page *page);
1116 int set_page_dirty(struct page *page);
1117 int set_page_dirty_lock(struct page *page);
1118 int clear_page_dirty_for_io(struct page *page);
1120 /* Is the vma a continuation of the stack vma above it? */
1121 static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1123 return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
1126 static inline int stack_guard_page_start(struct vm_area_struct *vma,
1129 return (vma->vm_flags & VM_GROWSDOWN) &&
1130 (vma->vm_start == addr) &&
1131 !vma_growsdown(vma->vm_prev, addr);
1134 /* Is the vma a continuation of the stack vma below it? */
1135 static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
1137 return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
1140 static inline int stack_guard_page_end(struct vm_area_struct *vma,
1143 return (vma->vm_flags & VM_GROWSUP) &&
1144 (vma->vm_end == addr) &&
1145 !vma_growsup(vma->vm_next, addr);
1149 vm_is_stack(struct task_struct *task, struct vm_area_struct *vma, int in_group);
1151 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1152 unsigned long old_addr, struct vm_area_struct *new_vma,
1153 unsigned long new_addr, unsigned long len,
1154 bool need_rmap_locks);
1155 extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1156 unsigned long end, pgprot_t newprot,
1157 int dirty_accountable, int prot_numa);
1158 extern int mprotect_fixup(struct vm_area_struct *vma,
1159 struct vm_area_struct **pprev, unsigned long start,
1160 unsigned long end, unsigned long newflags);
1163 * doesn't attempt to fault and will return short.
1165 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1166 struct page **pages);
1168 * per-process(per-mm_struct) statistics.
1170 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1172 long val = atomic_long_read(&mm->rss_stat.count[member]);
1174 #ifdef SPLIT_RSS_COUNTING
1176 * counter is updated in asynchronous manner and may go to minus.
1177 * But it's never be expected number for users.
1182 return (unsigned long)val;
1185 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1187 atomic_long_add(value, &mm->rss_stat.count[member]);
1190 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1192 atomic_long_inc(&mm->rss_stat.count[member]);
1195 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1197 atomic_long_dec(&mm->rss_stat.count[member]);
1200 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1202 return get_mm_counter(mm, MM_FILEPAGES) +
1203 get_mm_counter(mm, MM_ANONPAGES);
1206 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1208 return max(mm->hiwater_rss, get_mm_rss(mm));
1211 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1213 return max(mm->hiwater_vm, mm->total_vm);
1216 static inline void update_hiwater_rss(struct mm_struct *mm)
1218 unsigned long _rss = get_mm_rss(mm);
1220 if ((mm)->hiwater_rss < _rss)
1221 (mm)->hiwater_rss = _rss;
1224 static inline void update_hiwater_vm(struct mm_struct *mm)
1226 if (mm->hiwater_vm < mm->total_vm)
1227 mm->hiwater_vm = mm->total_vm;
1230 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1231 struct mm_struct *mm)
1233 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1235 if (*maxrss < hiwater_rss)
1236 *maxrss = hiwater_rss;
1239 #if defined(SPLIT_RSS_COUNTING)
1240 void sync_mm_rss(struct mm_struct *mm);
1242 static inline void sync_mm_rss(struct mm_struct *mm)
1247 int vma_wants_writenotify(struct vm_area_struct *vma);
1249 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1251 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1255 __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1259 #ifdef __PAGETABLE_PUD_FOLDED
1260 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1261 unsigned long address)
1266 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1269 #ifdef __PAGETABLE_PMD_FOLDED
1270 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1271 unsigned long address)
1276 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1279 int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1280 pmd_t *pmd, unsigned long address);
1281 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1284 * The following ifdef needed to get the 4level-fixup.h header to work.
1285 * Remove it when 4level-fixup.h has been removed.
1287 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1288 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1290 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1291 NULL: pud_offset(pgd, address);
1294 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1296 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1297 NULL: pmd_offset(pud, address);
1299 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1301 #if USE_SPLIT_PTLOCKS
1303 * We tuck a spinlock to guard each pagetable page into its struct page,
1304 * at page->private, with BUILD_BUG_ON to make sure that this will not
1305 * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
1306 * When freeing, reset page->mapping so free_pages_check won't complain.
1308 #define __pte_lockptr(page) &((page)->ptl)
1309 #define pte_lock_init(_page) do { \
1310 spin_lock_init(__pte_lockptr(_page)); \
1312 #define pte_lock_deinit(page) ((page)->mapping = NULL)
1313 #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
1314 #else /* !USE_SPLIT_PTLOCKS */
1316 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1318 #define pte_lock_init(page) do {} while (0)
1319 #define pte_lock_deinit(page) do {} while (0)
1320 #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
1321 #endif /* USE_SPLIT_PTLOCKS */
1323 static inline void pgtable_page_ctor(struct page *page)
1325 pte_lock_init(page);
1326 inc_zone_page_state(page, NR_PAGETABLE);
1329 static inline void pgtable_page_dtor(struct page *page)
1331 pte_lock_deinit(page);
1332 dec_zone_page_state(page, NR_PAGETABLE);
1335 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1337 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1338 pte_t *__pte = pte_offset_map(pmd, address); \
1344 #define pte_unmap_unlock(pte, ptl) do { \
1349 #define pte_alloc_map(mm, vma, pmd, address) \
1350 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1352 NULL: pte_offset_map(pmd, address))
1354 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1355 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1357 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1359 #define pte_alloc_kernel(pmd, address) \
1360 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1361 NULL: pte_offset_kernel(pmd, address))
1363 extern void free_area_init(unsigned long * zones_size);
1364 extern void free_area_init_node(int nid, unsigned long * zones_size,
1365 unsigned long zone_start_pfn, unsigned long *zholes_size);
1366 extern void free_initmem(void);
1369 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1370 * into the buddy system. The freed pages will be poisoned with pattern
1371 * "poison" if it's within range [0, UCHAR_MAX].
1372 * Return pages freed into the buddy system.
1374 extern unsigned long free_reserved_area(void *start, void *end,
1375 int poison, char *s);
1377 #ifdef CONFIG_HIGHMEM
1379 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1380 * and totalram_pages.
1382 extern void free_highmem_page(struct page *page);
1385 extern void adjust_managed_page_count(struct page *page, long count);
1386 extern void mem_init_print_info(const char *str);
1388 /* Free the reserved page into the buddy system, so it gets managed. */
1389 static inline void __free_reserved_page(struct page *page)
1391 ClearPageReserved(page);
1392 init_page_count(page);
1396 static inline void free_reserved_page(struct page *page)
1398 __free_reserved_page(page);
1399 adjust_managed_page_count(page, 1);
1402 static inline void mark_page_reserved(struct page *page)
1404 SetPageReserved(page);
1405 adjust_managed_page_count(page, -1);
1409 * Default method to free all the __init memory into the buddy system.
1410 * The freed pages will be poisoned with pattern "poison" if it's within
1411 * range [0, UCHAR_MAX].
1412 * Return pages freed into the buddy system.
1414 static inline unsigned long free_initmem_default(int poison)
1416 extern char __init_begin[], __init_end[];
1418 return free_reserved_area(&__init_begin, &__init_end,
1419 poison, "unused kernel");
1422 static inline unsigned long get_num_physpages(void)
1425 unsigned long phys_pages = 0;
1427 for_each_online_node(nid)
1428 phys_pages += node_present_pages(nid);
1433 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1435 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1436 * zones, allocate the backing mem_map and account for memory holes in a more
1437 * architecture independent manner. This is a substitute for creating the
1438 * zone_sizes[] and zholes_size[] arrays and passing them to
1439 * free_area_init_node()
1441 * An architecture is expected to register range of page frames backed by
1442 * physical memory with memblock_add[_node]() before calling
1443 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1444 * usage, an architecture is expected to do something like
1446 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1448 * for_each_valid_physical_page_range()
1449 * memblock_add_node(base, size, nid)
1450 * free_area_init_nodes(max_zone_pfns);
1452 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1453 * registered physical page range. Similarly
1454 * sparse_memory_present_with_active_regions() calls memory_present() for
1455 * each range when SPARSEMEM is enabled.
1457 * See mm/page_alloc.c for more information on each function exposed by
1458 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1460 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1461 unsigned long node_map_pfn_alignment(void);
1462 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1463 unsigned long end_pfn);
1464 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1465 unsigned long end_pfn);
1466 extern void get_pfn_range_for_nid(unsigned int nid,
1467 unsigned long *start_pfn, unsigned long *end_pfn);
1468 extern unsigned long find_min_pfn_with_active_regions(void);
1469 extern void free_bootmem_with_active_regions(int nid,
1470 unsigned long max_low_pfn);
1471 extern void sparse_memory_present_with_active_regions(int nid);
1473 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1475 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1476 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1477 static inline int __early_pfn_to_nid(unsigned long pfn)
1482 /* please see mm/page_alloc.c */
1483 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1484 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
1485 /* there is a per-arch backend function. */
1486 extern int __meminit __early_pfn_to_nid(unsigned long pfn);
1487 #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
1490 extern void set_dma_reserve(unsigned long new_dma_reserve);
1491 extern void memmap_init_zone(unsigned long, int, unsigned long,
1492 unsigned long, enum memmap_context);
1493 extern void setup_per_zone_wmarks(void);
1494 extern int __meminit init_per_zone_wmark_min(void);
1495 extern void mem_init(void);
1496 extern void __init mmap_init(void);
1497 extern void show_mem(unsigned int flags);
1498 extern void si_meminfo(struct sysinfo * val);
1499 extern void si_meminfo_node(struct sysinfo *val, int nid);
1501 extern __printf(3, 4)
1502 void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
1504 extern void setup_per_cpu_pageset(void);
1506 extern void zone_pcp_update(struct zone *zone);
1507 extern void zone_pcp_reset(struct zone *zone);
1510 extern int min_free_kbytes;
1513 extern atomic_long_t mmap_pages_allocated;
1514 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1516 /* interval_tree.c */
1517 void vma_interval_tree_insert(struct vm_area_struct *node,
1518 struct rb_root *root);
1519 void vma_interval_tree_insert_after(struct vm_area_struct *node,
1520 struct vm_area_struct *prev,
1521 struct rb_root *root);
1522 void vma_interval_tree_remove(struct vm_area_struct *node,
1523 struct rb_root *root);
1524 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1525 unsigned long start, unsigned long last);
1526 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1527 unsigned long start, unsigned long last);
1529 #define vma_interval_tree_foreach(vma, root, start, last) \
1530 for (vma = vma_interval_tree_iter_first(root, start, last); \
1531 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1533 static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
1534 struct list_head *list)
1536 list_add_tail(&vma->shared.nonlinear, list);
1539 void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1540 struct rb_root *root);
1541 void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1542 struct rb_root *root);
1543 struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1544 struct rb_root *root, unsigned long start, unsigned long last);
1545 struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1546 struct anon_vma_chain *node, unsigned long start, unsigned long last);
1547 #ifdef CONFIG_DEBUG_VM_RB
1548 void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1551 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1552 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1553 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1556 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1557 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1558 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1559 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1560 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1561 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1562 struct mempolicy *);
1563 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1564 extern int split_vma(struct mm_struct *,
1565 struct vm_area_struct *, unsigned long addr, int new_below);
1566 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1567 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1568 struct rb_node **, struct rb_node *);
1569 extern void unlink_file_vma(struct vm_area_struct *);
1570 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1571 unsigned long addr, unsigned long len, pgoff_t pgoff,
1572 bool *need_rmap_locks);
1573 extern void exit_mmap(struct mm_struct *);
1575 extern int mm_take_all_locks(struct mm_struct *mm);
1576 extern void mm_drop_all_locks(struct mm_struct *mm);
1578 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1579 extern struct file *get_mm_exe_file(struct mm_struct *mm);
1581 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1582 extern int install_special_mapping(struct mm_struct *mm,
1583 unsigned long addr, unsigned long len,
1584 unsigned long flags, struct page **pages);
1586 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1588 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1589 unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
1590 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1591 unsigned long len, unsigned long prot, unsigned long flags,
1592 unsigned long pgoff, unsigned long *populate);
1593 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1596 extern int __mm_populate(unsigned long addr, unsigned long len,
1598 static inline void mm_populate(unsigned long addr, unsigned long len)
1601 (void) __mm_populate(addr, len, 1);
1604 static inline void mm_populate(unsigned long addr, unsigned long len) {}
1607 /* These take the mm semaphore themselves */
1608 extern unsigned long vm_brk(unsigned long, unsigned long);
1609 extern int vm_munmap(unsigned long, size_t);
1610 extern unsigned long vm_mmap(struct file *, unsigned long,
1611 unsigned long, unsigned long,
1612 unsigned long, unsigned long);
1614 struct vm_unmapped_area_info {
1615 #define VM_UNMAPPED_AREA_TOPDOWN 1
1616 unsigned long flags;
1617 unsigned long length;
1618 unsigned long low_limit;
1619 unsigned long high_limit;
1620 unsigned long align_mask;
1621 unsigned long align_offset;
1624 extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
1625 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
1628 * Search for an unmapped address range.
1630 * We are looking for a range that:
1631 * - does not intersect with any VMA;
1632 * - is contained within the [low_limit, high_limit) interval;
1633 * - is at least the desired size.
1634 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1636 static inline unsigned long
1637 vm_unmapped_area(struct vm_unmapped_area_info *info)
1639 if (!(info->flags & VM_UNMAPPED_AREA_TOPDOWN))
1640 return unmapped_area(info);
1642 return unmapped_area_topdown(info);
1646 extern void truncate_inode_pages(struct address_space *, loff_t);
1647 extern void truncate_inode_pages_range(struct address_space *,
1648 loff_t lstart, loff_t lend);
1650 /* generic vm_area_ops exported for stackable file systems */
1651 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1652 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1654 /* mm/page-writeback.c */
1655 int write_one_page(struct page *page, int wait);
1656 void task_dirty_inc(struct task_struct *tsk);
1659 #define VM_MAX_READAHEAD 128 /* kbytes */
1660 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1662 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1663 pgoff_t offset, unsigned long nr_to_read);
1665 void page_cache_sync_readahead(struct address_space *mapping,
1666 struct file_ra_state *ra,
1669 unsigned long size);
1671 void page_cache_async_readahead(struct address_space *mapping,
1672 struct file_ra_state *ra,
1676 unsigned long size);
1678 unsigned long max_sane_readahead(unsigned long nr);
1679 unsigned long ra_submit(struct file_ra_state *ra,
1680 struct address_space *mapping,
1683 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1684 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1686 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1687 extern int expand_downwards(struct vm_area_struct *vma,
1688 unsigned long address);
1690 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1692 #define expand_upwards(vma, address) do { } while (0)
1695 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1696 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1697 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1698 struct vm_area_struct **pprev);
1700 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1701 NULL if none. Assume start_addr < end_addr. */
1702 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1704 struct vm_area_struct * vma = find_vma(mm,start_addr);
1706 if (vma && end_addr <= vma->vm_start)
1711 static inline unsigned long vma_pages(struct vm_area_struct *vma)
1713 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
1716 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1717 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
1718 unsigned long vm_start, unsigned long vm_end)
1720 struct vm_area_struct *vma = find_vma(mm, vm_start);
1722 if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
1729 pgprot_t vm_get_page_prot(unsigned long vm_flags);
1731 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
1737 #ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
1738 unsigned long change_prot_numa(struct vm_area_struct *vma,
1739 unsigned long start, unsigned long end);
1742 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
1743 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
1744 unsigned long pfn, unsigned long size, pgprot_t);
1745 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
1746 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
1748 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
1750 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
1753 struct page *follow_page_mask(struct vm_area_struct *vma,
1754 unsigned long address, unsigned int foll_flags,
1755 unsigned int *page_mask);
1757 static inline struct page *follow_page(struct vm_area_struct *vma,
1758 unsigned long address, unsigned int foll_flags)
1760 unsigned int unused_page_mask;
1761 return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
1764 #define FOLL_WRITE 0x01 /* check pte is writable */
1765 #define FOLL_TOUCH 0x02 /* mark page accessed */
1766 #define FOLL_GET 0x04 /* do get_page on page */
1767 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1768 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1769 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
1770 * and return without waiting upon it */
1771 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
1772 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
1773 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
1774 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
1775 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
1777 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
1779 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
1780 unsigned long size, pte_fn_t fn, void *data);
1782 #ifdef CONFIG_PROC_FS
1783 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
1785 static inline void vm_stat_account(struct mm_struct *mm,
1786 unsigned long flags, struct file *file, long pages)
1788 mm->total_vm += pages;
1790 #endif /* CONFIG_PROC_FS */
1792 #ifdef CONFIG_DEBUG_PAGEALLOC
1793 extern void kernel_map_pages(struct page *page, int numpages, int enable);
1794 #ifdef CONFIG_HIBERNATION
1795 extern bool kernel_page_present(struct page *page);
1796 #endif /* CONFIG_HIBERNATION */
1799 kernel_map_pages(struct page *page, int numpages, int enable) {}
1800 #ifdef CONFIG_HIBERNATION
1801 static inline bool kernel_page_present(struct page *page) { return true; }
1802 #endif /* CONFIG_HIBERNATION */
1805 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
1806 #ifdef __HAVE_ARCH_GATE_AREA
1807 int in_gate_area_no_mm(unsigned long addr);
1808 int in_gate_area(struct mm_struct *mm, unsigned long addr);
1810 int in_gate_area_no_mm(unsigned long addr);
1811 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
1812 #endif /* __HAVE_ARCH_GATE_AREA */
1814 #ifdef CONFIG_SYSCTL
1815 extern int sysctl_drop_caches;
1816 int drop_caches_sysctl_handler(struct ctl_table *, int,
1817 void __user *, size_t *, loff_t *);
1820 unsigned long shrink_slab(struct shrink_control *shrink,
1821 unsigned long nr_pages_scanned,
1822 unsigned long lru_pages);
1825 #define randomize_va_space 0
1827 extern int randomize_va_space;
1830 const char * arch_vma_name(struct vm_area_struct *vma);
1831 void print_vma_addr(char *prefix, unsigned long rip);
1833 void sparse_mem_maps_populate_node(struct page **map_map,
1834 unsigned long pnum_begin,
1835 unsigned long pnum_end,
1836 unsigned long map_count,
1839 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
1840 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
1841 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
1842 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
1843 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
1844 void *vmemmap_alloc_block(unsigned long size, int node);
1845 void *vmemmap_alloc_block_buf(unsigned long size, int node);
1846 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
1847 int vmemmap_populate_basepages(unsigned long start, unsigned long end,
1849 int vmemmap_populate(unsigned long start, unsigned long end, int node);
1850 void vmemmap_populate_print_last(void);
1851 #ifdef CONFIG_MEMORY_HOTPLUG
1852 void vmemmap_free(unsigned long start, unsigned long end);
1854 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
1855 unsigned long size);
1858 MF_COUNT_INCREASED = 1 << 0,
1859 MF_ACTION_REQUIRED = 1 << 1,
1860 MF_MUST_KILL = 1 << 2,
1861 MF_SOFT_OFFLINE = 1 << 3,
1863 extern int memory_failure(unsigned long pfn, int trapno, int flags);
1864 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
1865 extern int unpoison_memory(unsigned long pfn);
1866 extern int sysctl_memory_failure_early_kill;
1867 extern int sysctl_memory_failure_recovery;
1868 extern void shake_page(struct page *p, int access);
1869 extern atomic_long_t num_poisoned_pages;
1870 extern int soft_offline_page(struct page *page, int flags);
1872 extern void dump_page(struct page *page);
1874 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
1875 extern void clear_huge_page(struct page *page,
1877 unsigned int pages_per_huge_page);
1878 extern void copy_user_huge_page(struct page *dst, struct page *src,
1879 unsigned long addr, struct vm_area_struct *vma,
1880 unsigned int pages_per_huge_page);
1881 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
1883 #ifdef CONFIG_DEBUG_PAGEALLOC
1884 extern unsigned int _debug_guardpage_minorder;
1886 static inline unsigned int debug_guardpage_minorder(void)
1888 return _debug_guardpage_minorder;
1891 static inline bool page_is_guard(struct page *page)
1893 return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags);
1896 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
1897 static inline bool page_is_guard(struct page *page) { return false; }
1898 #endif /* CONFIG_DEBUG_PAGEALLOC */
1900 #if MAX_NUMNODES > 1
1901 void __init setup_nr_node_ids(void);
1903 static inline void setup_nr_node_ids(void) {}
1906 #endif /* __KERNEL__ */
1907 #endif /* _LINUX_MM_H */