4 #include <linux/errno.h>
8 #include <linux/mmdebug.h>
10 #include <linux/bug.h>
11 #include <linux/list.h>
12 #include <linux/mmzone.h>
13 #include <linux/rbtree.h>
14 #include <linux/atomic.h>
15 #include <linux/debug_locks.h>
16 #include <linux/mm_types.h>
17 #include <linux/range.h>
18 #include <linux/pfn.h>
19 #include <linux/bit_spinlock.h>
20 #include <linux/shrinker.h>
21 #include <linux/resource.h>
22 #include <linux/page_ext.h>
26 struct anon_vma_chain;
29 struct writeback_control;
31 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
32 extern unsigned long max_mapnr;
34 static inline void set_max_mapnr(unsigned long limit)
39 static inline void set_max_mapnr(unsigned long limit) { }
42 extern unsigned long totalram_pages;
43 extern void * high_memory;
44 extern int page_cluster;
47 extern int sysctl_legacy_va_layout;
49 #define sysctl_legacy_va_layout 0
53 #include <asm/pgtable.h>
54 #include <asm/processor.h>
57 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
61 * To prevent common memory management code establishing
62 * a zero page mapping on a read fault.
63 * This macro should be defined within <asm/pgtable.h>.
64 * s390 does this to prevent multiplexing of hardware bits
65 * related to the physical page in case of virtualization.
67 #ifndef mm_forbids_zeropage
68 #define mm_forbids_zeropage(X) (0)
71 extern unsigned long sysctl_user_reserve_kbytes;
72 extern unsigned long sysctl_admin_reserve_kbytes;
74 extern int sysctl_overcommit_memory;
75 extern int sysctl_overcommit_ratio;
76 extern unsigned long sysctl_overcommit_kbytes;
78 extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *,
80 extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
83 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
85 /* to align the pointer to the (next) page boundary */
86 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
88 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
89 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
92 * Linux kernel virtual memory manager primitives.
93 * The idea being to have a "virtual" mm in the same way
94 * we have a virtual fs - giving a cleaner interface to the
95 * mm details, and allowing different kinds of memory mappings
96 * (from shared memory to executable loading to arbitrary
100 extern struct kmem_cache *vm_area_cachep;
103 extern struct rb_root nommu_region_tree;
104 extern struct rw_semaphore nommu_region_sem;
106 extern unsigned int kobjsize(const void *objp);
110 * vm_flags in vm_area_struct, see mm_types.h.
112 #define VM_NONE 0x00000000
114 #define VM_READ 0x00000001 /* currently active flags */
115 #define VM_WRITE 0x00000002
116 #define VM_EXEC 0x00000004
117 #define VM_SHARED 0x00000008
119 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
120 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
121 #define VM_MAYWRITE 0x00000020
122 #define VM_MAYEXEC 0x00000040
123 #define VM_MAYSHARE 0x00000080
125 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
126 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
127 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
129 #define VM_LOCKED 0x00002000
130 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
132 /* Used by sys_madvise() */
133 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
134 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
136 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
137 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
138 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
139 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
140 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
141 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
142 #define VM_ARCH_2 0x02000000
143 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
145 #ifdef CONFIG_MEM_SOFT_DIRTY
146 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
148 # define VM_SOFTDIRTY 0
151 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
152 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
153 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
154 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
156 #if defined(CONFIG_X86)
157 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
158 #elif defined(CONFIG_PPC)
159 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
160 #elif defined(CONFIG_PARISC)
161 # define VM_GROWSUP VM_ARCH_1
162 #elif defined(CONFIG_METAG)
163 # define VM_GROWSUP VM_ARCH_1
164 #elif defined(CONFIG_IA64)
165 # define VM_GROWSUP VM_ARCH_1
166 #elif !defined(CONFIG_MMU)
167 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
170 #if defined(CONFIG_X86)
171 /* MPX specific bounds table or bounds directory */
172 # define VM_MPX VM_ARCH_2
176 # define VM_GROWSUP VM_NONE
179 /* Bits set in the VMA until the stack is in its final location */
180 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
182 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
183 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
186 #ifdef CONFIG_STACK_GROWSUP
187 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
189 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
193 * Special vmas that are non-mergable, non-mlock()able.
194 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
196 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
198 /* This mask defines which mm->def_flags a process can inherit its parent */
199 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
202 * mapping from the currently active vm_flags protection bits (the
203 * low four bits) to a page protection mask..
205 extern pgprot_t protection_map[16];
207 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
208 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
209 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
210 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
211 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
212 #define FAULT_FLAG_TRIED 0x20 /* Second try */
213 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
216 * vm_fault is filled by the the pagefault handler and passed to the vma's
217 * ->fault function. The vma's ->fault is responsible for returning a bitmask
218 * of VM_FAULT_xxx flags that give details about how the fault was handled.
220 * pgoff should be used in favour of virtual_address, if possible.
223 unsigned int flags; /* FAULT_FLAG_xxx flags */
224 pgoff_t pgoff; /* Logical page offset based on vma */
225 void __user *virtual_address; /* Faulting virtual address */
227 struct page *cow_page; /* Handler may choose to COW */
228 struct page *page; /* ->fault handlers should return a
229 * page here, unless VM_FAULT_NOPAGE
230 * is set (which is also implied by
233 /* for ->map_pages() only */
234 pgoff_t max_pgoff; /* map pages for offset from pgoff till
235 * max_pgoff inclusive */
236 pte_t *pte; /* pte entry associated with ->pgoff */
240 * These are the virtual MM functions - opening of an area, closing and
241 * unmapping it (needed to keep files on disk up-to-date etc), pointer
242 * to the functions called when a no-page or a wp-page exception occurs.
244 struct vm_operations_struct {
245 void (*open)(struct vm_area_struct * area);
246 void (*close)(struct vm_area_struct * area);
247 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
248 void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
250 /* notification that a previously read-only page is about to become
251 * writable, if an error is returned it will cause a SIGBUS */
252 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
254 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
255 int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
257 /* called by access_process_vm when get_user_pages() fails, typically
258 * for use by special VMAs that can switch between memory and hardware
260 int (*access)(struct vm_area_struct *vma, unsigned long addr,
261 void *buf, int len, int write);
263 /* Called by the /proc/PID/maps code to ask the vma whether it
264 * has a special name. Returning non-NULL will also cause this
265 * vma to be dumped unconditionally. */
266 const char *(*name)(struct vm_area_struct *vma);
270 * set_policy() op must add a reference to any non-NULL @new mempolicy
271 * to hold the policy upon return. Caller should pass NULL @new to
272 * remove a policy and fall back to surrounding context--i.e. do not
273 * install a MPOL_DEFAULT policy, nor the task or system default
276 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
279 * get_policy() op must add reference [mpol_get()] to any policy at
280 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
281 * in mm/mempolicy.c will do this automatically.
282 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
283 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
284 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
285 * must return NULL--i.e., do not "fallback" to task or system default
288 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
292 * Called by vm_normal_page() for special PTEs to find the
293 * page for @addr. This is useful if the default behavior
294 * (using pte_page()) would not find the correct page.
296 struct page *(*find_special_page)(struct vm_area_struct *vma,
303 #define page_private(page) ((page)->private)
304 #define set_page_private(page, v) ((page)->private = (v))
306 /* It's valid only if the page is free path or free_list */
307 static inline void set_freepage_migratetype(struct page *page, int migratetype)
309 page->index = migratetype;
312 /* It's valid only if the page is free path or free_list */
313 static inline int get_freepage_migratetype(struct page *page)
319 * FIXME: take this include out, include page-flags.h in
320 * files which need it (119 of them)
322 #include <linux/page-flags.h>
323 #include <linux/huge_mm.h>
326 * Methods to modify the page usage count.
328 * What counts for a page usage:
329 * - cache mapping (page->mapping)
330 * - private data (page->private)
331 * - page mapped in a task's page tables, each mapping
332 * is counted separately
334 * Also, many kernel routines increase the page count before a critical
335 * routine so they can be sure the page doesn't go away from under them.
339 * Drop a ref, return true if the refcount fell to zero (the page has no users)
341 static inline int put_page_testzero(struct page *page)
343 VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page);
344 return atomic_dec_and_test(&page->_count);
348 * Try to grab a ref unless the page has a refcount of zero, return false if
350 * This can be called when MMU is off so it must not access
351 * any of the virtual mappings.
353 static inline int get_page_unless_zero(struct page *page)
355 return atomic_inc_not_zero(&page->_count);
359 * Try to drop a ref unless the page has a refcount of one, return false if
361 * This is to make sure that the refcount won't become zero after this drop.
362 * This can be called when MMU is off so it must not access
363 * any of the virtual mappings.
365 static inline int put_page_unless_one(struct page *page)
367 return atomic_add_unless(&page->_count, -1, 1);
370 extern int page_is_ram(unsigned long pfn);
371 extern int region_is_ram(resource_size_t phys_addr, unsigned long size);
373 /* Support for virtually mapped pages */
374 struct page *vmalloc_to_page(const void *addr);
375 unsigned long vmalloc_to_pfn(const void *addr);
378 * Determine if an address is within the vmalloc range
380 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
381 * is no special casing required.
383 static inline int is_vmalloc_addr(const void *x)
386 unsigned long addr = (unsigned long)x;
388 return addr >= VMALLOC_START && addr < VMALLOC_END;
394 extern int is_vmalloc_or_module_addr(const void *x);
396 static inline int is_vmalloc_or_module_addr(const void *x)
402 extern void kvfree(const void *addr);
404 static inline void compound_lock(struct page *page)
406 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
407 VM_BUG_ON_PAGE(PageSlab(page), page);
408 bit_spin_lock(PG_compound_lock, &page->flags);
412 static inline void compound_unlock(struct page *page)
414 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
415 VM_BUG_ON_PAGE(PageSlab(page), page);
416 bit_spin_unlock(PG_compound_lock, &page->flags);
420 static inline unsigned long compound_lock_irqsave(struct page *page)
422 unsigned long uninitialized_var(flags);
423 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
424 local_irq_save(flags);
430 static inline void compound_unlock_irqrestore(struct page *page,
433 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
434 compound_unlock(page);
435 local_irq_restore(flags);
439 static inline struct page *compound_head_by_tail(struct page *tail)
441 struct page *head = tail->first_page;
444 * page->first_page may be a dangling pointer to an old
445 * compound page, so recheck that it is still a tail
446 * page before returning.
449 if (likely(PageTail(tail)))
455 * Since either compound page could be dismantled asynchronously in THP
456 * or we access asynchronously arbitrary positioned struct page, there
457 * would be tail flag race. To handle this race, we should call
458 * smp_rmb() before checking tail flag. compound_head_by_tail() did it.
460 static inline struct page *compound_head(struct page *page)
462 if (unlikely(PageTail(page)))
463 return compound_head_by_tail(page);
468 * If we access compound page synchronously such as access to
469 * allocated page, there is no need to handle tail flag race, so we can
470 * check tail flag directly without any synchronization primitive.
472 static inline struct page *compound_head_fast(struct page *page)
474 if (unlikely(PageTail(page)))
475 return page->first_page;
480 * The atomic page->_mapcount, starts from -1: so that transitions
481 * both from it and to it can be tracked, using atomic_inc_and_test
482 * and atomic_add_negative(-1).
484 static inline void page_mapcount_reset(struct page *page)
486 atomic_set(&(page)->_mapcount, -1);
489 static inline int page_mapcount(struct page *page)
491 VM_BUG_ON_PAGE(PageSlab(page), page);
492 return atomic_read(&page->_mapcount) + 1;
495 static inline int page_count(struct page *page)
497 return atomic_read(&compound_head(page)->_count);
500 static inline bool __compound_tail_refcounted(struct page *page)
502 return !PageSlab(page) && !PageHeadHuge(page);
506 * This takes a head page as parameter and tells if the
507 * tail page reference counting can be skipped.
509 * For this to be safe, PageSlab and PageHeadHuge must remain true on
510 * any given page where they return true here, until all tail pins
511 * have been released.
513 static inline bool compound_tail_refcounted(struct page *page)
515 VM_BUG_ON_PAGE(!PageHead(page), page);
516 return __compound_tail_refcounted(page);
519 static inline void get_huge_page_tail(struct page *page)
522 * __split_huge_page_refcount() cannot run from under us.
524 VM_BUG_ON_PAGE(!PageTail(page), page);
525 VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
526 VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page);
527 if (compound_tail_refcounted(page->first_page))
528 atomic_inc(&page->_mapcount);
531 extern bool __get_page_tail(struct page *page);
533 static inline void get_page(struct page *page)
535 if (unlikely(PageTail(page)))
536 if (likely(__get_page_tail(page)))
539 * Getting a normal page or the head of a compound page
540 * requires to already have an elevated page->_count.
542 VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
543 atomic_inc(&page->_count);
546 static inline struct page *virt_to_head_page(const void *x)
548 struct page *page = virt_to_page(x);
551 * We don't need to worry about synchronization of tail flag
552 * when we call virt_to_head_page() since it is only called for
553 * already allocated page and this page won't be freed until
554 * this virt_to_head_page() is finished. So use _fast variant.
556 return compound_head_fast(page);
560 * Setup the page count before being freed into the page allocator for
561 * the first time (boot or memory hotplug)
563 static inline void init_page_count(struct page *page)
565 atomic_set(&page->_count, 1);
568 void put_page(struct page *page);
569 void put_pages_list(struct list_head *pages);
571 void split_page(struct page *page, unsigned int order);
572 int split_free_page(struct page *page);
575 * Compound pages have a destructor function. Provide a
576 * prototype for that function and accessor functions.
577 * These are _only_ valid on the head of a PG_compound page.
580 static inline void set_compound_page_dtor(struct page *page,
581 compound_page_dtor *dtor)
583 page[1].compound_dtor = dtor;
586 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
588 return page[1].compound_dtor;
591 static inline int compound_order(struct page *page)
595 return page[1].compound_order;
598 static inline void set_compound_order(struct page *page, unsigned long order)
600 page[1].compound_order = order;
605 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
606 * servicing faults for write access. In the normal case, do always want
607 * pte_mkwrite. But get_user_pages can cause write faults for mappings
608 * that do not have writing enabled, when used by access_process_vm.
610 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
612 if (likely(vma->vm_flags & VM_WRITE))
613 pte = pte_mkwrite(pte);
617 void do_set_pte(struct vm_area_struct *vma, unsigned long address,
618 struct page *page, pte_t *pte, bool write, bool anon);
622 * Multiple processes may "see" the same page. E.g. for untouched
623 * mappings of /dev/null, all processes see the same page full of
624 * zeroes, and text pages of executables and shared libraries have
625 * only one copy in memory, at most, normally.
627 * For the non-reserved pages, page_count(page) denotes a reference count.
628 * page_count() == 0 means the page is free. page->lru is then used for
629 * freelist management in the buddy allocator.
630 * page_count() > 0 means the page has been allocated.
632 * Pages are allocated by the slab allocator in order to provide memory
633 * to kmalloc and kmem_cache_alloc. In this case, the management of the
634 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
635 * unless a particular usage is carefully commented. (the responsibility of
636 * freeing the kmalloc memory is the caller's, of course).
638 * A page may be used by anyone else who does a __get_free_page().
639 * In this case, page_count still tracks the references, and should only
640 * be used through the normal accessor functions. The top bits of page->flags
641 * and page->virtual store page management information, but all other fields
642 * are unused and could be used privately, carefully. The management of this
643 * page is the responsibility of the one who allocated it, and those who have
644 * subsequently been given references to it.
646 * The other pages (we may call them "pagecache pages") are completely
647 * managed by the Linux memory manager: I/O, buffers, swapping etc.
648 * The following discussion applies only to them.
650 * A pagecache page contains an opaque `private' member, which belongs to the
651 * page's address_space. Usually, this is the address of a circular list of
652 * the page's disk buffers. PG_private must be set to tell the VM to call
653 * into the filesystem to release these pages.
655 * A page may belong to an inode's memory mapping. In this case, page->mapping
656 * is the pointer to the inode, and page->index is the file offset of the page,
657 * in units of PAGE_CACHE_SIZE.
659 * If pagecache pages are not associated with an inode, they are said to be
660 * anonymous pages. These may become associated with the swapcache, and in that
661 * case PG_swapcache is set, and page->private is an offset into the swapcache.
663 * In either case (swapcache or inode backed), the pagecache itself holds one
664 * reference to the page. Setting PG_private should also increment the
665 * refcount. The each user mapping also has a reference to the page.
667 * The pagecache pages are stored in a per-mapping radix tree, which is
668 * rooted at mapping->page_tree, and indexed by offset.
669 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
670 * lists, we instead now tag pages as dirty/writeback in the radix tree.
672 * All pagecache pages may be subject to I/O:
673 * - inode pages may need to be read from disk,
674 * - inode pages which have been modified and are MAP_SHARED may need
675 * to be written back to the inode on disk,
676 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
677 * modified may need to be swapped out to swap space and (later) to be read
682 * The zone field is never updated after free_area_init_core()
683 * sets it, so none of the operations on it need to be atomic.
686 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
687 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
688 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
689 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
690 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
693 * Define the bit shifts to access each section. For non-existent
694 * sections we define the shift as 0; that plus a 0 mask ensures
695 * the compiler will optimise away reference to them.
697 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
698 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
699 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
700 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
702 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
703 #ifdef NODE_NOT_IN_PAGE_FLAGS
704 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
705 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
706 SECTIONS_PGOFF : ZONES_PGOFF)
708 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
709 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
710 NODES_PGOFF : ZONES_PGOFF)
713 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
715 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
716 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
719 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
720 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
721 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
722 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
723 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
725 static inline enum zone_type page_zonenum(const struct page *page)
727 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
730 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
731 #define SECTION_IN_PAGE_FLAGS
735 * The identification function is mainly used by the buddy allocator for
736 * determining if two pages could be buddies. We are not really identifying
737 * the zone since we could be using the section number id if we do not have
738 * node id available in page flags.
739 * We only guarantee that it will return the same value for two combinable
742 static inline int page_zone_id(struct page *page)
744 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
747 static inline int zone_to_nid(struct zone *zone)
756 #ifdef NODE_NOT_IN_PAGE_FLAGS
757 extern int page_to_nid(const struct page *page);
759 static inline int page_to_nid(const struct page *page)
761 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
765 #ifdef CONFIG_NUMA_BALANCING
766 static inline int cpu_pid_to_cpupid(int cpu, int pid)
768 return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
771 static inline int cpupid_to_pid(int cpupid)
773 return cpupid & LAST__PID_MASK;
776 static inline int cpupid_to_cpu(int cpupid)
778 return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
781 static inline int cpupid_to_nid(int cpupid)
783 return cpu_to_node(cpupid_to_cpu(cpupid));
786 static inline bool cpupid_pid_unset(int cpupid)
788 return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
791 static inline bool cpupid_cpu_unset(int cpupid)
793 return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
796 static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
798 return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
801 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
802 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
803 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
805 return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
808 static inline int page_cpupid_last(struct page *page)
810 return page->_last_cpupid;
812 static inline void page_cpupid_reset_last(struct page *page)
814 page->_last_cpupid = -1 & LAST_CPUPID_MASK;
817 static inline int page_cpupid_last(struct page *page)
819 return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
822 extern int page_cpupid_xchg_last(struct page *page, int cpupid);
824 static inline void page_cpupid_reset_last(struct page *page)
826 int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
828 page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
829 page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
831 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
832 #else /* !CONFIG_NUMA_BALANCING */
833 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
835 return page_to_nid(page); /* XXX */
838 static inline int page_cpupid_last(struct page *page)
840 return page_to_nid(page); /* XXX */
843 static inline int cpupid_to_nid(int cpupid)
848 static inline int cpupid_to_pid(int cpupid)
853 static inline int cpupid_to_cpu(int cpupid)
858 static inline int cpu_pid_to_cpupid(int nid, int pid)
863 static inline bool cpupid_pid_unset(int cpupid)
868 static inline void page_cpupid_reset_last(struct page *page)
872 static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
876 #endif /* CONFIG_NUMA_BALANCING */
878 static inline struct zone *page_zone(const struct page *page)
880 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
883 #ifdef SECTION_IN_PAGE_FLAGS
884 static inline void set_page_section(struct page *page, unsigned long section)
886 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
887 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
890 static inline unsigned long page_to_section(const struct page *page)
892 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
896 static inline void set_page_zone(struct page *page, enum zone_type zone)
898 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
899 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
902 static inline void set_page_node(struct page *page, unsigned long node)
904 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
905 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
908 static inline void set_page_links(struct page *page, enum zone_type zone,
909 unsigned long node, unsigned long pfn)
911 set_page_zone(page, zone);
912 set_page_node(page, node);
913 #ifdef SECTION_IN_PAGE_FLAGS
914 set_page_section(page, pfn_to_section_nr(pfn));
919 * Some inline functions in vmstat.h depend on page_zone()
921 #include <linux/vmstat.h>
923 static __always_inline void *lowmem_page_address(const struct page *page)
925 return __va(PFN_PHYS(page_to_pfn(page)));
928 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
929 #define HASHED_PAGE_VIRTUAL
932 #if defined(WANT_PAGE_VIRTUAL)
933 static inline void *page_address(const struct page *page)
935 return page->virtual;
937 static inline void set_page_address(struct page *page, void *address)
939 page->virtual = address;
941 #define page_address_init() do { } while(0)
944 #if defined(HASHED_PAGE_VIRTUAL)
945 void *page_address(const struct page *page);
946 void set_page_address(struct page *page, void *virtual);
947 void page_address_init(void);
950 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
951 #define page_address(page) lowmem_page_address(page)
952 #define set_page_address(page, address) do { } while(0)
953 #define page_address_init() do { } while(0)
956 extern void *page_rmapping(struct page *page);
957 extern struct anon_vma *page_anon_vma(struct page *page);
958 extern struct address_space *page_mapping(struct page *page);
960 extern struct address_space *__page_file_mapping(struct page *);
963 struct address_space *page_file_mapping(struct page *page)
965 if (unlikely(PageSwapCache(page)))
966 return __page_file_mapping(page);
968 return page->mapping;
972 * Return the pagecache index of the passed page. Regular pagecache pages
973 * use ->index whereas swapcache pages use ->private
975 static inline pgoff_t page_index(struct page *page)
977 if (unlikely(PageSwapCache(page)))
978 return page_private(page);
982 extern pgoff_t __page_file_index(struct page *page);
985 * Return the file index of the page. Regular pagecache pages use ->index
986 * whereas swapcache pages use swp_offset(->private)
988 static inline pgoff_t page_file_index(struct page *page)
990 if (unlikely(PageSwapCache(page)))
991 return __page_file_index(page);
997 * Return true if this page is mapped into pagetables.
999 static inline int page_mapped(struct page *page)
1001 return atomic_read(&(page)->_mapcount) >= 0;
1005 * Return true only if the page has been allocated with
1006 * ALLOC_NO_WATERMARKS and the low watermark was not
1007 * met implying that the system is under some pressure.
1009 static inline bool page_is_pfmemalloc(struct page *page)
1012 * Page index cannot be this large so this must be
1013 * a pfmemalloc page.
1015 return page->index == -1UL;
1019 * Only to be called by the page allocator on a freshly allocated
1022 static inline void set_page_pfmemalloc(struct page *page)
1027 static inline void clear_page_pfmemalloc(struct page *page)
1033 * Different kinds of faults, as returned by handle_mm_fault().
1034 * Used to decide whether a process gets delivered SIGBUS or
1035 * just gets major/minor fault counters bumped up.
1038 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1040 #define VM_FAULT_OOM 0x0001
1041 #define VM_FAULT_SIGBUS 0x0002
1042 #define VM_FAULT_MAJOR 0x0004
1043 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1044 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1045 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1046 #define VM_FAULT_SIGSEGV 0x0040
1048 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1049 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1050 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1051 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1053 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1055 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1056 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1059 /* Encode hstate index for a hwpoisoned large page */
1060 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1061 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1064 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1066 extern void pagefault_out_of_memory(void);
1068 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1071 * Flags passed to show_mem() and show_free_areas() to suppress output in
1074 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1076 extern void show_free_areas(unsigned int flags);
1077 extern bool skip_free_areas_node(unsigned int flags, int nid);
1079 int shmem_zero_setup(struct vm_area_struct *);
1081 bool shmem_mapping(struct address_space *mapping);
1083 static inline bool shmem_mapping(struct address_space *mapping)
1089 extern int can_do_mlock(void);
1090 extern int user_shm_lock(size_t, struct user_struct *);
1091 extern void user_shm_unlock(size_t, struct user_struct *);
1094 * Parameter block passed down to zap_pte_range in exceptional cases.
1096 struct zap_details {
1097 struct address_space *check_mapping; /* Check page->mapping if set */
1098 pgoff_t first_index; /* Lowest page->index to unmap */
1099 pgoff_t last_index; /* Highest page->index to unmap */
1102 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
1105 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1106 unsigned long size);
1107 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
1108 unsigned long size, struct zap_details *);
1109 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
1110 unsigned long start, unsigned long end);
1113 * mm_walk - callbacks for walk_page_range
1114 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1115 * this handler is required to be able to handle
1116 * pmd_trans_huge() pmds. They may simply choose to
1117 * split_huge_page() instead of handling it explicitly.
1118 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1119 * @pte_hole: if set, called for each hole at all levels
1120 * @hugetlb_entry: if set, called for each hugetlb entry
1121 * @test_walk: caller specific callback function to determine whether
1122 * we walk over the current vma or not. A positive returned
1123 * value means "do page table walk over the current vma,"
1124 * and a negative one means "abort current page table walk
1125 * right now." 0 means "skip the current vma."
1126 * @mm: mm_struct representing the target process of page table walk
1127 * @vma: vma currently walked (NULL if walking outside vmas)
1128 * @private: private data for callbacks' usage
1130 * (see the comment on walk_page_range() for more details)
1133 int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1134 unsigned long next, struct mm_walk *walk);
1135 int (*pte_entry)(pte_t *pte, unsigned long addr,
1136 unsigned long next, struct mm_walk *walk);
1137 int (*pte_hole)(unsigned long addr, unsigned long next,
1138 struct mm_walk *walk);
1139 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1140 unsigned long addr, unsigned long next,
1141 struct mm_walk *walk);
1142 int (*test_walk)(unsigned long addr, unsigned long next,
1143 struct mm_walk *walk);
1144 struct mm_struct *mm;
1145 struct vm_area_struct *vma;
1149 int walk_page_range(unsigned long addr, unsigned long end,
1150 struct mm_walk *walk);
1151 int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
1152 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1153 unsigned long end, unsigned long floor, unsigned long ceiling);
1154 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1155 struct vm_area_struct *vma);
1156 void unmap_mapping_range(struct address_space *mapping,
1157 loff_t const holebegin, loff_t const holelen, int even_cows);
1158 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1159 unsigned long *pfn);
1160 int follow_phys(struct vm_area_struct *vma, unsigned long address,
1161 unsigned int flags, unsigned long *prot, resource_size_t *phys);
1162 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1163 void *buf, int len, int write);
1165 static inline void unmap_shared_mapping_range(struct address_space *mapping,
1166 loff_t const holebegin, loff_t const holelen)
1168 unmap_mapping_range(mapping, holebegin, holelen, 0);
1171 extern void truncate_pagecache(struct inode *inode, loff_t new);
1172 extern void truncate_setsize(struct inode *inode, loff_t newsize);
1173 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
1174 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1175 int truncate_inode_page(struct address_space *mapping, struct page *page);
1176 int generic_error_remove_page(struct address_space *mapping, struct page *page);
1177 int invalidate_inode_page(struct page *page);
1180 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
1181 unsigned long address, unsigned int flags);
1182 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1183 unsigned long address, unsigned int fault_flags);
1185 static inline int handle_mm_fault(struct mm_struct *mm,
1186 struct vm_area_struct *vma, unsigned long address,
1189 /* should never happen if there's no MMU */
1191 return VM_FAULT_SIGBUS;
1193 static inline int fixup_user_fault(struct task_struct *tsk,
1194 struct mm_struct *mm, unsigned long address,
1195 unsigned int fault_flags)
1197 /* should never happen if there's no MMU */
1203 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
1204 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1205 void *buf, int len, int write);
1207 long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1208 unsigned long start, unsigned long nr_pages,
1209 unsigned int foll_flags, struct page **pages,
1210 struct vm_area_struct **vmas, int *nonblocking);
1211 long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1212 unsigned long start, unsigned long nr_pages,
1213 int write, int force, struct page **pages,
1214 struct vm_area_struct **vmas);
1215 long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm,
1216 unsigned long start, unsigned long nr_pages,
1217 int write, int force, struct page **pages,
1219 long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
1220 unsigned long start, unsigned long nr_pages,
1221 int write, int force, struct page **pages,
1222 unsigned int gup_flags);
1223 long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
1224 unsigned long start, unsigned long nr_pages,
1225 int write, int force, struct page **pages);
1226 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1227 struct page **pages);
1229 int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1230 struct page **pages);
1231 int get_kernel_page(unsigned long start, int write, struct page **pages);
1232 struct page *get_dump_page(unsigned long addr);
1234 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1235 extern void do_invalidatepage(struct page *page, unsigned int offset,
1236 unsigned int length);
1238 int __set_page_dirty_nobuffers(struct page *page);
1239 int __set_page_dirty_no_writeback(struct page *page);
1240 int redirty_page_for_writepage(struct writeback_control *wbc,
1242 void account_page_dirtied(struct page *page, struct address_space *mapping);
1243 void account_page_cleaned(struct page *page, struct address_space *mapping);
1244 int set_page_dirty(struct page *page);
1245 int set_page_dirty_lock(struct page *page);
1246 int clear_page_dirty_for_io(struct page *page);
1248 int get_cmdline(struct task_struct *task, char *buffer, int buflen);
1250 /* Is the vma a continuation of the stack vma above it? */
1251 static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1253 return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
1256 static inline int stack_guard_page_start(struct vm_area_struct *vma,
1259 return (vma->vm_flags & VM_GROWSDOWN) &&
1260 (vma->vm_start == addr) &&
1261 !vma_growsdown(vma->vm_prev, addr);
1264 /* Is the vma a continuation of the stack vma below it? */
1265 static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
1267 return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
1270 static inline int stack_guard_page_end(struct vm_area_struct *vma,
1273 return (vma->vm_flags & VM_GROWSUP) &&
1274 (vma->vm_end == addr) &&
1275 !vma_growsup(vma->vm_next, addr);
1278 extern struct task_struct *task_of_stack(struct task_struct *task,
1279 struct vm_area_struct *vma, bool in_group);
1281 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1282 unsigned long old_addr, struct vm_area_struct *new_vma,
1283 unsigned long new_addr, unsigned long len,
1284 bool need_rmap_locks);
1285 extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1286 unsigned long end, pgprot_t newprot,
1287 int dirty_accountable, int prot_numa);
1288 extern int mprotect_fixup(struct vm_area_struct *vma,
1289 struct vm_area_struct **pprev, unsigned long start,
1290 unsigned long end, unsigned long newflags);
1293 * doesn't attempt to fault and will return short.
1295 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1296 struct page **pages);
1298 * per-process(per-mm_struct) statistics.
1300 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1302 long val = atomic_long_read(&mm->rss_stat.count[member]);
1304 #ifdef SPLIT_RSS_COUNTING
1306 * counter is updated in asynchronous manner and may go to minus.
1307 * But it's never be expected number for users.
1312 return (unsigned long)val;
1315 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1317 atomic_long_add(value, &mm->rss_stat.count[member]);
1320 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1322 atomic_long_inc(&mm->rss_stat.count[member]);
1325 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1327 atomic_long_dec(&mm->rss_stat.count[member]);
1330 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1332 return get_mm_counter(mm, MM_FILEPAGES) +
1333 get_mm_counter(mm, MM_ANONPAGES);
1336 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1338 return max(mm->hiwater_rss, get_mm_rss(mm));
1341 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1343 return max(mm->hiwater_vm, mm->total_vm);
1346 static inline void update_hiwater_rss(struct mm_struct *mm)
1348 unsigned long _rss = get_mm_rss(mm);
1350 if ((mm)->hiwater_rss < _rss)
1351 (mm)->hiwater_rss = _rss;
1354 static inline void update_hiwater_vm(struct mm_struct *mm)
1356 if (mm->hiwater_vm < mm->total_vm)
1357 mm->hiwater_vm = mm->total_vm;
1360 static inline void reset_mm_hiwater_rss(struct mm_struct *mm)
1362 mm->hiwater_rss = get_mm_rss(mm);
1365 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1366 struct mm_struct *mm)
1368 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1370 if (*maxrss < hiwater_rss)
1371 *maxrss = hiwater_rss;
1374 #if defined(SPLIT_RSS_COUNTING)
1375 void sync_mm_rss(struct mm_struct *mm);
1377 static inline void sync_mm_rss(struct mm_struct *mm)
1382 int vma_wants_writenotify(struct vm_area_struct *vma);
1384 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1386 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1390 __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1394 #ifdef __PAGETABLE_PUD_FOLDED
1395 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1396 unsigned long address)
1401 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1404 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1405 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1406 unsigned long address)
1411 static inline void mm_nr_pmds_init(struct mm_struct *mm) {}
1413 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1418 static inline void mm_inc_nr_pmds(struct mm_struct *mm) {}
1419 static inline void mm_dec_nr_pmds(struct mm_struct *mm) {}
1422 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1424 static inline void mm_nr_pmds_init(struct mm_struct *mm)
1426 atomic_long_set(&mm->nr_pmds, 0);
1429 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1431 return atomic_long_read(&mm->nr_pmds);
1434 static inline void mm_inc_nr_pmds(struct mm_struct *mm)
1436 atomic_long_inc(&mm->nr_pmds);
1439 static inline void mm_dec_nr_pmds(struct mm_struct *mm)
1441 atomic_long_dec(&mm->nr_pmds);
1445 int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1446 pmd_t *pmd, unsigned long address);
1447 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1450 * The following ifdef needed to get the 4level-fixup.h header to work.
1451 * Remove it when 4level-fixup.h has been removed.
1453 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1454 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1456 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1457 NULL: pud_offset(pgd, address);
1460 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1462 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1463 NULL: pmd_offset(pud, address);
1465 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1467 #if USE_SPLIT_PTE_PTLOCKS
1468 #if ALLOC_SPLIT_PTLOCKS
1469 void __init ptlock_cache_init(void);
1470 extern bool ptlock_alloc(struct page *page);
1471 extern void ptlock_free(struct page *page);
1473 static inline spinlock_t *ptlock_ptr(struct page *page)
1477 #else /* ALLOC_SPLIT_PTLOCKS */
1478 static inline void ptlock_cache_init(void)
1482 static inline bool ptlock_alloc(struct page *page)
1487 static inline void ptlock_free(struct page *page)
1491 static inline spinlock_t *ptlock_ptr(struct page *page)
1495 #endif /* ALLOC_SPLIT_PTLOCKS */
1497 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1499 return ptlock_ptr(pmd_page(*pmd));
1502 static inline bool ptlock_init(struct page *page)
1505 * prep_new_page() initialize page->private (and therefore page->ptl)
1506 * with 0. Make sure nobody took it in use in between.
1508 * It can happen if arch try to use slab for page table allocation:
1509 * slab code uses page->slab_cache and page->first_page (for tail
1510 * pages), which share storage with page->ptl.
1512 VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
1513 if (!ptlock_alloc(page))
1515 spin_lock_init(ptlock_ptr(page));
1519 /* Reset page->mapping so free_pages_check won't complain. */
1520 static inline void pte_lock_deinit(struct page *page)
1522 page->mapping = NULL;
1526 #else /* !USE_SPLIT_PTE_PTLOCKS */
1528 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1530 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1532 return &mm->page_table_lock;
1534 static inline void ptlock_cache_init(void) {}
1535 static inline bool ptlock_init(struct page *page) { return true; }
1536 static inline void pte_lock_deinit(struct page *page) {}
1537 #endif /* USE_SPLIT_PTE_PTLOCKS */
1539 static inline void pgtable_init(void)
1541 ptlock_cache_init();
1542 pgtable_cache_init();
1545 static inline bool pgtable_page_ctor(struct page *page)
1547 inc_zone_page_state(page, NR_PAGETABLE);
1548 return ptlock_init(page);
1551 static inline void pgtable_page_dtor(struct page *page)
1553 pte_lock_deinit(page);
1554 dec_zone_page_state(page, NR_PAGETABLE);
1557 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1559 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1560 pte_t *__pte = pte_offset_map(pmd, address); \
1566 #define pte_unmap_unlock(pte, ptl) do { \
1571 #define pte_alloc_map(mm, vma, pmd, address) \
1572 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1574 NULL: pte_offset_map(pmd, address))
1576 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1577 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1579 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1581 #define pte_alloc_kernel(pmd, address) \
1582 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1583 NULL: pte_offset_kernel(pmd, address))
1585 #if USE_SPLIT_PMD_PTLOCKS
1587 static struct page *pmd_to_page(pmd_t *pmd)
1589 unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
1590 return virt_to_page((void *)((unsigned long) pmd & mask));
1593 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1595 return ptlock_ptr(pmd_to_page(pmd));
1598 static inline bool pgtable_pmd_page_ctor(struct page *page)
1600 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1601 page->pmd_huge_pte = NULL;
1603 return ptlock_init(page);
1606 static inline void pgtable_pmd_page_dtor(struct page *page)
1608 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1609 VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
1614 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1618 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1620 return &mm->page_table_lock;
1623 static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
1624 static inline void pgtable_pmd_page_dtor(struct page *page) {}
1626 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1630 static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
1632 spinlock_t *ptl = pmd_lockptr(mm, pmd);
1637 extern void free_area_init(unsigned long * zones_size);
1638 extern void free_area_init_node(int nid, unsigned long * zones_size,
1639 unsigned long zone_start_pfn, unsigned long *zholes_size);
1640 extern void free_initmem(void);
1643 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1644 * into the buddy system. The freed pages will be poisoned with pattern
1645 * "poison" if it's within range [0, UCHAR_MAX].
1646 * Return pages freed into the buddy system.
1648 extern unsigned long free_reserved_area(void *start, void *end,
1649 int poison, char *s);
1651 #ifdef CONFIG_HIGHMEM
1653 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1654 * and totalram_pages.
1656 extern void free_highmem_page(struct page *page);
1659 extern void adjust_managed_page_count(struct page *page, long count);
1660 extern void mem_init_print_info(const char *str);
1662 /* Free the reserved page into the buddy system, so it gets managed. */
1663 static inline void __free_reserved_page(struct page *page)
1665 ClearPageReserved(page);
1666 init_page_count(page);
1670 static inline void free_reserved_page(struct page *page)
1672 __free_reserved_page(page);
1673 adjust_managed_page_count(page, 1);
1676 static inline void mark_page_reserved(struct page *page)
1678 SetPageReserved(page);
1679 adjust_managed_page_count(page, -1);
1683 * Default method to free all the __init memory into the buddy system.
1684 * The freed pages will be poisoned with pattern "poison" if it's within
1685 * range [0, UCHAR_MAX].
1686 * Return pages freed into the buddy system.
1688 static inline unsigned long free_initmem_default(int poison)
1690 extern char __init_begin[], __init_end[];
1692 return free_reserved_area(&__init_begin, &__init_end,
1693 poison, "unused kernel");
1696 static inline unsigned long get_num_physpages(void)
1699 unsigned long phys_pages = 0;
1701 for_each_online_node(nid)
1702 phys_pages += node_present_pages(nid);
1707 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1709 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1710 * zones, allocate the backing mem_map and account for memory holes in a more
1711 * architecture independent manner. This is a substitute for creating the
1712 * zone_sizes[] and zholes_size[] arrays and passing them to
1713 * free_area_init_node()
1715 * An architecture is expected to register range of page frames backed by
1716 * physical memory with memblock_add[_node]() before calling
1717 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1718 * usage, an architecture is expected to do something like
1720 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1722 * for_each_valid_physical_page_range()
1723 * memblock_add_node(base, size, nid)
1724 * free_area_init_nodes(max_zone_pfns);
1726 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1727 * registered physical page range. Similarly
1728 * sparse_memory_present_with_active_regions() calls memory_present() for
1729 * each range when SPARSEMEM is enabled.
1731 * See mm/page_alloc.c for more information on each function exposed by
1732 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1734 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1735 unsigned long node_map_pfn_alignment(void);
1736 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1737 unsigned long end_pfn);
1738 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1739 unsigned long end_pfn);
1740 extern void get_pfn_range_for_nid(unsigned int nid,
1741 unsigned long *start_pfn, unsigned long *end_pfn);
1742 extern unsigned long find_min_pfn_with_active_regions(void);
1743 extern void free_bootmem_with_active_regions(int nid,
1744 unsigned long max_low_pfn);
1745 extern void sparse_memory_present_with_active_regions(int nid);
1747 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1749 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1750 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1751 static inline int __early_pfn_to_nid(unsigned long pfn)
1756 /* please see mm/page_alloc.c */
1757 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1758 /* there is a per-arch backend function. */
1759 extern int __meminit __early_pfn_to_nid(unsigned long pfn);
1762 extern void set_dma_reserve(unsigned long new_dma_reserve);
1763 extern void memmap_init_zone(unsigned long, int, unsigned long,
1764 unsigned long, enum memmap_context);
1765 extern void setup_per_zone_wmarks(void);
1766 extern int __meminit init_per_zone_wmark_min(void);
1767 extern void mem_init(void);
1768 extern void __init mmap_init(void);
1769 extern void show_mem(unsigned int flags);
1770 extern void si_meminfo(struct sysinfo * val);
1771 extern void si_meminfo_node(struct sysinfo *val, int nid);
1773 extern __printf(3, 4)
1774 void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
1776 extern void setup_per_cpu_pageset(void);
1778 extern void zone_pcp_update(struct zone *zone);
1779 extern void zone_pcp_reset(struct zone *zone);
1782 extern int min_free_kbytes;
1785 extern atomic_long_t mmap_pages_allocated;
1786 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1788 /* interval_tree.c */
1789 void vma_interval_tree_insert(struct vm_area_struct *node,
1790 struct rb_root *root);
1791 void vma_interval_tree_insert_after(struct vm_area_struct *node,
1792 struct vm_area_struct *prev,
1793 struct rb_root *root);
1794 void vma_interval_tree_remove(struct vm_area_struct *node,
1795 struct rb_root *root);
1796 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1797 unsigned long start, unsigned long last);
1798 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1799 unsigned long start, unsigned long last);
1801 #define vma_interval_tree_foreach(vma, root, start, last) \
1802 for (vma = vma_interval_tree_iter_first(root, start, last); \
1803 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1805 void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1806 struct rb_root *root);
1807 void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1808 struct rb_root *root);
1809 struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1810 struct rb_root *root, unsigned long start, unsigned long last);
1811 struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1812 struct anon_vma_chain *node, unsigned long start, unsigned long last);
1813 #ifdef CONFIG_DEBUG_VM_RB
1814 void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1817 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1818 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1819 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1822 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1823 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1824 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1825 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1826 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1827 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1828 struct mempolicy *);
1829 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1830 extern int split_vma(struct mm_struct *,
1831 struct vm_area_struct *, unsigned long addr, int new_below);
1832 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1833 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1834 struct rb_node **, struct rb_node *);
1835 extern void unlink_file_vma(struct vm_area_struct *);
1836 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1837 unsigned long addr, unsigned long len, pgoff_t pgoff,
1838 bool *need_rmap_locks);
1839 extern void exit_mmap(struct mm_struct *);
1841 static inline int check_data_rlimit(unsigned long rlim,
1843 unsigned long start,
1844 unsigned long end_data,
1845 unsigned long start_data)
1847 if (rlim < RLIM_INFINITY) {
1848 if (((new - start) + (end_data - start_data)) > rlim)
1855 extern int mm_take_all_locks(struct mm_struct *mm);
1856 extern void mm_drop_all_locks(struct mm_struct *mm);
1858 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1859 extern struct file *get_mm_exe_file(struct mm_struct *mm);
1861 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1862 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
1863 unsigned long addr, unsigned long len,
1864 unsigned long flags,
1865 const struct vm_special_mapping *spec);
1866 /* This is an obsolete alternative to _install_special_mapping. */
1867 extern int install_special_mapping(struct mm_struct *mm,
1868 unsigned long addr, unsigned long len,
1869 unsigned long flags, struct page **pages);
1871 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1873 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1874 unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
1875 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1876 unsigned long len, unsigned long prot, unsigned long flags,
1877 unsigned long pgoff, unsigned long *populate);
1878 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1881 extern int __mm_populate(unsigned long addr, unsigned long len,
1883 static inline void mm_populate(unsigned long addr, unsigned long len)
1886 (void) __mm_populate(addr, len, 1);
1889 static inline void mm_populate(unsigned long addr, unsigned long len) {}
1892 /* These take the mm semaphore themselves */
1893 extern unsigned long vm_brk(unsigned long, unsigned long);
1894 extern int vm_munmap(unsigned long, size_t);
1895 extern unsigned long vm_mmap(struct file *, unsigned long,
1896 unsigned long, unsigned long,
1897 unsigned long, unsigned long);
1899 struct vm_unmapped_area_info {
1900 #define VM_UNMAPPED_AREA_TOPDOWN 1
1901 unsigned long flags;
1902 unsigned long length;
1903 unsigned long low_limit;
1904 unsigned long high_limit;
1905 unsigned long align_mask;
1906 unsigned long align_offset;
1909 extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
1910 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
1913 * Search for an unmapped address range.
1915 * We are looking for a range that:
1916 * - does not intersect with any VMA;
1917 * - is contained within the [low_limit, high_limit) interval;
1918 * - is at least the desired size.
1919 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1921 static inline unsigned long
1922 vm_unmapped_area(struct vm_unmapped_area_info *info)
1924 if (info->flags & VM_UNMAPPED_AREA_TOPDOWN)
1925 return unmapped_area_topdown(info);
1927 return unmapped_area(info);
1931 extern void truncate_inode_pages(struct address_space *, loff_t);
1932 extern void truncate_inode_pages_range(struct address_space *,
1933 loff_t lstart, loff_t lend);
1934 extern void truncate_inode_pages_final(struct address_space *);
1936 /* generic vm_area_ops exported for stackable file systems */
1937 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1938 extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
1939 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1941 /* mm/page-writeback.c */
1942 int write_one_page(struct page *page, int wait);
1943 void task_dirty_inc(struct task_struct *tsk);
1946 #define VM_MAX_READAHEAD 128 /* kbytes */
1947 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1949 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1950 pgoff_t offset, unsigned long nr_to_read);
1952 void page_cache_sync_readahead(struct address_space *mapping,
1953 struct file_ra_state *ra,
1956 unsigned long size);
1958 void page_cache_async_readahead(struct address_space *mapping,
1959 struct file_ra_state *ra,
1963 unsigned long size);
1965 unsigned long max_sane_readahead(unsigned long nr);
1967 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1968 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1970 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1971 extern int expand_downwards(struct vm_area_struct *vma,
1972 unsigned long address);
1974 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1976 #define expand_upwards(vma, address) (0)
1979 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1980 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1981 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1982 struct vm_area_struct **pprev);
1984 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1985 NULL if none. Assume start_addr < end_addr. */
1986 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1988 struct vm_area_struct * vma = find_vma(mm,start_addr);
1990 if (vma && end_addr <= vma->vm_start)
1995 static inline unsigned long vma_pages(struct vm_area_struct *vma)
1997 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
2000 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2001 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
2002 unsigned long vm_start, unsigned long vm_end)
2004 struct vm_area_struct *vma = find_vma(mm, vm_start);
2006 if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
2013 pgprot_t vm_get_page_prot(unsigned long vm_flags);
2014 void vma_set_page_prot(struct vm_area_struct *vma);
2016 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
2020 static inline void vma_set_page_prot(struct vm_area_struct *vma)
2022 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
2026 #ifdef CONFIG_NUMA_BALANCING
2027 unsigned long change_prot_numa(struct vm_area_struct *vma,
2028 unsigned long start, unsigned long end);
2031 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
2032 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
2033 unsigned long pfn, unsigned long size, pgprot_t);
2034 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
2035 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
2037 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
2039 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
2042 struct page *follow_page_mask(struct vm_area_struct *vma,
2043 unsigned long address, unsigned int foll_flags,
2044 unsigned int *page_mask);
2046 static inline struct page *follow_page(struct vm_area_struct *vma,
2047 unsigned long address, unsigned int foll_flags)
2049 unsigned int unused_page_mask;
2050 return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
2053 #define FOLL_WRITE 0x01 /* check pte is writable */
2054 #define FOLL_TOUCH 0x02 /* mark page accessed */
2055 #define FOLL_GET 0x04 /* do get_page on page */
2056 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2057 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2058 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2059 * and return without waiting upon it */
2060 #define FOLL_POPULATE 0x40 /* fault in page */
2061 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2062 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2063 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2064 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2065 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2067 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
2069 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
2070 unsigned long size, pte_fn_t fn, void *data);
2072 #ifdef CONFIG_PROC_FS
2073 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
2075 static inline void vm_stat_account(struct mm_struct *mm,
2076 unsigned long flags, struct file *file, long pages)
2078 mm->total_vm += pages;
2080 #endif /* CONFIG_PROC_FS */
2082 #ifdef CONFIG_DEBUG_PAGEALLOC
2083 extern bool _debug_pagealloc_enabled;
2084 extern void __kernel_map_pages(struct page *page, int numpages, int enable);
2086 static inline bool debug_pagealloc_enabled(void)
2088 return _debug_pagealloc_enabled;
2092 kernel_map_pages(struct page *page, int numpages, int enable)
2094 if (!debug_pagealloc_enabled())
2097 __kernel_map_pages(page, numpages, enable);
2099 #ifdef CONFIG_HIBERNATION
2100 extern bool kernel_page_present(struct page *page);
2101 #endif /* CONFIG_HIBERNATION */
2104 kernel_map_pages(struct page *page, int numpages, int enable) {}
2105 #ifdef CONFIG_HIBERNATION
2106 static inline bool kernel_page_present(struct page *page) { return true; }
2107 #endif /* CONFIG_HIBERNATION */
2110 #ifdef __HAVE_ARCH_GATE_AREA
2111 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
2112 extern int in_gate_area_no_mm(unsigned long addr);
2113 extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
2115 static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
2119 static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
2120 static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
2124 #endif /* __HAVE_ARCH_GATE_AREA */
2126 #ifdef CONFIG_SYSCTL
2127 extern int sysctl_drop_caches;
2128 int drop_caches_sysctl_handler(struct ctl_table *, int,
2129 void __user *, size_t *, loff_t *);
2132 void drop_slab(void);
2133 void drop_slab_node(int nid);
2136 #define randomize_va_space 0
2138 extern int randomize_va_space;
2141 const char * arch_vma_name(struct vm_area_struct *vma);
2142 void print_vma_addr(char *prefix, unsigned long rip);
2144 void sparse_mem_maps_populate_node(struct page **map_map,
2145 unsigned long pnum_begin,
2146 unsigned long pnum_end,
2147 unsigned long map_count,
2150 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
2151 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
2152 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
2153 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
2154 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
2155 void *vmemmap_alloc_block(unsigned long size, int node);
2156 void *vmemmap_alloc_block_buf(unsigned long size, int node);
2157 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
2158 int vmemmap_populate_basepages(unsigned long start, unsigned long end,
2160 int vmemmap_populate(unsigned long start, unsigned long end, int node);
2161 void vmemmap_populate_print_last(void);
2162 #ifdef CONFIG_MEMORY_HOTPLUG
2163 void vmemmap_free(unsigned long start, unsigned long end);
2165 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
2166 unsigned long size);
2169 MF_COUNT_INCREASED = 1 << 0,
2170 MF_ACTION_REQUIRED = 1 << 1,
2171 MF_MUST_KILL = 1 << 2,
2172 MF_SOFT_OFFLINE = 1 << 3,
2174 extern int memory_failure(unsigned long pfn, int trapno, int flags);
2175 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
2176 extern int unpoison_memory(unsigned long pfn);
2177 extern int sysctl_memory_failure_early_kill;
2178 extern int sysctl_memory_failure_recovery;
2179 extern void shake_page(struct page *p, int access);
2180 extern atomic_long_t num_poisoned_pages;
2181 extern int soft_offline_page(struct page *page, int flags);
2183 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2184 extern void clear_huge_page(struct page *page,
2186 unsigned int pages_per_huge_page);
2187 extern void copy_user_huge_page(struct page *dst, struct page *src,
2188 unsigned long addr, struct vm_area_struct *vma,
2189 unsigned int pages_per_huge_page);
2190 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2192 extern struct page_ext_operations debug_guardpage_ops;
2193 extern struct page_ext_operations page_poisoning_ops;
2195 #ifdef CONFIG_DEBUG_PAGEALLOC
2196 extern unsigned int _debug_guardpage_minorder;
2197 extern bool _debug_guardpage_enabled;
2199 static inline unsigned int debug_guardpage_minorder(void)
2201 return _debug_guardpage_minorder;
2204 static inline bool debug_guardpage_enabled(void)
2206 return _debug_guardpage_enabled;
2209 static inline bool page_is_guard(struct page *page)
2211 struct page_ext *page_ext;
2213 if (!debug_guardpage_enabled())
2216 page_ext = lookup_page_ext(page);
2217 return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
2220 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2221 static inline bool debug_guardpage_enabled(void) { return false; }
2222 static inline bool page_is_guard(struct page *page) { return false; }
2223 #endif /* CONFIG_DEBUG_PAGEALLOC */
2225 #if MAX_NUMNODES > 1
2226 void __init setup_nr_node_ids(void);
2228 static inline void setup_nr_node_ids(void) {}
2231 #endif /* __KERNEL__ */
2232 #endif /* _LINUX_MM_H */