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;
32 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
33 extern unsigned long max_mapnr;
35 static inline void set_max_mapnr(unsigned long limit)
40 static inline void set_max_mapnr(unsigned long limit) { }
43 extern unsigned long totalram_pages;
44 extern void * high_memory;
45 extern int page_cluster;
48 extern int sysctl_legacy_va_layout;
50 #define sysctl_legacy_va_layout 0
54 #include <asm/pgtable.h>
55 #include <asm/processor.h>
58 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
62 * To prevent common memory management code establishing
63 * a zero page mapping on a read fault.
64 * This macro should be defined within <asm/pgtable.h>.
65 * s390 does this to prevent multiplexing of hardware bits
66 * related to the physical page in case of virtualization.
68 #ifndef mm_forbids_zeropage
69 #define mm_forbids_zeropage(X) (0)
72 extern unsigned long sysctl_user_reserve_kbytes;
73 extern unsigned long sysctl_admin_reserve_kbytes;
75 extern int sysctl_overcommit_memory;
76 extern int sysctl_overcommit_ratio;
77 extern unsigned long sysctl_overcommit_kbytes;
79 extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *,
81 extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
84 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
86 /* to align the pointer to the (next) page boundary */
87 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
89 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
90 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
93 * Linux kernel virtual memory manager primitives.
94 * The idea being to have a "virtual" mm in the same way
95 * we have a virtual fs - giving a cleaner interface to the
96 * mm details, and allowing different kinds of memory mappings
97 * (from shared memory to executable loading to arbitrary
101 extern struct kmem_cache *vm_area_cachep;
104 extern struct rb_root nommu_region_tree;
105 extern struct rw_semaphore nommu_region_sem;
107 extern unsigned int kobjsize(const void *objp);
111 * vm_flags in vm_area_struct, see mm_types.h.
113 #define VM_NONE 0x00000000
115 #define VM_READ 0x00000001 /* currently active flags */
116 #define VM_WRITE 0x00000002
117 #define VM_EXEC 0x00000004
118 #define VM_SHARED 0x00000008
120 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
121 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
122 #define VM_MAYWRITE 0x00000020
123 #define VM_MAYEXEC 0x00000040
124 #define VM_MAYSHARE 0x00000080
126 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
127 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
128 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
130 #define VM_LOCKED 0x00002000
131 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
133 /* Used by sys_madvise() */
134 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
135 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
137 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
138 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
139 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
140 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
141 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
142 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
143 #define VM_ARCH_2 0x02000000
144 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
146 #ifdef CONFIG_MEM_SOFT_DIRTY
147 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
149 # define VM_SOFTDIRTY 0
152 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
153 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
154 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
155 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
157 #if defined(CONFIG_X86)
158 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
159 #elif defined(CONFIG_PPC)
160 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
161 #elif defined(CONFIG_PARISC)
162 # define VM_GROWSUP VM_ARCH_1
163 #elif defined(CONFIG_METAG)
164 # define VM_GROWSUP VM_ARCH_1
165 #elif defined(CONFIG_IA64)
166 # define VM_GROWSUP VM_ARCH_1
167 #elif !defined(CONFIG_MMU)
168 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
171 #if defined(CONFIG_X86)
172 /* MPX specific bounds table or bounds directory */
173 # define VM_MPX VM_ARCH_2
177 # define VM_GROWSUP VM_NONE
180 /* Bits set in the VMA until the stack is in its final location */
181 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
183 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
184 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
187 #ifdef CONFIG_STACK_GROWSUP
188 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
190 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
194 * Special vmas that are non-mergable, non-mlock()able.
195 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
197 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
199 /* This mask defines which mm->def_flags a process can inherit its parent */
200 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
203 * mapping from the currently active vm_flags protection bits (the
204 * low four bits) to a page protection mask..
206 extern pgprot_t protection_map[16];
208 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
209 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
210 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
211 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
212 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
213 #define FAULT_FLAG_TRIED 0x20 /* Second try */
214 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
217 * vm_fault is filled by the the pagefault handler and passed to the vma's
218 * ->fault function. The vma's ->fault is responsible for returning a bitmask
219 * of VM_FAULT_xxx flags that give details about how the fault was handled.
221 * pgoff should be used in favour of virtual_address, if possible.
224 unsigned int flags; /* FAULT_FLAG_xxx flags */
225 pgoff_t pgoff; /* Logical page offset based on vma */
226 void __user *virtual_address; /* Faulting virtual address */
228 struct page *cow_page; /* Handler may choose to COW */
229 struct page *page; /* ->fault handlers should return a
230 * page here, unless VM_FAULT_NOPAGE
231 * is set (which is also implied by
234 /* for ->map_pages() only */
235 pgoff_t max_pgoff; /* map pages for offset from pgoff till
236 * max_pgoff inclusive */
237 pte_t *pte; /* pte entry associated with ->pgoff */
241 * These are the virtual MM functions - opening of an area, closing and
242 * unmapping it (needed to keep files on disk up-to-date etc), pointer
243 * to the functions called when a no-page or a wp-page exception occurs.
245 struct vm_operations_struct {
246 void (*open)(struct vm_area_struct * area);
247 void (*close)(struct vm_area_struct * area);
248 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
249 void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
251 /* notification that a previously read-only page is about to become
252 * writable, if an error is returned it will cause a SIGBUS */
253 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
255 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
256 int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
258 /* called by access_process_vm when get_user_pages() fails, typically
259 * for use by special VMAs that can switch between memory and hardware
261 int (*access)(struct vm_area_struct *vma, unsigned long addr,
262 void *buf, int len, int write);
264 /* Called by the /proc/PID/maps code to ask the vma whether it
265 * has a special name. Returning non-NULL will also cause this
266 * vma to be dumped unconditionally. */
267 const char *(*name)(struct vm_area_struct *vma);
271 * set_policy() op must add a reference to any non-NULL @new mempolicy
272 * to hold the policy upon return. Caller should pass NULL @new to
273 * remove a policy and fall back to surrounding context--i.e. do not
274 * install a MPOL_DEFAULT policy, nor the task or system default
277 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
280 * get_policy() op must add reference [mpol_get()] to any policy at
281 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
282 * in mm/mempolicy.c will do this automatically.
283 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
284 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
285 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
286 * must return NULL--i.e., do not "fallback" to task or system default
289 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
293 * Called by vm_normal_page() for special PTEs to find the
294 * page for @addr. This is useful if the default behavior
295 * (using pte_page()) would not find the correct page.
297 struct page *(*find_special_page)(struct vm_area_struct *vma,
304 #define page_private(page) ((page)->private)
305 #define set_page_private(page, v) ((page)->private = (v))
307 /* It's valid only if the page is free path or free_list */
308 static inline void set_freepage_migratetype(struct page *page, int migratetype)
310 page->index = migratetype;
313 /* It's valid only if the page is free path or free_list */
314 static inline int get_freepage_migratetype(struct page *page)
320 * FIXME: take this include out, include page-flags.h in
321 * files which need it (119 of them)
323 #include <linux/page-flags.h>
324 #include <linux/huge_mm.h>
327 * Methods to modify the page usage count.
329 * What counts for a page usage:
330 * - cache mapping (page->mapping)
331 * - private data (page->private)
332 * - page mapped in a task's page tables, each mapping
333 * is counted separately
335 * Also, many kernel routines increase the page count before a critical
336 * routine so they can be sure the page doesn't go away from under them.
340 * Drop a ref, return true if the refcount fell to zero (the page has no users)
342 static inline int put_page_testzero(struct page *page)
344 VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page);
345 return atomic_dec_and_test(&page->_count);
349 * Try to grab a ref unless the page has a refcount of zero, return false if
351 * This can be called when MMU is off so it must not access
352 * any of the virtual mappings.
354 static inline int get_page_unless_zero(struct page *page)
356 return atomic_inc_not_zero(&page->_count);
360 * Try to drop a ref unless the page has a refcount of one, return false if
362 * This is to make sure that the refcount won't become zero after this drop.
363 * This can be called when MMU is off so it must not access
364 * any of the virtual mappings.
366 static inline int put_page_unless_one(struct page *page)
368 return atomic_add_unless(&page->_count, -1, 1);
371 extern int page_is_ram(unsigned long pfn);
372 extern int region_is_ram(resource_size_t phys_addr, unsigned long size);
374 /* Support for virtually mapped pages */
375 struct page *vmalloc_to_page(const void *addr);
376 unsigned long vmalloc_to_pfn(const void *addr);
379 * Determine if an address is within the vmalloc range
381 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
382 * is no special casing required.
384 static inline int is_vmalloc_addr(const void *x)
387 unsigned long addr = (unsigned long)x;
389 return addr >= VMALLOC_START && addr < VMALLOC_END;
395 extern int is_vmalloc_or_module_addr(const void *x);
397 static inline int is_vmalloc_or_module_addr(const void *x)
403 extern void kvfree(const void *addr);
405 static inline void compound_lock(struct page *page)
407 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
408 VM_BUG_ON_PAGE(PageSlab(page), page);
409 bit_spin_lock(PG_compound_lock, &page->flags);
413 static inline void compound_unlock(struct page *page)
415 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
416 VM_BUG_ON_PAGE(PageSlab(page), page);
417 bit_spin_unlock(PG_compound_lock, &page->flags);
421 static inline unsigned long compound_lock_irqsave(struct page *page)
423 unsigned long uninitialized_var(flags);
424 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
425 local_irq_save(flags);
431 static inline void compound_unlock_irqrestore(struct page *page,
434 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
435 compound_unlock(page);
436 local_irq_restore(flags);
440 static inline struct page *compound_head_by_tail(struct page *tail)
442 struct page *head = tail->first_page;
445 * page->first_page may be a dangling pointer to an old
446 * compound page, so recheck that it is still a tail
447 * page before returning.
450 if (likely(PageTail(tail)))
456 * Since either compound page could be dismantled asynchronously in THP
457 * or we access asynchronously arbitrary positioned struct page, there
458 * would be tail flag race. To handle this race, we should call
459 * smp_rmb() before checking tail flag. compound_head_by_tail() did it.
461 static inline struct page *compound_head(struct page *page)
463 if (unlikely(PageTail(page)))
464 return compound_head_by_tail(page);
469 * If we access compound page synchronously such as access to
470 * allocated page, there is no need to handle tail flag race, so we can
471 * check tail flag directly without any synchronization primitive.
473 static inline struct page *compound_head_fast(struct page *page)
475 if (unlikely(PageTail(page)))
476 return page->first_page;
481 * The atomic page->_mapcount, starts from -1: so that transitions
482 * both from it and to it can be tracked, using atomic_inc_and_test
483 * and atomic_add_negative(-1).
485 static inline void page_mapcount_reset(struct page *page)
487 atomic_set(&(page)->_mapcount, -1);
490 static inline int page_mapcount(struct page *page)
492 VM_BUG_ON_PAGE(PageSlab(page), page);
493 return atomic_read(&page->_mapcount) + 1;
496 static inline int page_count(struct page *page)
498 return atomic_read(&compound_head(page)->_count);
501 static inline bool __compound_tail_refcounted(struct page *page)
503 return PageAnon(page) && !PageSlab(page) && !PageHeadHuge(page);
507 * This takes a head page as parameter and tells if the
508 * tail page reference counting can be skipped.
510 * For this to be safe, PageSlab and PageHeadHuge must remain true on
511 * any given page where they return true here, until all tail pins
512 * have been released.
514 static inline bool compound_tail_refcounted(struct page *page)
516 VM_BUG_ON_PAGE(!PageHead(page), page);
517 return __compound_tail_refcounted(page);
520 static inline void get_huge_page_tail(struct page *page)
523 * __split_huge_page_refcount() cannot run from under us.
525 VM_BUG_ON_PAGE(!PageTail(page), page);
526 VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
527 VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page);
528 if (compound_tail_refcounted(page->first_page))
529 atomic_inc(&page->_mapcount);
532 extern bool __get_page_tail(struct page *page);
534 static inline void get_page(struct page *page)
536 if (unlikely(PageTail(page)))
537 if (likely(__get_page_tail(page)))
540 * Getting a normal page or the head of a compound page
541 * requires to already have an elevated page->_count.
543 VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
544 atomic_inc(&page->_count);
547 static inline struct page *virt_to_head_page(const void *x)
549 struct page *page = virt_to_page(x);
552 * We don't need to worry about synchronization of tail flag
553 * when we call virt_to_head_page() since it is only called for
554 * already allocated page and this page won't be freed until
555 * this virt_to_head_page() is finished. So use _fast variant.
557 return compound_head_fast(page);
561 * Setup the page count before being freed into the page allocator for
562 * the first time (boot or memory hotplug)
564 static inline void init_page_count(struct page *page)
566 atomic_set(&page->_count, 1);
569 void put_page(struct page *page);
570 void put_pages_list(struct list_head *pages);
572 void split_page(struct page *page, unsigned int order);
573 int split_free_page(struct page *page);
576 * Compound pages have a destructor function. Provide a
577 * prototype for that function and accessor functions.
578 * These are _only_ valid on the head of a PG_compound page.
581 static inline void set_compound_page_dtor(struct page *page,
582 compound_page_dtor *dtor)
584 page[1].compound_dtor = dtor;
587 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
589 return page[1].compound_dtor;
592 static inline int compound_order(struct page *page)
596 return page[1].compound_order;
599 static inline void set_compound_order(struct page *page, unsigned long order)
601 page[1].compound_order = order;
606 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
607 * servicing faults for write access. In the normal case, do always want
608 * pte_mkwrite. But get_user_pages can cause write faults for mappings
609 * that do not have writing enabled, when used by access_process_vm.
611 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
613 if (likely(vma->vm_flags & VM_WRITE))
614 pte = pte_mkwrite(pte);
618 void do_set_pte(struct vm_area_struct *vma, unsigned long address,
619 struct page *page, pte_t *pte, bool write, bool anon);
623 * Multiple processes may "see" the same page. E.g. for untouched
624 * mappings of /dev/null, all processes see the same page full of
625 * zeroes, and text pages of executables and shared libraries have
626 * only one copy in memory, at most, normally.
628 * For the non-reserved pages, page_count(page) denotes a reference count.
629 * page_count() == 0 means the page is free. page->lru is then used for
630 * freelist management in the buddy allocator.
631 * page_count() > 0 means the page has been allocated.
633 * Pages are allocated by the slab allocator in order to provide memory
634 * to kmalloc and kmem_cache_alloc. In this case, the management of the
635 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
636 * unless a particular usage is carefully commented. (the responsibility of
637 * freeing the kmalloc memory is the caller's, of course).
639 * A page may be used by anyone else who does a __get_free_page().
640 * In this case, page_count still tracks the references, and should only
641 * be used through the normal accessor functions. The top bits of page->flags
642 * and page->virtual store page management information, but all other fields
643 * are unused and could be used privately, carefully. The management of this
644 * page is the responsibility of the one who allocated it, and those who have
645 * subsequently been given references to it.
647 * The other pages (we may call them "pagecache pages") are completely
648 * managed by the Linux memory manager: I/O, buffers, swapping etc.
649 * The following discussion applies only to them.
651 * A pagecache page contains an opaque `private' member, which belongs to the
652 * page's address_space. Usually, this is the address of a circular list of
653 * the page's disk buffers. PG_private must be set to tell the VM to call
654 * into the filesystem to release these pages.
656 * A page may belong to an inode's memory mapping. In this case, page->mapping
657 * is the pointer to the inode, and page->index is the file offset of the page,
658 * in units of PAGE_CACHE_SIZE.
660 * If pagecache pages are not associated with an inode, they are said to be
661 * anonymous pages. These may become associated with the swapcache, and in that
662 * case PG_swapcache is set, and page->private is an offset into the swapcache.
664 * In either case (swapcache or inode backed), the pagecache itself holds one
665 * reference to the page. Setting PG_private should also increment the
666 * refcount. The each user mapping also has a reference to the page.
668 * The pagecache pages are stored in a per-mapping radix tree, which is
669 * rooted at mapping->page_tree, and indexed by offset.
670 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
671 * lists, we instead now tag pages as dirty/writeback in the radix tree.
673 * All pagecache pages may be subject to I/O:
674 * - inode pages may need to be read from disk,
675 * - inode pages which have been modified and are MAP_SHARED may need
676 * to be written back to the inode on disk,
677 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
678 * modified may need to be swapped out to swap space and (later) to be read
683 * The zone field is never updated after free_area_init_core()
684 * sets it, so none of the operations on it need to be atomic.
687 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
688 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
689 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
690 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
691 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
694 * Define the bit shifts to access each section. For non-existent
695 * sections we define the shift as 0; that plus a 0 mask ensures
696 * the compiler will optimise away reference to them.
698 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
699 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
700 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
701 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
703 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
704 #ifdef NODE_NOT_IN_PAGE_FLAGS
705 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
706 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
707 SECTIONS_PGOFF : ZONES_PGOFF)
709 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
710 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
711 NODES_PGOFF : ZONES_PGOFF)
714 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
716 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
717 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
720 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
721 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
722 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
723 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
724 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
726 static inline enum zone_type page_zonenum(const struct page *page)
728 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
731 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
732 #define SECTION_IN_PAGE_FLAGS
736 * The identification function is mainly used by the buddy allocator for
737 * determining if two pages could be buddies. We are not really identifying
738 * the zone since we could be using the section number id if we do not have
739 * node id available in page flags.
740 * We only guarantee that it will return the same value for two combinable
743 static inline int page_zone_id(struct page *page)
745 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
748 static inline int zone_to_nid(struct zone *zone)
757 #ifdef NODE_NOT_IN_PAGE_FLAGS
758 extern int page_to_nid(const struct page *page);
760 static inline int page_to_nid(const struct page *page)
762 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
766 #ifdef CONFIG_NUMA_BALANCING
767 static inline int cpu_pid_to_cpupid(int cpu, int pid)
769 return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
772 static inline int cpupid_to_pid(int cpupid)
774 return cpupid & LAST__PID_MASK;
777 static inline int cpupid_to_cpu(int cpupid)
779 return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
782 static inline int cpupid_to_nid(int cpupid)
784 return cpu_to_node(cpupid_to_cpu(cpupid));
787 static inline bool cpupid_pid_unset(int cpupid)
789 return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
792 static inline bool cpupid_cpu_unset(int cpupid)
794 return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
797 static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
799 return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
802 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
803 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
804 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
806 return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
809 static inline int page_cpupid_last(struct page *page)
811 return page->_last_cpupid;
813 static inline void page_cpupid_reset_last(struct page *page)
815 page->_last_cpupid = -1 & LAST_CPUPID_MASK;
818 static inline int page_cpupid_last(struct page *page)
820 return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
823 extern int page_cpupid_xchg_last(struct page *page, int cpupid);
825 static inline void page_cpupid_reset_last(struct page *page)
827 int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
829 page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
830 page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
832 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
833 #else /* !CONFIG_NUMA_BALANCING */
834 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
836 return page_to_nid(page); /* XXX */
839 static inline int page_cpupid_last(struct page *page)
841 return page_to_nid(page); /* XXX */
844 static inline int cpupid_to_nid(int cpupid)
849 static inline int cpupid_to_pid(int cpupid)
854 static inline int cpupid_to_cpu(int cpupid)
859 static inline int cpu_pid_to_cpupid(int nid, int pid)
864 static inline bool cpupid_pid_unset(int cpupid)
869 static inline void page_cpupid_reset_last(struct page *page)
873 static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
877 #endif /* CONFIG_NUMA_BALANCING */
879 static inline struct zone *page_zone(const struct page *page)
881 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
884 #ifdef SECTION_IN_PAGE_FLAGS
885 static inline void set_page_section(struct page *page, unsigned long section)
887 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
888 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
891 static inline unsigned long page_to_section(const struct page *page)
893 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
897 static inline void set_page_zone(struct page *page, enum zone_type zone)
899 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
900 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
903 static inline void set_page_node(struct page *page, unsigned long node)
905 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
906 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
909 static inline void set_page_links(struct page *page, enum zone_type zone,
910 unsigned long node, unsigned long pfn)
912 set_page_zone(page, zone);
913 set_page_node(page, node);
914 #ifdef SECTION_IN_PAGE_FLAGS
915 set_page_section(page, pfn_to_section_nr(pfn));
920 * Some inline functions in vmstat.h depend on page_zone()
922 #include <linux/vmstat.h>
924 static __always_inline void *lowmem_page_address(const struct page *page)
926 return __va(PFN_PHYS(page_to_pfn(page)));
929 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
930 #define HASHED_PAGE_VIRTUAL
933 #if defined(WANT_PAGE_VIRTUAL)
934 static inline void *page_address(const struct page *page)
936 return page->virtual;
938 static inline void set_page_address(struct page *page, void *address)
940 page->virtual = address;
942 #define page_address_init() do { } while(0)
945 #if defined(HASHED_PAGE_VIRTUAL)
946 void *page_address(const struct page *page);
947 void set_page_address(struct page *page, void *virtual);
948 void page_address_init(void);
951 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
952 #define page_address(page) lowmem_page_address(page)
953 #define set_page_address(page, address) do { } while(0)
954 #define page_address_init() do { } while(0)
957 extern void *page_rmapping(struct page *page);
958 extern struct anon_vma *page_anon_vma(struct page *page);
959 extern struct address_space *page_mapping(struct page *page);
961 extern struct address_space *__page_file_mapping(struct page *);
964 struct address_space *page_file_mapping(struct page *page)
966 if (unlikely(PageSwapCache(page)))
967 return __page_file_mapping(page);
969 return page->mapping;
973 * Return the pagecache index of the passed page. Regular pagecache pages
974 * use ->index whereas swapcache pages use ->private
976 static inline pgoff_t page_index(struct page *page)
978 if (unlikely(PageSwapCache(page)))
979 return page_private(page);
983 extern pgoff_t __page_file_index(struct page *page);
986 * Return the file index of the page. Regular pagecache pages use ->index
987 * whereas swapcache pages use swp_offset(->private)
989 static inline pgoff_t page_file_index(struct page *page)
991 if (unlikely(PageSwapCache(page)))
992 return __page_file_index(page);
998 * Return true if this page is mapped into pagetables.
1000 static inline int page_mapped(struct page *page)
1002 return atomic_read(&(page)->_mapcount) >= 0;
1006 * Different kinds of faults, as returned by handle_mm_fault().
1007 * Used to decide whether a process gets delivered SIGBUS or
1008 * just gets major/minor fault counters bumped up.
1011 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1013 #define VM_FAULT_OOM 0x0001
1014 #define VM_FAULT_SIGBUS 0x0002
1015 #define VM_FAULT_MAJOR 0x0004
1016 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1017 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1018 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1019 #define VM_FAULT_SIGSEGV 0x0040
1021 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1022 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1023 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1024 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1026 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1028 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1029 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1032 /* Encode hstate index for a hwpoisoned large page */
1033 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1034 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1037 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1039 extern void pagefault_out_of_memory(void);
1041 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1044 * Flags passed to show_mem() and show_free_areas() to suppress output in
1047 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1049 extern void show_free_areas(unsigned int flags);
1050 extern bool skip_free_areas_node(unsigned int flags, int nid);
1052 int shmem_zero_setup(struct vm_area_struct *);
1054 bool shmem_mapping(struct address_space *mapping);
1056 static inline bool shmem_mapping(struct address_space *mapping)
1062 extern int can_do_mlock(void);
1063 extern int user_shm_lock(size_t, struct user_struct *);
1064 extern void user_shm_unlock(size_t, struct user_struct *);
1067 * Parameter block passed down to zap_pte_range in exceptional cases.
1069 struct zap_details {
1070 struct address_space *check_mapping; /* Check page->mapping if set */
1071 pgoff_t first_index; /* Lowest page->index to unmap */
1072 pgoff_t last_index; /* Highest page->index to unmap */
1075 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
1078 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1079 unsigned long size);
1080 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
1081 unsigned long size, struct zap_details *);
1082 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
1083 unsigned long start, unsigned long end);
1086 * mm_walk - callbacks for walk_page_range
1087 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1088 * this handler is required to be able to handle
1089 * pmd_trans_huge() pmds. They may simply choose to
1090 * split_huge_page() instead of handling it explicitly.
1091 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1092 * @pte_hole: if set, called for each hole at all levels
1093 * @hugetlb_entry: if set, called for each hugetlb entry
1094 * @test_walk: caller specific callback function to determine whether
1095 * we walk over the current vma or not. A positive returned
1096 * value means "do page table walk over the current vma,"
1097 * and a negative one means "abort current page table walk
1098 * right now." 0 means "skip the current vma."
1099 * @mm: mm_struct representing the target process of page table walk
1100 * @vma: vma currently walked (NULL if walking outside vmas)
1101 * @private: private data for callbacks' usage
1103 * (see the comment on walk_page_range() for more details)
1106 int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1107 unsigned long next, struct mm_walk *walk);
1108 int (*pte_entry)(pte_t *pte, unsigned long addr,
1109 unsigned long next, struct mm_walk *walk);
1110 int (*pte_hole)(unsigned long addr, unsigned long next,
1111 struct mm_walk *walk);
1112 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1113 unsigned long addr, unsigned long next,
1114 struct mm_walk *walk);
1115 int (*test_walk)(unsigned long addr, unsigned long next,
1116 struct mm_walk *walk);
1117 struct mm_struct *mm;
1118 struct vm_area_struct *vma;
1122 int walk_page_range(unsigned long addr, unsigned long end,
1123 struct mm_walk *walk);
1124 int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
1125 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1126 unsigned long end, unsigned long floor, unsigned long ceiling);
1127 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1128 struct vm_area_struct *vma);
1129 void unmap_mapping_range(struct address_space *mapping,
1130 loff_t const holebegin, loff_t const holelen, int even_cows);
1131 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1132 unsigned long *pfn);
1133 int follow_phys(struct vm_area_struct *vma, unsigned long address,
1134 unsigned int flags, unsigned long *prot, resource_size_t *phys);
1135 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1136 void *buf, int len, int write);
1138 static inline void unmap_shared_mapping_range(struct address_space *mapping,
1139 loff_t const holebegin, loff_t const holelen)
1141 unmap_mapping_range(mapping, holebegin, holelen, 0);
1144 extern void truncate_pagecache(struct inode *inode, loff_t new);
1145 extern void truncate_setsize(struct inode *inode, loff_t newsize);
1146 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
1147 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1148 int truncate_inode_page(struct address_space *mapping, struct page *page);
1149 int generic_error_remove_page(struct address_space *mapping, struct page *page);
1150 int invalidate_inode_page(struct page *page);
1153 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
1154 unsigned long address, unsigned int flags);
1155 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1156 unsigned long address, unsigned int fault_flags);
1158 static inline int handle_mm_fault(struct mm_struct *mm,
1159 struct vm_area_struct *vma, unsigned long address,
1162 /* should never happen if there's no MMU */
1164 return VM_FAULT_SIGBUS;
1166 static inline int fixup_user_fault(struct task_struct *tsk,
1167 struct mm_struct *mm, unsigned long address,
1168 unsigned int fault_flags)
1170 /* should never happen if there's no MMU */
1176 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
1177 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1178 void *buf, int len, int write);
1180 long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1181 unsigned long start, unsigned long nr_pages,
1182 unsigned int foll_flags, struct page **pages,
1183 struct vm_area_struct **vmas, int *nonblocking);
1184 long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1185 unsigned long start, unsigned long nr_pages,
1186 int write, int force, struct page **pages,
1187 struct vm_area_struct **vmas);
1188 long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm,
1189 unsigned long start, unsigned long nr_pages,
1190 int write, int force, struct page **pages,
1192 long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
1193 unsigned long start, unsigned long nr_pages,
1194 int write, int force, struct page **pages,
1195 unsigned int gup_flags);
1196 long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
1197 unsigned long start, unsigned long nr_pages,
1198 int write, int force, struct page **pages);
1199 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1200 struct page **pages);
1202 int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1203 struct page **pages);
1204 int get_kernel_page(unsigned long start, int write, struct page **pages);
1205 struct page *get_dump_page(unsigned long addr);
1207 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1208 extern void do_invalidatepage(struct page *page, unsigned int offset,
1209 unsigned int length);
1211 int __set_page_dirty_nobuffers(struct page *page);
1212 int __set_page_dirty_no_writeback(struct page *page);
1213 int redirty_page_for_writepage(struct writeback_control *wbc,
1215 void account_page_dirtied(struct page *page, struct address_space *mapping,
1216 struct mem_cgroup *memcg);
1217 void account_page_cleaned(struct page *page, struct address_space *mapping,
1218 struct mem_cgroup *memcg, struct bdi_writeback *wb);
1219 int set_page_dirty(struct page *page);
1220 int set_page_dirty_lock(struct page *page);
1221 void cancel_dirty_page(struct page *page);
1222 int clear_page_dirty_for_io(struct page *page);
1224 int get_cmdline(struct task_struct *task, char *buffer, int buflen);
1226 /* Is the vma a continuation of the stack vma above it? */
1227 static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1229 return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
1232 static inline int stack_guard_page_start(struct vm_area_struct *vma,
1235 return (vma->vm_flags & VM_GROWSDOWN) &&
1236 (vma->vm_start == addr) &&
1237 !vma_growsdown(vma->vm_prev, addr);
1240 /* Is the vma a continuation of the stack vma below it? */
1241 static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
1243 return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
1246 static inline int stack_guard_page_end(struct vm_area_struct *vma,
1249 return (vma->vm_flags & VM_GROWSUP) &&
1250 (vma->vm_end == addr) &&
1251 !vma_growsup(vma->vm_next, addr);
1254 extern struct task_struct *task_of_stack(struct task_struct *task,
1255 struct vm_area_struct *vma, bool in_group);
1257 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1258 unsigned long old_addr, struct vm_area_struct *new_vma,
1259 unsigned long new_addr, unsigned long len,
1260 bool need_rmap_locks);
1261 extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1262 unsigned long end, pgprot_t newprot,
1263 int dirty_accountable, int prot_numa);
1264 extern int mprotect_fixup(struct vm_area_struct *vma,
1265 struct vm_area_struct **pprev, unsigned long start,
1266 unsigned long end, unsigned long newflags);
1269 * doesn't attempt to fault and will return short.
1271 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1272 struct page **pages);
1274 * per-process(per-mm_struct) statistics.
1276 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1278 long val = atomic_long_read(&mm->rss_stat.count[member]);
1280 #ifdef SPLIT_RSS_COUNTING
1282 * counter is updated in asynchronous manner and may go to minus.
1283 * But it's never be expected number for users.
1288 return (unsigned long)val;
1291 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1293 atomic_long_add(value, &mm->rss_stat.count[member]);
1296 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1298 atomic_long_inc(&mm->rss_stat.count[member]);
1301 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1303 atomic_long_dec(&mm->rss_stat.count[member]);
1306 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1308 return get_mm_counter(mm, MM_FILEPAGES) +
1309 get_mm_counter(mm, MM_ANONPAGES);
1312 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1314 return max(mm->hiwater_rss, get_mm_rss(mm));
1317 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1319 return max(mm->hiwater_vm, mm->total_vm);
1322 static inline void update_hiwater_rss(struct mm_struct *mm)
1324 unsigned long _rss = get_mm_rss(mm);
1326 if ((mm)->hiwater_rss < _rss)
1327 (mm)->hiwater_rss = _rss;
1330 static inline void update_hiwater_vm(struct mm_struct *mm)
1332 if (mm->hiwater_vm < mm->total_vm)
1333 mm->hiwater_vm = mm->total_vm;
1336 static inline void reset_mm_hiwater_rss(struct mm_struct *mm)
1338 mm->hiwater_rss = get_mm_rss(mm);
1341 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1342 struct mm_struct *mm)
1344 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1346 if (*maxrss < hiwater_rss)
1347 *maxrss = hiwater_rss;
1350 #if defined(SPLIT_RSS_COUNTING)
1351 void sync_mm_rss(struct mm_struct *mm);
1353 static inline void sync_mm_rss(struct mm_struct *mm)
1358 int vma_wants_writenotify(struct vm_area_struct *vma);
1360 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1362 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1366 __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1370 #ifdef __PAGETABLE_PUD_FOLDED
1371 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1372 unsigned long address)
1377 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1380 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1381 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1382 unsigned long address)
1387 static inline void mm_nr_pmds_init(struct mm_struct *mm) {}
1389 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1394 static inline void mm_inc_nr_pmds(struct mm_struct *mm) {}
1395 static inline void mm_dec_nr_pmds(struct mm_struct *mm) {}
1398 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1400 static inline void mm_nr_pmds_init(struct mm_struct *mm)
1402 atomic_long_set(&mm->nr_pmds, 0);
1405 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1407 return atomic_long_read(&mm->nr_pmds);
1410 static inline void mm_inc_nr_pmds(struct mm_struct *mm)
1412 atomic_long_inc(&mm->nr_pmds);
1415 static inline void mm_dec_nr_pmds(struct mm_struct *mm)
1417 atomic_long_dec(&mm->nr_pmds);
1421 int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1422 pmd_t *pmd, unsigned long address);
1423 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1426 * The following ifdef needed to get the 4level-fixup.h header to work.
1427 * Remove it when 4level-fixup.h has been removed.
1429 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1430 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1432 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1433 NULL: pud_offset(pgd, address);
1436 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1438 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1439 NULL: pmd_offset(pud, address);
1441 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1443 #if USE_SPLIT_PTE_PTLOCKS
1444 #if ALLOC_SPLIT_PTLOCKS
1445 void __init ptlock_cache_init(void);
1446 extern bool ptlock_alloc(struct page *page);
1447 extern void ptlock_free(struct page *page);
1449 static inline spinlock_t *ptlock_ptr(struct page *page)
1453 #else /* ALLOC_SPLIT_PTLOCKS */
1454 static inline void ptlock_cache_init(void)
1458 static inline bool ptlock_alloc(struct page *page)
1463 static inline void ptlock_free(struct page *page)
1467 static inline spinlock_t *ptlock_ptr(struct page *page)
1471 #endif /* ALLOC_SPLIT_PTLOCKS */
1473 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1475 return ptlock_ptr(pmd_page(*pmd));
1478 static inline bool ptlock_init(struct page *page)
1481 * prep_new_page() initialize page->private (and therefore page->ptl)
1482 * with 0. Make sure nobody took it in use in between.
1484 * It can happen if arch try to use slab for page table allocation:
1485 * slab code uses page->slab_cache and page->first_page (for tail
1486 * pages), which share storage with page->ptl.
1488 VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
1489 if (!ptlock_alloc(page))
1491 spin_lock_init(ptlock_ptr(page));
1495 /* Reset page->mapping so free_pages_check won't complain. */
1496 static inline void pte_lock_deinit(struct page *page)
1498 page->mapping = NULL;
1502 #else /* !USE_SPLIT_PTE_PTLOCKS */
1504 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1506 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1508 return &mm->page_table_lock;
1510 static inline void ptlock_cache_init(void) {}
1511 static inline bool ptlock_init(struct page *page) { return true; }
1512 static inline void pte_lock_deinit(struct page *page) {}
1513 #endif /* USE_SPLIT_PTE_PTLOCKS */
1515 static inline void pgtable_init(void)
1517 ptlock_cache_init();
1518 pgtable_cache_init();
1521 static inline bool pgtable_page_ctor(struct page *page)
1523 inc_zone_page_state(page, NR_PAGETABLE);
1524 return ptlock_init(page);
1527 static inline void pgtable_page_dtor(struct page *page)
1529 pte_lock_deinit(page);
1530 dec_zone_page_state(page, NR_PAGETABLE);
1533 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1535 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1536 pte_t *__pte = pte_offset_map(pmd, address); \
1542 #define pte_unmap_unlock(pte, ptl) do { \
1547 #define pte_alloc_map(mm, vma, pmd, address) \
1548 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1550 NULL: pte_offset_map(pmd, address))
1552 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1553 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1555 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1557 #define pte_alloc_kernel(pmd, address) \
1558 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1559 NULL: pte_offset_kernel(pmd, address))
1561 #if USE_SPLIT_PMD_PTLOCKS
1563 static struct page *pmd_to_page(pmd_t *pmd)
1565 unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
1566 return virt_to_page((void *)((unsigned long) pmd & mask));
1569 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1571 return ptlock_ptr(pmd_to_page(pmd));
1574 static inline bool pgtable_pmd_page_ctor(struct page *page)
1576 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1577 page->pmd_huge_pte = NULL;
1579 return ptlock_init(page);
1582 static inline void pgtable_pmd_page_dtor(struct page *page)
1584 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1585 VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
1590 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1594 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1596 return &mm->page_table_lock;
1599 static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
1600 static inline void pgtable_pmd_page_dtor(struct page *page) {}
1602 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1606 static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
1608 spinlock_t *ptl = pmd_lockptr(mm, pmd);
1613 extern void free_area_init(unsigned long * zones_size);
1614 extern void free_area_init_node(int nid, unsigned long * zones_size,
1615 unsigned long zone_start_pfn, unsigned long *zholes_size);
1616 extern void free_initmem(void);
1619 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1620 * into the buddy system. The freed pages will be poisoned with pattern
1621 * "poison" if it's within range [0, UCHAR_MAX].
1622 * Return pages freed into the buddy system.
1624 extern unsigned long free_reserved_area(void *start, void *end,
1625 int poison, char *s);
1627 #ifdef CONFIG_HIGHMEM
1629 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1630 * and totalram_pages.
1632 extern void free_highmem_page(struct page *page);
1635 extern void adjust_managed_page_count(struct page *page, long count);
1636 extern void mem_init_print_info(const char *str);
1638 extern void reserve_bootmem_region(unsigned long start, unsigned long end);
1640 /* Free the reserved page into the buddy system, so it gets managed. */
1641 static inline void __free_reserved_page(struct page *page)
1643 ClearPageReserved(page);
1644 init_page_count(page);
1648 static inline void free_reserved_page(struct page *page)
1650 __free_reserved_page(page);
1651 adjust_managed_page_count(page, 1);
1654 static inline void mark_page_reserved(struct page *page)
1656 SetPageReserved(page);
1657 adjust_managed_page_count(page, -1);
1661 * Default method to free all the __init memory into the buddy system.
1662 * The freed pages will be poisoned with pattern "poison" if it's within
1663 * range [0, UCHAR_MAX].
1664 * Return pages freed into the buddy system.
1666 static inline unsigned long free_initmem_default(int poison)
1668 extern char __init_begin[], __init_end[];
1670 return free_reserved_area(&__init_begin, &__init_end,
1671 poison, "unused kernel");
1674 static inline unsigned long get_num_physpages(void)
1677 unsigned long phys_pages = 0;
1679 for_each_online_node(nid)
1680 phys_pages += node_present_pages(nid);
1685 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1687 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1688 * zones, allocate the backing mem_map and account for memory holes in a more
1689 * architecture independent manner. This is a substitute for creating the
1690 * zone_sizes[] and zholes_size[] arrays and passing them to
1691 * free_area_init_node()
1693 * An architecture is expected to register range of page frames backed by
1694 * physical memory with memblock_add[_node]() before calling
1695 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1696 * usage, an architecture is expected to do something like
1698 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1700 * for_each_valid_physical_page_range()
1701 * memblock_add_node(base, size, nid)
1702 * free_area_init_nodes(max_zone_pfns);
1704 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1705 * registered physical page range. Similarly
1706 * sparse_memory_present_with_active_regions() calls memory_present() for
1707 * each range when SPARSEMEM is enabled.
1709 * See mm/page_alloc.c for more information on each function exposed by
1710 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1712 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1713 unsigned long node_map_pfn_alignment(void);
1714 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1715 unsigned long end_pfn);
1716 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1717 unsigned long end_pfn);
1718 extern void get_pfn_range_for_nid(unsigned int nid,
1719 unsigned long *start_pfn, unsigned long *end_pfn);
1720 extern unsigned long find_min_pfn_with_active_regions(void);
1721 extern void free_bootmem_with_active_regions(int nid,
1722 unsigned long max_low_pfn);
1723 extern void sparse_memory_present_with_active_regions(int nid);
1725 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1727 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1728 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1729 static inline int __early_pfn_to_nid(unsigned long pfn,
1730 struct mminit_pfnnid_cache *state)
1735 /* please see mm/page_alloc.c */
1736 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1737 /* there is a per-arch backend function. */
1738 extern int __meminit __early_pfn_to_nid(unsigned long pfn,
1739 struct mminit_pfnnid_cache *state);
1742 extern void set_dma_reserve(unsigned long new_dma_reserve);
1743 extern void memmap_init_zone(unsigned long, int, unsigned long,
1744 unsigned long, enum memmap_context);
1745 extern void setup_per_zone_wmarks(void);
1746 extern int __meminit init_per_zone_wmark_min(void);
1747 extern void mem_init(void);
1748 extern void __init mmap_init(void);
1749 extern void show_mem(unsigned int flags);
1750 extern void si_meminfo(struct sysinfo * val);
1751 extern void si_meminfo_node(struct sysinfo *val, int nid);
1753 extern __printf(3, 4)
1754 void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
1756 extern void setup_per_cpu_pageset(void);
1758 extern void zone_pcp_update(struct zone *zone);
1759 extern void zone_pcp_reset(struct zone *zone);
1762 extern int min_free_kbytes;
1765 extern atomic_long_t mmap_pages_allocated;
1766 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1768 /* interval_tree.c */
1769 void vma_interval_tree_insert(struct vm_area_struct *node,
1770 struct rb_root *root);
1771 void vma_interval_tree_insert_after(struct vm_area_struct *node,
1772 struct vm_area_struct *prev,
1773 struct rb_root *root);
1774 void vma_interval_tree_remove(struct vm_area_struct *node,
1775 struct rb_root *root);
1776 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1777 unsigned long start, unsigned long last);
1778 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1779 unsigned long start, unsigned long last);
1781 #define vma_interval_tree_foreach(vma, root, start, last) \
1782 for (vma = vma_interval_tree_iter_first(root, start, last); \
1783 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1785 void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1786 struct rb_root *root);
1787 void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1788 struct rb_root *root);
1789 struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1790 struct rb_root *root, unsigned long start, unsigned long last);
1791 struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1792 struct anon_vma_chain *node, unsigned long start, unsigned long last);
1793 #ifdef CONFIG_DEBUG_VM_RB
1794 void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1797 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1798 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1799 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1802 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1803 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1804 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1805 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1806 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1807 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1808 struct mempolicy *);
1809 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1810 extern int split_vma(struct mm_struct *,
1811 struct vm_area_struct *, unsigned long addr, int new_below);
1812 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1813 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1814 struct rb_node **, struct rb_node *);
1815 extern void unlink_file_vma(struct vm_area_struct *);
1816 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1817 unsigned long addr, unsigned long len, pgoff_t pgoff,
1818 bool *need_rmap_locks);
1819 extern void exit_mmap(struct mm_struct *);
1821 static inline int check_data_rlimit(unsigned long rlim,
1823 unsigned long start,
1824 unsigned long end_data,
1825 unsigned long start_data)
1827 if (rlim < RLIM_INFINITY) {
1828 if (((new - start) + (end_data - start_data)) > rlim)
1835 extern int mm_take_all_locks(struct mm_struct *mm);
1836 extern void mm_drop_all_locks(struct mm_struct *mm);
1838 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1839 extern struct file *get_mm_exe_file(struct mm_struct *mm);
1841 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1842 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
1843 unsigned long addr, unsigned long len,
1844 unsigned long flags,
1845 const struct vm_special_mapping *spec);
1846 /* This is an obsolete alternative to _install_special_mapping. */
1847 extern int install_special_mapping(struct mm_struct *mm,
1848 unsigned long addr, unsigned long len,
1849 unsigned long flags, struct page **pages);
1851 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1853 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1854 unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
1855 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1856 unsigned long len, unsigned long prot, unsigned long flags,
1857 unsigned long pgoff, unsigned long *populate);
1858 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1861 extern int __mm_populate(unsigned long addr, unsigned long len,
1863 static inline void mm_populate(unsigned long addr, unsigned long len)
1866 (void) __mm_populate(addr, len, 1);
1869 static inline void mm_populate(unsigned long addr, unsigned long len) {}
1872 /* These take the mm semaphore themselves */
1873 extern unsigned long vm_brk(unsigned long, unsigned long);
1874 extern int vm_munmap(unsigned long, size_t);
1875 extern unsigned long vm_mmap(struct file *, unsigned long,
1876 unsigned long, unsigned long,
1877 unsigned long, unsigned long);
1879 struct vm_unmapped_area_info {
1880 #define VM_UNMAPPED_AREA_TOPDOWN 1
1881 unsigned long flags;
1882 unsigned long length;
1883 unsigned long low_limit;
1884 unsigned long high_limit;
1885 unsigned long align_mask;
1886 unsigned long align_offset;
1889 extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
1890 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
1893 * Search for an unmapped address range.
1895 * We are looking for a range that:
1896 * - does not intersect with any VMA;
1897 * - is contained within the [low_limit, high_limit) interval;
1898 * - is at least the desired size.
1899 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1901 static inline unsigned long
1902 vm_unmapped_area(struct vm_unmapped_area_info *info)
1904 if (info->flags & VM_UNMAPPED_AREA_TOPDOWN)
1905 return unmapped_area_topdown(info);
1907 return unmapped_area(info);
1911 extern void truncate_inode_pages(struct address_space *, loff_t);
1912 extern void truncate_inode_pages_range(struct address_space *,
1913 loff_t lstart, loff_t lend);
1914 extern void truncate_inode_pages_final(struct address_space *);
1916 /* generic vm_area_ops exported for stackable file systems */
1917 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1918 extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
1919 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1921 /* mm/page-writeback.c */
1922 int write_one_page(struct page *page, int wait);
1923 void task_dirty_inc(struct task_struct *tsk);
1926 #define VM_MAX_READAHEAD 128 /* kbytes */
1927 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1929 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1930 pgoff_t offset, unsigned long nr_to_read);
1932 void page_cache_sync_readahead(struct address_space *mapping,
1933 struct file_ra_state *ra,
1936 unsigned long size);
1938 void page_cache_async_readahead(struct address_space *mapping,
1939 struct file_ra_state *ra,
1943 unsigned long size);
1945 unsigned long max_sane_readahead(unsigned long nr);
1947 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1948 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1950 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1951 extern int expand_downwards(struct vm_area_struct *vma,
1952 unsigned long address);
1954 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1956 #define expand_upwards(vma, address) (0)
1959 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1960 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1961 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1962 struct vm_area_struct **pprev);
1964 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1965 NULL if none. Assume start_addr < end_addr. */
1966 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1968 struct vm_area_struct * vma = find_vma(mm,start_addr);
1970 if (vma && end_addr <= vma->vm_start)
1975 static inline unsigned long vma_pages(struct vm_area_struct *vma)
1977 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
1980 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1981 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
1982 unsigned long vm_start, unsigned long vm_end)
1984 struct vm_area_struct *vma = find_vma(mm, vm_start);
1986 if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
1993 pgprot_t vm_get_page_prot(unsigned long vm_flags);
1994 void vma_set_page_prot(struct vm_area_struct *vma);
1996 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
2000 static inline void vma_set_page_prot(struct vm_area_struct *vma)
2002 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
2006 #ifdef CONFIG_NUMA_BALANCING
2007 unsigned long change_prot_numa(struct vm_area_struct *vma,
2008 unsigned long start, unsigned long end);
2011 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
2012 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
2013 unsigned long pfn, unsigned long size, pgprot_t);
2014 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
2015 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
2017 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
2019 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
2022 struct page *follow_page_mask(struct vm_area_struct *vma,
2023 unsigned long address, unsigned int foll_flags,
2024 unsigned int *page_mask);
2026 static inline struct page *follow_page(struct vm_area_struct *vma,
2027 unsigned long address, unsigned int foll_flags)
2029 unsigned int unused_page_mask;
2030 return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
2033 #define FOLL_WRITE 0x01 /* check pte is writable */
2034 #define FOLL_TOUCH 0x02 /* mark page accessed */
2035 #define FOLL_GET 0x04 /* do get_page on page */
2036 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2037 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2038 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2039 * and return without waiting upon it */
2040 #define FOLL_POPULATE 0x40 /* fault in page */
2041 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2042 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2043 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2044 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2045 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2047 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
2049 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
2050 unsigned long size, pte_fn_t fn, void *data);
2052 #ifdef CONFIG_PROC_FS
2053 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
2055 static inline void vm_stat_account(struct mm_struct *mm,
2056 unsigned long flags, struct file *file, long pages)
2058 mm->total_vm += pages;
2060 #endif /* CONFIG_PROC_FS */
2062 #ifdef CONFIG_DEBUG_PAGEALLOC
2063 extern bool _debug_pagealloc_enabled;
2064 extern void __kernel_map_pages(struct page *page, int numpages, int enable);
2066 static inline bool debug_pagealloc_enabled(void)
2068 return _debug_pagealloc_enabled;
2072 kernel_map_pages(struct page *page, int numpages, int enable)
2074 if (!debug_pagealloc_enabled())
2077 __kernel_map_pages(page, numpages, enable);
2079 #ifdef CONFIG_HIBERNATION
2080 extern bool kernel_page_present(struct page *page);
2081 #endif /* CONFIG_HIBERNATION */
2084 kernel_map_pages(struct page *page, int numpages, int enable) {}
2085 #ifdef CONFIG_HIBERNATION
2086 static inline bool kernel_page_present(struct page *page) { return true; }
2087 #endif /* CONFIG_HIBERNATION */
2090 #ifdef __HAVE_ARCH_GATE_AREA
2091 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
2092 extern int in_gate_area_no_mm(unsigned long addr);
2093 extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
2095 static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
2099 static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
2100 static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
2104 #endif /* __HAVE_ARCH_GATE_AREA */
2106 #ifdef CONFIG_SYSCTL
2107 extern int sysctl_drop_caches;
2108 int drop_caches_sysctl_handler(struct ctl_table *, int,
2109 void __user *, size_t *, loff_t *);
2112 void drop_slab(void);
2113 void drop_slab_node(int nid);
2116 #define randomize_va_space 0
2118 extern int randomize_va_space;
2121 const char * arch_vma_name(struct vm_area_struct *vma);
2122 void print_vma_addr(char *prefix, unsigned long rip);
2124 void sparse_mem_maps_populate_node(struct page **map_map,
2125 unsigned long pnum_begin,
2126 unsigned long pnum_end,
2127 unsigned long map_count,
2130 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
2131 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
2132 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
2133 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
2134 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
2135 void *vmemmap_alloc_block(unsigned long size, int node);
2136 void *vmemmap_alloc_block_buf(unsigned long size, int node);
2137 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
2138 int vmemmap_populate_basepages(unsigned long start, unsigned long end,
2140 int vmemmap_populate(unsigned long start, unsigned long end, int node);
2141 void vmemmap_populate_print_last(void);
2142 #ifdef CONFIG_MEMORY_HOTPLUG
2143 void vmemmap_free(unsigned long start, unsigned long end);
2145 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
2146 unsigned long size);
2149 MF_COUNT_INCREASED = 1 << 0,
2150 MF_ACTION_REQUIRED = 1 << 1,
2151 MF_MUST_KILL = 1 << 2,
2152 MF_SOFT_OFFLINE = 1 << 3,
2154 extern int memory_failure(unsigned long pfn, int trapno, int flags);
2155 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
2156 extern int unpoison_memory(unsigned long pfn);
2157 extern int get_hwpoison_page(struct page *page);
2158 extern int sysctl_memory_failure_early_kill;
2159 extern int sysctl_memory_failure_recovery;
2160 extern void shake_page(struct page *p, int access);
2161 extern atomic_long_t num_poisoned_pages;
2162 extern int soft_offline_page(struct page *page, int flags);
2166 * Error handlers for various types of pages.
2169 MF_IGNORED, /* Error: cannot be handled */
2170 MF_FAILED, /* Error: handling failed */
2171 MF_DELAYED, /* Will be handled later */
2172 MF_RECOVERED, /* Successfully recovered */
2175 enum mf_action_page_type {
2177 MF_MSG_KERNEL_HIGH_ORDER,
2179 MF_MSG_DIFFERENT_COMPOUND,
2180 MF_MSG_POISONED_HUGE,
2183 MF_MSG_UNMAP_FAILED,
2184 MF_MSG_DIRTY_SWAPCACHE,
2185 MF_MSG_CLEAN_SWAPCACHE,
2186 MF_MSG_DIRTY_MLOCKED_LRU,
2187 MF_MSG_CLEAN_MLOCKED_LRU,
2188 MF_MSG_DIRTY_UNEVICTABLE_LRU,
2189 MF_MSG_CLEAN_UNEVICTABLE_LRU,
2192 MF_MSG_TRUNCATED_LRU,
2198 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2199 extern void clear_huge_page(struct page *page,
2201 unsigned int pages_per_huge_page);
2202 extern void copy_user_huge_page(struct page *dst, struct page *src,
2203 unsigned long addr, struct vm_area_struct *vma,
2204 unsigned int pages_per_huge_page);
2205 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2207 extern struct page_ext_operations debug_guardpage_ops;
2208 extern struct page_ext_operations page_poisoning_ops;
2210 #ifdef CONFIG_DEBUG_PAGEALLOC
2211 extern unsigned int _debug_guardpage_minorder;
2212 extern bool _debug_guardpage_enabled;
2214 static inline unsigned int debug_guardpage_minorder(void)
2216 return _debug_guardpage_minorder;
2219 static inline bool debug_guardpage_enabled(void)
2221 return _debug_guardpage_enabled;
2224 static inline bool page_is_guard(struct page *page)
2226 struct page_ext *page_ext;
2228 if (!debug_guardpage_enabled())
2231 page_ext = lookup_page_ext(page);
2232 return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
2235 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2236 static inline bool debug_guardpage_enabled(void) { return false; }
2237 static inline bool page_is_guard(struct page *page) { return false; }
2238 #endif /* CONFIG_DEBUG_PAGEALLOC */
2240 #if MAX_NUMNODES > 1
2241 void __init setup_nr_node_ids(void);
2243 static inline void setup_nr_node_ids(void) {}
2246 #endif /* __KERNEL__ */
2247 #endif /* _LINUX_MM_H */