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>
23 #include <linux/err.h>
27 struct anon_vma_chain;
30 struct writeback_control;
33 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
34 extern unsigned long max_mapnr;
36 static inline void set_max_mapnr(unsigned long limit)
41 static inline void set_max_mapnr(unsigned long limit) { }
44 extern unsigned long totalram_pages;
45 extern void * high_memory;
46 extern int page_cluster;
49 extern int sysctl_legacy_va_layout;
51 #define sysctl_legacy_va_layout 0
54 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
55 extern const int mmap_rnd_bits_min;
56 extern const int mmap_rnd_bits_max;
57 extern int mmap_rnd_bits __read_mostly;
59 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
60 extern const int mmap_rnd_compat_bits_min;
61 extern const int mmap_rnd_compat_bits_max;
62 extern int mmap_rnd_compat_bits __read_mostly;
66 #include <asm/pgtable.h>
67 #include <asm/processor.h>
70 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
74 #define lm_alias(x) __va(__pa_symbol(x))
78 * To prevent common memory management code establishing
79 * a zero page mapping on a read fault.
80 * This macro should be defined within <asm/pgtable.h>.
81 * s390 does this to prevent multiplexing of hardware bits
82 * related to the physical page in case of virtualization.
84 #ifndef mm_forbids_zeropage
85 #define mm_forbids_zeropage(X) (0)
88 extern unsigned long sysctl_user_reserve_kbytes;
89 extern unsigned long sysctl_admin_reserve_kbytes;
91 extern int sysctl_overcommit_memory;
92 extern int sysctl_overcommit_ratio;
93 extern unsigned long sysctl_overcommit_kbytes;
95 extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *,
97 extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
100 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
102 /* to align the pointer to the (next) page boundary */
103 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
105 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
106 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
109 * Linux kernel virtual memory manager primitives.
110 * The idea being to have a "virtual" mm in the same way
111 * we have a virtual fs - giving a cleaner interface to the
112 * mm details, and allowing different kinds of memory mappings
113 * (from shared memory to executable loading to arbitrary
117 extern struct kmem_cache *vm_area_cachep;
120 extern struct rb_root nommu_region_tree;
121 extern struct rw_semaphore nommu_region_sem;
123 extern unsigned int kobjsize(const void *objp);
127 * vm_flags in vm_area_struct, see mm_types.h.
129 #define VM_NONE 0x00000000
131 #define VM_READ 0x00000001 /* currently active flags */
132 #define VM_WRITE 0x00000002
133 #define VM_EXEC 0x00000004
134 #define VM_SHARED 0x00000008
136 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
137 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
138 #define VM_MAYWRITE 0x00000020
139 #define VM_MAYEXEC 0x00000040
140 #define VM_MAYSHARE 0x00000080
142 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
143 #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
144 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
145 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
146 #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
148 #define VM_LOCKED 0x00002000
149 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
151 /* Used by sys_madvise() */
152 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
153 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
155 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
156 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
157 #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
158 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
159 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
160 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
161 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
162 #define VM_ARCH_2 0x02000000
163 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
165 #ifdef CONFIG_MEM_SOFT_DIRTY
166 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
168 # define VM_SOFTDIRTY 0
171 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
172 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
173 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
174 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
176 #if defined(CONFIG_X86)
177 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
178 #elif defined(CONFIG_PPC)
179 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
180 #elif defined(CONFIG_PARISC)
181 # define VM_GROWSUP VM_ARCH_1
182 #elif defined(CONFIG_METAG)
183 # define VM_GROWSUP VM_ARCH_1
184 #elif defined(CONFIG_IA64)
185 # define VM_GROWSUP VM_ARCH_1
186 #elif !defined(CONFIG_MMU)
187 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
190 #if defined(CONFIG_X86)
191 /* MPX specific bounds table or bounds directory */
192 # define VM_MPX VM_ARCH_2
196 # define VM_GROWSUP VM_NONE
199 /* Bits set in the VMA until the stack is in its final location */
200 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
202 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
203 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
206 #ifdef CONFIG_STACK_GROWSUP
207 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
209 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
213 * Special vmas that are non-mergable, non-mlock()able.
214 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
216 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
218 /* This mask defines which mm->def_flags a process can inherit its parent */
219 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
221 /* This mask is used to clear all the VMA flags used by mlock */
222 #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
225 * mapping from the currently active vm_flags protection bits (the
226 * low four bits) to a page protection mask..
228 extern pgprot_t protection_map[16];
230 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
231 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
232 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
233 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
234 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
235 #define FAULT_FLAG_TRIED 0x20 /* Second try */
236 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
239 * vm_fault is filled by the the pagefault handler and passed to the vma's
240 * ->fault function. The vma's ->fault is responsible for returning a bitmask
241 * of VM_FAULT_xxx flags that give details about how the fault was handled.
243 * pgoff should be used in favour of virtual_address, if possible.
246 unsigned int flags; /* FAULT_FLAG_xxx flags */
247 pgoff_t pgoff; /* Logical page offset based on vma */
248 void __user *virtual_address; /* Faulting virtual address */
250 struct page *cow_page; /* Handler may choose to COW */
251 struct page *page; /* ->fault handlers should return a
252 * page here, unless VM_FAULT_NOPAGE
253 * is set (which is also implied by
256 /* for ->map_pages() only */
257 pgoff_t max_pgoff; /* map pages for offset from pgoff till
258 * max_pgoff inclusive */
259 pte_t *pte; /* pte entry associated with ->pgoff */
263 * These are the virtual MM functions - opening of an area, closing and
264 * unmapping it (needed to keep files on disk up-to-date etc), pointer
265 * to the functions called when a no-page or a wp-page exception occurs.
267 struct vm_operations_struct {
268 void (*open)(struct vm_area_struct * area);
269 void (*close)(struct vm_area_struct * area);
270 int (*mremap)(struct vm_area_struct * area);
271 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
272 int (*pmd_fault)(struct vm_area_struct *, unsigned long address,
273 pmd_t *, unsigned int flags);
274 void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
276 /* notification that a previously read-only page is about to become
277 * writable, if an error is returned it will cause a SIGBUS */
278 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
280 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
281 int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
283 /* called by access_process_vm when get_user_pages() fails, typically
284 * for use by special VMAs that can switch between memory and hardware
286 int (*access)(struct vm_area_struct *vma, unsigned long addr,
287 void *buf, int len, int write);
289 /* Called by the /proc/PID/maps code to ask the vma whether it
290 * has a special name. Returning non-NULL will also cause this
291 * vma to be dumped unconditionally. */
292 const char *(*name)(struct vm_area_struct *vma);
296 * set_policy() op must add a reference to any non-NULL @new mempolicy
297 * to hold the policy upon return. Caller should pass NULL @new to
298 * remove a policy and fall back to surrounding context--i.e. do not
299 * install a MPOL_DEFAULT policy, nor the task or system default
302 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
305 * get_policy() op must add reference [mpol_get()] to any policy at
306 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
307 * in mm/mempolicy.c will do this automatically.
308 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
309 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
310 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
311 * must return NULL--i.e., do not "fallback" to task or system default
314 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
318 * Called by vm_normal_page() for special PTEs to find the
319 * page for @addr. This is useful if the default behavior
320 * (using pte_page()) would not find the correct page.
322 struct page *(*find_special_page)(struct vm_area_struct *vma,
329 #define page_private(page) ((page)->private)
330 #define set_page_private(page, v) ((page)->private = (v))
333 * FIXME: take this include out, include page-flags.h in
334 * files which need it (119 of them)
336 #include <linux/page-flags.h>
337 #include <linux/huge_mm.h>
340 * Methods to modify the page usage count.
342 * What counts for a page usage:
343 * - cache mapping (page->mapping)
344 * - private data (page->private)
345 * - page mapped in a task's page tables, each mapping
346 * is counted separately
348 * Also, many kernel routines increase the page count before a critical
349 * routine so they can be sure the page doesn't go away from under them.
353 * Drop a ref, return true if the refcount fell to zero (the page has no users)
355 static inline int put_page_testzero(struct page *page)
357 VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page);
358 return atomic_dec_and_test(&page->_count);
362 * Try to grab a ref unless the page has a refcount of zero, return false if
364 * This can be called when MMU is off so it must not access
365 * any of the virtual mappings.
367 static inline int get_page_unless_zero(struct page *page)
369 return atomic_inc_not_zero(&page->_count);
372 extern int page_is_ram(unsigned long pfn);
380 int region_intersects(resource_size_t offset, size_t size, const char *type);
382 /* Support for virtually mapped pages */
383 struct page *vmalloc_to_page(const void *addr);
384 unsigned long vmalloc_to_pfn(const void *addr);
387 * Determine if an address is within the vmalloc range
389 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
390 * is no special casing required.
392 static inline int is_vmalloc_addr(const void *x)
395 unsigned long addr = (unsigned long)x;
397 return addr >= VMALLOC_START && addr < VMALLOC_END;
403 extern int is_vmalloc_or_module_addr(const void *x);
405 static inline int is_vmalloc_or_module_addr(const void *x)
411 extern void kvfree(const void *addr);
413 static inline void compound_lock(struct page *page)
415 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
416 VM_BUG_ON_PAGE(PageSlab(page), page);
417 bit_spin_lock(PG_compound_lock, &page->flags);
421 static inline void compound_unlock(struct page *page)
423 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
424 VM_BUG_ON_PAGE(PageSlab(page), page);
425 bit_spin_unlock(PG_compound_lock, &page->flags);
429 static inline unsigned long compound_lock_irqsave(struct page *page)
431 unsigned long uninitialized_var(flags);
432 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
433 local_irq_save(flags);
439 static inline void compound_unlock_irqrestore(struct page *page,
442 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
443 compound_unlock(page);
444 local_irq_restore(flags);
449 * The atomic page->_mapcount, starts from -1: so that transitions
450 * both from it and to it can be tracked, using atomic_inc_and_test
451 * and atomic_add_negative(-1).
453 static inline void page_mapcount_reset(struct page *page)
455 atomic_set(&(page)->_mapcount, -1);
458 static inline int page_mapcount(struct page *page)
460 VM_BUG_ON_PAGE(PageSlab(page), page);
461 return atomic_read(&page->_mapcount) + 1;
464 static inline int page_count(struct page *page)
466 return atomic_read(&compound_head(page)->_count);
469 static inline bool __compound_tail_refcounted(struct page *page)
471 return PageAnon(page) && !PageSlab(page) && !PageHeadHuge(page);
475 * This takes a head page as parameter and tells if the
476 * tail page reference counting can be skipped.
478 * For this to be safe, PageSlab and PageHeadHuge must remain true on
479 * any given page where they return true here, until all tail pins
480 * have been released.
482 static inline bool compound_tail_refcounted(struct page *page)
484 VM_BUG_ON_PAGE(!PageHead(page), page);
485 return __compound_tail_refcounted(page);
488 static inline void get_huge_page_tail(struct page *page)
491 * __split_huge_page_refcount() cannot run from under us.
493 VM_BUG_ON_PAGE(!PageTail(page), page);
494 VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
495 VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page);
496 if (compound_tail_refcounted(compound_head(page)))
497 atomic_inc(&page->_mapcount);
500 extern bool __get_page_tail(struct page *page);
502 static inline void get_page(struct page *page)
504 if (unlikely(PageTail(page)))
505 if (likely(__get_page_tail(page)))
508 * Getting a normal page or the head of a compound page
509 * requires to already have an elevated page->_count.
511 VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
512 atomic_inc(&page->_count);
515 static inline struct page *virt_to_head_page(const void *x)
517 struct page *page = virt_to_page(x);
519 return compound_head(page);
523 * Setup the page count before being freed into the page allocator for
524 * the first time (boot or memory hotplug)
526 static inline void init_page_count(struct page *page)
528 atomic_set(&page->_count, 1);
531 void put_page(struct page *page);
532 void put_pages_list(struct list_head *pages);
534 void split_page(struct page *page, unsigned int order);
535 int split_free_page(struct page *page);
538 * Compound pages have a destructor function. Provide a
539 * prototype for that function and accessor functions.
540 * These are _only_ valid on the head of a compound page.
542 typedef void compound_page_dtor(struct page *);
544 /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
545 enum compound_dtor_id {
548 #ifdef CONFIG_HUGETLB_PAGE
553 extern compound_page_dtor * const compound_page_dtors[];
555 static inline void set_compound_page_dtor(struct page *page,
556 enum compound_dtor_id compound_dtor)
558 VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page);
559 page[1].compound_dtor = compound_dtor;
562 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
564 VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page);
565 return compound_page_dtors[page[1].compound_dtor];
568 static inline unsigned int compound_order(struct page *page)
572 return page[1].compound_order;
575 static inline void set_compound_order(struct page *page, unsigned int order)
577 page[1].compound_order = order;
582 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
583 * servicing faults for write access. In the normal case, do always want
584 * pte_mkwrite. But get_user_pages can cause write faults for mappings
585 * that do not have writing enabled, when used by access_process_vm.
587 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
589 if (likely(vma->vm_flags & VM_WRITE))
590 pte = pte_mkwrite(pte);
594 void do_set_pte(struct vm_area_struct *vma, unsigned long address,
595 struct page *page, pte_t *pte, bool write, bool anon);
599 * Multiple processes may "see" the same page. E.g. for untouched
600 * mappings of /dev/null, all processes see the same page full of
601 * zeroes, and text pages of executables and shared libraries have
602 * only one copy in memory, at most, normally.
604 * For the non-reserved pages, page_count(page) denotes a reference count.
605 * page_count() == 0 means the page is free. page->lru is then used for
606 * freelist management in the buddy allocator.
607 * page_count() > 0 means the page has been allocated.
609 * Pages are allocated by the slab allocator in order to provide memory
610 * to kmalloc and kmem_cache_alloc. In this case, the management of the
611 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
612 * unless a particular usage is carefully commented. (the responsibility of
613 * freeing the kmalloc memory is the caller's, of course).
615 * A page may be used by anyone else who does a __get_free_page().
616 * In this case, page_count still tracks the references, and should only
617 * be used through the normal accessor functions. The top bits of page->flags
618 * and page->virtual store page management information, but all other fields
619 * are unused and could be used privately, carefully. The management of this
620 * page is the responsibility of the one who allocated it, and those who have
621 * subsequently been given references to it.
623 * The other pages (we may call them "pagecache pages") are completely
624 * managed by the Linux memory manager: I/O, buffers, swapping etc.
625 * The following discussion applies only to them.
627 * A pagecache page contains an opaque `private' member, which belongs to the
628 * page's address_space. Usually, this is the address of a circular list of
629 * the page's disk buffers. PG_private must be set to tell the VM to call
630 * into the filesystem to release these pages.
632 * A page may belong to an inode's memory mapping. In this case, page->mapping
633 * is the pointer to the inode, and page->index is the file offset of the page,
634 * in units of PAGE_CACHE_SIZE.
636 * If pagecache pages are not associated with an inode, they are said to be
637 * anonymous pages. These may become associated with the swapcache, and in that
638 * case PG_swapcache is set, and page->private is an offset into the swapcache.
640 * In either case (swapcache or inode backed), the pagecache itself holds one
641 * reference to the page. Setting PG_private should also increment the
642 * refcount. The each user mapping also has a reference to the page.
644 * The pagecache pages are stored in a per-mapping radix tree, which is
645 * rooted at mapping->page_tree, and indexed by offset.
646 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
647 * lists, we instead now tag pages as dirty/writeback in the radix tree.
649 * All pagecache pages may be subject to I/O:
650 * - inode pages may need to be read from disk,
651 * - inode pages which have been modified and are MAP_SHARED may need
652 * to be written back to the inode on disk,
653 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
654 * modified may need to be swapped out to swap space and (later) to be read
659 * The zone field is never updated after free_area_init_core()
660 * sets it, so none of the operations on it need to be atomic.
663 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
664 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
665 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
666 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
667 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
670 * Define the bit shifts to access each section. For non-existent
671 * sections we define the shift as 0; that plus a 0 mask ensures
672 * the compiler will optimise away reference to them.
674 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
675 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
676 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
677 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
679 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
680 #ifdef NODE_NOT_IN_PAGE_FLAGS
681 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
682 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
683 SECTIONS_PGOFF : ZONES_PGOFF)
685 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
686 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
687 NODES_PGOFF : ZONES_PGOFF)
690 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
692 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
693 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
696 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
697 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
698 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
699 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
700 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
702 static inline enum zone_type page_zonenum(const struct page *page)
704 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
707 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
708 #define SECTION_IN_PAGE_FLAGS
712 * The identification function is mainly used by the buddy allocator for
713 * determining if two pages could be buddies. We are not really identifying
714 * the zone since we could be using the section number id if we do not have
715 * node id available in page flags.
716 * We only guarantee that it will return the same value for two combinable
719 static inline int page_zone_id(struct page *page)
721 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
724 static inline int zone_to_nid(struct zone *zone)
733 #ifdef NODE_NOT_IN_PAGE_FLAGS
734 extern int page_to_nid(const struct page *page);
736 static inline int page_to_nid(const struct page *page)
738 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
742 #ifdef CONFIG_NUMA_BALANCING
743 static inline int cpu_pid_to_cpupid(int cpu, int pid)
745 return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
748 static inline int cpupid_to_pid(int cpupid)
750 return cpupid & LAST__PID_MASK;
753 static inline int cpupid_to_cpu(int cpupid)
755 return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
758 static inline int cpupid_to_nid(int cpupid)
760 return cpu_to_node(cpupid_to_cpu(cpupid));
763 static inline bool cpupid_pid_unset(int cpupid)
765 return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
768 static inline bool cpupid_cpu_unset(int cpupid)
770 return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
773 static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
775 return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
778 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
779 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
780 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
782 return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
785 static inline int page_cpupid_last(struct page *page)
787 return page->_last_cpupid;
789 static inline void page_cpupid_reset_last(struct page *page)
791 page->_last_cpupid = -1 & LAST_CPUPID_MASK;
794 static inline int page_cpupid_last(struct page *page)
796 return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
799 extern int page_cpupid_xchg_last(struct page *page, int cpupid);
801 static inline void page_cpupid_reset_last(struct page *page)
803 int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
805 page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
806 page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
808 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
809 #else /* !CONFIG_NUMA_BALANCING */
810 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
812 return page_to_nid(page); /* XXX */
815 static inline int page_cpupid_last(struct page *page)
817 return page_to_nid(page); /* XXX */
820 static inline int cpupid_to_nid(int cpupid)
825 static inline int cpupid_to_pid(int cpupid)
830 static inline int cpupid_to_cpu(int cpupid)
835 static inline int cpu_pid_to_cpupid(int nid, int pid)
840 static inline bool cpupid_pid_unset(int cpupid)
845 static inline void page_cpupid_reset_last(struct page *page)
849 static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
853 #endif /* CONFIG_NUMA_BALANCING */
855 static inline struct zone *page_zone(const struct page *page)
857 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
860 #ifdef SECTION_IN_PAGE_FLAGS
861 static inline void set_page_section(struct page *page, unsigned long section)
863 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
864 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
867 static inline unsigned long page_to_section(const struct page *page)
869 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
873 static inline void set_page_zone(struct page *page, enum zone_type zone)
875 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
876 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
879 static inline void set_page_node(struct page *page, unsigned long node)
881 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
882 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
885 static inline void set_page_links(struct page *page, enum zone_type zone,
886 unsigned long node, unsigned long pfn)
888 set_page_zone(page, zone);
889 set_page_node(page, node);
890 #ifdef SECTION_IN_PAGE_FLAGS
891 set_page_section(page, pfn_to_section_nr(pfn));
896 static inline struct mem_cgroup *page_memcg(struct page *page)
898 return page->mem_cgroup;
901 static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg)
903 page->mem_cgroup = memcg;
906 static inline struct mem_cgroup *page_memcg(struct page *page)
911 static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg)
917 * Some inline functions in vmstat.h depend on page_zone()
919 #include <linux/vmstat.h>
921 static __always_inline void *lowmem_page_address(const struct page *page)
923 return __va(PFN_PHYS(page_to_pfn(page)));
926 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
927 #define HASHED_PAGE_VIRTUAL
930 #if defined(WANT_PAGE_VIRTUAL)
931 static inline void *page_address(const struct page *page)
933 return page->virtual;
935 static inline void set_page_address(struct page *page, void *address)
937 page->virtual = address;
939 #define page_address_init() do { } while(0)
942 #if defined(HASHED_PAGE_VIRTUAL)
943 void *page_address(const struct page *page);
944 void set_page_address(struct page *page, void *virtual);
945 void page_address_init(void);
948 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
949 #define page_address(page) lowmem_page_address(page)
950 #define set_page_address(page, address) do { } while(0)
951 #define page_address_init() do { } while(0)
954 extern void *page_rmapping(struct page *page);
955 extern struct anon_vma *page_anon_vma(struct page *page);
956 extern struct address_space *page_mapping(struct page *page);
958 extern struct address_space *__page_file_mapping(struct page *);
961 struct address_space *page_file_mapping(struct page *page)
963 if (unlikely(PageSwapCache(page)))
964 return __page_file_mapping(page);
966 return page->mapping;
970 * Return the pagecache index of the passed page. Regular pagecache pages
971 * use ->index whereas swapcache pages use ->private
973 static inline pgoff_t page_index(struct page *page)
975 if (unlikely(PageSwapCache(page)))
976 return page_private(page);
980 extern pgoff_t __page_file_index(struct page *page);
983 * Return the file index of the page. Regular pagecache pages use ->index
984 * whereas swapcache pages use swp_offset(->private)
986 static inline pgoff_t page_file_index(struct page *page)
988 if (unlikely(PageSwapCache(page)))
989 return __page_file_index(page);
995 * Return true if this page is mapped into pagetables.
997 static inline int page_mapped(struct page *page)
999 return atomic_read(&(page)->_mapcount) >= 0;
1003 * Return true only if the page has been allocated with
1004 * ALLOC_NO_WATERMARKS and the low watermark was not
1005 * met implying that the system is under some pressure.
1007 static inline bool page_is_pfmemalloc(struct page *page)
1010 * Page index cannot be this large so this must be
1011 * a pfmemalloc page.
1013 return page->index == -1UL;
1017 * Only to be called by the page allocator on a freshly allocated
1020 static inline void set_page_pfmemalloc(struct page *page)
1025 static inline void clear_page_pfmemalloc(struct page *page)
1031 * Different kinds of faults, as returned by handle_mm_fault().
1032 * Used to decide whether a process gets delivered SIGBUS or
1033 * just gets major/minor fault counters bumped up.
1036 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1038 #define VM_FAULT_OOM 0x0001
1039 #define VM_FAULT_SIGBUS 0x0002
1040 #define VM_FAULT_MAJOR 0x0004
1041 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1042 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1043 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1044 #define VM_FAULT_SIGSEGV 0x0040
1046 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1047 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1048 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1049 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1051 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1053 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1054 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1057 /* Encode hstate index for a hwpoisoned large page */
1058 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1059 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1062 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1064 extern void pagefault_out_of_memory(void);
1066 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1069 * Flags passed to show_mem() and show_free_areas() to suppress output in
1072 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1074 extern void show_free_areas(unsigned int flags);
1075 extern bool skip_free_areas_node(unsigned int flags, int nid);
1077 void shmem_set_file(struct vm_area_struct *vma, struct file *file);
1078 int shmem_zero_setup(struct vm_area_struct *);
1080 bool shmem_mapping(struct address_space *mapping);
1082 static inline bool shmem_mapping(struct address_space *mapping)
1088 extern int can_do_mlock(void);
1089 extern int user_shm_lock(size_t, struct user_struct *);
1090 extern void user_shm_unlock(size_t, struct user_struct *);
1093 * Parameter block passed down to zap_pte_range in exceptional cases.
1095 struct zap_details {
1096 struct address_space *check_mapping; /* Check page->mapping if set */
1097 pgoff_t first_index; /* Lowest page->index to unmap */
1098 pgoff_t last_index; /* Highest page->index to unmap */
1101 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
1103 struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
1106 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1107 unsigned long size);
1108 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
1109 unsigned long size, struct zap_details *);
1110 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
1111 unsigned long start, unsigned long end);
1114 * mm_walk - callbacks for walk_page_range
1115 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1116 * this handler is required to be able to handle
1117 * pmd_trans_huge() pmds. They may simply choose to
1118 * split_huge_page() instead of handling it explicitly.
1119 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1120 * @pte_hole: if set, called for each hole at all levels
1121 * @hugetlb_entry: if set, called for each hugetlb entry
1122 * @test_walk: caller specific callback function to determine whether
1123 * we walk over the current vma or not. A positive returned
1124 * value means "do page table walk over the current vma,"
1125 * and a negative one means "abort current page table walk
1126 * right now." 0 means "skip the current vma."
1127 * @mm: mm_struct representing the target process of page table walk
1128 * @vma: vma currently walked (NULL if walking outside vmas)
1129 * @private: private data for callbacks' usage
1131 * (see the comment on walk_page_range() for more details)
1134 int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1135 unsigned long next, struct mm_walk *walk);
1136 int (*pte_entry)(pte_t *pte, unsigned long addr,
1137 unsigned long next, struct mm_walk *walk);
1138 int (*pte_hole)(unsigned long addr, unsigned long next,
1139 struct mm_walk *walk);
1140 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1141 unsigned long addr, unsigned long next,
1142 struct mm_walk *walk);
1143 int (*test_walk)(unsigned long addr, unsigned long next,
1144 struct mm_walk *walk);
1145 struct mm_struct *mm;
1146 struct vm_area_struct *vma;
1150 int walk_page_range(unsigned long addr, unsigned long end,
1151 struct mm_walk *walk);
1152 int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
1153 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1154 unsigned long end, unsigned long floor, unsigned long ceiling);
1155 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1156 struct vm_area_struct *vma);
1157 void unmap_mapping_range(struct address_space *mapping,
1158 loff_t const holebegin, loff_t const holelen, int even_cows);
1159 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1160 unsigned long *pfn);
1161 int follow_phys(struct vm_area_struct *vma, unsigned long address,
1162 unsigned int flags, unsigned long *prot, resource_size_t *phys);
1163 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1164 void *buf, int len, int write);
1166 static inline void unmap_shared_mapping_range(struct address_space *mapping,
1167 loff_t const holebegin, loff_t const holelen)
1169 unmap_mapping_range(mapping, holebegin, holelen, 0);
1172 extern void truncate_pagecache(struct inode *inode, loff_t new);
1173 extern void truncate_setsize(struct inode *inode, loff_t newsize);
1174 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
1175 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1176 int truncate_inode_page(struct address_space *mapping, struct page *page);
1177 int generic_error_remove_page(struct address_space *mapping, struct page *page);
1178 int invalidate_inode_page(struct page *page);
1181 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
1182 unsigned long address, unsigned int flags);
1183 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1184 unsigned long address, unsigned int fault_flags);
1186 static inline int handle_mm_fault(struct mm_struct *mm,
1187 struct vm_area_struct *vma, unsigned long address,
1190 /* should never happen if there's no MMU */
1192 return VM_FAULT_SIGBUS;
1194 static inline int fixup_user_fault(struct task_struct *tsk,
1195 struct mm_struct *mm, unsigned long address,
1196 unsigned int fault_flags)
1198 /* should never happen if there's no MMU */
1204 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
1205 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1206 void *buf, int len, int write);
1208 long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1209 unsigned long start, unsigned long nr_pages,
1210 unsigned int foll_flags, struct page **pages,
1211 struct vm_area_struct **vmas, int *nonblocking);
1212 long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1213 unsigned long start, unsigned long nr_pages,
1214 int write, int force, struct page **pages,
1215 struct vm_area_struct **vmas);
1216 long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm,
1217 unsigned long start, unsigned long nr_pages,
1218 int write, int force, struct page **pages,
1220 long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
1221 unsigned long start, unsigned long nr_pages,
1222 int write, int force, struct page **pages,
1223 unsigned int gup_flags);
1224 long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
1225 unsigned long start, unsigned long nr_pages,
1226 int write, int force, struct page **pages);
1227 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1228 struct page **pages);
1230 /* Container for pinned pfns / pages */
1231 struct frame_vector {
1232 unsigned int nr_allocated; /* Number of frames we have space for */
1233 unsigned int nr_frames; /* Number of frames stored in ptrs array */
1234 bool got_ref; /* Did we pin pages by getting page ref? */
1235 bool is_pfns; /* Does array contain pages or pfns? */
1236 void *ptrs[0]; /* Array of pinned pfns / pages. Use
1237 * pfns_vector_pages() or pfns_vector_pfns()
1241 struct frame_vector *frame_vector_create(unsigned int nr_frames);
1242 void frame_vector_destroy(struct frame_vector *vec);
1243 int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
1244 bool write, bool force, struct frame_vector *vec);
1245 void put_vaddr_frames(struct frame_vector *vec);
1246 int frame_vector_to_pages(struct frame_vector *vec);
1247 void frame_vector_to_pfns(struct frame_vector *vec);
1249 static inline unsigned int frame_vector_count(struct frame_vector *vec)
1251 return vec->nr_frames;
1254 static inline struct page **frame_vector_pages(struct frame_vector *vec)
1257 int err = frame_vector_to_pages(vec);
1260 return ERR_PTR(err);
1262 return (struct page **)(vec->ptrs);
1265 static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
1268 frame_vector_to_pfns(vec);
1269 return (unsigned long *)(vec->ptrs);
1273 int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1274 struct page **pages);
1275 int get_kernel_page(unsigned long start, int write, struct page **pages);
1276 struct page *get_dump_page(unsigned long addr);
1278 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1279 extern void do_invalidatepage(struct page *page, unsigned int offset,
1280 unsigned int length);
1282 int __set_page_dirty_nobuffers(struct page *page);
1283 int __set_page_dirty_no_writeback(struct page *page);
1284 int redirty_page_for_writepage(struct writeback_control *wbc,
1286 void account_page_dirtied(struct page *page, struct address_space *mapping,
1287 struct mem_cgroup *memcg);
1288 void account_page_cleaned(struct page *page, struct address_space *mapping,
1289 struct mem_cgroup *memcg, struct bdi_writeback *wb);
1290 int set_page_dirty(struct page *page);
1291 int set_page_dirty_lock(struct page *page);
1292 void cancel_dirty_page(struct page *page);
1293 int clear_page_dirty_for_io(struct page *page);
1295 int get_cmdline(struct task_struct *task, char *buffer, int buflen);
1297 static inline bool vma_is_anonymous(struct vm_area_struct *vma)
1299 return !vma->vm_ops;
1302 int vma_is_stack_for_task(struct vm_area_struct *vma, struct task_struct *t);
1304 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1305 unsigned long old_addr, struct vm_area_struct *new_vma,
1306 unsigned long new_addr, unsigned long len,
1307 bool need_rmap_locks);
1308 extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1309 unsigned long end, pgprot_t newprot,
1310 int dirty_accountable, int prot_numa);
1311 extern int mprotect_fixup(struct vm_area_struct *vma,
1312 struct vm_area_struct **pprev, unsigned long start,
1313 unsigned long end, unsigned long newflags);
1316 * doesn't attempt to fault and will return short.
1318 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1319 struct page **pages);
1321 * per-process(per-mm_struct) statistics.
1323 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1325 long val = atomic_long_read(&mm->rss_stat.count[member]);
1327 #ifdef SPLIT_RSS_COUNTING
1329 * counter is updated in asynchronous manner and may go to minus.
1330 * But it's never be expected number for users.
1335 return (unsigned long)val;
1338 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1340 atomic_long_add(value, &mm->rss_stat.count[member]);
1343 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1345 atomic_long_inc(&mm->rss_stat.count[member]);
1348 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1350 atomic_long_dec(&mm->rss_stat.count[member]);
1353 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1355 return get_mm_counter(mm, MM_FILEPAGES) +
1356 get_mm_counter(mm, MM_ANONPAGES);
1359 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1361 return max(mm->hiwater_rss, get_mm_rss(mm));
1364 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1366 return max(mm->hiwater_vm, mm->total_vm);
1369 static inline void update_hiwater_rss(struct mm_struct *mm)
1371 unsigned long _rss = get_mm_rss(mm);
1373 if ((mm)->hiwater_rss < _rss)
1374 (mm)->hiwater_rss = _rss;
1377 static inline void update_hiwater_vm(struct mm_struct *mm)
1379 if (mm->hiwater_vm < mm->total_vm)
1380 mm->hiwater_vm = mm->total_vm;
1383 static inline void reset_mm_hiwater_rss(struct mm_struct *mm)
1385 mm->hiwater_rss = get_mm_rss(mm);
1388 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1389 struct mm_struct *mm)
1391 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1393 if (*maxrss < hiwater_rss)
1394 *maxrss = hiwater_rss;
1397 #if defined(SPLIT_RSS_COUNTING)
1398 void sync_mm_rss(struct mm_struct *mm);
1400 static inline void sync_mm_rss(struct mm_struct *mm)
1405 int vma_wants_writenotify(struct vm_area_struct *vma);
1407 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1409 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1413 __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1417 #ifdef __PAGETABLE_PUD_FOLDED
1418 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1419 unsigned long address)
1424 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1427 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1428 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1429 unsigned long address)
1434 static inline void mm_nr_pmds_init(struct mm_struct *mm) {}
1436 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1441 static inline void mm_inc_nr_pmds(struct mm_struct *mm) {}
1442 static inline void mm_dec_nr_pmds(struct mm_struct *mm) {}
1445 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1447 static inline void mm_nr_pmds_init(struct mm_struct *mm)
1449 atomic_long_set(&mm->nr_pmds, 0);
1452 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1454 return atomic_long_read(&mm->nr_pmds);
1457 static inline void mm_inc_nr_pmds(struct mm_struct *mm)
1459 atomic_long_inc(&mm->nr_pmds);
1462 static inline void mm_dec_nr_pmds(struct mm_struct *mm)
1464 atomic_long_dec(&mm->nr_pmds);
1468 int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1469 pmd_t *pmd, unsigned long address);
1470 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1473 * The following ifdef needed to get the 4level-fixup.h header to work.
1474 * Remove it when 4level-fixup.h has been removed.
1476 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1477 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1479 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1480 NULL: pud_offset(pgd, address);
1483 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1485 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1486 NULL: pmd_offset(pud, address);
1488 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1490 #if USE_SPLIT_PTE_PTLOCKS
1491 #if ALLOC_SPLIT_PTLOCKS
1492 void __init ptlock_cache_init(void);
1493 extern bool ptlock_alloc(struct page *page);
1494 extern void ptlock_free(struct page *page);
1496 static inline spinlock_t *ptlock_ptr(struct page *page)
1500 #else /* ALLOC_SPLIT_PTLOCKS */
1501 static inline void ptlock_cache_init(void)
1505 static inline bool ptlock_alloc(struct page *page)
1510 static inline void ptlock_free(struct page *page)
1514 static inline spinlock_t *ptlock_ptr(struct page *page)
1518 #endif /* ALLOC_SPLIT_PTLOCKS */
1520 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1522 return ptlock_ptr(pmd_page(*pmd));
1525 static inline bool ptlock_init(struct page *page)
1528 * prep_new_page() initialize page->private (and therefore page->ptl)
1529 * with 0. Make sure nobody took it in use in between.
1531 * It can happen if arch try to use slab for page table allocation:
1532 * slab code uses page->slab_cache, which share storage with page->ptl.
1534 VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
1535 if (!ptlock_alloc(page))
1537 spin_lock_init(ptlock_ptr(page));
1541 /* Reset page->mapping so free_pages_check won't complain. */
1542 static inline void pte_lock_deinit(struct page *page)
1544 page->mapping = NULL;
1548 #else /* !USE_SPLIT_PTE_PTLOCKS */
1550 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1552 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1554 return &mm->page_table_lock;
1556 static inline void ptlock_cache_init(void) {}
1557 static inline bool ptlock_init(struct page *page) { return true; }
1558 static inline void pte_lock_deinit(struct page *page) {}
1559 #endif /* USE_SPLIT_PTE_PTLOCKS */
1561 static inline void pgtable_init(void)
1563 ptlock_cache_init();
1564 pgtable_cache_init();
1567 static inline bool pgtable_page_ctor(struct page *page)
1569 if (!ptlock_init(page))
1571 inc_zone_page_state(page, NR_PAGETABLE);
1575 static inline void pgtable_page_dtor(struct page *page)
1577 pte_lock_deinit(page);
1578 dec_zone_page_state(page, NR_PAGETABLE);
1581 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1583 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1584 pte_t *__pte = pte_offset_map(pmd, address); \
1590 #define pte_unmap_unlock(pte, ptl) do { \
1595 #define pte_alloc_map(mm, vma, pmd, address) \
1596 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1598 NULL: pte_offset_map(pmd, address))
1600 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1601 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1603 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1605 #define pte_alloc_kernel(pmd, address) \
1606 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1607 NULL: pte_offset_kernel(pmd, address))
1609 #if USE_SPLIT_PMD_PTLOCKS
1611 static struct page *pmd_to_page(pmd_t *pmd)
1613 unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
1614 return virt_to_page((void *)((unsigned long) pmd & mask));
1617 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1619 return ptlock_ptr(pmd_to_page(pmd));
1622 static inline bool pgtable_pmd_page_ctor(struct page *page)
1624 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1625 page->pmd_huge_pte = NULL;
1627 return ptlock_init(page);
1630 static inline void pgtable_pmd_page_dtor(struct page *page)
1632 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1633 VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
1638 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1642 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1644 return &mm->page_table_lock;
1647 static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
1648 static inline void pgtable_pmd_page_dtor(struct page *page) {}
1650 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1654 static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
1656 spinlock_t *ptl = pmd_lockptr(mm, pmd);
1661 extern void free_area_init(unsigned long * zones_size);
1662 extern void free_area_init_node(int nid, unsigned long * zones_size,
1663 unsigned long zone_start_pfn, unsigned long *zholes_size);
1664 extern void free_initmem(void);
1667 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1668 * into the buddy system. The freed pages will be poisoned with pattern
1669 * "poison" if it's within range [0, UCHAR_MAX].
1670 * Return pages freed into the buddy system.
1672 extern unsigned long free_reserved_area(void *start, void *end,
1673 int poison, char *s);
1675 #ifdef CONFIG_HIGHMEM
1677 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1678 * and totalram_pages.
1680 extern void free_highmem_page(struct page *page);
1683 extern void adjust_managed_page_count(struct page *page, long count);
1684 extern void mem_init_print_info(const char *str);
1686 extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end);
1688 /* Free the reserved page into the buddy system, so it gets managed. */
1689 static inline void __free_reserved_page(struct page *page)
1691 ClearPageReserved(page);
1692 init_page_count(page);
1696 static inline void free_reserved_page(struct page *page)
1698 __free_reserved_page(page);
1699 adjust_managed_page_count(page, 1);
1702 static inline void mark_page_reserved(struct page *page)
1704 SetPageReserved(page);
1705 adjust_managed_page_count(page, -1);
1709 * Default method to free all the __init memory into the buddy system.
1710 * The freed pages will be poisoned with pattern "poison" if it's within
1711 * range [0, UCHAR_MAX].
1712 * Return pages freed into the buddy system.
1714 static inline unsigned long free_initmem_default(int poison)
1716 extern char __init_begin[], __init_end[];
1718 return free_reserved_area(&__init_begin, &__init_end,
1719 poison, "unused kernel");
1722 static inline unsigned long get_num_physpages(void)
1725 unsigned long phys_pages = 0;
1727 for_each_online_node(nid)
1728 phys_pages += node_present_pages(nid);
1733 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1735 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1736 * zones, allocate the backing mem_map and account for memory holes in a more
1737 * architecture independent manner. This is a substitute for creating the
1738 * zone_sizes[] and zholes_size[] arrays and passing them to
1739 * free_area_init_node()
1741 * An architecture is expected to register range of page frames backed by
1742 * physical memory with memblock_add[_node]() before calling
1743 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1744 * usage, an architecture is expected to do something like
1746 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1748 * for_each_valid_physical_page_range()
1749 * memblock_add_node(base, size, nid)
1750 * free_area_init_nodes(max_zone_pfns);
1752 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1753 * registered physical page range. Similarly
1754 * sparse_memory_present_with_active_regions() calls memory_present() for
1755 * each range when SPARSEMEM is enabled.
1757 * See mm/page_alloc.c for more information on each function exposed by
1758 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1760 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1761 unsigned long node_map_pfn_alignment(void);
1762 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1763 unsigned long end_pfn);
1764 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1765 unsigned long end_pfn);
1766 extern void get_pfn_range_for_nid(unsigned int nid,
1767 unsigned long *start_pfn, unsigned long *end_pfn);
1768 extern unsigned long find_min_pfn_with_active_regions(void);
1769 extern void free_bootmem_with_active_regions(int nid,
1770 unsigned long max_low_pfn);
1771 extern void sparse_memory_present_with_active_regions(int nid);
1773 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1775 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1776 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1777 static inline int __early_pfn_to_nid(unsigned long pfn,
1778 struct mminit_pfnnid_cache *state)
1783 /* please see mm/page_alloc.c */
1784 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1785 /* there is a per-arch backend function. */
1786 extern int __meminit __early_pfn_to_nid(unsigned long pfn,
1787 struct mminit_pfnnid_cache *state);
1790 extern void set_dma_reserve(unsigned long new_dma_reserve);
1791 extern void memmap_init_zone(unsigned long, int, unsigned long,
1792 unsigned long, enum memmap_context);
1793 extern void setup_per_zone_wmarks(void);
1794 extern int __meminit init_per_zone_wmark_min(void);
1795 extern void mem_init(void);
1796 extern void __init mmap_init(void);
1797 extern void show_mem(unsigned int flags);
1798 extern void si_meminfo(struct sysinfo * val);
1799 extern void si_meminfo_node(struct sysinfo *val, int nid);
1801 extern __printf(3, 4)
1802 void warn_alloc_failed(gfp_t gfp_mask, unsigned int order,
1803 const char *fmt, ...);
1805 extern void setup_per_cpu_pageset(void);
1807 extern void zone_pcp_update(struct zone *zone);
1808 extern void zone_pcp_reset(struct zone *zone);
1811 extern int min_free_kbytes;
1814 extern atomic_long_t mmap_pages_allocated;
1815 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1817 /* interval_tree.c */
1818 void vma_interval_tree_insert(struct vm_area_struct *node,
1819 struct rb_root *root);
1820 void vma_interval_tree_insert_after(struct vm_area_struct *node,
1821 struct vm_area_struct *prev,
1822 struct rb_root *root);
1823 void vma_interval_tree_remove(struct vm_area_struct *node,
1824 struct rb_root *root);
1825 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1826 unsigned long start, unsigned long last);
1827 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1828 unsigned long start, unsigned long last);
1830 #define vma_interval_tree_foreach(vma, root, start, last) \
1831 for (vma = vma_interval_tree_iter_first(root, start, last); \
1832 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1834 void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1835 struct rb_root *root);
1836 void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1837 struct rb_root *root);
1838 struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1839 struct rb_root *root, unsigned long start, unsigned long last);
1840 struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1841 struct anon_vma_chain *node, unsigned long start, unsigned long last);
1842 #ifdef CONFIG_DEBUG_VM_RB
1843 void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1846 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1847 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1848 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1851 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1852 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1853 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1854 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1855 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1856 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1857 struct mempolicy *, struct vm_userfaultfd_ctx, const char __user *);
1858 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1859 extern int split_vma(struct mm_struct *,
1860 struct vm_area_struct *, unsigned long addr, int new_below);
1861 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1862 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1863 struct rb_node **, struct rb_node *);
1864 extern void unlink_file_vma(struct vm_area_struct *);
1865 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1866 unsigned long addr, unsigned long len, pgoff_t pgoff,
1867 bool *need_rmap_locks);
1868 extern void exit_mmap(struct mm_struct *);
1870 static inline int check_data_rlimit(unsigned long rlim,
1872 unsigned long start,
1873 unsigned long end_data,
1874 unsigned long start_data)
1876 if (rlim < RLIM_INFINITY) {
1877 if (((new - start) + (end_data - start_data)) > rlim)
1884 extern int mm_take_all_locks(struct mm_struct *mm);
1885 extern void mm_drop_all_locks(struct mm_struct *mm);
1887 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1888 extern struct file *get_mm_exe_file(struct mm_struct *mm);
1889 extern struct file *get_task_exe_file(struct task_struct *task);
1891 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1892 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
1893 unsigned long addr, unsigned long len,
1894 unsigned long flags,
1895 const struct vm_special_mapping *spec);
1896 /* This is an obsolete alternative to _install_special_mapping. */
1897 extern int install_special_mapping(struct mm_struct *mm,
1898 unsigned long addr, unsigned long len,
1899 unsigned long flags, struct page **pages);
1901 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1903 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1904 unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
1905 extern unsigned long do_mmap(struct file *file, unsigned long addr,
1906 unsigned long len, unsigned long prot, unsigned long flags,
1907 vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate);
1908 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1910 static inline unsigned long
1911 do_mmap_pgoff(struct file *file, unsigned long addr,
1912 unsigned long len, unsigned long prot, unsigned long flags,
1913 unsigned long pgoff, unsigned long *populate)
1915 return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate);
1919 extern int __mm_populate(unsigned long addr, unsigned long len,
1921 static inline void mm_populate(unsigned long addr, unsigned long len)
1924 (void) __mm_populate(addr, len, 1);
1927 static inline void mm_populate(unsigned long addr, unsigned long len) {}
1930 /* These take the mm semaphore themselves */
1931 extern unsigned long vm_brk(unsigned long, unsigned long);
1932 extern int vm_munmap(unsigned long, size_t);
1933 extern unsigned long vm_mmap(struct file *, unsigned long,
1934 unsigned long, unsigned long,
1935 unsigned long, unsigned long);
1937 struct vm_unmapped_area_info {
1938 #define VM_UNMAPPED_AREA_TOPDOWN 1
1939 unsigned long flags;
1940 unsigned long length;
1941 unsigned long low_limit;
1942 unsigned long high_limit;
1943 unsigned long align_mask;
1944 unsigned long align_offset;
1947 extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
1948 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
1951 * Search for an unmapped address range.
1953 * We are looking for a range that:
1954 * - does not intersect with any VMA;
1955 * - is contained within the [low_limit, high_limit) interval;
1956 * - is at least the desired size.
1957 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1959 static inline unsigned long
1960 vm_unmapped_area(struct vm_unmapped_area_info *info)
1962 if (info->flags & VM_UNMAPPED_AREA_TOPDOWN)
1963 return unmapped_area_topdown(info);
1965 return unmapped_area(info);
1969 extern void truncate_inode_pages(struct address_space *, loff_t);
1970 extern void truncate_inode_pages_range(struct address_space *,
1971 loff_t lstart, loff_t lend);
1972 extern void truncate_inode_pages_final(struct address_space *);
1974 /* generic vm_area_ops exported for stackable file systems */
1975 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1976 extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
1977 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1979 /* mm/page-writeback.c */
1980 int write_one_page(struct page *page, int wait);
1981 void task_dirty_inc(struct task_struct *tsk);
1984 #define VM_MAX_READAHEAD 128 /* kbytes */
1985 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1987 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1988 pgoff_t offset, unsigned long nr_to_read);
1990 void page_cache_sync_readahead(struct address_space *mapping,
1991 struct file_ra_state *ra,
1994 unsigned long size);
1996 void page_cache_async_readahead(struct address_space *mapping,
1997 struct file_ra_state *ra,
2001 unsigned long size);
2003 extern unsigned long stack_guard_gap;
2004 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
2005 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
2007 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
2008 extern int expand_downwards(struct vm_area_struct *vma,
2009 unsigned long address);
2011 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
2013 #define expand_upwards(vma, address) (0)
2016 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
2017 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
2018 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
2019 struct vm_area_struct **pprev);
2021 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
2022 NULL if none. Assume start_addr < end_addr. */
2023 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
2025 struct vm_area_struct * vma = find_vma(mm,start_addr);
2027 if (vma && end_addr <= vma->vm_start)
2032 static inline unsigned long vm_start_gap(struct vm_area_struct *vma)
2034 unsigned long vm_start = vma->vm_start;
2036 if (vma->vm_flags & VM_GROWSDOWN) {
2037 vm_start -= stack_guard_gap;
2038 if (vm_start > vma->vm_start)
2044 static inline unsigned long vm_end_gap(struct vm_area_struct *vma)
2046 unsigned long vm_end = vma->vm_end;
2048 if (vma->vm_flags & VM_GROWSUP) {
2049 vm_end += stack_guard_gap;
2050 if (vm_end < vma->vm_end)
2051 vm_end = -PAGE_SIZE;
2056 static inline unsigned long vma_pages(struct vm_area_struct *vma)
2058 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
2061 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2062 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
2063 unsigned long vm_start, unsigned long vm_end)
2065 struct vm_area_struct *vma = find_vma(mm, vm_start);
2067 if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
2074 pgprot_t vm_get_page_prot(unsigned long vm_flags);
2075 void vma_set_page_prot(struct vm_area_struct *vma);
2077 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
2081 static inline void vma_set_page_prot(struct vm_area_struct *vma)
2083 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
2087 #ifdef CONFIG_NUMA_BALANCING
2088 unsigned long change_prot_numa(struct vm_area_struct *vma,
2089 unsigned long start, unsigned long end);
2092 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
2093 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
2094 unsigned long pfn, unsigned long size, pgprot_t);
2095 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
2096 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
2098 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
2100 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
2103 struct page *follow_page_mask(struct vm_area_struct *vma,
2104 unsigned long address, unsigned int foll_flags,
2105 unsigned int *page_mask);
2107 static inline struct page *follow_page(struct vm_area_struct *vma,
2108 unsigned long address, unsigned int foll_flags)
2110 unsigned int unused_page_mask;
2111 return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
2114 #define FOLL_WRITE 0x01 /* check pte is writable */
2115 #define FOLL_TOUCH 0x02 /* mark page accessed */
2116 #define FOLL_GET 0x04 /* do get_page on page */
2117 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2118 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2119 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2120 * and return without waiting upon it */
2121 #define FOLL_POPULATE 0x40 /* fault in page */
2122 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2123 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2124 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2125 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2126 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2127 #define FOLL_MLOCK 0x1000 /* lock present pages */
2128 #define FOLL_COW 0x4000 /* internal GUP flag */
2130 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
2132 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
2133 unsigned long size, pte_fn_t fn, void *data);
2135 #ifdef CONFIG_PROC_FS
2136 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
2138 static inline void vm_stat_account(struct mm_struct *mm,
2139 unsigned long flags, struct file *file, long pages)
2141 mm->total_vm += pages;
2143 #endif /* CONFIG_PROC_FS */
2145 #ifdef CONFIG_DEBUG_PAGEALLOC
2146 extern bool _debug_pagealloc_enabled;
2147 extern void __kernel_map_pages(struct page *page, int numpages, int enable);
2149 static inline bool debug_pagealloc_enabled(void)
2151 return _debug_pagealloc_enabled;
2155 kernel_map_pages(struct page *page, int numpages, int enable)
2157 if (!debug_pagealloc_enabled())
2160 __kernel_map_pages(page, numpages, enable);
2162 #ifdef CONFIG_HIBERNATION
2163 extern bool kernel_page_present(struct page *page);
2164 #endif /* CONFIG_HIBERNATION */
2167 kernel_map_pages(struct page *page, int numpages, int enable) {}
2168 #ifdef CONFIG_HIBERNATION
2169 static inline bool kernel_page_present(struct page *page) { return true; }
2170 #endif /* CONFIG_HIBERNATION */
2173 #ifdef __HAVE_ARCH_GATE_AREA
2174 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
2175 extern int in_gate_area_no_mm(unsigned long addr);
2176 extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
2178 static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
2182 static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
2183 static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
2187 #endif /* __HAVE_ARCH_GATE_AREA */
2189 #ifdef CONFIG_SYSCTL
2190 extern int sysctl_drop_caches;
2191 int drop_caches_sysctl_handler(struct ctl_table *, int,
2192 void __user *, size_t *, loff_t *);
2195 void drop_slab(void);
2196 void drop_slab_node(int nid);
2199 #define randomize_va_space 0
2201 extern int randomize_va_space;
2204 const char * arch_vma_name(struct vm_area_struct *vma);
2205 void print_vma_addr(char *prefix, unsigned long rip);
2207 void sparse_mem_maps_populate_node(struct page **map_map,
2208 unsigned long pnum_begin,
2209 unsigned long pnum_end,
2210 unsigned long map_count,
2213 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
2214 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
2215 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
2216 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
2217 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
2218 void *vmemmap_alloc_block(unsigned long size, int node);
2219 void *vmemmap_alloc_block_buf(unsigned long size, int node);
2220 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
2221 int vmemmap_populate_basepages(unsigned long start, unsigned long end,
2223 int vmemmap_populate(unsigned long start, unsigned long end, int node);
2224 void vmemmap_populate_print_last(void);
2225 #ifdef CONFIG_MEMORY_HOTPLUG
2226 void vmemmap_free(unsigned long start, unsigned long end);
2228 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
2229 unsigned long size);
2232 MF_COUNT_INCREASED = 1 << 0,
2233 MF_ACTION_REQUIRED = 1 << 1,
2234 MF_MUST_KILL = 1 << 2,
2235 MF_SOFT_OFFLINE = 1 << 3,
2237 extern int memory_failure(unsigned long pfn, int trapno, int flags);
2238 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
2239 extern int unpoison_memory(unsigned long pfn);
2240 extern int get_hwpoison_page(struct page *page);
2241 extern void put_hwpoison_page(struct page *page);
2242 extern int sysctl_memory_failure_early_kill;
2243 extern int sysctl_memory_failure_recovery;
2244 extern void shake_page(struct page *p, int access);
2245 extern atomic_long_t num_poisoned_pages;
2246 extern int soft_offline_page(struct page *page, int flags);
2250 * Error handlers for various types of pages.
2253 MF_IGNORED, /* Error: cannot be handled */
2254 MF_FAILED, /* Error: handling failed */
2255 MF_DELAYED, /* Will be handled later */
2256 MF_RECOVERED, /* Successfully recovered */
2259 enum mf_action_page_type {
2261 MF_MSG_KERNEL_HIGH_ORDER,
2263 MF_MSG_DIFFERENT_COMPOUND,
2264 MF_MSG_POISONED_HUGE,
2267 MF_MSG_UNMAP_FAILED,
2268 MF_MSG_DIRTY_SWAPCACHE,
2269 MF_MSG_CLEAN_SWAPCACHE,
2270 MF_MSG_DIRTY_MLOCKED_LRU,
2271 MF_MSG_CLEAN_MLOCKED_LRU,
2272 MF_MSG_DIRTY_UNEVICTABLE_LRU,
2273 MF_MSG_CLEAN_UNEVICTABLE_LRU,
2276 MF_MSG_TRUNCATED_LRU,
2282 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2283 extern void clear_huge_page(struct page *page,
2285 unsigned int pages_per_huge_page);
2286 extern void copy_user_huge_page(struct page *dst, struct page *src,
2287 unsigned long addr, struct vm_area_struct *vma,
2288 unsigned int pages_per_huge_page);
2289 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2291 extern struct page_ext_operations debug_guardpage_ops;
2292 extern struct page_ext_operations page_poisoning_ops;
2294 #ifdef CONFIG_DEBUG_PAGEALLOC
2295 extern unsigned int _debug_guardpage_minorder;
2296 extern bool _debug_guardpage_enabled;
2298 static inline unsigned int debug_guardpage_minorder(void)
2300 return _debug_guardpage_minorder;
2303 static inline bool debug_guardpage_enabled(void)
2305 return _debug_guardpage_enabled;
2308 static inline bool page_is_guard(struct page *page)
2310 struct page_ext *page_ext;
2312 if (!debug_guardpage_enabled())
2315 page_ext = lookup_page_ext(page);
2316 return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
2319 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2320 static inline bool debug_guardpage_enabled(void) { return false; }
2321 static inline bool page_is_guard(struct page *page) { return false; }
2322 #endif /* CONFIG_DEBUG_PAGEALLOC */
2324 #if MAX_NUMNODES > 1
2325 void __init setup_nr_node_ids(void);
2327 static inline void setup_nr_node_ids(void) {}
2330 #endif /* __KERNEL__ */
2331 #endif /* _LINUX_MM_H */