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/percpu-refcount.h>
20 #include <linux/bit_spinlock.h>
21 #include <linux/shrinker.h>
22 #include <linux/resource.h>
23 #include <linux/page_ext.h>
24 #include <linux/err.h>
28 struct anon_vma_chain;
31 struct writeback_control;
34 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
35 extern unsigned long max_mapnr;
37 static inline void set_max_mapnr(unsigned long limit)
42 static inline void set_max_mapnr(unsigned long limit) { }
45 extern unsigned long totalram_pages;
46 extern void * high_memory;
47 extern int page_cluster;
50 extern int sysctl_legacy_va_layout;
52 #define sysctl_legacy_va_layout 0
55 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
56 extern const int mmap_rnd_bits_min;
57 extern const int mmap_rnd_bits_max;
58 extern int mmap_rnd_bits __read_mostly;
60 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
61 extern const int mmap_rnd_compat_bits_min;
62 extern const int mmap_rnd_compat_bits_max;
63 extern int mmap_rnd_compat_bits __read_mostly;
67 #include <asm/pgtable.h>
68 #include <asm/processor.h>
71 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
75 * To prevent common memory management code establishing
76 * a zero page mapping on a read fault.
77 * This macro should be defined within <asm/pgtable.h>.
78 * s390 does this to prevent multiplexing of hardware bits
79 * related to the physical page in case of virtualization.
81 #ifndef mm_forbids_zeropage
82 #define mm_forbids_zeropage(X) (0)
85 extern unsigned long sysctl_user_reserve_kbytes;
86 extern unsigned long sysctl_admin_reserve_kbytes;
88 extern int sysctl_overcommit_memory;
89 extern int sysctl_overcommit_ratio;
90 extern unsigned long sysctl_overcommit_kbytes;
92 extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *,
94 extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
97 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
99 /* to align the pointer to the (next) page boundary */
100 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
102 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
103 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
106 * Linux kernel virtual memory manager primitives.
107 * The idea being to have a "virtual" mm in the same way
108 * we have a virtual fs - giving a cleaner interface to the
109 * mm details, and allowing different kinds of memory mappings
110 * (from shared memory to executable loading to arbitrary
114 extern struct kmem_cache *vm_area_cachep;
117 extern struct rb_root nommu_region_tree;
118 extern struct rw_semaphore nommu_region_sem;
120 extern unsigned int kobjsize(const void *objp);
124 * vm_flags in vm_area_struct, see mm_types.h.
126 #define VM_NONE 0x00000000
128 #define VM_READ 0x00000001 /* currently active flags */
129 #define VM_WRITE 0x00000002
130 #define VM_EXEC 0x00000004
131 #define VM_SHARED 0x00000008
133 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
134 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
135 #define VM_MAYWRITE 0x00000020
136 #define VM_MAYEXEC 0x00000040
137 #define VM_MAYSHARE 0x00000080
139 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
140 #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
141 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
142 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
143 #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
145 #define VM_LOCKED 0x00002000
146 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
148 /* Used by sys_madvise() */
149 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
150 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
152 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
153 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
154 #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
155 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
156 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
157 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
158 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
159 #define VM_ARCH_2 0x02000000
160 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
162 #ifdef CONFIG_MEM_SOFT_DIRTY
163 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
165 # define VM_SOFTDIRTY 0
168 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
169 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
170 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
171 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
173 #if defined(CONFIG_X86)
174 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
175 #elif defined(CONFIG_PPC)
176 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
177 #elif defined(CONFIG_PARISC)
178 # define VM_GROWSUP VM_ARCH_1
179 #elif defined(CONFIG_METAG)
180 # define VM_GROWSUP VM_ARCH_1
181 #elif defined(CONFIG_IA64)
182 # define VM_GROWSUP VM_ARCH_1
183 #elif !defined(CONFIG_MMU)
184 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
187 #if defined(CONFIG_X86)
188 /* MPX specific bounds table or bounds directory */
189 # define VM_MPX VM_ARCH_2
193 # define VM_GROWSUP VM_NONE
196 /* Bits set in the VMA until the stack is in its final location */
197 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
199 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
200 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
203 #ifdef CONFIG_STACK_GROWSUP
204 #define VM_STACK VM_GROWSUP
206 #define VM_STACK VM_GROWSDOWN
209 #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
212 * Special vmas that are non-mergable, non-mlock()able.
213 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
215 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
217 /* This mask defines which mm->def_flags a process can inherit its parent */
218 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
220 /* This mask is used to clear all the VMA flags used by mlock */
221 #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
224 * mapping from the currently active vm_flags protection bits (the
225 * low four bits) to a page protection mask..
227 extern pgprot_t protection_map[16];
229 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
230 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
231 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
232 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
233 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
234 #define FAULT_FLAG_TRIED 0x20 /* Second try */
235 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
238 * vm_fault is filled by the the pagefault handler and passed to the vma's
239 * ->fault function. The vma's ->fault is responsible for returning a bitmask
240 * of VM_FAULT_xxx flags that give details about how the fault was handled.
242 * MM layer fills up gfp_mask for page allocations but fault handler might
243 * alter it if its implementation requires a different allocation context.
245 * pgoff should be used in favour of virtual_address, if possible.
248 unsigned int flags; /* FAULT_FLAG_xxx flags */
249 gfp_t gfp_mask; /* gfp mask to be used for allocations */
250 pgoff_t pgoff; /* Logical page offset based on vma */
251 void __user *virtual_address; /* Faulting virtual address */
253 struct page *cow_page; /* Handler may choose to COW */
254 struct page *page; /* ->fault handlers should return a
255 * page here, unless VM_FAULT_NOPAGE
256 * is set (which is also implied by
259 /* for ->map_pages() only */
260 pgoff_t max_pgoff; /* map pages for offset from pgoff till
261 * max_pgoff inclusive */
262 pte_t *pte; /* pte entry associated with ->pgoff */
266 * These are the virtual MM functions - opening of an area, closing and
267 * unmapping it (needed to keep files on disk up-to-date etc), pointer
268 * to the functions called when a no-page or a wp-page exception occurs.
270 struct vm_operations_struct {
271 void (*open)(struct vm_area_struct * area);
272 void (*close)(struct vm_area_struct * area);
273 int (*mremap)(struct vm_area_struct * area);
274 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
275 int (*pmd_fault)(struct vm_area_struct *, unsigned long address,
276 pmd_t *, unsigned int flags);
277 void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
279 /* notification that a previously read-only page is about to become
280 * writable, if an error is returned it will cause a SIGBUS */
281 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
283 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
284 int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
286 /* called by access_process_vm when get_user_pages() fails, typically
287 * for use by special VMAs that can switch between memory and hardware
289 int (*access)(struct vm_area_struct *vma, unsigned long addr,
290 void *buf, int len, int write);
292 /* Called by the /proc/PID/maps code to ask the vma whether it
293 * has a special name. Returning non-NULL will also cause this
294 * vma to be dumped unconditionally. */
295 const char *(*name)(struct vm_area_struct *vma);
299 * set_policy() op must add a reference to any non-NULL @new mempolicy
300 * to hold the policy upon return. Caller should pass NULL @new to
301 * remove a policy and fall back to surrounding context--i.e. do not
302 * install a MPOL_DEFAULT policy, nor the task or system default
305 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
308 * get_policy() op must add reference [mpol_get()] to any policy at
309 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
310 * in mm/mempolicy.c will do this automatically.
311 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
312 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
313 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
314 * must return NULL--i.e., do not "fallback" to task or system default
317 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
321 * Called by vm_normal_page() for special PTEs to find the
322 * page for @addr. This is useful if the default behavior
323 * (using pte_page()) would not find the correct page.
325 struct page *(*find_special_page)(struct vm_area_struct *vma,
332 #define page_private(page) ((page)->private)
333 #define set_page_private(page, v) ((page)->private = (v))
335 #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
336 static inline int pmd_devmap(pmd_t pmd)
343 * FIXME: take this include out, include page-flags.h in
344 * files which need it (119 of them)
346 #include <linux/page-flags.h>
347 #include <linux/huge_mm.h>
350 * Methods to modify the page usage count.
352 * What counts for a page usage:
353 * - cache mapping (page->mapping)
354 * - private data (page->private)
355 * - page mapped in a task's page tables, each mapping
356 * is counted separately
358 * Also, many kernel routines increase the page count before a critical
359 * routine so they can be sure the page doesn't go away from under them.
363 * Drop a ref, return true if the refcount fell to zero (the page has no users)
365 static inline int put_page_testzero(struct page *page)
367 VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page);
368 return atomic_dec_and_test(&page->_count);
372 * Try to grab a ref unless the page has a refcount of zero, return false if
374 * This can be called when MMU is off so it must not access
375 * any of the virtual mappings.
377 static inline int get_page_unless_zero(struct page *page)
379 return atomic_inc_not_zero(&page->_count);
382 extern int page_is_ram(unsigned long pfn);
390 int region_intersects(resource_size_t offset, size_t size, unsigned long flags,
393 /* Support for virtually mapped pages */
394 struct page *vmalloc_to_page(const void *addr);
395 unsigned long vmalloc_to_pfn(const void *addr);
398 * Determine if an address is within the vmalloc range
400 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
401 * is no special casing required.
403 static inline int is_vmalloc_addr(const void *x)
406 unsigned long addr = (unsigned long)x;
408 return addr >= VMALLOC_START && addr < VMALLOC_END;
414 extern int is_vmalloc_or_module_addr(const void *x);
416 static inline int is_vmalloc_or_module_addr(const void *x)
422 extern void kvfree(const void *addr);
424 static inline atomic_t *compound_mapcount_ptr(struct page *page)
426 return &page[1].compound_mapcount;
429 static inline int compound_mapcount(struct page *page)
431 if (!PageCompound(page))
433 page = compound_head(page);
434 return atomic_read(compound_mapcount_ptr(page)) + 1;
438 * The atomic page->_mapcount, starts from -1: so that transitions
439 * both from it and to it can be tracked, using atomic_inc_and_test
440 * and atomic_add_negative(-1).
442 static inline void page_mapcount_reset(struct page *page)
444 atomic_set(&(page)->_mapcount, -1);
447 int __page_mapcount(struct page *page);
449 static inline int page_mapcount(struct page *page)
451 VM_BUG_ON_PAGE(PageSlab(page), page);
453 if (unlikely(PageCompound(page)))
454 return __page_mapcount(page);
455 return atomic_read(&page->_mapcount) + 1;
458 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
459 int total_mapcount(struct page *page);
461 static inline int total_mapcount(struct page *page)
463 return page_mapcount(page);
467 static inline int page_count(struct page *page)
469 return atomic_read(&compound_head(page)->_count);
472 static inline struct page *virt_to_head_page(const void *x)
474 struct page *page = virt_to_page(x);
476 return compound_head(page);
480 * Setup the page count before being freed into the page allocator for
481 * the first time (boot or memory hotplug)
483 static inline void init_page_count(struct page *page)
485 atomic_set(&page->_count, 1);
488 void __put_page(struct page *page);
490 void put_pages_list(struct list_head *pages);
492 void split_page(struct page *page, unsigned int order);
493 int split_free_page(struct page *page);
496 * Compound pages have a destructor function. Provide a
497 * prototype for that function and accessor functions.
498 * These are _only_ valid on the head of a compound page.
500 typedef void compound_page_dtor(struct page *);
502 /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
503 enum compound_dtor_id {
506 #ifdef CONFIG_HUGETLB_PAGE
509 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
514 extern compound_page_dtor * const compound_page_dtors[];
516 static inline void set_compound_page_dtor(struct page *page,
517 enum compound_dtor_id compound_dtor)
519 VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page);
520 page[1].compound_dtor = compound_dtor;
523 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
525 VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page);
526 return compound_page_dtors[page[1].compound_dtor];
529 static inline unsigned int compound_order(struct page *page)
533 return page[1].compound_order;
536 static inline void set_compound_order(struct page *page, unsigned int order)
538 page[1].compound_order = order;
541 void free_compound_page(struct page *page);
545 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
546 * servicing faults for write access. In the normal case, do always want
547 * pte_mkwrite. But get_user_pages can cause write faults for mappings
548 * that do not have writing enabled, when used by access_process_vm.
550 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
552 if (likely(vma->vm_flags & VM_WRITE))
553 pte = pte_mkwrite(pte);
557 void do_set_pte(struct vm_area_struct *vma, unsigned long address,
558 struct page *page, pte_t *pte, bool write, bool anon);
562 * Multiple processes may "see" the same page. E.g. for untouched
563 * mappings of /dev/null, all processes see the same page full of
564 * zeroes, and text pages of executables and shared libraries have
565 * only one copy in memory, at most, normally.
567 * For the non-reserved pages, page_count(page) denotes a reference count.
568 * page_count() == 0 means the page is free. page->lru is then used for
569 * freelist management in the buddy allocator.
570 * page_count() > 0 means the page has been allocated.
572 * Pages are allocated by the slab allocator in order to provide memory
573 * to kmalloc and kmem_cache_alloc. In this case, the management of the
574 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
575 * unless a particular usage is carefully commented. (the responsibility of
576 * freeing the kmalloc memory is the caller's, of course).
578 * A page may be used by anyone else who does a __get_free_page().
579 * In this case, page_count still tracks the references, and should only
580 * be used through the normal accessor functions. The top bits of page->flags
581 * and page->virtual store page management information, but all other fields
582 * are unused and could be used privately, carefully. The management of this
583 * page is the responsibility of the one who allocated it, and those who have
584 * subsequently been given references to it.
586 * The other pages (we may call them "pagecache pages") are completely
587 * managed by the Linux memory manager: I/O, buffers, swapping etc.
588 * The following discussion applies only to them.
590 * A pagecache page contains an opaque `private' member, which belongs to the
591 * page's address_space. Usually, this is the address of a circular list of
592 * the page's disk buffers. PG_private must be set to tell the VM to call
593 * into the filesystem to release these pages.
595 * A page may belong to an inode's memory mapping. In this case, page->mapping
596 * is the pointer to the inode, and page->index is the file offset of the page,
597 * in units of PAGE_CACHE_SIZE.
599 * If pagecache pages are not associated with an inode, they are said to be
600 * anonymous pages. These may become associated with the swapcache, and in that
601 * case PG_swapcache is set, and page->private is an offset into the swapcache.
603 * In either case (swapcache or inode backed), the pagecache itself holds one
604 * reference to the page. Setting PG_private should also increment the
605 * refcount. The each user mapping also has a reference to the page.
607 * The pagecache pages are stored in a per-mapping radix tree, which is
608 * rooted at mapping->page_tree, and indexed by offset.
609 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
610 * lists, we instead now tag pages as dirty/writeback in the radix tree.
612 * All pagecache pages may be subject to I/O:
613 * - inode pages may need to be read from disk,
614 * - inode pages which have been modified and are MAP_SHARED may need
615 * to be written back to the inode on disk,
616 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
617 * modified may need to be swapped out to swap space and (later) to be read
622 * The zone field is never updated after free_area_init_core()
623 * sets it, so none of the operations on it need to be atomic.
626 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
627 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
628 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
629 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
630 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
633 * Define the bit shifts to access each section. For non-existent
634 * sections we define the shift as 0; that plus a 0 mask ensures
635 * the compiler will optimise away reference to them.
637 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
638 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
639 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
640 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
642 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
643 #ifdef NODE_NOT_IN_PAGE_FLAGS
644 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
645 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
646 SECTIONS_PGOFF : ZONES_PGOFF)
648 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
649 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
650 NODES_PGOFF : ZONES_PGOFF)
653 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
655 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
656 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
659 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
660 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
661 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
662 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
663 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
665 static inline enum zone_type page_zonenum(const struct page *page)
667 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
670 #ifdef CONFIG_ZONE_DEVICE
671 void get_zone_device_page(struct page *page);
672 void put_zone_device_page(struct page *page);
673 static inline bool is_zone_device_page(const struct page *page)
675 return page_zonenum(page) == ZONE_DEVICE;
678 static inline void get_zone_device_page(struct page *page)
681 static inline void put_zone_device_page(struct page *page)
684 static inline bool is_zone_device_page(const struct page *page)
690 static inline void get_page(struct page *page)
692 page = compound_head(page);
694 * Getting a normal page or the head of a compound page
695 * requires to already have an elevated page->_count.
697 VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
698 atomic_inc(&page->_count);
700 if (unlikely(is_zone_device_page(page)))
701 get_zone_device_page(page);
704 static inline void put_page(struct page *page)
706 page = compound_head(page);
708 if (put_page_testzero(page))
711 if (unlikely(is_zone_device_page(page)))
712 put_zone_device_page(page);
715 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
716 #define SECTION_IN_PAGE_FLAGS
720 * The identification function is mainly used by the buddy allocator for
721 * determining if two pages could be buddies. We are not really identifying
722 * the zone since we could be using the section number id if we do not have
723 * node id available in page flags.
724 * We only guarantee that it will return the same value for two combinable
727 static inline int page_zone_id(struct page *page)
729 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
732 static inline int zone_to_nid(struct zone *zone)
741 #ifdef NODE_NOT_IN_PAGE_FLAGS
742 extern int page_to_nid(const struct page *page);
744 static inline int page_to_nid(const struct page *page)
746 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
750 #ifdef CONFIG_NUMA_BALANCING
751 static inline int cpu_pid_to_cpupid(int cpu, int pid)
753 return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
756 static inline int cpupid_to_pid(int cpupid)
758 return cpupid & LAST__PID_MASK;
761 static inline int cpupid_to_cpu(int cpupid)
763 return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
766 static inline int cpupid_to_nid(int cpupid)
768 return cpu_to_node(cpupid_to_cpu(cpupid));
771 static inline bool cpupid_pid_unset(int cpupid)
773 return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
776 static inline bool cpupid_cpu_unset(int cpupid)
778 return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
781 static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
783 return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
786 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
787 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
788 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
790 return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
793 static inline int page_cpupid_last(struct page *page)
795 return page->_last_cpupid;
797 static inline void page_cpupid_reset_last(struct page *page)
799 page->_last_cpupid = -1 & LAST_CPUPID_MASK;
802 static inline int page_cpupid_last(struct page *page)
804 return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
807 extern int page_cpupid_xchg_last(struct page *page, int cpupid);
809 static inline void page_cpupid_reset_last(struct page *page)
811 int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
813 page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
814 page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
816 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
817 #else /* !CONFIG_NUMA_BALANCING */
818 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
820 return page_to_nid(page); /* XXX */
823 static inline int page_cpupid_last(struct page *page)
825 return page_to_nid(page); /* XXX */
828 static inline int cpupid_to_nid(int cpupid)
833 static inline int cpupid_to_pid(int cpupid)
838 static inline int cpupid_to_cpu(int cpupid)
843 static inline int cpu_pid_to_cpupid(int nid, int pid)
848 static inline bool cpupid_pid_unset(int cpupid)
853 static inline void page_cpupid_reset_last(struct page *page)
857 static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
861 #endif /* CONFIG_NUMA_BALANCING */
863 static inline struct zone *page_zone(const struct page *page)
865 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
868 #ifdef SECTION_IN_PAGE_FLAGS
869 static inline void set_page_section(struct page *page, unsigned long section)
871 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
872 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
875 static inline unsigned long page_to_section(const struct page *page)
877 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
881 static inline void set_page_zone(struct page *page, enum zone_type zone)
883 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
884 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
887 static inline void set_page_node(struct page *page, unsigned long node)
889 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
890 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
893 static inline void set_page_links(struct page *page, enum zone_type zone,
894 unsigned long node, unsigned long pfn)
896 set_page_zone(page, zone);
897 set_page_node(page, node);
898 #ifdef SECTION_IN_PAGE_FLAGS
899 set_page_section(page, pfn_to_section_nr(pfn));
904 static inline struct mem_cgroup *page_memcg(struct page *page)
906 return page->mem_cgroup;
909 static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg)
911 page->mem_cgroup = memcg;
914 static inline struct mem_cgroup *page_memcg(struct page *page)
919 static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg)
925 * Some inline functions in vmstat.h depend on page_zone()
927 #include <linux/vmstat.h>
929 static __always_inline void *lowmem_page_address(const struct page *page)
931 return __va(PFN_PHYS(page_to_pfn(page)));
934 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
935 #define HASHED_PAGE_VIRTUAL
938 #if defined(WANT_PAGE_VIRTUAL)
939 static inline void *page_address(const struct page *page)
941 return page->virtual;
943 static inline void set_page_address(struct page *page, void *address)
945 page->virtual = address;
947 #define page_address_init() do { } while(0)
950 #if defined(HASHED_PAGE_VIRTUAL)
951 void *page_address(const struct page *page);
952 void set_page_address(struct page *page, void *virtual);
953 void page_address_init(void);
956 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
957 #define page_address(page) lowmem_page_address(page)
958 #define set_page_address(page, address) do { } while(0)
959 #define page_address_init() do { } while(0)
962 extern void *page_rmapping(struct page *page);
963 extern struct anon_vma *page_anon_vma(struct page *page);
964 extern struct address_space *page_mapping(struct page *page);
966 extern struct address_space *__page_file_mapping(struct page *);
969 struct address_space *page_file_mapping(struct page *page)
971 if (unlikely(PageSwapCache(page)))
972 return __page_file_mapping(page);
974 return page->mapping;
978 * Return the pagecache index of the passed page. Regular pagecache pages
979 * use ->index whereas swapcache pages use ->private
981 static inline pgoff_t page_index(struct page *page)
983 if (unlikely(PageSwapCache(page)))
984 return page_private(page);
988 extern pgoff_t __page_file_index(struct page *page);
991 * Return the file index of the page. Regular pagecache pages use ->index
992 * whereas swapcache pages use swp_offset(->private)
994 static inline pgoff_t page_file_index(struct page *page)
996 if (unlikely(PageSwapCache(page)))
997 return __page_file_index(page);
1003 * Return true if this page is mapped into pagetables.
1004 * For compound page it returns true if any subpage of compound page is mapped.
1006 static inline bool page_mapped(struct page *page)
1009 if (likely(!PageCompound(page)))
1010 return atomic_read(&page->_mapcount) >= 0;
1011 page = compound_head(page);
1012 if (atomic_read(compound_mapcount_ptr(page)) >= 0)
1014 for (i = 0; i < hpage_nr_pages(page); i++) {
1015 if (atomic_read(&page[i]._mapcount) >= 0)
1022 * Return true only if the page has been allocated with
1023 * ALLOC_NO_WATERMARKS and the low watermark was not
1024 * met implying that the system is under some pressure.
1026 static inline bool page_is_pfmemalloc(struct page *page)
1029 * Page index cannot be this large so this must be
1030 * a pfmemalloc page.
1032 return page->index == -1UL;
1036 * Only to be called by the page allocator on a freshly allocated
1039 static inline void set_page_pfmemalloc(struct page *page)
1044 static inline void clear_page_pfmemalloc(struct page *page)
1050 * Different kinds of faults, as returned by handle_mm_fault().
1051 * Used to decide whether a process gets delivered SIGBUS or
1052 * just gets major/minor fault counters bumped up.
1055 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1057 #define VM_FAULT_OOM 0x0001
1058 #define VM_FAULT_SIGBUS 0x0002
1059 #define VM_FAULT_MAJOR 0x0004
1060 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1061 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1062 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1063 #define VM_FAULT_SIGSEGV 0x0040
1065 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1066 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1067 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1068 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1070 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1072 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1073 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1076 /* Encode hstate index for a hwpoisoned large page */
1077 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1078 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1081 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1083 extern void pagefault_out_of_memory(void);
1085 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1088 * Flags passed to show_mem() and show_free_areas() to suppress output in
1091 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1093 extern void show_free_areas(unsigned int flags);
1094 extern bool skip_free_areas_node(unsigned int flags, int nid);
1096 int shmem_zero_setup(struct vm_area_struct *);
1098 bool shmem_mapping(struct address_space *mapping);
1100 static inline bool shmem_mapping(struct address_space *mapping)
1106 extern bool can_do_mlock(void);
1107 extern int user_shm_lock(size_t, struct user_struct *);
1108 extern void user_shm_unlock(size_t, struct user_struct *);
1111 * Parameter block passed down to zap_pte_range in exceptional cases.
1113 struct zap_details {
1114 struct address_space *check_mapping; /* Check page->mapping if set */
1115 pgoff_t first_index; /* Lowest page->index to unmap */
1116 pgoff_t last_index; /* Highest page->index to unmap */
1119 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
1122 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1123 unsigned long size);
1124 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
1125 unsigned long size, struct zap_details *);
1126 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
1127 unsigned long start, unsigned long end);
1130 * mm_walk - callbacks for walk_page_range
1131 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1132 * this handler is required to be able to handle
1133 * pmd_trans_huge() pmds. They may simply choose to
1134 * split_huge_page() instead of handling it explicitly.
1135 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1136 * @pte_hole: if set, called for each hole at all levels
1137 * @hugetlb_entry: if set, called for each hugetlb entry
1138 * @test_walk: caller specific callback function to determine whether
1139 * we walk over the current vma or not. A positive returned
1140 * value means "do page table walk over the current vma,"
1141 * and a negative one means "abort current page table walk
1142 * right now." 0 means "skip the current vma."
1143 * @mm: mm_struct representing the target process of page table walk
1144 * @vma: vma currently walked (NULL if walking outside vmas)
1145 * @private: private data for callbacks' usage
1147 * (see the comment on walk_page_range() for more details)
1150 int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1151 unsigned long next, struct mm_walk *walk);
1152 int (*pte_entry)(pte_t *pte, unsigned long addr,
1153 unsigned long next, struct mm_walk *walk);
1154 int (*pte_hole)(unsigned long addr, unsigned long next,
1155 struct mm_walk *walk);
1156 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1157 unsigned long addr, unsigned long next,
1158 struct mm_walk *walk);
1159 int (*test_walk)(unsigned long addr, unsigned long next,
1160 struct mm_walk *walk);
1161 struct mm_struct *mm;
1162 struct vm_area_struct *vma;
1166 int walk_page_range(unsigned long addr, unsigned long end,
1167 struct mm_walk *walk);
1168 int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
1169 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1170 unsigned long end, unsigned long floor, unsigned long ceiling);
1171 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1172 struct vm_area_struct *vma);
1173 void unmap_mapping_range(struct address_space *mapping,
1174 loff_t const holebegin, loff_t const holelen, int even_cows);
1175 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1176 unsigned long *pfn);
1177 int follow_phys(struct vm_area_struct *vma, unsigned long address,
1178 unsigned int flags, unsigned long *prot, resource_size_t *phys);
1179 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1180 void *buf, int len, int write);
1182 static inline void unmap_shared_mapping_range(struct address_space *mapping,
1183 loff_t const holebegin, loff_t const holelen)
1185 unmap_mapping_range(mapping, holebegin, holelen, 0);
1188 extern void truncate_pagecache(struct inode *inode, loff_t new);
1189 extern void truncate_setsize(struct inode *inode, loff_t newsize);
1190 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
1191 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1192 int truncate_inode_page(struct address_space *mapping, struct page *page);
1193 int generic_error_remove_page(struct address_space *mapping, struct page *page);
1194 int invalidate_inode_page(struct page *page);
1197 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
1198 unsigned long address, unsigned int flags);
1199 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1200 unsigned long address, unsigned int fault_flags,
1203 static inline int handle_mm_fault(struct mm_struct *mm,
1204 struct vm_area_struct *vma, unsigned long address,
1207 /* should never happen if there's no MMU */
1209 return VM_FAULT_SIGBUS;
1211 static inline int fixup_user_fault(struct task_struct *tsk,
1212 struct mm_struct *mm, unsigned long address,
1213 unsigned int fault_flags, bool *unlocked)
1215 /* should never happen if there's no MMU */
1221 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
1222 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1223 void *buf, int len, int write);
1225 long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1226 unsigned long start, unsigned long nr_pages,
1227 unsigned int foll_flags, struct page **pages,
1228 struct vm_area_struct **vmas, int *nonblocking);
1229 long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1230 unsigned long start, unsigned long nr_pages,
1231 int write, int force, struct page **pages,
1232 struct vm_area_struct **vmas);
1233 long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm,
1234 unsigned long start, unsigned long nr_pages,
1235 int write, int force, struct page **pages,
1237 long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
1238 unsigned long start, unsigned long nr_pages,
1239 int write, int force, struct page **pages,
1240 unsigned int gup_flags);
1241 long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
1242 unsigned long start, unsigned long nr_pages,
1243 int write, int force, struct page **pages);
1244 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1245 struct page **pages);
1247 /* Container for pinned pfns / pages */
1248 struct frame_vector {
1249 unsigned int nr_allocated; /* Number of frames we have space for */
1250 unsigned int nr_frames; /* Number of frames stored in ptrs array */
1251 bool got_ref; /* Did we pin pages by getting page ref? */
1252 bool is_pfns; /* Does array contain pages or pfns? */
1253 void *ptrs[0]; /* Array of pinned pfns / pages. Use
1254 * pfns_vector_pages() or pfns_vector_pfns()
1258 struct frame_vector *frame_vector_create(unsigned int nr_frames);
1259 void frame_vector_destroy(struct frame_vector *vec);
1260 int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
1261 bool write, bool force, struct frame_vector *vec);
1262 void put_vaddr_frames(struct frame_vector *vec);
1263 int frame_vector_to_pages(struct frame_vector *vec);
1264 void frame_vector_to_pfns(struct frame_vector *vec);
1266 static inline unsigned int frame_vector_count(struct frame_vector *vec)
1268 return vec->nr_frames;
1271 static inline struct page **frame_vector_pages(struct frame_vector *vec)
1274 int err = frame_vector_to_pages(vec);
1277 return ERR_PTR(err);
1279 return (struct page **)(vec->ptrs);
1282 static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
1285 frame_vector_to_pfns(vec);
1286 return (unsigned long *)(vec->ptrs);
1290 int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1291 struct page **pages);
1292 int get_kernel_page(unsigned long start, int write, struct page **pages);
1293 struct page *get_dump_page(unsigned long addr);
1295 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1296 extern void do_invalidatepage(struct page *page, unsigned int offset,
1297 unsigned int length);
1299 int __set_page_dirty_nobuffers(struct page *page);
1300 int __set_page_dirty_no_writeback(struct page *page);
1301 int redirty_page_for_writepage(struct writeback_control *wbc,
1303 void account_page_dirtied(struct page *page, struct address_space *mapping,
1304 struct mem_cgroup *memcg);
1305 void account_page_cleaned(struct page *page, struct address_space *mapping,
1306 struct mem_cgroup *memcg, struct bdi_writeback *wb);
1307 int set_page_dirty(struct page *page);
1308 int set_page_dirty_lock(struct page *page);
1309 void cancel_dirty_page(struct page *page);
1310 int clear_page_dirty_for_io(struct page *page);
1312 int get_cmdline(struct task_struct *task, char *buffer, int buflen);
1314 /* Is the vma a continuation of the stack vma above it? */
1315 static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1317 return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
1320 static inline bool vma_is_anonymous(struct vm_area_struct *vma)
1322 return !vma->vm_ops;
1325 static inline int stack_guard_page_start(struct vm_area_struct *vma,
1328 return (vma->vm_flags & VM_GROWSDOWN) &&
1329 (vma->vm_start == addr) &&
1330 !vma_growsdown(vma->vm_prev, addr);
1333 /* Is the vma a continuation of the stack vma below it? */
1334 static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
1336 return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
1339 static inline int stack_guard_page_end(struct vm_area_struct *vma,
1342 return (vma->vm_flags & VM_GROWSUP) &&
1343 (vma->vm_end == addr) &&
1344 !vma_growsup(vma->vm_next, addr);
1347 int vma_is_stack_for_task(struct vm_area_struct *vma, struct task_struct *t);
1349 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1350 unsigned long old_addr, struct vm_area_struct *new_vma,
1351 unsigned long new_addr, unsigned long len,
1352 bool need_rmap_locks);
1353 extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1354 unsigned long end, pgprot_t newprot,
1355 int dirty_accountable, int prot_numa);
1356 extern int mprotect_fixup(struct vm_area_struct *vma,
1357 struct vm_area_struct **pprev, unsigned long start,
1358 unsigned long end, unsigned long newflags);
1361 * doesn't attempt to fault and will return short.
1363 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1364 struct page **pages);
1366 * per-process(per-mm_struct) statistics.
1368 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1370 long val = atomic_long_read(&mm->rss_stat.count[member]);
1372 #ifdef SPLIT_RSS_COUNTING
1374 * counter is updated in asynchronous manner and may go to minus.
1375 * But it's never be expected number for users.
1380 return (unsigned long)val;
1383 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1385 atomic_long_add(value, &mm->rss_stat.count[member]);
1388 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1390 atomic_long_inc(&mm->rss_stat.count[member]);
1393 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1395 atomic_long_dec(&mm->rss_stat.count[member]);
1398 /* Optimized variant when page is already known not to be PageAnon */
1399 static inline int mm_counter_file(struct page *page)
1401 if (PageSwapBacked(page))
1402 return MM_SHMEMPAGES;
1403 return MM_FILEPAGES;
1406 static inline int mm_counter(struct page *page)
1409 return MM_ANONPAGES;
1410 return mm_counter_file(page);
1413 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1415 return get_mm_counter(mm, MM_FILEPAGES) +
1416 get_mm_counter(mm, MM_ANONPAGES) +
1417 get_mm_counter(mm, MM_SHMEMPAGES);
1420 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1422 return max(mm->hiwater_rss, get_mm_rss(mm));
1425 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1427 return max(mm->hiwater_vm, mm->total_vm);
1430 static inline void update_hiwater_rss(struct mm_struct *mm)
1432 unsigned long _rss = get_mm_rss(mm);
1434 if ((mm)->hiwater_rss < _rss)
1435 (mm)->hiwater_rss = _rss;
1438 static inline void update_hiwater_vm(struct mm_struct *mm)
1440 if (mm->hiwater_vm < mm->total_vm)
1441 mm->hiwater_vm = mm->total_vm;
1444 static inline void reset_mm_hiwater_rss(struct mm_struct *mm)
1446 mm->hiwater_rss = get_mm_rss(mm);
1449 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1450 struct mm_struct *mm)
1452 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1454 if (*maxrss < hiwater_rss)
1455 *maxrss = hiwater_rss;
1458 #if defined(SPLIT_RSS_COUNTING)
1459 void sync_mm_rss(struct mm_struct *mm);
1461 static inline void sync_mm_rss(struct mm_struct *mm)
1466 #ifndef __HAVE_ARCH_PTE_DEVMAP
1467 static inline int pte_devmap(pte_t pte)
1473 int vma_wants_writenotify(struct vm_area_struct *vma);
1475 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1477 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1481 __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1485 #ifdef __PAGETABLE_PUD_FOLDED
1486 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1487 unsigned long address)
1492 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1495 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1496 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1497 unsigned long address)
1502 static inline void mm_nr_pmds_init(struct mm_struct *mm) {}
1504 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1509 static inline void mm_inc_nr_pmds(struct mm_struct *mm) {}
1510 static inline void mm_dec_nr_pmds(struct mm_struct *mm) {}
1513 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1515 static inline void mm_nr_pmds_init(struct mm_struct *mm)
1517 atomic_long_set(&mm->nr_pmds, 0);
1520 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1522 return atomic_long_read(&mm->nr_pmds);
1525 static inline void mm_inc_nr_pmds(struct mm_struct *mm)
1527 atomic_long_inc(&mm->nr_pmds);
1530 static inline void mm_dec_nr_pmds(struct mm_struct *mm)
1532 atomic_long_dec(&mm->nr_pmds);
1536 int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1537 pmd_t *pmd, unsigned long address);
1538 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1541 * The following ifdef needed to get the 4level-fixup.h header to work.
1542 * Remove it when 4level-fixup.h has been removed.
1544 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1545 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1547 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1548 NULL: pud_offset(pgd, address);
1551 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1553 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1554 NULL: pmd_offset(pud, address);
1556 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1558 #if USE_SPLIT_PTE_PTLOCKS
1559 #if ALLOC_SPLIT_PTLOCKS
1560 void __init ptlock_cache_init(void);
1561 extern bool ptlock_alloc(struct page *page);
1562 extern void ptlock_free(struct page *page);
1564 static inline spinlock_t *ptlock_ptr(struct page *page)
1568 #else /* ALLOC_SPLIT_PTLOCKS */
1569 static inline void ptlock_cache_init(void)
1573 static inline bool ptlock_alloc(struct page *page)
1578 static inline void ptlock_free(struct page *page)
1582 static inline spinlock_t *ptlock_ptr(struct page *page)
1586 #endif /* ALLOC_SPLIT_PTLOCKS */
1588 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1590 return ptlock_ptr(pmd_page(*pmd));
1593 static inline bool ptlock_init(struct page *page)
1596 * prep_new_page() initialize page->private (and therefore page->ptl)
1597 * with 0. Make sure nobody took it in use in between.
1599 * It can happen if arch try to use slab for page table allocation:
1600 * slab code uses page->slab_cache, which share storage with page->ptl.
1602 VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
1603 if (!ptlock_alloc(page))
1605 spin_lock_init(ptlock_ptr(page));
1609 /* Reset page->mapping so free_pages_check won't complain. */
1610 static inline void pte_lock_deinit(struct page *page)
1612 page->mapping = NULL;
1616 #else /* !USE_SPLIT_PTE_PTLOCKS */
1618 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1620 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1622 return &mm->page_table_lock;
1624 static inline void ptlock_cache_init(void) {}
1625 static inline bool ptlock_init(struct page *page) { return true; }
1626 static inline void pte_lock_deinit(struct page *page) {}
1627 #endif /* USE_SPLIT_PTE_PTLOCKS */
1629 static inline void pgtable_init(void)
1631 ptlock_cache_init();
1632 pgtable_cache_init();
1635 static inline bool pgtable_page_ctor(struct page *page)
1637 if (!ptlock_init(page))
1639 inc_zone_page_state(page, NR_PAGETABLE);
1643 static inline void pgtable_page_dtor(struct page *page)
1645 pte_lock_deinit(page);
1646 dec_zone_page_state(page, NR_PAGETABLE);
1649 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1651 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1652 pte_t *__pte = pte_offset_map(pmd, address); \
1658 #define pte_unmap_unlock(pte, ptl) do { \
1663 #define pte_alloc_map(mm, vma, pmd, address) \
1664 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1666 NULL: pte_offset_map(pmd, address))
1668 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1669 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1671 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1673 #define pte_alloc_kernel(pmd, address) \
1674 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1675 NULL: pte_offset_kernel(pmd, address))
1677 #if USE_SPLIT_PMD_PTLOCKS
1679 static struct page *pmd_to_page(pmd_t *pmd)
1681 unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
1682 return virt_to_page((void *)((unsigned long) pmd & mask));
1685 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1687 return ptlock_ptr(pmd_to_page(pmd));
1690 static inline bool pgtable_pmd_page_ctor(struct page *page)
1692 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1693 page->pmd_huge_pte = NULL;
1695 return ptlock_init(page);
1698 static inline void pgtable_pmd_page_dtor(struct page *page)
1700 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1701 VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
1706 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1710 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1712 return &mm->page_table_lock;
1715 static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
1716 static inline void pgtable_pmd_page_dtor(struct page *page) {}
1718 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1722 static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
1724 spinlock_t *ptl = pmd_lockptr(mm, pmd);
1729 extern void free_area_init(unsigned long * zones_size);
1730 extern void free_area_init_node(int nid, unsigned long * zones_size,
1731 unsigned long zone_start_pfn, unsigned long *zholes_size);
1732 extern void free_initmem(void);
1735 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1736 * into the buddy system. The freed pages will be poisoned with pattern
1737 * "poison" if it's within range [0, UCHAR_MAX].
1738 * Return pages freed into the buddy system.
1740 extern unsigned long free_reserved_area(void *start, void *end,
1741 int poison, char *s);
1743 #ifdef CONFIG_HIGHMEM
1745 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1746 * and totalram_pages.
1748 extern void free_highmem_page(struct page *page);
1751 extern void adjust_managed_page_count(struct page *page, long count);
1752 extern void mem_init_print_info(const char *str);
1754 extern void reserve_bootmem_region(unsigned long start, unsigned long end);
1756 /* Free the reserved page into the buddy system, so it gets managed. */
1757 static inline void __free_reserved_page(struct page *page)
1759 ClearPageReserved(page);
1760 init_page_count(page);
1764 static inline void free_reserved_page(struct page *page)
1766 __free_reserved_page(page);
1767 adjust_managed_page_count(page, 1);
1770 static inline void mark_page_reserved(struct page *page)
1772 SetPageReserved(page);
1773 adjust_managed_page_count(page, -1);
1777 * Default method to free all the __init memory into the buddy system.
1778 * The freed pages will be poisoned with pattern "poison" if it's within
1779 * range [0, UCHAR_MAX].
1780 * Return pages freed into the buddy system.
1782 static inline unsigned long free_initmem_default(int poison)
1784 extern char __init_begin[], __init_end[];
1786 return free_reserved_area(&__init_begin, &__init_end,
1787 poison, "unused kernel");
1790 static inline unsigned long get_num_physpages(void)
1793 unsigned long phys_pages = 0;
1795 for_each_online_node(nid)
1796 phys_pages += node_present_pages(nid);
1801 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1803 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1804 * zones, allocate the backing mem_map and account for memory holes in a more
1805 * architecture independent manner. This is a substitute for creating the
1806 * zone_sizes[] and zholes_size[] arrays and passing them to
1807 * free_area_init_node()
1809 * An architecture is expected to register range of page frames backed by
1810 * physical memory with memblock_add[_node]() before calling
1811 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1812 * usage, an architecture is expected to do something like
1814 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1816 * for_each_valid_physical_page_range()
1817 * memblock_add_node(base, size, nid)
1818 * free_area_init_nodes(max_zone_pfns);
1820 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1821 * registered physical page range. Similarly
1822 * sparse_memory_present_with_active_regions() calls memory_present() for
1823 * each range when SPARSEMEM is enabled.
1825 * See mm/page_alloc.c for more information on each function exposed by
1826 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1828 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1829 unsigned long node_map_pfn_alignment(void);
1830 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1831 unsigned long end_pfn);
1832 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1833 unsigned long end_pfn);
1834 extern void get_pfn_range_for_nid(unsigned int nid,
1835 unsigned long *start_pfn, unsigned long *end_pfn);
1836 extern unsigned long find_min_pfn_with_active_regions(void);
1837 extern void free_bootmem_with_active_regions(int nid,
1838 unsigned long max_low_pfn);
1839 extern void sparse_memory_present_with_active_regions(int nid);
1841 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1843 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1844 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1845 static inline int __early_pfn_to_nid(unsigned long pfn,
1846 struct mminit_pfnnid_cache *state)
1851 /* please see mm/page_alloc.c */
1852 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1853 /* there is a per-arch backend function. */
1854 extern int __meminit __early_pfn_to_nid(unsigned long pfn,
1855 struct mminit_pfnnid_cache *state);
1858 extern void set_dma_reserve(unsigned long new_dma_reserve);
1859 extern void memmap_init_zone(unsigned long, int, unsigned long,
1860 unsigned long, enum memmap_context);
1861 extern void setup_per_zone_wmarks(void);
1862 extern int __meminit init_per_zone_wmark_min(void);
1863 extern void mem_init(void);
1864 extern void __init mmap_init(void);
1865 extern void show_mem(unsigned int flags);
1866 extern void si_meminfo(struct sysinfo * val);
1867 extern void si_meminfo_node(struct sysinfo *val, int nid);
1869 extern __printf(3, 4)
1870 void warn_alloc_failed(gfp_t gfp_mask, unsigned int order,
1871 const char *fmt, ...);
1873 extern void setup_per_cpu_pageset(void);
1875 extern void zone_pcp_update(struct zone *zone);
1876 extern void zone_pcp_reset(struct zone *zone);
1879 extern int min_free_kbytes;
1882 extern atomic_long_t mmap_pages_allocated;
1883 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1885 /* interval_tree.c */
1886 void vma_interval_tree_insert(struct vm_area_struct *node,
1887 struct rb_root *root);
1888 void vma_interval_tree_insert_after(struct vm_area_struct *node,
1889 struct vm_area_struct *prev,
1890 struct rb_root *root);
1891 void vma_interval_tree_remove(struct vm_area_struct *node,
1892 struct rb_root *root);
1893 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1894 unsigned long start, unsigned long last);
1895 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1896 unsigned long start, unsigned long last);
1898 #define vma_interval_tree_foreach(vma, root, start, last) \
1899 for (vma = vma_interval_tree_iter_first(root, start, last); \
1900 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1902 void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1903 struct rb_root *root);
1904 void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1905 struct rb_root *root);
1906 struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1907 struct rb_root *root, unsigned long start, unsigned long last);
1908 struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1909 struct anon_vma_chain *node, unsigned long start, unsigned long last);
1910 #ifdef CONFIG_DEBUG_VM_RB
1911 void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1914 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1915 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1916 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1919 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1920 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1921 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1922 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1923 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1924 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1925 struct mempolicy *, struct vm_userfaultfd_ctx);
1926 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1927 extern int split_vma(struct mm_struct *,
1928 struct vm_area_struct *, unsigned long addr, int new_below);
1929 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1930 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1931 struct rb_node **, struct rb_node *);
1932 extern void unlink_file_vma(struct vm_area_struct *);
1933 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1934 unsigned long addr, unsigned long len, pgoff_t pgoff,
1935 bool *need_rmap_locks);
1936 extern void exit_mmap(struct mm_struct *);
1938 static inline int check_data_rlimit(unsigned long rlim,
1940 unsigned long start,
1941 unsigned long end_data,
1942 unsigned long start_data)
1944 if (rlim < RLIM_INFINITY) {
1945 if (((new - start) + (end_data - start_data)) > rlim)
1952 extern int mm_take_all_locks(struct mm_struct *mm);
1953 extern void mm_drop_all_locks(struct mm_struct *mm);
1955 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1956 extern struct file *get_mm_exe_file(struct mm_struct *mm);
1958 extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages);
1959 extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages);
1961 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
1962 unsigned long addr, unsigned long len,
1963 unsigned long flags,
1964 const struct vm_special_mapping *spec);
1965 /* This is an obsolete alternative to _install_special_mapping. */
1966 extern int install_special_mapping(struct mm_struct *mm,
1967 unsigned long addr, unsigned long len,
1968 unsigned long flags, struct page **pages);
1970 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1972 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1973 unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
1974 extern unsigned long do_mmap(struct file *file, unsigned long addr,
1975 unsigned long len, unsigned long prot, unsigned long flags,
1976 vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate);
1977 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1979 static inline unsigned long
1980 do_mmap_pgoff(struct file *file, unsigned long addr,
1981 unsigned long len, unsigned long prot, unsigned long flags,
1982 unsigned long pgoff, unsigned long *populate)
1984 return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate);
1988 extern int __mm_populate(unsigned long addr, unsigned long len,
1990 static inline void mm_populate(unsigned long addr, unsigned long len)
1993 (void) __mm_populate(addr, len, 1);
1996 static inline void mm_populate(unsigned long addr, unsigned long len) {}
1999 /* These take the mm semaphore themselves */
2000 extern unsigned long vm_brk(unsigned long, unsigned long);
2001 extern int vm_munmap(unsigned long, size_t);
2002 extern unsigned long vm_mmap(struct file *, unsigned long,
2003 unsigned long, unsigned long,
2004 unsigned long, unsigned long);
2006 struct vm_unmapped_area_info {
2007 #define VM_UNMAPPED_AREA_TOPDOWN 1
2008 unsigned long flags;
2009 unsigned long length;
2010 unsigned long low_limit;
2011 unsigned long high_limit;
2012 unsigned long align_mask;
2013 unsigned long align_offset;
2016 extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
2017 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
2020 * Search for an unmapped address range.
2022 * We are looking for a range that:
2023 * - does not intersect with any VMA;
2024 * - is contained within the [low_limit, high_limit) interval;
2025 * - is at least the desired size.
2026 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
2028 static inline unsigned long
2029 vm_unmapped_area(struct vm_unmapped_area_info *info)
2031 if (info->flags & VM_UNMAPPED_AREA_TOPDOWN)
2032 return unmapped_area_topdown(info);
2034 return unmapped_area(info);
2038 extern void truncate_inode_pages(struct address_space *, loff_t);
2039 extern void truncate_inode_pages_range(struct address_space *,
2040 loff_t lstart, loff_t lend);
2041 extern void truncate_inode_pages_final(struct address_space *);
2043 /* generic vm_area_ops exported for stackable file systems */
2044 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
2045 extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
2046 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2048 /* mm/page-writeback.c */
2049 int write_one_page(struct page *page, int wait);
2050 void task_dirty_inc(struct task_struct *tsk);
2053 #define VM_MAX_READAHEAD 128 /* kbytes */
2054 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
2056 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
2057 pgoff_t offset, unsigned long nr_to_read);
2059 void page_cache_sync_readahead(struct address_space *mapping,
2060 struct file_ra_state *ra,
2063 unsigned long size);
2065 void page_cache_async_readahead(struct address_space *mapping,
2066 struct file_ra_state *ra,
2070 unsigned long size);
2072 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
2073 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
2075 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
2076 extern int expand_downwards(struct vm_area_struct *vma,
2077 unsigned long address);
2079 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
2081 #define expand_upwards(vma, address) (0)
2084 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
2085 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
2086 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
2087 struct vm_area_struct **pprev);
2089 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
2090 NULL if none. Assume start_addr < end_addr. */
2091 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
2093 struct vm_area_struct * vma = find_vma(mm,start_addr);
2095 if (vma && end_addr <= vma->vm_start)
2100 static inline unsigned long vma_pages(struct vm_area_struct *vma)
2102 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
2105 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2106 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
2107 unsigned long vm_start, unsigned long vm_end)
2109 struct vm_area_struct *vma = find_vma(mm, vm_start);
2111 if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
2118 pgprot_t vm_get_page_prot(unsigned long vm_flags);
2119 void vma_set_page_prot(struct vm_area_struct *vma);
2121 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
2125 static inline void vma_set_page_prot(struct vm_area_struct *vma)
2127 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
2131 #ifdef CONFIG_NUMA_BALANCING
2132 unsigned long change_prot_numa(struct vm_area_struct *vma,
2133 unsigned long start, unsigned long end);
2136 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
2137 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
2138 unsigned long pfn, unsigned long size, pgprot_t);
2139 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
2140 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
2142 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
2144 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
2147 struct page *follow_page_mask(struct vm_area_struct *vma,
2148 unsigned long address, unsigned int foll_flags,
2149 unsigned int *page_mask);
2151 static inline struct page *follow_page(struct vm_area_struct *vma,
2152 unsigned long address, unsigned int foll_flags)
2154 unsigned int unused_page_mask;
2155 return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
2158 #define FOLL_WRITE 0x01 /* check pte is writable */
2159 #define FOLL_TOUCH 0x02 /* mark page accessed */
2160 #define FOLL_GET 0x04 /* do get_page on page */
2161 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2162 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2163 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2164 * and return without waiting upon it */
2165 #define FOLL_POPULATE 0x40 /* fault in page */
2166 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2167 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2168 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2169 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2170 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2171 #define FOLL_MLOCK 0x1000 /* lock present pages */
2173 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
2175 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
2176 unsigned long size, pte_fn_t fn, void *data);
2179 #ifdef CONFIG_DEBUG_PAGEALLOC
2180 extern bool _debug_pagealloc_enabled;
2181 extern void __kernel_map_pages(struct page *page, int numpages, int enable);
2183 static inline bool debug_pagealloc_enabled(void)
2185 return _debug_pagealloc_enabled;
2189 kernel_map_pages(struct page *page, int numpages, int enable)
2191 if (!debug_pagealloc_enabled())
2194 __kernel_map_pages(page, numpages, enable);
2196 #ifdef CONFIG_HIBERNATION
2197 extern bool kernel_page_present(struct page *page);
2198 #endif /* CONFIG_HIBERNATION */
2201 kernel_map_pages(struct page *page, int numpages, int enable) {}
2202 #ifdef CONFIG_HIBERNATION
2203 static inline bool kernel_page_present(struct page *page) { return true; }
2204 #endif /* CONFIG_HIBERNATION */
2207 #ifdef __HAVE_ARCH_GATE_AREA
2208 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
2209 extern int in_gate_area_no_mm(unsigned long addr);
2210 extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
2212 static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
2216 static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
2217 static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
2221 #endif /* __HAVE_ARCH_GATE_AREA */
2223 #ifdef CONFIG_SYSCTL
2224 extern int sysctl_drop_caches;
2225 int drop_caches_sysctl_handler(struct ctl_table *, int,
2226 void __user *, size_t *, loff_t *);
2229 void drop_slab(void);
2230 void drop_slab_node(int nid);
2233 #define randomize_va_space 0
2235 extern int randomize_va_space;
2238 const char * arch_vma_name(struct vm_area_struct *vma);
2239 void print_vma_addr(char *prefix, unsigned long rip);
2241 void sparse_mem_maps_populate_node(struct page **map_map,
2242 unsigned long pnum_begin,
2243 unsigned long pnum_end,
2244 unsigned long map_count,
2247 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
2248 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
2249 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
2250 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
2251 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
2252 void *vmemmap_alloc_block(unsigned long size, int node);
2254 void *__vmemmap_alloc_block_buf(unsigned long size, int node,
2255 struct vmem_altmap *altmap);
2256 static inline void *vmemmap_alloc_block_buf(unsigned long size, int node)
2258 return __vmemmap_alloc_block_buf(size, node, NULL);
2261 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
2262 int vmemmap_populate_basepages(unsigned long start, unsigned long end,
2264 int vmemmap_populate(unsigned long start, unsigned long end, int node);
2265 void vmemmap_populate_print_last(void);
2266 #ifdef CONFIG_MEMORY_HOTPLUG
2267 void vmemmap_free(unsigned long start, unsigned long end);
2269 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
2270 unsigned long size);
2273 MF_COUNT_INCREASED = 1 << 0,
2274 MF_ACTION_REQUIRED = 1 << 1,
2275 MF_MUST_KILL = 1 << 2,
2276 MF_SOFT_OFFLINE = 1 << 3,
2278 extern int memory_failure(unsigned long pfn, int trapno, int flags);
2279 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
2280 extern int unpoison_memory(unsigned long pfn);
2281 extern int get_hwpoison_page(struct page *page);
2282 #define put_hwpoison_page(page) put_page(page)
2283 extern int sysctl_memory_failure_early_kill;
2284 extern int sysctl_memory_failure_recovery;
2285 extern void shake_page(struct page *p, int access);
2286 extern atomic_long_t num_poisoned_pages;
2287 extern int soft_offline_page(struct page *page, int flags);
2291 * Error handlers for various types of pages.
2294 MF_IGNORED, /* Error: cannot be handled */
2295 MF_FAILED, /* Error: handling failed */
2296 MF_DELAYED, /* Will be handled later */
2297 MF_RECOVERED, /* Successfully recovered */
2300 enum mf_action_page_type {
2302 MF_MSG_KERNEL_HIGH_ORDER,
2304 MF_MSG_DIFFERENT_COMPOUND,
2305 MF_MSG_POISONED_HUGE,
2308 MF_MSG_UNMAP_FAILED,
2309 MF_MSG_DIRTY_SWAPCACHE,
2310 MF_MSG_CLEAN_SWAPCACHE,
2311 MF_MSG_DIRTY_MLOCKED_LRU,
2312 MF_MSG_CLEAN_MLOCKED_LRU,
2313 MF_MSG_DIRTY_UNEVICTABLE_LRU,
2314 MF_MSG_CLEAN_UNEVICTABLE_LRU,
2317 MF_MSG_TRUNCATED_LRU,
2323 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2324 extern void clear_huge_page(struct page *page,
2326 unsigned int pages_per_huge_page);
2327 extern void copy_user_huge_page(struct page *dst, struct page *src,
2328 unsigned long addr, struct vm_area_struct *vma,
2329 unsigned int pages_per_huge_page);
2330 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2332 extern struct page_ext_operations debug_guardpage_ops;
2333 extern struct page_ext_operations page_poisoning_ops;
2335 #ifdef CONFIG_DEBUG_PAGEALLOC
2336 extern unsigned int _debug_guardpage_minorder;
2337 extern bool _debug_guardpage_enabled;
2339 static inline unsigned int debug_guardpage_minorder(void)
2341 return _debug_guardpage_minorder;
2344 static inline bool debug_guardpage_enabled(void)
2346 return _debug_guardpage_enabled;
2349 static inline bool page_is_guard(struct page *page)
2351 struct page_ext *page_ext;
2353 if (!debug_guardpage_enabled())
2356 page_ext = lookup_page_ext(page);
2357 return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
2360 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2361 static inline bool debug_guardpage_enabled(void) { return false; }
2362 static inline bool page_is_guard(struct page *page) { return false; }
2363 #endif /* CONFIG_DEBUG_PAGEALLOC */
2365 #if MAX_NUMNODES > 1
2366 void __init setup_nr_node_ids(void);
2368 static inline void setup_nr_node_ids(void) {}
2371 #endif /* __KERNEL__ */
2372 #endif /* _LINUX_MM_H */