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>
25 #include <linux/page_ref.h>
29 struct anon_vma_chain;
32 struct writeback_control;
35 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
36 extern unsigned long max_mapnr;
38 static inline void set_max_mapnr(unsigned long limit)
43 static inline void set_max_mapnr(unsigned long limit) { }
46 extern unsigned long totalram_pages;
47 extern void * high_memory;
48 extern int page_cluster;
51 extern int sysctl_legacy_va_layout;
53 #define sysctl_legacy_va_layout 0
56 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
57 extern const int mmap_rnd_bits_min;
58 extern const int mmap_rnd_bits_max;
59 extern int mmap_rnd_bits __read_mostly;
61 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
62 extern const int mmap_rnd_compat_bits_min;
63 extern const int mmap_rnd_compat_bits_max;
64 extern int mmap_rnd_compat_bits __read_mostly;
68 #include <asm/pgtable.h>
69 #include <asm/processor.h>
72 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
76 #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
80 #define lm_alias(x) __va(__pa_symbol(x))
84 * To prevent common memory management code establishing
85 * a zero page mapping on a read fault.
86 * This macro should be defined within <asm/pgtable.h>.
87 * s390 does this to prevent multiplexing of hardware bits
88 * related to the physical page in case of virtualization.
90 #ifndef mm_forbids_zeropage
91 #define mm_forbids_zeropage(X) (0)
95 * Default maximum number of active map areas, this limits the number of vmas
96 * per mm struct. Users can overwrite this number by sysctl but there is a
99 * When a program's coredump is generated as ELF format, a section is created
100 * per a vma. In ELF, the number of sections is represented in unsigned short.
101 * This means the number of sections should be smaller than 65535 at coredump.
102 * Because the kernel adds some informative sections to a image of program at
103 * generating coredump, we need some margin. The number of extra sections is
104 * 1-3 now and depends on arch. We use "5" as safe margin, here.
106 * ELF extended numbering allows more than 65535 sections, so 16-bit bound is
107 * not a hard limit any more. Although some userspace tools can be surprised by
110 #define MAPCOUNT_ELF_CORE_MARGIN (5)
111 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
113 extern int sysctl_max_map_count;
115 extern unsigned long sysctl_user_reserve_kbytes;
116 extern unsigned long sysctl_admin_reserve_kbytes;
118 extern int sysctl_overcommit_memory;
119 extern int sysctl_overcommit_ratio;
120 extern unsigned long sysctl_overcommit_kbytes;
122 extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *,
124 extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
127 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
129 /* to align the pointer to the (next) page boundary */
130 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
132 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
133 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE)
136 * Linux kernel virtual memory manager primitives.
137 * The idea being to have a "virtual" mm in the same way
138 * we have a virtual fs - giving a cleaner interface to the
139 * mm details, and allowing different kinds of memory mappings
140 * (from shared memory to executable loading to arbitrary
144 extern struct kmem_cache *vm_area_cachep;
147 extern struct rb_root nommu_region_tree;
148 extern struct rw_semaphore nommu_region_sem;
150 extern unsigned int kobjsize(const void *objp);
154 * vm_flags in vm_area_struct, see mm_types.h.
155 * When changing, update also include/trace/events/mmflags.h
157 #define VM_NONE 0x00000000
159 #define VM_READ 0x00000001 /* currently active flags */
160 #define VM_WRITE 0x00000002
161 #define VM_EXEC 0x00000004
162 #define VM_SHARED 0x00000008
164 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
165 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
166 #define VM_MAYWRITE 0x00000020
167 #define VM_MAYEXEC 0x00000040
168 #define VM_MAYSHARE 0x00000080
170 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
171 #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
172 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
173 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
174 #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
176 #define VM_LOCKED 0x00002000
177 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
179 /* Used by sys_madvise() */
180 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
181 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
183 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
184 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
185 #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
186 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
187 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
188 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
189 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
190 #define VM_ARCH_2 0x02000000
191 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
193 #ifdef CONFIG_MEM_SOFT_DIRTY
194 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
196 # define VM_SOFTDIRTY 0
199 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
200 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
201 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
202 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
204 #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
205 #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */
206 #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */
207 #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */
208 #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */
209 #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0)
210 #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1)
211 #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2)
212 #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3)
213 #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
215 #if defined(CONFIG_X86)
216 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
217 #if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS)
218 # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0
219 # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */
220 # define VM_PKEY_BIT1 VM_HIGH_ARCH_1
221 # define VM_PKEY_BIT2 VM_HIGH_ARCH_2
222 # define VM_PKEY_BIT3 VM_HIGH_ARCH_3
224 #elif defined(CONFIG_PPC)
225 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
226 #elif defined(CONFIG_PARISC)
227 # define VM_GROWSUP VM_ARCH_1
228 #elif defined(CONFIG_METAG)
229 # define VM_GROWSUP VM_ARCH_1
230 #elif defined(CONFIG_IA64)
231 # define VM_GROWSUP VM_ARCH_1
232 #elif !defined(CONFIG_MMU)
233 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
236 #if defined(CONFIG_X86)
237 /* MPX specific bounds table or bounds directory */
238 # define VM_MPX VM_ARCH_2
242 # define VM_GROWSUP VM_NONE
245 /* Bits set in the VMA until the stack is in its final location */
246 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
248 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
249 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
252 #ifdef CONFIG_STACK_GROWSUP
253 #define VM_STACK VM_GROWSUP
255 #define VM_STACK VM_GROWSDOWN
258 #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
261 * Special vmas that are non-mergable, non-mlock()able.
262 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
264 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
266 /* This mask defines which mm->def_flags a process can inherit its parent */
267 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
269 /* This mask is used to clear all the VMA flags used by mlock */
270 #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
273 * mapping from the currently active vm_flags protection bits (the
274 * low four bits) to a page protection mask..
276 extern pgprot_t protection_map[16];
278 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
279 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
280 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
281 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
282 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
283 #define FAULT_FLAG_TRIED 0x20 /* Second try */
284 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
285 #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */
286 #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */
289 * vm_fault is filled by the the pagefault handler and passed to the vma's
290 * ->fault function. The vma's ->fault is responsible for returning a bitmask
291 * of VM_FAULT_xxx flags that give details about how the fault was handled.
293 * MM layer fills up gfp_mask for page allocations but fault handler might
294 * alter it if its implementation requires a different allocation context.
296 * pgoff should be used in favour of virtual_address, if possible.
299 struct vm_area_struct *vma; /* Target VMA */
300 unsigned int flags; /* FAULT_FLAG_xxx flags */
301 gfp_t gfp_mask; /* gfp mask to be used for allocations */
302 pgoff_t pgoff; /* Logical page offset based on vma */
303 unsigned long address; /* Faulting virtual address */
304 pmd_t *pmd; /* Pointer to pmd entry matching
306 pte_t orig_pte; /* Value of PTE at the time of fault */
308 struct page *cow_page; /* Page handler may use for COW fault */
309 struct mem_cgroup *memcg; /* Cgroup cow_page belongs to */
310 struct page *page; /* ->fault handlers should return a
311 * page here, unless VM_FAULT_NOPAGE
312 * is set (which is also implied by
315 /* These three entries are valid only while holding ptl lock */
316 pte_t *pte; /* Pointer to pte entry matching
317 * the 'address'. NULL if the page
318 * table hasn't been allocated.
320 spinlock_t *ptl; /* Page table lock.
321 * Protects pte page table if 'pte'
322 * is not NULL, otherwise pmd.
324 pgtable_t prealloc_pte; /* Pre-allocated pte page table.
325 * vm_ops->map_pages() calls
326 * alloc_set_pte() from atomic context.
327 * do_fault_around() pre-allocates
328 * page table to avoid allocation from
334 * These are the virtual MM functions - opening of an area, closing and
335 * unmapping it (needed to keep files on disk up-to-date etc), pointer
336 * to the functions called when a no-page or a wp-page exception occurs.
338 struct vm_operations_struct {
339 void (*open)(struct vm_area_struct * area);
340 void (*close)(struct vm_area_struct * area);
341 int (*mremap)(struct vm_area_struct * area);
342 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
343 int (*pmd_fault)(struct vm_area_struct *, unsigned long address,
344 pmd_t *, unsigned int flags);
345 void (*map_pages)(struct vm_fault *vmf,
346 pgoff_t start_pgoff, pgoff_t end_pgoff);
348 /* notification that a previously read-only page is about to become
349 * writable, if an error is returned it will cause a SIGBUS */
350 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
352 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
353 int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
355 /* called by access_process_vm when get_user_pages() fails, typically
356 * for use by special VMAs that can switch between memory and hardware
358 int (*access)(struct vm_area_struct *vma, unsigned long addr,
359 void *buf, int len, int write);
361 /* Called by the /proc/PID/maps code to ask the vma whether it
362 * has a special name. Returning non-NULL will also cause this
363 * vma to be dumped unconditionally. */
364 const char *(*name)(struct vm_area_struct *vma);
368 * set_policy() op must add a reference to any non-NULL @new mempolicy
369 * to hold the policy upon return. Caller should pass NULL @new to
370 * remove a policy and fall back to surrounding context--i.e. do not
371 * install a MPOL_DEFAULT policy, nor the task or system default
374 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
377 * get_policy() op must add reference [mpol_get()] to any policy at
378 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
379 * in mm/mempolicy.c will do this automatically.
380 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
381 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
382 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
383 * must return NULL--i.e., do not "fallback" to task or system default
386 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
390 * Called by vm_normal_page() for special PTEs to find the
391 * page for @addr. This is useful if the default behavior
392 * (using pte_page()) would not find the correct page.
394 struct page *(*find_special_page)(struct vm_area_struct *vma,
401 #define page_private(page) ((page)->private)
402 #define set_page_private(page, v) ((page)->private = (v))
404 #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
405 static inline int pmd_devmap(pmd_t pmd)
412 * FIXME: take this include out, include page-flags.h in
413 * files which need it (119 of them)
415 #include <linux/page-flags.h>
416 #include <linux/huge_mm.h>
419 * Methods to modify the page usage count.
421 * What counts for a page usage:
422 * - cache mapping (page->mapping)
423 * - private data (page->private)
424 * - page mapped in a task's page tables, each mapping
425 * is counted separately
427 * Also, many kernel routines increase the page count before a critical
428 * routine so they can be sure the page doesn't go away from under them.
432 * Drop a ref, return true if the refcount fell to zero (the page has no users)
434 static inline int put_page_testzero(struct page *page)
436 VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);
437 return page_ref_dec_and_test(page);
441 * Try to grab a ref unless the page has a refcount of zero, return false if
443 * This can be called when MMU is off so it must not access
444 * any of the virtual mappings.
446 static inline int get_page_unless_zero(struct page *page)
448 return page_ref_add_unless(page, 1, 0);
451 extern int page_is_ram(unsigned long pfn);
459 int region_intersects(resource_size_t offset, size_t size, unsigned long flags,
462 /* Support for virtually mapped pages */
463 struct page *vmalloc_to_page(const void *addr);
464 unsigned long vmalloc_to_pfn(const void *addr);
467 * Determine if an address is within the vmalloc range
469 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
470 * is no special casing required.
472 static inline bool is_vmalloc_addr(const void *x)
475 unsigned long addr = (unsigned long)x;
477 return addr >= VMALLOC_START && addr < VMALLOC_END;
483 extern int is_vmalloc_or_module_addr(const void *x);
485 static inline int is_vmalloc_or_module_addr(const void *x)
491 extern void kvfree(const void *addr);
493 static inline atomic_t *compound_mapcount_ptr(struct page *page)
495 return &page[1].compound_mapcount;
498 static inline int compound_mapcount(struct page *page)
500 VM_BUG_ON_PAGE(!PageCompound(page), page);
501 page = compound_head(page);
502 return atomic_read(compound_mapcount_ptr(page)) + 1;
506 * The atomic page->_mapcount, starts from -1: so that transitions
507 * both from it and to it can be tracked, using atomic_inc_and_test
508 * and atomic_add_negative(-1).
510 static inline void page_mapcount_reset(struct page *page)
512 atomic_set(&(page)->_mapcount, -1);
515 int __page_mapcount(struct page *page);
517 static inline int page_mapcount(struct page *page)
519 VM_BUG_ON_PAGE(PageSlab(page), page);
521 if (unlikely(PageCompound(page)))
522 return __page_mapcount(page);
523 return atomic_read(&page->_mapcount) + 1;
526 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
527 int total_mapcount(struct page *page);
528 int page_trans_huge_mapcount(struct page *page, int *total_mapcount);
530 static inline int total_mapcount(struct page *page)
532 return page_mapcount(page);
534 static inline int page_trans_huge_mapcount(struct page *page,
537 int mapcount = page_mapcount(page);
539 *total_mapcount = mapcount;
544 static inline struct page *virt_to_head_page(const void *x)
546 struct page *page = virt_to_page(x);
548 return compound_head(page);
551 void __put_page(struct page *page);
553 void put_pages_list(struct list_head *pages);
555 void split_page(struct page *page, unsigned int order);
558 * Compound pages have a destructor function. Provide a
559 * prototype for that function and accessor functions.
560 * These are _only_ valid on the head of a compound page.
562 typedef void compound_page_dtor(struct page *);
564 /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
565 enum compound_dtor_id {
568 #ifdef CONFIG_HUGETLB_PAGE
571 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
576 extern compound_page_dtor * const compound_page_dtors[];
578 static inline void set_compound_page_dtor(struct page *page,
579 enum compound_dtor_id compound_dtor)
581 VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page);
582 page[1].compound_dtor = compound_dtor;
585 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
587 VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page);
588 return compound_page_dtors[page[1].compound_dtor];
591 static inline unsigned int compound_order(struct page *page)
595 return page[1].compound_order;
598 static inline void set_compound_order(struct page *page, unsigned int order)
600 page[1].compound_order = order;
603 void free_compound_page(struct page *page);
607 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
608 * servicing faults for write access. In the normal case, do always want
609 * pte_mkwrite. But get_user_pages can cause write faults for mappings
610 * that do not have writing enabled, when used by access_process_vm.
612 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
614 if (likely(vma->vm_flags & VM_WRITE))
615 pte = pte_mkwrite(pte);
619 int alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg,
621 int finish_fault(struct vm_fault *vmf);
622 int finish_mkwrite_fault(struct vm_fault *vmf);
626 * Multiple processes may "see" the same page. E.g. for untouched
627 * mappings of /dev/null, all processes see the same page full of
628 * zeroes, and text pages of executables and shared libraries have
629 * only one copy in memory, at most, normally.
631 * For the non-reserved pages, page_count(page) denotes a reference count.
632 * page_count() == 0 means the page is free. page->lru is then used for
633 * freelist management in the buddy allocator.
634 * page_count() > 0 means the page has been allocated.
636 * Pages are allocated by the slab allocator in order to provide memory
637 * to kmalloc and kmem_cache_alloc. In this case, the management of the
638 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
639 * unless a particular usage is carefully commented. (the responsibility of
640 * freeing the kmalloc memory is the caller's, of course).
642 * A page may be used by anyone else who does a __get_free_page().
643 * In this case, page_count still tracks the references, and should only
644 * be used through the normal accessor functions. The top bits of page->flags
645 * and page->virtual store page management information, but all other fields
646 * are unused and could be used privately, carefully. The management of this
647 * page is the responsibility of the one who allocated it, and those who have
648 * subsequently been given references to it.
650 * The other pages (we may call them "pagecache pages") are completely
651 * managed by the Linux memory manager: I/O, buffers, swapping etc.
652 * The following discussion applies only to them.
654 * A pagecache page contains an opaque `private' member, which belongs to the
655 * page's address_space. Usually, this is the address of a circular list of
656 * the page's disk buffers. PG_private must be set to tell the VM to call
657 * into the filesystem to release these pages.
659 * A page may belong to an inode's memory mapping. In this case, page->mapping
660 * is the pointer to the inode, and page->index is the file offset of the page,
661 * in units of PAGE_SIZE.
663 * If pagecache pages are not associated with an inode, they are said to be
664 * anonymous pages. These may become associated with the swapcache, and in that
665 * case PG_swapcache is set, and page->private is an offset into the swapcache.
667 * In either case (swapcache or inode backed), the pagecache itself holds one
668 * reference to the page. Setting PG_private should also increment the
669 * refcount. The each user mapping also has a reference to the page.
671 * The pagecache pages are stored in a per-mapping radix tree, which is
672 * rooted at mapping->page_tree, and indexed by offset.
673 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
674 * lists, we instead now tag pages as dirty/writeback in the radix tree.
676 * All pagecache pages may be subject to I/O:
677 * - inode pages may need to be read from disk,
678 * - inode pages which have been modified and are MAP_SHARED may need
679 * to be written back to the inode on disk,
680 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
681 * modified may need to be swapped out to swap space and (later) to be read
686 * The zone field is never updated after free_area_init_core()
687 * sets it, so none of the operations on it need to be atomic.
690 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
691 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
692 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
693 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
694 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
697 * Define the bit shifts to access each section. For non-existent
698 * sections we define the shift as 0; that plus a 0 mask ensures
699 * the compiler will optimise away reference to them.
701 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
702 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
703 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
704 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
706 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
707 #ifdef NODE_NOT_IN_PAGE_FLAGS
708 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
709 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
710 SECTIONS_PGOFF : ZONES_PGOFF)
712 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
713 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
714 NODES_PGOFF : ZONES_PGOFF)
717 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
719 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
720 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
723 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
724 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
725 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
726 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
727 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
729 static inline enum zone_type page_zonenum(const struct page *page)
731 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
734 #ifdef CONFIG_ZONE_DEVICE
735 void get_zone_device_page(struct page *page);
736 void put_zone_device_page(struct page *page);
737 static inline bool is_zone_device_page(const struct page *page)
739 return page_zonenum(page) == ZONE_DEVICE;
742 static inline void get_zone_device_page(struct page *page)
745 static inline void put_zone_device_page(struct page *page)
748 static inline bool is_zone_device_page(const struct page *page)
754 static inline void get_page(struct page *page)
756 page = compound_head(page);
758 * Getting a normal page or the head of a compound page
759 * requires to already have an elevated page->_refcount.
761 VM_BUG_ON_PAGE(page_ref_count(page) <= 0, page);
764 if (unlikely(is_zone_device_page(page)))
765 get_zone_device_page(page);
768 static inline void put_page(struct page *page)
770 page = compound_head(page);
772 if (put_page_testzero(page))
775 if (unlikely(is_zone_device_page(page)))
776 put_zone_device_page(page);
779 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
780 #define SECTION_IN_PAGE_FLAGS
784 * The identification function is mainly used by the buddy allocator for
785 * determining if two pages could be buddies. We are not really identifying
786 * the zone since we could be using the section number id if we do not have
787 * node id available in page flags.
788 * We only guarantee that it will return the same value for two combinable
791 static inline int page_zone_id(struct page *page)
793 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
796 static inline int zone_to_nid(struct zone *zone)
805 #ifdef NODE_NOT_IN_PAGE_FLAGS
806 extern int page_to_nid(const struct page *page);
808 static inline int page_to_nid(const struct page *page)
810 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
814 #ifdef CONFIG_NUMA_BALANCING
815 static inline int cpu_pid_to_cpupid(int cpu, int pid)
817 return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
820 static inline int cpupid_to_pid(int cpupid)
822 return cpupid & LAST__PID_MASK;
825 static inline int cpupid_to_cpu(int cpupid)
827 return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
830 static inline int cpupid_to_nid(int cpupid)
832 return cpu_to_node(cpupid_to_cpu(cpupid));
835 static inline bool cpupid_pid_unset(int cpupid)
837 return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
840 static inline bool cpupid_cpu_unset(int cpupid)
842 return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
845 static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
847 return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
850 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
851 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
852 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
854 return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
857 static inline int page_cpupid_last(struct page *page)
859 return page->_last_cpupid;
861 static inline void page_cpupid_reset_last(struct page *page)
863 page->_last_cpupid = -1 & LAST_CPUPID_MASK;
866 static inline int page_cpupid_last(struct page *page)
868 return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
871 extern int page_cpupid_xchg_last(struct page *page, int cpupid);
873 static inline void page_cpupid_reset_last(struct page *page)
875 page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT;
877 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
878 #else /* !CONFIG_NUMA_BALANCING */
879 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
881 return page_to_nid(page); /* XXX */
884 static inline int page_cpupid_last(struct page *page)
886 return page_to_nid(page); /* XXX */
889 static inline int cpupid_to_nid(int cpupid)
894 static inline int cpupid_to_pid(int cpupid)
899 static inline int cpupid_to_cpu(int cpupid)
904 static inline int cpu_pid_to_cpupid(int nid, int pid)
909 static inline bool cpupid_pid_unset(int cpupid)
914 static inline void page_cpupid_reset_last(struct page *page)
918 static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
922 #endif /* CONFIG_NUMA_BALANCING */
924 static inline struct zone *page_zone(const struct page *page)
926 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
929 static inline pg_data_t *page_pgdat(const struct page *page)
931 return NODE_DATA(page_to_nid(page));
934 #ifdef SECTION_IN_PAGE_FLAGS
935 static inline void set_page_section(struct page *page, unsigned long section)
937 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
938 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
941 static inline unsigned long page_to_section(const struct page *page)
943 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
947 static inline void set_page_zone(struct page *page, enum zone_type zone)
949 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
950 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
953 static inline void set_page_node(struct page *page, unsigned long node)
955 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
956 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
959 static inline void set_page_links(struct page *page, enum zone_type zone,
960 unsigned long node, unsigned long pfn)
962 set_page_zone(page, zone);
963 set_page_node(page, node);
964 #ifdef SECTION_IN_PAGE_FLAGS
965 set_page_section(page, pfn_to_section_nr(pfn));
970 static inline struct mem_cgroup *page_memcg(struct page *page)
972 return page->mem_cgroup;
974 static inline struct mem_cgroup *page_memcg_rcu(struct page *page)
976 WARN_ON_ONCE(!rcu_read_lock_held());
977 return READ_ONCE(page->mem_cgroup);
980 static inline struct mem_cgroup *page_memcg(struct page *page)
984 static inline struct mem_cgroup *page_memcg_rcu(struct page *page)
986 WARN_ON_ONCE(!rcu_read_lock_held());
992 * Some inline functions in vmstat.h depend on page_zone()
994 #include <linux/vmstat.h>
996 static __always_inline void *lowmem_page_address(const struct page *page)
998 return page_to_virt(page);
1001 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
1002 #define HASHED_PAGE_VIRTUAL
1005 #if defined(WANT_PAGE_VIRTUAL)
1006 static inline void *page_address(const struct page *page)
1008 return page->virtual;
1010 static inline void set_page_address(struct page *page, void *address)
1012 page->virtual = address;
1014 #define page_address_init() do { } while(0)
1017 #if defined(HASHED_PAGE_VIRTUAL)
1018 void *page_address(const struct page *page);
1019 void set_page_address(struct page *page, void *virtual);
1020 void page_address_init(void);
1023 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
1024 #define page_address(page) lowmem_page_address(page)
1025 #define set_page_address(page, address) do { } while(0)
1026 #define page_address_init() do { } while(0)
1029 extern void *page_rmapping(struct page *page);
1030 extern struct anon_vma *page_anon_vma(struct page *page);
1031 extern struct address_space *page_mapping(struct page *page);
1033 extern struct address_space *__page_file_mapping(struct page *);
1036 struct address_space *page_file_mapping(struct page *page)
1038 if (unlikely(PageSwapCache(page)))
1039 return __page_file_mapping(page);
1041 return page->mapping;
1044 extern pgoff_t __page_file_index(struct page *page);
1047 * Return the pagecache index of the passed page. Regular pagecache pages
1048 * use ->index whereas swapcache pages use swp_offset(->private)
1050 static inline pgoff_t page_index(struct page *page)
1052 if (unlikely(PageSwapCache(page)))
1053 return __page_file_index(page);
1057 bool page_mapped(struct page *page);
1058 struct address_space *page_mapping(struct page *page);
1061 * Return true only if the page has been allocated with
1062 * ALLOC_NO_WATERMARKS and the low watermark was not
1063 * met implying that the system is under some pressure.
1065 static inline bool page_is_pfmemalloc(struct page *page)
1068 * Page index cannot be this large so this must be
1069 * a pfmemalloc page.
1071 return page->index == -1UL;
1075 * Only to be called by the page allocator on a freshly allocated
1078 static inline void set_page_pfmemalloc(struct page *page)
1083 static inline void clear_page_pfmemalloc(struct page *page)
1089 * Different kinds of faults, as returned by handle_mm_fault().
1090 * Used to decide whether a process gets delivered SIGBUS or
1091 * just gets major/minor fault counters bumped up.
1094 #define VM_FAULT_OOM 0x0001
1095 #define VM_FAULT_SIGBUS 0x0002
1096 #define VM_FAULT_MAJOR 0x0004
1097 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1098 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1099 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1100 #define VM_FAULT_SIGSEGV 0x0040
1102 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1103 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1104 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1105 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1106 #define VM_FAULT_DONE_COW 0x1000 /* ->fault has fully handled COW */
1108 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1110 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1111 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1114 /* Encode hstate index for a hwpoisoned large page */
1115 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1116 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1119 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1121 extern void pagefault_out_of_memory(void);
1123 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1126 * Flags passed to show_mem() and show_free_areas() to suppress output in
1129 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1131 extern void show_free_areas(unsigned int flags);
1132 extern bool skip_free_areas_node(unsigned int flags, int nid);
1134 int shmem_zero_setup(struct vm_area_struct *);
1136 bool shmem_mapping(struct address_space *mapping);
1138 static inline bool shmem_mapping(struct address_space *mapping)
1144 extern bool can_do_mlock(void);
1145 extern int user_shm_lock(size_t, struct user_struct *);
1146 extern void user_shm_unlock(size_t, struct user_struct *);
1149 * Parameter block passed down to zap_pte_range in exceptional cases.
1151 struct zap_details {
1152 struct address_space *check_mapping; /* Check page->mapping if set */
1153 pgoff_t first_index; /* Lowest page->index to unmap */
1154 pgoff_t last_index; /* Highest page->index to unmap */
1155 bool ignore_dirty; /* Ignore dirty pages */
1156 bool check_swap_entries; /* Check also swap entries */
1159 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
1161 struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
1164 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1165 unsigned long size);
1166 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
1167 unsigned long size, struct zap_details *);
1168 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
1169 unsigned long start, unsigned long end);
1172 * mm_walk - callbacks for walk_page_range
1173 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1174 * this handler is required to be able to handle
1175 * pmd_trans_huge() pmds. They may simply choose to
1176 * split_huge_page() instead of handling it explicitly.
1177 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1178 * @pte_hole: if set, called for each hole at all levels
1179 * @hugetlb_entry: if set, called for each hugetlb entry
1180 * @test_walk: caller specific callback function to determine whether
1181 * we walk over the current vma or not. Returning 0
1182 * value means "do page table walk over the current vma,"
1183 * and a negative one means "abort current page table walk
1184 * right now." 1 means "skip the current vma."
1185 * @mm: mm_struct representing the target process of page table walk
1186 * @vma: vma currently walked (NULL if walking outside vmas)
1187 * @private: private data for callbacks' usage
1189 * (see the comment on walk_page_range() for more details)
1192 int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1193 unsigned long next, struct mm_walk *walk);
1194 int (*pte_entry)(pte_t *pte, unsigned long addr,
1195 unsigned long next, struct mm_walk *walk);
1196 int (*pte_hole)(unsigned long addr, unsigned long next,
1197 struct mm_walk *walk);
1198 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1199 unsigned long addr, unsigned long next,
1200 struct mm_walk *walk);
1201 int (*test_walk)(unsigned long addr, unsigned long next,
1202 struct mm_walk *walk);
1203 struct mm_struct *mm;
1204 struct vm_area_struct *vma;
1208 int walk_page_range(unsigned long addr, unsigned long end,
1209 struct mm_walk *walk);
1210 int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
1211 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1212 unsigned long end, unsigned long floor, unsigned long ceiling);
1213 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1214 struct vm_area_struct *vma);
1215 void unmap_mapping_range(struct address_space *mapping,
1216 loff_t const holebegin, loff_t const holelen, int even_cows);
1217 int follow_pte_pmd(struct mm_struct *mm, unsigned long address,
1218 pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp);
1219 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1220 unsigned long *pfn);
1221 int follow_phys(struct vm_area_struct *vma, unsigned long address,
1222 unsigned int flags, unsigned long *prot, resource_size_t *phys);
1223 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1224 void *buf, int len, int write);
1226 static inline void unmap_shared_mapping_range(struct address_space *mapping,
1227 loff_t const holebegin, loff_t const holelen)
1229 unmap_mapping_range(mapping, holebegin, holelen, 0);
1232 extern void truncate_pagecache(struct inode *inode, loff_t new);
1233 extern void truncate_setsize(struct inode *inode, loff_t newsize);
1234 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
1235 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1236 int truncate_inode_page(struct address_space *mapping, struct page *page);
1237 int generic_error_remove_page(struct address_space *mapping, struct page *page);
1238 int invalidate_inode_page(struct page *page);
1241 extern int handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
1242 unsigned int flags);
1243 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1244 unsigned long address, unsigned int fault_flags,
1247 static inline int handle_mm_fault(struct vm_area_struct *vma,
1248 unsigned long address, unsigned int flags)
1250 /* should never happen if there's no MMU */
1252 return VM_FAULT_SIGBUS;
1254 static inline int fixup_user_fault(struct task_struct *tsk,
1255 struct mm_struct *mm, unsigned long address,
1256 unsigned int fault_flags, bool *unlocked)
1258 /* should never happen if there's no MMU */
1264 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len,
1265 unsigned int gup_flags);
1266 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1267 void *buf, int len, unsigned int gup_flags);
1268 extern int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
1269 unsigned long addr, void *buf, int len, unsigned int gup_flags);
1271 long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
1272 unsigned long start, unsigned long nr_pages,
1273 unsigned int gup_flags, struct page **pages,
1274 struct vm_area_struct **vmas, int *locked);
1275 long get_user_pages(unsigned long start, unsigned long nr_pages,
1276 unsigned int gup_flags, struct page **pages,
1277 struct vm_area_struct **vmas);
1278 long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
1279 unsigned int gup_flags, struct page **pages, int *locked);
1280 long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
1281 struct page **pages, unsigned int gup_flags);
1282 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1283 struct page **pages);
1285 /* Container for pinned pfns / pages */
1286 struct frame_vector {
1287 unsigned int nr_allocated; /* Number of frames we have space for */
1288 unsigned int nr_frames; /* Number of frames stored in ptrs array */
1289 bool got_ref; /* Did we pin pages by getting page ref? */
1290 bool is_pfns; /* Does array contain pages or pfns? */
1291 void *ptrs[0]; /* Array of pinned pfns / pages. Use
1292 * pfns_vector_pages() or pfns_vector_pfns()
1296 struct frame_vector *frame_vector_create(unsigned int nr_frames);
1297 void frame_vector_destroy(struct frame_vector *vec);
1298 int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
1299 unsigned int gup_flags, struct frame_vector *vec);
1300 void put_vaddr_frames(struct frame_vector *vec);
1301 int frame_vector_to_pages(struct frame_vector *vec);
1302 void frame_vector_to_pfns(struct frame_vector *vec);
1304 static inline unsigned int frame_vector_count(struct frame_vector *vec)
1306 return vec->nr_frames;
1309 static inline struct page **frame_vector_pages(struct frame_vector *vec)
1312 int err = frame_vector_to_pages(vec);
1315 return ERR_PTR(err);
1317 return (struct page **)(vec->ptrs);
1320 static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
1323 frame_vector_to_pfns(vec);
1324 return (unsigned long *)(vec->ptrs);
1328 int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1329 struct page **pages);
1330 int get_kernel_page(unsigned long start, int write, struct page **pages);
1331 struct page *get_dump_page(unsigned long addr);
1333 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1334 extern void do_invalidatepage(struct page *page, unsigned int offset,
1335 unsigned int length);
1337 int __set_page_dirty_nobuffers(struct page *page);
1338 int __set_page_dirty_no_writeback(struct page *page);
1339 int redirty_page_for_writepage(struct writeback_control *wbc,
1341 void account_page_dirtied(struct page *page, struct address_space *mapping);
1342 void account_page_cleaned(struct page *page, struct address_space *mapping,
1343 struct bdi_writeback *wb);
1344 int set_page_dirty(struct page *page);
1345 int set_page_dirty_lock(struct page *page);
1346 void cancel_dirty_page(struct page *page);
1347 int clear_page_dirty_for_io(struct page *page);
1349 int get_cmdline(struct task_struct *task, char *buffer, int buflen);
1351 /* Is the vma a continuation of the stack vma above it? */
1352 static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1354 return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
1357 static inline bool vma_is_anonymous(struct vm_area_struct *vma)
1359 return !vma->vm_ops;
1362 static inline int stack_guard_page_start(struct vm_area_struct *vma,
1365 return (vma->vm_flags & VM_GROWSDOWN) &&
1366 (vma->vm_start == addr) &&
1367 !vma_growsdown(vma->vm_prev, addr);
1370 /* Is the vma a continuation of the stack vma below it? */
1371 static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
1373 return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
1376 static inline int stack_guard_page_end(struct vm_area_struct *vma,
1379 return (vma->vm_flags & VM_GROWSUP) &&
1380 (vma->vm_end == addr) &&
1381 !vma_growsup(vma->vm_next, addr);
1384 int vma_is_stack_for_current(struct vm_area_struct *vma);
1386 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1387 unsigned long old_addr, struct vm_area_struct *new_vma,
1388 unsigned long new_addr, unsigned long len,
1389 bool need_rmap_locks);
1390 extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1391 unsigned long end, pgprot_t newprot,
1392 int dirty_accountable, int prot_numa);
1393 extern int mprotect_fixup(struct vm_area_struct *vma,
1394 struct vm_area_struct **pprev, unsigned long start,
1395 unsigned long end, unsigned long newflags);
1398 * doesn't attempt to fault and will return short.
1400 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1401 struct page **pages);
1403 * per-process(per-mm_struct) statistics.
1405 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1407 long val = atomic_long_read(&mm->rss_stat.count[member]);
1409 #ifdef SPLIT_RSS_COUNTING
1411 * counter is updated in asynchronous manner and may go to minus.
1412 * But it's never be expected number for users.
1417 return (unsigned long)val;
1420 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1422 atomic_long_add(value, &mm->rss_stat.count[member]);
1425 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1427 atomic_long_inc(&mm->rss_stat.count[member]);
1430 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1432 atomic_long_dec(&mm->rss_stat.count[member]);
1435 /* Optimized variant when page is already known not to be PageAnon */
1436 static inline int mm_counter_file(struct page *page)
1438 if (PageSwapBacked(page))
1439 return MM_SHMEMPAGES;
1440 return MM_FILEPAGES;
1443 static inline int mm_counter(struct page *page)
1446 return MM_ANONPAGES;
1447 return mm_counter_file(page);
1450 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1452 return get_mm_counter(mm, MM_FILEPAGES) +
1453 get_mm_counter(mm, MM_ANONPAGES) +
1454 get_mm_counter(mm, MM_SHMEMPAGES);
1457 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1459 return max(mm->hiwater_rss, get_mm_rss(mm));
1462 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1464 return max(mm->hiwater_vm, mm->total_vm);
1467 static inline void update_hiwater_rss(struct mm_struct *mm)
1469 unsigned long _rss = get_mm_rss(mm);
1471 if ((mm)->hiwater_rss < _rss)
1472 (mm)->hiwater_rss = _rss;
1475 static inline void update_hiwater_vm(struct mm_struct *mm)
1477 if (mm->hiwater_vm < mm->total_vm)
1478 mm->hiwater_vm = mm->total_vm;
1481 static inline void reset_mm_hiwater_rss(struct mm_struct *mm)
1483 mm->hiwater_rss = get_mm_rss(mm);
1486 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1487 struct mm_struct *mm)
1489 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1491 if (*maxrss < hiwater_rss)
1492 *maxrss = hiwater_rss;
1495 #if defined(SPLIT_RSS_COUNTING)
1496 void sync_mm_rss(struct mm_struct *mm);
1498 static inline void sync_mm_rss(struct mm_struct *mm)
1503 #ifndef __HAVE_ARCH_PTE_DEVMAP
1504 static inline int pte_devmap(pte_t pte)
1510 int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot);
1512 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1514 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1518 __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1522 #ifdef __PAGETABLE_PUD_FOLDED
1523 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1524 unsigned long address)
1529 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1532 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1533 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1534 unsigned long address)
1539 static inline void mm_nr_pmds_init(struct mm_struct *mm) {}
1541 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1546 static inline void mm_inc_nr_pmds(struct mm_struct *mm) {}
1547 static inline void mm_dec_nr_pmds(struct mm_struct *mm) {}
1550 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1552 static inline void mm_nr_pmds_init(struct mm_struct *mm)
1554 atomic_long_set(&mm->nr_pmds, 0);
1557 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1559 return atomic_long_read(&mm->nr_pmds);
1562 static inline void mm_inc_nr_pmds(struct mm_struct *mm)
1564 atomic_long_inc(&mm->nr_pmds);
1567 static inline void mm_dec_nr_pmds(struct mm_struct *mm)
1569 atomic_long_dec(&mm->nr_pmds);
1573 int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
1574 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1577 * The following ifdef needed to get the 4level-fixup.h header to work.
1578 * Remove it when 4level-fixup.h has been removed.
1580 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1581 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1583 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1584 NULL: pud_offset(pgd, address);
1587 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1589 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1590 NULL: pmd_offset(pud, address);
1592 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1594 #if USE_SPLIT_PTE_PTLOCKS
1595 #if ALLOC_SPLIT_PTLOCKS
1596 void __init ptlock_cache_init(void);
1597 extern bool ptlock_alloc(struct page *page);
1598 extern void ptlock_free(struct page *page);
1600 static inline spinlock_t *ptlock_ptr(struct page *page)
1604 #else /* ALLOC_SPLIT_PTLOCKS */
1605 static inline void ptlock_cache_init(void)
1609 static inline bool ptlock_alloc(struct page *page)
1614 static inline void ptlock_free(struct page *page)
1618 static inline spinlock_t *ptlock_ptr(struct page *page)
1622 #endif /* ALLOC_SPLIT_PTLOCKS */
1624 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1626 return ptlock_ptr(pmd_page(*pmd));
1629 static inline bool ptlock_init(struct page *page)
1632 * prep_new_page() initialize page->private (and therefore page->ptl)
1633 * with 0. Make sure nobody took it in use in between.
1635 * It can happen if arch try to use slab for page table allocation:
1636 * slab code uses page->slab_cache, which share storage with page->ptl.
1638 VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
1639 if (!ptlock_alloc(page))
1641 spin_lock_init(ptlock_ptr(page));
1645 /* Reset page->mapping so free_pages_check won't complain. */
1646 static inline void pte_lock_deinit(struct page *page)
1648 page->mapping = NULL;
1652 #else /* !USE_SPLIT_PTE_PTLOCKS */
1654 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1656 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1658 return &mm->page_table_lock;
1660 static inline void ptlock_cache_init(void) {}
1661 static inline bool ptlock_init(struct page *page) { return true; }
1662 static inline void pte_lock_deinit(struct page *page) {}
1663 #endif /* USE_SPLIT_PTE_PTLOCKS */
1665 static inline void pgtable_init(void)
1667 ptlock_cache_init();
1668 pgtable_cache_init();
1671 static inline bool pgtable_page_ctor(struct page *page)
1673 if (!ptlock_init(page))
1675 inc_zone_page_state(page, NR_PAGETABLE);
1679 static inline void pgtable_page_dtor(struct page *page)
1681 pte_lock_deinit(page);
1682 dec_zone_page_state(page, NR_PAGETABLE);
1685 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1687 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1688 pte_t *__pte = pte_offset_map(pmd, address); \
1694 #define pte_unmap_unlock(pte, ptl) do { \
1699 #define pte_alloc(mm, pmd, address) \
1700 (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd, address))
1702 #define pte_alloc_map(mm, pmd, address) \
1703 (pte_alloc(mm, pmd, address) ? NULL : pte_offset_map(pmd, address))
1705 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1706 (pte_alloc(mm, pmd, address) ? \
1707 NULL : pte_offset_map_lock(mm, pmd, address, ptlp))
1709 #define pte_alloc_kernel(pmd, address) \
1710 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1711 NULL: pte_offset_kernel(pmd, address))
1713 #if USE_SPLIT_PMD_PTLOCKS
1715 static struct page *pmd_to_page(pmd_t *pmd)
1717 unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
1718 return virt_to_page((void *)((unsigned long) pmd & mask));
1721 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1723 return ptlock_ptr(pmd_to_page(pmd));
1726 static inline bool pgtable_pmd_page_ctor(struct page *page)
1728 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1729 page->pmd_huge_pte = NULL;
1731 return ptlock_init(page);
1734 static inline void pgtable_pmd_page_dtor(struct page *page)
1736 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1737 VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
1742 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1746 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1748 return &mm->page_table_lock;
1751 static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
1752 static inline void pgtable_pmd_page_dtor(struct page *page) {}
1754 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1758 static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
1760 spinlock_t *ptl = pmd_lockptr(mm, pmd);
1765 extern void __init pagecache_init(void);
1767 extern void free_area_init(unsigned long * zones_size);
1768 extern void free_area_init_node(int nid, unsigned long * zones_size,
1769 unsigned long zone_start_pfn, unsigned long *zholes_size);
1770 extern void free_initmem(void);
1773 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1774 * into the buddy system. The freed pages will be poisoned with pattern
1775 * "poison" if it's within range [0, UCHAR_MAX].
1776 * Return pages freed into the buddy system.
1778 extern unsigned long free_reserved_area(void *start, void *end,
1779 int poison, char *s);
1781 #ifdef CONFIG_HIGHMEM
1783 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1784 * and totalram_pages.
1786 extern void free_highmem_page(struct page *page);
1789 extern void adjust_managed_page_count(struct page *page, long count);
1790 extern void mem_init_print_info(const char *str);
1792 extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end);
1794 /* Free the reserved page into the buddy system, so it gets managed. */
1795 static inline void __free_reserved_page(struct page *page)
1797 ClearPageReserved(page);
1798 init_page_count(page);
1802 static inline void free_reserved_page(struct page *page)
1804 __free_reserved_page(page);
1805 adjust_managed_page_count(page, 1);
1808 static inline void mark_page_reserved(struct page *page)
1810 SetPageReserved(page);
1811 adjust_managed_page_count(page, -1);
1815 * Default method to free all the __init memory into the buddy system.
1816 * The freed pages will be poisoned with pattern "poison" if it's within
1817 * range [0, UCHAR_MAX].
1818 * Return pages freed into the buddy system.
1820 static inline unsigned long free_initmem_default(int poison)
1822 extern char __init_begin[], __init_end[];
1824 return free_reserved_area(&__init_begin, &__init_end,
1825 poison, "unused kernel");
1828 static inline unsigned long get_num_physpages(void)
1831 unsigned long phys_pages = 0;
1833 for_each_online_node(nid)
1834 phys_pages += node_present_pages(nid);
1839 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1841 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1842 * zones, allocate the backing mem_map and account for memory holes in a more
1843 * architecture independent manner. This is a substitute for creating the
1844 * zone_sizes[] and zholes_size[] arrays and passing them to
1845 * free_area_init_node()
1847 * An architecture is expected to register range of page frames backed by
1848 * physical memory with memblock_add[_node]() before calling
1849 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1850 * usage, an architecture is expected to do something like
1852 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1854 * for_each_valid_physical_page_range()
1855 * memblock_add_node(base, size, nid)
1856 * free_area_init_nodes(max_zone_pfns);
1858 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1859 * registered physical page range. Similarly
1860 * sparse_memory_present_with_active_regions() calls memory_present() for
1861 * each range when SPARSEMEM is enabled.
1863 * See mm/page_alloc.c for more information on each function exposed by
1864 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1866 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1867 unsigned long node_map_pfn_alignment(void);
1868 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1869 unsigned long end_pfn);
1870 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1871 unsigned long end_pfn);
1872 extern void get_pfn_range_for_nid(unsigned int nid,
1873 unsigned long *start_pfn, unsigned long *end_pfn);
1874 extern unsigned long find_min_pfn_with_active_regions(void);
1875 extern void free_bootmem_with_active_regions(int nid,
1876 unsigned long max_low_pfn);
1877 extern void sparse_memory_present_with_active_regions(int nid);
1879 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1881 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1882 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1883 static inline int __early_pfn_to_nid(unsigned long pfn,
1884 struct mminit_pfnnid_cache *state)
1889 /* please see mm/page_alloc.c */
1890 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1891 /* there is a per-arch backend function. */
1892 extern int __meminit __early_pfn_to_nid(unsigned long pfn,
1893 struct mminit_pfnnid_cache *state);
1896 extern void set_dma_reserve(unsigned long new_dma_reserve);
1897 extern void memmap_init_zone(unsigned long, int, unsigned long,
1898 unsigned long, enum memmap_context);
1899 extern void setup_per_zone_wmarks(void);
1900 extern int __meminit init_per_zone_wmark_min(void);
1901 extern void mem_init(void);
1902 extern void __init mmap_init(void);
1903 extern void show_mem(unsigned int flags);
1904 extern long si_mem_available(void);
1905 extern void si_meminfo(struct sysinfo * val);
1906 extern void si_meminfo_node(struct sysinfo *val, int nid);
1907 #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES
1908 extern unsigned long arch_reserved_kernel_pages(void);
1911 extern __printf(2, 3)
1912 void warn_alloc(gfp_t gfp_mask, const char *fmt, ...);
1914 extern void setup_per_cpu_pageset(void);
1916 extern void zone_pcp_update(struct zone *zone);
1917 extern void zone_pcp_reset(struct zone *zone);
1920 extern int min_free_kbytes;
1921 extern int watermark_scale_factor;
1924 extern atomic_long_t mmap_pages_allocated;
1925 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1927 /* interval_tree.c */
1928 void vma_interval_tree_insert(struct vm_area_struct *node,
1929 struct rb_root *root);
1930 void vma_interval_tree_insert_after(struct vm_area_struct *node,
1931 struct vm_area_struct *prev,
1932 struct rb_root *root);
1933 void vma_interval_tree_remove(struct vm_area_struct *node,
1934 struct rb_root *root);
1935 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1936 unsigned long start, unsigned long last);
1937 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1938 unsigned long start, unsigned long last);
1940 #define vma_interval_tree_foreach(vma, root, start, last) \
1941 for (vma = vma_interval_tree_iter_first(root, start, last); \
1942 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1944 void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1945 struct rb_root *root);
1946 void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1947 struct rb_root *root);
1948 struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1949 struct rb_root *root, unsigned long start, unsigned long last);
1950 struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1951 struct anon_vma_chain *node, unsigned long start, unsigned long last);
1952 #ifdef CONFIG_DEBUG_VM_RB
1953 void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1956 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1957 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1958 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1961 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1962 extern int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
1963 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert,
1964 struct vm_area_struct *expand);
1965 static inline int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1966 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert)
1968 return __vma_adjust(vma, start, end, pgoff, insert, NULL);
1970 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1971 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1972 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1973 struct mempolicy *, struct vm_userfaultfd_ctx);
1974 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1975 extern int split_vma(struct mm_struct *,
1976 struct vm_area_struct *, unsigned long addr, int new_below);
1977 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1978 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1979 struct rb_node **, struct rb_node *);
1980 extern void unlink_file_vma(struct vm_area_struct *);
1981 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1982 unsigned long addr, unsigned long len, pgoff_t pgoff,
1983 bool *need_rmap_locks);
1984 extern void exit_mmap(struct mm_struct *);
1986 static inline int check_data_rlimit(unsigned long rlim,
1988 unsigned long start,
1989 unsigned long end_data,
1990 unsigned long start_data)
1992 if (rlim < RLIM_INFINITY) {
1993 if (((new - start) + (end_data - start_data)) > rlim)
2000 extern int mm_take_all_locks(struct mm_struct *mm);
2001 extern void mm_drop_all_locks(struct mm_struct *mm);
2003 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
2004 extern struct file *get_mm_exe_file(struct mm_struct *mm);
2005 extern struct file *get_task_exe_file(struct task_struct *task);
2007 extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages);
2008 extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages);
2010 extern bool vma_is_special_mapping(const struct vm_area_struct *vma,
2011 const struct vm_special_mapping *sm);
2012 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
2013 unsigned long addr, unsigned long len,
2014 unsigned long flags,
2015 const struct vm_special_mapping *spec);
2016 /* This is an obsolete alternative to _install_special_mapping. */
2017 extern int install_special_mapping(struct mm_struct *mm,
2018 unsigned long addr, unsigned long len,
2019 unsigned long flags, struct page **pages);
2021 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
2023 extern unsigned long mmap_region(struct file *file, unsigned long addr,
2024 unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
2025 extern unsigned long do_mmap(struct file *file, unsigned long addr,
2026 unsigned long len, unsigned long prot, unsigned long flags,
2027 vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate);
2028 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
2030 static inline unsigned long
2031 do_mmap_pgoff(struct file *file, unsigned long addr,
2032 unsigned long len, unsigned long prot, unsigned long flags,
2033 unsigned long pgoff, unsigned long *populate)
2035 return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate);
2039 extern int __mm_populate(unsigned long addr, unsigned long len,
2041 static inline void mm_populate(unsigned long addr, unsigned long len)
2044 (void) __mm_populate(addr, len, 1);
2047 static inline void mm_populate(unsigned long addr, unsigned long len) {}
2050 /* These take the mm semaphore themselves */
2051 extern int __must_check vm_brk(unsigned long, unsigned long);
2052 extern int vm_munmap(unsigned long, size_t);
2053 extern unsigned long __must_check vm_mmap(struct file *, unsigned long,
2054 unsigned long, unsigned long,
2055 unsigned long, unsigned long);
2057 struct vm_unmapped_area_info {
2058 #define VM_UNMAPPED_AREA_TOPDOWN 1
2059 unsigned long flags;
2060 unsigned long length;
2061 unsigned long low_limit;
2062 unsigned long high_limit;
2063 unsigned long align_mask;
2064 unsigned long align_offset;
2067 extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
2068 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
2071 * Search for an unmapped address range.
2073 * We are looking for a range that:
2074 * - does not intersect with any VMA;
2075 * - is contained within the [low_limit, high_limit) interval;
2076 * - is at least the desired size.
2077 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
2079 static inline unsigned long
2080 vm_unmapped_area(struct vm_unmapped_area_info *info)
2082 if (info->flags & VM_UNMAPPED_AREA_TOPDOWN)
2083 return unmapped_area_topdown(info);
2085 return unmapped_area(info);
2089 extern void truncate_inode_pages(struct address_space *, loff_t);
2090 extern void truncate_inode_pages_range(struct address_space *,
2091 loff_t lstart, loff_t lend);
2092 extern void truncate_inode_pages_final(struct address_space *);
2094 /* generic vm_area_ops exported for stackable file systems */
2095 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
2096 extern void filemap_map_pages(struct vm_fault *vmf,
2097 pgoff_t start_pgoff, pgoff_t end_pgoff);
2098 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2100 /* mm/page-writeback.c */
2101 int write_one_page(struct page *page, int wait);
2102 void task_dirty_inc(struct task_struct *tsk);
2105 #define VM_MAX_READAHEAD 128 /* kbytes */
2106 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
2108 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
2109 pgoff_t offset, unsigned long nr_to_read);
2111 void page_cache_sync_readahead(struct address_space *mapping,
2112 struct file_ra_state *ra,
2115 unsigned long size);
2117 void page_cache_async_readahead(struct address_space *mapping,
2118 struct file_ra_state *ra,
2122 unsigned long size);
2124 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
2125 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
2127 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
2128 extern int expand_downwards(struct vm_area_struct *vma,
2129 unsigned long address);
2131 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
2133 #define expand_upwards(vma, address) (0)
2136 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
2137 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
2138 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
2139 struct vm_area_struct **pprev);
2141 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
2142 NULL if none. Assume start_addr < end_addr. */
2143 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
2145 struct vm_area_struct * vma = find_vma(mm,start_addr);
2147 if (vma && end_addr <= vma->vm_start)
2152 static inline unsigned long vma_pages(struct vm_area_struct *vma)
2154 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
2157 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2158 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
2159 unsigned long vm_start, unsigned long vm_end)
2161 struct vm_area_struct *vma = find_vma(mm, vm_start);
2163 if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
2170 pgprot_t vm_get_page_prot(unsigned long vm_flags);
2171 void vma_set_page_prot(struct vm_area_struct *vma);
2173 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
2177 static inline void vma_set_page_prot(struct vm_area_struct *vma)
2179 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
2183 #ifdef CONFIG_NUMA_BALANCING
2184 unsigned long change_prot_numa(struct vm_area_struct *vma,
2185 unsigned long start, unsigned long end);
2188 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
2189 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
2190 unsigned long pfn, unsigned long size, pgprot_t);
2191 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
2192 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
2194 int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
2195 unsigned long pfn, pgprot_t pgprot);
2196 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
2198 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
2201 struct page *follow_page_mask(struct vm_area_struct *vma,
2202 unsigned long address, unsigned int foll_flags,
2203 unsigned int *page_mask);
2205 static inline struct page *follow_page(struct vm_area_struct *vma,
2206 unsigned long address, unsigned int foll_flags)
2208 unsigned int unused_page_mask;
2209 return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
2212 #define FOLL_WRITE 0x01 /* check pte is writable */
2213 #define FOLL_TOUCH 0x02 /* mark page accessed */
2214 #define FOLL_GET 0x04 /* do get_page on page */
2215 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2216 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2217 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2218 * and return without waiting upon it */
2219 #define FOLL_POPULATE 0x40 /* fault in page */
2220 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2221 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2222 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2223 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2224 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2225 #define FOLL_MLOCK 0x1000 /* lock present pages */
2226 #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */
2227 #define FOLL_COW 0x4000 /* internal GUP flag */
2229 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
2231 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
2232 unsigned long size, pte_fn_t fn, void *data);
2235 #ifdef CONFIG_PAGE_POISONING
2236 extern bool page_poisoning_enabled(void);
2237 extern void kernel_poison_pages(struct page *page, int numpages, int enable);
2238 extern bool page_is_poisoned(struct page *page);
2240 static inline bool page_poisoning_enabled(void) { return false; }
2241 static inline void kernel_poison_pages(struct page *page, int numpages,
2243 static inline bool page_is_poisoned(struct page *page) { return false; }
2246 #ifdef CONFIG_DEBUG_PAGEALLOC
2247 extern bool _debug_pagealloc_enabled;
2248 extern void __kernel_map_pages(struct page *page, int numpages, int enable);
2250 static inline bool debug_pagealloc_enabled(void)
2252 return _debug_pagealloc_enabled;
2256 kernel_map_pages(struct page *page, int numpages, int enable)
2258 if (!debug_pagealloc_enabled())
2261 __kernel_map_pages(page, numpages, enable);
2263 #ifdef CONFIG_HIBERNATION
2264 extern bool kernel_page_present(struct page *page);
2265 #endif /* CONFIG_HIBERNATION */
2266 #else /* CONFIG_DEBUG_PAGEALLOC */
2268 kernel_map_pages(struct page *page, int numpages, int enable) {}
2269 #ifdef CONFIG_HIBERNATION
2270 static inline bool kernel_page_present(struct page *page) { return true; }
2271 #endif /* CONFIG_HIBERNATION */
2272 static inline bool debug_pagealloc_enabled(void)
2276 #endif /* CONFIG_DEBUG_PAGEALLOC */
2278 #ifdef __HAVE_ARCH_GATE_AREA
2279 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
2280 extern int in_gate_area_no_mm(unsigned long addr);
2281 extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
2283 static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
2287 static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
2288 static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
2292 #endif /* __HAVE_ARCH_GATE_AREA */
2294 extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm);
2296 #ifdef CONFIG_SYSCTL
2297 extern int sysctl_drop_caches;
2298 int drop_caches_sysctl_handler(struct ctl_table *, int,
2299 void __user *, size_t *, loff_t *);
2302 void drop_slab(void);
2303 void drop_slab_node(int nid);
2306 #define randomize_va_space 0
2308 extern int randomize_va_space;
2311 const char * arch_vma_name(struct vm_area_struct *vma);
2312 void print_vma_addr(char *prefix, unsigned long rip);
2314 void sparse_mem_maps_populate_node(struct page **map_map,
2315 unsigned long pnum_begin,
2316 unsigned long pnum_end,
2317 unsigned long map_count,
2320 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
2321 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
2322 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
2323 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
2324 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
2325 void *vmemmap_alloc_block(unsigned long size, int node);
2327 void *__vmemmap_alloc_block_buf(unsigned long size, int node,
2328 struct vmem_altmap *altmap);
2329 static inline void *vmemmap_alloc_block_buf(unsigned long size, int node)
2331 return __vmemmap_alloc_block_buf(size, node, NULL);
2334 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
2335 int vmemmap_populate_basepages(unsigned long start, unsigned long end,
2337 int vmemmap_populate(unsigned long start, unsigned long end, int node);
2338 void vmemmap_populate_print_last(void);
2339 #ifdef CONFIG_MEMORY_HOTPLUG
2340 void vmemmap_free(unsigned long start, unsigned long end);
2342 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
2343 unsigned long size);
2346 MF_COUNT_INCREASED = 1 << 0,
2347 MF_ACTION_REQUIRED = 1 << 1,
2348 MF_MUST_KILL = 1 << 2,
2349 MF_SOFT_OFFLINE = 1 << 3,
2351 extern int memory_failure(unsigned long pfn, int trapno, int flags);
2352 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
2353 extern int unpoison_memory(unsigned long pfn);
2354 extern int get_hwpoison_page(struct page *page);
2355 #define put_hwpoison_page(page) put_page(page)
2356 extern int sysctl_memory_failure_early_kill;
2357 extern int sysctl_memory_failure_recovery;
2358 extern void shake_page(struct page *p, int access);
2359 extern atomic_long_t num_poisoned_pages;
2360 extern int soft_offline_page(struct page *page, int flags);
2364 * Error handlers for various types of pages.
2367 MF_IGNORED, /* Error: cannot be handled */
2368 MF_FAILED, /* Error: handling failed */
2369 MF_DELAYED, /* Will be handled later */
2370 MF_RECOVERED, /* Successfully recovered */
2373 enum mf_action_page_type {
2375 MF_MSG_KERNEL_HIGH_ORDER,
2377 MF_MSG_DIFFERENT_COMPOUND,
2378 MF_MSG_POISONED_HUGE,
2381 MF_MSG_UNMAP_FAILED,
2382 MF_MSG_DIRTY_SWAPCACHE,
2383 MF_MSG_CLEAN_SWAPCACHE,
2384 MF_MSG_DIRTY_MLOCKED_LRU,
2385 MF_MSG_CLEAN_MLOCKED_LRU,
2386 MF_MSG_DIRTY_UNEVICTABLE_LRU,
2387 MF_MSG_CLEAN_UNEVICTABLE_LRU,
2390 MF_MSG_TRUNCATED_LRU,
2396 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2397 extern void clear_huge_page(struct page *page,
2399 unsigned int pages_per_huge_page);
2400 extern void copy_user_huge_page(struct page *dst, struct page *src,
2401 unsigned long addr, struct vm_area_struct *vma,
2402 unsigned int pages_per_huge_page);
2403 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2405 extern struct page_ext_operations debug_guardpage_ops;
2406 extern struct page_ext_operations page_poisoning_ops;
2408 #ifdef CONFIG_DEBUG_PAGEALLOC
2409 extern unsigned int _debug_guardpage_minorder;
2410 extern bool _debug_guardpage_enabled;
2412 static inline unsigned int debug_guardpage_minorder(void)
2414 return _debug_guardpage_minorder;
2417 static inline bool debug_guardpage_enabled(void)
2419 return _debug_guardpage_enabled;
2422 static inline bool page_is_guard(struct page *page)
2424 struct page_ext *page_ext;
2426 if (!debug_guardpage_enabled())
2429 page_ext = lookup_page_ext(page);
2430 if (unlikely(!page_ext))
2433 return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
2436 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2437 static inline bool debug_guardpage_enabled(void) { return false; }
2438 static inline bool page_is_guard(struct page *page) { return false; }
2439 #endif /* CONFIG_DEBUG_PAGEALLOC */
2441 #if MAX_NUMNODES > 1
2442 void __init setup_nr_node_ids(void);
2444 static inline void setup_nr_node_ids(void) {}
2447 #endif /* __KERNEL__ */
2448 #endif /* _LINUX_MM_H */