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 * To prevent common memory management code establishing
77 * a zero page mapping on a read fault.
78 * This macro should be defined within <asm/pgtable.h>.
79 * s390 does this to prevent multiplexing of hardware bits
80 * related to the physical page in case of virtualization.
82 #ifndef mm_forbids_zeropage
83 #define mm_forbids_zeropage(X) (0)
87 * Default maximum number of active map areas, this limits the number of vmas
88 * per mm struct. Users can overwrite this number by sysctl but there is a
91 * When a program's coredump is generated as ELF format, a section is created
92 * per a vma. In ELF, the number of sections is represented in unsigned short.
93 * This means the number of sections should be smaller than 65535 at coredump.
94 * Because the kernel adds some informative sections to a image of program at
95 * generating coredump, we need some margin. The number of extra sections is
96 * 1-3 now and depends on arch. We use "5" as safe margin, here.
98 * ELF extended numbering allows more than 65535 sections, so 16-bit bound is
99 * not a hard limit any more. Although some userspace tools can be surprised by
102 #define MAPCOUNT_ELF_CORE_MARGIN (5)
103 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
105 extern int sysctl_max_map_count;
107 extern unsigned long sysctl_user_reserve_kbytes;
108 extern unsigned long sysctl_admin_reserve_kbytes;
110 extern int sysctl_overcommit_memory;
111 extern int sysctl_overcommit_ratio;
112 extern unsigned long sysctl_overcommit_kbytes;
114 extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *,
116 extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
119 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
121 /* to align the pointer to the (next) page boundary */
122 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
124 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
125 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
128 * Linux kernel virtual memory manager primitives.
129 * The idea being to have a "virtual" mm in the same way
130 * we have a virtual fs - giving a cleaner interface to the
131 * mm details, and allowing different kinds of memory mappings
132 * (from shared memory to executable loading to arbitrary
136 extern struct kmem_cache *vm_area_cachep;
139 extern struct rb_root nommu_region_tree;
140 extern struct rw_semaphore nommu_region_sem;
142 extern unsigned int kobjsize(const void *objp);
146 * vm_flags in vm_area_struct, see mm_types.h.
147 * When changing, update also include/trace/events/mmflags.h
149 #define VM_NONE 0x00000000
151 #define VM_READ 0x00000001 /* currently active flags */
152 #define VM_WRITE 0x00000002
153 #define VM_EXEC 0x00000004
154 #define VM_SHARED 0x00000008
156 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
157 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
158 #define VM_MAYWRITE 0x00000020
159 #define VM_MAYEXEC 0x00000040
160 #define VM_MAYSHARE 0x00000080
162 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
163 #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
164 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
165 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
166 #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
168 #define VM_LOCKED 0x00002000
169 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
171 /* Used by sys_madvise() */
172 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
173 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
175 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
176 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
177 #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
178 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
179 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
180 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
181 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
182 #define VM_ARCH_2 0x02000000
183 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
185 #ifdef CONFIG_MEM_SOFT_DIRTY
186 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
188 # define VM_SOFTDIRTY 0
191 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
192 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
193 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
194 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
196 #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
197 #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */
198 #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */
199 #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */
200 #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */
201 #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0)
202 #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1)
203 #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2)
204 #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3)
205 #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
207 #if defined(CONFIG_X86)
208 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
209 #if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS)
210 # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0
211 # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */
212 # define VM_PKEY_BIT1 VM_HIGH_ARCH_1
213 # define VM_PKEY_BIT2 VM_HIGH_ARCH_2
214 # define VM_PKEY_BIT3 VM_HIGH_ARCH_3
216 #elif defined(CONFIG_PPC)
217 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
218 #elif defined(CONFIG_PARISC)
219 # define VM_GROWSUP VM_ARCH_1
220 #elif defined(CONFIG_METAG)
221 # define VM_GROWSUP VM_ARCH_1
222 #elif defined(CONFIG_IA64)
223 # define VM_GROWSUP VM_ARCH_1
224 #elif !defined(CONFIG_MMU)
225 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
228 #if defined(CONFIG_X86)
229 /* MPX specific bounds table or bounds directory */
230 # define VM_MPX VM_ARCH_2
234 # define VM_GROWSUP VM_NONE
237 /* Bits set in the VMA until the stack is in its final location */
238 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
240 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
241 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
244 #ifdef CONFIG_STACK_GROWSUP
245 #define VM_STACK VM_GROWSUP
247 #define VM_STACK VM_GROWSDOWN
250 #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
253 * Special vmas that are non-mergable, non-mlock()able.
254 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
256 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
258 /* This mask defines which mm->def_flags a process can inherit its parent */
259 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
261 /* This mask is used to clear all the VMA flags used by mlock */
262 #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
265 * mapping from the currently active vm_flags protection bits (the
266 * low four bits) to a page protection mask..
268 extern pgprot_t protection_map[16];
270 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
271 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
272 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
273 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
274 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
275 #define FAULT_FLAG_TRIED 0x20 /* Second try */
276 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
277 #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */
278 #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */
281 * vm_fault is filled by the the pagefault handler and passed to the vma's
282 * ->fault function. The vma's ->fault is responsible for returning a bitmask
283 * of VM_FAULT_xxx flags that give details about how the fault was handled.
285 * MM layer fills up gfp_mask for page allocations but fault handler might
286 * alter it if its implementation requires a different allocation context.
288 * pgoff should be used in favour of virtual_address, if possible.
291 unsigned int flags; /* FAULT_FLAG_xxx flags */
292 gfp_t gfp_mask; /* gfp mask to be used for allocations */
293 pgoff_t pgoff; /* Logical page offset based on vma */
294 void __user *virtual_address; /* Faulting virtual address */
296 struct page *cow_page; /* Handler may choose to COW */
297 struct page *page; /* ->fault handlers should return a
298 * page here, unless VM_FAULT_NOPAGE
299 * is set (which is also implied by
302 /* for ->map_pages() only */
303 pgoff_t max_pgoff; /* map pages for offset from pgoff till
304 * max_pgoff inclusive */
305 pte_t *pte; /* pte entry associated with ->pgoff */
309 * These are the virtual MM functions - opening of an area, closing and
310 * unmapping it (needed to keep files on disk up-to-date etc), pointer
311 * to the functions called when a no-page or a wp-page exception occurs.
313 struct vm_operations_struct {
314 void (*open)(struct vm_area_struct * area);
315 void (*close)(struct vm_area_struct * area);
316 int (*mremap)(struct vm_area_struct * area);
317 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
318 int (*pmd_fault)(struct vm_area_struct *, unsigned long address,
319 pmd_t *, unsigned int flags);
320 void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
322 /* notification that a previously read-only page is about to become
323 * writable, if an error is returned it will cause a SIGBUS */
324 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
326 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
327 int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
329 /* called by access_process_vm when get_user_pages() fails, typically
330 * for use by special VMAs that can switch between memory and hardware
332 int (*access)(struct vm_area_struct *vma, unsigned long addr,
333 void *buf, int len, int write);
335 /* Called by the /proc/PID/maps code to ask the vma whether it
336 * has a special name. Returning non-NULL will also cause this
337 * vma to be dumped unconditionally. */
338 const char *(*name)(struct vm_area_struct *vma);
342 * set_policy() op must add a reference to any non-NULL @new mempolicy
343 * to hold the policy upon return. Caller should pass NULL @new to
344 * remove a policy and fall back to surrounding context--i.e. do not
345 * install a MPOL_DEFAULT policy, nor the task or system default
348 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
351 * get_policy() op must add reference [mpol_get()] to any policy at
352 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
353 * in mm/mempolicy.c will do this automatically.
354 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
355 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
356 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
357 * must return NULL--i.e., do not "fallback" to task or system default
360 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
364 * Called by vm_normal_page() for special PTEs to find the
365 * page for @addr. This is useful if the default behavior
366 * (using pte_page()) would not find the correct page.
368 struct page *(*find_special_page)(struct vm_area_struct *vma,
375 #define page_private(page) ((page)->private)
376 #define set_page_private(page, v) ((page)->private = (v))
378 #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
379 static inline int pmd_devmap(pmd_t pmd)
386 * FIXME: take this include out, include page-flags.h in
387 * files which need it (119 of them)
389 #include <linux/page-flags.h>
390 #include <linux/huge_mm.h>
393 * Methods to modify the page usage count.
395 * What counts for a page usage:
396 * - cache mapping (page->mapping)
397 * - private data (page->private)
398 * - page mapped in a task's page tables, each mapping
399 * is counted separately
401 * Also, many kernel routines increase the page count before a critical
402 * routine so they can be sure the page doesn't go away from under them.
406 * Drop a ref, return true if the refcount fell to zero (the page has no users)
408 static inline int put_page_testzero(struct page *page)
410 VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);
411 return page_ref_dec_and_test(page);
415 * Try to grab a ref unless the page has a refcount of zero, return false if
417 * This can be called when MMU is off so it must not access
418 * any of the virtual mappings.
420 static inline int get_page_unless_zero(struct page *page)
422 return page_ref_add_unless(page, 1, 0);
425 extern int page_is_ram(unsigned long pfn);
433 int region_intersects(resource_size_t offset, size_t size, unsigned long flags,
436 /* Support for virtually mapped pages */
437 struct page *vmalloc_to_page(const void *addr);
438 unsigned long vmalloc_to_pfn(const void *addr);
441 * Determine if an address is within the vmalloc range
443 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
444 * is no special casing required.
446 static inline int is_vmalloc_addr(const void *x)
449 unsigned long addr = (unsigned long)x;
451 return addr >= VMALLOC_START && addr < VMALLOC_END;
457 extern int is_vmalloc_or_module_addr(const void *x);
459 static inline int is_vmalloc_or_module_addr(const void *x)
465 extern void kvfree(const void *addr);
467 static inline atomic_t *compound_mapcount_ptr(struct page *page)
469 return &page[1].compound_mapcount;
472 static inline int compound_mapcount(struct page *page)
474 if (!PageCompound(page))
476 page = compound_head(page);
477 return atomic_read(compound_mapcount_ptr(page)) + 1;
481 * The atomic page->_mapcount, starts from -1: so that transitions
482 * both from it and to it can be tracked, using atomic_inc_and_test
483 * and atomic_add_negative(-1).
485 static inline void page_mapcount_reset(struct page *page)
487 atomic_set(&(page)->_mapcount, -1);
490 int __page_mapcount(struct page *page);
492 static inline int page_mapcount(struct page *page)
494 VM_BUG_ON_PAGE(PageSlab(page), page);
496 if (unlikely(PageCompound(page)))
497 return __page_mapcount(page);
498 return atomic_read(&page->_mapcount) + 1;
501 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
502 int total_mapcount(struct page *page);
504 static inline int total_mapcount(struct page *page)
506 return page_mapcount(page);
510 static inline struct page *virt_to_head_page(const void *x)
512 struct page *page = virt_to_page(x);
514 return compound_head(page);
517 void __put_page(struct page *page);
519 void put_pages_list(struct list_head *pages);
521 void split_page(struct page *page, unsigned int order);
522 int split_free_page(struct page *page);
525 * Compound pages have a destructor function. Provide a
526 * prototype for that function and accessor functions.
527 * These are _only_ valid on the head of a compound page.
529 typedef void compound_page_dtor(struct page *);
531 /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
532 enum compound_dtor_id {
535 #ifdef CONFIG_HUGETLB_PAGE
538 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
543 extern compound_page_dtor * const compound_page_dtors[];
545 static inline void set_compound_page_dtor(struct page *page,
546 enum compound_dtor_id compound_dtor)
548 VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page);
549 page[1].compound_dtor = compound_dtor;
552 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
554 VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page);
555 return compound_page_dtors[page[1].compound_dtor];
558 static inline unsigned int compound_order(struct page *page)
562 return page[1].compound_order;
565 static inline void set_compound_order(struct page *page, unsigned int order)
567 page[1].compound_order = order;
570 void free_compound_page(struct page *page);
574 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
575 * servicing faults for write access. In the normal case, do always want
576 * pte_mkwrite. But get_user_pages can cause write faults for mappings
577 * that do not have writing enabled, when used by access_process_vm.
579 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
581 if (likely(vma->vm_flags & VM_WRITE))
582 pte = pte_mkwrite(pte);
586 void do_set_pte(struct vm_area_struct *vma, unsigned long address,
587 struct page *page, pte_t *pte, bool write, bool anon);
591 * Multiple processes may "see" the same page. E.g. for untouched
592 * mappings of /dev/null, all processes see the same page full of
593 * zeroes, and text pages of executables and shared libraries have
594 * only one copy in memory, at most, normally.
596 * For the non-reserved pages, page_count(page) denotes a reference count.
597 * page_count() == 0 means the page is free. page->lru is then used for
598 * freelist management in the buddy allocator.
599 * page_count() > 0 means the page has been allocated.
601 * Pages are allocated by the slab allocator in order to provide memory
602 * to kmalloc and kmem_cache_alloc. In this case, the management of the
603 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
604 * unless a particular usage is carefully commented. (the responsibility of
605 * freeing the kmalloc memory is the caller's, of course).
607 * A page may be used by anyone else who does a __get_free_page().
608 * In this case, page_count still tracks the references, and should only
609 * be used through the normal accessor functions. The top bits of page->flags
610 * and page->virtual store page management information, but all other fields
611 * are unused and could be used privately, carefully. The management of this
612 * page is the responsibility of the one who allocated it, and those who have
613 * subsequently been given references to it.
615 * The other pages (we may call them "pagecache pages") are completely
616 * managed by the Linux memory manager: I/O, buffers, swapping etc.
617 * The following discussion applies only to them.
619 * A pagecache page contains an opaque `private' member, which belongs to the
620 * page's address_space. Usually, this is the address of a circular list of
621 * the page's disk buffers. PG_private must be set to tell the VM to call
622 * into the filesystem to release these pages.
624 * A page may belong to an inode's memory mapping. In this case, page->mapping
625 * is the pointer to the inode, and page->index is the file offset of the page,
626 * in units of PAGE_CACHE_SIZE.
628 * If pagecache pages are not associated with an inode, they are said to be
629 * anonymous pages. These may become associated with the swapcache, and in that
630 * case PG_swapcache is set, and page->private is an offset into the swapcache.
632 * In either case (swapcache or inode backed), the pagecache itself holds one
633 * reference to the page. Setting PG_private should also increment the
634 * refcount. The each user mapping also has a reference to the page.
636 * The pagecache pages are stored in a per-mapping radix tree, which is
637 * rooted at mapping->page_tree, and indexed by offset.
638 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
639 * lists, we instead now tag pages as dirty/writeback in the radix tree.
641 * All pagecache pages may be subject to I/O:
642 * - inode pages may need to be read from disk,
643 * - inode pages which have been modified and are MAP_SHARED may need
644 * to be written back to the inode on disk,
645 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
646 * modified may need to be swapped out to swap space and (later) to be read
651 * The zone field is never updated after free_area_init_core()
652 * sets it, so none of the operations on it need to be atomic.
655 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
656 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
657 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
658 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
659 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
662 * Define the bit shifts to access each section. For non-existent
663 * sections we define the shift as 0; that plus a 0 mask ensures
664 * the compiler will optimise away reference to them.
666 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
667 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
668 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
669 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
671 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
672 #ifdef NODE_NOT_IN_PAGE_FLAGS
673 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
674 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
675 SECTIONS_PGOFF : ZONES_PGOFF)
677 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
678 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
679 NODES_PGOFF : ZONES_PGOFF)
682 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
684 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
685 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
688 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
689 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
690 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
691 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
692 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
694 static inline enum zone_type page_zonenum(const struct page *page)
696 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
699 #ifdef CONFIG_ZONE_DEVICE
700 void get_zone_device_page(struct page *page);
701 void put_zone_device_page(struct page *page);
702 static inline bool is_zone_device_page(const struct page *page)
704 return page_zonenum(page) == ZONE_DEVICE;
707 static inline void get_zone_device_page(struct page *page)
710 static inline void put_zone_device_page(struct page *page)
713 static inline bool is_zone_device_page(const struct page *page)
719 static inline void get_page(struct page *page)
721 page = compound_head(page);
723 * Getting a normal page or the head of a compound page
724 * requires to already have an elevated page->_count.
726 VM_BUG_ON_PAGE(page_ref_count(page) <= 0, page);
729 if (unlikely(is_zone_device_page(page)))
730 get_zone_device_page(page);
733 static inline void put_page(struct page *page)
735 page = compound_head(page);
737 if (put_page_testzero(page))
740 if (unlikely(is_zone_device_page(page)))
741 put_zone_device_page(page);
744 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
745 #define SECTION_IN_PAGE_FLAGS
749 * The identification function is mainly used by the buddy allocator for
750 * determining if two pages could be buddies. We are not really identifying
751 * the zone since we could be using the section number id if we do not have
752 * node id available in page flags.
753 * We only guarantee that it will return the same value for two combinable
756 static inline int page_zone_id(struct page *page)
758 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
761 static inline int zone_to_nid(struct zone *zone)
770 #ifdef NODE_NOT_IN_PAGE_FLAGS
771 extern int page_to_nid(const struct page *page);
773 static inline int page_to_nid(const struct page *page)
775 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
779 #ifdef CONFIG_NUMA_BALANCING
780 static inline int cpu_pid_to_cpupid(int cpu, int pid)
782 return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
785 static inline int cpupid_to_pid(int cpupid)
787 return cpupid & LAST__PID_MASK;
790 static inline int cpupid_to_cpu(int cpupid)
792 return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
795 static inline int cpupid_to_nid(int cpupid)
797 return cpu_to_node(cpupid_to_cpu(cpupid));
800 static inline bool cpupid_pid_unset(int cpupid)
802 return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
805 static inline bool cpupid_cpu_unset(int cpupid)
807 return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
810 static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
812 return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
815 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
816 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
817 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
819 return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
822 static inline int page_cpupid_last(struct page *page)
824 return page->_last_cpupid;
826 static inline void page_cpupid_reset_last(struct page *page)
828 page->_last_cpupid = -1 & LAST_CPUPID_MASK;
831 static inline int page_cpupid_last(struct page *page)
833 return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
836 extern int page_cpupid_xchg_last(struct page *page, int cpupid);
838 static inline void page_cpupid_reset_last(struct page *page)
840 int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
842 page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
843 page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
845 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
846 #else /* !CONFIG_NUMA_BALANCING */
847 static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
849 return page_to_nid(page); /* XXX */
852 static inline int page_cpupid_last(struct page *page)
854 return page_to_nid(page); /* XXX */
857 static inline int cpupid_to_nid(int cpupid)
862 static inline int cpupid_to_pid(int cpupid)
867 static inline int cpupid_to_cpu(int cpupid)
872 static inline int cpu_pid_to_cpupid(int nid, int pid)
877 static inline bool cpupid_pid_unset(int cpupid)
882 static inline void page_cpupid_reset_last(struct page *page)
886 static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
890 #endif /* CONFIG_NUMA_BALANCING */
892 static inline struct zone *page_zone(const struct page *page)
894 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
897 #ifdef SECTION_IN_PAGE_FLAGS
898 static inline void set_page_section(struct page *page, unsigned long section)
900 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
901 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
904 static inline unsigned long page_to_section(const struct page *page)
906 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
910 static inline void set_page_zone(struct page *page, enum zone_type zone)
912 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
913 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
916 static inline void set_page_node(struct page *page, unsigned long node)
918 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
919 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
922 static inline void set_page_links(struct page *page, enum zone_type zone,
923 unsigned long node, unsigned long pfn)
925 set_page_zone(page, zone);
926 set_page_node(page, node);
927 #ifdef SECTION_IN_PAGE_FLAGS
928 set_page_section(page, pfn_to_section_nr(pfn));
933 static inline struct mem_cgroup *page_memcg(struct page *page)
935 return page->mem_cgroup;
938 static inline struct mem_cgroup *page_memcg(struct page *page)
945 * Some inline functions in vmstat.h depend on page_zone()
947 #include <linux/vmstat.h>
949 static __always_inline void *lowmem_page_address(const struct page *page)
951 return __va(PFN_PHYS(page_to_pfn(page)));
954 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
955 #define HASHED_PAGE_VIRTUAL
958 #if defined(WANT_PAGE_VIRTUAL)
959 static inline void *page_address(const struct page *page)
961 return page->virtual;
963 static inline void set_page_address(struct page *page, void *address)
965 page->virtual = address;
967 #define page_address_init() do { } while(0)
970 #if defined(HASHED_PAGE_VIRTUAL)
971 void *page_address(const struct page *page);
972 void set_page_address(struct page *page, void *virtual);
973 void page_address_init(void);
976 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
977 #define page_address(page) lowmem_page_address(page)
978 #define set_page_address(page, address) do { } while(0)
979 #define page_address_init() do { } while(0)
982 extern void *page_rmapping(struct page *page);
983 extern struct anon_vma *page_anon_vma(struct page *page);
984 extern struct address_space *page_mapping(struct page *page);
986 extern struct address_space *__page_file_mapping(struct page *);
989 struct address_space *page_file_mapping(struct page *page)
991 if (unlikely(PageSwapCache(page)))
992 return __page_file_mapping(page);
994 return page->mapping;
998 * Return the pagecache index of the passed page. Regular pagecache pages
999 * use ->index whereas swapcache pages use ->private
1001 static inline pgoff_t page_index(struct page *page)
1003 if (unlikely(PageSwapCache(page)))
1004 return page_private(page);
1008 extern pgoff_t __page_file_index(struct page *page);
1011 * Return the file index of the page. Regular pagecache pages use ->index
1012 * whereas swapcache pages use swp_offset(->private)
1014 static inline pgoff_t page_file_index(struct page *page)
1016 if (unlikely(PageSwapCache(page)))
1017 return __page_file_index(page);
1023 * Return true if this page is mapped into pagetables.
1024 * For compound page it returns true if any subpage of compound page is mapped.
1026 static inline bool page_mapped(struct page *page)
1029 if (likely(!PageCompound(page)))
1030 return atomic_read(&page->_mapcount) >= 0;
1031 page = compound_head(page);
1032 if (atomic_read(compound_mapcount_ptr(page)) >= 0)
1034 for (i = 0; i < hpage_nr_pages(page); i++) {
1035 if (atomic_read(&page[i]._mapcount) >= 0)
1042 * Return true only if the page has been allocated with
1043 * ALLOC_NO_WATERMARKS and the low watermark was not
1044 * met implying that the system is under some pressure.
1046 static inline bool page_is_pfmemalloc(struct page *page)
1049 * Page index cannot be this large so this must be
1050 * a pfmemalloc page.
1052 return page->index == -1UL;
1056 * Only to be called by the page allocator on a freshly allocated
1059 static inline void set_page_pfmemalloc(struct page *page)
1064 static inline void clear_page_pfmemalloc(struct page *page)
1070 * Different kinds of faults, as returned by handle_mm_fault().
1071 * Used to decide whether a process gets delivered SIGBUS or
1072 * just gets major/minor fault counters bumped up.
1075 #define VM_FAULT_OOM 0x0001
1076 #define VM_FAULT_SIGBUS 0x0002
1077 #define VM_FAULT_MAJOR 0x0004
1078 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1079 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1080 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1081 #define VM_FAULT_SIGSEGV 0x0040
1083 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1084 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1085 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1086 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1088 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1090 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1091 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1094 /* Encode hstate index for a hwpoisoned large page */
1095 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1096 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1099 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1101 extern void pagefault_out_of_memory(void);
1103 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1106 * Flags passed to show_mem() and show_free_areas() to suppress output in
1109 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1111 extern void show_free_areas(unsigned int flags);
1112 extern bool skip_free_areas_node(unsigned int flags, int nid);
1114 int shmem_zero_setup(struct vm_area_struct *);
1116 bool shmem_mapping(struct address_space *mapping);
1118 static inline bool shmem_mapping(struct address_space *mapping)
1124 extern bool can_do_mlock(void);
1125 extern int user_shm_lock(size_t, struct user_struct *);
1126 extern void user_shm_unlock(size_t, struct user_struct *);
1129 * Parameter block passed down to zap_pte_range in exceptional cases.
1131 struct zap_details {
1132 struct address_space *check_mapping; /* Check page->mapping if set */
1133 pgoff_t first_index; /* Lowest page->index to unmap */
1134 pgoff_t last_index; /* Highest page->index to unmap */
1137 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
1140 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1141 unsigned long size);
1142 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
1143 unsigned long size, struct zap_details *);
1144 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
1145 unsigned long start, unsigned long end);
1148 * mm_walk - callbacks for walk_page_range
1149 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1150 * this handler is required to be able to handle
1151 * pmd_trans_huge() pmds. They may simply choose to
1152 * split_huge_page() instead of handling it explicitly.
1153 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1154 * @pte_hole: if set, called for each hole at all levels
1155 * @hugetlb_entry: if set, called for each hugetlb entry
1156 * @test_walk: caller specific callback function to determine whether
1157 * we walk over the current vma or not. A positive returned
1158 * value means "do page table walk over the current vma,"
1159 * and a negative one means "abort current page table walk
1160 * right now." 0 means "skip the current vma."
1161 * @mm: mm_struct representing the target process of page table walk
1162 * @vma: vma currently walked (NULL if walking outside vmas)
1163 * @private: private data for callbacks' usage
1165 * (see the comment on walk_page_range() for more details)
1168 int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1169 unsigned long next, struct mm_walk *walk);
1170 int (*pte_entry)(pte_t *pte, unsigned long addr,
1171 unsigned long next, struct mm_walk *walk);
1172 int (*pte_hole)(unsigned long addr, unsigned long next,
1173 struct mm_walk *walk);
1174 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1175 unsigned long addr, unsigned long next,
1176 struct mm_walk *walk);
1177 int (*test_walk)(unsigned long addr, unsigned long next,
1178 struct mm_walk *walk);
1179 struct mm_struct *mm;
1180 struct vm_area_struct *vma;
1184 int walk_page_range(unsigned long addr, unsigned long end,
1185 struct mm_walk *walk);
1186 int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
1187 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1188 unsigned long end, unsigned long floor, unsigned long ceiling);
1189 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1190 struct vm_area_struct *vma);
1191 void unmap_mapping_range(struct address_space *mapping,
1192 loff_t const holebegin, loff_t const holelen, int even_cows);
1193 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1194 unsigned long *pfn);
1195 int follow_phys(struct vm_area_struct *vma, unsigned long address,
1196 unsigned int flags, unsigned long *prot, resource_size_t *phys);
1197 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1198 void *buf, int len, int write);
1200 static inline void unmap_shared_mapping_range(struct address_space *mapping,
1201 loff_t const holebegin, loff_t const holelen)
1203 unmap_mapping_range(mapping, holebegin, holelen, 0);
1206 extern void truncate_pagecache(struct inode *inode, loff_t new);
1207 extern void truncate_setsize(struct inode *inode, loff_t newsize);
1208 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
1209 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1210 int truncate_inode_page(struct address_space *mapping, struct page *page);
1211 int generic_error_remove_page(struct address_space *mapping, struct page *page);
1212 int invalidate_inode_page(struct page *page);
1215 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
1216 unsigned long address, unsigned int flags);
1217 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1218 unsigned long address, unsigned int fault_flags,
1221 static inline int handle_mm_fault(struct mm_struct *mm,
1222 struct vm_area_struct *vma, unsigned long address,
1225 /* should never happen if there's no MMU */
1227 return VM_FAULT_SIGBUS;
1229 static inline int fixup_user_fault(struct task_struct *tsk,
1230 struct mm_struct *mm, unsigned long address,
1231 unsigned int fault_flags, bool *unlocked)
1233 /* should never happen if there's no MMU */
1239 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
1240 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1241 void *buf, int len, int write);
1243 long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1244 unsigned long start, unsigned long nr_pages,
1245 unsigned int foll_flags, struct page **pages,
1246 struct vm_area_struct **vmas, int *nonblocking);
1247 long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
1248 unsigned long start, unsigned long nr_pages,
1249 int write, int force, struct page **pages,
1250 struct vm_area_struct **vmas);
1251 long get_user_pages6(unsigned long start, unsigned long nr_pages,
1252 int write, int force, struct page **pages,
1253 struct vm_area_struct **vmas);
1254 long get_user_pages_locked6(unsigned long start, unsigned long nr_pages,
1255 int write, int force, struct page **pages, int *locked);
1256 long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
1257 unsigned long start, unsigned long nr_pages,
1258 int write, int force, struct page **pages,
1259 unsigned int gup_flags);
1260 long get_user_pages_unlocked5(unsigned long start, unsigned long nr_pages,
1261 int write, int force, struct page **pages);
1262 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1263 struct page **pages);
1265 /* suppress warnings from use in EXPORT_SYMBOL() */
1266 #ifndef __DISABLE_GUP_DEPRECATED
1267 #define __gup_deprecated __deprecated
1269 #define __gup_deprecated
1272 * These macros provide backward-compatibility with the old
1273 * get_user_pages() variants which took tsk/mm. These
1274 * functions/macros provide both compile-time __deprecated so we
1275 * can catch old-style use and not break the build. The actual
1276 * functions also have WARN_ON()s to let us know at runtime if
1277 * the get_user_pages() should have been the "remote" variant.
1279 * These are hideous, but temporary.
1281 * If you run into one of these __deprecated warnings, look
1282 * at how you are calling get_user_pages(). If you are calling
1283 * it with current/current->mm as the first two arguments,
1284 * simply remove those arguments. The behavior will be the same
1285 * as it is now. If you are calling it on another task, use
1286 * get_user_pages_remote() instead.
1288 * Any questions? Ask Dave Hansen <dave@sr71.net>
1292 get_user_pages8(struct task_struct *tsk, struct mm_struct *mm,
1293 unsigned long start, unsigned long nr_pages,
1294 int write, int force, struct page **pages,
1295 struct vm_area_struct **vmas);
1296 #define GUP_MACRO(_1, _2, _3, _4, _5, _6, _7, _8, get_user_pages, ...) \
1298 #define get_user_pages(...) GUP_MACRO(__VA_ARGS__, \
1299 get_user_pages8, x, \
1300 get_user_pages6, x, x, x, x, x)(__VA_ARGS__)
1303 long get_user_pages_locked8(struct task_struct *tsk, struct mm_struct *mm,
1304 unsigned long start, unsigned long nr_pages,
1305 int write, int force, struct page **pages,
1307 #define GUPL_MACRO(_1, _2, _3, _4, _5, _6, _7, _8, get_user_pages_locked, ...) \
1308 get_user_pages_locked
1309 #define get_user_pages_locked(...) GUPL_MACRO(__VA_ARGS__, \
1310 get_user_pages_locked8, x, \
1311 get_user_pages_locked6, x, x, x, x)(__VA_ARGS__)
1314 long get_user_pages_unlocked7(struct task_struct *tsk, struct mm_struct *mm,
1315 unsigned long start, unsigned long nr_pages,
1316 int write, int force, struct page **pages);
1317 #define GUPU_MACRO(_1, _2, _3, _4, _5, _6, _7, get_user_pages_unlocked, ...) \
1318 get_user_pages_unlocked
1319 #define get_user_pages_unlocked(...) GUPU_MACRO(__VA_ARGS__, \
1320 get_user_pages_unlocked7, x, \
1321 get_user_pages_unlocked5, x, x, x, x)(__VA_ARGS__)
1323 /* Container for pinned pfns / pages */
1324 struct frame_vector {
1325 unsigned int nr_allocated; /* Number of frames we have space for */
1326 unsigned int nr_frames; /* Number of frames stored in ptrs array */
1327 bool got_ref; /* Did we pin pages by getting page ref? */
1328 bool is_pfns; /* Does array contain pages or pfns? */
1329 void *ptrs[0]; /* Array of pinned pfns / pages. Use
1330 * pfns_vector_pages() or pfns_vector_pfns()
1334 struct frame_vector *frame_vector_create(unsigned int nr_frames);
1335 void frame_vector_destroy(struct frame_vector *vec);
1336 int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
1337 bool write, bool force, struct frame_vector *vec);
1338 void put_vaddr_frames(struct frame_vector *vec);
1339 int frame_vector_to_pages(struct frame_vector *vec);
1340 void frame_vector_to_pfns(struct frame_vector *vec);
1342 static inline unsigned int frame_vector_count(struct frame_vector *vec)
1344 return vec->nr_frames;
1347 static inline struct page **frame_vector_pages(struct frame_vector *vec)
1350 int err = frame_vector_to_pages(vec);
1353 return ERR_PTR(err);
1355 return (struct page **)(vec->ptrs);
1358 static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
1361 frame_vector_to_pfns(vec);
1362 return (unsigned long *)(vec->ptrs);
1366 int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1367 struct page **pages);
1368 int get_kernel_page(unsigned long start, int write, struct page **pages);
1369 struct page *get_dump_page(unsigned long addr);
1371 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1372 extern void do_invalidatepage(struct page *page, unsigned int offset,
1373 unsigned int length);
1375 int __set_page_dirty_nobuffers(struct page *page);
1376 int __set_page_dirty_no_writeback(struct page *page);
1377 int redirty_page_for_writepage(struct writeback_control *wbc,
1379 void account_page_dirtied(struct page *page, struct address_space *mapping);
1380 void account_page_cleaned(struct page *page, struct address_space *mapping,
1381 struct bdi_writeback *wb);
1382 int set_page_dirty(struct page *page);
1383 int set_page_dirty_lock(struct page *page);
1384 void cancel_dirty_page(struct page *page);
1385 int clear_page_dirty_for_io(struct page *page);
1387 int get_cmdline(struct task_struct *task, char *buffer, int buflen);
1389 /* Is the vma a continuation of the stack vma above it? */
1390 static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1392 return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
1395 static inline bool vma_is_anonymous(struct vm_area_struct *vma)
1397 return !vma->vm_ops;
1400 static inline int stack_guard_page_start(struct vm_area_struct *vma,
1403 return (vma->vm_flags & VM_GROWSDOWN) &&
1404 (vma->vm_start == addr) &&
1405 !vma_growsdown(vma->vm_prev, addr);
1408 /* Is the vma a continuation of the stack vma below it? */
1409 static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
1411 return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
1414 static inline int stack_guard_page_end(struct vm_area_struct *vma,
1417 return (vma->vm_flags & VM_GROWSUP) &&
1418 (vma->vm_end == addr) &&
1419 !vma_growsup(vma->vm_next, addr);
1422 int vma_is_stack_for_task(struct vm_area_struct *vma, struct task_struct *t);
1424 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1425 unsigned long old_addr, struct vm_area_struct *new_vma,
1426 unsigned long new_addr, unsigned long len,
1427 bool need_rmap_locks);
1428 extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1429 unsigned long end, pgprot_t newprot,
1430 int dirty_accountable, int prot_numa);
1431 extern int mprotect_fixup(struct vm_area_struct *vma,
1432 struct vm_area_struct **pprev, unsigned long start,
1433 unsigned long end, unsigned long newflags);
1436 * doesn't attempt to fault and will return short.
1438 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1439 struct page **pages);
1441 * per-process(per-mm_struct) statistics.
1443 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1445 long val = atomic_long_read(&mm->rss_stat.count[member]);
1447 #ifdef SPLIT_RSS_COUNTING
1449 * counter is updated in asynchronous manner and may go to minus.
1450 * But it's never be expected number for users.
1455 return (unsigned long)val;
1458 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1460 atomic_long_add(value, &mm->rss_stat.count[member]);
1463 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1465 atomic_long_inc(&mm->rss_stat.count[member]);
1468 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1470 atomic_long_dec(&mm->rss_stat.count[member]);
1473 /* Optimized variant when page is already known not to be PageAnon */
1474 static inline int mm_counter_file(struct page *page)
1476 if (PageSwapBacked(page))
1477 return MM_SHMEMPAGES;
1478 return MM_FILEPAGES;
1481 static inline int mm_counter(struct page *page)
1484 return MM_ANONPAGES;
1485 return mm_counter_file(page);
1488 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1490 return get_mm_counter(mm, MM_FILEPAGES) +
1491 get_mm_counter(mm, MM_ANONPAGES) +
1492 get_mm_counter(mm, MM_SHMEMPAGES);
1495 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1497 return max(mm->hiwater_rss, get_mm_rss(mm));
1500 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1502 return max(mm->hiwater_vm, mm->total_vm);
1505 static inline void update_hiwater_rss(struct mm_struct *mm)
1507 unsigned long _rss = get_mm_rss(mm);
1509 if ((mm)->hiwater_rss < _rss)
1510 (mm)->hiwater_rss = _rss;
1513 static inline void update_hiwater_vm(struct mm_struct *mm)
1515 if (mm->hiwater_vm < mm->total_vm)
1516 mm->hiwater_vm = mm->total_vm;
1519 static inline void reset_mm_hiwater_rss(struct mm_struct *mm)
1521 mm->hiwater_rss = get_mm_rss(mm);
1524 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1525 struct mm_struct *mm)
1527 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1529 if (*maxrss < hiwater_rss)
1530 *maxrss = hiwater_rss;
1533 #if defined(SPLIT_RSS_COUNTING)
1534 void sync_mm_rss(struct mm_struct *mm);
1536 static inline void sync_mm_rss(struct mm_struct *mm)
1541 #ifndef __HAVE_ARCH_PTE_DEVMAP
1542 static inline int pte_devmap(pte_t pte)
1548 int vma_wants_writenotify(struct vm_area_struct *vma);
1550 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1552 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1556 __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1560 #ifdef __PAGETABLE_PUD_FOLDED
1561 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1562 unsigned long address)
1567 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1570 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1571 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1572 unsigned long address)
1577 static inline void mm_nr_pmds_init(struct mm_struct *mm) {}
1579 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1584 static inline void mm_inc_nr_pmds(struct mm_struct *mm) {}
1585 static inline void mm_dec_nr_pmds(struct mm_struct *mm) {}
1588 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1590 static inline void mm_nr_pmds_init(struct mm_struct *mm)
1592 atomic_long_set(&mm->nr_pmds, 0);
1595 static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
1597 return atomic_long_read(&mm->nr_pmds);
1600 static inline void mm_inc_nr_pmds(struct mm_struct *mm)
1602 atomic_long_inc(&mm->nr_pmds);
1605 static inline void mm_dec_nr_pmds(struct mm_struct *mm)
1607 atomic_long_dec(&mm->nr_pmds);
1611 int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
1612 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1615 * The following ifdef needed to get the 4level-fixup.h header to work.
1616 * Remove it when 4level-fixup.h has been removed.
1618 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1619 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1621 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1622 NULL: pud_offset(pgd, address);
1625 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1627 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1628 NULL: pmd_offset(pud, address);
1630 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1632 #if USE_SPLIT_PTE_PTLOCKS
1633 #if ALLOC_SPLIT_PTLOCKS
1634 void __init ptlock_cache_init(void);
1635 extern bool ptlock_alloc(struct page *page);
1636 extern void ptlock_free(struct page *page);
1638 static inline spinlock_t *ptlock_ptr(struct page *page)
1642 #else /* ALLOC_SPLIT_PTLOCKS */
1643 static inline void ptlock_cache_init(void)
1647 static inline bool ptlock_alloc(struct page *page)
1652 static inline void ptlock_free(struct page *page)
1656 static inline spinlock_t *ptlock_ptr(struct page *page)
1660 #endif /* ALLOC_SPLIT_PTLOCKS */
1662 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1664 return ptlock_ptr(pmd_page(*pmd));
1667 static inline bool ptlock_init(struct page *page)
1670 * prep_new_page() initialize page->private (and therefore page->ptl)
1671 * with 0. Make sure nobody took it in use in between.
1673 * It can happen if arch try to use slab for page table allocation:
1674 * slab code uses page->slab_cache, which share storage with page->ptl.
1676 VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
1677 if (!ptlock_alloc(page))
1679 spin_lock_init(ptlock_ptr(page));
1683 /* Reset page->mapping so free_pages_check won't complain. */
1684 static inline void pte_lock_deinit(struct page *page)
1686 page->mapping = NULL;
1690 #else /* !USE_SPLIT_PTE_PTLOCKS */
1692 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1694 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1696 return &mm->page_table_lock;
1698 static inline void ptlock_cache_init(void) {}
1699 static inline bool ptlock_init(struct page *page) { return true; }
1700 static inline void pte_lock_deinit(struct page *page) {}
1701 #endif /* USE_SPLIT_PTE_PTLOCKS */
1703 static inline void pgtable_init(void)
1705 ptlock_cache_init();
1706 pgtable_cache_init();
1709 static inline bool pgtable_page_ctor(struct page *page)
1711 if (!ptlock_init(page))
1713 inc_zone_page_state(page, NR_PAGETABLE);
1717 static inline void pgtable_page_dtor(struct page *page)
1719 pte_lock_deinit(page);
1720 dec_zone_page_state(page, NR_PAGETABLE);
1723 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1725 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1726 pte_t *__pte = pte_offset_map(pmd, address); \
1732 #define pte_unmap_unlock(pte, ptl) do { \
1737 #define pte_alloc(mm, pmd, address) \
1738 (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd, address))
1740 #define pte_alloc_map(mm, pmd, address) \
1741 (pte_alloc(mm, pmd, address) ? NULL : pte_offset_map(pmd, address))
1743 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1744 (pte_alloc(mm, pmd, address) ? \
1745 NULL : pte_offset_map_lock(mm, pmd, address, ptlp))
1747 #define pte_alloc_kernel(pmd, address) \
1748 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1749 NULL: pte_offset_kernel(pmd, address))
1751 #if USE_SPLIT_PMD_PTLOCKS
1753 static struct page *pmd_to_page(pmd_t *pmd)
1755 unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
1756 return virt_to_page((void *)((unsigned long) pmd & mask));
1759 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1761 return ptlock_ptr(pmd_to_page(pmd));
1764 static inline bool pgtable_pmd_page_ctor(struct page *page)
1766 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1767 page->pmd_huge_pte = NULL;
1769 return ptlock_init(page);
1772 static inline void pgtable_pmd_page_dtor(struct page *page)
1774 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1775 VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
1780 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1784 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1786 return &mm->page_table_lock;
1789 static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
1790 static inline void pgtable_pmd_page_dtor(struct page *page) {}
1792 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1796 static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
1798 spinlock_t *ptl = pmd_lockptr(mm, pmd);
1803 extern void free_area_init(unsigned long * zones_size);
1804 extern void free_area_init_node(int nid, unsigned long * zones_size,
1805 unsigned long zone_start_pfn, unsigned long *zholes_size);
1806 extern void free_initmem(void);
1809 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1810 * into the buddy system. The freed pages will be poisoned with pattern
1811 * "poison" if it's within range [0, UCHAR_MAX].
1812 * Return pages freed into the buddy system.
1814 extern unsigned long free_reserved_area(void *start, void *end,
1815 int poison, char *s);
1817 #ifdef CONFIG_HIGHMEM
1819 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1820 * and totalram_pages.
1822 extern void free_highmem_page(struct page *page);
1825 extern void adjust_managed_page_count(struct page *page, long count);
1826 extern void mem_init_print_info(const char *str);
1828 extern void reserve_bootmem_region(unsigned long start, unsigned long end);
1830 /* Free the reserved page into the buddy system, so it gets managed. */
1831 static inline void __free_reserved_page(struct page *page)
1833 ClearPageReserved(page);
1834 init_page_count(page);
1838 static inline void free_reserved_page(struct page *page)
1840 __free_reserved_page(page);
1841 adjust_managed_page_count(page, 1);
1844 static inline void mark_page_reserved(struct page *page)
1846 SetPageReserved(page);
1847 adjust_managed_page_count(page, -1);
1851 * Default method to free all the __init memory into the buddy system.
1852 * The freed pages will be poisoned with pattern "poison" if it's within
1853 * range [0, UCHAR_MAX].
1854 * Return pages freed into the buddy system.
1856 static inline unsigned long free_initmem_default(int poison)
1858 extern char __init_begin[], __init_end[];
1860 return free_reserved_area(&__init_begin, &__init_end,
1861 poison, "unused kernel");
1864 static inline unsigned long get_num_physpages(void)
1867 unsigned long phys_pages = 0;
1869 for_each_online_node(nid)
1870 phys_pages += node_present_pages(nid);
1875 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1877 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1878 * zones, allocate the backing mem_map and account for memory holes in a more
1879 * architecture independent manner. This is a substitute for creating the
1880 * zone_sizes[] and zholes_size[] arrays and passing them to
1881 * free_area_init_node()
1883 * An architecture is expected to register range of page frames backed by
1884 * physical memory with memblock_add[_node]() before calling
1885 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1886 * usage, an architecture is expected to do something like
1888 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1890 * for_each_valid_physical_page_range()
1891 * memblock_add_node(base, size, nid)
1892 * free_area_init_nodes(max_zone_pfns);
1894 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1895 * registered physical page range. Similarly
1896 * sparse_memory_present_with_active_regions() calls memory_present() for
1897 * each range when SPARSEMEM is enabled.
1899 * See mm/page_alloc.c for more information on each function exposed by
1900 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1902 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1903 unsigned long node_map_pfn_alignment(void);
1904 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1905 unsigned long end_pfn);
1906 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1907 unsigned long end_pfn);
1908 extern void get_pfn_range_for_nid(unsigned int nid,
1909 unsigned long *start_pfn, unsigned long *end_pfn);
1910 extern unsigned long find_min_pfn_with_active_regions(void);
1911 extern void free_bootmem_with_active_regions(int nid,
1912 unsigned long max_low_pfn);
1913 extern void sparse_memory_present_with_active_regions(int nid);
1915 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1917 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1918 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1919 static inline int __early_pfn_to_nid(unsigned long pfn,
1920 struct mminit_pfnnid_cache *state)
1925 /* please see mm/page_alloc.c */
1926 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1927 /* there is a per-arch backend function. */
1928 extern int __meminit __early_pfn_to_nid(unsigned long pfn,
1929 struct mminit_pfnnid_cache *state);
1932 extern void set_dma_reserve(unsigned long new_dma_reserve);
1933 extern void memmap_init_zone(unsigned long, int, unsigned long,
1934 unsigned long, enum memmap_context);
1935 extern void setup_per_zone_wmarks(void);
1936 extern int __meminit init_per_zone_wmark_min(void);
1937 extern void mem_init(void);
1938 extern void __init mmap_init(void);
1939 extern void show_mem(unsigned int flags);
1940 extern long si_mem_available(void);
1941 extern void si_meminfo(struct sysinfo * val);
1942 extern void si_meminfo_node(struct sysinfo *val, int nid);
1944 extern __printf(3, 4)
1945 void warn_alloc_failed(gfp_t gfp_mask, unsigned int order,
1946 const char *fmt, ...);
1948 extern void setup_per_cpu_pageset(void);
1950 extern void zone_pcp_update(struct zone *zone);
1951 extern void zone_pcp_reset(struct zone *zone);
1954 extern int min_free_kbytes;
1955 extern int watermark_scale_factor;
1958 extern atomic_long_t mmap_pages_allocated;
1959 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1961 /* interval_tree.c */
1962 void vma_interval_tree_insert(struct vm_area_struct *node,
1963 struct rb_root *root);
1964 void vma_interval_tree_insert_after(struct vm_area_struct *node,
1965 struct vm_area_struct *prev,
1966 struct rb_root *root);
1967 void vma_interval_tree_remove(struct vm_area_struct *node,
1968 struct rb_root *root);
1969 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1970 unsigned long start, unsigned long last);
1971 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1972 unsigned long start, unsigned long last);
1974 #define vma_interval_tree_foreach(vma, root, start, last) \
1975 for (vma = vma_interval_tree_iter_first(root, start, last); \
1976 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1978 void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1979 struct rb_root *root);
1980 void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1981 struct rb_root *root);
1982 struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1983 struct rb_root *root, unsigned long start, unsigned long last);
1984 struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1985 struct anon_vma_chain *node, unsigned long start, unsigned long last);
1986 #ifdef CONFIG_DEBUG_VM_RB
1987 void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1990 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1991 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1992 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1995 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1996 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1997 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1998 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1999 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
2000 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
2001 struct mempolicy *, struct vm_userfaultfd_ctx);
2002 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
2003 extern int split_vma(struct mm_struct *,
2004 struct vm_area_struct *, unsigned long addr, int new_below);
2005 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
2006 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
2007 struct rb_node **, struct rb_node *);
2008 extern void unlink_file_vma(struct vm_area_struct *);
2009 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
2010 unsigned long addr, unsigned long len, pgoff_t pgoff,
2011 bool *need_rmap_locks);
2012 extern void exit_mmap(struct mm_struct *);
2014 static inline int check_data_rlimit(unsigned long rlim,
2016 unsigned long start,
2017 unsigned long end_data,
2018 unsigned long start_data)
2020 if (rlim < RLIM_INFINITY) {
2021 if (((new - start) + (end_data - start_data)) > rlim)
2028 extern int mm_take_all_locks(struct mm_struct *mm);
2029 extern void mm_drop_all_locks(struct mm_struct *mm);
2031 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
2032 extern struct file *get_mm_exe_file(struct mm_struct *mm);
2034 extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages);
2035 extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages);
2037 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
2038 unsigned long addr, unsigned long len,
2039 unsigned long flags,
2040 const struct vm_special_mapping *spec);
2041 /* This is an obsolete alternative to _install_special_mapping. */
2042 extern int install_special_mapping(struct mm_struct *mm,
2043 unsigned long addr, unsigned long len,
2044 unsigned long flags, struct page **pages);
2046 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
2048 extern unsigned long mmap_region(struct file *file, unsigned long addr,
2049 unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
2050 extern unsigned long do_mmap(struct file *file, unsigned long addr,
2051 unsigned long len, unsigned long prot, unsigned long flags,
2052 vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate);
2053 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
2055 static inline unsigned long
2056 do_mmap_pgoff(struct file *file, unsigned long addr,
2057 unsigned long len, unsigned long prot, unsigned long flags,
2058 unsigned long pgoff, unsigned long *populate)
2060 return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate);
2064 extern int __mm_populate(unsigned long addr, unsigned long len,
2066 static inline void mm_populate(unsigned long addr, unsigned long len)
2069 (void) __mm_populate(addr, len, 1);
2072 static inline void mm_populate(unsigned long addr, unsigned long len) {}
2075 /* These take the mm semaphore themselves */
2076 extern unsigned long vm_brk(unsigned long, unsigned long);
2077 extern int vm_munmap(unsigned long, size_t);
2078 extern unsigned long vm_mmap(struct file *, unsigned long,
2079 unsigned long, unsigned long,
2080 unsigned long, unsigned long);
2082 struct vm_unmapped_area_info {
2083 #define VM_UNMAPPED_AREA_TOPDOWN 1
2084 unsigned long flags;
2085 unsigned long length;
2086 unsigned long low_limit;
2087 unsigned long high_limit;
2088 unsigned long align_mask;
2089 unsigned long align_offset;
2092 extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
2093 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
2096 * Search for an unmapped address range.
2098 * We are looking for a range that:
2099 * - does not intersect with any VMA;
2100 * - is contained within the [low_limit, high_limit) interval;
2101 * - is at least the desired size.
2102 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
2104 static inline unsigned long
2105 vm_unmapped_area(struct vm_unmapped_area_info *info)
2107 if (info->flags & VM_UNMAPPED_AREA_TOPDOWN)
2108 return unmapped_area_topdown(info);
2110 return unmapped_area(info);
2114 extern void truncate_inode_pages(struct address_space *, loff_t);
2115 extern void truncate_inode_pages_range(struct address_space *,
2116 loff_t lstart, loff_t lend);
2117 extern void truncate_inode_pages_final(struct address_space *);
2119 /* generic vm_area_ops exported for stackable file systems */
2120 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
2121 extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
2122 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2124 /* mm/page-writeback.c */
2125 int write_one_page(struct page *page, int wait);
2126 void task_dirty_inc(struct task_struct *tsk);
2129 #define VM_MAX_READAHEAD 128 /* kbytes */
2130 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
2132 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
2133 pgoff_t offset, unsigned long nr_to_read);
2135 void page_cache_sync_readahead(struct address_space *mapping,
2136 struct file_ra_state *ra,
2139 unsigned long size);
2141 void page_cache_async_readahead(struct address_space *mapping,
2142 struct file_ra_state *ra,
2146 unsigned long size);
2148 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
2149 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
2151 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
2152 extern int expand_downwards(struct vm_area_struct *vma,
2153 unsigned long address);
2155 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
2157 #define expand_upwards(vma, address) (0)
2160 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
2161 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
2162 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
2163 struct vm_area_struct **pprev);
2165 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
2166 NULL if none. Assume start_addr < end_addr. */
2167 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
2169 struct vm_area_struct * vma = find_vma(mm,start_addr);
2171 if (vma && end_addr <= vma->vm_start)
2176 static inline unsigned long vma_pages(struct vm_area_struct *vma)
2178 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
2181 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2182 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
2183 unsigned long vm_start, unsigned long vm_end)
2185 struct vm_area_struct *vma = find_vma(mm, vm_start);
2187 if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
2194 pgprot_t vm_get_page_prot(unsigned long vm_flags);
2195 void vma_set_page_prot(struct vm_area_struct *vma);
2197 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
2201 static inline void vma_set_page_prot(struct vm_area_struct *vma)
2203 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
2207 #ifdef CONFIG_NUMA_BALANCING
2208 unsigned long change_prot_numa(struct vm_area_struct *vma,
2209 unsigned long start, unsigned long end);
2212 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
2213 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
2214 unsigned long pfn, unsigned long size, pgprot_t);
2215 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
2216 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
2218 int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
2219 unsigned long pfn, pgprot_t pgprot);
2220 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
2222 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
2225 struct page *follow_page_mask(struct vm_area_struct *vma,
2226 unsigned long address, unsigned int foll_flags,
2227 unsigned int *page_mask);
2229 static inline struct page *follow_page(struct vm_area_struct *vma,
2230 unsigned long address, unsigned int foll_flags)
2232 unsigned int unused_page_mask;
2233 return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
2236 #define FOLL_WRITE 0x01 /* check pte is writable */
2237 #define FOLL_TOUCH 0x02 /* mark page accessed */
2238 #define FOLL_GET 0x04 /* do get_page on page */
2239 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2240 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2241 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2242 * and return without waiting upon it */
2243 #define FOLL_POPULATE 0x40 /* fault in page */
2244 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2245 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2246 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2247 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2248 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2249 #define FOLL_MLOCK 0x1000 /* lock present pages */
2250 #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */
2252 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
2254 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
2255 unsigned long size, pte_fn_t fn, void *data);
2258 #ifdef CONFIG_PAGE_POISONING
2259 extern bool page_poisoning_enabled(void);
2260 extern void kernel_poison_pages(struct page *page, int numpages, int enable);
2261 extern bool page_is_poisoned(struct page *page);
2263 static inline bool page_poisoning_enabled(void) { return false; }
2264 static inline void kernel_poison_pages(struct page *page, int numpages,
2266 static inline bool page_is_poisoned(struct page *page) { return false; }
2269 #ifdef CONFIG_DEBUG_PAGEALLOC
2270 extern bool _debug_pagealloc_enabled;
2271 extern void __kernel_map_pages(struct page *page, int numpages, int enable);
2273 static inline bool debug_pagealloc_enabled(void)
2275 return _debug_pagealloc_enabled;
2279 kernel_map_pages(struct page *page, int numpages, int enable)
2281 if (!debug_pagealloc_enabled())
2284 __kernel_map_pages(page, numpages, enable);
2286 #ifdef CONFIG_HIBERNATION
2287 extern bool kernel_page_present(struct page *page);
2288 #endif /* CONFIG_HIBERNATION */
2289 #else /* CONFIG_DEBUG_PAGEALLOC */
2291 kernel_map_pages(struct page *page, int numpages, int enable) {}
2292 #ifdef CONFIG_HIBERNATION
2293 static inline bool kernel_page_present(struct page *page) { return true; }
2294 #endif /* CONFIG_HIBERNATION */
2295 static inline bool debug_pagealloc_enabled(void)
2299 #endif /* CONFIG_DEBUG_PAGEALLOC */
2301 #ifdef __HAVE_ARCH_GATE_AREA
2302 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
2303 extern int in_gate_area_no_mm(unsigned long addr);
2304 extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
2306 static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
2310 static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
2311 static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
2315 #endif /* __HAVE_ARCH_GATE_AREA */
2317 #ifdef CONFIG_SYSCTL
2318 extern int sysctl_drop_caches;
2319 int drop_caches_sysctl_handler(struct ctl_table *, int,
2320 void __user *, size_t *, loff_t *);
2323 void drop_slab(void);
2324 void drop_slab_node(int nid);
2327 #define randomize_va_space 0
2329 extern int randomize_va_space;
2332 const char * arch_vma_name(struct vm_area_struct *vma);
2333 void print_vma_addr(char *prefix, unsigned long rip);
2335 void sparse_mem_maps_populate_node(struct page **map_map,
2336 unsigned long pnum_begin,
2337 unsigned long pnum_end,
2338 unsigned long map_count,
2341 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
2342 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
2343 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
2344 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
2345 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
2346 void *vmemmap_alloc_block(unsigned long size, int node);
2348 void *__vmemmap_alloc_block_buf(unsigned long size, int node,
2349 struct vmem_altmap *altmap);
2350 static inline void *vmemmap_alloc_block_buf(unsigned long size, int node)
2352 return __vmemmap_alloc_block_buf(size, node, NULL);
2355 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
2356 int vmemmap_populate_basepages(unsigned long start, unsigned long end,
2358 int vmemmap_populate(unsigned long start, unsigned long end, int node);
2359 void vmemmap_populate_print_last(void);
2360 #ifdef CONFIG_MEMORY_HOTPLUG
2361 void vmemmap_free(unsigned long start, unsigned long end);
2363 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
2364 unsigned long size);
2367 MF_COUNT_INCREASED = 1 << 0,
2368 MF_ACTION_REQUIRED = 1 << 1,
2369 MF_MUST_KILL = 1 << 2,
2370 MF_SOFT_OFFLINE = 1 << 3,
2372 extern int memory_failure(unsigned long pfn, int trapno, int flags);
2373 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
2374 extern int unpoison_memory(unsigned long pfn);
2375 extern int get_hwpoison_page(struct page *page);
2376 #define put_hwpoison_page(page) put_page(page)
2377 extern int sysctl_memory_failure_early_kill;
2378 extern int sysctl_memory_failure_recovery;
2379 extern void shake_page(struct page *p, int access);
2380 extern atomic_long_t num_poisoned_pages;
2381 extern int soft_offline_page(struct page *page, int flags);
2385 * Error handlers for various types of pages.
2388 MF_IGNORED, /* Error: cannot be handled */
2389 MF_FAILED, /* Error: handling failed */
2390 MF_DELAYED, /* Will be handled later */
2391 MF_RECOVERED, /* Successfully recovered */
2394 enum mf_action_page_type {
2396 MF_MSG_KERNEL_HIGH_ORDER,
2398 MF_MSG_DIFFERENT_COMPOUND,
2399 MF_MSG_POISONED_HUGE,
2402 MF_MSG_UNMAP_FAILED,
2403 MF_MSG_DIRTY_SWAPCACHE,
2404 MF_MSG_CLEAN_SWAPCACHE,
2405 MF_MSG_DIRTY_MLOCKED_LRU,
2406 MF_MSG_CLEAN_MLOCKED_LRU,
2407 MF_MSG_DIRTY_UNEVICTABLE_LRU,
2408 MF_MSG_CLEAN_UNEVICTABLE_LRU,
2411 MF_MSG_TRUNCATED_LRU,
2417 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2418 extern void clear_huge_page(struct page *page,
2420 unsigned int pages_per_huge_page);
2421 extern void copy_user_huge_page(struct page *dst, struct page *src,
2422 unsigned long addr, struct vm_area_struct *vma,
2423 unsigned int pages_per_huge_page);
2424 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2426 extern struct page_ext_operations debug_guardpage_ops;
2427 extern struct page_ext_operations page_poisoning_ops;
2429 #ifdef CONFIG_DEBUG_PAGEALLOC
2430 extern unsigned int _debug_guardpage_minorder;
2431 extern bool _debug_guardpage_enabled;
2433 static inline unsigned int debug_guardpage_minorder(void)
2435 return _debug_guardpage_minorder;
2438 static inline bool debug_guardpage_enabled(void)
2440 return _debug_guardpage_enabled;
2443 static inline bool page_is_guard(struct page *page)
2445 struct page_ext *page_ext;
2447 if (!debug_guardpage_enabled())
2450 page_ext = lookup_page_ext(page);
2451 return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
2454 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2455 static inline bool debug_guardpage_enabled(void) { return false; }
2456 static inline bool page_is_guard(struct page *page) { return false; }
2457 #endif /* CONFIG_DEBUG_PAGEALLOC */
2459 #if MAX_NUMNODES > 1
2460 void __init setup_nr_node_ids(void);
2462 static inline void setup_nr_node_ids(void) {}
2465 #endif /* __KERNEL__ */
2466 #endif /* _LINUX_MM_H */