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>
26 #include <linux/memremap.h>
30 struct anon_vma_chain
;
33 struct writeback_control
;
36 void init_mm_internals(void);
38 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
39 extern unsigned long max_mapnr
;
41 static inline void set_max_mapnr(unsigned long limit
)
46 static inline void set_max_mapnr(unsigned long limit
) { }
49 extern unsigned long totalram_pages
;
50 extern void * high_memory
;
51 extern int page_cluster
;
54 extern int sysctl_legacy_va_layout
;
56 #define sysctl_legacy_va_layout 0
59 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
60 extern const int mmap_rnd_bits_min
;
61 extern const int mmap_rnd_bits_max
;
62 extern int mmap_rnd_bits __read_mostly
;
64 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
65 extern const int mmap_rnd_compat_bits_min
;
66 extern const int mmap_rnd_compat_bits_max
;
67 extern int mmap_rnd_compat_bits __read_mostly
;
71 #include <asm/pgtable.h>
72 #include <asm/processor.h>
75 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
79 #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
83 #define lm_alias(x) __va(__pa_symbol(x))
87 * To prevent common memory management code establishing
88 * a zero page mapping on a read fault.
89 * This macro should be defined within <asm/pgtable.h>.
90 * s390 does this to prevent multiplexing of hardware bits
91 * related to the physical page in case of virtualization.
93 #ifndef mm_forbids_zeropage
94 #define mm_forbids_zeropage(X) (0)
98 * Default maximum number of active map areas, this limits the number of vmas
99 * per mm struct. Users can overwrite this number by sysctl but there is a
102 * When a program's coredump is generated as ELF format, a section is created
103 * per a vma. In ELF, the number of sections is represented in unsigned short.
104 * This means the number of sections should be smaller than 65535 at coredump.
105 * Because the kernel adds some informative sections to a image of program at
106 * generating coredump, we need some margin. The number of extra sections is
107 * 1-3 now and depends on arch. We use "5" as safe margin, here.
109 * ELF extended numbering allows more than 65535 sections, so 16-bit bound is
110 * not a hard limit any more. Although some userspace tools can be surprised by
113 #define MAPCOUNT_ELF_CORE_MARGIN (5)
114 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
116 extern int sysctl_max_map_count
;
118 extern unsigned long sysctl_user_reserve_kbytes
;
119 extern unsigned long sysctl_admin_reserve_kbytes
;
121 extern int sysctl_overcommit_memory
;
122 extern int sysctl_overcommit_ratio
;
123 extern unsigned long sysctl_overcommit_kbytes
;
125 extern int overcommit_ratio_handler(struct ctl_table
*, int, void __user
*,
127 extern int overcommit_kbytes_handler(struct ctl_table
*, int, void __user
*,
130 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
132 /* to align the pointer to the (next) page boundary */
133 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
135 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
136 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE)
139 * Linux kernel virtual memory manager primitives.
140 * The idea being to have a "virtual" mm in the same way
141 * we have a virtual fs - giving a cleaner interface to the
142 * mm details, and allowing different kinds of memory mappings
143 * (from shared memory to executable loading to arbitrary
147 extern struct kmem_cache
*vm_area_cachep
;
150 extern struct rb_root nommu_region_tree
;
151 extern struct rw_semaphore nommu_region_sem
;
153 extern unsigned int kobjsize(const void *objp
);
157 * vm_flags in vm_area_struct, see mm_types.h.
158 * When changing, update also include/trace/events/mmflags.h
160 #define VM_NONE 0x00000000
162 #define VM_READ 0x00000001 /* currently active flags */
163 #define VM_WRITE 0x00000002
164 #define VM_EXEC 0x00000004
165 #define VM_SHARED 0x00000008
167 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
168 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
169 #define VM_MAYWRITE 0x00000020
170 #define VM_MAYEXEC 0x00000040
171 #define VM_MAYSHARE 0x00000080
173 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
174 #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
175 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
176 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
177 #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
179 #define VM_LOCKED 0x00002000
180 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
182 /* Used by sys_madvise() */
183 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
184 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
186 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
187 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
188 #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
189 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
190 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
191 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
192 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
193 #define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */
194 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
196 #ifdef CONFIG_MEM_SOFT_DIRTY
197 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
199 # define VM_SOFTDIRTY 0
202 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
203 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
204 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
205 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
207 #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
208 #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */
209 #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */
210 #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */
211 #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */
212 #define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */
213 #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0)
214 #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1)
215 #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2)
216 #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3)
217 #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4)
218 #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
220 #if defined(CONFIG_X86)
221 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
222 #if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS)
223 # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0
224 # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */
225 # define VM_PKEY_BIT1 VM_HIGH_ARCH_1
226 # define VM_PKEY_BIT2 VM_HIGH_ARCH_2
227 # define VM_PKEY_BIT3 VM_HIGH_ARCH_3
229 #elif defined(CONFIG_PPC)
230 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
231 #elif defined(CONFIG_PARISC)
232 # define VM_GROWSUP VM_ARCH_1
233 #elif defined(CONFIG_METAG)
234 # define VM_GROWSUP VM_ARCH_1
235 #elif defined(CONFIG_IA64)
236 # define VM_GROWSUP VM_ARCH_1
237 #elif !defined(CONFIG_MMU)
238 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
241 #if defined(CONFIG_X86_INTEL_MPX)
242 /* MPX specific bounds table or bounds directory */
243 # define VM_MPX VM_HIGH_ARCH_BIT_4
245 # define VM_MPX VM_NONE
249 # define VM_GROWSUP VM_NONE
252 /* Bits set in the VMA until the stack is in its final location */
253 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
255 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
256 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
259 #ifdef CONFIG_STACK_GROWSUP
260 #define VM_STACK VM_GROWSUP
262 #define VM_STACK VM_GROWSDOWN
265 #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
268 * Special vmas that are non-mergable, non-mlock()able.
269 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
271 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
273 /* This mask defines which mm->def_flags a process can inherit its parent */
274 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
276 /* This mask is used to clear all the VMA flags used by mlock */
277 #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
280 * mapping from the currently active vm_flags protection bits (the
281 * low four bits) to a page protection mask..
283 extern pgprot_t protection_map
[16];
285 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
286 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
287 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
288 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
289 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
290 #define FAULT_FLAG_TRIED 0x20 /* Second try */
291 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
292 #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */
293 #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */
295 #define FAULT_FLAG_TRACE \
296 { FAULT_FLAG_WRITE, "WRITE" }, \
297 { FAULT_FLAG_MKWRITE, "MKWRITE" }, \
298 { FAULT_FLAG_ALLOW_RETRY, "ALLOW_RETRY" }, \
299 { FAULT_FLAG_RETRY_NOWAIT, "RETRY_NOWAIT" }, \
300 { FAULT_FLAG_KILLABLE, "KILLABLE" }, \
301 { FAULT_FLAG_TRIED, "TRIED" }, \
302 { FAULT_FLAG_USER, "USER" }, \
303 { FAULT_FLAG_REMOTE, "REMOTE" }, \
304 { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" }
307 * vm_fault is filled by the the pagefault handler and passed to the vma's
308 * ->fault function. The vma's ->fault is responsible for returning a bitmask
309 * of VM_FAULT_xxx flags that give details about how the fault was handled.
311 * MM layer fills up gfp_mask for page allocations but fault handler might
312 * alter it if its implementation requires a different allocation context.
314 * pgoff should be used in favour of virtual_address, if possible.
317 struct vm_area_struct
*vma
; /* Target VMA */
318 unsigned int flags
; /* FAULT_FLAG_xxx flags */
319 gfp_t gfp_mask
; /* gfp mask to be used for allocations */
320 pgoff_t pgoff
; /* Logical page offset based on vma */
321 unsigned long address
; /* Faulting virtual address */
322 pmd_t
*pmd
; /* Pointer to pmd entry matching
324 pud_t
*pud
; /* Pointer to pud entry matching
327 pte_t orig_pte
; /* Value of PTE at the time of fault */
329 struct page
*cow_page
; /* Page handler may use for COW fault */
330 struct mem_cgroup
*memcg
; /* Cgroup cow_page belongs to */
331 struct page
*page
; /* ->fault handlers should return a
332 * page here, unless VM_FAULT_NOPAGE
333 * is set (which is also implied by
336 /* These three entries are valid only while holding ptl lock */
337 pte_t
*pte
; /* Pointer to pte entry matching
338 * the 'address'. NULL if the page
339 * table hasn't been allocated.
341 spinlock_t
*ptl
; /* Page table lock.
342 * Protects pte page table if 'pte'
343 * is not NULL, otherwise pmd.
345 pgtable_t prealloc_pte
; /* Pre-allocated pte page table.
346 * vm_ops->map_pages() calls
347 * alloc_set_pte() from atomic context.
348 * do_fault_around() pre-allocates
349 * page table to avoid allocation from
354 /* page entry size for vm->huge_fault() */
355 enum page_entry_size
{
362 * These are the virtual MM functions - opening of an area, closing and
363 * unmapping it (needed to keep files on disk up-to-date etc), pointer
364 * to the functions called when a no-page or a wp-page exception occurs.
366 struct vm_operations_struct
{
367 void (*open
)(struct vm_area_struct
* area
);
368 void (*close
)(struct vm_area_struct
* area
);
369 int (*mremap
)(struct vm_area_struct
* area
);
370 int (*fault
)(struct vm_fault
*vmf
);
371 int (*huge_fault
)(struct vm_fault
*vmf
, enum page_entry_size pe_size
);
372 void (*map_pages
)(struct vm_fault
*vmf
,
373 pgoff_t start_pgoff
, pgoff_t end_pgoff
);
375 /* notification that a previously read-only page is about to become
376 * writable, if an error is returned it will cause a SIGBUS */
377 int (*page_mkwrite
)(struct vm_fault
*vmf
);
379 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
380 int (*pfn_mkwrite
)(struct vm_fault
*vmf
);
382 /* called by access_process_vm when get_user_pages() fails, typically
383 * for use by special VMAs that can switch between memory and hardware
385 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
386 void *buf
, int len
, int write
);
388 /* Called by the /proc/PID/maps code to ask the vma whether it
389 * has a special name. Returning non-NULL will also cause this
390 * vma to be dumped unconditionally. */
391 const char *(*name
)(struct vm_area_struct
*vma
);
395 * set_policy() op must add a reference to any non-NULL @new mempolicy
396 * to hold the policy upon return. Caller should pass NULL @new to
397 * remove a policy and fall back to surrounding context--i.e. do not
398 * install a MPOL_DEFAULT policy, nor the task or system default
401 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
404 * get_policy() op must add reference [mpol_get()] to any policy at
405 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
406 * in mm/mempolicy.c will do this automatically.
407 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
408 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
409 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
410 * must return NULL--i.e., do not "fallback" to task or system default
413 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
417 * Called by vm_normal_page() for special PTEs to find the
418 * page for @addr. This is useful if the default behavior
419 * (using pte_page()) would not find the correct page.
421 struct page
*(*find_special_page
)(struct vm_area_struct
*vma
,
428 #define page_private(page) ((page)->private)
429 #define set_page_private(page, v) ((page)->private = (v))
431 #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
432 static inline int pmd_devmap(pmd_t pmd
)
436 static inline int pud_devmap(pud_t pud
)
440 static inline int pgd_devmap(pgd_t pgd
)
447 * FIXME: take this include out, include page-flags.h in
448 * files which need it (119 of them)
450 #include <linux/page-flags.h>
451 #include <linux/huge_mm.h>
454 * Methods to modify the page usage count.
456 * What counts for a page usage:
457 * - cache mapping (page->mapping)
458 * - private data (page->private)
459 * - page mapped in a task's page tables, each mapping
460 * is counted separately
462 * Also, many kernel routines increase the page count before a critical
463 * routine so they can be sure the page doesn't go away from under them.
467 * Drop a ref, return true if the refcount fell to zero (the page has no users)
469 static inline int put_page_testzero(struct page
*page
)
471 VM_BUG_ON_PAGE(page_ref_count(page
) == 0, page
);
472 return page_ref_dec_and_test(page
);
476 * Try to grab a ref unless the page has a refcount of zero, return false if
478 * This can be called when MMU is off so it must not access
479 * any of the virtual mappings.
481 static inline int get_page_unless_zero(struct page
*page
)
483 return page_ref_add_unless(page
, 1, 0);
486 extern int page_is_ram(unsigned long pfn
);
494 int region_intersects(resource_size_t offset
, size_t size
, unsigned long flags
,
497 /* Support for virtually mapped pages */
498 struct page
*vmalloc_to_page(const void *addr
);
499 unsigned long vmalloc_to_pfn(const void *addr
);
502 * Determine if an address is within the vmalloc range
504 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
505 * is no special casing required.
507 static inline bool is_vmalloc_addr(const void *x
)
510 unsigned long addr
= (unsigned long)x
;
512 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
518 extern int is_vmalloc_or_module_addr(const void *x
);
520 static inline int is_vmalloc_or_module_addr(const void *x
)
526 extern void *kvmalloc_node(size_t size
, gfp_t flags
, int node
);
527 static inline void *kvmalloc(size_t size
, gfp_t flags
)
529 return kvmalloc_node(size
, flags
, NUMA_NO_NODE
);
531 static inline void *kvzalloc_node(size_t size
, gfp_t flags
, int node
)
533 return kvmalloc_node(size
, flags
| __GFP_ZERO
, node
);
535 static inline void *kvzalloc(size_t size
, gfp_t flags
)
537 return kvmalloc(size
, flags
| __GFP_ZERO
);
540 static inline void *kvmalloc_array(size_t n
, size_t size
, gfp_t flags
)
542 if (size
!= 0 && n
> SIZE_MAX
/ size
)
545 return kvmalloc(n
* size
, flags
);
548 extern void kvfree(const void *addr
);
550 static inline atomic_t
*compound_mapcount_ptr(struct page
*page
)
552 return &page
[1].compound_mapcount
;
555 static inline int compound_mapcount(struct page
*page
)
557 VM_BUG_ON_PAGE(!PageCompound(page
), page
);
558 page
= compound_head(page
);
559 return atomic_read(compound_mapcount_ptr(page
)) + 1;
563 * The atomic page->_mapcount, starts from -1: so that transitions
564 * both from it and to it can be tracked, using atomic_inc_and_test
565 * and atomic_add_negative(-1).
567 static inline void page_mapcount_reset(struct page
*page
)
569 atomic_set(&(page
)->_mapcount
, -1);
572 int __page_mapcount(struct page
*page
);
574 static inline int page_mapcount(struct page
*page
)
576 VM_BUG_ON_PAGE(PageSlab(page
), page
);
578 if (unlikely(PageCompound(page
)))
579 return __page_mapcount(page
);
580 return atomic_read(&page
->_mapcount
) + 1;
583 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
584 int total_mapcount(struct page
*page
);
585 int page_trans_huge_mapcount(struct page
*page
, int *total_mapcount
);
587 static inline int total_mapcount(struct page
*page
)
589 return page_mapcount(page
);
591 static inline int page_trans_huge_mapcount(struct page
*page
,
594 int mapcount
= page_mapcount(page
);
596 *total_mapcount
= mapcount
;
601 static inline struct page
*virt_to_head_page(const void *x
)
603 struct page
*page
= virt_to_page(x
);
605 return compound_head(page
);
608 void __put_page(struct page
*page
);
610 void put_pages_list(struct list_head
*pages
);
612 void split_page(struct page
*page
, unsigned int order
);
615 * Compound pages have a destructor function. Provide a
616 * prototype for that function and accessor functions.
617 * These are _only_ valid on the head of a compound page.
619 typedef void compound_page_dtor(struct page
*);
621 /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
622 enum compound_dtor_id
{
625 #ifdef CONFIG_HUGETLB_PAGE
628 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
633 extern compound_page_dtor
* const compound_page_dtors
[];
635 static inline void set_compound_page_dtor(struct page
*page
,
636 enum compound_dtor_id compound_dtor
)
638 VM_BUG_ON_PAGE(compound_dtor
>= NR_COMPOUND_DTORS
, page
);
639 page
[1].compound_dtor
= compound_dtor
;
642 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
644 VM_BUG_ON_PAGE(page
[1].compound_dtor
>= NR_COMPOUND_DTORS
, page
);
645 return compound_page_dtors
[page
[1].compound_dtor
];
648 static inline unsigned int compound_order(struct page
*page
)
652 return page
[1].compound_order
;
655 static inline void set_compound_order(struct page
*page
, unsigned int order
)
657 page
[1].compound_order
= order
;
660 void free_compound_page(struct page
*page
);
664 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
665 * servicing faults for write access. In the normal case, do always want
666 * pte_mkwrite. But get_user_pages can cause write faults for mappings
667 * that do not have writing enabled, when used by access_process_vm.
669 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
671 if (likely(vma
->vm_flags
& VM_WRITE
))
672 pte
= pte_mkwrite(pte
);
676 int alloc_set_pte(struct vm_fault
*vmf
, struct mem_cgroup
*memcg
,
678 int finish_fault(struct vm_fault
*vmf
);
679 int finish_mkwrite_fault(struct vm_fault
*vmf
);
683 * Multiple processes may "see" the same page. E.g. for untouched
684 * mappings of /dev/null, all processes see the same page full of
685 * zeroes, and text pages of executables and shared libraries have
686 * only one copy in memory, at most, normally.
688 * For the non-reserved pages, page_count(page) denotes a reference count.
689 * page_count() == 0 means the page is free. page->lru is then used for
690 * freelist management in the buddy allocator.
691 * page_count() > 0 means the page has been allocated.
693 * Pages are allocated by the slab allocator in order to provide memory
694 * to kmalloc and kmem_cache_alloc. In this case, the management of the
695 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
696 * unless a particular usage is carefully commented. (the responsibility of
697 * freeing the kmalloc memory is the caller's, of course).
699 * A page may be used by anyone else who does a __get_free_page().
700 * In this case, page_count still tracks the references, and should only
701 * be used through the normal accessor functions. The top bits of page->flags
702 * and page->virtual store page management information, but all other fields
703 * are unused and could be used privately, carefully. The management of this
704 * page is the responsibility of the one who allocated it, and those who have
705 * subsequently been given references to it.
707 * The other pages (we may call them "pagecache pages") are completely
708 * managed by the Linux memory manager: I/O, buffers, swapping etc.
709 * The following discussion applies only to them.
711 * A pagecache page contains an opaque `private' member, which belongs to the
712 * page's address_space. Usually, this is the address of a circular list of
713 * the page's disk buffers. PG_private must be set to tell the VM to call
714 * into the filesystem to release these pages.
716 * A page may belong to an inode's memory mapping. In this case, page->mapping
717 * is the pointer to the inode, and page->index is the file offset of the page,
718 * in units of PAGE_SIZE.
720 * If pagecache pages are not associated with an inode, they are said to be
721 * anonymous pages. These may become associated with the swapcache, and in that
722 * case PG_swapcache is set, and page->private is an offset into the swapcache.
724 * In either case (swapcache or inode backed), the pagecache itself holds one
725 * reference to the page. Setting PG_private should also increment the
726 * refcount. The each user mapping also has a reference to the page.
728 * The pagecache pages are stored in a per-mapping radix tree, which is
729 * rooted at mapping->page_tree, and indexed by offset.
730 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
731 * lists, we instead now tag pages as dirty/writeback in the radix tree.
733 * All pagecache pages may be subject to I/O:
734 * - inode pages may need to be read from disk,
735 * - inode pages which have been modified and are MAP_SHARED may need
736 * to be written back to the inode on disk,
737 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
738 * modified may need to be swapped out to swap space and (later) to be read
743 * The zone field is never updated after free_area_init_core()
744 * sets it, so none of the operations on it need to be atomic.
747 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
748 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
749 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
750 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
751 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
754 * Define the bit shifts to access each section. For non-existent
755 * sections we define the shift as 0; that plus a 0 mask ensures
756 * the compiler will optimise away reference to them.
758 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
759 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
760 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
761 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
763 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
764 #ifdef NODE_NOT_IN_PAGE_FLAGS
765 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
766 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
767 SECTIONS_PGOFF : ZONES_PGOFF)
769 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
770 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
771 NODES_PGOFF : ZONES_PGOFF)
774 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
776 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
777 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
780 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
781 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
782 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
783 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
784 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
786 static inline enum zone_type
page_zonenum(const struct page
*page
)
788 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
791 #ifdef CONFIG_ZONE_DEVICE
792 static inline bool is_zone_device_page(const struct page
*page
)
794 return page_zonenum(page
) == ZONE_DEVICE
;
797 static inline bool is_zone_device_page(const struct page
*page
)
803 #if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC)
804 void put_zone_device_private_or_public_page(struct page
*page
);
805 DECLARE_STATIC_KEY_FALSE(device_private_key
);
806 #define IS_HMM_ENABLED static_branch_unlikely(&device_private_key)
807 static inline bool is_device_private_page(const struct page
*page
);
808 static inline bool is_device_public_page(const struct page
*page
);
809 #else /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
810 static inline void put_zone_device_private_or_public_page(struct page
*page
)
813 #define IS_HMM_ENABLED 0
814 static inline bool is_device_private_page(const struct page
*page
)
818 static inline bool is_device_public_page(const struct page
*page
)
822 #endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
825 static inline void get_page(struct page
*page
)
827 page
= compound_head(page
);
829 * Getting a normal page or the head of a compound page
830 * requires to already have an elevated page->_refcount.
832 VM_BUG_ON_PAGE(page_ref_count(page
) <= 0, page
);
836 static inline void put_page(struct page
*page
)
838 page
= compound_head(page
);
841 * For private device pages we need to catch refcount transition from
842 * 2 to 1, when refcount reach one it means the private device page is
843 * free and we need to inform the device driver through callback. See
844 * include/linux/memremap.h and HMM for details.
846 if (IS_HMM_ENABLED
&& unlikely(is_device_private_page(page
) ||
847 unlikely(is_device_public_page(page
)))) {
848 put_zone_device_private_or_public_page(page
);
852 if (put_page_testzero(page
))
856 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
857 #define SECTION_IN_PAGE_FLAGS
861 * The identification function is mainly used by the buddy allocator for
862 * determining if two pages could be buddies. We are not really identifying
863 * the zone since we could be using the section number id if we do not have
864 * node id available in page flags.
865 * We only guarantee that it will return the same value for two combinable
868 static inline int page_zone_id(struct page
*page
)
870 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
873 static inline int zone_to_nid(struct zone
*zone
)
882 #ifdef NODE_NOT_IN_PAGE_FLAGS
883 extern int page_to_nid(const struct page
*page
);
885 static inline int page_to_nid(const struct page
*page
)
887 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
891 #ifdef CONFIG_NUMA_BALANCING
892 static inline int cpu_pid_to_cpupid(int cpu
, int pid
)
894 return ((cpu
& LAST__CPU_MASK
) << LAST__PID_SHIFT
) | (pid
& LAST__PID_MASK
);
897 static inline int cpupid_to_pid(int cpupid
)
899 return cpupid
& LAST__PID_MASK
;
902 static inline int cpupid_to_cpu(int cpupid
)
904 return (cpupid
>> LAST__PID_SHIFT
) & LAST__CPU_MASK
;
907 static inline int cpupid_to_nid(int cpupid
)
909 return cpu_to_node(cpupid_to_cpu(cpupid
));
912 static inline bool cpupid_pid_unset(int cpupid
)
914 return cpupid_to_pid(cpupid
) == (-1 & LAST__PID_MASK
);
917 static inline bool cpupid_cpu_unset(int cpupid
)
919 return cpupid_to_cpu(cpupid
) == (-1 & LAST__CPU_MASK
);
922 static inline bool __cpupid_match_pid(pid_t task_pid
, int cpupid
)
924 return (task_pid
& LAST__PID_MASK
) == cpupid_to_pid(cpupid
);
927 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
928 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
929 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
931 return xchg(&page
->_last_cpupid
, cpupid
& LAST_CPUPID_MASK
);
934 static inline int page_cpupid_last(struct page
*page
)
936 return page
->_last_cpupid
;
938 static inline void page_cpupid_reset_last(struct page
*page
)
940 page
->_last_cpupid
= -1 & LAST_CPUPID_MASK
;
943 static inline int page_cpupid_last(struct page
*page
)
945 return (page
->flags
>> LAST_CPUPID_PGSHIFT
) & LAST_CPUPID_MASK
;
948 extern int page_cpupid_xchg_last(struct page
*page
, int cpupid
);
950 static inline void page_cpupid_reset_last(struct page
*page
)
952 page
->flags
|= LAST_CPUPID_MASK
<< LAST_CPUPID_PGSHIFT
;
954 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
955 #else /* !CONFIG_NUMA_BALANCING */
956 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
958 return page_to_nid(page
); /* XXX */
961 static inline int page_cpupid_last(struct page
*page
)
963 return page_to_nid(page
); /* XXX */
966 static inline int cpupid_to_nid(int cpupid
)
971 static inline int cpupid_to_pid(int cpupid
)
976 static inline int cpupid_to_cpu(int cpupid
)
981 static inline int cpu_pid_to_cpupid(int nid
, int pid
)
986 static inline bool cpupid_pid_unset(int cpupid
)
991 static inline void page_cpupid_reset_last(struct page
*page
)
995 static inline bool cpupid_match_pid(struct task_struct
*task
, int cpupid
)
999 #endif /* CONFIG_NUMA_BALANCING */
1001 static inline struct zone
*page_zone(const struct page
*page
)
1003 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
1006 static inline pg_data_t
*page_pgdat(const struct page
*page
)
1008 return NODE_DATA(page_to_nid(page
));
1011 #ifdef SECTION_IN_PAGE_FLAGS
1012 static inline void set_page_section(struct page
*page
, unsigned long section
)
1014 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
1015 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
1018 static inline unsigned long page_to_section(const struct page
*page
)
1020 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
1024 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
1026 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
1027 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
1030 static inline void set_page_node(struct page
*page
, unsigned long node
)
1032 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
1033 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
1036 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
1037 unsigned long node
, unsigned long pfn
)
1039 set_page_zone(page
, zone
);
1040 set_page_node(page
, node
);
1041 #ifdef SECTION_IN_PAGE_FLAGS
1042 set_page_section(page
, pfn_to_section_nr(pfn
));
1047 static inline struct mem_cgroup
*page_memcg(struct page
*page
)
1049 return page
->mem_cgroup
;
1051 static inline struct mem_cgroup
*page_memcg_rcu(struct page
*page
)
1053 WARN_ON_ONCE(!rcu_read_lock_held());
1054 return READ_ONCE(page
->mem_cgroup
);
1057 static inline struct mem_cgroup
*page_memcg(struct page
*page
)
1061 static inline struct mem_cgroup
*page_memcg_rcu(struct page
*page
)
1063 WARN_ON_ONCE(!rcu_read_lock_held());
1069 * Some inline functions in vmstat.h depend on page_zone()
1071 #include <linux/vmstat.h>
1073 static __always_inline
void *lowmem_page_address(const struct page
*page
)
1075 return page_to_virt(page
);
1078 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
1079 #define HASHED_PAGE_VIRTUAL
1082 #if defined(WANT_PAGE_VIRTUAL)
1083 static inline void *page_address(const struct page
*page
)
1085 return page
->virtual;
1087 static inline void set_page_address(struct page
*page
, void *address
)
1089 page
->virtual = address
;
1091 #define page_address_init() do { } while(0)
1094 #if defined(HASHED_PAGE_VIRTUAL)
1095 void *page_address(const struct page
*page
);
1096 void set_page_address(struct page
*page
, void *virtual);
1097 void page_address_init(void);
1100 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
1101 #define page_address(page) lowmem_page_address(page)
1102 #define set_page_address(page, address) do { } while(0)
1103 #define page_address_init() do { } while(0)
1106 extern void *page_rmapping(struct page
*page
);
1107 extern struct anon_vma
*page_anon_vma(struct page
*page
);
1108 extern struct address_space
*page_mapping(struct page
*page
);
1110 extern struct address_space
*__page_file_mapping(struct page
*);
1113 struct address_space
*page_file_mapping(struct page
*page
)
1115 if (unlikely(PageSwapCache(page
)))
1116 return __page_file_mapping(page
);
1118 return page
->mapping
;
1121 extern pgoff_t
__page_file_index(struct page
*page
);
1124 * Return the pagecache index of the passed page. Regular pagecache pages
1125 * use ->index whereas swapcache pages use swp_offset(->private)
1127 static inline pgoff_t
page_index(struct page
*page
)
1129 if (unlikely(PageSwapCache(page
)))
1130 return __page_file_index(page
);
1134 bool page_mapped(struct page
*page
);
1135 struct address_space
*page_mapping(struct page
*page
);
1138 * Return true only if the page has been allocated with
1139 * ALLOC_NO_WATERMARKS and the low watermark was not
1140 * met implying that the system is under some pressure.
1142 static inline bool page_is_pfmemalloc(struct page
*page
)
1145 * Page index cannot be this large so this must be
1146 * a pfmemalloc page.
1148 return page
->index
== -1UL;
1152 * Only to be called by the page allocator on a freshly allocated
1155 static inline void set_page_pfmemalloc(struct page
*page
)
1160 static inline void clear_page_pfmemalloc(struct page
*page
)
1166 * Different kinds of faults, as returned by handle_mm_fault().
1167 * Used to decide whether a process gets delivered SIGBUS or
1168 * just gets major/minor fault counters bumped up.
1171 #define VM_FAULT_OOM 0x0001
1172 #define VM_FAULT_SIGBUS 0x0002
1173 #define VM_FAULT_MAJOR 0x0004
1174 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1175 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1176 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1177 #define VM_FAULT_SIGSEGV 0x0040
1179 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1180 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1181 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1182 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1183 #define VM_FAULT_DONE_COW 0x1000 /* ->fault has fully handled COW */
1185 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1187 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1188 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1191 #define VM_FAULT_RESULT_TRACE \
1192 { VM_FAULT_OOM, "OOM" }, \
1193 { VM_FAULT_SIGBUS, "SIGBUS" }, \
1194 { VM_FAULT_MAJOR, "MAJOR" }, \
1195 { VM_FAULT_WRITE, "WRITE" }, \
1196 { VM_FAULT_HWPOISON, "HWPOISON" }, \
1197 { VM_FAULT_HWPOISON_LARGE, "HWPOISON_LARGE" }, \
1198 { VM_FAULT_SIGSEGV, "SIGSEGV" }, \
1199 { VM_FAULT_NOPAGE, "NOPAGE" }, \
1200 { VM_FAULT_LOCKED, "LOCKED" }, \
1201 { VM_FAULT_RETRY, "RETRY" }, \
1202 { VM_FAULT_FALLBACK, "FALLBACK" }, \
1203 { VM_FAULT_DONE_COW, "DONE_COW" }
1205 /* Encode hstate index for a hwpoisoned large page */
1206 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1207 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1210 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1212 extern void pagefault_out_of_memory(void);
1214 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1217 * Flags passed to show_mem() and show_free_areas() to suppress output in
1220 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1222 extern void show_free_areas(unsigned int flags
, nodemask_t
*nodemask
);
1224 extern bool can_do_mlock(void);
1225 extern int user_shm_lock(size_t, struct user_struct
*);
1226 extern void user_shm_unlock(size_t, struct user_struct
*);
1229 * Parameter block passed down to zap_pte_range in exceptional cases.
1231 struct zap_details
{
1232 struct address_space
*check_mapping
; /* Check page->mapping if set */
1233 pgoff_t first_index
; /* Lowest page->index to unmap */
1234 pgoff_t last_index
; /* Highest page->index to unmap */
1237 struct page
*_vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
1238 pte_t pte
, bool with_public_device
);
1239 #define vm_normal_page(vma, addr, pte) _vm_normal_page(vma, addr, pte, false)
1241 struct page
*vm_normal_page_pmd(struct vm_area_struct
*vma
, unsigned long addr
,
1244 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
1245 unsigned long size
);
1246 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
1247 unsigned long size
);
1248 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
1249 unsigned long start
, unsigned long end
);
1252 * mm_walk - callbacks for walk_page_range
1253 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1254 * this handler should only handle pud_trans_huge() puds.
1255 * the pmd_entry or pte_entry callbacks will be used for
1257 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1258 * this handler is required to be able to handle
1259 * pmd_trans_huge() pmds. They may simply choose to
1260 * split_huge_page() instead of handling it explicitly.
1261 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1262 * @pte_hole: if set, called for each hole at all levels
1263 * @hugetlb_entry: if set, called for each hugetlb entry
1264 * @test_walk: caller specific callback function to determine whether
1265 * we walk over the current vma or not. Returning 0
1266 * value means "do page table walk over the current vma,"
1267 * and a negative one means "abort current page table walk
1268 * right now." 1 means "skip the current vma."
1269 * @mm: mm_struct representing the target process of page table walk
1270 * @vma: vma currently walked (NULL if walking outside vmas)
1271 * @private: private data for callbacks' usage
1273 * (see the comment on walk_page_range() for more details)
1276 int (*pud_entry
)(pud_t
*pud
, unsigned long addr
,
1277 unsigned long next
, struct mm_walk
*walk
);
1278 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
1279 unsigned long next
, struct mm_walk
*walk
);
1280 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
1281 unsigned long next
, struct mm_walk
*walk
);
1282 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
1283 struct mm_walk
*walk
);
1284 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
1285 unsigned long addr
, unsigned long next
,
1286 struct mm_walk
*walk
);
1287 int (*test_walk
)(unsigned long addr
, unsigned long next
,
1288 struct mm_walk
*walk
);
1289 struct mm_struct
*mm
;
1290 struct vm_area_struct
*vma
;
1294 int walk_page_range(unsigned long addr
, unsigned long end
,
1295 struct mm_walk
*walk
);
1296 int walk_page_vma(struct vm_area_struct
*vma
, struct mm_walk
*walk
);
1297 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1298 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1299 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1300 struct vm_area_struct
*vma
);
1301 void unmap_mapping_range(struct address_space
*mapping
,
1302 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1303 int follow_pte_pmd(struct mm_struct
*mm
, unsigned long address
,
1304 unsigned long *start
, unsigned long *end
,
1305 pte_t
**ptepp
, pmd_t
**pmdpp
, spinlock_t
**ptlp
);
1306 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1307 unsigned long *pfn
);
1308 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1309 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1310 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1311 void *buf
, int len
, int write
);
1313 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1314 loff_t
const holebegin
, loff_t
const holelen
)
1316 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1319 extern void truncate_pagecache(struct inode
*inode
, loff_t
new);
1320 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1321 void pagecache_isize_extended(struct inode
*inode
, loff_t from
, loff_t to
);
1322 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1323 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1324 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1325 int invalidate_inode_page(struct page
*page
);
1328 extern int handle_mm_fault(struct vm_area_struct
*vma
, unsigned long address
,
1329 unsigned int flags
);
1330 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1331 unsigned long address
, unsigned int fault_flags
,
1334 static inline int handle_mm_fault(struct vm_area_struct
*vma
,
1335 unsigned long address
, unsigned int flags
)
1337 /* should never happen if there's no MMU */
1339 return VM_FAULT_SIGBUS
;
1341 static inline int fixup_user_fault(struct task_struct
*tsk
,
1342 struct mm_struct
*mm
, unsigned long address
,
1343 unsigned int fault_flags
, bool *unlocked
)
1345 /* should never happen if there's no MMU */
1351 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
,
1352 unsigned int gup_flags
);
1353 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1354 void *buf
, int len
, unsigned int gup_flags
);
1355 extern int __access_remote_vm(struct task_struct
*tsk
, struct mm_struct
*mm
,
1356 unsigned long addr
, void *buf
, int len
, unsigned int gup_flags
);
1358 long get_user_pages_remote(struct task_struct
*tsk
, struct mm_struct
*mm
,
1359 unsigned long start
, unsigned long nr_pages
,
1360 unsigned int gup_flags
, struct page
**pages
,
1361 struct vm_area_struct
**vmas
, int *locked
);
1362 long get_user_pages(unsigned long start
, unsigned long nr_pages
,
1363 unsigned int gup_flags
, struct page
**pages
,
1364 struct vm_area_struct
**vmas
);
1365 long get_user_pages_locked(unsigned long start
, unsigned long nr_pages
,
1366 unsigned int gup_flags
, struct page
**pages
, int *locked
);
1367 long get_user_pages_unlocked(unsigned long start
, unsigned long nr_pages
,
1368 struct page
**pages
, unsigned int gup_flags
);
1369 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1370 struct page
**pages
);
1372 /* Container for pinned pfns / pages */
1373 struct frame_vector
{
1374 unsigned int nr_allocated
; /* Number of frames we have space for */
1375 unsigned int nr_frames
; /* Number of frames stored in ptrs array */
1376 bool got_ref
; /* Did we pin pages by getting page ref? */
1377 bool is_pfns
; /* Does array contain pages or pfns? */
1378 void *ptrs
[0]; /* Array of pinned pfns / pages. Use
1379 * pfns_vector_pages() or pfns_vector_pfns()
1383 struct frame_vector
*frame_vector_create(unsigned int nr_frames
);
1384 void frame_vector_destroy(struct frame_vector
*vec
);
1385 int get_vaddr_frames(unsigned long start
, unsigned int nr_pfns
,
1386 unsigned int gup_flags
, struct frame_vector
*vec
);
1387 void put_vaddr_frames(struct frame_vector
*vec
);
1388 int frame_vector_to_pages(struct frame_vector
*vec
);
1389 void frame_vector_to_pfns(struct frame_vector
*vec
);
1391 static inline unsigned int frame_vector_count(struct frame_vector
*vec
)
1393 return vec
->nr_frames
;
1396 static inline struct page
**frame_vector_pages(struct frame_vector
*vec
)
1399 int err
= frame_vector_to_pages(vec
);
1402 return ERR_PTR(err
);
1404 return (struct page
**)(vec
->ptrs
);
1407 static inline unsigned long *frame_vector_pfns(struct frame_vector
*vec
)
1410 frame_vector_to_pfns(vec
);
1411 return (unsigned long *)(vec
->ptrs
);
1415 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1416 struct page
**pages
);
1417 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1418 struct page
*get_dump_page(unsigned long addr
);
1420 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1421 extern void do_invalidatepage(struct page
*page
, unsigned int offset
,
1422 unsigned int length
);
1424 int __set_page_dirty_nobuffers(struct page
*page
);
1425 int __set_page_dirty_no_writeback(struct page
*page
);
1426 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1428 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1429 void account_page_cleaned(struct page
*page
, struct address_space
*mapping
,
1430 struct bdi_writeback
*wb
);
1431 int set_page_dirty(struct page
*page
);
1432 int set_page_dirty_lock(struct page
*page
);
1433 void cancel_dirty_page(struct page
*page
);
1434 int clear_page_dirty_for_io(struct page
*page
);
1436 int get_cmdline(struct task_struct
*task
, char *buffer
, int buflen
);
1438 static inline bool vma_is_anonymous(struct vm_area_struct
*vma
)
1440 return !vma
->vm_ops
;
1445 * The vma_is_shmem is not inline because it is used only by slow
1446 * paths in userfault.
1448 bool vma_is_shmem(struct vm_area_struct
*vma
);
1450 static inline bool vma_is_shmem(struct vm_area_struct
*vma
) { return false; }
1453 int vma_is_stack_for_current(struct vm_area_struct
*vma
);
1455 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1456 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1457 unsigned long new_addr
, unsigned long len
,
1458 bool need_rmap_locks
);
1459 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1460 unsigned long end
, pgprot_t newprot
,
1461 int dirty_accountable
, int prot_numa
);
1462 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1463 struct vm_area_struct
**pprev
, unsigned long start
,
1464 unsigned long end
, unsigned long newflags
);
1467 * doesn't attempt to fault and will return short.
1469 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1470 struct page
**pages
);
1472 * per-process(per-mm_struct) statistics.
1474 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1476 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1478 #ifdef SPLIT_RSS_COUNTING
1480 * counter is updated in asynchronous manner and may go to minus.
1481 * But it's never be expected number for users.
1486 return (unsigned long)val
;
1489 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1491 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1494 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1496 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1499 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1501 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1504 /* Optimized variant when page is already known not to be PageAnon */
1505 static inline int mm_counter_file(struct page
*page
)
1507 if (PageSwapBacked(page
))
1508 return MM_SHMEMPAGES
;
1509 return MM_FILEPAGES
;
1512 static inline int mm_counter(struct page
*page
)
1515 return MM_ANONPAGES
;
1516 return mm_counter_file(page
);
1519 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1521 return get_mm_counter(mm
, MM_FILEPAGES
) +
1522 get_mm_counter(mm
, MM_ANONPAGES
) +
1523 get_mm_counter(mm
, MM_SHMEMPAGES
);
1526 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1528 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1531 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1533 return max(mm
->hiwater_vm
, mm
->total_vm
);
1536 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1538 unsigned long _rss
= get_mm_rss(mm
);
1540 if ((mm
)->hiwater_rss
< _rss
)
1541 (mm
)->hiwater_rss
= _rss
;
1544 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1546 if (mm
->hiwater_vm
< mm
->total_vm
)
1547 mm
->hiwater_vm
= mm
->total_vm
;
1550 static inline void reset_mm_hiwater_rss(struct mm_struct
*mm
)
1552 mm
->hiwater_rss
= get_mm_rss(mm
);
1555 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1556 struct mm_struct
*mm
)
1558 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1560 if (*maxrss
< hiwater_rss
)
1561 *maxrss
= hiwater_rss
;
1564 #if defined(SPLIT_RSS_COUNTING)
1565 void sync_mm_rss(struct mm_struct
*mm
);
1567 static inline void sync_mm_rss(struct mm_struct
*mm
)
1572 #ifndef __HAVE_ARCH_PTE_DEVMAP
1573 static inline int pte_devmap(pte_t pte
)
1579 int vma_wants_writenotify(struct vm_area_struct
*vma
, pgprot_t vm_page_prot
);
1581 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1583 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1587 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1591 #ifdef __PAGETABLE_P4D_FOLDED
1592 static inline int __p4d_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1593 unsigned long address
)
1598 int __p4d_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1601 #ifdef __PAGETABLE_PUD_FOLDED
1602 static inline int __pud_alloc(struct mm_struct
*mm
, p4d_t
*p4d
,
1603 unsigned long address
)
1608 int __pud_alloc(struct mm_struct
*mm
, p4d_t
*p4d
, unsigned long address
);
1611 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1612 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1613 unsigned long address
)
1618 static inline void mm_nr_pmds_init(struct mm_struct
*mm
) {}
1620 static inline unsigned long mm_nr_pmds(struct mm_struct
*mm
)
1625 static inline void mm_inc_nr_pmds(struct mm_struct
*mm
) {}
1626 static inline void mm_dec_nr_pmds(struct mm_struct
*mm
) {}
1629 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1631 static inline void mm_nr_pmds_init(struct mm_struct
*mm
)
1633 atomic_long_set(&mm
->nr_pmds
, 0);
1636 static inline unsigned long mm_nr_pmds(struct mm_struct
*mm
)
1638 return atomic_long_read(&mm
->nr_pmds
);
1641 static inline void mm_inc_nr_pmds(struct mm_struct
*mm
)
1643 atomic_long_inc(&mm
->nr_pmds
);
1646 static inline void mm_dec_nr_pmds(struct mm_struct
*mm
)
1648 atomic_long_dec(&mm
->nr_pmds
);
1652 int __pte_alloc(struct mm_struct
*mm
, pmd_t
*pmd
, unsigned long address
);
1653 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1656 * The following ifdef needed to get the 4level-fixup.h header to work.
1657 * Remove it when 4level-fixup.h has been removed.
1659 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1661 #ifndef __ARCH_HAS_5LEVEL_HACK
1662 static inline p4d_t
*p4d_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1663 unsigned long address
)
1665 return (unlikely(pgd_none(*pgd
)) && __p4d_alloc(mm
, pgd
, address
)) ?
1666 NULL
: p4d_offset(pgd
, address
);
1669 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, p4d_t
*p4d
,
1670 unsigned long address
)
1672 return (unlikely(p4d_none(*p4d
)) && __pud_alloc(mm
, p4d
, address
)) ?
1673 NULL
: pud_offset(p4d
, address
);
1675 #endif /* !__ARCH_HAS_5LEVEL_HACK */
1677 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1679 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1680 NULL
: pmd_offset(pud
, address
);
1682 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1684 #if USE_SPLIT_PTE_PTLOCKS
1685 #if ALLOC_SPLIT_PTLOCKS
1686 void __init
ptlock_cache_init(void);
1687 extern bool ptlock_alloc(struct page
*page
);
1688 extern void ptlock_free(struct page
*page
);
1690 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1694 #else /* ALLOC_SPLIT_PTLOCKS */
1695 static inline void ptlock_cache_init(void)
1699 static inline bool ptlock_alloc(struct page
*page
)
1704 static inline void ptlock_free(struct page
*page
)
1708 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1712 #endif /* ALLOC_SPLIT_PTLOCKS */
1714 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1716 return ptlock_ptr(pmd_page(*pmd
));
1719 static inline bool ptlock_init(struct page
*page
)
1722 * prep_new_page() initialize page->private (and therefore page->ptl)
1723 * with 0. Make sure nobody took it in use in between.
1725 * It can happen if arch try to use slab for page table allocation:
1726 * slab code uses page->slab_cache, which share storage with page->ptl.
1728 VM_BUG_ON_PAGE(*(unsigned long *)&page
->ptl
, page
);
1729 if (!ptlock_alloc(page
))
1731 spin_lock_init(ptlock_ptr(page
));
1735 /* Reset page->mapping so free_pages_check won't complain. */
1736 static inline void pte_lock_deinit(struct page
*page
)
1738 page
->mapping
= NULL
;
1742 #else /* !USE_SPLIT_PTE_PTLOCKS */
1744 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1746 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1748 return &mm
->page_table_lock
;
1750 static inline void ptlock_cache_init(void) {}
1751 static inline bool ptlock_init(struct page
*page
) { return true; }
1752 static inline void pte_lock_deinit(struct page
*page
) {}
1753 #endif /* USE_SPLIT_PTE_PTLOCKS */
1755 static inline void pgtable_init(void)
1757 ptlock_cache_init();
1758 pgtable_cache_init();
1761 static inline bool pgtable_page_ctor(struct page
*page
)
1763 if (!ptlock_init(page
))
1765 inc_zone_page_state(page
, NR_PAGETABLE
);
1769 static inline void pgtable_page_dtor(struct page
*page
)
1771 pte_lock_deinit(page
);
1772 dec_zone_page_state(page
, NR_PAGETABLE
);
1775 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1777 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1778 pte_t *__pte = pte_offset_map(pmd, address); \
1784 #define pte_unmap_unlock(pte, ptl) do { \
1789 #define pte_alloc(mm, pmd, address) \
1790 (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd, address))
1792 #define pte_alloc_map(mm, pmd, address) \
1793 (pte_alloc(mm, pmd, address) ? NULL : pte_offset_map(pmd, address))
1795 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1796 (pte_alloc(mm, pmd, address) ? \
1797 NULL : pte_offset_map_lock(mm, pmd, address, ptlp))
1799 #define pte_alloc_kernel(pmd, address) \
1800 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1801 NULL: pte_offset_kernel(pmd, address))
1803 #if USE_SPLIT_PMD_PTLOCKS
1805 static struct page
*pmd_to_page(pmd_t
*pmd
)
1807 unsigned long mask
= ~(PTRS_PER_PMD
* sizeof(pmd_t
) - 1);
1808 return virt_to_page((void *)((unsigned long) pmd
& mask
));
1811 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1813 return ptlock_ptr(pmd_to_page(pmd
));
1816 static inline bool pgtable_pmd_page_ctor(struct page
*page
)
1818 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1819 page
->pmd_huge_pte
= NULL
;
1821 return ptlock_init(page
);
1824 static inline void pgtable_pmd_page_dtor(struct page
*page
)
1826 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1827 VM_BUG_ON_PAGE(page
->pmd_huge_pte
, page
);
1832 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1836 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1838 return &mm
->page_table_lock
;
1841 static inline bool pgtable_pmd_page_ctor(struct page
*page
) { return true; }
1842 static inline void pgtable_pmd_page_dtor(struct page
*page
) {}
1844 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1848 static inline spinlock_t
*pmd_lock(struct mm_struct
*mm
, pmd_t
*pmd
)
1850 spinlock_t
*ptl
= pmd_lockptr(mm
, pmd
);
1856 * No scalability reason to split PUD locks yet, but follow the same pattern
1857 * as the PMD locks to make it easier if we decide to. The VM should not be
1858 * considered ready to switch to split PUD locks yet; there may be places
1859 * which need to be converted from page_table_lock.
1861 static inline spinlock_t
*pud_lockptr(struct mm_struct
*mm
, pud_t
*pud
)
1863 return &mm
->page_table_lock
;
1866 static inline spinlock_t
*pud_lock(struct mm_struct
*mm
, pud_t
*pud
)
1868 spinlock_t
*ptl
= pud_lockptr(mm
, pud
);
1874 extern void __init
pagecache_init(void);
1875 extern void free_area_init(unsigned long * zones_size
);
1876 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1877 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1878 extern void free_initmem(void);
1881 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1882 * into the buddy system. The freed pages will be poisoned with pattern
1883 * "poison" if it's within range [0, UCHAR_MAX].
1884 * Return pages freed into the buddy system.
1886 extern unsigned long free_reserved_area(void *start
, void *end
,
1887 int poison
, char *s
);
1889 #ifdef CONFIG_HIGHMEM
1891 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1892 * and totalram_pages.
1894 extern void free_highmem_page(struct page
*page
);
1897 extern void adjust_managed_page_count(struct page
*page
, long count
);
1898 extern void mem_init_print_info(const char *str
);
1900 extern void reserve_bootmem_region(phys_addr_t start
, phys_addr_t end
);
1902 /* Free the reserved page into the buddy system, so it gets managed. */
1903 static inline void __free_reserved_page(struct page
*page
)
1905 ClearPageReserved(page
);
1906 init_page_count(page
);
1910 static inline void free_reserved_page(struct page
*page
)
1912 __free_reserved_page(page
);
1913 adjust_managed_page_count(page
, 1);
1916 static inline void mark_page_reserved(struct page
*page
)
1918 SetPageReserved(page
);
1919 adjust_managed_page_count(page
, -1);
1923 * Default method to free all the __init memory into the buddy system.
1924 * The freed pages will be poisoned with pattern "poison" if it's within
1925 * range [0, UCHAR_MAX].
1926 * Return pages freed into the buddy system.
1928 static inline unsigned long free_initmem_default(int poison
)
1930 extern char __init_begin
[], __init_end
[];
1932 return free_reserved_area(&__init_begin
, &__init_end
,
1933 poison
, "unused kernel");
1936 static inline unsigned long get_num_physpages(void)
1939 unsigned long phys_pages
= 0;
1941 for_each_online_node(nid
)
1942 phys_pages
+= node_present_pages(nid
);
1947 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1949 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1950 * zones, allocate the backing mem_map and account for memory holes in a more
1951 * architecture independent manner. This is a substitute for creating the
1952 * zone_sizes[] and zholes_size[] arrays and passing them to
1953 * free_area_init_node()
1955 * An architecture is expected to register range of page frames backed by
1956 * physical memory with memblock_add[_node]() before calling
1957 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1958 * usage, an architecture is expected to do something like
1960 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1962 * for_each_valid_physical_page_range()
1963 * memblock_add_node(base, size, nid)
1964 * free_area_init_nodes(max_zone_pfns);
1966 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1967 * registered physical page range. Similarly
1968 * sparse_memory_present_with_active_regions() calls memory_present() for
1969 * each range when SPARSEMEM is enabled.
1971 * See mm/page_alloc.c for more information on each function exposed by
1972 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1974 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1975 unsigned long node_map_pfn_alignment(void);
1976 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1977 unsigned long end_pfn
);
1978 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1979 unsigned long end_pfn
);
1980 extern void get_pfn_range_for_nid(unsigned int nid
,
1981 unsigned long *start_pfn
, unsigned long *end_pfn
);
1982 extern unsigned long find_min_pfn_with_active_regions(void);
1983 extern void free_bootmem_with_active_regions(int nid
,
1984 unsigned long max_low_pfn
);
1985 extern void sparse_memory_present_with_active_regions(int nid
);
1987 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1989 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1990 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1991 static inline int __early_pfn_to_nid(unsigned long pfn
,
1992 struct mminit_pfnnid_cache
*state
)
1997 /* please see mm/page_alloc.c */
1998 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1999 /* there is a per-arch backend function. */
2000 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
,
2001 struct mminit_pfnnid_cache
*state
);
2004 extern void set_dma_reserve(unsigned long new_dma_reserve
);
2005 extern void memmap_init_zone(unsigned long, int, unsigned long,
2006 unsigned long, enum memmap_context
);
2007 extern void setup_per_zone_wmarks(void);
2008 extern int __meminit
init_per_zone_wmark_min(void);
2009 extern void mem_init(void);
2010 extern void __init
mmap_init(void);
2011 extern void show_mem(unsigned int flags
, nodemask_t
*nodemask
);
2012 extern long si_mem_available(void);
2013 extern void si_meminfo(struct sysinfo
* val
);
2014 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
2015 #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES
2016 extern unsigned long arch_reserved_kernel_pages(void);
2019 extern __printf(3, 4)
2020 void warn_alloc(gfp_t gfp_mask
, nodemask_t
*nodemask
, const char *fmt
, ...);
2022 extern void setup_per_cpu_pageset(void);
2024 extern void zone_pcp_update(struct zone
*zone
);
2025 extern void zone_pcp_reset(struct zone
*zone
);
2028 extern int min_free_kbytes
;
2029 extern int watermark_scale_factor
;
2032 extern atomic_long_t mmap_pages_allocated
;
2033 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
2035 /* interval_tree.c */
2036 void vma_interval_tree_insert(struct vm_area_struct
*node
,
2037 struct rb_root_cached
*root
);
2038 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
2039 struct vm_area_struct
*prev
,
2040 struct rb_root_cached
*root
);
2041 void vma_interval_tree_remove(struct vm_area_struct
*node
,
2042 struct rb_root_cached
*root
);
2043 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root_cached
*root
,
2044 unsigned long start
, unsigned long last
);
2045 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
2046 unsigned long start
, unsigned long last
);
2048 #define vma_interval_tree_foreach(vma, root, start, last) \
2049 for (vma = vma_interval_tree_iter_first(root, start, last); \
2050 vma; vma = vma_interval_tree_iter_next(vma, start, last))
2052 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
2053 struct rb_root_cached
*root
);
2054 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
2055 struct rb_root_cached
*root
);
2056 struct anon_vma_chain
*
2057 anon_vma_interval_tree_iter_first(struct rb_root_cached
*root
,
2058 unsigned long start
, unsigned long last
);
2059 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
2060 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
2061 #ifdef CONFIG_DEBUG_VM_RB
2062 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
2065 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
2066 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
2067 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
2070 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
2071 extern int __vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
2072 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
,
2073 struct vm_area_struct
*expand
);
2074 static inline int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
2075 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
)
2077 return __vma_adjust(vma
, start
, end
, pgoff
, insert
, NULL
);
2079 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
2080 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
2081 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
2082 struct mempolicy
*, struct vm_userfaultfd_ctx
);
2083 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
2084 extern int __split_vma(struct mm_struct
*, struct vm_area_struct
*,
2085 unsigned long addr
, int new_below
);
2086 extern int split_vma(struct mm_struct
*, struct vm_area_struct
*,
2087 unsigned long addr
, int new_below
);
2088 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
2089 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
2090 struct rb_node
**, struct rb_node
*);
2091 extern void unlink_file_vma(struct vm_area_struct
*);
2092 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
2093 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
2094 bool *need_rmap_locks
);
2095 extern void exit_mmap(struct mm_struct
*);
2097 static inline int check_data_rlimit(unsigned long rlim
,
2099 unsigned long start
,
2100 unsigned long end_data
,
2101 unsigned long start_data
)
2103 if (rlim
< RLIM_INFINITY
) {
2104 if (((new - start
) + (end_data
- start_data
)) > rlim
)
2111 extern int mm_take_all_locks(struct mm_struct
*mm
);
2112 extern void mm_drop_all_locks(struct mm_struct
*mm
);
2114 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
2115 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
2116 extern struct file
*get_task_exe_file(struct task_struct
*task
);
2118 extern bool may_expand_vm(struct mm_struct
*, vm_flags_t
, unsigned long npages
);
2119 extern void vm_stat_account(struct mm_struct
*, vm_flags_t
, long npages
);
2121 extern bool vma_is_special_mapping(const struct vm_area_struct
*vma
,
2122 const struct vm_special_mapping
*sm
);
2123 extern struct vm_area_struct
*_install_special_mapping(struct mm_struct
*mm
,
2124 unsigned long addr
, unsigned long len
,
2125 unsigned long flags
,
2126 const struct vm_special_mapping
*spec
);
2127 /* This is an obsolete alternative to _install_special_mapping. */
2128 extern int install_special_mapping(struct mm_struct
*mm
,
2129 unsigned long addr
, unsigned long len
,
2130 unsigned long flags
, struct page
**pages
);
2132 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
2134 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
2135 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
,
2136 struct list_head
*uf
);
2137 extern unsigned long do_mmap(struct file
*file
, unsigned long addr
,
2138 unsigned long len
, unsigned long prot
, unsigned long flags
,
2139 vm_flags_t vm_flags
, unsigned long pgoff
, unsigned long *populate
,
2140 struct list_head
*uf
);
2141 extern int do_munmap(struct mm_struct
*, unsigned long, size_t,
2142 struct list_head
*uf
);
2144 static inline unsigned long
2145 do_mmap_pgoff(struct file
*file
, unsigned long addr
,
2146 unsigned long len
, unsigned long prot
, unsigned long flags
,
2147 unsigned long pgoff
, unsigned long *populate
,
2148 struct list_head
*uf
)
2150 return do_mmap(file
, addr
, len
, prot
, flags
, 0, pgoff
, populate
, uf
);
2154 extern int __mm_populate(unsigned long addr
, unsigned long len
,
2156 static inline void mm_populate(unsigned long addr
, unsigned long len
)
2159 (void) __mm_populate(addr
, len
, 1);
2162 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
2165 /* These take the mm semaphore themselves */
2166 extern int __must_check
vm_brk(unsigned long, unsigned long);
2167 extern int __must_check
vm_brk_flags(unsigned long, unsigned long, unsigned long);
2168 extern int vm_munmap(unsigned long, size_t);
2169 extern unsigned long __must_check
vm_mmap(struct file
*, unsigned long,
2170 unsigned long, unsigned long,
2171 unsigned long, unsigned long);
2173 struct vm_unmapped_area_info
{
2174 #define VM_UNMAPPED_AREA_TOPDOWN 1
2175 unsigned long flags
;
2176 unsigned long length
;
2177 unsigned long low_limit
;
2178 unsigned long high_limit
;
2179 unsigned long align_mask
;
2180 unsigned long align_offset
;
2183 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
2184 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
2187 * Search for an unmapped address range.
2189 * We are looking for a range that:
2190 * - does not intersect with any VMA;
2191 * - is contained within the [low_limit, high_limit) interval;
2192 * - is at least the desired size.
2193 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
2195 static inline unsigned long
2196 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
2198 if (info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
)
2199 return unmapped_area_topdown(info
);
2201 return unmapped_area(info
);
2205 extern void truncate_inode_pages(struct address_space
*, loff_t
);
2206 extern void truncate_inode_pages_range(struct address_space
*,
2207 loff_t lstart
, loff_t lend
);
2208 extern void truncate_inode_pages_final(struct address_space
*);
2210 /* generic vm_area_ops exported for stackable file systems */
2211 extern int filemap_fault(struct vm_fault
*vmf
);
2212 extern void filemap_map_pages(struct vm_fault
*vmf
,
2213 pgoff_t start_pgoff
, pgoff_t end_pgoff
);
2214 extern int filemap_page_mkwrite(struct vm_fault
*vmf
);
2216 /* mm/page-writeback.c */
2217 int __must_check
write_one_page(struct page
*page
);
2218 void task_dirty_inc(struct task_struct
*tsk
);
2221 #define VM_MAX_READAHEAD 128 /* kbytes */
2222 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
2224 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
2225 pgoff_t offset
, unsigned long nr_to_read
);
2227 void page_cache_sync_readahead(struct address_space
*mapping
,
2228 struct file_ra_state
*ra
,
2231 unsigned long size
);
2233 void page_cache_async_readahead(struct address_space
*mapping
,
2234 struct file_ra_state
*ra
,
2238 unsigned long size
);
2240 extern unsigned long stack_guard_gap
;
2241 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
2242 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
2244 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
2245 extern int expand_downwards(struct vm_area_struct
*vma
,
2246 unsigned long address
);
2248 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
2250 #define expand_upwards(vma, address) (0)
2253 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
2254 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
2255 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
2256 struct vm_area_struct
**pprev
);
2258 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
2259 NULL if none. Assume start_addr < end_addr. */
2260 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
2262 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
2264 if (vma
&& end_addr
<= vma
->vm_start
)
2269 static inline unsigned long vm_start_gap(struct vm_area_struct
*vma
)
2271 unsigned long vm_start
= vma
->vm_start
;
2273 if (vma
->vm_flags
& VM_GROWSDOWN
) {
2274 vm_start
-= stack_guard_gap
;
2275 if (vm_start
> vma
->vm_start
)
2281 static inline unsigned long vm_end_gap(struct vm_area_struct
*vma
)
2283 unsigned long vm_end
= vma
->vm_end
;
2285 if (vma
->vm_flags
& VM_GROWSUP
) {
2286 vm_end
+= stack_guard_gap
;
2287 if (vm_end
< vma
->vm_end
)
2288 vm_end
= -PAGE_SIZE
;
2293 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
2295 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
2298 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2299 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
2300 unsigned long vm_start
, unsigned long vm_end
)
2302 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
2304 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
2311 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
2312 void vma_set_page_prot(struct vm_area_struct
*vma
);
2314 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
2318 static inline void vma_set_page_prot(struct vm_area_struct
*vma
)
2320 vma
->vm_page_prot
= vm_get_page_prot(vma
->vm_flags
);
2324 #ifdef CONFIG_NUMA_BALANCING
2325 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
2326 unsigned long start
, unsigned long end
);
2329 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
2330 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
2331 unsigned long pfn
, unsigned long size
, pgprot_t
);
2332 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
2333 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
2335 int vm_insert_pfn_prot(struct vm_area_struct
*vma
, unsigned long addr
,
2336 unsigned long pfn
, pgprot_t pgprot
);
2337 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
2339 int vm_insert_mixed_mkwrite(struct vm_area_struct
*vma
, unsigned long addr
,
2341 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
2344 struct page
*follow_page_mask(struct vm_area_struct
*vma
,
2345 unsigned long address
, unsigned int foll_flags
,
2346 unsigned int *page_mask
);
2348 static inline struct page
*follow_page(struct vm_area_struct
*vma
,
2349 unsigned long address
, unsigned int foll_flags
)
2351 unsigned int unused_page_mask
;
2352 return follow_page_mask(vma
, address
, foll_flags
, &unused_page_mask
);
2355 #define FOLL_WRITE 0x01 /* check pte is writable */
2356 #define FOLL_TOUCH 0x02 /* mark page accessed */
2357 #define FOLL_GET 0x04 /* do get_page on page */
2358 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2359 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2360 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2361 * and return without waiting upon it */
2362 #define FOLL_POPULATE 0x40 /* fault in page */
2363 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2364 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2365 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2366 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2367 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2368 #define FOLL_MLOCK 0x1000 /* lock present pages */
2369 #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */
2370 #define FOLL_COW 0x4000 /* internal GUP flag */
2372 static inline int vm_fault_to_errno(int vm_fault
, int foll_flags
)
2374 if (vm_fault
& VM_FAULT_OOM
)
2376 if (vm_fault
& (VM_FAULT_HWPOISON
| VM_FAULT_HWPOISON_LARGE
))
2377 return (foll_flags
& FOLL_HWPOISON
) ? -EHWPOISON
: -EFAULT
;
2378 if (vm_fault
& (VM_FAULT_SIGBUS
| VM_FAULT_SIGSEGV
))
2383 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
2385 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
2386 unsigned long size
, pte_fn_t fn
, void *data
);
2389 #ifdef CONFIG_PAGE_POISONING
2390 extern bool page_poisoning_enabled(void);
2391 extern void kernel_poison_pages(struct page
*page
, int numpages
, int enable
);
2392 extern bool page_is_poisoned(struct page
*page
);
2394 static inline bool page_poisoning_enabled(void) { return false; }
2395 static inline void kernel_poison_pages(struct page
*page
, int numpages
,
2397 static inline bool page_is_poisoned(struct page
*page
) { return false; }
2400 #ifdef CONFIG_DEBUG_PAGEALLOC
2401 extern bool _debug_pagealloc_enabled
;
2402 extern void __kernel_map_pages(struct page
*page
, int numpages
, int enable
);
2404 static inline bool debug_pagealloc_enabled(void)
2406 return _debug_pagealloc_enabled
;
2410 kernel_map_pages(struct page
*page
, int numpages
, int enable
)
2412 if (!debug_pagealloc_enabled())
2415 __kernel_map_pages(page
, numpages
, enable
);
2417 #ifdef CONFIG_HIBERNATION
2418 extern bool kernel_page_present(struct page
*page
);
2419 #endif /* CONFIG_HIBERNATION */
2420 #else /* CONFIG_DEBUG_PAGEALLOC */
2422 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
2423 #ifdef CONFIG_HIBERNATION
2424 static inline bool kernel_page_present(struct page
*page
) { return true; }
2425 #endif /* CONFIG_HIBERNATION */
2426 static inline bool debug_pagealloc_enabled(void)
2430 #endif /* CONFIG_DEBUG_PAGEALLOC */
2432 #ifdef __HAVE_ARCH_GATE_AREA
2433 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
2434 extern int in_gate_area_no_mm(unsigned long addr
);
2435 extern int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
2437 static inline struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
)
2441 static inline int in_gate_area_no_mm(unsigned long addr
) { return 0; }
2442 static inline int in_gate_area(struct mm_struct
*mm
, unsigned long addr
)
2446 #endif /* __HAVE_ARCH_GATE_AREA */
2448 extern bool process_shares_mm(struct task_struct
*p
, struct mm_struct
*mm
);
2450 #ifdef CONFIG_SYSCTL
2451 extern int sysctl_drop_caches
;
2452 int drop_caches_sysctl_handler(struct ctl_table
*, int,
2453 void __user
*, size_t *, loff_t
*);
2456 void drop_slab(void);
2457 void drop_slab_node(int nid
);
2460 #define randomize_va_space 0
2462 extern int randomize_va_space
;
2465 const char * arch_vma_name(struct vm_area_struct
*vma
);
2466 void print_vma_addr(char *prefix
, unsigned long rip
);
2468 void sparse_mem_maps_populate_node(struct page
**map_map
,
2469 unsigned long pnum_begin
,
2470 unsigned long pnum_end
,
2471 unsigned long map_count
,
2474 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
2475 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
2476 p4d_t
*vmemmap_p4d_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
2477 pud_t
*vmemmap_pud_populate(p4d_t
*p4d
, unsigned long addr
, int node
);
2478 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
2479 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
2480 void *vmemmap_alloc_block(unsigned long size
, int node
);
2482 void *__vmemmap_alloc_block_buf(unsigned long size
, int node
,
2483 struct vmem_altmap
*altmap
);
2484 static inline void *vmemmap_alloc_block_buf(unsigned long size
, int node
)
2486 return __vmemmap_alloc_block_buf(size
, node
, NULL
);
2489 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
2490 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
2492 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
);
2493 void vmemmap_populate_print_last(void);
2494 #ifdef CONFIG_MEMORY_HOTPLUG
2495 void vmemmap_free(unsigned long start
, unsigned long end
);
2497 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
2498 unsigned long size
);
2501 MF_COUNT_INCREASED
= 1 << 0,
2502 MF_ACTION_REQUIRED
= 1 << 1,
2503 MF_MUST_KILL
= 1 << 2,
2504 MF_SOFT_OFFLINE
= 1 << 3,
2506 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
2507 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
2508 extern int unpoison_memory(unsigned long pfn
);
2509 extern int get_hwpoison_page(struct page
*page
);
2510 #define put_hwpoison_page(page) put_page(page)
2511 extern int sysctl_memory_failure_early_kill
;
2512 extern int sysctl_memory_failure_recovery
;
2513 extern void shake_page(struct page
*p
, int access
);
2514 extern atomic_long_t num_poisoned_pages
;
2515 extern int soft_offline_page(struct page
*page
, int flags
);
2519 * Error handlers for various types of pages.
2522 MF_IGNORED
, /* Error: cannot be handled */
2523 MF_FAILED
, /* Error: handling failed */
2524 MF_DELAYED
, /* Will be handled later */
2525 MF_RECOVERED
, /* Successfully recovered */
2528 enum mf_action_page_type
{
2530 MF_MSG_KERNEL_HIGH_ORDER
,
2532 MF_MSG_DIFFERENT_COMPOUND
,
2533 MF_MSG_POISONED_HUGE
,
2536 MF_MSG_UNMAP_FAILED
,
2537 MF_MSG_DIRTY_SWAPCACHE
,
2538 MF_MSG_CLEAN_SWAPCACHE
,
2539 MF_MSG_DIRTY_MLOCKED_LRU
,
2540 MF_MSG_CLEAN_MLOCKED_LRU
,
2541 MF_MSG_DIRTY_UNEVICTABLE_LRU
,
2542 MF_MSG_CLEAN_UNEVICTABLE_LRU
,
2545 MF_MSG_TRUNCATED_LRU
,
2551 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2552 extern void clear_huge_page(struct page
*page
,
2553 unsigned long addr_hint
,
2554 unsigned int pages_per_huge_page
);
2555 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
2556 unsigned long addr
, struct vm_area_struct
*vma
,
2557 unsigned int pages_per_huge_page
);
2558 extern long copy_huge_page_from_user(struct page
*dst_page
,
2559 const void __user
*usr_src
,
2560 unsigned int pages_per_huge_page
,
2561 bool allow_pagefault
);
2562 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2564 extern struct page_ext_operations debug_guardpage_ops
;
2566 #ifdef CONFIG_DEBUG_PAGEALLOC
2567 extern unsigned int _debug_guardpage_minorder
;
2568 extern bool _debug_guardpage_enabled
;
2570 static inline unsigned int debug_guardpage_minorder(void)
2572 return _debug_guardpage_minorder
;
2575 static inline bool debug_guardpage_enabled(void)
2577 return _debug_guardpage_enabled
;
2580 static inline bool page_is_guard(struct page
*page
)
2582 struct page_ext
*page_ext
;
2584 if (!debug_guardpage_enabled())
2587 page_ext
= lookup_page_ext(page
);
2588 if (unlikely(!page_ext
))
2591 return test_bit(PAGE_EXT_DEBUG_GUARD
, &page_ext
->flags
);
2594 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2595 static inline bool debug_guardpage_enabled(void) { return false; }
2596 static inline bool page_is_guard(struct page
*page
) { return false; }
2597 #endif /* CONFIG_DEBUG_PAGEALLOC */
2599 #if MAX_NUMNODES > 1
2600 void __init
setup_nr_node_ids(void);
2602 static inline void setup_nr_node_ids(void) {}
2605 #endif /* __KERNEL__ */
2606 #endif /* _LINUX_MM_H */