1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/errno.h>
9 #include <linux/mmdebug.h>
10 #include <linux/gfp.h>
11 #include <linux/bug.h>
12 #include <linux/list.h>
13 #include <linux/mmzone.h>
14 #include <linux/rbtree.h>
15 #include <linux/atomic.h>
16 #include <linux/debug_locks.h>
17 #include <linux/mm_types.h>
18 #include <linux/range.h>
19 #include <linux/pfn.h>
20 #include <linux/percpu-refcount.h>
21 #include <linux/bit_spinlock.h>
22 #include <linux/shrinker.h>
23 #include <linux/resource.h>
24 #include <linux/page_ext.h>
25 #include <linux/err.h>
26 #include <linux/page_ref.h>
27 #include <linux/memremap.h>
28 #include <linux/overflow.h>
32 struct anon_vma_chain
;
35 struct writeback_control
;
38 void init_mm_internals(void);
40 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
41 extern unsigned long max_mapnr
;
43 static inline void set_max_mapnr(unsigned long limit
)
48 static inline void set_max_mapnr(unsigned long limit
) { }
51 extern atomic_long_t _totalram_pages
;
52 static inline unsigned long totalram_pages(void)
54 return (unsigned long)atomic_long_read(&_totalram_pages
);
57 static inline void totalram_pages_inc(void)
59 atomic_long_inc(&_totalram_pages
);
62 static inline void totalram_pages_dec(void)
64 atomic_long_dec(&_totalram_pages
);
67 static inline void totalram_pages_add(long count
)
69 atomic_long_add(count
, &_totalram_pages
);
72 static inline void totalram_pages_set(long val
)
74 atomic_long_set(&_totalram_pages
, val
);
77 extern void * high_memory
;
78 extern int page_cluster
;
81 extern int sysctl_legacy_va_layout
;
83 #define sysctl_legacy_va_layout 0
86 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
87 extern const int mmap_rnd_bits_min
;
88 extern const int mmap_rnd_bits_max
;
89 extern int mmap_rnd_bits __read_mostly
;
91 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
92 extern const int mmap_rnd_compat_bits_min
;
93 extern const int mmap_rnd_compat_bits_max
;
94 extern int mmap_rnd_compat_bits __read_mostly
;
98 #include <asm/pgtable.h>
99 #include <asm/processor.h>
102 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
106 #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
110 #define lm_alias(x) __va(__pa_symbol(x))
114 * To prevent common memory management code establishing
115 * a zero page mapping on a read fault.
116 * This macro should be defined within <asm/pgtable.h>.
117 * s390 does this to prevent multiplexing of hardware bits
118 * related to the physical page in case of virtualization.
120 #ifndef mm_forbids_zeropage
121 #define mm_forbids_zeropage(X) (0)
125 * On some architectures it is expensive to call memset() for small sizes.
126 * Those architectures should provide their own implementation of "struct page"
127 * zeroing by defining this macro in <asm/pgtable.h>.
129 #ifndef mm_zero_struct_page
130 #define mm_zero_struct_page(pp) ((void)memset((pp), 0, sizeof(struct page)))
134 * Default maximum number of active map areas, this limits the number of vmas
135 * per mm struct. Users can overwrite this number by sysctl but there is a
138 * When a program's coredump is generated as ELF format, a section is created
139 * per a vma. In ELF, the number of sections is represented in unsigned short.
140 * This means the number of sections should be smaller than 65535 at coredump.
141 * Because the kernel adds some informative sections to a image of program at
142 * generating coredump, we need some margin. The number of extra sections is
143 * 1-3 now and depends on arch. We use "5" as safe margin, here.
145 * ELF extended numbering allows more than 65535 sections, so 16-bit bound is
146 * not a hard limit any more. Although some userspace tools can be surprised by
149 #define MAPCOUNT_ELF_CORE_MARGIN (5)
150 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
152 extern int sysctl_max_map_count
;
154 extern unsigned long sysctl_user_reserve_kbytes
;
155 extern unsigned long sysctl_admin_reserve_kbytes
;
157 extern int sysctl_overcommit_memory
;
158 extern int sysctl_overcommit_ratio
;
159 extern unsigned long sysctl_overcommit_kbytes
;
161 extern int overcommit_ratio_handler(struct ctl_table
*, int, void __user
*,
163 extern int overcommit_kbytes_handler(struct ctl_table
*, int, void __user
*,
166 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
168 /* to align the pointer to the (next) page boundary */
169 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
171 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
172 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE)
174 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
177 * Linux kernel virtual memory manager primitives.
178 * The idea being to have a "virtual" mm in the same way
179 * we have a virtual fs - giving a cleaner interface to the
180 * mm details, and allowing different kinds of memory mappings
181 * (from shared memory to executable loading to arbitrary
185 struct vm_area_struct
*vm_area_alloc(struct mm_struct
*);
186 struct vm_area_struct
*vm_area_dup(struct vm_area_struct
*);
187 void vm_area_free(struct vm_area_struct
*);
190 extern struct rb_root nommu_region_tree
;
191 extern struct rw_semaphore nommu_region_sem
;
193 extern unsigned int kobjsize(const void *objp
);
197 * vm_flags in vm_area_struct, see mm_types.h.
198 * When changing, update also include/trace/events/mmflags.h
200 #define VM_NONE 0x00000000
202 #define VM_READ 0x00000001 /* currently active flags */
203 #define VM_WRITE 0x00000002
204 #define VM_EXEC 0x00000004
205 #define VM_SHARED 0x00000008
207 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
208 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
209 #define VM_MAYWRITE 0x00000020
210 #define VM_MAYEXEC 0x00000040
211 #define VM_MAYSHARE 0x00000080
213 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
214 #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
215 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
216 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
217 #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
219 #define VM_LOCKED 0x00002000
220 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
222 /* Used by sys_madvise() */
223 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
224 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
226 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
227 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
228 #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
229 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
230 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
231 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
232 #define VM_SYNC 0x00800000 /* Synchronous page faults */
233 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
234 #define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */
235 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
237 #ifdef CONFIG_MEM_SOFT_DIRTY
238 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
240 # define VM_SOFTDIRTY 0
243 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
244 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
245 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
246 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
248 #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
249 #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */
250 #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */
251 #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */
252 #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */
253 #define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */
254 #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0)
255 #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1)
256 #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2)
257 #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3)
258 #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4)
259 #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
261 #ifdef CONFIG_ARCH_HAS_PKEYS
262 # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0
263 # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */
264 # define VM_PKEY_BIT1 VM_HIGH_ARCH_1 /* on x86 and 5-bit value on ppc64 */
265 # define VM_PKEY_BIT2 VM_HIGH_ARCH_2
266 # define VM_PKEY_BIT3 VM_HIGH_ARCH_3
268 # define VM_PKEY_BIT4 VM_HIGH_ARCH_4
270 # define VM_PKEY_BIT4 0
272 #endif /* CONFIG_ARCH_HAS_PKEYS */
274 #if defined(CONFIG_X86)
275 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
276 #elif defined(CONFIG_PPC)
277 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
278 #elif defined(CONFIG_PARISC)
279 # define VM_GROWSUP VM_ARCH_1
280 #elif defined(CONFIG_IA64)
281 # define VM_GROWSUP VM_ARCH_1
282 #elif defined(CONFIG_SPARC64)
283 # define VM_SPARC_ADI VM_ARCH_1 /* Uses ADI tag for access control */
284 # define VM_ARCH_CLEAR VM_SPARC_ADI
285 #elif !defined(CONFIG_MMU)
286 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
289 #if defined(CONFIG_X86_INTEL_MPX)
290 /* MPX specific bounds table or bounds directory */
291 # define VM_MPX VM_HIGH_ARCH_4
293 # define VM_MPX VM_NONE
297 # define VM_GROWSUP VM_NONE
300 /* Bits set in the VMA until the stack is in its final location */
301 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
303 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
304 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
307 #ifdef CONFIG_STACK_GROWSUP
308 #define VM_STACK VM_GROWSUP
310 #define VM_STACK VM_GROWSDOWN
313 #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
316 * Special vmas that are non-mergable, non-mlock()able.
317 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
319 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
321 /* This mask defines which mm->def_flags a process can inherit its parent */
322 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
324 /* This mask is used to clear all the VMA flags used by mlock */
325 #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
327 /* Arch-specific flags to clear when updating VM flags on protection change */
328 #ifndef VM_ARCH_CLEAR
329 # define VM_ARCH_CLEAR VM_NONE
331 #define VM_FLAGS_CLEAR (ARCH_VM_PKEY_FLAGS | VM_ARCH_CLEAR)
334 * mapping from the currently active vm_flags protection bits (the
335 * low four bits) to a page protection mask..
337 extern pgprot_t protection_map
[16];
339 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
340 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
341 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
342 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
343 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
344 #define FAULT_FLAG_TRIED 0x20 /* Second try */
345 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
346 #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */
347 #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */
349 #define FAULT_FLAG_TRACE \
350 { FAULT_FLAG_WRITE, "WRITE" }, \
351 { FAULT_FLAG_MKWRITE, "MKWRITE" }, \
352 { FAULT_FLAG_ALLOW_RETRY, "ALLOW_RETRY" }, \
353 { FAULT_FLAG_RETRY_NOWAIT, "RETRY_NOWAIT" }, \
354 { FAULT_FLAG_KILLABLE, "KILLABLE" }, \
355 { FAULT_FLAG_TRIED, "TRIED" }, \
356 { FAULT_FLAG_USER, "USER" }, \
357 { FAULT_FLAG_REMOTE, "REMOTE" }, \
358 { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" }
361 * vm_fault is filled by the the pagefault handler and passed to the vma's
362 * ->fault function. The vma's ->fault is responsible for returning a bitmask
363 * of VM_FAULT_xxx flags that give details about how the fault was handled.
365 * MM layer fills up gfp_mask for page allocations but fault handler might
366 * alter it if its implementation requires a different allocation context.
368 * pgoff should be used in favour of virtual_address, if possible.
371 struct vm_area_struct
*vma
; /* Target VMA */
372 unsigned int flags
; /* FAULT_FLAG_xxx flags */
373 gfp_t gfp_mask
; /* gfp mask to be used for allocations */
374 pgoff_t pgoff
; /* Logical page offset based on vma */
375 unsigned long address
; /* Faulting virtual address */
376 pmd_t
*pmd
; /* Pointer to pmd entry matching
378 pud_t
*pud
; /* Pointer to pud entry matching
381 pte_t orig_pte
; /* Value of PTE at the time of fault */
383 struct page
*cow_page
; /* Page handler may use for COW fault */
384 struct mem_cgroup
*memcg
; /* Cgroup cow_page belongs to */
385 struct page
*page
; /* ->fault handlers should return a
386 * page here, unless VM_FAULT_NOPAGE
387 * is set (which is also implied by
390 /* These three entries are valid only while holding ptl lock */
391 pte_t
*pte
; /* Pointer to pte entry matching
392 * the 'address'. NULL if the page
393 * table hasn't been allocated.
395 spinlock_t
*ptl
; /* Page table lock.
396 * Protects pte page table if 'pte'
397 * is not NULL, otherwise pmd.
399 pgtable_t prealloc_pte
; /* Pre-allocated pte page table.
400 * vm_ops->map_pages() calls
401 * alloc_set_pte() from atomic context.
402 * do_fault_around() pre-allocates
403 * page table to avoid allocation from
408 /* page entry size for vm->huge_fault() */
409 enum page_entry_size
{
416 * These are the virtual MM functions - opening of an area, closing and
417 * unmapping it (needed to keep files on disk up-to-date etc), pointer
418 * to the functions called when a no-page or a wp-page exception occurs.
420 struct vm_operations_struct
{
421 void (*open
)(struct vm_area_struct
* area
);
422 void (*close
)(struct vm_area_struct
* area
);
423 int (*split
)(struct vm_area_struct
* area
, unsigned long addr
);
424 int (*mremap
)(struct vm_area_struct
* area
);
425 vm_fault_t (*fault
)(struct vm_fault
*vmf
);
426 vm_fault_t (*huge_fault
)(struct vm_fault
*vmf
,
427 enum page_entry_size pe_size
);
428 void (*map_pages
)(struct vm_fault
*vmf
,
429 pgoff_t start_pgoff
, pgoff_t end_pgoff
);
430 unsigned long (*pagesize
)(struct vm_area_struct
* area
);
432 /* notification that a previously read-only page is about to become
433 * writable, if an error is returned it will cause a SIGBUS */
434 vm_fault_t (*page_mkwrite
)(struct vm_fault
*vmf
);
436 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
437 vm_fault_t (*pfn_mkwrite
)(struct vm_fault
*vmf
);
439 /* called by access_process_vm when get_user_pages() fails, typically
440 * for use by special VMAs that can switch between memory and hardware
442 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
443 void *buf
, int len
, int write
);
445 /* Called by the /proc/PID/maps code to ask the vma whether it
446 * has a special name. Returning non-NULL will also cause this
447 * vma to be dumped unconditionally. */
448 const char *(*name
)(struct vm_area_struct
*vma
);
452 * set_policy() op must add a reference to any non-NULL @new mempolicy
453 * to hold the policy upon return. Caller should pass NULL @new to
454 * remove a policy and fall back to surrounding context--i.e. do not
455 * install a MPOL_DEFAULT policy, nor the task or system default
458 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
461 * get_policy() op must add reference [mpol_get()] to any policy at
462 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
463 * in mm/mempolicy.c will do this automatically.
464 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
465 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
466 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
467 * must return NULL--i.e., do not "fallback" to task or system default
470 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
474 * Called by vm_normal_page() for special PTEs to find the
475 * page for @addr. This is useful if the default behavior
476 * (using pte_page()) would not find the correct page.
478 struct page
*(*find_special_page
)(struct vm_area_struct
*vma
,
482 static inline void vma_init(struct vm_area_struct
*vma
, struct mm_struct
*mm
)
484 static const struct vm_operations_struct dummy_vm_ops
= {};
486 memset(vma
, 0, sizeof(*vma
));
488 vma
->vm_ops
= &dummy_vm_ops
;
489 INIT_LIST_HEAD(&vma
->anon_vma_chain
);
492 static inline void vma_set_anonymous(struct vm_area_struct
*vma
)
497 /* flush_tlb_range() takes a vma, not a mm, and can care about flags */
498 #define TLB_FLUSH_VMA(mm,flags) { .vm_mm = (mm), .vm_flags = (flags) }
503 #define page_private(page) ((page)->private)
504 #define set_page_private(page, v) ((page)->private = (v))
506 #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
507 static inline int pmd_devmap(pmd_t pmd
)
511 static inline int pud_devmap(pud_t pud
)
515 static inline int pgd_devmap(pgd_t pgd
)
522 * FIXME: take this include out, include page-flags.h in
523 * files which need it (119 of them)
525 #include <linux/page-flags.h>
526 #include <linux/huge_mm.h>
529 * Methods to modify the page usage count.
531 * What counts for a page usage:
532 * - cache mapping (page->mapping)
533 * - private data (page->private)
534 * - page mapped in a task's page tables, each mapping
535 * is counted separately
537 * Also, many kernel routines increase the page count before a critical
538 * routine so they can be sure the page doesn't go away from under them.
542 * Drop a ref, return true if the refcount fell to zero (the page has no users)
544 static inline int put_page_testzero(struct page
*page
)
546 VM_BUG_ON_PAGE(page_ref_count(page
) == 0, page
);
547 return page_ref_dec_and_test(page
);
551 * Try to grab a ref unless the page has a refcount of zero, return false if
553 * This can be called when MMU is off so it must not access
554 * any of the virtual mappings.
556 static inline int get_page_unless_zero(struct page
*page
)
558 return page_ref_add_unless(page
, 1, 0);
561 extern int page_is_ram(unsigned long pfn
);
569 int region_intersects(resource_size_t offset
, size_t size
, unsigned long flags
,
572 /* Support for virtually mapped pages */
573 struct page
*vmalloc_to_page(const void *addr
);
574 unsigned long vmalloc_to_pfn(const void *addr
);
577 * Determine if an address is within the vmalloc range
579 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
580 * is no special casing required.
582 static inline bool is_vmalloc_addr(const void *x
)
585 unsigned long addr
= (unsigned long)x
;
587 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
593 extern int is_vmalloc_or_module_addr(const void *x
);
595 static inline int is_vmalloc_or_module_addr(const void *x
)
601 extern void *kvmalloc_node(size_t size
, gfp_t flags
, int node
);
602 static inline void *kvmalloc(size_t size
, gfp_t flags
)
604 return kvmalloc_node(size
, flags
, NUMA_NO_NODE
);
606 static inline void *kvzalloc_node(size_t size
, gfp_t flags
, int node
)
608 return kvmalloc_node(size
, flags
| __GFP_ZERO
, node
);
610 static inline void *kvzalloc(size_t size
, gfp_t flags
)
612 return kvmalloc(size
, flags
| __GFP_ZERO
);
615 static inline void *kvmalloc_array(size_t n
, size_t size
, gfp_t flags
)
619 if (unlikely(check_mul_overflow(n
, size
, &bytes
)))
622 return kvmalloc(bytes
, flags
);
625 static inline void *kvcalloc(size_t n
, size_t size
, gfp_t flags
)
627 return kvmalloc_array(n
, size
, flags
| __GFP_ZERO
);
630 extern void kvfree(const void *addr
);
632 static inline atomic_t
*compound_mapcount_ptr(struct page
*page
)
634 return &page
[1].compound_mapcount
;
637 static inline int compound_mapcount(struct page
*page
)
639 VM_BUG_ON_PAGE(!PageCompound(page
), page
);
640 page
= compound_head(page
);
641 return atomic_read(compound_mapcount_ptr(page
)) + 1;
645 * The atomic page->_mapcount, starts from -1: so that transitions
646 * both from it and to it can be tracked, using atomic_inc_and_test
647 * and atomic_add_negative(-1).
649 static inline void page_mapcount_reset(struct page
*page
)
651 atomic_set(&(page
)->_mapcount
, -1);
654 int __page_mapcount(struct page
*page
);
656 static inline int page_mapcount(struct page
*page
)
658 VM_BUG_ON_PAGE(PageSlab(page
), page
);
660 if (unlikely(PageCompound(page
)))
661 return __page_mapcount(page
);
662 return atomic_read(&page
->_mapcount
) + 1;
665 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
666 int total_mapcount(struct page
*page
);
667 int page_trans_huge_mapcount(struct page
*page
, int *total_mapcount
);
669 static inline int total_mapcount(struct page
*page
)
671 return page_mapcount(page
);
673 static inline int page_trans_huge_mapcount(struct page
*page
,
676 int mapcount
= page_mapcount(page
);
678 *total_mapcount
= mapcount
;
683 static inline struct page
*virt_to_head_page(const void *x
)
685 struct page
*page
= virt_to_page(x
);
687 return compound_head(page
);
690 void __put_page(struct page
*page
);
692 void put_pages_list(struct list_head
*pages
);
694 void split_page(struct page
*page
, unsigned int order
);
697 * Compound pages have a destructor function. Provide a
698 * prototype for that function and accessor functions.
699 * These are _only_ valid on the head of a compound page.
701 typedef void compound_page_dtor(struct page
*);
703 /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
704 enum compound_dtor_id
{
707 #ifdef CONFIG_HUGETLB_PAGE
710 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
715 extern compound_page_dtor
* const compound_page_dtors
[];
717 static inline void set_compound_page_dtor(struct page
*page
,
718 enum compound_dtor_id compound_dtor
)
720 VM_BUG_ON_PAGE(compound_dtor
>= NR_COMPOUND_DTORS
, page
);
721 page
[1].compound_dtor
= compound_dtor
;
724 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
726 VM_BUG_ON_PAGE(page
[1].compound_dtor
>= NR_COMPOUND_DTORS
, page
);
727 return compound_page_dtors
[page
[1].compound_dtor
];
730 static inline unsigned int compound_order(struct page
*page
)
734 return page
[1].compound_order
;
737 static inline void set_compound_order(struct page
*page
, unsigned int order
)
739 page
[1].compound_order
= order
;
742 void free_compound_page(struct page
*page
);
746 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
747 * servicing faults for write access. In the normal case, do always want
748 * pte_mkwrite. But get_user_pages can cause write faults for mappings
749 * that do not have writing enabled, when used by access_process_vm.
751 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
753 if (likely(vma
->vm_flags
& VM_WRITE
))
754 pte
= pte_mkwrite(pte
);
758 vm_fault_t
alloc_set_pte(struct vm_fault
*vmf
, struct mem_cgroup
*memcg
,
760 vm_fault_t
finish_fault(struct vm_fault
*vmf
);
761 vm_fault_t
finish_mkwrite_fault(struct vm_fault
*vmf
);
765 * Multiple processes may "see" the same page. E.g. for untouched
766 * mappings of /dev/null, all processes see the same page full of
767 * zeroes, and text pages of executables and shared libraries have
768 * only one copy in memory, at most, normally.
770 * For the non-reserved pages, page_count(page) denotes a reference count.
771 * page_count() == 0 means the page is free. page->lru is then used for
772 * freelist management in the buddy allocator.
773 * page_count() > 0 means the page has been allocated.
775 * Pages are allocated by the slab allocator in order to provide memory
776 * to kmalloc and kmem_cache_alloc. In this case, the management of the
777 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
778 * unless a particular usage is carefully commented. (the responsibility of
779 * freeing the kmalloc memory is the caller's, of course).
781 * A page may be used by anyone else who does a __get_free_page().
782 * In this case, page_count still tracks the references, and should only
783 * be used through the normal accessor functions. The top bits of page->flags
784 * and page->virtual store page management information, but all other fields
785 * are unused and could be used privately, carefully. The management of this
786 * page is the responsibility of the one who allocated it, and those who have
787 * subsequently been given references to it.
789 * The other pages (we may call them "pagecache pages") are completely
790 * managed by the Linux memory manager: I/O, buffers, swapping etc.
791 * The following discussion applies only to them.
793 * A pagecache page contains an opaque `private' member, which belongs to the
794 * page's address_space. Usually, this is the address of a circular list of
795 * the page's disk buffers. PG_private must be set to tell the VM to call
796 * into the filesystem to release these pages.
798 * A page may belong to an inode's memory mapping. In this case, page->mapping
799 * is the pointer to the inode, and page->index is the file offset of the page,
800 * in units of PAGE_SIZE.
802 * If pagecache pages are not associated with an inode, they are said to be
803 * anonymous pages. These may become associated with the swapcache, and in that
804 * case PG_swapcache is set, and page->private is an offset into the swapcache.
806 * In either case (swapcache or inode backed), the pagecache itself holds one
807 * reference to the page. Setting PG_private should also increment the
808 * refcount. The each user mapping also has a reference to the page.
810 * The pagecache pages are stored in a per-mapping radix tree, which is
811 * rooted at mapping->i_pages, and indexed by offset.
812 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
813 * lists, we instead now tag pages as dirty/writeback in the radix tree.
815 * All pagecache pages may be subject to I/O:
816 * - inode pages may need to be read from disk,
817 * - inode pages which have been modified and are MAP_SHARED may need
818 * to be written back to the inode on disk,
819 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
820 * modified may need to be swapped out to swap space and (later) to be read
825 * The zone field is never updated after free_area_init_core()
826 * sets it, so none of the operations on it need to be atomic.
829 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
830 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
831 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
832 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
833 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
834 #define KASAN_TAG_PGOFF (LAST_CPUPID_PGOFF - KASAN_TAG_WIDTH)
837 * Define the bit shifts to access each section. For non-existent
838 * sections we define the shift as 0; that plus a 0 mask ensures
839 * the compiler will optimise away reference to them.
841 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
842 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
843 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
844 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
845 #define KASAN_TAG_PGSHIFT (KASAN_TAG_PGOFF * (KASAN_TAG_WIDTH != 0))
847 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
848 #ifdef NODE_NOT_IN_PAGE_FLAGS
849 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
850 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
851 SECTIONS_PGOFF : ZONES_PGOFF)
853 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
854 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
855 NODES_PGOFF : ZONES_PGOFF)
858 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
860 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
861 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
864 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
865 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
866 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
867 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
868 #define KASAN_TAG_MASK ((1UL << KASAN_TAG_WIDTH) - 1)
869 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
871 static inline enum zone_type
page_zonenum(const struct page
*page
)
873 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
876 #ifdef CONFIG_ZONE_DEVICE
877 static inline bool is_zone_device_page(const struct page
*page
)
879 return page_zonenum(page
) == ZONE_DEVICE
;
881 extern void memmap_init_zone_device(struct zone
*, unsigned long,
882 unsigned long, struct dev_pagemap
*);
884 static inline bool is_zone_device_page(const struct page
*page
)
890 #ifdef CONFIG_DEV_PAGEMAP_OPS
891 void dev_pagemap_get_ops(void);
892 void dev_pagemap_put_ops(void);
893 void __put_devmap_managed_page(struct page
*page
);
894 DECLARE_STATIC_KEY_FALSE(devmap_managed_key
);
895 static inline bool put_devmap_managed_page(struct page
*page
)
897 if (!static_branch_unlikely(&devmap_managed_key
))
899 if (!is_zone_device_page(page
))
901 switch (page
->pgmap
->type
) {
902 case MEMORY_DEVICE_PRIVATE
:
903 case MEMORY_DEVICE_PUBLIC
:
904 case MEMORY_DEVICE_FS_DAX
:
905 __put_devmap_managed_page(page
);
913 static inline bool is_device_private_page(const struct page
*page
)
915 return is_zone_device_page(page
) &&
916 page
->pgmap
->type
== MEMORY_DEVICE_PRIVATE
;
919 static inline bool is_device_public_page(const struct page
*page
)
921 return is_zone_device_page(page
) &&
922 page
->pgmap
->type
== MEMORY_DEVICE_PUBLIC
;
925 #ifdef CONFIG_PCI_P2PDMA
926 static inline bool is_pci_p2pdma_page(const struct page
*page
)
928 return is_zone_device_page(page
) &&
929 page
->pgmap
->type
== MEMORY_DEVICE_PCI_P2PDMA
;
931 #else /* CONFIG_PCI_P2PDMA */
932 static inline bool is_pci_p2pdma_page(const struct page
*page
)
936 #endif /* CONFIG_PCI_P2PDMA */
938 #else /* CONFIG_DEV_PAGEMAP_OPS */
939 static inline void dev_pagemap_get_ops(void)
943 static inline void dev_pagemap_put_ops(void)
947 static inline bool put_devmap_managed_page(struct page
*page
)
952 static inline bool is_device_private_page(const struct page
*page
)
957 static inline bool is_device_public_page(const struct page
*page
)
962 static inline bool is_pci_p2pdma_page(const struct page
*page
)
966 #endif /* CONFIG_DEV_PAGEMAP_OPS */
968 /* 127: arbitrary random number, small enough to assemble well */
969 #define page_ref_zero_or_close_to_overflow(page) \
970 ((unsigned int) page_ref_count(page) + 127u <= 127u)
972 static inline void get_page(struct page
*page
)
974 page
= compound_head(page
);
976 * Getting a normal page or the head of a compound page
977 * requires to already have an elevated page->_refcount.
979 VM_BUG_ON_PAGE(page_ref_zero_or_close_to_overflow(page
), page
);
983 static inline void put_page(struct page
*page
)
985 page
= compound_head(page
);
988 * For devmap managed pages we need to catch refcount transition from
989 * 2 to 1, when refcount reach one it means the page is free and we
990 * need to inform the device driver through callback. See
991 * include/linux/memremap.h and HMM for details.
993 if (put_devmap_managed_page(page
))
996 if (put_page_testzero(page
))
1000 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
1001 #define SECTION_IN_PAGE_FLAGS
1005 * The identification function is mainly used by the buddy allocator for
1006 * determining if two pages could be buddies. We are not really identifying
1007 * the zone since we could be using the section number id if we do not have
1008 * node id available in page flags.
1009 * We only guarantee that it will return the same value for two combinable
1012 static inline int page_zone_id(struct page
*page
)
1014 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
1017 #ifdef NODE_NOT_IN_PAGE_FLAGS
1018 extern int page_to_nid(const struct page
*page
);
1020 static inline int page_to_nid(const struct page
*page
)
1022 struct page
*p
= (struct page
*)page
;
1024 return (PF_POISONED_CHECK(p
)->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
1028 #ifdef CONFIG_NUMA_BALANCING
1029 static inline int cpu_pid_to_cpupid(int cpu
, int pid
)
1031 return ((cpu
& LAST__CPU_MASK
) << LAST__PID_SHIFT
) | (pid
& LAST__PID_MASK
);
1034 static inline int cpupid_to_pid(int cpupid
)
1036 return cpupid
& LAST__PID_MASK
;
1039 static inline int cpupid_to_cpu(int cpupid
)
1041 return (cpupid
>> LAST__PID_SHIFT
) & LAST__CPU_MASK
;
1044 static inline int cpupid_to_nid(int cpupid
)
1046 return cpu_to_node(cpupid_to_cpu(cpupid
));
1049 static inline bool cpupid_pid_unset(int cpupid
)
1051 return cpupid_to_pid(cpupid
) == (-1 & LAST__PID_MASK
);
1054 static inline bool cpupid_cpu_unset(int cpupid
)
1056 return cpupid_to_cpu(cpupid
) == (-1 & LAST__CPU_MASK
);
1059 static inline bool __cpupid_match_pid(pid_t task_pid
, int cpupid
)
1061 return (task_pid
& LAST__PID_MASK
) == cpupid_to_pid(cpupid
);
1064 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
1065 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
1066 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
1068 return xchg(&page
->_last_cpupid
, cpupid
& LAST_CPUPID_MASK
);
1071 static inline int page_cpupid_last(struct page
*page
)
1073 return page
->_last_cpupid
;
1075 static inline void page_cpupid_reset_last(struct page
*page
)
1077 page
->_last_cpupid
= -1 & LAST_CPUPID_MASK
;
1080 static inline int page_cpupid_last(struct page
*page
)
1082 return (page
->flags
>> LAST_CPUPID_PGSHIFT
) & LAST_CPUPID_MASK
;
1085 extern int page_cpupid_xchg_last(struct page
*page
, int cpupid
);
1087 static inline void page_cpupid_reset_last(struct page
*page
)
1089 page
->flags
|= LAST_CPUPID_MASK
<< LAST_CPUPID_PGSHIFT
;
1091 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
1092 #else /* !CONFIG_NUMA_BALANCING */
1093 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
1095 return page_to_nid(page
); /* XXX */
1098 static inline int page_cpupid_last(struct page
*page
)
1100 return page_to_nid(page
); /* XXX */
1103 static inline int cpupid_to_nid(int cpupid
)
1108 static inline int cpupid_to_pid(int cpupid
)
1113 static inline int cpupid_to_cpu(int cpupid
)
1118 static inline int cpu_pid_to_cpupid(int nid
, int pid
)
1123 static inline bool cpupid_pid_unset(int cpupid
)
1128 static inline void page_cpupid_reset_last(struct page
*page
)
1132 static inline bool cpupid_match_pid(struct task_struct
*task
, int cpupid
)
1136 #endif /* CONFIG_NUMA_BALANCING */
1138 #ifdef CONFIG_KASAN_SW_TAGS
1139 static inline u8
page_kasan_tag(const struct page
*page
)
1141 return (page
->flags
>> KASAN_TAG_PGSHIFT
) & KASAN_TAG_MASK
;
1144 static inline void page_kasan_tag_set(struct page
*page
, u8 tag
)
1146 page
->flags
&= ~(KASAN_TAG_MASK
<< KASAN_TAG_PGSHIFT
);
1147 page
->flags
|= (tag
& KASAN_TAG_MASK
) << KASAN_TAG_PGSHIFT
;
1150 static inline void page_kasan_tag_reset(struct page
*page
)
1152 page_kasan_tag_set(page
, 0xff);
1155 static inline u8
page_kasan_tag(const struct page
*page
)
1160 static inline void page_kasan_tag_set(struct page
*page
, u8 tag
) { }
1161 static inline void page_kasan_tag_reset(struct page
*page
) { }
1164 static inline struct zone
*page_zone(const struct page
*page
)
1166 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
1169 static inline pg_data_t
*page_pgdat(const struct page
*page
)
1171 return NODE_DATA(page_to_nid(page
));
1174 #ifdef SECTION_IN_PAGE_FLAGS
1175 static inline void set_page_section(struct page
*page
, unsigned long section
)
1177 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
1178 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
1181 static inline unsigned long page_to_section(const struct page
*page
)
1183 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
1187 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
1189 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
1190 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
1193 static inline void set_page_node(struct page
*page
, unsigned long node
)
1195 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
1196 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
1199 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
1200 unsigned long node
, unsigned long pfn
)
1202 set_page_zone(page
, zone
);
1203 set_page_node(page
, node
);
1204 #ifdef SECTION_IN_PAGE_FLAGS
1205 set_page_section(page
, pfn_to_section_nr(pfn
));
1210 static inline struct mem_cgroup
*page_memcg(struct page
*page
)
1212 return page
->mem_cgroup
;
1214 static inline struct mem_cgroup
*page_memcg_rcu(struct page
*page
)
1216 WARN_ON_ONCE(!rcu_read_lock_held());
1217 return READ_ONCE(page
->mem_cgroup
);
1220 static inline struct mem_cgroup
*page_memcg(struct page
*page
)
1224 static inline struct mem_cgroup
*page_memcg_rcu(struct page
*page
)
1226 WARN_ON_ONCE(!rcu_read_lock_held());
1232 * Some inline functions in vmstat.h depend on page_zone()
1234 #include <linux/vmstat.h>
1236 static __always_inline
void *lowmem_page_address(const struct page
*page
)
1238 return page_to_virt(page
);
1241 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
1242 #define HASHED_PAGE_VIRTUAL
1245 #if defined(WANT_PAGE_VIRTUAL)
1246 static inline void *page_address(const struct page
*page
)
1248 return page
->virtual;
1250 static inline void set_page_address(struct page
*page
, void *address
)
1252 page
->virtual = address
;
1254 #define page_address_init() do { } while(0)
1257 #if defined(HASHED_PAGE_VIRTUAL)
1258 void *page_address(const struct page
*page
);
1259 void set_page_address(struct page
*page
, void *virtual);
1260 void page_address_init(void);
1263 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
1264 #define page_address(page) lowmem_page_address(page)
1265 #define set_page_address(page, address) do { } while(0)
1266 #define page_address_init() do { } while(0)
1269 extern void *page_rmapping(struct page
*page
);
1270 extern struct anon_vma
*page_anon_vma(struct page
*page
);
1271 extern struct address_space
*page_mapping(struct page
*page
);
1273 extern struct address_space
*__page_file_mapping(struct page
*);
1276 struct address_space
*page_file_mapping(struct page
*page
)
1278 if (unlikely(PageSwapCache(page
)))
1279 return __page_file_mapping(page
);
1281 return page
->mapping
;
1284 extern pgoff_t
__page_file_index(struct page
*page
);
1287 * Return the pagecache index of the passed page. Regular pagecache pages
1288 * use ->index whereas swapcache pages use swp_offset(->private)
1290 static inline pgoff_t
page_index(struct page
*page
)
1292 if (unlikely(PageSwapCache(page
)))
1293 return __page_file_index(page
);
1297 bool page_mapped(struct page
*page
);
1298 struct address_space
*page_mapping(struct page
*page
);
1299 struct address_space
*page_mapping_file(struct page
*page
);
1302 * Return true only if the page has been allocated with
1303 * ALLOC_NO_WATERMARKS and the low watermark was not
1304 * met implying that the system is under some pressure.
1306 static inline bool page_is_pfmemalloc(struct page
*page
)
1309 * Page index cannot be this large so this must be
1310 * a pfmemalloc page.
1312 return page
->index
== -1UL;
1316 * Only to be called by the page allocator on a freshly allocated
1319 static inline void set_page_pfmemalloc(struct page
*page
)
1324 static inline void clear_page_pfmemalloc(struct page
*page
)
1330 * Different kinds of faults, as returned by handle_mm_fault().
1331 * Used to decide whether a process gets delivered SIGBUS or
1332 * just gets major/minor fault counters bumped up.
1335 #define VM_FAULT_OOM 0x0001
1336 #define VM_FAULT_SIGBUS 0x0002
1337 #define VM_FAULT_MAJOR 0x0004
1338 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1339 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1340 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1341 #define VM_FAULT_SIGSEGV 0x0040
1343 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1344 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1345 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1346 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1347 #define VM_FAULT_DONE_COW 0x1000 /* ->fault has fully handled COW */
1348 #define VM_FAULT_NEEDDSYNC 0x2000 /* ->fault did not modify page tables
1349 * and needs fsync() to complete (for
1350 * synchronous page faults in DAX) */
1352 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1353 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1356 #define VM_FAULT_RESULT_TRACE \
1357 { VM_FAULT_OOM, "OOM" }, \
1358 { VM_FAULT_SIGBUS, "SIGBUS" }, \
1359 { VM_FAULT_MAJOR, "MAJOR" }, \
1360 { VM_FAULT_WRITE, "WRITE" }, \
1361 { VM_FAULT_HWPOISON, "HWPOISON" }, \
1362 { VM_FAULT_HWPOISON_LARGE, "HWPOISON_LARGE" }, \
1363 { VM_FAULT_SIGSEGV, "SIGSEGV" }, \
1364 { VM_FAULT_NOPAGE, "NOPAGE" }, \
1365 { VM_FAULT_LOCKED, "LOCKED" }, \
1366 { VM_FAULT_RETRY, "RETRY" }, \
1367 { VM_FAULT_FALLBACK, "FALLBACK" }, \
1368 { VM_FAULT_DONE_COW, "DONE_COW" }, \
1369 { VM_FAULT_NEEDDSYNC, "NEEDDSYNC" }
1371 /* Encode hstate index for a hwpoisoned large page */
1372 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1373 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1376 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1378 extern void pagefault_out_of_memory(void);
1380 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1383 * Flags passed to show_mem() and show_free_areas() to suppress output in
1386 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1388 extern void show_free_areas(unsigned int flags
, nodemask_t
*nodemask
);
1390 extern bool can_do_mlock(void);
1391 extern int user_shm_lock(size_t, struct user_struct
*);
1392 extern void user_shm_unlock(size_t, struct user_struct
*);
1395 * Parameter block passed down to zap_pte_range in exceptional cases.
1397 struct zap_details
{
1398 struct address_space
*check_mapping
; /* Check page->mapping if set */
1399 pgoff_t first_index
; /* Lowest page->index to unmap */
1400 pgoff_t last_index
; /* Highest page->index to unmap */
1403 struct page
*_vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
1404 pte_t pte
, bool with_public_device
);
1405 #define vm_normal_page(vma, addr, pte) _vm_normal_page(vma, addr, pte, false)
1407 struct page
*vm_normal_page_pmd(struct vm_area_struct
*vma
, unsigned long addr
,
1410 void zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
1411 unsigned long size
);
1412 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
1413 unsigned long size
);
1414 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
1415 unsigned long start
, unsigned long end
);
1418 * mm_walk - callbacks for walk_page_range
1419 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1420 * this handler should only handle pud_trans_huge() puds.
1421 * the pmd_entry or pte_entry callbacks will be used for
1423 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1424 * this handler is required to be able to handle
1425 * pmd_trans_huge() pmds. They may simply choose to
1426 * split_huge_page() instead of handling it explicitly.
1427 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1428 * @pte_hole: if set, called for each hole at all levels
1429 * @hugetlb_entry: if set, called for each hugetlb entry
1430 * @test_walk: caller specific callback function to determine whether
1431 * we walk over the current vma or not. Returning 0
1432 * value means "do page table walk over the current vma,"
1433 * and a negative one means "abort current page table walk
1434 * right now." 1 means "skip the current vma."
1435 * @mm: mm_struct representing the target process of page table walk
1436 * @vma: vma currently walked (NULL if walking outside vmas)
1437 * @private: private data for callbacks' usage
1439 * (see the comment on walk_page_range() for more details)
1442 int (*pud_entry
)(pud_t
*pud
, unsigned long addr
,
1443 unsigned long next
, struct mm_walk
*walk
);
1444 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
1445 unsigned long next
, struct mm_walk
*walk
);
1446 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
1447 unsigned long next
, struct mm_walk
*walk
);
1448 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
1449 struct mm_walk
*walk
);
1450 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
1451 unsigned long addr
, unsigned long next
,
1452 struct mm_walk
*walk
);
1453 int (*test_walk
)(unsigned long addr
, unsigned long next
,
1454 struct mm_walk
*walk
);
1455 struct mm_struct
*mm
;
1456 struct vm_area_struct
*vma
;
1460 struct mmu_notifier_range
;
1462 int walk_page_range(unsigned long addr
, unsigned long end
,
1463 struct mm_walk
*walk
);
1464 int walk_page_vma(struct vm_area_struct
*vma
, struct mm_walk
*walk
);
1465 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1466 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1467 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1468 struct vm_area_struct
*vma
);
1469 int follow_pte_pmd(struct mm_struct
*mm
, unsigned long address
,
1470 struct mmu_notifier_range
*range
,
1471 pte_t
**ptepp
, pmd_t
**pmdpp
, spinlock_t
**ptlp
);
1472 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1473 unsigned long *pfn
);
1474 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1475 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1476 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1477 void *buf
, int len
, int write
);
1479 extern void truncate_pagecache(struct inode
*inode
, loff_t
new);
1480 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1481 void pagecache_isize_extended(struct inode
*inode
, loff_t from
, loff_t to
);
1482 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1483 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1484 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1485 int invalidate_inode_page(struct page
*page
);
1488 extern vm_fault_t
handle_mm_fault(struct vm_area_struct
*vma
,
1489 unsigned long address
, unsigned int flags
);
1490 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1491 unsigned long address
, unsigned int fault_flags
,
1493 void unmap_mapping_pages(struct address_space
*mapping
,
1494 pgoff_t start
, pgoff_t nr
, bool even_cows
);
1495 void unmap_mapping_range(struct address_space
*mapping
,
1496 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1498 static inline vm_fault_t
handle_mm_fault(struct vm_area_struct
*vma
,
1499 unsigned long address
, unsigned int flags
)
1501 /* should never happen if there's no MMU */
1503 return VM_FAULT_SIGBUS
;
1505 static inline int fixup_user_fault(struct task_struct
*tsk
,
1506 struct mm_struct
*mm
, unsigned long address
,
1507 unsigned int fault_flags
, bool *unlocked
)
1509 /* should never happen if there's no MMU */
1513 static inline void unmap_mapping_pages(struct address_space
*mapping
,
1514 pgoff_t start
, pgoff_t nr
, bool even_cows
) { }
1515 static inline void unmap_mapping_range(struct address_space
*mapping
,
1516 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
) { }
1519 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1520 loff_t
const holebegin
, loff_t
const holelen
)
1522 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1525 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
,
1526 void *buf
, int len
, unsigned int gup_flags
);
1527 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1528 void *buf
, int len
, unsigned int gup_flags
);
1529 extern int __access_remote_vm(struct task_struct
*tsk
, struct mm_struct
*mm
,
1530 unsigned long addr
, void *buf
, int len
, unsigned int gup_flags
);
1532 long get_user_pages_remote(struct task_struct
*tsk
, struct mm_struct
*mm
,
1533 unsigned long start
, unsigned long nr_pages
,
1534 unsigned int gup_flags
, struct page
**pages
,
1535 struct vm_area_struct
**vmas
, int *locked
);
1536 long get_user_pages(unsigned long start
, unsigned long nr_pages
,
1537 unsigned int gup_flags
, struct page
**pages
,
1538 struct vm_area_struct
**vmas
);
1539 long get_user_pages_locked(unsigned long start
, unsigned long nr_pages
,
1540 unsigned int gup_flags
, struct page
**pages
, int *locked
);
1541 long get_user_pages_unlocked(unsigned long start
, unsigned long nr_pages
,
1542 struct page
**pages
, unsigned int gup_flags
);
1543 #ifdef CONFIG_FS_DAX
1544 long get_user_pages_longterm(unsigned long start
, unsigned long nr_pages
,
1545 unsigned int gup_flags
, struct page
**pages
,
1546 struct vm_area_struct
**vmas
);
1548 static inline long get_user_pages_longterm(unsigned long start
,
1549 unsigned long nr_pages
, unsigned int gup_flags
,
1550 struct page
**pages
, struct vm_area_struct
**vmas
)
1552 return get_user_pages(start
, nr_pages
, gup_flags
, pages
, vmas
);
1554 #endif /* CONFIG_FS_DAX */
1556 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1557 struct page
**pages
);
1559 /* Container for pinned pfns / pages */
1560 struct frame_vector
{
1561 unsigned int nr_allocated
; /* Number of frames we have space for */
1562 unsigned int nr_frames
; /* Number of frames stored in ptrs array */
1563 bool got_ref
; /* Did we pin pages by getting page ref? */
1564 bool is_pfns
; /* Does array contain pages or pfns? */
1565 void *ptrs
[0]; /* Array of pinned pfns / pages. Use
1566 * pfns_vector_pages() or pfns_vector_pfns()
1570 struct frame_vector
*frame_vector_create(unsigned int nr_frames
);
1571 void frame_vector_destroy(struct frame_vector
*vec
);
1572 int get_vaddr_frames(unsigned long start
, unsigned int nr_pfns
,
1573 unsigned int gup_flags
, struct frame_vector
*vec
);
1574 void put_vaddr_frames(struct frame_vector
*vec
);
1575 int frame_vector_to_pages(struct frame_vector
*vec
);
1576 void frame_vector_to_pfns(struct frame_vector
*vec
);
1578 static inline unsigned int frame_vector_count(struct frame_vector
*vec
)
1580 return vec
->nr_frames
;
1583 static inline struct page
**frame_vector_pages(struct frame_vector
*vec
)
1586 int err
= frame_vector_to_pages(vec
);
1589 return ERR_PTR(err
);
1591 return (struct page
**)(vec
->ptrs
);
1594 static inline unsigned long *frame_vector_pfns(struct frame_vector
*vec
)
1597 frame_vector_to_pfns(vec
);
1598 return (unsigned long *)(vec
->ptrs
);
1602 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1603 struct page
**pages
);
1604 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1605 struct page
*get_dump_page(unsigned long addr
);
1607 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1608 extern void do_invalidatepage(struct page
*page
, unsigned int offset
,
1609 unsigned int length
);
1611 void __set_page_dirty(struct page
*, struct address_space
*, int warn
);
1612 int __set_page_dirty_nobuffers(struct page
*page
);
1613 int __set_page_dirty_no_writeback(struct page
*page
);
1614 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1616 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1617 void account_page_cleaned(struct page
*page
, struct address_space
*mapping
,
1618 struct bdi_writeback
*wb
);
1619 int set_page_dirty(struct page
*page
);
1620 int set_page_dirty_lock(struct page
*page
);
1621 void __cancel_dirty_page(struct page
*page
);
1622 static inline void cancel_dirty_page(struct page
*page
)
1624 /* Avoid atomic ops, locking, etc. when not actually needed. */
1625 if (PageDirty(page
))
1626 __cancel_dirty_page(page
);
1628 int clear_page_dirty_for_io(struct page
*page
);
1630 int get_cmdline(struct task_struct
*task
, char *buffer
, int buflen
);
1632 static inline bool vma_is_anonymous(struct vm_area_struct
*vma
)
1634 return !vma
->vm_ops
;
1639 * The vma_is_shmem is not inline because it is used only by slow
1640 * paths in userfault.
1642 bool vma_is_shmem(struct vm_area_struct
*vma
);
1644 static inline bool vma_is_shmem(struct vm_area_struct
*vma
) { return false; }
1647 int vma_is_stack_for_current(struct vm_area_struct
*vma
);
1649 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1650 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1651 unsigned long new_addr
, unsigned long len
,
1652 bool need_rmap_locks
);
1653 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1654 unsigned long end
, pgprot_t newprot
,
1655 int dirty_accountable
, int prot_numa
);
1656 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1657 struct vm_area_struct
**pprev
, unsigned long start
,
1658 unsigned long end
, unsigned long newflags
);
1661 * doesn't attempt to fault and will return short.
1663 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1664 struct page
**pages
);
1666 * per-process(per-mm_struct) statistics.
1668 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1670 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1672 #ifdef SPLIT_RSS_COUNTING
1674 * counter is updated in asynchronous manner and may go to minus.
1675 * But it's never be expected number for users.
1680 return (unsigned long)val
;
1683 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1685 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1688 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1690 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1693 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1695 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1698 /* Optimized variant when page is already known not to be PageAnon */
1699 static inline int mm_counter_file(struct page
*page
)
1701 if (PageSwapBacked(page
))
1702 return MM_SHMEMPAGES
;
1703 return MM_FILEPAGES
;
1706 static inline int mm_counter(struct page
*page
)
1709 return MM_ANONPAGES
;
1710 return mm_counter_file(page
);
1713 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1715 return get_mm_counter(mm
, MM_FILEPAGES
) +
1716 get_mm_counter(mm
, MM_ANONPAGES
) +
1717 get_mm_counter(mm
, MM_SHMEMPAGES
);
1720 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1722 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1725 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1727 return max(mm
->hiwater_vm
, mm
->total_vm
);
1730 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1732 unsigned long _rss
= get_mm_rss(mm
);
1734 if ((mm
)->hiwater_rss
< _rss
)
1735 (mm
)->hiwater_rss
= _rss
;
1738 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1740 if (mm
->hiwater_vm
< mm
->total_vm
)
1741 mm
->hiwater_vm
= mm
->total_vm
;
1744 static inline void reset_mm_hiwater_rss(struct mm_struct
*mm
)
1746 mm
->hiwater_rss
= get_mm_rss(mm
);
1749 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1750 struct mm_struct
*mm
)
1752 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1754 if (*maxrss
< hiwater_rss
)
1755 *maxrss
= hiwater_rss
;
1758 #if defined(SPLIT_RSS_COUNTING)
1759 void sync_mm_rss(struct mm_struct
*mm
);
1761 static inline void sync_mm_rss(struct mm_struct
*mm
)
1766 #ifndef __HAVE_ARCH_PTE_DEVMAP
1767 static inline int pte_devmap(pte_t pte
)
1773 int vma_wants_writenotify(struct vm_area_struct
*vma
, pgprot_t vm_page_prot
);
1775 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1777 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1781 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1785 #ifdef __PAGETABLE_P4D_FOLDED
1786 static inline int __p4d_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1787 unsigned long address
)
1792 int __p4d_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1795 #if defined(__PAGETABLE_PUD_FOLDED) || !defined(CONFIG_MMU)
1796 static inline int __pud_alloc(struct mm_struct
*mm
, p4d_t
*p4d
,
1797 unsigned long address
)
1801 static inline void mm_inc_nr_puds(struct mm_struct
*mm
) {}
1802 static inline void mm_dec_nr_puds(struct mm_struct
*mm
) {}
1805 int __pud_alloc(struct mm_struct
*mm
, p4d_t
*p4d
, unsigned long address
);
1807 static inline void mm_inc_nr_puds(struct mm_struct
*mm
)
1809 if (mm_pud_folded(mm
))
1811 atomic_long_add(PTRS_PER_PUD
* sizeof(pud_t
), &mm
->pgtables_bytes
);
1814 static inline void mm_dec_nr_puds(struct mm_struct
*mm
)
1816 if (mm_pud_folded(mm
))
1818 atomic_long_sub(PTRS_PER_PUD
* sizeof(pud_t
), &mm
->pgtables_bytes
);
1822 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1823 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1824 unsigned long address
)
1829 static inline void mm_inc_nr_pmds(struct mm_struct
*mm
) {}
1830 static inline void mm_dec_nr_pmds(struct mm_struct
*mm
) {}
1833 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1835 static inline void mm_inc_nr_pmds(struct mm_struct
*mm
)
1837 if (mm_pmd_folded(mm
))
1839 atomic_long_add(PTRS_PER_PMD
* sizeof(pmd_t
), &mm
->pgtables_bytes
);
1842 static inline void mm_dec_nr_pmds(struct mm_struct
*mm
)
1844 if (mm_pmd_folded(mm
))
1846 atomic_long_sub(PTRS_PER_PMD
* sizeof(pmd_t
), &mm
->pgtables_bytes
);
1851 static inline void mm_pgtables_bytes_init(struct mm_struct
*mm
)
1853 atomic_long_set(&mm
->pgtables_bytes
, 0);
1856 static inline unsigned long mm_pgtables_bytes(const struct mm_struct
*mm
)
1858 return atomic_long_read(&mm
->pgtables_bytes
);
1861 static inline void mm_inc_nr_ptes(struct mm_struct
*mm
)
1863 atomic_long_add(PTRS_PER_PTE
* sizeof(pte_t
), &mm
->pgtables_bytes
);
1866 static inline void mm_dec_nr_ptes(struct mm_struct
*mm
)
1868 atomic_long_sub(PTRS_PER_PTE
* sizeof(pte_t
), &mm
->pgtables_bytes
);
1872 static inline void mm_pgtables_bytes_init(struct mm_struct
*mm
) {}
1873 static inline unsigned long mm_pgtables_bytes(const struct mm_struct
*mm
)
1878 static inline void mm_inc_nr_ptes(struct mm_struct
*mm
) {}
1879 static inline void mm_dec_nr_ptes(struct mm_struct
*mm
) {}
1882 int __pte_alloc(struct mm_struct
*mm
, pmd_t
*pmd
);
1883 int __pte_alloc_kernel(pmd_t
*pmd
);
1886 * The following ifdef needed to get the 4level-fixup.h header to work.
1887 * Remove it when 4level-fixup.h has been removed.
1889 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1891 #ifndef __ARCH_HAS_5LEVEL_HACK
1892 static inline p4d_t
*p4d_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1893 unsigned long address
)
1895 return (unlikely(pgd_none(*pgd
)) && __p4d_alloc(mm
, pgd
, address
)) ?
1896 NULL
: p4d_offset(pgd
, address
);
1899 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, p4d_t
*p4d
,
1900 unsigned long address
)
1902 return (unlikely(p4d_none(*p4d
)) && __pud_alloc(mm
, p4d
, address
)) ?
1903 NULL
: pud_offset(p4d
, address
);
1905 #endif /* !__ARCH_HAS_5LEVEL_HACK */
1907 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1909 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1910 NULL
: pmd_offset(pud
, address
);
1912 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1914 #if USE_SPLIT_PTE_PTLOCKS
1915 #if ALLOC_SPLIT_PTLOCKS
1916 void __init
ptlock_cache_init(void);
1917 extern bool ptlock_alloc(struct page
*page
);
1918 extern void ptlock_free(struct page
*page
);
1920 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1924 #else /* ALLOC_SPLIT_PTLOCKS */
1925 static inline void ptlock_cache_init(void)
1929 static inline bool ptlock_alloc(struct page
*page
)
1934 static inline void ptlock_free(struct page
*page
)
1938 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1942 #endif /* ALLOC_SPLIT_PTLOCKS */
1944 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1946 return ptlock_ptr(pmd_page(*pmd
));
1949 static inline bool ptlock_init(struct page
*page
)
1952 * prep_new_page() initialize page->private (and therefore page->ptl)
1953 * with 0. Make sure nobody took it in use in between.
1955 * It can happen if arch try to use slab for page table allocation:
1956 * slab code uses page->slab_cache, which share storage with page->ptl.
1958 VM_BUG_ON_PAGE(*(unsigned long *)&page
->ptl
, page
);
1959 if (!ptlock_alloc(page
))
1961 spin_lock_init(ptlock_ptr(page
));
1965 #else /* !USE_SPLIT_PTE_PTLOCKS */
1967 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1969 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1971 return &mm
->page_table_lock
;
1973 static inline void ptlock_cache_init(void) {}
1974 static inline bool ptlock_init(struct page
*page
) { return true; }
1975 static inline void ptlock_free(struct page
*page
) {}
1976 #endif /* USE_SPLIT_PTE_PTLOCKS */
1978 static inline void pgtable_init(void)
1980 ptlock_cache_init();
1981 pgtable_cache_init();
1984 static inline bool pgtable_page_ctor(struct page
*page
)
1986 if (!ptlock_init(page
))
1988 __SetPageTable(page
);
1989 inc_zone_page_state(page
, NR_PAGETABLE
);
1993 static inline void pgtable_page_dtor(struct page
*page
)
1996 __ClearPageTable(page
);
1997 dec_zone_page_state(page
, NR_PAGETABLE
);
2000 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
2002 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
2003 pte_t *__pte = pte_offset_map(pmd, address); \
2009 #define pte_unmap_unlock(pte, ptl) do { \
2014 #define pte_alloc(mm, pmd) (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd))
2016 #define pte_alloc_map(mm, pmd, address) \
2017 (pte_alloc(mm, pmd) ? NULL : pte_offset_map(pmd, address))
2019 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
2020 (pte_alloc(mm, pmd) ? \
2021 NULL : pte_offset_map_lock(mm, pmd, address, ptlp))
2023 #define pte_alloc_kernel(pmd, address) \
2024 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd))? \
2025 NULL: pte_offset_kernel(pmd, address))
2027 #if USE_SPLIT_PMD_PTLOCKS
2029 static struct page
*pmd_to_page(pmd_t
*pmd
)
2031 unsigned long mask
= ~(PTRS_PER_PMD
* sizeof(pmd_t
) - 1);
2032 return virt_to_page((void *)((unsigned long) pmd
& mask
));
2035 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
2037 return ptlock_ptr(pmd_to_page(pmd
));
2040 static inline bool pgtable_pmd_page_ctor(struct page
*page
)
2042 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
2043 page
->pmd_huge_pte
= NULL
;
2045 return ptlock_init(page
);
2048 static inline void pgtable_pmd_page_dtor(struct page
*page
)
2050 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
2051 VM_BUG_ON_PAGE(page
->pmd_huge_pte
, page
);
2056 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
2060 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
2062 return &mm
->page_table_lock
;
2065 static inline bool pgtable_pmd_page_ctor(struct page
*page
) { return true; }
2066 static inline void pgtable_pmd_page_dtor(struct page
*page
) {}
2068 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
2072 static inline spinlock_t
*pmd_lock(struct mm_struct
*mm
, pmd_t
*pmd
)
2074 spinlock_t
*ptl
= pmd_lockptr(mm
, pmd
);
2080 * No scalability reason to split PUD locks yet, but follow the same pattern
2081 * as the PMD locks to make it easier if we decide to. The VM should not be
2082 * considered ready to switch to split PUD locks yet; there may be places
2083 * which need to be converted from page_table_lock.
2085 static inline spinlock_t
*pud_lockptr(struct mm_struct
*mm
, pud_t
*pud
)
2087 return &mm
->page_table_lock
;
2090 static inline spinlock_t
*pud_lock(struct mm_struct
*mm
, pud_t
*pud
)
2092 spinlock_t
*ptl
= pud_lockptr(mm
, pud
);
2098 extern void __init
pagecache_init(void);
2099 extern void free_area_init(unsigned long * zones_size
);
2100 extern void __init
free_area_init_node(int nid
, unsigned long * zones_size
,
2101 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
2102 extern void free_initmem(void);
2105 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
2106 * into the buddy system. The freed pages will be poisoned with pattern
2107 * "poison" if it's within range [0, UCHAR_MAX].
2108 * Return pages freed into the buddy system.
2110 extern unsigned long free_reserved_area(void *start
, void *end
,
2111 int poison
, const char *s
);
2113 #ifdef CONFIG_HIGHMEM
2115 * Free a highmem page into the buddy system, adjusting totalhigh_pages
2116 * and totalram_pages.
2118 extern void free_highmem_page(struct page
*page
);
2121 extern void adjust_managed_page_count(struct page
*page
, long count
);
2122 extern void mem_init_print_info(const char *str
);
2124 extern void reserve_bootmem_region(phys_addr_t start
, phys_addr_t end
);
2126 /* Free the reserved page into the buddy system, so it gets managed. */
2127 static inline void __free_reserved_page(struct page
*page
)
2129 ClearPageReserved(page
);
2130 init_page_count(page
);
2134 static inline void free_reserved_page(struct page
*page
)
2136 __free_reserved_page(page
);
2137 adjust_managed_page_count(page
, 1);
2140 static inline void mark_page_reserved(struct page
*page
)
2142 SetPageReserved(page
);
2143 adjust_managed_page_count(page
, -1);
2147 * Default method to free all the __init memory into the buddy system.
2148 * The freed pages will be poisoned with pattern "poison" if it's within
2149 * range [0, UCHAR_MAX].
2150 * Return pages freed into the buddy system.
2152 static inline unsigned long free_initmem_default(int poison
)
2154 extern char __init_begin
[], __init_end
[];
2156 return free_reserved_area(&__init_begin
, &__init_end
,
2157 poison
, "unused kernel");
2160 static inline unsigned long get_num_physpages(void)
2163 unsigned long phys_pages
= 0;
2165 for_each_online_node(nid
)
2166 phys_pages
+= node_present_pages(nid
);
2171 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
2173 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
2174 * zones, allocate the backing mem_map and account for memory holes in a more
2175 * architecture independent manner. This is a substitute for creating the
2176 * zone_sizes[] and zholes_size[] arrays and passing them to
2177 * free_area_init_node()
2179 * An architecture is expected to register range of page frames backed by
2180 * physical memory with memblock_add[_node]() before calling
2181 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
2182 * usage, an architecture is expected to do something like
2184 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
2186 * for_each_valid_physical_page_range()
2187 * memblock_add_node(base, size, nid)
2188 * free_area_init_nodes(max_zone_pfns);
2190 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
2191 * registered physical page range. Similarly
2192 * sparse_memory_present_with_active_regions() calls memory_present() for
2193 * each range when SPARSEMEM is enabled.
2195 * See mm/page_alloc.c for more information on each function exposed by
2196 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
2198 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
2199 unsigned long node_map_pfn_alignment(void);
2200 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
2201 unsigned long end_pfn
);
2202 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
2203 unsigned long end_pfn
);
2204 extern void get_pfn_range_for_nid(unsigned int nid
,
2205 unsigned long *start_pfn
, unsigned long *end_pfn
);
2206 extern unsigned long find_min_pfn_with_active_regions(void);
2207 extern void free_bootmem_with_active_regions(int nid
,
2208 unsigned long max_low_pfn
);
2209 extern void sparse_memory_present_with_active_regions(int nid
);
2211 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
2213 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
2214 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
2215 static inline int __early_pfn_to_nid(unsigned long pfn
,
2216 struct mminit_pfnnid_cache
*state
)
2221 /* please see mm/page_alloc.c */
2222 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
2223 /* there is a per-arch backend function. */
2224 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
,
2225 struct mminit_pfnnid_cache
*state
);
2228 #if !defined(CONFIG_FLAT_NODE_MEM_MAP)
2229 void zero_resv_unavail(void);
2231 static inline void zero_resv_unavail(void) {}
2234 extern void set_dma_reserve(unsigned long new_dma_reserve
);
2235 extern void memmap_init_zone(unsigned long, int, unsigned long, unsigned long,
2236 enum memmap_context
, struct vmem_altmap
*);
2237 extern void setup_per_zone_wmarks(void);
2238 extern int __meminit
init_per_zone_wmark_min(void);
2239 extern void mem_init(void);
2240 extern void __init
mmap_init(void);
2241 extern void show_mem(unsigned int flags
, nodemask_t
*nodemask
);
2242 extern long si_mem_available(void);
2243 extern void si_meminfo(struct sysinfo
* val
);
2244 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
2245 #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES
2246 extern unsigned long arch_reserved_kernel_pages(void);
2249 extern __printf(3, 4)
2250 void warn_alloc(gfp_t gfp_mask
, nodemask_t
*nodemask
, const char *fmt
, ...);
2252 extern void setup_per_cpu_pageset(void);
2254 extern void zone_pcp_update(struct zone
*zone
);
2255 extern void zone_pcp_reset(struct zone
*zone
);
2258 extern int min_free_kbytes
;
2259 extern int watermark_boost_factor
;
2260 extern int watermark_scale_factor
;
2263 extern atomic_long_t mmap_pages_allocated
;
2264 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
2266 /* interval_tree.c */
2267 void vma_interval_tree_insert(struct vm_area_struct
*node
,
2268 struct rb_root_cached
*root
);
2269 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
2270 struct vm_area_struct
*prev
,
2271 struct rb_root_cached
*root
);
2272 void vma_interval_tree_remove(struct vm_area_struct
*node
,
2273 struct rb_root_cached
*root
);
2274 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root_cached
*root
,
2275 unsigned long start
, unsigned long last
);
2276 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
2277 unsigned long start
, unsigned long last
);
2279 #define vma_interval_tree_foreach(vma, root, start, last) \
2280 for (vma = vma_interval_tree_iter_first(root, start, last); \
2281 vma; vma = vma_interval_tree_iter_next(vma, start, last))
2283 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
2284 struct rb_root_cached
*root
);
2285 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
2286 struct rb_root_cached
*root
);
2287 struct anon_vma_chain
*
2288 anon_vma_interval_tree_iter_first(struct rb_root_cached
*root
,
2289 unsigned long start
, unsigned long last
);
2290 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
2291 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
2292 #ifdef CONFIG_DEBUG_VM_RB
2293 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
2296 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
2297 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
2298 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
2301 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
2302 extern int __vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
2303 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
,
2304 struct vm_area_struct
*expand
);
2305 static inline int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
2306 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
)
2308 return __vma_adjust(vma
, start
, end
, pgoff
, insert
, NULL
);
2310 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
2311 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
2312 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
2313 struct mempolicy
*, struct vm_userfaultfd_ctx
);
2314 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
2315 extern int __split_vma(struct mm_struct
*, struct vm_area_struct
*,
2316 unsigned long addr
, int new_below
);
2317 extern int split_vma(struct mm_struct
*, struct vm_area_struct
*,
2318 unsigned long addr
, int new_below
);
2319 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
2320 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
2321 struct rb_node
**, struct rb_node
*);
2322 extern void unlink_file_vma(struct vm_area_struct
*);
2323 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
2324 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
2325 bool *need_rmap_locks
);
2326 extern void exit_mmap(struct mm_struct
*);
2328 static inline int check_data_rlimit(unsigned long rlim
,
2330 unsigned long start
,
2331 unsigned long end_data
,
2332 unsigned long start_data
)
2334 if (rlim
< RLIM_INFINITY
) {
2335 if (((new - start
) + (end_data
- start_data
)) > rlim
)
2342 extern int mm_take_all_locks(struct mm_struct
*mm
);
2343 extern void mm_drop_all_locks(struct mm_struct
*mm
);
2345 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
2346 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
2347 extern struct file
*get_task_exe_file(struct task_struct
*task
);
2349 extern bool may_expand_vm(struct mm_struct
*, vm_flags_t
, unsigned long npages
);
2350 extern void vm_stat_account(struct mm_struct
*, vm_flags_t
, long npages
);
2352 extern bool vma_is_special_mapping(const struct vm_area_struct
*vma
,
2353 const struct vm_special_mapping
*sm
);
2354 extern struct vm_area_struct
*_install_special_mapping(struct mm_struct
*mm
,
2355 unsigned long addr
, unsigned long len
,
2356 unsigned long flags
,
2357 const struct vm_special_mapping
*spec
);
2358 /* This is an obsolete alternative to _install_special_mapping. */
2359 extern int install_special_mapping(struct mm_struct
*mm
,
2360 unsigned long addr
, unsigned long len
,
2361 unsigned long flags
, struct page
**pages
);
2363 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
2365 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
2366 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
,
2367 struct list_head
*uf
);
2368 extern unsigned long do_mmap(struct file
*file
, unsigned long addr
,
2369 unsigned long len
, unsigned long prot
, unsigned long flags
,
2370 vm_flags_t vm_flags
, unsigned long pgoff
, unsigned long *populate
,
2371 struct list_head
*uf
);
2372 extern int __do_munmap(struct mm_struct
*, unsigned long, size_t,
2373 struct list_head
*uf
, bool downgrade
);
2374 extern int do_munmap(struct mm_struct
*, unsigned long, size_t,
2375 struct list_head
*uf
);
2377 static inline unsigned long
2378 do_mmap_pgoff(struct file
*file
, unsigned long addr
,
2379 unsigned long len
, unsigned long prot
, unsigned long flags
,
2380 unsigned long pgoff
, unsigned long *populate
,
2381 struct list_head
*uf
)
2383 return do_mmap(file
, addr
, len
, prot
, flags
, 0, pgoff
, populate
, uf
);
2387 extern int __mm_populate(unsigned long addr
, unsigned long len
,
2389 static inline void mm_populate(unsigned long addr
, unsigned long len
)
2392 (void) __mm_populate(addr
, len
, 1);
2395 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
2398 /* These take the mm semaphore themselves */
2399 extern int __must_check
vm_brk(unsigned long, unsigned long);
2400 extern int __must_check
vm_brk_flags(unsigned long, unsigned long, unsigned long);
2401 extern int vm_munmap(unsigned long, size_t);
2402 extern unsigned long __must_check
vm_mmap(struct file
*, unsigned long,
2403 unsigned long, unsigned long,
2404 unsigned long, unsigned long);
2406 struct vm_unmapped_area_info
{
2407 #define VM_UNMAPPED_AREA_TOPDOWN 1
2408 unsigned long flags
;
2409 unsigned long length
;
2410 unsigned long low_limit
;
2411 unsigned long high_limit
;
2412 unsigned long align_mask
;
2413 unsigned long align_offset
;
2416 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
2417 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
2420 * Search for an unmapped address range.
2422 * We are looking for a range that:
2423 * - does not intersect with any VMA;
2424 * - is contained within the [low_limit, high_limit) interval;
2425 * - is at least the desired size.
2426 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
2428 static inline unsigned long
2429 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
2431 if (info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
)
2432 return unmapped_area_topdown(info
);
2434 return unmapped_area(info
);
2438 extern void truncate_inode_pages(struct address_space
*, loff_t
);
2439 extern void truncate_inode_pages_range(struct address_space
*,
2440 loff_t lstart
, loff_t lend
);
2441 extern void truncate_inode_pages_final(struct address_space
*);
2443 /* generic vm_area_ops exported for stackable file systems */
2444 extern vm_fault_t
filemap_fault(struct vm_fault
*vmf
);
2445 extern void filemap_map_pages(struct vm_fault
*vmf
,
2446 pgoff_t start_pgoff
, pgoff_t end_pgoff
);
2447 extern vm_fault_t
filemap_page_mkwrite(struct vm_fault
*vmf
);
2449 /* mm/page-writeback.c */
2450 int __must_check
write_one_page(struct page
*page
);
2451 void task_dirty_inc(struct task_struct
*tsk
);
2454 #define VM_MAX_READAHEAD 128 /* kbytes */
2455 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
2457 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
2458 pgoff_t offset
, unsigned long nr_to_read
);
2460 void page_cache_sync_readahead(struct address_space
*mapping
,
2461 struct file_ra_state
*ra
,
2464 unsigned long size
);
2466 void page_cache_async_readahead(struct address_space
*mapping
,
2467 struct file_ra_state
*ra
,
2471 unsigned long size
);
2473 extern unsigned long stack_guard_gap
;
2474 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
2475 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
2477 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
2478 extern int expand_downwards(struct vm_area_struct
*vma
,
2479 unsigned long address
);
2481 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
2483 #define expand_upwards(vma, address) (0)
2486 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
2487 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
2488 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
2489 struct vm_area_struct
**pprev
);
2491 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
2492 NULL if none. Assume start_addr < end_addr. */
2493 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
2495 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
2497 if (vma
&& end_addr
<= vma
->vm_start
)
2502 static inline unsigned long vm_start_gap(struct vm_area_struct
*vma
)
2504 unsigned long vm_start
= vma
->vm_start
;
2506 if (vma
->vm_flags
& VM_GROWSDOWN
) {
2507 vm_start
-= stack_guard_gap
;
2508 if (vm_start
> vma
->vm_start
)
2514 static inline unsigned long vm_end_gap(struct vm_area_struct
*vma
)
2516 unsigned long vm_end
= vma
->vm_end
;
2518 if (vma
->vm_flags
& VM_GROWSUP
) {
2519 vm_end
+= stack_guard_gap
;
2520 if (vm_end
< vma
->vm_end
)
2521 vm_end
= -PAGE_SIZE
;
2526 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
2528 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
2531 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2532 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
2533 unsigned long vm_start
, unsigned long vm_end
)
2535 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
2537 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
2543 static inline bool range_in_vma(struct vm_area_struct
*vma
,
2544 unsigned long start
, unsigned long end
)
2546 return (vma
&& vma
->vm_start
<= start
&& end
<= vma
->vm_end
);
2550 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
2551 void vma_set_page_prot(struct vm_area_struct
*vma
);
2553 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
2557 static inline void vma_set_page_prot(struct vm_area_struct
*vma
)
2559 vma
->vm_page_prot
= vm_get_page_prot(vma
->vm_flags
);
2563 #ifdef CONFIG_NUMA_BALANCING
2564 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
2565 unsigned long start
, unsigned long end
);
2568 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
2569 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
2570 unsigned long pfn
, unsigned long size
, pgprot_t
);
2571 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
2572 vm_fault_t
vmf_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
2574 vm_fault_t
vmf_insert_pfn_prot(struct vm_area_struct
*vma
, unsigned long addr
,
2575 unsigned long pfn
, pgprot_t pgprot
);
2576 vm_fault_t
vmf_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
2578 vm_fault_t
vmf_insert_mixed_mkwrite(struct vm_area_struct
*vma
,
2579 unsigned long addr
, pfn_t pfn
);
2580 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
2582 static inline vm_fault_t
vmf_insert_page(struct vm_area_struct
*vma
,
2583 unsigned long addr
, struct page
*page
)
2585 int err
= vm_insert_page(vma
, addr
, page
);
2588 return VM_FAULT_OOM
;
2589 if (err
< 0 && err
!= -EBUSY
)
2590 return VM_FAULT_SIGBUS
;
2592 return VM_FAULT_NOPAGE
;
2595 static inline vm_fault_t
vmf_error(int err
)
2598 return VM_FAULT_OOM
;
2599 return VM_FAULT_SIGBUS
;
2602 struct page
*follow_page(struct vm_area_struct
*vma
, unsigned long address
,
2603 unsigned int foll_flags
);
2605 #define FOLL_WRITE 0x01 /* check pte is writable */
2606 #define FOLL_TOUCH 0x02 /* mark page accessed */
2607 #define FOLL_GET 0x04 /* do get_page on page */
2608 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2609 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2610 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2611 * and return without waiting upon it */
2612 #define FOLL_POPULATE 0x40 /* fault in page */
2613 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2614 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2615 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2616 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2617 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2618 #define FOLL_MLOCK 0x1000 /* lock present pages */
2619 #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */
2620 #define FOLL_COW 0x4000 /* internal GUP flag */
2621 #define FOLL_ANON 0x8000 /* don't do file mappings */
2623 static inline int vm_fault_to_errno(vm_fault_t vm_fault
, int foll_flags
)
2625 if (vm_fault
& VM_FAULT_OOM
)
2627 if (vm_fault
& (VM_FAULT_HWPOISON
| VM_FAULT_HWPOISON_LARGE
))
2628 return (foll_flags
& FOLL_HWPOISON
) ? -EHWPOISON
: -EFAULT
;
2629 if (vm_fault
& (VM_FAULT_SIGBUS
| VM_FAULT_SIGSEGV
))
2634 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
2636 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
2637 unsigned long size
, pte_fn_t fn
, void *data
);
2640 #ifdef CONFIG_PAGE_POISONING
2641 extern bool page_poisoning_enabled(void);
2642 extern void kernel_poison_pages(struct page
*page
, int numpages
, int enable
);
2644 static inline bool page_poisoning_enabled(void) { return false; }
2645 static inline void kernel_poison_pages(struct page
*page
, int numpages
,
2649 #ifdef CONFIG_DEBUG_PAGEALLOC
2650 extern bool _debug_pagealloc_enabled
;
2651 extern void __kernel_map_pages(struct page
*page
, int numpages
, int enable
);
2653 static inline bool debug_pagealloc_enabled(void)
2655 return _debug_pagealloc_enabled
;
2659 kernel_map_pages(struct page
*page
, int numpages
, int enable
)
2661 if (!debug_pagealloc_enabled())
2664 __kernel_map_pages(page
, numpages
, enable
);
2666 #ifdef CONFIG_HIBERNATION
2667 extern bool kernel_page_present(struct page
*page
);
2668 #endif /* CONFIG_HIBERNATION */
2669 #else /* CONFIG_DEBUG_PAGEALLOC */
2671 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
2672 #ifdef CONFIG_HIBERNATION
2673 static inline bool kernel_page_present(struct page
*page
) { return true; }
2674 #endif /* CONFIG_HIBERNATION */
2675 static inline bool debug_pagealloc_enabled(void)
2679 #endif /* CONFIG_DEBUG_PAGEALLOC */
2681 #ifdef __HAVE_ARCH_GATE_AREA
2682 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
2683 extern int in_gate_area_no_mm(unsigned long addr
);
2684 extern int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
2686 static inline struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
)
2690 static inline int in_gate_area_no_mm(unsigned long addr
) { return 0; }
2691 static inline int in_gate_area(struct mm_struct
*mm
, unsigned long addr
)
2695 #endif /* __HAVE_ARCH_GATE_AREA */
2697 extern bool process_shares_mm(struct task_struct
*p
, struct mm_struct
*mm
);
2699 #ifdef CONFIG_SYSCTL
2700 extern int sysctl_drop_caches
;
2701 int drop_caches_sysctl_handler(struct ctl_table
*, int,
2702 void __user
*, size_t *, loff_t
*);
2705 void drop_slab(void);
2706 void drop_slab_node(int nid
);
2709 #define randomize_va_space 0
2711 extern int randomize_va_space
;
2714 const char * arch_vma_name(struct vm_area_struct
*vma
);
2715 void print_vma_addr(char *prefix
, unsigned long rip
);
2717 void *sparse_buffer_alloc(unsigned long size
);
2718 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
,
2719 struct vmem_altmap
*altmap
);
2720 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
2721 p4d_t
*vmemmap_p4d_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
2722 pud_t
*vmemmap_pud_populate(p4d_t
*p4d
, unsigned long addr
, int node
);
2723 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
2724 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
2725 void *vmemmap_alloc_block(unsigned long size
, int node
);
2727 void *vmemmap_alloc_block_buf(unsigned long size
, int node
);
2728 void *altmap_alloc_block_buf(unsigned long size
, struct vmem_altmap
*altmap
);
2729 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
2730 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
2732 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
,
2733 struct vmem_altmap
*altmap
);
2734 void vmemmap_populate_print_last(void);
2735 #ifdef CONFIG_MEMORY_HOTPLUG
2736 void vmemmap_free(unsigned long start
, unsigned long end
,
2737 struct vmem_altmap
*altmap
);
2739 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
2740 unsigned long nr_pages
);
2743 MF_COUNT_INCREASED
= 1 << 0,
2744 MF_ACTION_REQUIRED
= 1 << 1,
2745 MF_MUST_KILL
= 1 << 2,
2746 MF_SOFT_OFFLINE
= 1 << 3,
2748 extern int memory_failure(unsigned long pfn
, int flags
);
2749 extern void memory_failure_queue(unsigned long pfn
, int flags
);
2750 extern int unpoison_memory(unsigned long pfn
);
2751 extern int get_hwpoison_page(struct page
*page
);
2752 #define put_hwpoison_page(page) put_page(page)
2753 extern int sysctl_memory_failure_early_kill
;
2754 extern int sysctl_memory_failure_recovery
;
2755 extern void shake_page(struct page
*p
, int access
);
2756 extern atomic_long_t num_poisoned_pages __read_mostly
;
2757 extern int soft_offline_page(struct page
*page
, int flags
);
2761 * Error handlers for various types of pages.
2764 MF_IGNORED
, /* Error: cannot be handled */
2765 MF_FAILED
, /* Error: handling failed */
2766 MF_DELAYED
, /* Will be handled later */
2767 MF_RECOVERED
, /* Successfully recovered */
2770 enum mf_action_page_type
{
2772 MF_MSG_KERNEL_HIGH_ORDER
,
2774 MF_MSG_DIFFERENT_COMPOUND
,
2775 MF_MSG_POISONED_HUGE
,
2778 MF_MSG_NON_PMD_HUGE
,
2779 MF_MSG_UNMAP_FAILED
,
2780 MF_MSG_DIRTY_SWAPCACHE
,
2781 MF_MSG_CLEAN_SWAPCACHE
,
2782 MF_MSG_DIRTY_MLOCKED_LRU
,
2783 MF_MSG_CLEAN_MLOCKED_LRU
,
2784 MF_MSG_DIRTY_UNEVICTABLE_LRU
,
2785 MF_MSG_CLEAN_UNEVICTABLE_LRU
,
2788 MF_MSG_TRUNCATED_LRU
,
2795 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2796 extern void clear_huge_page(struct page
*page
,
2797 unsigned long addr_hint
,
2798 unsigned int pages_per_huge_page
);
2799 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
2800 unsigned long addr_hint
,
2801 struct vm_area_struct
*vma
,
2802 unsigned int pages_per_huge_page
);
2803 extern long copy_huge_page_from_user(struct page
*dst_page
,
2804 const void __user
*usr_src
,
2805 unsigned int pages_per_huge_page
,
2806 bool allow_pagefault
);
2807 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2809 extern struct page_ext_operations debug_guardpage_ops
;
2811 #ifdef CONFIG_DEBUG_PAGEALLOC
2812 extern unsigned int _debug_guardpage_minorder
;
2813 extern bool _debug_guardpage_enabled
;
2815 static inline unsigned int debug_guardpage_minorder(void)
2817 return _debug_guardpage_minorder
;
2820 static inline bool debug_guardpage_enabled(void)
2822 return _debug_guardpage_enabled
;
2825 static inline bool page_is_guard(struct page
*page
)
2827 struct page_ext
*page_ext
;
2829 if (!debug_guardpage_enabled())
2832 page_ext
= lookup_page_ext(page
);
2833 if (unlikely(!page_ext
))
2836 return test_bit(PAGE_EXT_DEBUG_GUARD
, &page_ext
->flags
);
2839 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2840 static inline bool debug_guardpage_enabled(void) { return false; }
2841 static inline bool page_is_guard(struct page
*page
) { return false; }
2842 #endif /* CONFIG_DEBUG_PAGEALLOC */
2844 #if MAX_NUMNODES > 1
2845 void __init
setup_nr_node_ids(void);
2847 static inline void setup_nr_node_ids(void) {}
2850 #endif /* __KERNEL__ */
2851 #endif /* _LINUX_MM_H */