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>
31 struct anon_vma_chain
;
34 struct writeback_control
;
37 void init_mm_internals(void);
39 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
40 extern unsigned long max_mapnr
;
42 static inline void set_max_mapnr(unsigned long limit
)
47 static inline void set_max_mapnr(unsigned long limit
) { }
50 extern unsigned long totalram_pages
;
51 extern void * high_memory
;
52 extern int page_cluster
;
55 extern int sysctl_legacy_va_layout
;
57 #define sysctl_legacy_va_layout 0
60 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
61 extern const int mmap_rnd_bits_min
;
62 extern const int mmap_rnd_bits_max
;
63 extern int mmap_rnd_bits __read_mostly
;
65 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
66 extern const int mmap_rnd_compat_bits_min
;
67 extern const int mmap_rnd_compat_bits_max
;
68 extern int mmap_rnd_compat_bits __read_mostly
;
72 #include <asm/pgtable.h>
73 #include <asm/processor.h>
76 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
80 #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
84 #define lm_alias(x) __va(__pa_symbol(x))
88 * To prevent common memory management code establishing
89 * a zero page mapping on a read fault.
90 * This macro should be defined within <asm/pgtable.h>.
91 * s390 does this to prevent multiplexing of hardware bits
92 * related to the physical page in case of virtualization.
94 #ifndef mm_forbids_zeropage
95 #define mm_forbids_zeropage(X) (0)
99 * Default maximum number of active map areas, this limits the number of vmas
100 * per mm struct. Users can overwrite this number by sysctl but there is a
103 * When a program's coredump is generated as ELF format, a section is created
104 * per a vma. In ELF, the number of sections is represented in unsigned short.
105 * This means the number of sections should be smaller than 65535 at coredump.
106 * Because the kernel adds some informative sections to a image of program at
107 * generating coredump, we need some margin. The number of extra sections is
108 * 1-3 now and depends on arch. We use "5" as safe margin, here.
110 * ELF extended numbering allows more than 65535 sections, so 16-bit bound is
111 * not a hard limit any more. Although some userspace tools can be surprised by
114 #define MAPCOUNT_ELF_CORE_MARGIN (5)
115 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
117 extern int sysctl_max_map_count
;
119 extern unsigned long sysctl_user_reserve_kbytes
;
120 extern unsigned long sysctl_admin_reserve_kbytes
;
122 extern int sysctl_overcommit_memory
;
123 extern int sysctl_overcommit_ratio
;
124 extern unsigned long sysctl_overcommit_kbytes
;
126 extern int overcommit_ratio_handler(struct ctl_table
*, int, void __user
*,
128 extern int overcommit_kbytes_handler(struct ctl_table
*, int, void __user
*,
131 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
133 /* to align the pointer to the (next) page boundary */
134 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
136 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
137 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE)
140 * Linux kernel virtual memory manager primitives.
141 * The idea being to have a "virtual" mm in the same way
142 * we have a virtual fs - giving a cleaner interface to the
143 * mm details, and allowing different kinds of memory mappings
144 * (from shared memory to executable loading to arbitrary
148 extern struct kmem_cache
*vm_area_cachep
;
151 extern struct rb_root nommu_region_tree
;
152 extern struct rw_semaphore nommu_region_sem
;
154 extern unsigned int kobjsize(const void *objp
);
158 * vm_flags in vm_area_struct, see mm_types.h.
159 * When changing, update also include/trace/events/mmflags.h
161 #define VM_NONE 0x00000000
163 #define VM_READ 0x00000001 /* currently active flags */
164 #define VM_WRITE 0x00000002
165 #define VM_EXEC 0x00000004
166 #define VM_SHARED 0x00000008
168 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
169 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
170 #define VM_MAYWRITE 0x00000020
171 #define VM_MAYEXEC 0x00000040
172 #define VM_MAYSHARE 0x00000080
174 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
175 #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
176 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
177 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
178 #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
180 #define VM_LOCKED 0x00002000
181 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
183 /* Used by sys_madvise() */
184 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
185 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
187 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
188 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
189 #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
190 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
191 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
192 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
193 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
194 #define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */
195 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
197 #ifdef CONFIG_MEM_SOFT_DIRTY
198 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
200 # define VM_SOFTDIRTY 0
203 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
204 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
205 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
206 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
208 #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
209 #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */
210 #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */
211 #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */
212 #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */
213 #define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */
214 #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0)
215 #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1)
216 #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2)
217 #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3)
218 #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4)
219 #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
221 #if defined(CONFIG_X86)
222 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
223 #if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS)
224 # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0
225 # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */
226 # define VM_PKEY_BIT1 VM_HIGH_ARCH_1
227 # define VM_PKEY_BIT2 VM_HIGH_ARCH_2
228 # define VM_PKEY_BIT3 VM_HIGH_ARCH_3
230 #elif defined(CONFIG_PPC)
231 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
232 #elif defined(CONFIG_PARISC)
233 # define VM_GROWSUP VM_ARCH_1
234 #elif defined(CONFIG_METAG)
235 # define VM_GROWSUP VM_ARCH_1
236 #elif defined(CONFIG_IA64)
237 # define VM_GROWSUP VM_ARCH_1
238 #elif !defined(CONFIG_MMU)
239 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
242 #if defined(CONFIG_X86_INTEL_MPX)
243 /* MPX specific bounds table or bounds directory */
244 # define VM_MPX VM_HIGH_ARCH_4
246 # define VM_MPX VM_NONE
250 # define VM_GROWSUP VM_NONE
253 /* Bits set in the VMA until the stack is in its final location */
254 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
256 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
257 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
260 #ifdef CONFIG_STACK_GROWSUP
261 #define VM_STACK VM_GROWSUP
263 #define VM_STACK VM_GROWSDOWN
266 #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
269 * Special vmas that are non-mergable, non-mlock()able.
270 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
272 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
274 /* This mask defines which mm->def_flags a process can inherit its parent */
275 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
277 /* This mask is used to clear all the VMA flags used by mlock */
278 #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
281 * mapping from the currently active vm_flags protection bits (the
282 * low four bits) to a page protection mask..
284 extern pgprot_t protection_map
[16];
286 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
287 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
288 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
289 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
290 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
291 #define FAULT_FLAG_TRIED 0x20 /* Second try */
292 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
293 #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */
294 #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */
296 #define FAULT_FLAG_TRACE \
297 { FAULT_FLAG_WRITE, "WRITE" }, \
298 { FAULT_FLAG_MKWRITE, "MKWRITE" }, \
299 { FAULT_FLAG_ALLOW_RETRY, "ALLOW_RETRY" }, \
300 { FAULT_FLAG_RETRY_NOWAIT, "RETRY_NOWAIT" }, \
301 { FAULT_FLAG_KILLABLE, "KILLABLE" }, \
302 { FAULT_FLAG_TRIED, "TRIED" }, \
303 { FAULT_FLAG_USER, "USER" }, \
304 { FAULT_FLAG_REMOTE, "REMOTE" }, \
305 { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" }
308 * vm_fault is filled by the the pagefault handler and passed to the vma's
309 * ->fault function. The vma's ->fault is responsible for returning a bitmask
310 * of VM_FAULT_xxx flags that give details about how the fault was handled.
312 * MM layer fills up gfp_mask for page allocations but fault handler might
313 * alter it if its implementation requires a different allocation context.
315 * pgoff should be used in favour of virtual_address, if possible.
318 struct vm_area_struct
*vma
; /* Target VMA */
319 unsigned int flags
; /* FAULT_FLAG_xxx flags */
320 gfp_t gfp_mask
; /* gfp mask to be used for allocations */
321 pgoff_t pgoff
; /* Logical page offset based on vma */
322 unsigned long address
; /* Faulting virtual address */
323 pmd_t
*pmd
; /* Pointer to pmd entry matching
325 pud_t
*pud
; /* Pointer to pud entry matching
328 pte_t orig_pte
; /* Value of PTE at the time of fault */
330 struct page
*cow_page
; /* Page handler may use for COW fault */
331 struct mem_cgroup
*memcg
; /* Cgroup cow_page belongs to */
332 struct page
*page
; /* ->fault handlers should return a
333 * page here, unless VM_FAULT_NOPAGE
334 * is set (which is also implied by
337 /* These three entries are valid only while holding ptl lock */
338 pte_t
*pte
; /* Pointer to pte entry matching
339 * the 'address'. NULL if the page
340 * table hasn't been allocated.
342 spinlock_t
*ptl
; /* Page table lock.
343 * Protects pte page table if 'pte'
344 * is not NULL, otherwise pmd.
346 pgtable_t prealloc_pte
; /* Pre-allocated pte page table.
347 * vm_ops->map_pages() calls
348 * alloc_set_pte() from atomic context.
349 * do_fault_around() pre-allocates
350 * page table to avoid allocation from
355 /* page entry size for vm->huge_fault() */
356 enum page_entry_size
{
363 * These are the virtual MM functions - opening of an area, closing and
364 * unmapping it (needed to keep files on disk up-to-date etc), pointer
365 * to the functions called when a no-page or a wp-page exception occurs.
367 struct vm_operations_struct
{
368 void (*open
)(struct vm_area_struct
* area
);
369 void (*close
)(struct vm_area_struct
* area
);
370 int (*mremap
)(struct vm_area_struct
* area
);
371 int (*fault
)(struct vm_fault
*vmf
);
372 int (*huge_fault
)(struct vm_fault
*vmf
, enum page_entry_size pe_size
);
373 void (*map_pages
)(struct vm_fault
*vmf
,
374 pgoff_t start_pgoff
, pgoff_t end_pgoff
);
376 /* notification that a previously read-only page is about to become
377 * writable, if an error is returned it will cause a SIGBUS */
378 int (*page_mkwrite
)(struct vm_fault
*vmf
);
380 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
381 int (*pfn_mkwrite
)(struct vm_fault
*vmf
);
383 /* called by access_process_vm when get_user_pages() fails, typically
384 * for use by special VMAs that can switch between memory and hardware
386 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
387 void *buf
, int len
, int write
);
389 /* Called by the /proc/PID/maps code to ask the vma whether it
390 * has a special name. Returning non-NULL will also cause this
391 * vma to be dumped unconditionally. */
392 const char *(*name
)(struct vm_area_struct
*vma
);
396 * set_policy() op must add a reference to any non-NULL @new mempolicy
397 * to hold the policy upon return. Caller should pass NULL @new to
398 * remove a policy and fall back to surrounding context--i.e. do not
399 * install a MPOL_DEFAULT policy, nor the task or system default
402 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
405 * get_policy() op must add reference [mpol_get()] to any policy at
406 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
407 * in mm/mempolicy.c will do this automatically.
408 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
409 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
410 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
411 * must return NULL--i.e., do not "fallback" to task or system default
414 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
418 * Called by vm_normal_page() for special PTEs to find the
419 * page for @addr. This is useful if the default behavior
420 * (using pte_page()) would not find the correct page.
422 struct page
*(*find_special_page
)(struct vm_area_struct
*vma
,
429 #define page_private(page) ((page)->private)
430 #define set_page_private(page, v) ((page)->private = (v))
432 #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
433 static inline int pmd_devmap(pmd_t pmd
)
437 static inline int pud_devmap(pud_t pud
)
441 static inline int pgd_devmap(pgd_t pgd
)
448 * FIXME: take this include out, include page-flags.h in
449 * files which need it (119 of them)
451 #include <linux/page-flags.h>
452 #include <linux/huge_mm.h>
455 * Methods to modify the page usage count.
457 * What counts for a page usage:
458 * - cache mapping (page->mapping)
459 * - private data (page->private)
460 * - page mapped in a task's page tables, each mapping
461 * is counted separately
463 * Also, many kernel routines increase the page count before a critical
464 * routine so they can be sure the page doesn't go away from under them.
468 * Drop a ref, return true if the refcount fell to zero (the page has no users)
470 static inline int put_page_testzero(struct page
*page
)
472 VM_BUG_ON_PAGE(page_ref_count(page
) == 0, page
);
473 return page_ref_dec_and_test(page
);
477 * Try to grab a ref unless the page has a refcount of zero, return false if
479 * This can be called when MMU is off so it must not access
480 * any of the virtual mappings.
482 static inline int get_page_unless_zero(struct page
*page
)
484 return page_ref_add_unless(page
, 1, 0);
487 extern int page_is_ram(unsigned long pfn
);
495 int region_intersects(resource_size_t offset
, size_t size
, unsigned long flags
,
498 /* Support for virtually mapped pages */
499 struct page
*vmalloc_to_page(const void *addr
);
500 unsigned long vmalloc_to_pfn(const void *addr
);
503 * Determine if an address is within the vmalloc range
505 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
506 * is no special casing required.
508 static inline bool is_vmalloc_addr(const void *x
)
511 unsigned long addr
= (unsigned long)x
;
513 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
519 extern int is_vmalloc_or_module_addr(const void *x
);
521 static inline int is_vmalloc_or_module_addr(const void *x
)
527 extern void *kvmalloc_node(size_t size
, gfp_t flags
, int node
);
528 static inline void *kvmalloc(size_t size
, gfp_t flags
)
530 return kvmalloc_node(size
, flags
, NUMA_NO_NODE
);
532 static inline void *kvzalloc_node(size_t size
, gfp_t flags
, int node
)
534 return kvmalloc_node(size
, flags
| __GFP_ZERO
, node
);
536 static inline void *kvzalloc(size_t size
, gfp_t flags
)
538 return kvmalloc(size
, flags
| __GFP_ZERO
);
541 static inline void *kvmalloc_array(size_t n
, size_t size
, gfp_t flags
)
543 if (size
!= 0 && n
> SIZE_MAX
/ size
)
546 return kvmalloc(n
* size
, flags
);
549 extern void kvfree(const void *addr
);
551 static inline atomic_t
*compound_mapcount_ptr(struct page
*page
)
553 return &page
[1].compound_mapcount
;
556 static inline int compound_mapcount(struct page
*page
)
558 VM_BUG_ON_PAGE(!PageCompound(page
), page
);
559 page
= compound_head(page
);
560 return atomic_read(compound_mapcount_ptr(page
)) + 1;
564 * The atomic page->_mapcount, starts from -1: so that transitions
565 * both from it and to it can be tracked, using atomic_inc_and_test
566 * and atomic_add_negative(-1).
568 static inline void page_mapcount_reset(struct page
*page
)
570 atomic_set(&(page
)->_mapcount
, -1);
573 int __page_mapcount(struct page
*page
);
575 static inline int page_mapcount(struct page
*page
)
577 VM_BUG_ON_PAGE(PageSlab(page
), page
);
579 if (unlikely(PageCompound(page
)))
580 return __page_mapcount(page
);
581 return atomic_read(&page
->_mapcount
) + 1;
584 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
585 int total_mapcount(struct page
*page
);
586 int page_trans_huge_mapcount(struct page
*page
, int *total_mapcount
);
588 static inline int total_mapcount(struct page
*page
)
590 return page_mapcount(page
);
592 static inline int page_trans_huge_mapcount(struct page
*page
,
595 int mapcount
= page_mapcount(page
);
597 *total_mapcount
= mapcount
;
602 static inline struct page
*virt_to_head_page(const void *x
)
604 struct page
*page
= virt_to_page(x
);
606 return compound_head(page
);
609 void __put_page(struct page
*page
);
611 void put_pages_list(struct list_head
*pages
);
613 void split_page(struct page
*page
, unsigned int order
);
616 * Compound pages have a destructor function. Provide a
617 * prototype for that function and accessor functions.
618 * These are _only_ valid on the head of a compound page.
620 typedef void compound_page_dtor(struct page
*);
622 /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
623 enum compound_dtor_id
{
626 #ifdef CONFIG_HUGETLB_PAGE
629 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
634 extern compound_page_dtor
* const compound_page_dtors
[];
636 static inline void set_compound_page_dtor(struct page
*page
,
637 enum compound_dtor_id compound_dtor
)
639 VM_BUG_ON_PAGE(compound_dtor
>= NR_COMPOUND_DTORS
, page
);
640 page
[1].compound_dtor
= compound_dtor
;
643 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
645 VM_BUG_ON_PAGE(page
[1].compound_dtor
>= NR_COMPOUND_DTORS
, page
);
646 return compound_page_dtors
[page
[1].compound_dtor
];
649 static inline unsigned int compound_order(struct page
*page
)
653 return page
[1].compound_order
;
656 static inline void set_compound_order(struct page
*page
, unsigned int order
)
658 page
[1].compound_order
= order
;
661 void free_compound_page(struct page
*page
);
665 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
666 * servicing faults for write access. In the normal case, do always want
667 * pte_mkwrite. But get_user_pages can cause write faults for mappings
668 * that do not have writing enabled, when used by access_process_vm.
670 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
672 if (likely(vma
->vm_flags
& VM_WRITE
))
673 pte
= pte_mkwrite(pte
);
677 int alloc_set_pte(struct vm_fault
*vmf
, struct mem_cgroup
*memcg
,
679 int finish_fault(struct vm_fault
*vmf
);
680 int finish_mkwrite_fault(struct vm_fault
*vmf
);
684 * Multiple processes may "see" the same page. E.g. for untouched
685 * mappings of /dev/null, all processes see the same page full of
686 * zeroes, and text pages of executables and shared libraries have
687 * only one copy in memory, at most, normally.
689 * For the non-reserved pages, page_count(page) denotes a reference count.
690 * page_count() == 0 means the page is free. page->lru is then used for
691 * freelist management in the buddy allocator.
692 * page_count() > 0 means the page has been allocated.
694 * Pages are allocated by the slab allocator in order to provide memory
695 * to kmalloc and kmem_cache_alloc. In this case, the management of the
696 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
697 * unless a particular usage is carefully commented. (the responsibility of
698 * freeing the kmalloc memory is the caller's, of course).
700 * A page may be used by anyone else who does a __get_free_page().
701 * In this case, page_count still tracks the references, and should only
702 * be used through the normal accessor functions. The top bits of page->flags
703 * and page->virtual store page management information, but all other fields
704 * are unused and could be used privately, carefully. The management of this
705 * page is the responsibility of the one who allocated it, and those who have
706 * subsequently been given references to it.
708 * The other pages (we may call them "pagecache pages") are completely
709 * managed by the Linux memory manager: I/O, buffers, swapping etc.
710 * The following discussion applies only to them.
712 * A pagecache page contains an opaque `private' member, which belongs to the
713 * page's address_space. Usually, this is the address of a circular list of
714 * the page's disk buffers. PG_private must be set to tell the VM to call
715 * into the filesystem to release these pages.
717 * A page may belong to an inode's memory mapping. In this case, page->mapping
718 * is the pointer to the inode, and page->index is the file offset of the page,
719 * in units of PAGE_SIZE.
721 * If pagecache pages are not associated with an inode, they are said to be
722 * anonymous pages. These may become associated with the swapcache, and in that
723 * case PG_swapcache is set, and page->private is an offset into the swapcache.
725 * In either case (swapcache or inode backed), the pagecache itself holds one
726 * reference to the page. Setting PG_private should also increment the
727 * refcount. The each user mapping also has a reference to the page.
729 * The pagecache pages are stored in a per-mapping radix tree, which is
730 * rooted at mapping->page_tree, and indexed by offset.
731 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
732 * lists, we instead now tag pages as dirty/writeback in the radix tree.
734 * All pagecache pages may be subject to I/O:
735 * - inode pages may need to be read from disk,
736 * - inode pages which have been modified and are MAP_SHARED may need
737 * to be written back to the inode on disk,
738 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
739 * modified may need to be swapped out to swap space and (later) to be read
744 * The zone field is never updated after free_area_init_core()
745 * sets it, so none of the operations on it need to be atomic.
748 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
749 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
750 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
751 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
752 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
755 * Define the bit shifts to access each section. For non-existent
756 * sections we define the shift as 0; that plus a 0 mask ensures
757 * the compiler will optimise away reference to them.
759 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
760 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
761 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
762 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
764 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
765 #ifdef NODE_NOT_IN_PAGE_FLAGS
766 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
767 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
768 SECTIONS_PGOFF : ZONES_PGOFF)
770 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
771 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
772 NODES_PGOFF : ZONES_PGOFF)
775 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
777 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
778 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
781 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
782 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
783 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
784 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
785 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
787 static inline enum zone_type
page_zonenum(const struct page
*page
)
789 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
792 #ifdef CONFIG_ZONE_DEVICE
793 static inline bool is_zone_device_page(const struct page
*page
)
795 return page_zonenum(page
) == ZONE_DEVICE
;
798 static inline bool is_zone_device_page(const struct page
*page
)
804 #if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC)
805 void put_zone_device_private_or_public_page(struct page
*page
);
806 DECLARE_STATIC_KEY_FALSE(device_private_key
);
807 #define IS_HMM_ENABLED static_branch_unlikely(&device_private_key)
808 static inline bool is_device_private_page(const struct page
*page
);
809 static inline bool is_device_public_page(const struct page
*page
);
810 #else /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
811 static inline void put_zone_device_private_or_public_page(struct page
*page
)
814 #define IS_HMM_ENABLED 0
815 static inline bool is_device_private_page(const struct page
*page
)
819 static inline bool is_device_public_page(const struct page
*page
)
823 #endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
826 static inline void get_page(struct page
*page
)
828 page
= compound_head(page
);
830 * Getting a normal page or the head of a compound page
831 * requires to already have an elevated page->_refcount.
833 VM_BUG_ON_PAGE(page_ref_count(page
) <= 0, page
);
837 static inline void put_page(struct page
*page
)
839 page
= compound_head(page
);
842 * For private device pages we need to catch refcount transition from
843 * 2 to 1, when refcount reach one it means the private device page is
844 * free and we need to inform the device driver through callback. See
845 * include/linux/memremap.h and HMM for details.
847 if (IS_HMM_ENABLED
&& unlikely(is_device_private_page(page
) ||
848 unlikely(is_device_public_page(page
)))) {
849 put_zone_device_private_or_public_page(page
);
853 if (put_page_testzero(page
))
857 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
858 #define SECTION_IN_PAGE_FLAGS
862 * The identification function is mainly used by the buddy allocator for
863 * determining if two pages could be buddies. We are not really identifying
864 * the zone since we could be using the section number id if we do not have
865 * node id available in page flags.
866 * We only guarantee that it will return the same value for two combinable
869 static inline int page_zone_id(struct page
*page
)
871 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
874 static inline int zone_to_nid(struct zone
*zone
)
883 #ifdef NODE_NOT_IN_PAGE_FLAGS
884 extern int page_to_nid(const struct page
*page
);
886 static inline int page_to_nid(const struct page
*page
)
888 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
892 #ifdef CONFIG_NUMA_BALANCING
893 static inline int cpu_pid_to_cpupid(int cpu
, int pid
)
895 return ((cpu
& LAST__CPU_MASK
) << LAST__PID_SHIFT
) | (pid
& LAST__PID_MASK
);
898 static inline int cpupid_to_pid(int cpupid
)
900 return cpupid
& LAST__PID_MASK
;
903 static inline int cpupid_to_cpu(int cpupid
)
905 return (cpupid
>> LAST__PID_SHIFT
) & LAST__CPU_MASK
;
908 static inline int cpupid_to_nid(int cpupid
)
910 return cpu_to_node(cpupid_to_cpu(cpupid
));
913 static inline bool cpupid_pid_unset(int cpupid
)
915 return cpupid_to_pid(cpupid
) == (-1 & LAST__PID_MASK
);
918 static inline bool cpupid_cpu_unset(int cpupid
)
920 return cpupid_to_cpu(cpupid
) == (-1 & LAST__CPU_MASK
);
923 static inline bool __cpupid_match_pid(pid_t task_pid
, int cpupid
)
925 return (task_pid
& LAST__PID_MASK
) == cpupid_to_pid(cpupid
);
928 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
929 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
930 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
932 return xchg(&page
->_last_cpupid
, cpupid
& LAST_CPUPID_MASK
);
935 static inline int page_cpupid_last(struct page
*page
)
937 return page
->_last_cpupid
;
939 static inline void page_cpupid_reset_last(struct page
*page
)
941 page
->_last_cpupid
= -1 & LAST_CPUPID_MASK
;
944 static inline int page_cpupid_last(struct page
*page
)
946 return (page
->flags
>> LAST_CPUPID_PGSHIFT
) & LAST_CPUPID_MASK
;
949 extern int page_cpupid_xchg_last(struct page
*page
, int cpupid
);
951 static inline void page_cpupid_reset_last(struct page
*page
)
953 page
->flags
|= LAST_CPUPID_MASK
<< LAST_CPUPID_PGSHIFT
;
955 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
956 #else /* !CONFIG_NUMA_BALANCING */
957 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
959 return page_to_nid(page
); /* XXX */
962 static inline int page_cpupid_last(struct page
*page
)
964 return page_to_nid(page
); /* XXX */
967 static inline int cpupid_to_nid(int cpupid
)
972 static inline int cpupid_to_pid(int cpupid
)
977 static inline int cpupid_to_cpu(int cpupid
)
982 static inline int cpu_pid_to_cpupid(int nid
, int pid
)
987 static inline bool cpupid_pid_unset(int cpupid
)
992 static inline void page_cpupid_reset_last(struct page
*page
)
996 static inline bool cpupid_match_pid(struct task_struct
*task
, int cpupid
)
1000 #endif /* CONFIG_NUMA_BALANCING */
1002 static inline struct zone
*page_zone(const struct page
*page
)
1004 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
1007 static inline pg_data_t
*page_pgdat(const struct page
*page
)
1009 return NODE_DATA(page_to_nid(page
));
1012 #ifdef SECTION_IN_PAGE_FLAGS
1013 static inline void set_page_section(struct page
*page
, unsigned long section
)
1015 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
1016 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
1019 static inline unsigned long page_to_section(const struct page
*page
)
1021 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
1025 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
1027 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
1028 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
1031 static inline void set_page_node(struct page
*page
, unsigned long node
)
1033 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
1034 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
1037 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
1038 unsigned long node
, unsigned long pfn
)
1040 set_page_zone(page
, zone
);
1041 set_page_node(page
, node
);
1042 #ifdef SECTION_IN_PAGE_FLAGS
1043 set_page_section(page
, pfn_to_section_nr(pfn
));
1048 static inline struct mem_cgroup
*page_memcg(struct page
*page
)
1050 return page
->mem_cgroup
;
1052 static inline struct mem_cgroup
*page_memcg_rcu(struct page
*page
)
1054 WARN_ON_ONCE(!rcu_read_lock_held());
1055 return READ_ONCE(page
->mem_cgroup
);
1058 static inline struct mem_cgroup
*page_memcg(struct page
*page
)
1062 static inline struct mem_cgroup
*page_memcg_rcu(struct page
*page
)
1064 WARN_ON_ONCE(!rcu_read_lock_held());
1070 * Some inline functions in vmstat.h depend on page_zone()
1072 #include <linux/vmstat.h>
1074 static __always_inline
void *lowmem_page_address(const struct page
*page
)
1076 return page_to_virt(page
);
1079 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
1080 #define HASHED_PAGE_VIRTUAL
1083 #if defined(WANT_PAGE_VIRTUAL)
1084 static inline void *page_address(const struct page
*page
)
1086 return page
->virtual;
1088 static inline void set_page_address(struct page
*page
, void *address
)
1090 page
->virtual = address
;
1092 #define page_address_init() do { } while(0)
1095 #if defined(HASHED_PAGE_VIRTUAL)
1096 void *page_address(const struct page
*page
);
1097 void set_page_address(struct page
*page
, void *virtual);
1098 void page_address_init(void);
1101 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
1102 #define page_address(page) lowmem_page_address(page)
1103 #define set_page_address(page, address) do { } while(0)
1104 #define page_address_init() do { } while(0)
1107 extern void *page_rmapping(struct page
*page
);
1108 extern struct anon_vma
*page_anon_vma(struct page
*page
);
1109 extern struct address_space
*page_mapping(struct page
*page
);
1111 extern struct address_space
*__page_file_mapping(struct page
*);
1114 struct address_space
*page_file_mapping(struct page
*page
)
1116 if (unlikely(PageSwapCache(page
)))
1117 return __page_file_mapping(page
);
1119 return page
->mapping
;
1122 extern pgoff_t
__page_file_index(struct page
*page
);
1125 * Return the pagecache index of the passed page. Regular pagecache pages
1126 * use ->index whereas swapcache pages use swp_offset(->private)
1128 static inline pgoff_t
page_index(struct page
*page
)
1130 if (unlikely(PageSwapCache(page
)))
1131 return __page_file_index(page
);
1135 bool page_mapped(struct page
*page
);
1136 struct address_space
*page_mapping(struct page
*page
);
1139 * Return true only if the page has been allocated with
1140 * ALLOC_NO_WATERMARKS and the low watermark was not
1141 * met implying that the system is under some pressure.
1143 static inline bool page_is_pfmemalloc(struct page
*page
)
1146 * Page index cannot be this large so this must be
1147 * a pfmemalloc page.
1149 return page
->index
== -1UL;
1153 * Only to be called by the page allocator on a freshly allocated
1156 static inline void set_page_pfmemalloc(struct page
*page
)
1161 static inline void clear_page_pfmemalloc(struct page
*page
)
1167 * Different kinds of faults, as returned by handle_mm_fault().
1168 * Used to decide whether a process gets delivered SIGBUS or
1169 * just gets major/minor fault counters bumped up.
1172 #define VM_FAULT_OOM 0x0001
1173 #define VM_FAULT_SIGBUS 0x0002
1174 #define VM_FAULT_MAJOR 0x0004
1175 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1176 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1177 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1178 #define VM_FAULT_SIGSEGV 0x0040
1180 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1181 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1182 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1183 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1184 #define VM_FAULT_DONE_COW 0x1000 /* ->fault has fully handled COW */
1186 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1188 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1189 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1192 #define VM_FAULT_RESULT_TRACE \
1193 { VM_FAULT_OOM, "OOM" }, \
1194 { VM_FAULT_SIGBUS, "SIGBUS" }, \
1195 { VM_FAULT_MAJOR, "MAJOR" }, \
1196 { VM_FAULT_WRITE, "WRITE" }, \
1197 { VM_FAULT_HWPOISON, "HWPOISON" }, \
1198 { VM_FAULT_HWPOISON_LARGE, "HWPOISON_LARGE" }, \
1199 { VM_FAULT_SIGSEGV, "SIGSEGV" }, \
1200 { VM_FAULT_NOPAGE, "NOPAGE" }, \
1201 { VM_FAULT_LOCKED, "LOCKED" }, \
1202 { VM_FAULT_RETRY, "RETRY" }, \
1203 { VM_FAULT_FALLBACK, "FALLBACK" }, \
1204 { VM_FAULT_DONE_COW, "DONE_COW" }
1206 /* Encode hstate index for a hwpoisoned large page */
1207 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1208 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1211 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1213 extern void pagefault_out_of_memory(void);
1215 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1218 * Flags passed to show_mem() and show_free_areas() to suppress output in
1221 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1223 extern void show_free_areas(unsigned int flags
, nodemask_t
*nodemask
);
1225 extern bool can_do_mlock(void);
1226 extern int user_shm_lock(size_t, struct user_struct
*);
1227 extern void user_shm_unlock(size_t, struct user_struct
*);
1230 * Parameter block passed down to zap_pte_range in exceptional cases.
1232 struct zap_details
{
1233 struct address_space
*check_mapping
; /* Check page->mapping if set */
1234 pgoff_t first_index
; /* Lowest page->index to unmap */
1235 pgoff_t last_index
; /* Highest page->index to unmap */
1238 struct page
*_vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
1239 pte_t pte
, bool with_public_device
);
1240 #define vm_normal_page(vma, addr, pte) _vm_normal_page(vma, addr, pte, false)
1242 struct page
*vm_normal_page_pmd(struct vm_area_struct
*vma
, unsigned long addr
,
1245 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
1246 unsigned long size
);
1247 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
1248 unsigned long size
);
1249 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
1250 unsigned long start
, unsigned long end
);
1253 * mm_walk - callbacks for walk_page_range
1254 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1255 * this handler should only handle pud_trans_huge() puds.
1256 * the pmd_entry or pte_entry callbacks will be used for
1258 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1259 * this handler is required to be able to handle
1260 * pmd_trans_huge() pmds. They may simply choose to
1261 * split_huge_page() instead of handling it explicitly.
1262 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1263 * @pte_hole: if set, called for each hole at all levels
1264 * @hugetlb_entry: if set, called for each hugetlb entry
1265 * @test_walk: caller specific callback function to determine whether
1266 * we walk over the current vma or not. Returning 0
1267 * value means "do page table walk over the current vma,"
1268 * and a negative one means "abort current page table walk
1269 * right now." 1 means "skip the current vma."
1270 * @mm: mm_struct representing the target process of page table walk
1271 * @vma: vma currently walked (NULL if walking outside vmas)
1272 * @private: private data for callbacks' usage
1274 * (see the comment on walk_page_range() for more details)
1277 int (*pud_entry
)(pud_t
*pud
, unsigned long addr
,
1278 unsigned long next
, struct mm_walk
*walk
);
1279 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
1280 unsigned long next
, struct mm_walk
*walk
);
1281 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
1282 unsigned long next
, struct mm_walk
*walk
);
1283 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
1284 struct mm_walk
*walk
);
1285 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
1286 unsigned long addr
, unsigned long next
,
1287 struct mm_walk
*walk
);
1288 int (*test_walk
)(unsigned long addr
, unsigned long next
,
1289 struct mm_walk
*walk
);
1290 struct mm_struct
*mm
;
1291 struct vm_area_struct
*vma
;
1295 int walk_page_range(unsigned long addr
, unsigned long end
,
1296 struct mm_walk
*walk
);
1297 int walk_page_vma(struct vm_area_struct
*vma
, struct mm_walk
*walk
);
1298 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1299 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1300 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1301 struct vm_area_struct
*vma
);
1302 void unmap_mapping_range(struct address_space
*mapping
,
1303 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1304 int follow_pte_pmd(struct mm_struct
*mm
, unsigned long address
,
1305 unsigned long *start
, unsigned long *end
,
1306 pte_t
**ptepp
, pmd_t
**pmdpp
, spinlock_t
**ptlp
);
1307 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1308 unsigned long *pfn
);
1309 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1310 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1311 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1312 void *buf
, int len
, int write
);
1314 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1315 loff_t
const holebegin
, loff_t
const holelen
)
1317 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1320 extern void truncate_pagecache(struct inode
*inode
, loff_t
new);
1321 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1322 void pagecache_isize_extended(struct inode
*inode
, loff_t from
, loff_t to
);
1323 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1324 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1325 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1326 int invalidate_inode_page(struct page
*page
);
1329 extern int handle_mm_fault(struct vm_area_struct
*vma
, unsigned long address
,
1330 unsigned int flags
);
1331 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1332 unsigned long address
, unsigned int fault_flags
,
1335 static inline int handle_mm_fault(struct vm_area_struct
*vma
,
1336 unsigned long address
, unsigned int flags
)
1338 /* should never happen if there's no MMU */
1340 return VM_FAULT_SIGBUS
;
1342 static inline int fixup_user_fault(struct task_struct
*tsk
,
1343 struct mm_struct
*mm
, unsigned long address
,
1344 unsigned int fault_flags
, bool *unlocked
)
1346 /* should never happen if there's no MMU */
1352 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
,
1353 unsigned int gup_flags
);
1354 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1355 void *buf
, int len
, unsigned int gup_flags
);
1356 extern int __access_remote_vm(struct task_struct
*tsk
, struct mm_struct
*mm
,
1357 unsigned long addr
, void *buf
, int len
, unsigned int gup_flags
);
1359 long get_user_pages_remote(struct task_struct
*tsk
, struct mm_struct
*mm
,
1360 unsigned long start
, unsigned long nr_pages
,
1361 unsigned int gup_flags
, struct page
**pages
,
1362 struct vm_area_struct
**vmas
, int *locked
);
1363 long get_user_pages(unsigned long start
, unsigned long nr_pages
,
1364 unsigned int gup_flags
, struct page
**pages
,
1365 struct vm_area_struct
**vmas
);
1366 long get_user_pages_locked(unsigned long start
, unsigned long nr_pages
,
1367 unsigned int gup_flags
, struct page
**pages
, int *locked
);
1368 long get_user_pages_unlocked(unsigned long start
, unsigned long nr_pages
,
1369 struct page
**pages
, unsigned int gup_flags
);
1370 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1371 struct page
**pages
);
1373 /* Container for pinned pfns / pages */
1374 struct frame_vector
{
1375 unsigned int nr_allocated
; /* Number of frames we have space for */
1376 unsigned int nr_frames
; /* Number of frames stored in ptrs array */
1377 bool got_ref
; /* Did we pin pages by getting page ref? */
1378 bool is_pfns
; /* Does array contain pages or pfns? */
1379 void *ptrs
[0]; /* Array of pinned pfns / pages. Use
1380 * pfns_vector_pages() or pfns_vector_pfns()
1384 struct frame_vector
*frame_vector_create(unsigned int nr_frames
);
1385 void frame_vector_destroy(struct frame_vector
*vec
);
1386 int get_vaddr_frames(unsigned long start
, unsigned int nr_pfns
,
1387 unsigned int gup_flags
, struct frame_vector
*vec
);
1388 void put_vaddr_frames(struct frame_vector
*vec
);
1389 int frame_vector_to_pages(struct frame_vector
*vec
);
1390 void frame_vector_to_pfns(struct frame_vector
*vec
);
1392 static inline unsigned int frame_vector_count(struct frame_vector
*vec
)
1394 return vec
->nr_frames
;
1397 static inline struct page
**frame_vector_pages(struct frame_vector
*vec
)
1400 int err
= frame_vector_to_pages(vec
);
1403 return ERR_PTR(err
);
1405 return (struct page
**)(vec
->ptrs
);
1408 static inline unsigned long *frame_vector_pfns(struct frame_vector
*vec
)
1411 frame_vector_to_pfns(vec
);
1412 return (unsigned long *)(vec
->ptrs
);
1416 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1417 struct page
**pages
);
1418 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1419 struct page
*get_dump_page(unsigned long addr
);
1421 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1422 extern void do_invalidatepage(struct page
*page
, unsigned int offset
,
1423 unsigned int length
);
1425 int __set_page_dirty_nobuffers(struct page
*page
);
1426 int __set_page_dirty_no_writeback(struct page
*page
);
1427 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1429 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1430 void account_page_cleaned(struct page
*page
, struct address_space
*mapping
,
1431 struct bdi_writeback
*wb
);
1432 int set_page_dirty(struct page
*page
);
1433 int set_page_dirty_lock(struct page
*page
);
1434 void cancel_dirty_page(struct page
*page
);
1435 int clear_page_dirty_for_io(struct page
*page
);
1437 int get_cmdline(struct task_struct
*task
, char *buffer
, int buflen
);
1439 static inline bool vma_is_anonymous(struct vm_area_struct
*vma
)
1441 return !vma
->vm_ops
;
1446 * The vma_is_shmem is not inline because it is used only by slow
1447 * paths in userfault.
1449 bool vma_is_shmem(struct vm_area_struct
*vma
);
1451 static inline bool vma_is_shmem(struct vm_area_struct
*vma
) { return false; }
1454 int vma_is_stack_for_current(struct vm_area_struct
*vma
);
1456 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1457 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1458 unsigned long new_addr
, unsigned long len
,
1459 bool need_rmap_locks
);
1460 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1461 unsigned long end
, pgprot_t newprot
,
1462 int dirty_accountable
, int prot_numa
);
1463 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1464 struct vm_area_struct
**pprev
, unsigned long start
,
1465 unsigned long end
, unsigned long newflags
);
1468 * doesn't attempt to fault and will return short.
1470 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1471 struct page
**pages
);
1473 * per-process(per-mm_struct) statistics.
1475 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1477 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1479 #ifdef SPLIT_RSS_COUNTING
1481 * counter is updated in asynchronous manner and may go to minus.
1482 * But it's never be expected number for users.
1487 return (unsigned long)val
;
1490 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1492 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1495 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1497 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1500 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1502 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1505 /* Optimized variant when page is already known not to be PageAnon */
1506 static inline int mm_counter_file(struct page
*page
)
1508 if (PageSwapBacked(page
))
1509 return MM_SHMEMPAGES
;
1510 return MM_FILEPAGES
;
1513 static inline int mm_counter(struct page
*page
)
1516 return MM_ANONPAGES
;
1517 return mm_counter_file(page
);
1520 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1522 return get_mm_counter(mm
, MM_FILEPAGES
) +
1523 get_mm_counter(mm
, MM_ANONPAGES
) +
1524 get_mm_counter(mm
, MM_SHMEMPAGES
);
1527 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1529 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1532 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1534 return max(mm
->hiwater_vm
, mm
->total_vm
);
1537 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1539 unsigned long _rss
= get_mm_rss(mm
);
1541 if ((mm
)->hiwater_rss
< _rss
)
1542 (mm
)->hiwater_rss
= _rss
;
1545 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1547 if (mm
->hiwater_vm
< mm
->total_vm
)
1548 mm
->hiwater_vm
= mm
->total_vm
;
1551 static inline void reset_mm_hiwater_rss(struct mm_struct
*mm
)
1553 mm
->hiwater_rss
= get_mm_rss(mm
);
1556 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1557 struct mm_struct
*mm
)
1559 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1561 if (*maxrss
< hiwater_rss
)
1562 *maxrss
= hiwater_rss
;
1565 #if defined(SPLIT_RSS_COUNTING)
1566 void sync_mm_rss(struct mm_struct
*mm
);
1568 static inline void sync_mm_rss(struct mm_struct
*mm
)
1573 #ifndef __HAVE_ARCH_PTE_DEVMAP
1574 static inline int pte_devmap(pte_t pte
)
1580 int vma_wants_writenotify(struct vm_area_struct
*vma
, pgprot_t vm_page_prot
);
1582 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1584 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1588 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1592 #ifdef __PAGETABLE_P4D_FOLDED
1593 static inline int __p4d_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1594 unsigned long address
)
1599 int __p4d_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1602 #ifdef __PAGETABLE_PUD_FOLDED
1603 static inline int __pud_alloc(struct mm_struct
*mm
, p4d_t
*p4d
,
1604 unsigned long address
)
1609 int __pud_alloc(struct mm_struct
*mm
, p4d_t
*p4d
, unsigned long address
);
1612 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1613 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1614 unsigned long address
)
1619 static inline void mm_nr_pmds_init(struct mm_struct
*mm
) {}
1621 static inline unsigned long mm_nr_pmds(struct mm_struct
*mm
)
1626 static inline void mm_inc_nr_pmds(struct mm_struct
*mm
) {}
1627 static inline void mm_dec_nr_pmds(struct mm_struct
*mm
) {}
1630 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1632 static inline void mm_nr_pmds_init(struct mm_struct
*mm
)
1634 atomic_long_set(&mm
->nr_pmds
, 0);
1637 static inline unsigned long mm_nr_pmds(struct mm_struct
*mm
)
1639 return atomic_long_read(&mm
->nr_pmds
);
1642 static inline void mm_inc_nr_pmds(struct mm_struct
*mm
)
1644 atomic_long_inc(&mm
->nr_pmds
);
1647 static inline void mm_dec_nr_pmds(struct mm_struct
*mm
)
1649 atomic_long_dec(&mm
->nr_pmds
);
1653 int __pte_alloc(struct mm_struct
*mm
, pmd_t
*pmd
, unsigned long address
);
1654 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1657 * The following ifdef needed to get the 4level-fixup.h header to work.
1658 * Remove it when 4level-fixup.h has been removed.
1660 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1662 #ifndef __ARCH_HAS_5LEVEL_HACK
1663 static inline p4d_t
*p4d_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1664 unsigned long address
)
1666 return (unlikely(pgd_none(*pgd
)) && __p4d_alloc(mm
, pgd
, address
)) ?
1667 NULL
: p4d_offset(pgd
, address
);
1670 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, p4d_t
*p4d
,
1671 unsigned long address
)
1673 return (unlikely(p4d_none(*p4d
)) && __pud_alloc(mm
, p4d
, address
)) ?
1674 NULL
: pud_offset(p4d
, address
);
1676 #endif /* !__ARCH_HAS_5LEVEL_HACK */
1678 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1680 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1681 NULL
: pmd_offset(pud
, address
);
1683 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1685 #if USE_SPLIT_PTE_PTLOCKS
1686 #if ALLOC_SPLIT_PTLOCKS
1687 void __init
ptlock_cache_init(void);
1688 extern bool ptlock_alloc(struct page
*page
);
1689 extern void ptlock_free(struct page
*page
);
1691 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1695 #else /* ALLOC_SPLIT_PTLOCKS */
1696 static inline void ptlock_cache_init(void)
1700 static inline bool ptlock_alloc(struct page
*page
)
1705 static inline void ptlock_free(struct page
*page
)
1709 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1713 #endif /* ALLOC_SPLIT_PTLOCKS */
1715 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1717 return ptlock_ptr(pmd_page(*pmd
));
1720 static inline bool ptlock_init(struct page
*page
)
1723 * prep_new_page() initialize page->private (and therefore page->ptl)
1724 * with 0. Make sure nobody took it in use in between.
1726 * It can happen if arch try to use slab for page table allocation:
1727 * slab code uses page->slab_cache, which share storage with page->ptl.
1729 VM_BUG_ON_PAGE(*(unsigned long *)&page
->ptl
, page
);
1730 if (!ptlock_alloc(page
))
1732 spin_lock_init(ptlock_ptr(page
));
1736 /* Reset page->mapping so free_pages_check won't complain. */
1737 static inline void pte_lock_deinit(struct page
*page
)
1739 page
->mapping
= NULL
;
1743 #else /* !USE_SPLIT_PTE_PTLOCKS */
1745 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1747 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1749 return &mm
->page_table_lock
;
1751 static inline void ptlock_cache_init(void) {}
1752 static inline bool ptlock_init(struct page
*page
) { return true; }
1753 static inline void pte_lock_deinit(struct page
*page
) {}
1754 #endif /* USE_SPLIT_PTE_PTLOCKS */
1756 static inline void pgtable_init(void)
1758 ptlock_cache_init();
1759 pgtable_cache_init();
1762 static inline bool pgtable_page_ctor(struct page
*page
)
1764 if (!ptlock_init(page
))
1766 inc_zone_page_state(page
, NR_PAGETABLE
);
1770 static inline void pgtable_page_dtor(struct page
*page
)
1772 pte_lock_deinit(page
);
1773 dec_zone_page_state(page
, NR_PAGETABLE
);
1776 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1778 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1779 pte_t *__pte = pte_offset_map(pmd, address); \
1785 #define pte_unmap_unlock(pte, ptl) do { \
1790 #define pte_alloc(mm, pmd, address) \
1791 (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd, address))
1793 #define pte_alloc_map(mm, pmd, address) \
1794 (pte_alloc(mm, pmd, address) ? NULL : pte_offset_map(pmd, address))
1796 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1797 (pte_alloc(mm, pmd, address) ? \
1798 NULL : pte_offset_map_lock(mm, pmd, address, ptlp))
1800 #define pte_alloc_kernel(pmd, address) \
1801 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1802 NULL: pte_offset_kernel(pmd, address))
1804 #if USE_SPLIT_PMD_PTLOCKS
1806 static struct page
*pmd_to_page(pmd_t
*pmd
)
1808 unsigned long mask
= ~(PTRS_PER_PMD
* sizeof(pmd_t
) - 1);
1809 return virt_to_page((void *)((unsigned long) pmd
& mask
));
1812 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1814 return ptlock_ptr(pmd_to_page(pmd
));
1817 static inline bool pgtable_pmd_page_ctor(struct page
*page
)
1819 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1820 page
->pmd_huge_pte
= NULL
;
1822 return ptlock_init(page
);
1825 static inline void pgtable_pmd_page_dtor(struct page
*page
)
1827 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1828 VM_BUG_ON_PAGE(page
->pmd_huge_pte
, page
);
1833 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1837 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1839 return &mm
->page_table_lock
;
1842 static inline bool pgtable_pmd_page_ctor(struct page
*page
) { return true; }
1843 static inline void pgtable_pmd_page_dtor(struct page
*page
) {}
1845 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1849 static inline spinlock_t
*pmd_lock(struct mm_struct
*mm
, pmd_t
*pmd
)
1851 spinlock_t
*ptl
= pmd_lockptr(mm
, pmd
);
1857 * No scalability reason to split PUD locks yet, but follow the same pattern
1858 * as the PMD locks to make it easier if we decide to. The VM should not be
1859 * considered ready to switch to split PUD locks yet; there may be places
1860 * which need to be converted from page_table_lock.
1862 static inline spinlock_t
*pud_lockptr(struct mm_struct
*mm
, pud_t
*pud
)
1864 return &mm
->page_table_lock
;
1867 static inline spinlock_t
*pud_lock(struct mm_struct
*mm
, pud_t
*pud
)
1869 spinlock_t
*ptl
= pud_lockptr(mm
, pud
);
1875 extern void __init
pagecache_init(void);
1876 extern void free_area_init(unsigned long * zones_size
);
1877 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1878 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1879 extern void free_initmem(void);
1882 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1883 * into the buddy system. The freed pages will be poisoned with pattern
1884 * "poison" if it's within range [0, UCHAR_MAX].
1885 * Return pages freed into the buddy system.
1887 extern unsigned long free_reserved_area(void *start
, void *end
,
1888 int poison
, char *s
);
1890 #ifdef CONFIG_HIGHMEM
1892 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1893 * and totalram_pages.
1895 extern void free_highmem_page(struct page
*page
);
1898 extern void adjust_managed_page_count(struct page
*page
, long count
);
1899 extern void mem_init_print_info(const char *str
);
1901 extern void reserve_bootmem_region(phys_addr_t start
, phys_addr_t end
);
1903 /* Free the reserved page into the buddy system, so it gets managed. */
1904 static inline void __free_reserved_page(struct page
*page
)
1906 ClearPageReserved(page
);
1907 init_page_count(page
);
1911 static inline void free_reserved_page(struct page
*page
)
1913 __free_reserved_page(page
);
1914 adjust_managed_page_count(page
, 1);
1917 static inline void mark_page_reserved(struct page
*page
)
1919 SetPageReserved(page
);
1920 adjust_managed_page_count(page
, -1);
1924 * Default method to free all the __init memory into the buddy system.
1925 * The freed pages will be poisoned with pattern "poison" if it's within
1926 * range [0, UCHAR_MAX].
1927 * Return pages freed into the buddy system.
1929 static inline unsigned long free_initmem_default(int poison
)
1931 extern char __init_begin
[], __init_end
[];
1933 return free_reserved_area(&__init_begin
, &__init_end
,
1934 poison
, "unused kernel");
1937 static inline unsigned long get_num_physpages(void)
1940 unsigned long phys_pages
= 0;
1942 for_each_online_node(nid
)
1943 phys_pages
+= node_present_pages(nid
);
1948 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1950 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1951 * zones, allocate the backing mem_map and account for memory holes in a more
1952 * architecture independent manner. This is a substitute for creating the
1953 * zone_sizes[] and zholes_size[] arrays and passing them to
1954 * free_area_init_node()
1956 * An architecture is expected to register range of page frames backed by
1957 * physical memory with memblock_add[_node]() before calling
1958 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1959 * usage, an architecture is expected to do something like
1961 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1963 * for_each_valid_physical_page_range()
1964 * memblock_add_node(base, size, nid)
1965 * free_area_init_nodes(max_zone_pfns);
1967 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1968 * registered physical page range. Similarly
1969 * sparse_memory_present_with_active_regions() calls memory_present() for
1970 * each range when SPARSEMEM is enabled.
1972 * See mm/page_alloc.c for more information on each function exposed by
1973 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1975 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1976 unsigned long node_map_pfn_alignment(void);
1977 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1978 unsigned long end_pfn
);
1979 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1980 unsigned long end_pfn
);
1981 extern void get_pfn_range_for_nid(unsigned int nid
,
1982 unsigned long *start_pfn
, unsigned long *end_pfn
);
1983 extern unsigned long find_min_pfn_with_active_regions(void);
1984 extern void free_bootmem_with_active_regions(int nid
,
1985 unsigned long max_low_pfn
);
1986 extern void sparse_memory_present_with_active_regions(int nid
);
1988 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1990 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1991 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1992 static inline int __early_pfn_to_nid(unsigned long pfn
,
1993 struct mminit_pfnnid_cache
*state
)
1998 /* please see mm/page_alloc.c */
1999 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
2000 /* there is a per-arch backend function. */
2001 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
,
2002 struct mminit_pfnnid_cache
*state
);
2005 extern void set_dma_reserve(unsigned long new_dma_reserve
);
2006 extern void memmap_init_zone(unsigned long, int, unsigned long,
2007 unsigned long, enum memmap_context
);
2008 extern void setup_per_zone_wmarks(void);
2009 extern int __meminit
init_per_zone_wmark_min(void);
2010 extern void mem_init(void);
2011 extern void __init
mmap_init(void);
2012 extern void show_mem(unsigned int flags
, nodemask_t
*nodemask
);
2013 extern long si_mem_available(void);
2014 extern void si_meminfo(struct sysinfo
* val
);
2015 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
2016 #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES
2017 extern unsigned long arch_reserved_kernel_pages(void);
2020 extern __printf(3, 4)
2021 void warn_alloc(gfp_t gfp_mask
, nodemask_t
*nodemask
, const char *fmt
, ...);
2023 extern void setup_per_cpu_pageset(void);
2025 extern void zone_pcp_update(struct zone
*zone
);
2026 extern void zone_pcp_reset(struct zone
*zone
);
2029 extern int min_free_kbytes
;
2030 extern int watermark_scale_factor
;
2033 extern atomic_long_t mmap_pages_allocated
;
2034 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
2036 /* interval_tree.c */
2037 void vma_interval_tree_insert(struct vm_area_struct
*node
,
2038 struct rb_root_cached
*root
);
2039 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
2040 struct vm_area_struct
*prev
,
2041 struct rb_root_cached
*root
);
2042 void vma_interval_tree_remove(struct vm_area_struct
*node
,
2043 struct rb_root_cached
*root
);
2044 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root_cached
*root
,
2045 unsigned long start
, unsigned long last
);
2046 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
2047 unsigned long start
, unsigned long last
);
2049 #define vma_interval_tree_foreach(vma, root, start, last) \
2050 for (vma = vma_interval_tree_iter_first(root, start, last); \
2051 vma; vma = vma_interval_tree_iter_next(vma, start, last))
2053 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
2054 struct rb_root_cached
*root
);
2055 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
2056 struct rb_root_cached
*root
);
2057 struct anon_vma_chain
*
2058 anon_vma_interval_tree_iter_first(struct rb_root_cached
*root
,
2059 unsigned long start
, unsigned long last
);
2060 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
2061 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
2062 #ifdef CONFIG_DEBUG_VM_RB
2063 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
2066 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
2067 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
2068 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
2071 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
2072 extern int __vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
2073 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
,
2074 struct vm_area_struct
*expand
);
2075 static inline int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
2076 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
)
2078 return __vma_adjust(vma
, start
, end
, pgoff
, insert
, NULL
);
2080 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
2081 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
2082 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
2083 struct mempolicy
*, struct vm_userfaultfd_ctx
);
2084 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
2085 extern int __split_vma(struct mm_struct
*, struct vm_area_struct
*,
2086 unsigned long addr
, int new_below
);
2087 extern int split_vma(struct mm_struct
*, struct vm_area_struct
*,
2088 unsigned long addr
, int new_below
);
2089 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
2090 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
2091 struct rb_node
**, struct rb_node
*);
2092 extern void unlink_file_vma(struct vm_area_struct
*);
2093 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
2094 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
2095 bool *need_rmap_locks
);
2096 extern void exit_mmap(struct mm_struct
*);
2098 static inline int check_data_rlimit(unsigned long rlim
,
2100 unsigned long start
,
2101 unsigned long end_data
,
2102 unsigned long start_data
)
2104 if (rlim
< RLIM_INFINITY
) {
2105 if (((new - start
) + (end_data
- start_data
)) > rlim
)
2112 extern int mm_take_all_locks(struct mm_struct
*mm
);
2113 extern void mm_drop_all_locks(struct mm_struct
*mm
);
2115 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
2116 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
2117 extern struct file
*get_task_exe_file(struct task_struct
*task
);
2119 extern bool may_expand_vm(struct mm_struct
*, vm_flags_t
, unsigned long npages
);
2120 extern void vm_stat_account(struct mm_struct
*, vm_flags_t
, long npages
);
2122 extern bool vma_is_special_mapping(const struct vm_area_struct
*vma
,
2123 const struct vm_special_mapping
*sm
);
2124 extern struct vm_area_struct
*_install_special_mapping(struct mm_struct
*mm
,
2125 unsigned long addr
, unsigned long len
,
2126 unsigned long flags
,
2127 const struct vm_special_mapping
*spec
);
2128 /* This is an obsolete alternative to _install_special_mapping. */
2129 extern int install_special_mapping(struct mm_struct
*mm
,
2130 unsigned long addr
, unsigned long len
,
2131 unsigned long flags
, struct page
**pages
);
2133 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
2135 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
2136 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
,
2137 struct list_head
*uf
);
2138 extern unsigned long do_mmap(struct file
*file
, unsigned long addr
,
2139 unsigned long len
, unsigned long prot
, unsigned long flags
,
2140 vm_flags_t vm_flags
, unsigned long pgoff
, unsigned long *populate
,
2141 struct list_head
*uf
);
2142 extern int do_munmap(struct mm_struct
*, unsigned long, size_t,
2143 struct list_head
*uf
);
2145 static inline unsigned long
2146 do_mmap_pgoff(struct file
*file
, unsigned long addr
,
2147 unsigned long len
, unsigned long prot
, unsigned long flags
,
2148 unsigned long pgoff
, unsigned long *populate
,
2149 struct list_head
*uf
)
2151 return do_mmap(file
, addr
, len
, prot
, flags
, 0, pgoff
, populate
, uf
);
2155 extern int __mm_populate(unsigned long addr
, unsigned long len
,
2157 static inline void mm_populate(unsigned long addr
, unsigned long len
)
2160 (void) __mm_populate(addr
, len
, 1);
2163 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
2166 /* These take the mm semaphore themselves */
2167 extern int __must_check
vm_brk(unsigned long, unsigned long);
2168 extern int __must_check
vm_brk_flags(unsigned long, unsigned long, unsigned long);
2169 extern int vm_munmap(unsigned long, size_t);
2170 extern unsigned long __must_check
vm_mmap(struct file
*, unsigned long,
2171 unsigned long, unsigned long,
2172 unsigned long, unsigned long);
2174 struct vm_unmapped_area_info
{
2175 #define VM_UNMAPPED_AREA_TOPDOWN 1
2176 unsigned long flags
;
2177 unsigned long length
;
2178 unsigned long low_limit
;
2179 unsigned long high_limit
;
2180 unsigned long align_mask
;
2181 unsigned long align_offset
;
2184 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
2185 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
2188 * Search for an unmapped address range.
2190 * We are looking for a range that:
2191 * - does not intersect with any VMA;
2192 * - is contained within the [low_limit, high_limit) interval;
2193 * - is at least the desired size.
2194 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
2196 static inline unsigned long
2197 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
2199 if (info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
)
2200 return unmapped_area_topdown(info
);
2202 return unmapped_area(info
);
2206 extern void truncate_inode_pages(struct address_space
*, loff_t
);
2207 extern void truncate_inode_pages_range(struct address_space
*,
2208 loff_t lstart
, loff_t lend
);
2209 extern void truncate_inode_pages_final(struct address_space
*);
2211 /* generic vm_area_ops exported for stackable file systems */
2212 extern int filemap_fault(struct vm_fault
*vmf
);
2213 extern void filemap_map_pages(struct vm_fault
*vmf
,
2214 pgoff_t start_pgoff
, pgoff_t end_pgoff
);
2215 extern int filemap_page_mkwrite(struct vm_fault
*vmf
);
2217 /* mm/page-writeback.c */
2218 int __must_check
write_one_page(struct page
*page
);
2219 void task_dirty_inc(struct task_struct
*tsk
);
2222 #define VM_MAX_READAHEAD 128 /* kbytes */
2223 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
2225 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
2226 pgoff_t offset
, unsigned long nr_to_read
);
2228 void page_cache_sync_readahead(struct address_space
*mapping
,
2229 struct file_ra_state
*ra
,
2232 unsigned long size
);
2234 void page_cache_async_readahead(struct address_space
*mapping
,
2235 struct file_ra_state
*ra
,
2239 unsigned long size
);
2241 extern unsigned long stack_guard_gap
;
2242 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
2243 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
2245 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
2246 extern int expand_downwards(struct vm_area_struct
*vma
,
2247 unsigned long address
);
2249 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
2251 #define expand_upwards(vma, address) (0)
2254 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
2255 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
2256 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
2257 struct vm_area_struct
**pprev
);
2259 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
2260 NULL if none. Assume start_addr < end_addr. */
2261 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
2263 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
2265 if (vma
&& end_addr
<= vma
->vm_start
)
2270 static inline unsigned long vm_start_gap(struct vm_area_struct
*vma
)
2272 unsigned long vm_start
= vma
->vm_start
;
2274 if (vma
->vm_flags
& VM_GROWSDOWN
) {
2275 vm_start
-= stack_guard_gap
;
2276 if (vm_start
> vma
->vm_start
)
2282 static inline unsigned long vm_end_gap(struct vm_area_struct
*vma
)
2284 unsigned long vm_end
= vma
->vm_end
;
2286 if (vma
->vm_flags
& VM_GROWSUP
) {
2287 vm_end
+= stack_guard_gap
;
2288 if (vm_end
< vma
->vm_end
)
2289 vm_end
= -PAGE_SIZE
;
2294 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
2296 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
2299 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2300 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
2301 unsigned long vm_start
, unsigned long vm_end
)
2303 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
2305 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
2312 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
2313 void vma_set_page_prot(struct vm_area_struct
*vma
);
2315 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
2319 static inline void vma_set_page_prot(struct vm_area_struct
*vma
)
2321 vma
->vm_page_prot
= vm_get_page_prot(vma
->vm_flags
);
2325 #ifdef CONFIG_NUMA_BALANCING
2326 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
2327 unsigned long start
, unsigned long end
);
2330 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
2331 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
2332 unsigned long pfn
, unsigned long size
, pgprot_t
);
2333 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
2334 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
2336 int vm_insert_pfn_prot(struct vm_area_struct
*vma
, unsigned long addr
,
2337 unsigned long pfn
, pgprot_t pgprot
);
2338 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
2340 int vm_insert_mixed_mkwrite(struct vm_area_struct
*vma
, unsigned long addr
,
2342 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
2345 struct page
*follow_page_mask(struct vm_area_struct
*vma
,
2346 unsigned long address
, unsigned int foll_flags
,
2347 unsigned int *page_mask
);
2349 static inline struct page
*follow_page(struct vm_area_struct
*vma
,
2350 unsigned long address
, unsigned int foll_flags
)
2352 unsigned int unused_page_mask
;
2353 return follow_page_mask(vma
, address
, foll_flags
, &unused_page_mask
);
2356 #define FOLL_WRITE 0x01 /* check pte is writable */
2357 #define FOLL_TOUCH 0x02 /* mark page accessed */
2358 #define FOLL_GET 0x04 /* do get_page on page */
2359 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2360 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2361 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2362 * and return without waiting upon it */
2363 #define FOLL_POPULATE 0x40 /* fault in page */
2364 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2365 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2366 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2367 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2368 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2369 #define FOLL_MLOCK 0x1000 /* lock present pages */
2370 #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */
2371 #define FOLL_COW 0x4000 /* internal GUP flag */
2373 static inline int vm_fault_to_errno(int vm_fault
, int foll_flags
)
2375 if (vm_fault
& VM_FAULT_OOM
)
2377 if (vm_fault
& (VM_FAULT_HWPOISON
| VM_FAULT_HWPOISON_LARGE
))
2378 return (foll_flags
& FOLL_HWPOISON
) ? -EHWPOISON
: -EFAULT
;
2379 if (vm_fault
& (VM_FAULT_SIGBUS
| VM_FAULT_SIGSEGV
))
2384 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
2386 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
2387 unsigned long size
, pte_fn_t fn
, void *data
);
2390 #ifdef CONFIG_PAGE_POISONING
2391 extern bool page_poisoning_enabled(void);
2392 extern void kernel_poison_pages(struct page
*page
, int numpages
, int enable
);
2393 extern bool page_is_poisoned(struct page
*page
);
2395 static inline bool page_poisoning_enabled(void) { return false; }
2396 static inline void kernel_poison_pages(struct page
*page
, int numpages
,
2398 static inline bool page_is_poisoned(struct page
*page
) { return false; }
2401 #ifdef CONFIG_DEBUG_PAGEALLOC
2402 extern bool _debug_pagealloc_enabled
;
2403 extern void __kernel_map_pages(struct page
*page
, int numpages
, int enable
);
2405 static inline bool debug_pagealloc_enabled(void)
2407 return _debug_pagealloc_enabled
;
2411 kernel_map_pages(struct page
*page
, int numpages
, int enable
)
2413 if (!debug_pagealloc_enabled())
2416 __kernel_map_pages(page
, numpages
, enable
);
2418 #ifdef CONFIG_HIBERNATION
2419 extern bool kernel_page_present(struct page
*page
);
2420 #endif /* CONFIG_HIBERNATION */
2421 #else /* CONFIG_DEBUG_PAGEALLOC */
2423 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
2424 #ifdef CONFIG_HIBERNATION
2425 static inline bool kernel_page_present(struct page
*page
) { return true; }
2426 #endif /* CONFIG_HIBERNATION */
2427 static inline bool debug_pagealloc_enabled(void)
2431 #endif /* CONFIG_DEBUG_PAGEALLOC */
2433 #ifdef __HAVE_ARCH_GATE_AREA
2434 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
2435 extern int in_gate_area_no_mm(unsigned long addr
);
2436 extern int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
2438 static inline struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
)
2442 static inline int in_gate_area_no_mm(unsigned long addr
) { return 0; }
2443 static inline int in_gate_area(struct mm_struct
*mm
, unsigned long addr
)
2447 #endif /* __HAVE_ARCH_GATE_AREA */
2449 extern bool process_shares_mm(struct task_struct
*p
, struct mm_struct
*mm
);
2451 #ifdef CONFIG_SYSCTL
2452 extern int sysctl_drop_caches
;
2453 int drop_caches_sysctl_handler(struct ctl_table
*, int,
2454 void __user
*, size_t *, loff_t
*);
2457 void drop_slab(void);
2458 void drop_slab_node(int nid
);
2461 #define randomize_va_space 0
2463 extern int randomize_va_space
;
2466 const char * arch_vma_name(struct vm_area_struct
*vma
);
2467 void print_vma_addr(char *prefix
, unsigned long rip
);
2469 void sparse_mem_maps_populate_node(struct page
**map_map
,
2470 unsigned long pnum_begin
,
2471 unsigned long pnum_end
,
2472 unsigned long map_count
,
2475 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
2476 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
2477 p4d_t
*vmemmap_p4d_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
2478 pud_t
*vmemmap_pud_populate(p4d_t
*p4d
, unsigned long addr
, int node
);
2479 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
2480 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
2481 void *vmemmap_alloc_block(unsigned long size
, int node
);
2483 void *__vmemmap_alloc_block_buf(unsigned long size
, int node
,
2484 struct vmem_altmap
*altmap
);
2485 static inline void *vmemmap_alloc_block_buf(unsigned long size
, int node
)
2487 return __vmemmap_alloc_block_buf(size
, node
, NULL
);
2490 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
2491 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
2493 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
);
2494 void vmemmap_populate_print_last(void);
2495 #ifdef CONFIG_MEMORY_HOTPLUG
2496 void vmemmap_free(unsigned long start
, unsigned long end
);
2498 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
2499 unsigned long size
);
2502 MF_COUNT_INCREASED
= 1 << 0,
2503 MF_ACTION_REQUIRED
= 1 << 1,
2504 MF_MUST_KILL
= 1 << 2,
2505 MF_SOFT_OFFLINE
= 1 << 3,
2507 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
2508 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
2509 extern int unpoison_memory(unsigned long pfn
);
2510 extern int get_hwpoison_page(struct page
*page
);
2511 #define put_hwpoison_page(page) put_page(page)
2512 extern int sysctl_memory_failure_early_kill
;
2513 extern int sysctl_memory_failure_recovery
;
2514 extern void shake_page(struct page
*p
, int access
);
2515 extern atomic_long_t num_poisoned_pages
;
2516 extern int soft_offline_page(struct page
*page
, int flags
);
2520 * Error handlers for various types of pages.
2523 MF_IGNORED
, /* Error: cannot be handled */
2524 MF_FAILED
, /* Error: handling failed */
2525 MF_DELAYED
, /* Will be handled later */
2526 MF_RECOVERED
, /* Successfully recovered */
2529 enum mf_action_page_type
{
2531 MF_MSG_KERNEL_HIGH_ORDER
,
2533 MF_MSG_DIFFERENT_COMPOUND
,
2534 MF_MSG_POISONED_HUGE
,
2537 MF_MSG_UNMAP_FAILED
,
2538 MF_MSG_DIRTY_SWAPCACHE
,
2539 MF_MSG_CLEAN_SWAPCACHE
,
2540 MF_MSG_DIRTY_MLOCKED_LRU
,
2541 MF_MSG_CLEAN_MLOCKED_LRU
,
2542 MF_MSG_DIRTY_UNEVICTABLE_LRU
,
2543 MF_MSG_CLEAN_UNEVICTABLE_LRU
,
2546 MF_MSG_TRUNCATED_LRU
,
2552 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2553 extern void clear_huge_page(struct page
*page
,
2554 unsigned long addr_hint
,
2555 unsigned int pages_per_huge_page
);
2556 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
2557 unsigned long addr
, struct vm_area_struct
*vma
,
2558 unsigned int pages_per_huge_page
);
2559 extern long copy_huge_page_from_user(struct page
*dst_page
,
2560 const void __user
*usr_src
,
2561 unsigned int pages_per_huge_page
,
2562 bool allow_pagefault
);
2563 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2565 extern struct page_ext_operations debug_guardpage_ops
;
2567 #ifdef CONFIG_DEBUG_PAGEALLOC
2568 extern unsigned int _debug_guardpage_minorder
;
2569 extern bool _debug_guardpage_enabled
;
2571 static inline unsigned int debug_guardpage_minorder(void)
2573 return _debug_guardpage_minorder
;
2576 static inline bool debug_guardpage_enabled(void)
2578 return _debug_guardpage_enabled
;
2581 static inline bool page_is_guard(struct page
*page
)
2583 struct page_ext
*page_ext
;
2585 if (!debug_guardpage_enabled())
2588 page_ext
= lookup_page_ext(page
);
2589 if (unlikely(!page_ext
))
2592 return test_bit(PAGE_EXT_DEBUG_GUARD
, &page_ext
->flags
);
2595 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2596 static inline bool debug_guardpage_enabled(void) { return false; }
2597 static inline bool page_is_guard(struct page
*page
) { return false; }
2598 #endif /* CONFIG_DEBUG_PAGEALLOC */
2600 #if MAX_NUMNODES > 1
2601 void __init
setup_nr_node_ids(void);
2603 static inline void setup_nr_node_ids(void) {}
2606 #endif /* __KERNEL__ */
2607 #endif /* _LINUX_MM_H */