4 #include <linux/errno.h>
8 #include <linux/mmdebug.h>
10 #include <linux/bug.h>
11 #include <linux/list.h>
12 #include <linux/mmzone.h>
13 #include <linux/rbtree.h>
14 #include <linux/atomic.h>
15 #include <linux/debug_locks.h>
16 #include <linux/mm_types.h>
17 #include <linux/range.h>
18 #include <linux/pfn.h>
19 #include <linux/percpu-refcount.h>
20 #include <linux/bit_spinlock.h>
21 #include <linux/shrinker.h>
22 #include <linux/resource.h>
23 #include <linux/page_ext.h>
24 #include <linux/err.h>
28 struct anon_vma_chain
;
31 struct writeback_control
;
34 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
35 extern unsigned long max_mapnr
;
37 static inline void set_max_mapnr(unsigned long limit
)
42 static inline void set_max_mapnr(unsigned long limit
) { }
45 extern unsigned long totalram_pages
;
46 extern void * high_memory
;
47 extern int page_cluster
;
50 extern int sysctl_legacy_va_layout
;
52 #define sysctl_legacy_va_layout 0
55 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
56 extern const int mmap_rnd_bits_min
;
57 extern const int mmap_rnd_bits_max
;
58 extern int mmap_rnd_bits __read_mostly
;
60 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
61 extern const int mmap_rnd_compat_bits_min
;
62 extern const int mmap_rnd_compat_bits_max
;
63 extern int mmap_rnd_compat_bits __read_mostly
;
67 #include <asm/pgtable.h>
68 #include <asm/processor.h>
71 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
75 * To prevent common memory management code establishing
76 * a zero page mapping on a read fault.
77 * This macro should be defined within <asm/pgtable.h>.
78 * s390 does this to prevent multiplexing of hardware bits
79 * related to the physical page in case of virtualization.
81 #ifndef mm_forbids_zeropage
82 #define mm_forbids_zeropage(X) (0)
85 extern unsigned long sysctl_user_reserve_kbytes
;
86 extern unsigned long sysctl_admin_reserve_kbytes
;
88 extern int sysctl_overcommit_memory
;
89 extern int sysctl_overcommit_ratio
;
90 extern unsigned long sysctl_overcommit_kbytes
;
92 extern int overcommit_ratio_handler(struct ctl_table
*, int, void __user
*,
94 extern int overcommit_kbytes_handler(struct ctl_table
*, int, void __user
*,
97 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
99 /* to align the pointer to the (next) page boundary */
100 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
102 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
103 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
106 * Linux kernel virtual memory manager primitives.
107 * The idea being to have a "virtual" mm in the same way
108 * we have a virtual fs - giving a cleaner interface to the
109 * mm details, and allowing different kinds of memory mappings
110 * (from shared memory to executable loading to arbitrary
114 extern struct kmem_cache
*vm_area_cachep
;
117 extern struct rb_root nommu_region_tree
;
118 extern struct rw_semaphore nommu_region_sem
;
120 extern unsigned int kobjsize(const void *objp
);
124 * vm_flags in vm_area_struct, see mm_types.h.
126 #define VM_NONE 0x00000000
128 #define VM_READ 0x00000001 /* currently active flags */
129 #define VM_WRITE 0x00000002
130 #define VM_EXEC 0x00000004
131 #define VM_SHARED 0x00000008
133 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
134 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
135 #define VM_MAYWRITE 0x00000020
136 #define VM_MAYEXEC 0x00000040
137 #define VM_MAYSHARE 0x00000080
139 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
140 #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
141 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
142 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
143 #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
145 #define VM_LOCKED 0x00002000
146 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
148 /* Used by sys_madvise() */
149 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
150 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
152 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
153 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
154 #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
155 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
156 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
157 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
158 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
159 #define VM_ARCH_2 0x02000000
160 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
162 #ifdef CONFIG_MEM_SOFT_DIRTY
163 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
165 # define VM_SOFTDIRTY 0
168 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
169 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
170 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
171 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
173 #if defined(CONFIG_X86)
174 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
175 #elif defined(CONFIG_PPC)
176 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
177 #elif defined(CONFIG_PARISC)
178 # define VM_GROWSUP VM_ARCH_1
179 #elif defined(CONFIG_METAG)
180 # define VM_GROWSUP VM_ARCH_1
181 #elif defined(CONFIG_IA64)
182 # define VM_GROWSUP VM_ARCH_1
183 #elif !defined(CONFIG_MMU)
184 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
187 #if defined(CONFIG_X86)
188 /* MPX specific bounds table or bounds directory */
189 # define VM_MPX VM_ARCH_2
193 # define VM_GROWSUP VM_NONE
196 /* Bits set in the VMA until the stack is in its final location */
197 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
199 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
200 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
203 #ifdef CONFIG_STACK_GROWSUP
204 #define VM_STACK VM_GROWSUP
206 #define VM_STACK VM_GROWSDOWN
209 #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
212 * Special vmas that are non-mergable, non-mlock()able.
213 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
215 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
217 /* This mask defines which mm->def_flags a process can inherit its parent */
218 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
220 /* This mask is used to clear all the VMA flags used by mlock */
221 #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
224 * mapping from the currently active vm_flags protection bits (the
225 * low four bits) to a page protection mask..
227 extern pgprot_t protection_map
[16];
229 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
230 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
231 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
232 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
233 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
234 #define FAULT_FLAG_TRIED 0x20 /* Second try */
235 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
238 * vm_fault is filled by the the pagefault handler and passed to the vma's
239 * ->fault function. The vma's ->fault is responsible for returning a bitmask
240 * of VM_FAULT_xxx flags that give details about how the fault was handled.
242 * MM layer fills up gfp_mask for page allocations but fault handler might
243 * alter it if its implementation requires a different allocation context.
245 * pgoff should be used in favour of virtual_address, if possible.
248 unsigned int flags
; /* FAULT_FLAG_xxx flags */
249 gfp_t gfp_mask
; /* gfp mask to be used for allocations */
250 pgoff_t pgoff
; /* Logical page offset based on vma */
251 void __user
*virtual_address
; /* Faulting virtual address */
253 struct page
*cow_page
; /* Handler may choose to COW */
254 struct page
*page
; /* ->fault handlers should return a
255 * page here, unless VM_FAULT_NOPAGE
256 * is set (which is also implied by
259 /* for ->map_pages() only */
260 pgoff_t max_pgoff
; /* map pages for offset from pgoff till
261 * max_pgoff inclusive */
262 pte_t
*pte
; /* pte entry associated with ->pgoff */
266 * These are the virtual MM functions - opening of an area, closing and
267 * unmapping it (needed to keep files on disk up-to-date etc), pointer
268 * to the functions called when a no-page or a wp-page exception occurs.
270 struct vm_operations_struct
{
271 void (*open
)(struct vm_area_struct
* area
);
272 void (*close
)(struct vm_area_struct
* area
);
273 int (*mremap
)(struct vm_area_struct
* area
);
274 int (*fault
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
275 int (*pmd_fault
)(struct vm_area_struct
*, unsigned long address
,
276 pmd_t
*, unsigned int flags
);
277 void (*map_pages
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
279 /* notification that a previously read-only page is about to become
280 * writable, if an error is returned it will cause a SIGBUS */
281 int (*page_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
283 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
284 int (*pfn_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
286 /* called by access_process_vm when get_user_pages() fails, typically
287 * for use by special VMAs that can switch between memory and hardware
289 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
290 void *buf
, int len
, int write
);
292 /* Called by the /proc/PID/maps code to ask the vma whether it
293 * has a special name. Returning non-NULL will also cause this
294 * vma to be dumped unconditionally. */
295 const char *(*name
)(struct vm_area_struct
*vma
);
299 * set_policy() op must add a reference to any non-NULL @new mempolicy
300 * to hold the policy upon return. Caller should pass NULL @new to
301 * remove a policy and fall back to surrounding context--i.e. do not
302 * install a MPOL_DEFAULT policy, nor the task or system default
305 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
308 * get_policy() op must add reference [mpol_get()] to any policy at
309 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
310 * in mm/mempolicy.c will do this automatically.
311 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
312 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
313 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
314 * must return NULL--i.e., do not "fallback" to task or system default
317 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
321 * Called by vm_normal_page() for special PTEs to find the
322 * page for @addr. This is useful if the default behavior
323 * (using pte_page()) would not find the correct page.
325 struct page
*(*find_special_page
)(struct vm_area_struct
*vma
,
332 #define page_private(page) ((page)->private)
333 #define set_page_private(page, v) ((page)->private = (v))
335 #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
336 static inline int pmd_devmap(pmd_t pmd
)
343 * FIXME: take this include out, include page-flags.h in
344 * files which need it (119 of them)
346 #include <linux/page-flags.h>
347 #include <linux/huge_mm.h>
350 * Methods to modify the page usage count.
352 * What counts for a page usage:
353 * - cache mapping (page->mapping)
354 * - private data (page->private)
355 * - page mapped in a task's page tables, each mapping
356 * is counted separately
358 * Also, many kernel routines increase the page count before a critical
359 * routine so they can be sure the page doesn't go away from under them.
363 * Drop a ref, return true if the refcount fell to zero (the page has no users)
365 static inline int put_page_testzero(struct page
*page
)
367 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) == 0, page
);
368 return atomic_dec_and_test(&page
->_count
);
372 * Try to grab a ref unless the page has a refcount of zero, return false if
374 * This can be called when MMU is off so it must not access
375 * any of the virtual mappings.
377 static inline int get_page_unless_zero(struct page
*page
)
379 return atomic_inc_not_zero(&page
->_count
);
382 extern int page_is_ram(unsigned long pfn
);
390 int region_intersects(resource_size_t offset
, size_t size
, unsigned long flags
,
393 /* Support for virtually mapped pages */
394 struct page
*vmalloc_to_page(const void *addr
);
395 unsigned long vmalloc_to_pfn(const void *addr
);
398 * Determine if an address is within the vmalloc range
400 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
401 * is no special casing required.
403 static inline int is_vmalloc_addr(const void *x
)
406 unsigned long addr
= (unsigned long)x
;
408 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
414 extern int is_vmalloc_or_module_addr(const void *x
);
416 static inline int is_vmalloc_or_module_addr(const void *x
)
422 extern void kvfree(const void *addr
);
424 static inline atomic_t
*compound_mapcount_ptr(struct page
*page
)
426 return &page
[1].compound_mapcount
;
429 static inline int compound_mapcount(struct page
*page
)
431 if (!PageCompound(page
))
433 page
= compound_head(page
);
434 return atomic_read(compound_mapcount_ptr(page
)) + 1;
438 * The atomic page->_mapcount, starts from -1: so that transitions
439 * both from it and to it can be tracked, using atomic_inc_and_test
440 * and atomic_add_negative(-1).
442 static inline void page_mapcount_reset(struct page
*page
)
444 atomic_set(&(page
)->_mapcount
, -1);
447 int __page_mapcount(struct page
*page
);
449 static inline int page_mapcount(struct page
*page
)
451 VM_BUG_ON_PAGE(PageSlab(page
), page
);
453 if (unlikely(PageCompound(page
)))
454 return __page_mapcount(page
);
455 return atomic_read(&page
->_mapcount
) + 1;
458 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
459 int total_mapcount(struct page
*page
);
461 static inline int total_mapcount(struct page
*page
)
463 return page_mapcount(page
);
467 static inline int page_count(struct page
*page
)
469 return atomic_read(&compound_head(page
)->_count
);
472 static inline struct page
*virt_to_head_page(const void *x
)
474 struct page
*page
= virt_to_page(x
);
476 return compound_head(page
);
480 * Setup the page count before being freed into the page allocator for
481 * the first time (boot or memory hotplug)
483 static inline void init_page_count(struct page
*page
)
485 atomic_set(&page
->_count
, 1);
488 void __put_page(struct page
*page
);
490 void put_pages_list(struct list_head
*pages
);
492 void split_page(struct page
*page
, unsigned int order
);
493 int split_free_page(struct page
*page
);
496 * Compound pages have a destructor function. Provide a
497 * prototype for that function and accessor functions.
498 * These are _only_ valid on the head of a compound page.
500 typedef void compound_page_dtor(struct page
*);
502 /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
503 enum compound_dtor_id
{
506 #ifdef CONFIG_HUGETLB_PAGE
509 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
514 extern compound_page_dtor
* const compound_page_dtors
[];
516 static inline void set_compound_page_dtor(struct page
*page
,
517 enum compound_dtor_id compound_dtor
)
519 VM_BUG_ON_PAGE(compound_dtor
>= NR_COMPOUND_DTORS
, page
);
520 page
[1].compound_dtor
= compound_dtor
;
523 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
525 VM_BUG_ON_PAGE(page
[1].compound_dtor
>= NR_COMPOUND_DTORS
, page
);
526 return compound_page_dtors
[page
[1].compound_dtor
];
529 static inline unsigned int compound_order(struct page
*page
)
533 return page
[1].compound_order
;
536 static inline void set_compound_order(struct page
*page
, unsigned int order
)
538 page
[1].compound_order
= order
;
541 void free_compound_page(struct page
*page
);
545 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
546 * servicing faults for write access. In the normal case, do always want
547 * pte_mkwrite. But get_user_pages can cause write faults for mappings
548 * that do not have writing enabled, when used by access_process_vm.
550 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
552 if (likely(vma
->vm_flags
& VM_WRITE
))
553 pte
= pte_mkwrite(pte
);
557 void do_set_pte(struct vm_area_struct
*vma
, unsigned long address
,
558 struct page
*page
, pte_t
*pte
, bool write
, bool anon
);
562 * Multiple processes may "see" the same page. E.g. for untouched
563 * mappings of /dev/null, all processes see the same page full of
564 * zeroes, and text pages of executables and shared libraries have
565 * only one copy in memory, at most, normally.
567 * For the non-reserved pages, page_count(page) denotes a reference count.
568 * page_count() == 0 means the page is free. page->lru is then used for
569 * freelist management in the buddy allocator.
570 * page_count() > 0 means the page has been allocated.
572 * Pages are allocated by the slab allocator in order to provide memory
573 * to kmalloc and kmem_cache_alloc. In this case, the management of the
574 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
575 * unless a particular usage is carefully commented. (the responsibility of
576 * freeing the kmalloc memory is the caller's, of course).
578 * A page may be used by anyone else who does a __get_free_page().
579 * In this case, page_count still tracks the references, and should only
580 * be used through the normal accessor functions. The top bits of page->flags
581 * and page->virtual store page management information, but all other fields
582 * are unused and could be used privately, carefully. The management of this
583 * page is the responsibility of the one who allocated it, and those who have
584 * subsequently been given references to it.
586 * The other pages (we may call them "pagecache pages") are completely
587 * managed by the Linux memory manager: I/O, buffers, swapping etc.
588 * The following discussion applies only to them.
590 * A pagecache page contains an opaque `private' member, which belongs to the
591 * page's address_space. Usually, this is the address of a circular list of
592 * the page's disk buffers. PG_private must be set to tell the VM to call
593 * into the filesystem to release these pages.
595 * A page may belong to an inode's memory mapping. In this case, page->mapping
596 * is the pointer to the inode, and page->index is the file offset of the page,
597 * in units of PAGE_CACHE_SIZE.
599 * If pagecache pages are not associated with an inode, they are said to be
600 * anonymous pages. These may become associated with the swapcache, and in that
601 * case PG_swapcache is set, and page->private is an offset into the swapcache.
603 * In either case (swapcache or inode backed), the pagecache itself holds one
604 * reference to the page. Setting PG_private should also increment the
605 * refcount. The each user mapping also has a reference to the page.
607 * The pagecache pages are stored in a per-mapping radix tree, which is
608 * rooted at mapping->page_tree, and indexed by offset.
609 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
610 * lists, we instead now tag pages as dirty/writeback in the radix tree.
612 * All pagecache pages may be subject to I/O:
613 * - inode pages may need to be read from disk,
614 * - inode pages which have been modified and are MAP_SHARED may need
615 * to be written back to the inode on disk,
616 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
617 * modified may need to be swapped out to swap space and (later) to be read
622 * The zone field is never updated after free_area_init_core()
623 * sets it, so none of the operations on it need to be atomic.
626 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
627 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
628 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
629 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
630 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
633 * Define the bit shifts to access each section. For non-existent
634 * sections we define the shift as 0; that plus a 0 mask ensures
635 * the compiler will optimise away reference to them.
637 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
638 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
639 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
640 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
642 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
643 #ifdef NODE_NOT_IN_PAGE_FLAGS
644 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
645 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
646 SECTIONS_PGOFF : ZONES_PGOFF)
648 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
649 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
650 NODES_PGOFF : ZONES_PGOFF)
653 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
655 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
656 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
659 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
660 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
661 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
662 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
663 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
665 static inline enum zone_type
page_zonenum(const struct page
*page
)
667 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
670 #ifdef CONFIG_ZONE_DEVICE
671 void get_zone_device_page(struct page
*page
);
672 void put_zone_device_page(struct page
*page
);
673 static inline bool is_zone_device_page(const struct page
*page
)
675 return page_zonenum(page
) == ZONE_DEVICE
;
678 static inline void get_zone_device_page(struct page
*page
)
681 static inline void put_zone_device_page(struct page
*page
)
684 static inline bool is_zone_device_page(const struct page
*page
)
690 static inline void get_page(struct page
*page
)
692 page
= compound_head(page
);
694 * Getting a normal page or the head of a compound page
695 * requires to already have an elevated page->_count.
697 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) <= 0, page
);
698 atomic_inc(&page
->_count
);
700 if (unlikely(is_zone_device_page(page
)))
701 get_zone_device_page(page
);
704 static inline void put_page(struct page
*page
)
706 page
= compound_head(page
);
708 if (put_page_testzero(page
))
711 if (unlikely(is_zone_device_page(page
)))
712 put_zone_device_page(page
);
715 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
716 #define SECTION_IN_PAGE_FLAGS
720 * The identification function is mainly used by the buddy allocator for
721 * determining if two pages could be buddies. We are not really identifying
722 * the zone since we could be using the section number id if we do not have
723 * node id available in page flags.
724 * We only guarantee that it will return the same value for two combinable
727 static inline int page_zone_id(struct page
*page
)
729 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
732 static inline int zone_to_nid(struct zone
*zone
)
741 #ifdef NODE_NOT_IN_PAGE_FLAGS
742 extern int page_to_nid(const struct page
*page
);
744 static inline int page_to_nid(const struct page
*page
)
746 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
750 #ifdef CONFIG_NUMA_BALANCING
751 static inline int cpu_pid_to_cpupid(int cpu
, int pid
)
753 return ((cpu
& LAST__CPU_MASK
) << LAST__PID_SHIFT
) | (pid
& LAST__PID_MASK
);
756 static inline int cpupid_to_pid(int cpupid
)
758 return cpupid
& LAST__PID_MASK
;
761 static inline int cpupid_to_cpu(int cpupid
)
763 return (cpupid
>> LAST__PID_SHIFT
) & LAST__CPU_MASK
;
766 static inline int cpupid_to_nid(int cpupid
)
768 return cpu_to_node(cpupid_to_cpu(cpupid
));
771 static inline bool cpupid_pid_unset(int cpupid
)
773 return cpupid_to_pid(cpupid
) == (-1 & LAST__PID_MASK
);
776 static inline bool cpupid_cpu_unset(int cpupid
)
778 return cpupid_to_cpu(cpupid
) == (-1 & LAST__CPU_MASK
);
781 static inline bool __cpupid_match_pid(pid_t task_pid
, int cpupid
)
783 return (task_pid
& LAST__PID_MASK
) == cpupid_to_pid(cpupid
);
786 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
787 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
788 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
790 return xchg(&page
->_last_cpupid
, cpupid
& LAST_CPUPID_MASK
);
793 static inline int page_cpupid_last(struct page
*page
)
795 return page
->_last_cpupid
;
797 static inline void page_cpupid_reset_last(struct page
*page
)
799 page
->_last_cpupid
= -1 & LAST_CPUPID_MASK
;
802 static inline int page_cpupid_last(struct page
*page
)
804 return (page
->flags
>> LAST_CPUPID_PGSHIFT
) & LAST_CPUPID_MASK
;
807 extern int page_cpupid_xchg_last(struct page
*page
, int cpupid
);
809 static inline void page_cpupid_reset_last(struct page
*page
)
811 int cpupid
= (1 << LAST_CPUPID_SHIFT
) - 1;
813 page
->flags
&= ~(LAST_CPUPID_MASK
<< LAST_CPUPID_PGSHIFT
);
814 page
->flags
|= (cpupid
& LAST_CPUPID_MASK
) << LAST_CPUPID_PGSHIFT
;
816 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
817 #else /* !CONFIG_NUMA_BALANCING */
818 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
820 return page_to_nid(page
); /* XXX */
823 static inline int page_cpupid_last(struct page
*page
)
825 return page_to_nid(page
); /* XXX */
828 static inline int cpupid_to_nid(int cpupid
)
833 static inline int cpupid_to_pid(int cpupid
)
838 static inline int cpupid_to_cpu(int cpupid
)
843 static inline int cpu_pid_to_cpupid(int nid
, int pid
)
848 static inline bool cpupid_pid_unset(int cpupid
)
853 static inline void page_cpupid_reset_last(struct page
*page
)
857 static inline bool cpupid_match_pid(struct task_struct
*task
, int cpupid
)
861 #endif /* CONFIG_NUMA_BALANCING */
863 static inline struct zone
*page_zone(const struct page
*page
)
865 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
868 #ifdef SECTION_IN_PAGE_FLAGS
869 static inline void set_page_section(struct page
*page
, unsigned long section
)
871 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
872 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
875 static inline unsigned long page_to_section(const struct page
*page
)
877 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
881 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
883 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
884 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
887 static inline void set_page_node(struct page
*page
, unsigned long node
)
889 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
890 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
893 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
894 unsigned long node
, unsigned long pfn
)
896 set_page_zone(page
, zone
);
897 set_page_node(page
, node
);
898 #ifdef SECTION_IN_PAGE_FLAGS
899 set_page_section(page
, pfn_to_section_nr(pfn
));
904 static inline struct mem_cgroup
*page_memcg(struct page
*page
)
906 return page
->mem_cgroup
;
909 static inline struct mem_cgroup
*page_memcg(struct page
*page
)
916 * Some inline functions in vmstat.h depend on page_zone()
918 #include <linux/vmstat.h>
920 static __always_inline
void *lowmem_page_address(const struct page
*page
)
922 return __va(PFN_PHYS(page_to_pfn(page
)));
925 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
926 #define HASHED_PAGE_VIRTUAL
929 #if defined(WANT_PAGE_VIRTUAL)
930 static inline void *page_address(const struct page
*page
)
932 return page
->virtual;
934 static inline void set_page_address(struct page
*page
, void *address
)
936 page
->virtual = address
;
938 #define page_address_init() do { } while(0)
941 #if defined(HASHED_PAGE_VIRTUAL)
942 void *page_address(const struct page
*page
);
943 void set_page_address(struct page
*page
, void *virtual);
944 void page_address_init(void);
947 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
948 #define page_address(page) lowmem_page_address(page)
949 #define set_page_address(page, address) do { } while(0)
950 #define page_address_init() do { } while(0)
953 extern void *page_rmapping(struct page
*page
);
954 extern struct anon_vma
*page_anon_vma(struct page
*page
);
955 extern struct address_space
*page_mapping(struct page
*page
);
957 extern struct address_space
*__page_file_mapping(struct page
*);
960 struct address_space
*page_file_mapping(struct page
*page
)
962 if (unlikely(PageSwapCache(page
)))
963 return __page_file_mapping(page
);
965 return page
->mapping
;
969 * Return the pagecache index of the passed page. Regular pagecache pages
970 * use ->index whereas swapcache pages use ->private
972 static inline pgoff_t
page_index(struct page
*page
)
974 if (unlikely(PageSwapCache(page
)))
975 return page_private(page
);
979 extern pgoff_t
__page_file_index(struct page
*page
);
982 * Return the file index of the page. Regular pagecache pages use ->index
983 * whereas swapcache pages use swp_offset(->private)
985 static inline pgoff_t
page_file_index(struct page
*page
)
987 if (unlikely(PageSwapCache(page
)))
988 return __page_file_index(page
);
994 * Return true if this page is mapped into pagetables.
995 * For compound page it returns true if any subpage of compound page is mapped.
997 static inline bool page_mapped(struct page
*page
)
1000 if (likely(!PageCompound(page
)))
1001 return atomic_read(&page
->_mapcount
) >= 0;
1002 page
= compound_head(page
);
1003 if (atomic_read(compound_mapcount_ptr(page
)) >= 0)
1005 for (i
= 0; i
< hpage_nr_pages(page
); i
++) {
1006 if (atomic_read(&page
[i
]._mapcount
) >= 0)
1013 * Return true only if the page has been allocated with
1014 * ALLOC_NO_WATERMARKS and the low watermark was not
1015 * met implying that the system is under some pressure.
1017 static inline bool page_is_pfmemalloc(struct page
*page
)
1020 * Page index cannot be this large so this must be
1021 * a pfmemalloc page.
1023 return page
->index
== -1UL;
1027 * Only to be called by the page allocator on a freshly allocated
1030 static inline void set_page_pfmemalloc(struct page
*page
)
1035 static inline void clear_page_pfmemalloc(struct page
*page
)
1041 * Different kinds of faults, as returned by handle_mm_fault().
1042 * Used to decide whether a process gets delivered SIGBUS or
1043 * just gets major/minor fault counters bumped up.
1046 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1048 #define VM_FAULT_OOM 0x0001
1049 #define VM_FAULT_SIGBUS 0x0002
1050 #define VM_FAULT_MAJOR 0x0004
1051 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1052 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1053 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1054 #define VM_FAULT_SIGSEGV 0x0040
1056 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1057 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1058 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1059 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1061 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1063 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1064 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1067 /* Encode hstate index for a hwpoisoned large page */
1068 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1069 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1072 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1074 extern void pagefault_out_of_memory(void);
1076 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1079 * Flags passed to show_mem() and show_free_areas() to suppress output in
1082 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1084 extern void show_free_areas(unsigned int flags
);
1085 extern bool skip_free_areas_node(unsigned int flags
, int nid
);
1087 int shmem_zero_setup(struct vm_area_struct
*);
1089 bool shmem_mapping(struct address_space
*mapping
);
1091 static inline bool shmem_mapping(struct address_space
*mapping
)
1097 extern bool can_do_mlock(void);
1098 extern int user_shm_lock(size_t, struct user_struct
*);
1099 extern void user_shm_unlock(size_t, struct user_struct
*);
1102 * Parameter block passed down to zap_pte_range in exceptional cases.
1104 struct zap_details
{
1105 struct address_space
*check_mapping
; /* Check page->mapping if set */
1106 pgoff_t first_index
; /* Lowest page->index to unmap */
1107 pgoff_t last_index
; /* Highest page->index to unmap */
1110 struct page
*vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
1113 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
1114 unsigned long size
);
1115 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
1116 unsigned long size
, struct zap_details
*);
1117 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
1118 unsigned long start
, unsigned long end
);
1121 * mm_walk - callbacks for walk_page_range
1122 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1123 * this handler is required to be able to handle
1124 * pmd_trans_huge() pmds. They may simply choose to
1125 * split_huge_page() instead of handling it explicitly.
1126 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1127 * @pte_hole: if set, called for each hole at all levels
1128 * @hugetlb_entry: if set, called for each hugetlb entry
1129 * @test_walk: caller specific callback function to determine whether
1130 * we walk over the current vma or not. A positive returned
1131 * value means "do page table walk over the current vma,"
1132 * and a negative one means "abort current page table walk
1133 * right now." 0 means "skip the current vma."
1134 * @mm: mm_struct representing the target process of page table walk
1135 * @vma: vma currently walked (NULL if walking outside vmas)
1136 * @private: private data for callbacks' usage
1138 * (see the comment on walk_page_range() for more details)
1141 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
1142 unsigned long next
, struct mm_walk
*walk
);
1143 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
1144 unsigned long next
, struct mm_walk
*walk
);
1145 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
1146 struct mm_walk
*walk
);
1147 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
1148 unsigned long addr
, unsigned long next
,
1149 struct mm_walk
*walk
);
1150 int (*test_walk
)(unsigned long addr
, unsigned long next
,
1151 struct mm_walk
*walk
);
1152 struct mm_struct
*mm
;
1153 struct vm_area_struct
*vma
;
1157 int walk_page_range(unsigned long addr
, unsigned long end
,
1158 struct mm_walk
*walk
);
1159 int walk_page_vma(struct vm_area_struct
*vma
, struct mm_walk
*walk
);
1160 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1161 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1162 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1163 struct vm_area_struct
*vma
);
1164 void unmap_mapping_range(struct address_space
*mapping
,
1165 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1166 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1167 unsigned long *pfn
);
1168 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1169 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1170 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1171 void *buf
, int len
, int write
);
1173 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1174 loff_t
const holebegin
, loff_t
const holelen
)
1176 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1179 extern void truncate_pagecache(struct inode
*inode
, loff_t
new);
1180 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1181 void pagecache_isize_extended(struct inode
*inode
, loff_t from
, loff_t to
);
1182 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1183 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1184 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1185 int invalidate_inode_page(struct page
*page
);
1188 extern int handle_mm_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1189 unsigned long address
, unsigned int flags
);
1190 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1191 unsigned long address
, unsigned int fault_flags
,
1194 static inline int handle_mm_fault(struct mm_struct
*mm
,
1195 struct vm_area_struct
*vma
, unsigned long address
,
1198 /* should never happen if there's no MMU */
1200 return VM_FAULT_SIGBUS
;
1202 static inline int fixup_user_fault(struct task_struct
*tsk
,
1203 struct mm_struct
*mm
, unsigned long address
,
1204 unsigned int fault_flags
, bool *unlocked
)
1206 /* should never happen if there's no MMU */
1212 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
1213 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1214 void *buf
, int len
, int write
);
1216 long __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1217 unsigned long start
, unsigned long nr_pages
,
1218 unsigned int foll_flags
, struct page
**pages
,
1219 struct vm_area_struct
**vmas
, int *nonblocking
);
1220 long get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1221 unsigned long start
, unsigned long nr_pages
,
1222 int write
, int force
, struct page
**pages
,
1223 struct vm_area_struct
**vmas
);
1224 long get_user_pages_locked(struct task_struct
*tsk
, struct mm_struct
*mm
,
1225 unsigned long start
, unsigned long nr_pages
,
1226 int write
, int force
, struct page
**pages
,
1228 long __get_user_pages_unlocked(struct task_struct
*tsk
, struct mm_struct
*mm
,
1229 unsigned long start
, unsigned long nr_pages
,
1230 int write
, int force
, struct page
**pages
,
1231 unsigned int gup_flags
);
1232 long get_user_pages_unlocked(struct task_struct
*tsk
, struct mm_struct
*mm
,
1233 unsigned long start
, unsigned long nr_pages
,
1234 int write
, int force
, struct page
**pages
);
1235 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1236 struct page
**pages
);
1238 /* Container for pinned pfns / pages */
1239 struct frame_vector
{
1240 unsigned int nr_allocated
; /* Number of frames we have space for */
1241 unsigned int nr_frames
; /* Number of frames stored in ptrs array */
1242 bool got_ref
; /* Did we pin pages by getting page ref? */
1243 bool is_pfns
; /* Does array contain pages or pfns? */
1244 void *ptrs
[0]; /* Array of pinned pfns / pages. Use
1245 * pfns_vector_pages() or pfns_vector_pfns()
1249 struct frame_vector
*frame_vector_create(unsigned int nr_frames
);
1250 void frame_vector_destroy(struct frame_vector
*vec
);
1251 int get_vaddr_frames(unsigned long start
, unsigned int nr_pfns
,
1252 bool write
, bool force
, struct frame_vector
*vec
);
1253 void put_vaddr_frames(struct frame_vector
*vec
);
1254 int frame_vector_to_pages(struct frame_vector
*vec
);
1255 void frame_vector_to_pfns(struct frame_vector
*vec
);
1257 static inline unsigned int frame_vector_count(struct frame_vector
*vec
)
1259 return vec
->nr_frames
;
1262 static inline struct page
**frame_vector_pages(struct frame_vector
*vec
)
1265 int err
= frame_vector_to_pages(vec
);
1268 return ERR_PTR(err
);
1270 return (struct page
**)(vec
->ptrs
);
1273 static inline unsigned long *frame_vector_pfns(struct frame_vector
*vec
)
1276 frame_vector_to_pfns(vec
);
1277 return (unsigned long *)(vec
->ptrs
);
1281 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1282 struct page
**pages
);
1283 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1284 struct page
*get_dump_page(unsigned long addr
);
1286 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1287 extern void do_invalidatepage(struct page
*page
, unsigned int offset
,
1288 unsigned int length
);
1290 int __set_page_dirty_nobuffers(struct page
*page
);
1291 int __set_page_dirty_no_writeback(struct page
*page
);
1292 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1294 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
,
1295 struct mem_cgroup
*memcg
);
1296 void account_page_cleaned(struct page
*page
, struct address_space
*mapping
,
1297 struct mem_cgroup
*memcg
, struct bdi_writeback
*wb
);
1298 int set_page_dirty(struct page
*page
);
1299 int set_page_dirty_lock(struct page
*page
);
1300 void cancel_dirty_page(struct page
*page
);
1301 int clear_page_dirty_for_io(struct page
*page
);
1303 int get_cmdline(struct task_struct
*task
, char *buffer
, int buflen
);
1305 /* Is the vma a continuation of the stack vma above it? */
1306 static inline int vma_growsdown(struct vm_area_struct
*vma
, unsigned long addr
)
1308 return vma
&& (vma
->vm_end
== addr
) && (vma
->vm_flags
& VM_GROWSDOWN
);
1311 static inline bool vma_is_anonymous(struct vm_area_struct
*vma
)
1313 return !vma
->vm_ops
;
1316 static inline int stack_guard_page_start(struct vm_area_struct
*vma
,
1319 return (vma
->vm_flags
& VM_GROWSDOWN
) &&
1320 (vma
->vm_start
== addr
) &&
1321 !vma_growsdown(vma
->vm_prev
, addr
);
1324 /* Is the vma a continuation of the stack vma below it? */
1325 static inline int vma_growsup(struct vm_area_struct
*vma
, unsigned long addr
)
1327 return vma
&& (vma
->vm_start
== addr
) && (vma
->vm_flags
& VM_GROWSUP
);
1330 static inline int stack_guard_page_end(struct vm_area_struct
*vma
,
1333 return (vma
->vm_flags
& VM_GROWSUP
) &&
1334 (vma
->vm_end
== addr
) &&
1335 !vma_growsup(vma
->vm_next
, addr
);
1338 int vma_is_stack_for_task(struct vm_area_struct
*vma
, struct task_struct
*t
);
1340 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1341 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1342 unsigned long new_addr
, unsigned long len
,
1343 bool need_rmap_locks
);
1344 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1345 unsigned long end
, pgprot_t newprot
,
1346 int dirty_accountable
, int prot_numa
);
1347 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1348 struct vm_area_struct
**pprev
, unsigned long start
,
1349 unsigned long end
, unsigned long newflags
);
1352 * doesn't attempt to fault and will return short.
1354 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1355 struct page
**pages
);
1357 * per-process(per-mm_struct) statistics.
1359 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1361 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1363 #ifdef SPLIT_RSS_COUNTING
1365 * counter is updated in asynchronous manner and may go to minus.
1366 * But it's never be expected number for users.
1371 return (unsigned long)val
;
1374 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1376 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1379 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1381 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1384 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1386 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1389 /* Optimized variant when page is already known not to be PageAnon */
1390 static inline int mm_counter_file(struct page
*page
)
1392 if (PageSwapBacked(page
))
1393 return MM_SHMEMPAGES
;
1394 return MM_FILEPAGES
;
1397 static inline int mm_counter(struct page
*page
)
1400 return MM_ANONPAGES
;
1401 return mm_counter_file(page
);
1404 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1406 return get_mm_counter(mm
, MM_FILEPAGES
) +
1407 get_mm_counter(mm
, MM_ANONPAGES
) +
1408 get_mm_counter(mm
, MM_SHMEMPAGES
);
1411 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1413 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1416 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1418 return max(mm
->hiwater_vm
, mm
->total_vm
);
1421 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1423 unsigned long _rss
= get_mm_rss(mm
);
1425 if ((mm
)->hiwater_rss
< _rss
)
1426 (mm
)->hiwater_rss
= _rss
;
1429 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1431 if (mm
->hiwater_vm
< mm
->total_vm
)
1432 mm
->hiwater_vm
= mm
->total_vm
;
1435 static inline void reset_mm_hiwater_rss(struct mm_struct
*mm
)
1437 mm
->hiwater_rss
= get_mm_rss(mm
);
1440 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1441 struct mm_struct
*mm
)
1443 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1445 if (*maxrss
< hiwater_rss
)
1446 *maxrss
= hiwater_rss
;
1449 #if defined(SPLIT_RSS_COUNTING)
1450 void sync_mm_rss(struct mm_struct
*mm
);
1452 static inline void sync_mm_rss(struct mm_struct
*mm
)
1457 #ifndef __HAVE_ARCH_PTE_DEVMAP
1458 static inline int pte_devmap(pte_t pte
)
1464 int vma_wants_writenotify(struct vm_area_struct
*vma
);
1466 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1468 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1472 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1476 #ifdef __PAGETABLE_PUD_FOLDED
1477 static inline int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1478 unsigned long address
)
1483 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1486 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1487 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1488 unsigned long address
)
1493 static inline void mm_nr_pmds_init(struct mm_struct
*mm
) {}
1495 static inline unsigned long mm_nr_pmds(struct mm_struct
*mm
)
1500 static inline void mm_inc_nr_pmds(struct mm_struct
*mm
) {}
1501 static inline void mm_dec_nr_pmds(struct mm_struct
*mm
) {}
1504 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1506 static inline void mm_nr_pmds_init(struct mm_struct
*mm
)
1508 atomic_long_set(&mm
->nr_pmds
, 0);
1511 static inline unsigned long mm_nr_pmds(struct mm_struct
*mm
)
1513 return atomic_long_read(&mm
->nr_pmds
);
1516 static inline void mm_inc_nr_pmds(struct mm_struct
*mm
)
1518 atomic_long_inc(&mm
->nr_pmds
);
1521 static inline void mm_dec_nr_pmds(struct mm_struct
*mm
)
1523 atomic_long_dec(&mm
->nr_pmds
);
1527 int __pte_alloc(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1528 pmd_t
*pmd
, unsigned long address
);
1529 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1532 * The following ifdef needed to get the 4level-fixup.h header to work.
1533 * Remove it when 4level-fixup.h has been removed.
1535 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1536 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
1538 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
1539 NULL
: pud_offset(pgd
, address
);
1542 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1544 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1545 NULL
: pmd_offset(pud
, address
);
1547 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1549 #if USE_SPLIT_PTE_PTLOCKS
1550 #if ALLOC_SPLIT_PTLOCKS
1551 void __init
ptlock_cache_init(void);
1552 extern bool ptlock_alloc(struct page
*page
);
1553 extern void ptlock_free(struct page
*page
);
1555 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1559 #else /* ALLOC_SPLIT_PTLOCKS */
1560 static inline void ptlock_cache_init(void)
1564 static inline bool ptlock_alloc(struct page
*page
)
1569 static inline void ptlock_free(struct page
*page
)
1573 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1577 #endif /* ALLOC_SPLIT_PTLOCKS */
1579 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1581 return ptlock_ptr(pmd_page(*pmd
));
1584 static inline bool ptlock_init(struct page
*page
)
1587 * prep_new_page() initialize page->private (and therefore page->ptl)
1588 * with 0. Make sure nobody took it in use in between.
1590 * It can happen if arch try to use slab for page table allocation:
1591 * slab code uses page->slab_cache, which share storage with page->ptl.
1593 VM_BUG_ON_PAGE(*(unsigned long *)&page
->ptl
, page
);
1594 if (!ptlock_alloc(page
))
1596 spin_lock_init(ptlock_ptr(page
));
1600 /* Reset page->mapping so free_pages_check won't complain. */
1601 static inline void pte_lock_deinit(struct page
*page
)
1603 page
->mapping
= NULL
;
1607 #else /* !USE_SPLIT_PTE_PTLOCKS */
1609 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1611 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1613 return &mm
->page_table_lock
;
1615 static inline void ptlock_cache_init(void) {}
1616 static inline bool ptlock_init(struct page
*page
) { return true; }
1617 static inline void pte_lock_deinit(struct page
*page
) {}
1618 #endif /* USE_SPLIT_PTE_PTLOCKS */
1620 static inline void pgtable_init(void)
1622 ptlock_cache_init();
1623 pgtable_cache_init();
1626 static inline bool pgtable_page_ctor(struct page
*page
)
1628 if (!ptlock_init(page
))
1630 inc_zone_page_state(page
, NR_PAGETABLE
);
1634 static inline void pgtable_page_dtor(struct page
*page
)
1636 pte_lock_deinit(page
);
1637 dec_zone_page_state(page
, NR_PAGETABLE
);
1640 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1642 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1643 pte_t *__pte = pte_offset_map(pmd, address); \
1649 #define pte_unmap_unlock(pte, ptl) do { \
1654 #define pte_alloc_map(mm, vma, pmd, address) \
1655 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1657 NULL: pte_offset_map(pmd, address))
1659 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1660 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1662 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1664 #define pte_alloc_kernel(pmd, address) \
1665 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1666 NULL: pte_offset_kernel(pmd, address))
1668 #if USE_SPLIT_PMD_PTLOCKS
1670 static struct page
*pmd_to_page(pmd_t
*pmd
)
1672 unsigned long mask
= ~(PTRS_PER_PMD
* sizeof(pmd_t
) - 1);
1673 return virt_to_page((void *)((unsigned long) pmd
& mask
));
1676 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1678 return ptlock_ptr(pmd_to_page(pmd
));
1681 static inline bool pgtable_pmd_page_ctor(struct page
*page
)
1683 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1684 page
->pmd_huge_pte
= NULL
;
1686 return ptlock_init(page
);
1689 static inline void pgtable_pmd_page_dtor(struct page
*page
)
1691 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1692 VM_BUG_ON_PAGE(page
->pmd_huge_pte
, page
);
1697 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1701 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1703 return &mm
->page_table_lock
;
1706 static inline bool pgtable_pmd_page_ctor(struct page
*page
) { return true; }
1707 static inline void pgtable_pmd_page_dtor(struct page
*page
) {}
1709 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1713 static inline spinlock_t
*pmd_lock(struct mm_struct
*mm
, pmd_t
*pmd
)
1715 spinlock_t
*ptl
= pmd_lockptr(mm
, pmd
);
1720 extern void free_area_init(unsigned long * zones_size
);
1721 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1722 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1723 extern void free_initmem(void);
1726 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1727 * into the buddy system. The freed pages will be poisoned with pattern
1728 * "poison" if it's within range [0, UCHAR_MAX].
1729 * Return pages freed into the buddy system.
1731 extern unsigned long free_reserved_area(void *start
, void *end
,
1732 int poison
, char *s
);
1734 #ifdef CONFIG_HIGHMEM
1736 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1737 * and totalram_pages.
1739 extern void free_highmem_page(struct page
*page
);
1742 extern void adjust_managed_page_count(struct page
*page
, long count
);
1743 extern void mem_init_print_info(const char *str
);
1745 extern void reserve_bootmem_region(unsigned long start
, unsigned long end
);
1747 /* Free the reserved page into the buddy system, so it gets managed. */
1748 static inline void __free_reserved_page(struct page
*page
)
1750 ClearPageReserved(page
);
1751 init_page_count(page
);
1755 static inline void free_reserved_page(struct page
*page
)
1757 __free_reserved_page(page
);
1758 adjust_managed_page_count(page
, 1);
1761 static inline void mark_page_reserved(struct page
*page
)
1763 SetPageReserved(page
);
1764 adjust_managed_page_count(page
, -1);
1768 * Default method to free all the __init memory into the buddy system.
1769 * The freed pages will be poisoned with pattern "poison" if it's within
1770 * range [0, UCHAR_MAX].
1771 * Return pages freed into the buddy system.
1773 static inline unsigned long free_initmem_default(int poison
)
1775 extern char __init_begin
[], __init_end
[];
1777 return free_reserved_area(&__init_begin
, &__init_end
,
1778 poison
, "unused kernel");
1781 static inline unsigned long get_num_physpages(void)
1784 unsigned long phys_pages
= 0;
1786 for_each_online_node(nid
)
1787 phys_pages
+= node_present_pages(nid
);
1792 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1794 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1795 * zones, allocate the backing mem_map and account for memory holes in a more
1796 * architecture independent manner. This is a substitute for creating the
1797 * zone_sizes[] and zholes_size[] arrays and passing them to
1798 * free_area_init_node()
1800 * An architecture is expected to register range of page frames backed by
1801 * physical memory with memblock_add[_node]() before calling
1802 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1803 * usage, an architecture is expected to do something like
1805 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1807 * for_each_valid_physical_page_range()
1808 * memblock_add_node(base, size, nid)
1809 * free_area_init_nodes(max_zone_pfns);
1811 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1812 * registered physical page range. Similarly
1813 * sparse_memory_present_with_active_regions() calls memory_present() for
1814 * each range when SPARSEMEM is enabled.
1816 * See mm/page_alloc.c for more information on each function exposed by
1817 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1819 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1820 unsigned long node_map_pfn_alignment(void);
1821 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1822 unsigned long end_pfn
);
1823 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1824 unsigned long end_pfn
);
1825 extern void get_pfn_range_for_nid(unsigned int nid
,
1826 unsigned long *start_pfn
, unsigned long *end_pfn
);
1827 extern unsigned long find_min_pfn_with_active_regions(void);
1828 extern void free_bootmem_with_active_regions(int nid
,
1829 unsigned long max_low_pfn
);
1830 extern void sparse_memory_present_with_active_regions(int nid
);
1832 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1834 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1835 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1836 static inline int __early_pfn_to_nid(unsigned long pfn
,
1837 struct mminit_pfnnid_cache
*state
)
1842 /* please see mm/page_alloc.c */
1843 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1844 /* there is a per-arch backend function. */
1845 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
,
1846 struct mminit_pfnnid_cache
*state
);
1849 extern void set_dma_reserve(unsigned long new_dma_reserve
);
1850 extern void memmap_init_zone(unsigned long, int, unsigned long,
1851 unsigned long, enum memmap_context
);
1852 extern void setup_per_zone_wmarks(void);
1853 extern int __meminit
init_per_zone_wmark_min(void);
1854 extern void mem_init(void);
1855 extern void __init
mmap_init(void);
1856 extern void show_mem(unsigned int flags
);
1857 extern void si_meminfo(struct sysinfo
* val
);
1858 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
1860 extern __printf(3, 4)
1861 void warn_alloc_failed(gfp_t gfp_mask
, unsigned int order
,
1862 const char *fmt
, ...);
1864 extern void setup_per_cpu_pageset(void);
1866 extern void zone_pcp_update(struct zone
*zone
);
1867 extern void zone_pcp_reset(struct zone
*zone
);
1870 extern int min_free_kbytes
;
1873 extern atomic_long_t mmap_pages_allocated
;
1874 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
1876 /* interval_tree.c */
1877 void vma_interval_tree_insert(struct vm_area_struct
*node
,
1878 struct rb_root
*root
);
1879 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
1880 struct vm_area_struct
*prev
,
1881 struct rb_root
*root
);
1882 void vma_interval_tree_remove(struct vm_area_struct
*node
,
1883 struct rb_root
*root
);
1884 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root
*root
,
1885 unsigned long start
, unsigned long last
);
1886 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
1887 unsigned long start
, unsigned long last
);
1889 #define vma_interval_tree_foreach(vma, root, start, last) \
1890 for (vma = vma_interval_tree_iter_first(root, start, last); \
1891 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1893 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
1894 struct rb_root
*root
);
1895 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
1896 struct rb_root
*root
);
1897 struct anon_vma_chain
*anon_vma_interval_tree_iter_first(
1898 struct rb_root
*root
, unsigned long start
, unsigned long last
);
1899 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
1900 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
1901 #ifdef CONFIG_DEBUG_VM_RB
1902 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
1905 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1906 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1907 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1910 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
1911 extern int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
1912 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
1913 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
1914 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
1915 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
1916 struct mempolicy
*, struct vm_userfaultfd_ctx
);
1917 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
1918 extern int split_vma(struct mm_struct
*,
1919 struct vm_area_struct
*, unsigned long addr
, int new_below
);
1920 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
1921 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
1922 struct rb_node
**, struct rb_node
*);
1923 extern void unlink_file_vma(struct vm_area_struct
*);
1924 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
1925 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
1926 bool *need_rmap_locks
);
1927 extern void exit_mmap(struct mm_struct
*);
1929 static inline int check_data_rlimit(unsigned long rlim
,
1931 unsigned long start
,
1932 unsigned long end_data
,
1933 unsigned long start_data
)
1935 if (rlim
< RLIM_INFINITY
) {
1936 if (((new - start
) + (end_data
- start_data
)) > rlim
)
1943 extern int mm_take_all_locks(struct mm_struct
*mm
);
1944 extern void mm_drop_all_locks(struct mm_struct
*mm
);
1946 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
1947 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
1949 extern bool may_expand_vm(struct mm_struct
*, vm_flags_t
, unsigned long npages
);
1950 extern void vm_stat_account(struct mm_struct
*, vm_flags_t
, long npages
);
1952 extern struct vm_area_struct
*_install_special_mapping(struct mm_struct
*mm
,
1953 unsigned long addr
, unsigned long len
,
1954 unsigned long flags
,
1955 const struct vm_special_mapping
*spec
);
1956 /* This is an obsolete alternative to _install_special_mapping. */
1957 extern int install_special_mapping(struct mm_struct
*mm
,
1958 unsigned long addr
, unsigned long len
,
1959 unsigned long flags
, struct page
**pages
);
1961 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1963 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
1964 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
);
1965 extern unsigned long do_mmap(struct file
*file
, unsigned long addr
,
1966 unsigned long len
, unsigned long prot
, unsigned long flags
,
1967 vm_flags_t vm_flags
, unsigned long pgoff
, unsigned long *populate
);
1968 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
1970 static inline unsigned long
1971 do_mmap_pgoff(struct file
*file
, unsigned long addr
,
1972 unsigned long len
, unsigned long prot
, unsigned long flags
,
1973 unsigned long pgoff
, unsigned long *populate
)
1975 return do_mmap(file
, addr
, len
, prot
, flags
, 0, pgoff
, populate
);
1979 extern int __mm_populate(unsigned long addr
, unsigned long len
,
1981 static inline void mm_populate(unsigned long addr
, unsigned long len
)
1984 (void) __mm_populate(addr
, len
, 1);
1987 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
1990 /* These take the mm semaphore themselves */
1991 extern unsigned long vm_brk(unsigned long, unsigned long);
1992 extern int vm_munmap(unsigned long, size_t);
1993 extern unsigned long vm_mmap(struct file
*, unsigned long,
1994 unsigned long, unsigned long,
1995 unsigned long, unsigned long);
1997 struct vm_unmapped_area_info
{
1998 #define VM_UNMAPPED_AREA_TOPDOWN 1
1999 unsigned long flags
;
2000 unsigned long length
;
2001 unsigned long low_limit
;
2002 unsigned long high_limit
;
2003 unsigned long align_mask
;
2004 unsigned long align_offset
;
2007 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
2008 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
2011 * Search for an unmapped address range.
2013 * We are looking for a range that:
2014 * - does not intersect with any VMA;
2015 * - is contained within the [low_limit, high_limit) interval;
2016 * - is at least the desired size.
2017 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
2019 static inline unsigned long
2020 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
2022 if (info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
)
2023 return unmapped_area_topdown(info
);
2025 return unmapped_area(info
);
2029 extern void truncate_inode_pages(struct address_space
*, loff_t
);
2030 extern void truncate_inode_pages_range(struct address_space
*,
2031 loff_t lstart
, loff_t lend
);
2032 extern void truncate_inode_pages_final(struct address_space
*);
2034 /* generic vm_area_ops exported for stackable file systems */
2035 extern int filemap_fault(struct vm_area_struct
*, struct vm_fault
*);
2036 extern void filemap_map_pages(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
2037 extern int filemap_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
2039 /* mm/page-writeback.c */
2040 int write_one_page(struct page
*page
, int wait
);
2041 void task_dirty_inc(struct task_struct
*tsk
);
2044 #define VM_MAX_READAHEAD 128 /* kbytes */
2045 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
2047 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
2048 pgoff_t offset
, unsigned long nr_to_read
);
2050 void page_cache_sync_readahead(struct address_space
*mapping
,
2051 struct file_ra_state
*ra
,
2054 unsigned long size
);
2056 void page_cache_async_readahead(struct address_space
*mapping
,
2057 struct file_ra_state
*ra
,
2061 unsigned long size
);
2063 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
2064 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
2066 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
2067 extern int expand_downwards(struct vm_area_struct
*vma
,
2068 unsigned long address
);
2070 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
2072 #define expand_upwards(vma, address) (0)
2075 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
2076 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
2077 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
2078 struct vm_area_struct
**pprev
);
2080 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
2081 NULL if none. Assume start_addr < end_addr. */
2082 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
2084 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
2086 if (vma
&& end_addr
<= vma
->vm_start
)
2091 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
2093 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
2096 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2097 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
2098 unsigned long vm_start
, unsigned long vm_end
)
2100 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
2102 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
2109 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
2110 void vma_set_page_prot(struct vm_area_struct
*vma
);
2112 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
2116 static inline void vma_set_page_prot(struct vm_area_struct
*vma
)
2118 vma
->vm_page_prot
= vm_get_page_prot(vma
->vm_flags
);
2122 #ifdef CONFIG_NUMA_BALANCING
2123 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
2124 unsigned long start
, unsigned long end
);
2127 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
2128 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
2129 unsigned long pfn
, unsigned long size
, pgprot_t
);
2130 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
2131 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
2133 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
2135 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
2138 struct page
*follow_page_mask(struct vm_area_struct
*vma
,
2139 unsigned long address
, unsigned int foll_flags
,
2140 unsigned int *page_mask
);
2142 static inline struct page
*follow_page(struct vm_area_struct
*vma
,
2143 unsigned long address
, unsigned int foll_flags
)
2145 unsigned int unused_page_mask
;
2146 return follow_page_mask(vma
, address
, foll_flags
, &unused_page_mask
);
2149 #define FOLL_WRITE 0x01 /* check pte is writable */
2150 #define FOLL_TOUCH 0x02 /* mark page accessed */
2151 #define FOLL_GET 0x04 /* do get_page on page */
2152 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2153 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2154 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2155 * and return without waiting upon it */
2156 #define FOLL_POPULATE 0x40 /* fault in page */
2157 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2158 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2159 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2160 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2161 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2162 #define FOLL_MLOCK 0x1000 /* lock present pages */
2164 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
2166 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
2167 unsigned long size
, pte_fn_t fn
, void *data
);
2170 #ifdef CONFIG_PAGE_POISONING
2171 extern bool page_poisoning_enabled(void);
2172 extern void kernel_poison_pages(struct page
*page
, int numpages
, int enable
);
2173 extern bool page_is_poisoned(struct page
*page
);
2175 static inline bool page_poisoning_enabled(void) { return false; }
2176 static inline void kernel_poison_pages(struct page
*page
, int numpages
,
2178 static inline bool page_is_poisoned(struct page
*page
) { return false; }
2181 #ifdef CONFIG_DEBUG_PAGEALLOC
2182 extern bool _debug_pagealloc_enabled
;
2183 extern void __kernel_map_pages(struct page
*page
, int numpages
, int enable
);
2185 static inline bool debug_pagealloc_enabled(void)
2187 return _debug_pagealloc_enabled
;
2191 kernel_map_pages(struct page
*page
, int numpages
, int enable
)
2193 if (!debug_pagealloc_enabled())
2196 __kernel_map_pages(page
, numpages
, enable
);
2198 #ifdef CONFIG_HIBERNATION
2199 extern bool kernel_page_present(struct page
*page
);
2200 #endif /* CONFIG_HIBERNATION */
2201 #else /* CONFIG_DEBUG_PAGEALLOC */
2203 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
2204 #ifdef CONFIG_HIBERNATION
2205 static inline bool kernel_page_present(struct page
*page
) { return true; }
2206 #endif /* CONFIG_HIBERNATION */
2207 static inline bool debug_pagealloc_enabled(void)
2211 #endif /* CONFIG_DEBUG_PAGEALLOC */
2213 #ifdef __HAVE_ARCH_GATE_AREA
2214 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
2215 extern int in_gate_area_no_mm(unsigned long addr
);
2216 extern int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
2218 static inline struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
)
2222 static inline int in_gate_area_no_mm(unsigned long addr
) { return 0; }
2223 static inline int in_gate_area(struct mm_struct
*mm
, unsigned long addr
)
2227 #endif /* __HAVE_ARCH_GATE_AREA */
2229 #ifdef CONFIG_SYSCTL
2230 extern int sysctl_drop_caches
;
2231 int drop_caches_sysctl_handler(struct ctl_table
*, int,
2232 void __user
*, size_t *, loff_t
*);
2235 void drop_slab(void);
2236 void drop_slab_node(int nid
);
2239 #define randomize_va_space 0
2241 extern int randomize_va_space
;
2244 const char * arch_vma_name(struct vm_area_struct
*vma
);
2245 void print_vma_addr(char *prefix
, unsigned long rip
);
2247 void sparse_mem_maps_populate_node(struct page
**map_map
,
2248 unsigned long pnum_begin
,
2249 unsigned long pnum_end
,
2250 unsigned long map_count
,
2253 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
2254 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
2255 pud_t
*vmemmap_pud_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
2256 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
2257 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
2258 void *vmemmap_alloc_block(unsigned long size
, int node
);
2260 void *__vmemmap_alloc_block_buf(unsigned long size
, int node
,
2261 struct vmem_altmap
*altmap
);
2262 static inline void *vmemmap_alloc_block_buf(unsigned long size
, int node
)
2264 return __vmemmap_alloc_block_buf(size
, node
, NULL
);
2267 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
2268 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
2270 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
);
2271 void vmemmap_populate_print_last(void);
2272 #ifdef CONFIG_MEMORY_HOTPLUG
2273 void vmemmap_free(unsigned long start
, unsigned long end
);
2275 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
2276 unsigned long size
);
2279 MF_COUNT_INCREASED
= 1 << 0,
2280 MF_ACTION_REQUIRED
= 1 << 1,
2281 MF_MUST_KILL
= 1 << 2,
2282 MF_SOFT_OFFLINE
= 1 << 3,
2284 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
2285 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
2286 extern int unpoison_memory(unsigned long pfn
);
2287 extern int get_hwpoison_page(struct page
*page
);
2288 #define put_hwpoison_page(page) put_page(page)
2289 extern int sysctl_memory_failure_early_kill
;
2290 extern int sysctl_memory_failure_recovery
;
2291 extern void shake_page(struct page
*p
, int access
);
2292 extern atomic_long_t num_poisoned_pages
;
2293 extern int soft_offline_page(struct page
*page
, int flags
);
2297 * Error handlers for various types of pages.
2300 MF_IGNORED
, /* Error: cannot be handled */
2301 MF_FAILED
, /* Error: handling failed */
2302 MF_DELAYED
, /* Will be handled later */
2303 MF_RECOVERED
, /* Successfully recovered */
2306 enum mf_action_page_type
{
2308 MF_MSG_KERNEL_HIGH_ORDER
,
2310 MF_MSG_DIFFERENT_COMPOUND
,
2311 MF_MSG_POISONED_HUGE
,
2314 MF_MSG_UNMAP_FAILED
,
2315 MF_MSG_DIRTY_SWAPCACHE
,
2316 MF_MSG_CLEAN_SWAPCACHE
,
2317 MF_MSG_DIRTY_MLOCKED_LRU
,
2318 MF_MSG_CLEAN_MLOCKED_LRU
,
2319 MF_MSG_DIRTY_UNEVICTABLE_LRU
,
2320 MF_MSG_CLEAN_UNEVICTABLE_LRU
,
2323 MF_MSG_TRUNCATED_LRU
,
2329 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2330 extern void clear_huge_page(struct page
*page
,
2332 unsigned int pages_per_huge_page
);
2333 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
2334 unsigned long addr
, struct vm_area_struct
*vma
,
2335 unsigned int pages_per_huge_page
);
2336 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2338 extern struct page_ext_operations debug_guardpage_ops
;
2339 extern struct page_ext_operations page_poisoning_ops
;
2341 #ifdef CONFIG_DEBUG_PAGEALLOC
2342 extern unsigned int _debug_guardpage_minorder
;
2343 extern bool _debug_guardpage_enabled
;
2345 static inline unsigned int debug_guardpage_minorder(void)
2347 return _debug_guardpage_minorder
;
2350 static inline bool debug_guardpage_enabled(void)
2352 return _debug_guardpage_enabled
;
2355 static inline bool page_is_guard(struct page
*page
)
2357 struct page_ext
*page_ext
;
2359 if (!debug_guardpage_enabled())
2362 page_ext
= lookup_page_ext(page
);
2363 return test_bit(PAGE_EXT_DEBUG_GUARD
, &page_ext
->flags
);
2366 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2367 static inline bool debug_guardpage_enabled(void) { return false; }
2368 static inline bool page_is_guard(struct page
*page
) { return false; }
2369 #endif /* CONFIG_DEBUG_PAGEALLOC */
2371 #if MAX_NUMNODES > 1
2372 void __init
setup_nr_node_ids(void);
2374 static inline void setup_nr_node_ids(void) {}
2377 #endif /* __KERNEL__ */
2378 #endif /* _LINUX_MM_H */