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/bit_spinlock.h>
20 #include <linux/shrinker.h>
21 #include <linux/resource.h>
22 #include <linux/page_ext.h>
26 struct anon_vma_chain
;
29 struct writeback_control
;
31 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
32 extern unsigned long max_mapnr
;
34 static inline void set_max_mapnr(unsigned long limit
)
39 static inline void set_max_mapnr(unsigned long limit
) { }
42 extern unsigned long totalram_pages
;
43 extern void * high_memory
;
44 extern int page_cluster
;
47 extern int sysctl_legacy_va_layout
;
49 #define sysctl_legacy_va_layout 0
53 #include <asm/pgtable.h>
54 #include <asm/processor.h>
57 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
61 * To prevent common memory management code establishing
62 * a zero page mapping on a read fault.
63 * This macro should be defined within <asm/pgtable.h>.
64 * s390 does this to prevent multiplexing of hardware bits
65 * related to the physical page in case of virtualization.
67 #ifndef mm_forbids_zeropage
68 #define mm_forbids_zeropage(X) (0)
71 extern unsigned long sysctl_user_reserve_kbytes
;
72 extern unsigned long sysctl_admin_reserve_kbytes
;
74 extern int sysctl_overcommit_memory
;
75 extern int sysctl_overcommit_ratio
;
76 extern unsigned long sysctl_overcommit_kbytes
;
78 extern int overcommit_ratio_handler(struct ctl_table
*, int, void __user
*,
80 extern int overcommit_kbytes_handler(struct ctl_table
*, int, void __user
*,
83 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
85 /* to align the pointer to the (next) page boundary */
86 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
88 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
89 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
92 * Linux kernel virtual memory manager primitives.
93 * The idea being to have a "virtual" mm in the same way
94 * we have a virtual fs - giving a cleaner interface to the
95 * mm details, and allowing different kinds of memory mappings
96 * (from shared memory to executable loading to arbitrary
100 extern struct kmem_cache
*vm_area_cachep
;
103 extern struct rb_root nommu_region_tree
;
104 extern struct rw_semaphore nommu_region_sem
;
106 extern unsigned int kobjsize(const void *objp
);
110 * vm_flags in vm_area_struct, see mm_types.h.
112 #define VM_NONE 0x00000000
114 #define VM_READ 0x00000001 /* currently active flags */
115 #define VM_WRITE 0x00000002
116 #define VM_EXEC 0x00000004
117 #define VM_SHARED 0x00000008
119 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
120 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
121 #define VM_MAYWRITE 0x00000020
122 #define VM_MAYEXEC 0x00000040
123 #define VM_MAYSHARE 0x00000080
125 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
126 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
127 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
129 #define VM_LOCKED 0x00002000
130 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
132 /* Used by sys_madvise() */
133 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
134 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
136 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
137 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
138 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
139 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
140 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
141 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
142 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
143 #define VM_ARCH_2 0x02000000
144 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
146 #ifdef CONFIG_MEM_SOFT_DIRTY
147 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
149 # define VM_SOFTDIRTY 0
152 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
153 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
154 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
155 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
157 #if defined(CONFIG_X86)
158 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
159 #elif defined(CONFIG_PPC)
160 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
161 #elif defined(CONFIG_PARISC)
162 # define VM_GROWSUP VM_ARCH_1
163 #elif defined(CONFIG_METAG)
164 # define VM_GROWSUP VM_ARCH_1
165 #elif defined(CONFIG_IA64)
166 # define VM_GROWSUP VM_ARCH_1
167 #elif !defined(CONFIG_MMU)
168 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
171 #if defined(CONFIG_X86)
172 /* MPX specific bounds table or bounds directory */
173 # define VM_MPX VM_ARCH_2
177 # define VM_GROWSUP VM_NONE
180 /* Bits set in the VMA until the stack is in its final location */
181 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
183 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
184 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
187 #ifdef CONFIG_STACK_GROWSUP
188 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
190 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
194 * Special vmas that are non-mergable, non-mlock()able.
195 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
197 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
199 /* This mask defines which mm->def_flags a process can inherit its parent */
200 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
203 * mapping from the currently active vm_flags protection bits (the
204 * low four bits) to a page protection mask..
206 extern pgprot_t protection_map
[16];
208 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
209 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
210 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
211 #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */
212 #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */
213 #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */
214 #define FAULT_FLAG_TRIED 0x40 /* second try */
215 #define FAULT_FLAG_USER 0x80 /* The fault originated in userspace */
218 * vm_fault is filled by the the pagefault handler and passed to the vma's
219 * ->fault function. The vma's ->fault is responsible for returning a bitmask
220 * of VM_FAULT_xxx flags that give details about how the fault was handled.
222 * pgoff should be used in favour of virtual_address, if possible. If pgoff
223 * is used, one may implement ->remap_pages to get nonlinear mapping support.
226 unsigned int flags
; /* FAULT_FLAG_xxx flags */
227 pgoff_t pgoff
; /* Logical page offset based on vma */
228 void __user
*virtual_address
; /* Faulting virtual address */
230 struct page
*page
; /* ->fault handlers should return a
231 * page here, unless VM_FAULT_NOPAGE
232 * is set (which is also implied by
235 /* for ->map_pages() only */
236 pgoff_t max_pgoff
; /* map pages for offset from pgoff till
237 * max_pgoff inclusive */
238 pte_t
*pte
; /* pte entry associated with ->pgoff */
242 * These are the virtual MM functions - opening of an area, closing and
243 * unmapping it (needed to keep files on disk up-to-date etc), pointer
244 * to the functions called when a no-page or a wp-page exception occurs.
246 struct vm_operations_struct
{
247 void (*open
)(struct vm_area_struct
* area
);
248 void (*close
)(struct vm_area_struct
* area
);
249 int (*fault
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
250 void (*map_pages
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
252 /* notification that a previously read-only page is about to become
253 * writable, if an error is returned it will cause a SIGBUS */
254 int (*page_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
256 /* called by access_process_vm when get_user_pages() fails, typically
257 * for use by special VMAs that can switch between memory and hardware
259 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
260 void *buf
, int len
, int write
);
262 /* Called by the /proc/PID/maps code to ask the vma whether it
263 * has a special name. Returning non-NULL will also cause this
264 * vma to be dumped unconditionally. */
265 const char *(*name
)(struct vm_area_struct
*vma
);
269 * set_policy() op must add a reference to any non-NULL @new mempolicy
270 * to hold the policy upon return. Caller should pass NULL @new to
271 * remove a policy and fall back to surrounding context--i.e. do not
272 * install a MPOL_DEFAULT policy, nor the task or system default
275 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
278 * get_policy() op must add reference [mpol_get()] to any policy at
279 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
280 * in mm/mempolicy.c will do this automatically.
281 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
282 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
283 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
284 * must return NULL--i.e., do not "fallback" to task or system default
287 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
289 int (*migrate
)(struct vm_area_struct
*vma
, const nodemask_t
*from
,
290 const nodemask_t
*to
, unsigned long flags
);
292 /* called by sys_remap_file_pages() to populate non-linear mapping */
293 int (*remap_pages
)(struct vm_area_struct
*vma
, unsigned long addr
,
294 unsigned long size
, pgoff_t pgoff
);
300 #define page_private(page) ((page)->private)
301 #define set_page_private(page, v) ((page)->private = (v))
303 /* It's valid only if the page is free path or free_list */
304 static inline void set_freepage_migratetype(struct page
*page
, int migratetype
)
306 page
->index
= migratetype
;
309 /* It's valid only if the page is free path or free_list */
310 static inline int get_freepage_migratetype(struct page
*page
)
316 * FIXME: take this include out, include page-flags.h in
317 * files which need it (119 of them)
319 #include <linux/page-flags.h>
320 #include <linux/huge_mm.h>
323 * Methods to modify the page usage count.
325 * What counts for a page usage:
326 * - cache mapping (page->mapping)
327 * - private data (page->private)
328 * - page mapped in a task's page tables, each mapping
329 * is counted separately
331 * Also, many kernel routines increase the page count before a critical
332 * routine so they can be sure the page doesn't go away from under them.
336 * Drop a ref, return true if the refcount fell to zero (the page has no users)
338 static inline int put_page_testzero(struct page
*page
)
340 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) == 0, page
);
341 return atomic_dec_and_test(&page
->_count
);
345 * Try to grab a ref unless the page has a refcount of zero, return false if
347 * This can be called when MMU is off so it must not access
348 * any of the virtual mappings.
350 static inline int get_page_unless_zero(struct page
*page
)
352 return atomic_inc_not_zero(&page
->_count
);
356 * Try to drop a ref unless the page has a refcount of one, return false if
358 * This is to make sure that the refcount won't become zero after this drop.
359 * This can be called when MMU is off so it must not access
360 * any of the virtual mappings.
362 static inline int put_page_unless_one(struct page
*page
)
364 return atomic_add_unless(&page
->_count
, -1, 1);
367 extern int page_is_ram(unsigned long pfn
);
368 extern int region_is_ram(resource_size_t phys_addr
, unsigned long size
);
370 /* Support for virtually mapped pages */
371 struct page
*vmalloc_to_page(const void *addr
);
372 unsigned long vmalloc_to_pfn(const void *addr
);
375 * Determine if an address is within the vmalloc range
377 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
378 * is no special casing required.
380 static inline int is_vmalloc_addr(const void *x
)
383 unsigned long addr
= (unsigned long)x
;
385 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
391 extern int is_vmalloc_or_module_addr(const void *x
);
393 static inline int is_vmalloc_or_module_addr(const void *x
)
399 extern void kvfree(const void *addr
);
401 static inline void compound_lock(struct page
*page
)
403 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
404 VM_BUG_ON_PAGE(PageSlab(page
), page
);
405 bit_spin_lock(PG_compound_lock
, &page
->flags
);
409 static inline void compound_unlock(struct page
*page
)
411 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
412 VM_BUG_ON_PAGE(PageSlab(page
), page
);
413 bit_spin_unlock(PG_compound_lock
, &page
->flags
);
417 static inline unsigned long compound_lock_irqsave(struct page
*page
)
419 unsigned long uninitialized_var(flags
);
420 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
421 local_irq_save(flags
);
427 static inline void compound_unlock_irqrestore(struct page
*page
,
430 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
431 compound_unlock(page
);
432 local_irq_restore(flags
);
436 static inline struct page
*compound_head_by_tail(struct page
*tail
)
438 struct page
*head
= tail
->first_page
;
441 * page->first_page may be a dangling pointer to an old
442 * compound page, so recheck that it is still a tail
443 * page before returning.
446 if (likely(PageTail(tail
)))
451 static inline struct page
*compound_head(struct page
*page
)
453 if (unlikely(PageTail(page
)))
454 return compound_head_by_tail(page
);
459 * The atomic page->_mapcount, starts from -1: so that transitions
460 * both from it and to it can be tracked, using atomic_inc_and_test
461 * and atomic_add_negative(-1).
463 static inline void page_mapcount_reset(struct page
*page
)
465 atomic_set(&(page
)->_mapcount
, -1);
468 static inline int page_mapcount(struct page
*page
)
470 return atomic_read(&(page
)->_mapcount
) + 1;
473 static inline int page_count(struct page
*page
)
475 return atomic_read(&compound_head(page
)->_count
);
478 #ifdef CONFIG_HUGETLB_PAGE
479 extern int PageHeadHuge(struct page
*page_head
);
480 #else /* CONFIG_HUGETLB_PAGE */
481 static inline int PageHeadHuge(struct page
*page_head
)
485 #endif /* CONFIG_HUGETLB_PAGE */
487 static inline bool __compound_tail_refcounted(struct page
*page
)
489 return !PageSlab(page
) && !PageHeadHuge(page
);
493 * This takes a head page as parameter and tells if the
494 * tail page reference counting can be skipped.
496 * For this to be safe, PageSlab and PageHeadHuge must remain true on
497 * any given page where they return true here, until all tail pins
498 * have been released.
500 static inline bool compound_tail_refcounted(struct page
*page
)
502 VM_BUG_ON_PAGE(!PageHead(page
), page
);
503 return __compound_tail_refcounted(page
);
506 static inline void get_huge_page_tail(struct page
*page
)
509 * __split_huge_page_refcount() cannot run from under us.
511 VM_BUG_ON_PAGE(!PageTail(page
), page
);
512 VM_BUG_ON_PAGE(page_mapcount(page
) < 0, page
);
513 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) != 0, page
);
514 if (compound_tail_refcounted(page
->first_page
))
515 atomic_inc(&page
->_mapcount
);
518 extern bool __get_page_tail(struct page
*page
);
520 static inline void get_page(struct page
*page
)
522 if (unlikely(PageTail(page
)))
523 if (likely(__get_page_tail(page
)))
526 * Getting a normal page or the head of a compound page
527 * requires to already have an elevated page->_count.
529 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) <= 0, page
);
530 atomic_inc(&page
->_count
);
533 static inline struct page
*virt_to_head_page(const void *x
)
535 struct page
*page
= virt_to_page(x
);
536 return compound_head(page
);
540 * Setup the page count before being freed into the page allocator for
541 * the first time (boot or memory hotplug)
543 static inline void init_page_count(struct page
*page
)
545 atomic_set(&page
->_count
, 1);
549 * PageBuddy() indicate that the page is free and in the buddy system
550 * (see mm/page_alloc.c).
552 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
553 * -2 so that an underflow of the page_mapcount() won't be mistaken
554 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
555 * efficiently by most CPU architectures.
557 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
559 static inline int PageBuddy(struct page
*page
)
561 return atomic_read(&page
->_mapcount
) == PAGE_BUDDY_MAPCOUNT_VALUE
;
564 static inline void __SetPageBuddy(struct page
*page
)
566 VM_BUG_ON_PAGE(atomic_read(&page
->_mapcount
) != -1, page
);
567 atomic_set(&page
->_mapcount
, PAGE_BUDDY_MAPCOUNT_VALUE
);
570 static inline void __ClearPageBuddy(struct page
*page
)
572 VM_BUG_ON_PAGE(!PageBuddy(page
), page
);
573 atomic_set(&page
->_mapcount
, -1);
576 #define PAGE_BALLOON_MAPCOUNT_VALUE (-256)
578 static inline int PageBalloon(struct page
*page
)
580 return atomic_read(&page
->_mapcount
) == PAGE_BALLOON_MAPCOUNT_VALUE
;
583 static inline void __SetPageBalloon(struct page
*page
)
585 VM_BUG_ON_PAGE(atomic_read(&page
->_mapcount
) != -1, page
);
586 atomic_set(&page
->_mapcount
, PAGE_BALLOON_MAPCOUNT_VALUE
);
589 static inline void __ClearPageBalloon(struct page
*page
)
591 VM_BUG_ON_PAGE(!PageBalloon(page
), page
);
592 atomic_set(&page
->_mapcount
, -1);
595 void put_page(struct page
*page
);
596 void put_pages_list(struct list_head
*pages
);
598 void split_page(struct page
*page
, unsigned int order
);
599 int split_free_page(struct page
*page
);
602 * Compound pages have a destructor function. Provide a
603 * prototype for that function and accessor functions.
604 * These are _only_ valid on the head of a PG_compound page.
606 typedef void compound_page_dtor(struct page
*);
608 static inline void set_compound_page_dtor(struct page
*page
,
609 compound_page_dtor
*dtor
)
611 page
[1].lru
.next
= (void *)dtor
;
614 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
616 return (compound_page_dtor
*)page
[1].lru
.next
;
619 static inline int compound_order(struct page
*page
)
623 return (unsigned long)page
[1].lru
.prev
;
626 static inline void set_compound_order(struct page
*page
, unsigned long order
)
628 page
[1].lru
.prev
= (void *)order
;
633 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
634 * servicing faults for write access. In the normal case, do always want
635 * pte_mkwrite. But get_user_pages can cause write faults for mappings
636 * that do not have writing enabled, when used by access_process_vm.
638 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
640 if (likely(vma
->vm_flags
& VM_WRITE
))
641 pte
= pte_mkwrite(pte
);
645 void do_set_pte(struct vm_area_struct
*vma
, unsigned long address
,
646 struct page
*page
, pte_t
*pte
, bool write
, bool anon
);
650 * Multiple processes may "see" the same page. E.g. for untouched
651 * mappings of /dev/null, all processes see the same page full of
652 * zeroes, and text pages of executables and shared libraries have
653 * only one copy in memory, at most, normally.
655 * For the non-reserved pages, page_count(page) denotes a reference count.
656 * page_count() == 0 means the page is free. page->lru is then used for
657 * freelist management in the buddy allocator.
658 * page_count() > 0 means the page has been allocated.
660 * Pages are allocated by the slab allocator in order to provide memory
661 * to kmalloc and kmem_cache_alloc. In this case, the management of the
662 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
663 * unless a particular usage is carefully commented. (the responsibility of
664 * freeing the kmalloc memory is the caller's, of course).
666 * A page may be used by anyone else who does a __get_free_page().
667 * In this case, page_count still tracks the references, and should only
668 * be used through the normal accessor functions. The top bits of page->flags
669 * and page->virtual store page management information, but all other fields
670 * are unused and could be used privately, carefully. The management of this
671 * page is the responsibility of the one who allocated it, and those who have
672 * subsequently been given references to it.
674 * The other pages (we may call them "pagecache pages") are completely
675 * managed by the Linux memory manager: I/O, buffers, swapping etc.
676 * The following discussion applies only to them.
678 * A pagecache page contains an opaque `private' member, which belongs to the
679 * page's address_space. Usually, this is the address of a circular list of
680 * the page's disk buffers. PG_private must be set to tell the VM to call
681 * into the filesystem to release these pages.
683 * A page may belong to an inode's memory mapping. In this case, page->mapping
684 * is the pointer to the inode, and page->index is the file offset of the page,
685 * in units of PAGE_CACHE_SIZE.
687 * If pagecache pages are not associated with an inode, they are said to be
688 * anonymous pages. These may become associated with the swapcache, and in that
689 * case PG_swapcache is set, and page->private is an offset into the swapcache.
691 * In either case (swapcache or inode backed), the pagecache itself holds one
692 * reference to the page. Setting PG_private should also increment the
693 * refcount. The each user mapping also has a reference to the page.
695 * The pagecache pages are stored in a per-mapping radix tree, which is
696 * rooted at mapping->page_tree, and indexed by offset.
697 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
698 * lists, we instead now tag pages as dirty/writeback in the radix tree.
700 * All pagecache pages may be subject to I/O:
701 * - inode pages may need to be read from disk,
702 * - inode pages which have been modified and are MAP_SHARED may need
703 * to be written back to the inode on disk,
704 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
705 * modified may need to be swapped out to swap space and (later) to be read
710 * The zone field is never updated after free_area_init_core()
711 * sets it, so none of the operations on it need to be atomic.
714 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
715 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
716 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
717 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
718 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
721 * Define the bit shifts to access each section. For non-existent
722 * sections we define the shift as 0; that plus a 0 mask ensures
723 * the compiler will optimise away reference to them.
725 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
726 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
727 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
728 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
730 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
731 #ifdef NODE_NOT_IN_PAGE_FLAGS
732 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
733 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
734 SECTIONS_PGOFF : ZONES_PGOFF)
736 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
737 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
738 NODES_PGOFF : ZONES_PGOFF)
741 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
743 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
744 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
747 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
748 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
749 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
750 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
751 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
753 static inline enum zone_type
page_zonenum(const struct page
*page
)
755 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
758 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
759 #define SECTION_IN_PAGE_FLAGS
763 * The identification function is mainly used by the buddy allocator for
764 * determining if two pages could be buddies. We are not really identifying
765 * the zone since we could be using the section number id if we do not have
766 * node id available in page flags.
767 * We only guarantee that it will return the same value for two combinable
770 static inline int page_zone_id(struct page
*page
)
772 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
775 static inline int zone_to_nid(struct zone
*zone
)
784 #ifdef NODE_NOT_IN_PAGE_FLAGS
785 extern int page_to_nid(const struct page
*page
);
787 static inline int page_to_nid(const struct page
*page
)
789 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
793 #ifdef CONFIG_NUMA_BALANCING
794 static inline int cpu_pid_to_cpupid(int cpu
, int pid
)
796 return ((cpu
& LAST__CPU_MASK
) << LAST__PID_SHIFT
) | (pid
& LAST__PID_MASK
);
799 static inline int cpupid_to_pid(int cpupid
)
801 return cpupid
& LAST__PID_MASK
;
804 static inline int cpupid_to_cpu(int cpupid
)
806 return (cpupid
>> LAST__PID_SHIFT
) & LAST__CPU_MASK
;
809 static inline int cpupid_to_nid(int cpupid
)
811 return cpu_to_node(cpupid_to_cpu(cpupid
));
814 static inline bool cpupid_pid_unset(int cpupid
)
816 return cpupid_to_pid(cpupid
) == (-1 & LAST__PID_MASK
);
819 static inline bool cpupid_cpu_unset(int cpupid
)
821 return cpupid_to_cpu(cpupid
) == (-1 & LAST__CPU_MASK
);
824 static inline bool __cpupid_match_pid(pid_t task_pid
, int cpupid
)
826 return (task_pid
& LAST__PID_MASK
) == cpupid_to_pid(cpupid
);
829 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
830 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
831 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
833 return xchg(&page
->_last_cpupid
, cpupid
& LAST_CPUPID_MASK
);
836 static inline int page_cpupid_last(struct page
*page
)
838 return page
->_last_cpupid
;
840 static inline void page_cpupid_reset_last(struct page
*page
)
842 page
->_last_cpupid
= -1 & LAST_CPUPID_MASK
;
845 static inline int page_cpupid_last(struct page
*page
)
847 return (page
->flags
>> LAST_CPUPID_PGSHIFT
) & LAST_CPUPID_MASK
;
850 extern int page_cpupid_xchg_last(struct page
*page
, int cpupid
);
852 static inline void page_cpupid_reset_last(struct page
*page
)
854 int cpupid
= (1 << LAST_CPUPID_SHIFT
) - 1;
856 page
->flags
&= ~(LAST_CPUPID_MASK
<< LAST_CPUPID_PGSHIFT
);
857 page
->flags
|= (cpupid
& LAST_CPUPID_MASK
) << LAST_CPUPID_PGSHIFT
;
859 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
860 #else /* !CONFIG_NUMA_BALANCING */
861 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
863 return page_to_nid(page
); /* XXX */
866 static inline int page_cpupid_last(struct page
*page
)
868 return page_to_nid(page
); /* XXX */
871 static inline int cpupid_to_nid(int cpupid
)
876 static inline int cpupid_to_pid(int cpupid
)
881 static inline int cpupid_to_cpu(int cpupid
)
886 static inline int cpu_pid_to_cpupid(int nid
, int pid
)
891 static inline bool cpupid_pid_unset(int cpupid
)
896 static inline void page_cpupid_reset_last(struct page
*page
)
900 static inline bool cpupid_match_pid(struct task_struct
*task
, int cpupid
)
904 #endif /* CONFIG_NUMA_BALANCING */
906 static inline struct zone
*page_zone(const struct page
*page
)
908 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
911 #ifdef SECTION_IN_PAGE_FLAGS
912 static inline void set_page_section(struct page
*page
, unsigned long section
)
914 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
915 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
918 static inline unsigned long page_to_section(const struct page
*page
)
920 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
924 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
926 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
927 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
930 static inline void set_page_node(struct page
*page
, unsigned long node
)
932 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
933 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
936 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
937 unsigned long node
, unsigned long pfn
)
939 set_page_zone(page
, zone
);
940 set_page_node(page
, node
);
941 #ifdef SECTION_IN_PAGE_FLAGS
942 set_page_section(page
, pfn_to_section_nr(pfn
));
947 * Some inline functions in vmstat.h depend on page_zone()
949 #include <linux/vmstat.h>
951 static __always_inline
void *lowmem_page_address(const struct page
*page
)
953 return __va(PFN_PHYS(page_to_pfn(page
)));
956 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
957 #define HASHED_PAGE_VIRTUAL
960 #if defined(WANT_PAGE_VIRTUAL)
961 static inline void *page_address(const struct page
*page
)
963 return page
->virtual;
965 static inline void set_page_address(struct page
*page
, void *address
)
967 page
->virtual = address
;
969 #define page_address_init() do { } while(0)
972 #if defined(HASHED_PAGE_VIRTUAL)
973 void *page_address(const struct page
*page
);
974 void set_page_address(struct page
*page
, void *virtual);
975 void page_address_init(void);
978 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
979 #define page_address(page) lowmem_page_address(page)
980 #define set_page_address(page, address) do { } while(0)
981 #define page_address_init() do { } while(0)
985 * On an anonymous page mapped into a user virtual memory area,
986 * page->mapping points to its anon_vma, not to a struct address_space;
987 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
989 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
990 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
991 * and then page->mapping points, not to an anon_vma, but to a private
992 * structure which KSM associates with that merged page. See ksm.h.
994 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
996 * Please note that, confusingly, "page_mapping" refers to the inode
997 * address_space which maps the page from disk; whereas "page_mapped"
998 * refers to user virtual address space into which the page is mapped.
1000 #define PAGE_MAPPING_ANON 1
1001 #define PAGE_MAPPING_KSM 2
1002 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
1004 extern struct address_space
*page_mapping(struct page
*page
);
1006 /* Neutral page->mapping pointer to address_space or anon_vma or other */
1007 static inline void *page_rmapping(struct page
*page
)
1009 return (void *)((unsigned long)page
->mapping
& ~PAGE_MAPPING_FLAGS
);
1012 extern struct address_space
*__page_file_mapping(struct page
*);
1015 struct address_space
*page_file_mapping(struct page
*page
)
1017 if (unlikely(PageSwapCache(page
)))
1018 return __page_file_mapping(page
);
1020 return page
->mapping
;
1023 static inline int PageAnon(struct page
*page
)
1025 return ((unsigned long)page
->mapping
& PAGE_MAPPING_ANON
) != 0;
1029 * Return the pagecache index of the passed page. Regular pagecache pages
1030 * use ->index whereas swapcache pages use ->private
1032 static inline pgoff_t
page_index(struct page
*page
)
1034 if (unlikely(PageSwapCache(page
)))
1035 return page_private(page
);
1039 extern pgoff_t
__page_file_index(struct page
*page
);
1042 * Return the file index of the page. Regular pagecache pages use ->index
1043 * whereas swapcache pages use swp_offset(->private)
1045 static inline pgoff_t
page_file_index(struct page
*page
)
1047 if (unlikely(PageSwapCache(page
)))
1048 return __page_file_index(page
);
1054 * Return true if this page is mapped into pagetables.
1056 static inline int page_mapped(struct page
*page
)
1058 return atomic_read(&(page
)->_mapcount
) >= 0;
1062 * Different kinds of faults, as returned by handle_mm_fault().
1063 * Used to decide whether a process gets delivered SIGBUS or
1064 * just gets major/minor fault counters bumped up.
1067 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1069 #define VM_FAULT_OOM 0x0001
1070 #define VM_FAULT_SIGBUS 0x0002
1071 #define VM_FAULT_MAJOR 0x0004
1072 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1073 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1074 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1076 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1077 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1078 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1079 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1081 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1083 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
1084 VM_FAULT_FALLBACK | VM_FAULT_HWPOISON_LARGE)
1086 /* Encode hstate index for a hwpoisoned large page */
1087 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1088 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1091 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1093 extern void pagefault_out_of_memory(void);
1095 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1098 * Flags passed to show_mem() and show_free_areas() to suppress output in
1101 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1103 extern void show_free_areas(unsigned int flags
);
1104 extern bool skip_free_areas_node(unsigned int flags
, int nid
);
1106 int shmem_zero_setup(struct vm_area_struct
*);
1108 bool shmem_mapping(struct address_space
*mapping
);
1110 static inline bool shmem_mapping(struct address_space
*mapping
)
1116 extern int can_do_mlock(void);
1117 extern int user_shm_lock(size_t, struct user_struct
*);
1118 extern void user_shm_unlock(size_t, struct user_struct
*);
1121 * Parameter block passed down to zap_pte_range in exceptional cases.
1123 struct zap_details
{
1124 struct vm_area_struct
*nonlinear_vma
; /* Check page->index if set */
1125 struct address_space
*check_mapping
; /* Check page->mapping if set */
1126 pgoff_t first_index
; /* Lowest page->index to unmap */
1127 pgoff_t last_index
; /* Highest page->index to unmap */
1130 struct page
*vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
1133 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
1134 unsigned long size
);
1135 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
1136 unsigned long size
, struct zap_details
*);
1137 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
1138 unsigned long start
, unsigned long end
);
1141 * mm_walk - callbacks for walk_page_range
1142 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
1143 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1144 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1145 * this handler is required to be able to handle
1146 * pmd_trans_huge() pmds. They may simply choose to
1147 * split_huge_page() instead of handling it explicitly.
1148 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1149 * @pte_hole: if set, called for each hole at all levels
1150 * @hugetlb_entry: if set, called for each hugetlb entry
1151 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
1154 * (see walk_page_range for more details)
1157 int (*pgd_entry
)(pgd_t
*pgd
, unsigned long addr
,
1158 unsigned long next
, struct mm_walk
*walk
);
1159 int (*pud_entry
)(pud_t
*pud
, unsigned long addr
,
1160 unsigned long next
, struct mm_walk
*walk
);
1161 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
1162 unsigned long next
, struct mm_walk
*walk
);
1163 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
1164 unsigned long next
, struct mm_walk
*walk
);
1165 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
1166 struct mm_walk
*walk
);
1167 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
1168 unsigned long addr
, unsigned long next
,
1169 struct mm_walk
*walk
);
1170 struct mm_struct
*mm
;
1174 int walk_page_range(unsigned long addr
, unsigned long end
,
1175 struct mm_walk
*walk
);
1176 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1177 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1178 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1179 struct vm_area_struct
*vma
);
1180 void unmap_mapping_range(struct address_space
*mapping
,
1181 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1182 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1183 unsigned long *pfn
);
1184 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1185 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1186 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1187 void *buf
, int len
, int write
);
1189 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1190 loff_t
const holebegin
, loff_t
const holelen
)
1192 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1195 extern void truncate_pagecache(struct inode
*inode
, loff_t
new);
1196 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1197 void pagecache_isize_extended(struct inode
*inode
, loff_t from
, loff_t to
);
1198 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1199 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1200 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1201 int invalidate_inode_page(struct page
*page
);
1204 extern int handle_mm_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1205 unsigned long address
, unsigned int flags
);
1206 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1207 unsigned long address
, unsigned int fault_flags
);
1209 static inline int handle_mm_fault(struct mm_struct
*mm
,
1210 struct vm_area_struct
*vma
, unsigned long address
,
1213 /* should never happen if there's no MMU */
1215 return VM_FAULT_SIGBUS
;
1217 static inline int fixup_user_fault(struct task_struct
*tsk
,
1218 struct mm_struct
*mm
, unsigned long address
,
1219 unsigned int fault_flags
)
1221 /* should never happen if there's no MMU */
1227 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
1228 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1229 void *buf
, int len
, int write
);
1231 long __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1232 unsigned long start
, unsigned long nr_pages
,
1233 unsigned int foll_flags
, struct page
**pages
,
1234 struct vm_area_struct
**vmas
, int *nonblocking
);
1235 long get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1236 unsigned long start
, unsigned long nr_pages
,
1237 int write
, int force
, struct page
**pages
,
1238 struct vm_area_struct
**vmas
);
1239 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1240 struct page
**pages
);
1242 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1243 struct page
**pages
);
1244 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1245 struct page
*get_dump_page(unsigned long addr
);
1247 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1248 extern void do_invalidatepage(struct page
*page
, unsigned int offset
,
1249 unsigned int length
);
1251 int __set_page_dirty_nobuffers(struct page
*page
);
1252 int __set_page_dirty_no_writeback(struct page
*page
);
1253 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1255 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1256 int set_page_dirty(struct page
*page
);
1257 int set_page_dirty_lock(struct page
*page
);
1258 int clear_page_dirty_for_io(struct page
*page
);
1259 int get_cmdline(struct task_struct
*task
, char *buffer
, int buflen
);
1261 /* Is the vma a continuation of the stack vma above it? */
1262 static inline int vma_growsdown(struct vm_area_struct
*vma
, unsigned long addr
)
1264 return vma
&& (vma
->vm_end
== addr
) && (vma
->vm_flags
& VM_GROWSDOWN
);
1267 static inline int stack_guard_page_start(struct vm_area_struct
*vma
,
1270 return (vma
->vm_flags
& VM_GROWSDOWN
) &&
1271 (vma
->vm_start
== addr
) &&
1272 !vma_growsdown(vma
->vm_prev
, addr
);
1275 /* Is the vma a continuation of the stack vma below it? */
1276 static inline int vma_growsup(struct vm_area_struct
*vma
, unsigned long addr
)
1278 return vma
&& (vma
->vm_start
== addr
) && (vma
->vm_flags
& VM_GROWSUP
);
1281 static inline int stack_guard_page_end(struct vm_area_struct
*vma
,
1284 return (vma
->vm_flags
& VM_GROWSUP
) &&
1285 (vma
->vm_end
== addr
) &&
1286 !vma_growsup(vma
->vm_next
, addr
);
1289 extern struct task_struct
*task_of_stack(struct task_struct
*task
,
1290 struct vm_area_struct
*vma
, bool in_group
);
1292 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1293 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1294 unsigned long new_addr
, unsigned long len
,
1295 bool need_rmap_locks
);
1296 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1297 unsigned long end
, pgprot_t newprot
,
1298 int dirty_accountable
, int prot_numa
);
1299 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1300 struct vm_area_struct
**pprev
, unsigned long start
,
1301 unsigned long end
, unsigned long newflags
);
1304 * doesn't attempt to fault and will return short.
1306 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1307 struct page
**pages
);
1309 * per-process(per-mm_struct) statistics.
1311 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1313 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1315 #ifdef SPLIT_RSS_COUNTING
1317 * counter is updated in asynchronous manner and may go to minus.
1318 * But it's never be expected number for users.
1323 return (unsigned long)val
;
1326 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1328 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1331 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1333 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1336 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1338 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1341 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1343 return get_mm_counter(mm
, MM_FILEPAGES
) +
1344 get_mm_counter(mm
, MM_ANONPAGES
);
1347 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1349 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1352 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1354 return max(mm
->hiwater_vm
, mm
->total_vm
);
1357 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1359 unsigned long _rss
= get_mm_rss(mm
);
1361 if ((mm
)->hiwater_rss
< _rss
)
1362 (mm
)->hiwater_rss
= _rss
;
1365 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1367 if (mm
->hiwater_vm
< mm
->total_vm
)
1368 mm
->hiwater_vm
= mm
->total_vm
;
1371 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1372 struct mm_struct
*mm
)
1374 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1376 if (*maxrss
< hiwater_rss
)
1377 *maxrss
= hiwater_rss
;
1380 #if defined(SPLIT_RSS_COUNTING)
1381 void sync_mm_rss(struct mm_struct
*mm
);
1383 static inline void sync_mm_rss(struct mm_struct
*mm
)
1388 int vma_wants_writenotify(struct vm_area_struct
*vma
);
1390 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1392 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1396 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1400 #ifdef __PAGETABLE_PUD_FOLDED
1401 static inline int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1402 unsigned long address
)
1407 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1410 #ifdef __PAGETABLE_PMD_FOLDED
1411 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1412 unsigned long address
)
1417 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1420 int __pte_alloc(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1421 pmd_t
*pmd
, unsigned long address
);
1422 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1425 * The following ifdef needed to get the 4level-fixup.h header to work.
1426 * Remove it when 4level-fixup.h has been removed.
1428 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1429 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
1431 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
1432 NULL
: pud_offset(pgd
, address
);
1435 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1437 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1438 NULL
: pmd_offset(pud
, address
);
1440 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1442 #if USE_SPLIT_PTE_PTLOCKS
1443 #if ALLOC_SPLIT_PTLOCKS
1444 void __init
ptlock_cache_init(void);
1445 extern bool ptlock_alloc(struct page
*page
);
1446 extern void ptlock_free(struct page
*page
);
1448 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1452 #else /* ALLOC_SPLIT_PTLOCKS */
1453 static inline void ptlock_cache_init(void)
1457 static inline bool ptlock_alloc(struct page
*page
)
1462 static inline void ptlock_free(struct page
*page
)
1466 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1470 #endif /* ALLOC_SPLIT_PTLOCKS */
1472 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1474 return ptlock_ptr(pmd_page(*pmd
));
1477 static inline bool ptlock_init(struct page
*page
)
1480 * prep_new_page() initialize page->private (and therefore page->ptl)
1481 * with 0. Make sure nobody took it in use in between.
1483 * It can happen if arch try to use slab for page table allocation:
1484 * slab code uses page->slab_cache and page->first_page (for tail
1485 * pages), which share storage with page->ptl.
1487 VM_BUG_ON_PAGE(*(unsigned long *)&page
->ptl
, page
);
1488 if (!ptlock_alloc(page
))
1490 spin_lock_init(ptlock_ptr(page
));
1494 /* Reset page->mapping so free_pages_check won't complain. */
1495 static inline void pte_lock_deinit(struct page
*page
)
1497 page
->mapping
= NULL
;
1501 #else /* !USE_SPLIT_PTE_PTLOCKS */
1503 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1505 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1507 return &mm
->page_table_lock
;
1509 static inline void ptlock_cache_init(void) {}
1510 static inline bool ptlock_init(struct page
*page
) { return true; }
1511 static inline void pte_lock_deinit(struct page
*page
) {}
1512 #endif /* USE_SPLIT_PTE_PTLOCKS */
1514 static inline void pgtable_init(void)
1516 ptlock_cache_init();
1517 pgtable_cache_init();
1520 static inline bool pgtable_page_ctor(struct page
*page
)
1522 inc_zone_page_state(page
, NR_PAGETABLE
);
1523 return ptlock_init(page
);
1526 static inline void pgtable_page_dtor(struct page
*page
)
1528 pte_lock_deinit(page
);
1529 dec_zone_page_state(page
, NR_PAGETABLE
);
1532 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1534 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1535 pte_t *__pte = pte_offset_map(pmd, address); \
1541 #define pte_unmap_unlock(pte, ptl) do { \
1546 #define pte_alloc_map(mm, vma, pmd, address) \
1547 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1549 NULL: pte_offset_map(pmd, address))
1551 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1552 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1554 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1556 #define pte_alloc_kernel(pmd, address) \
1557 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1558 NULL: pte_offset_kernel(pmd, address))
1560 #if USE_SPLIT_PMD_PTLOCKS
1562 static struct page
*pmd_to_page(pmd_t
*pmd
)
1564 unsigned long mask
= ~(PTRS_PER_PMD
* sizeof(pmd_t
) - 1);
1565 return virt_to_page((void *)((unsigned long) pmd
& mask
));
1568 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1570 return ptlock_ptr(pmd_to_page(pmd
));
1573 static inline bool pgtable_pmd_page_ctor(struct page
*page
)
1575 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1576 page
->pmd_huge_pte
= NULL
;
1578 return ptlock_init(page
);
1581 static inline void pgtable_pmd_page_dtor(struct page
*page
)
1583 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1584 VM_BUG_ON_PAGE(page
->pmd_huge_pte
, page
);
1589 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1593 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1595 return &mm
->page_table_lock
;
1598 static inline bool pgtable_pmd_page_ctor(struct page
*page
) { return true; }
1599 static inline void pgtable_pmd_page_dtor(struct page
*page
) {}
1601 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1605 static inline spinlock_t
*pmd_lock(struct mm_struct
*mm
, pmd_t
*pmd
)
1607 spinlock_t
*ptl
= pmd_lockptr(mm
, pmd
);
1612 extern void free_area_init(unsigned long * zones_size
);
1613 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1614 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1615 extern void free_initmem(void);
1618 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1619 * into the buddy system. The freed pages will be poisoned with pattern
1620 * "poison" if it's within range [0, UCHAR_MAX].
1621 * Return pages freed into the buddy system.
1623 extern unsigned long free_reserved_area(void *start
, void *end
,
1624 int poison
, char *s
);
1626 #ifdef CONFIG_HIGHMEM
1628 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1629 * and totalram_pages.
1631 extern void free_highmem_page(struct page
*page
);
1634 extern void adjust_managed_page_count(struct page
*page
, long count
);
1635 extern void mem_init_print_info(const char *str
);
1637 /* Free the reserved page into the buddy system, so it gets managed. */
1638 static inline void __free_reserved_page(struct page
*page
)
1640 ClearPageReserved(page
);
1641 init_page_count(page
);
1645 static inline void free_reserved_page(struct page
*page
)
1647 __free_reserved_page(page
);
1648 adjust_managed_page_count(page
, 1);
1651 static inline void mark_page_reserved(struct page
*page
)
1653 SetPageReserved(page
);
1654 adjust_managed_page_count(page
, -1);
1658 * Default method to free all the __init memory into the buddy system.
1659 * The freed pages will be poisoned with pattern "poison" if it's within
1660 * range [0, UCHAR_MAX].
1661 * Return pages freed into the buddy system.
1663 static inline unsigned long free_initmem_default(int poison
)
1665 extern char __init_begin
[], __init_end
[];
1667 return free_reserved_area(&__init_begin
, &__init_end
,
1668 poison
, "unused kernel");
1671 static inline unsigned long get_num_physpages(void)
1674 unsigned long phys_pages
= 0;
1676 for_each_online_node(nid
)
1677 phys_pages
+= node_present_pages(nid
);
1682 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1684 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1685 * zones, allocate the backing mem_map and account for memory holes in a more
1686 * architecture independent manner. This is a substitute for creating the
1687 * zone_sizes[] and zholes_size[] arrays and passing them to
1688 * free_area_init_node()
1690 * An architecture is expected to register range of page frames backed by
1691 * physical memory with memblock_add[_node]() before calling
1692 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1693 * usage, an architecture is expected to do something like
1695 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1697 * for_each_valid_physical_page_range()
1698 * memblock_add_node(base, size, nid)
1699 * free_area_init_nodes(max_zone_pfns);
1701 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1702 * registered physical page range. Similarly
1703 * sparse_memory_present_with_active_regions() calls memory_present() for
1704 * each range when SPARSEMEM is enabled.
1706 * See mm/page_alloc.c for more information on each function exposed by
1707 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1709 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1710 unsigned long node_map_pfn_alignment(void);
1711 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1712 unsigned long end_pfn
);
1713 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1714 unsigned long end_pfn
);
1715 extern void get_pfn_range_for_nid(unsigned int nid
,
1716 unsigned long *start_pfn
, unsigned long *end_pfn
);
1717 extern unsigned long find_min_pfn_with_active_regions(void);
1718 extern void free_bootmem_with_active_regions(int nid
,
1719 unsigned long max_low_pfn
);
1720 extern void sparse_memory_present_with_active_regions(int nid
);
1722 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1724 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1725 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1726 static inline int __early_pfn_to_nid(unsigned long pfn
)
1731 /* please see mm/page_alloc.c */
1732 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1733 /* there is a per-arch backend function. */
1734 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
);
1737 extern void set_dma_reserve(unsigned long new_dma_reserve
);
1738 extern void memmap_init_zone(unsigned long, int, unsigned long,
1739 unsigned long, enum memmap_context
);
1740 extern void setup_per_zone_wmarks(void);
1741 extern int __meminit
init_per_zone_wmark_min(void);
1742 extern void mem_init(void);
1743 extern void __init
mmap_init(void);
1744 extern void show_mem(unsigned int flags
);
1745 extern void si_meminfo(struct sysinfo
* val
);
1746 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
1748 extern __printf(3, 4)
1749 void warn_alloc_failed(gfp_t gfp_mask
, int order
, const char *fmt
, ...);
1751 extern void setup_per_cpu_pageset(void);
1753 extern void zone_pcp_update(struct zone
*zone
);
1754 extern void zone_pcp_reset(struct zone
*zone
);
1757 extern int min_free_kbytes
;
1760 extern atomic_long_t mmap_pages_allocated
;
1761 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
1763 /* interval_tree.c */
1764 void vma_interval_tree_insert(struct vm_area_struct
*node
,
1765 struct rb_root
*root
);
1766 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
1767 struct vm_area_struct
*prev
,
1768 struct rb_root
*root
);
1769 void vma_interval_tree_remove(struct vm_area_struct
*node
,
1770 struct rb_root
*root
);
1771 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root
*root
,
1772 unsigned long start
, unsigned long last
);
1773 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
1774 unsigned long start
, unsigned long last
);
1776 #define vma_interval_tree_foreach(vma, root, start, last) \
1777 for (vma = vma_interval_tree_iter_first(root, start, last); \
1778 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1780 static inline void vma_nonlinear_insert(struct vm_area_struct
*vma
,
1781 struct list_head
*list
)
1783 list_add_tail(&vma
->shared
.nonlinear
, list
);
1786 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
1787 struct rb_root
*root
);
1788 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
1789 struct rb_root
*root
);
1790 struct anon_vma_chain
*anon_vma_interval_tree_iter_first(
1791 struct rb_root
*root
, unsigned long start
, unsigned long last
);
1792 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
1793 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
1794 #ifdef CONFIG_DEBUG_VM_RB
1795 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
1798 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1799 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1800 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1803 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
1804 extern int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
1805 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
1806 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
1807 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
1808 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
1809 struct mempolicy
*);
1810 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
1811 extern int split_vma(struct mm_struct
*,
1812 struct vm_area_struct
*, unsigned long addr
, int new_below
);
1813 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
1814 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
1815 struct rb_node
**, struct rb_node
*);
1816 extern void unlink_file_vma(struct vm_area_struct
*);
1817 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
1818 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
1819 bool *need_rmap_locks
);
1820 extern void exit_mmap(struct mm_struct
*);
1822 static inline int check_data_rlimit(unsigned long rlim
,
1824 unsigned long start
,
1825 unsigned long end_data
,
1826 unsigned long start_data
)
1828 if (rlim
< RLIM_INFINITY
) {
1829 if (((new - start
) + (end_data
- start_data
)) > rlim
)
1836 extern int mm_take_all_locks(struct mm_struct
*mm
);
1837 extern void mm_drop_all_locks(struct mm_struct
*mm
);
1839 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
1840 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
1842 extern int may_expand_vm(struct mm_struct
*mm
, unsigned long npages
);
1843 extern struct vm_area_struct
*_install_special_mapping(struct mm_struct
*mm
,
1844 unsigned long addr
, unsigned long len
,
1845 unsigned long flags
,
1846 const struct vm_special_mapping
*spec
);
1847 /* This is an obsolete alternative to _install_special_mapping. */
1848 extern int install_special_mapping(struct mm_struct
*mm
,
1849 unsigned long addr
, unsigned long len
,
1850 unsigned long flags
, struct page
**pages
);
1852 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1854 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
1855 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
);
1856 extern unsigned long do_mmap_pgoff(struct file
*file
, unsigned long addr
,
1857 unsigned long len
, unsigned long prot
, unsigned long flags
,
1858 unsigned long pgoff
, unsigned long *populate
);
1859 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
1862 extern int __mm_populate(unsigned long addr
, unsigned long len
,
1864 static inline void mm_populate(unsigned long addr
, unsigned long len
)
1867 (void) __mm_populate(addr
, len
, 1);
1870 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
1873 /* These take the mm semaphore themselves */
1874 extern unsigned long vm_brk(unsigned long, unsigned long);
1875 extern int vm_munmap(unsigned long, size_t);
1876 extern unsigned long vm_mmap(struct file
*, unsigned long,
1877 unsigned long, unsigned long,
1878 unsigned long, unsigned long);
1880 struct vm_unmapped_area_info
{
1881 #define VM_UNMAPPED_AREA_TOPDOWN 1
1882 unsigned long flags
;
1883 unsigned long length
;
1884 unsigned long low_limit
;
1885 unsigned long high_limit
;
1886 unsigned long align_mask
;
1887 unsigned long align_offset
;
1890 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
1891 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
1894 * Search for an unmapped address range.
1896 * We are looking for a range that:
1897 * - does not intersect with any VMA;
1898 * - is contained within the [low_limit, high_limit) interval;
1899 * - is at least the desired size.
1900 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1902 static inline unsigned long
1903 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
1905 if (!(info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
))
1906 return unmapped_area(info
);
1908 return unmapped_area_topdown(info
);
1912 extern void truncate_inode_pages(struct address_space
*, loff_t
);
1913 extern void truncate_inode_pages_range(struct address_space
*,
1914 loff_t lstart
, loff_t lend
);
1915 extern void truncate_inode_pages_final(struct address_space
*);
1917 /* generic vm_area_ops exported for stackable file systems */
1918 extern int filemap_fault(struct vm_area_struct
*, struct vm_fault
*);
1919 extern void filemap_map_pages(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1920 extern int filemap_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1922 /* mm/page-writeback.c */
1923 int write_one_page(struct page
*page
, int wait
);
1924 void task_dirty_inc(struct task_struct
*tsk
);
1927 #define VM_MAX_READAHEAD 128 /* kbytes */
1928 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1930 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
1931 pgoff_t offset
, unsigned long nr_to_read
);
1933 void page_cache_sync_readahead(struct address_space
*mapping
,
1934 struct file_ra_state
*ra
,
1937 unsigned long size
);
1939 void page_cache_async_readahead(struct address_space
*mapping
,
1940 struct file_ra_state
*ra
,
1944 unsigned long size
);
1946 unsigned long max_sane_readahead(unsigned long nr
);
1948 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1949 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
1951 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1952 extern int expand_downwards(struct vm_area_struct
*vma
,
1953 unsigned long address
);
1955 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
1957 #define expand_upwards(vma, address) do { } while (0)
1960 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1961 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
1962 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
1963 struct vm_area_struct
**pprev
);
1965 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1966 NULL if none. Assume start_addr < end_addr. */
1967 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
1969 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
1971 if (vma
&& end_addr
<= vma
->vm_start
)
1976 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
1978 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
1981 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1982 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
1983 unsigned long vm_start
, unsigned long vm_end
)
1985 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
1987 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
1994 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
1995 void vma_set_page_prot(struct vm_area_struct
*vma
);
1997 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
2001 static inline void vma_set_page_prot(struct vm_area_struct
*vma
)
2003 vma
->vm_page_prot
= vm_get_page_prot(vma
->vm_flags
);
2007 #ifdef CONFIG_NUMA_BALANCING
2008 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
2009 unsigned long start
, unsigned long end
);
2012 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
2013 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
2014 unsigned long pfn
, unsigned long size
, pgprot_t
);
2015 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
2016 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
2018 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
2020 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
2023 struct page
*follow_page_mask(struct vm_area_struct
*vma
,
2024 unsigned long address
, unsigned int foll_flags
,
2025 unsigned int *page_mask
);
2027 static inline struct page
*follow_page(struct vm_area_struct
*vma
,
2028 unsigned long address
, unsigned int foll_flags
)
2030 unsigned int unused_page_mask
;
2031 return follow_page_mask(vma
, address
, foll_flags
, &unused_page_mask
);
2034 #define FOLL_WRITE 0x01 /* check pte is writable */
2035 #define FOLL_TOUCH 0x02 /* mark page accessed */
2036 #define FOLL_GET 0x04 /* do get_page on page */
2037 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2038 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2039 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2040 * and return without waiting upon it */
2041 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
2042 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2043 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2044 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2045 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2046 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2048 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
2050 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
2051 unsigned long size
, pte_fn_t fn
, void *data
);
2053 #ifdef CONFIG_PROC_FS
2054 void vm_stat_account(struct mm_struct
*, unsigned long, struct file
*, long);
2056 static inline void vm_stat_account(struct mm_struct
*mm
,
2057 unsigned long flags
, struct file
*file
, long pages
)
2059 mm
->total_vm
+= pages
;
2061 #endif /* CONFIG_PROC_FS */
2063 #ifdef CONFIG_DEBUG_PAGEALLOC
2064 extern bool _debug_pagealloc_enabled
;
2065 extern void __kernel_map_pages(struct page
*page
, int numpages
, int enable
);
2067 static inline bool debug_pagealloc_enabled(void)
2069 return _debug_pagealloc_enabled
;
2073 kernel_map_pages(struct page
*page
, int numpages
, int enable
)
2075 if (!debug_pagealloc_enabled())
2078 __kernel_map_pages(page
, numpages
, enable
);
2080 #ifdef CONFIG_HIBERNATION
2081 extern bool kernel_page_present(struct page
*page
);
2082 #endif /* CONFIG_HIBERNATION */
2085 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
2086 #ifdef CONFIG_HIBERNATION
2087 static inline bool kernel_page_present(struct page
*page
) { return true; }
2088 #endif /* CONFIG_HIBERNATION */
2091 #ifdef __HAVE_ARCH_GATE_AREA
2092 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
2093 extern int in_gate_area_no_mm(unsigned long addr
);
2094 extern int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
2096 static inline struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
)
2100 static inline int in_gate_area_no_mm(unsigned long addr
) { return 0; }
2101 static inline int in_gate_area(struct mm_struct
*mm
, unsigned long addr
)
2105 #endif /* __HAVE_ARCH_GATE_AREA */
2107 #ifdef CONFIG_SYSCTL
2108 extern int sysctl_drop_caches
;
2109 int drop_caches_sysctl_handler(struct ctl_table
*, int,
2110 void __user
*, size_t *, loff_t
*);
2113 unsigned long shrink_node_slabs(gfp_t gfp_mask
, int nid
,
2114 unsigned long nr_scanned
,
2115 unsigned long nr_eligible
);
2118 #define randomize_va_space 0
2120 extern int randomize_va_space
;
2123 const char * arch_vma_name(struct vm_area_struct
*vma
);
2124 void print_vma_addr(char *prefix
, unsigned long rip
);
2126 void sparse_mem_maps_populate_node(struct page
**map_map
,
2127 unsigned long pnum_begin
,
2128 unsigned long pnum_end
,
2129 unsigned long map_count
,
2132 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
2133 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
2134 pud_t
*vmemmap_pud_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
2135 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
2136 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
2137 void *vmemmap_alloc_block(unsigned long size
, int node
);
2138 void *vmemmap_alloc_block_buf(unsigned long size
, int node
);
2139 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
2140 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
2142 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
);
2143 void vmemmap_populate_print_last(void);
2144 #ifdef CONFIG_MEMORY_HOTPLUG
2145 void vmemmap_free(unsigned long start
, unsigned long end
);
2147 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
2148 unsigned long size
);
2151 MF_COUNT_INCREASED
= 1 << 0,
2152 MF_ACTION_REQUIRED
= 1 << 1,
2153 MF_MUST_KILL
= 1 << 2,
2154 MF_SOFT_OFFLINE
= 1 << 3,
2156 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
2157 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
2158 extern int unpoison_memory(unsigned long pfn
);
2159 extern int sysctl_memory_failure_early_kill
;
2160 extern int sysctl_memory_failure_recovery
;
2161 extern void shake_page(struct page
*p
, int access
);
2162 extern atomic_long_t num_poisoned_pages
;
2163 extern int soft_offline_page(struct page
*page
, int flags
);
2165 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2166 extern void clear_huge_page(struct page
*page
,
2168 unsigned int pages_per_huge_page
);
2169 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
2170 unsigned long addr
, struct vm_area_struct
*vma
,
2171 unsigned int pages_per_huge_page
);
2172 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2174 extern struct page_ext_operations debug_guardpage_ops
;
2175 extern struct page_ext_operations page_poisoning_ops
;
2177 #ifdef CONFIG_DEBUG_PAGEALLOC
2178 extern unsigned int _debug_guardpage_minorder
;
2179 extern bool _debug_guardpage_enabled
;
2181 static inline unsigned int debug_guardpage_minorder(void)
2183 return _debug_guardpage_minorder
;
2186 static inline bool debug_guardpage_enabled(void)
2188 return _debug_guardpage_enabled
;
2191 static inline bool page_is_guard(struct page
*page
)
2193 struct page_ext
*page_ext
;
2195 if (!debug_guardpage_enabled())
2198 page_ext
= lookup_page_ext(page
);
2199 return test_bit(PAGE_EXT_DEBUG_GUARD
, &page_ext
->flags
);
2202 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2203 static inline bool debug_guardpage_enabled(void) { return false; }
2204 static inline bool page_is_guard(struct page
*page
) { return false; }
2205 #endif /* CONFIG_DEBUG_PAGEALLOC */
2207 #if MAX_NUMNODES > 1
2208 void __init
setup_nr_node_ids(void);
2210 static inline void setup_nr_node_ids(void) {}
2213 #endif /* __KERNEL__ */
2214 #endif /* _LINUX_MM_H */