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>
24 struct anon_vma_chain
;
27 struct writeback_control
;
29 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
30 extern unsigned long max_mapnr
;
32 static inline void set_max_mapnr(unsigned long limit
)
37 static inline void set_max_mapnr(unsigned long limit
) { }
40 extern unsigned long totalram_pages
;
41 extern void * high_memory
;
42 extern int page_cluster
;
45 extern int sysctl_legacy_va_layout
;
47 #define sysctl_legacy_va_layout 0
51 #include <asm/pgtable.h>
52 #include <asm/processor.h>
55 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
58 extern unsigned long sysctl_user_reserve_kbytes
;
59 extern unsigned long sysctl_admin_reserve_kbytes
;
61 extern int sysctl_overcommit_memory
;
62 extern int sysctl_overcommit_ratio
;
63 extern unsigned long sysctl_overcommit_kbytes
;
65 extern int overcommit_ratio_handler(struct ctl_table
*, int, void __user
*,
67 extern int overcommit_kbytes_handler(struct ctl_table
*, int, void __user
*,
70 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
72 /* to align the pointer to the (next) page boundary */
73 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
75 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
76 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
79 * Linux kernel virtual memory manager primitives.
80 * The idea being to have a "virtual" mm in the same way
81 * we have a virtual fs - giving a cleaner interface to the
82 * mm details, and allowing different kinds of memory mappings
83 * (from shared memory to executable loading to arbitrary
87 extern struct kmem_cache
*vm_area_cachep
;
90 extern struct rb_root nommu_region_tree
;
91 extern struct rw_semaphore nommu_region_sem
;
93 extern unsigned int kobjsize(const void *objp
);
97 * vm_flags in vm_area_struct, see mm_types.h.
99 #define VM_NONE 0x00000000
101 #define VM_READ 0x00000001 /* currently active flags */
102 #define VM_WRITE 0x00000002
103 #define VM_EXEC 0x00000004
104 #define VM_SHARED 0x00000008
106 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
107 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
108 #define VM_MAYWRITE 0x00000020
109 #define VM_MAYEXEC 0x00000040
110 #define VM_MAYSHARE 0x00000080
112 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
113 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
114 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
116 #define VM_LOCKED 0x00002000
117 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
119 /* Used by sys_madvise() */
120 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
121 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
123 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
124 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
125 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
126 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
127 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
128 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
129 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
130 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
132 #ifdef CONFIG_MEM_SOFT_DIRTY
133 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
135 # define VM_SOFTDIRTY 0
138 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
139 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
140 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
141 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
143 #if defined(CONFIG_X86)
144 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
145 #elif defined(CONFIG_PPC)
146 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
147 #elif defined(CONFIG_PARISC)
148 # define VM_GROWSUP VM_ARCH_1
149 #elif defined(CONFIG_METAG)
150 # define VM_GROWSUP VM_ARCH_1
151 #elif defined(CONFIG_IA64)
152 # define VM_GROWSUP VM_ARCH_1
153 #elif !defined(CONFIG_MMU)
154 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
158 # define VM_GROWSUP VM_NONE
161 /* Bits set in the VMA until the stack is in its final location */
162 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
164 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
165 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
168 #ifdef CONFIG_STACK_GROWSUP
169 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
171 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
175 * Special vmas that are non-mergable, non-mlock()able.
176 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
178 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
180 /* This mask defines which mm->def_flags a process can inherit its parent */
181 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
184 * mapping from the currently active vm_flags protection bits (the
185 * low four bits) to a page protection mask..
187 extern pgprot_t protection_map
[16];
189 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
190 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
191 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
192 #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */
193 #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */
194 #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */
195 #define FAULT_FLAG_TRIED 0x40 /* second try */
196 #define FAULT_FLAG_USER 0x80 /* The fault originated in userspace */
199 * vm_fault is filled by the the pagefault handler and passed to the vma's
200 * ->fault function. The vma's ->fault is responsible for returning a bitmask
201 * of VM_FAULT_xxx flags that give details about how the fault was handled.
203 * pgoff should be used in favour of virtual_address, if possible. If pgoff
204 * is used, one may implement ->remap_pages to get nonlinear mapping support.
207 unsigned int flags
; /* FAULT_FLAG_xxx flags */
208 pgoff_t pgoff
; /* Logical page offset based on vma */
209 void __user
*virtual_address
; /* Faulting virtual address */
211 struct page
*page
; /* ->fault handlers should return a
212 * page here, unless VM_FAULT_NOPAGE
213 * is set (which is also implied by
216 /* for ->map_pages() only */
217 pgoff_t max_pgoff
; /* map pages for offset from pgoff till
218 * max_pgoff inclusive */
219 pte_t
*pte
; /* pte entry associated with ->pgoff */
223 * These are the virtual MM functions - opening of an area, closing and
224 * unmapping it (needed to keep files on disk up-to-date etc), pointer
225 * to the functions called when a no-page or a wp-page exception occurs.
227 struct vm_operations_struct
{
228 void (*open
)(struct vm_area_struct
* area
);
229 void (*close
)(struct vm_area_struct
* area
);
230 int (*fault
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
231 void (*map_pages
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
233 /* notification that a previously read-only page is about to become
234 * writable, if an error is returned it will cause a SIGBUS */
235 int (*page_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
237 /* called by access_process_vm when get_user_pages() fails, typically
238 * for use by special VMAs that can switch between memory and hardware
240 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
241 void *buf
, int len
, int write
);
244 * set_policy() op must add a reference to any non-NULL @new mempolicy
245 * to hold the policy upon return. Caller should pass NULL @new to
246 * remove a policy and fall back to surrounding context--i.e. do not
247 * install a MPOL_DEFAULT policy, nor the task or system default
250 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
253 * get_policy() op must add reference [mpol_get()] to any policy at
254 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
255 * in mm/mempolicy.c will do this automatically.
256 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
257 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
258 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
259 * must return NULL--i.e., do not "fallback" to task or system default
262 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
264 int (*migrate
)(struct vm_area_struct
*vma
, const nodemask_t
*from
,
265 const nodemask_t
*to
, unsigned long flags
);
267 /* called by sys_remap_file_pages() to populate non-linear mapping */
268 int (*remap_pages
)(struct vm_area_struct
*vma
, unsigned long addr
,
269 unsigned long size
, pgoff_t pgoff
);
275 #define page_private(page) ((page)->private)
276 #define set_page_private(page, v) ((page)->private = (v))
278 /* It's valid only if the page is free path or free_list */
279 static inline void set_freepage_migratetype(struct page
*page
, int migratetype
)
281 page
->index
= migratetype
;
284 /* It's valid only if the page is free path or free_list */
285 static inline int get_freepage_migratetype(struct page
*page
)
291 * FIXME: take this include out, include page-flags.h in
292 * files which need it (119 of them)
294 #include <linux/page-flags.h>
295 #include <linux/huge_mm.h>
298 * Methods to modify the page usage count.
300 * What counts for a page usage:
301 * - cache mapping (page->mapping)
302 * - private data (page->private)
303 * - page mapped in a task's page tables, each mapping
304 * is counted separately
306 * Also, many kernel routines increase the page count before a critical
307 * routine so they can be sure the page doesn't go away from under them.
311 * Drop a ref, return true if the refcount fell to zero (the page has no users)
313 static inline int put_page_testzero(struct page
*page
)
315 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) == 0, page
);
316 return atomic_dec_and_test(&page
->_count
);
320 * Try to grab a ref unless the page has a refcount of zero, return false if
322 * This can be called when MMU is off so it must not access
323 * any of the virtual mappings.
325 static inline int get_page_unless_zero(struct page
*page
)
327 return atomic_inc_not_zero(&page
->_count
);
331 * Try to drop a ref unless the page has a refcount of one, return false if
333 * This is to make sure that the refcount won't become zero after this drop.
334 * This can be called when MMU is off so it must not access
335 * any of the virtual mappings.
337 static inline int put_page_unless_one(struct page
*page
)
339 return atomic_add_unless(&page
->_count
, -1, 1);
342 extern int page_is_ram(unsigned long pfn
);
344 /* Support for virtually mapped pages */
345 struct page
*vmalloc_to_page(const void *addr
);
346 unsigned long vmalloc_to_pfn(const void *addr
);
349 * Determine if an address is within the vmalloc range
351 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
352 * is no special casing required.
354 static inline int is_vmalloc_addr(const void *x
)
357 unsigned long addr
= (unsigned long)x
;
359 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
365 extern int is_vmalloc_or_module_addr(const void *x
);
367 static inline int is_vmalloc_or_module_addr(const void *x
)
373 extern void kvfree(const void *addr
);
375 static inline void compound_lock(struct page
*page
)
377 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
378 VM_BUG_ON_PAGE(PageSlab(page
), page
);
379 bit_spin_lock(PG_compound_lock
, &page
->flags
);
383 static inline void compound_unlock(struct page
*page
)
385 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
386 VM_BUG_ON_PAGE(PageSlab(page
), page
);
387 bit_spin_unlock(PG_compound_lock
, &page
->flags
);
391 static inline unsigned long compound_lock_irqsave(struct page
*page
)
393 unsigned long uninitialized_var(flags
);
394 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
395 local_irq_save(flags
);
401 static inline void compound_unlock_irqrestore(struct page
*page
,
404 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
405 compound_unlock(page
);
406 local_irq_restore(flags
);
410 static inline struct page
*compound_head(struct page
*page
)
412 if (unlikely(PageTail(page
))) {
413 struct page
*head
= page
->first_page
;
416 * page->first_page may be a dangling pointer to an old
417 * compound page, so recheck that it is still a tail
418 * page before returning.
421 if (likely(PageTail(page
)))
428 * The atomic page->_mapcount, starts from -1: so that transitions
429 * both from it and to it can be tracked, using atomic_inc_and_test
430 * and atomic_add_negative(-1).
432 static inline void page_mapcount_reset(struct page
*page
)
434 atomic_set(&(page
)->_mapcount
, -1);
437 static inline int page_mapcount(struct page
*page
)
439 return atomic_read(&(page
)->_mapcount
) + 1;
442 static inline int page_count(struct page
*page
)
444 return atomic_read(&compound_head(page
)->_count
);
447 #ifdef CONFIG_HUGETLB_PAGE
448 extern int PageHeadHuge(struct page
*page_head
);
449 #else /* CONFIG_HUGETLB_PAGE */
450 static inline int PageHeadHuge(struct page
*page_head
)
454 #endif /* CONFIG_HUGETLB_PAGE */
456 static inline bool __compound_tail_refcounted(struct page
*page
)
458 return !PageSlab(page
) && !PageHeadHuge(page
);
462 * This takes a head page as parameter and tells if the
463 * tail page reference counting can be skipped.
465 * For this to be safe, PageSlab and PageHeadHuge must remain true on
466 * any given page where they return true here, until all tail pins
467 * have been released.
469 static inline bool compound_tail_refcounted(struct page
*page
)
471 VM_BUG_ON_PAGE(!PageHead(page
), page
);
472 return __compound_tail_refcounted(page
);
475 static inline void get_huge_page_tail(struct page
*page
)
478 * __split_huge_page_refcount() cannot run from under us.
480 VM_BUG_ON_PAGE(!PageTail(page
), page
);
481 VM_BUG_ON_PAGE(page_mapcount(page
) < 0, page
);
482 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) != 0, page
);
483 if (compound_tail_refcounted(page
->first_page
))
484 atomic_inc(&page
->_mapcount
);
487 extern bool __get_page_tail(struct page
*page
);
489 static inline void get_page(struct page
*page
)
491 if (unlikely(PageTail(page
)))
492 if (likely(__get_page_tail(page
)))
495 * Getting a normal page or the head of a compound page
496 * requires to already have an elevated page->_count.
498 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) <= 0, page
);
499 atomic_inc(&page
->_count
);
502 static inline struct page
*virt_to_head_page(const void *x
)
504 struct page
*page
= virt_to_page(x
);
505 return compound_head(page
);
509 * Setup the page count before being freed into the page allocator for
510 * the first time (boot or memory hotplug)
512 static inline void init_page_count(struct page
*page
)
514 atomic_set(&page
->_count
, 1);
518 * PageBuddy() indicate that the page is free and in the buddy system
519 * (see mm/page_alloc.c).
521 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
522 * -2 so that an underflow of the page_mapcount() won't be mistaken
523 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
524 * efficiently by most CPU architectures.
526 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
528 static inline int PageBuddy(struct page
*page
)
530 return atomic_read(&page
->_mapcount
) == PAGE_BUDDY_MAPCOUNT_VALUE
;
533 static inline void __SetPageBuddy(struct page
*page
)
535 VM_BUG_ON_PAGE(atomic_read(&page
->_mapcount
) != -1, page
);
536 atomic_set(&page
->_mapcount
, PAGE_BUDDY_MAPCOUNT_VALUE
);
539 static inline void __ClearPageBuddy(struct page
*page
)
541 VM_BUG_ON_PAGE(!PageBuddy(page
), page
);
542 atomic_set(&page
->_mapcount
, -1);
545 void put_page(struct page
*page
);
546 void put_pages_list(struct list_head
*pages
);
548 void split_page(struct page
*page
, unsigned int order
);
549 int split_free_page(struct page
*page
);
552 * Compound pages have a destructor function. Provide a
553 * prototype for that function and accessor functions.
554 * These are _only_ valid on the head of a PG_compound page.
556 typedef void compound_page_dtor(struct page
*);
558 static inline void set_compound_page_dtor(struct page
*page
,
559 compound_page_dtor
*dtor
)
561 page
[1].lru
.next
= (void *)dtor
;
564 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
566 return (compound_page_dtor
*)page
[1].lru
.next
;
569 static inline int compound_order(struct page
*page
)
573 return (unsigned long)page
[1].lru
.prev
;
576 static inline void set_compound_order(struct page
*page
, unsigned long order
)
578 page
[1].lru
.prev
= (void *)order
;
583 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
584 * servicing faults for write access. In the normal case, do always want
585 * pte_mkwrite. But get_user_pages can cause write faults for mappings
586 * that do not have writing enabled, when used by access_process_vm.
588 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
590 if (likely(vma
->vm_flags
& VM_WRITE
))
591 pte
= pte_mkwrite(pte
);
595 void do_set_pte(struct vm_area_struct
*vma
, unsigned long address
,
596 struct page
*page
, pte_t
*pte
, bool write
, bool anon
);
600 * Multiple processes may "see" the same page. E.g. for untouched
601 * mappings of /dev/null, all processes see the same page full of
602 * zeroes, and text pages of executables and shared libraries have
603 * only one copy in memory, at most, normally.
605 * For the non-reserved pages, page_count(page) denotes a reference count.
606 * page_count() == 0 means the page is free. page->lru is then used for
607 * freelist management in the buddy allocator.
608 * page_count() > 0 means the page has been allocated.
610 * Pages are allocated by the slab allocator in order to provide memory
611 * to kmalloc and kmem_cache_alloc. In this case, the management of the
612 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
613 * unless a particular usage is carefully commented. (the responsibility of
614 * freeing the kmalloc memory is the caller's, of course).
616 * A page may be used by anyone else who does a __get_free_page().
617 * In this case, page_count still tracks the references, and should only
618 * be used through the normal accessor functions. The top bits of page->flags
619 * and page->virtual store page management information, but all other fields
620 * are unused and could be used privately, carefully. The management of this
621 * page is the responsibility of the one who allocated it, and those who have
622 * subsequently been given references to it.
624 * The other pages (we may call them "pagecache pages") are completely
625 * managed by the Linux memory manager: I/O, buffers, swapping etc.
626 * The following discussion applies only to them.
628 * A pagecache page contains an opaque `private' member, which belongs to the
629 * page's address_space. Usually, this is the address of a circular list of
630 * the page's disk buffers. PG_private must be set to tell the VM to call
631 * into the filesystem to release these pages.
633 * A page may belong to an inode's memory mapping. In this case, page->mapping
634 * is the pointer to the inode, and page->index is the file offset of the page,
635 * in units of PAGE_CACHE_SIZE.
637 * If pagecache pages are not associated with an inode, they are said to be
638 * anonymous pages. These may become associated with the swapcache, and in that
639 * case PG_swapcache is set, and page->private is an offset into the swapcache.
641 * In either case (swapcache or inode backed), the pagecache itself holds one
642 * reference to the page. Setting PG_private should also increment the
643 * refcount. The each user mapping also has a reference to the page.
645 * The pagecache pages are stored in a per-mapping radix tree, which is
646 * rooted at mapping->page_tree, and indexed by offset.
647 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
648 * lists, we instead now tag pages as dirty/writeback in the radix tree.
650 * All pagecache pages may be subject to I/O:
651 * - inode pages may need to be read from disk,
652 * - inode pages which have been modified and are MAP_SHARED may need
653 * to be written back to the inode on disk,
654 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
655 * modified may need to be swapped out to swap space and (later) to be read
660 * The zone field is never updated after free_area_init_core()
661 * sets it, so none of the operations on it need to be atomic.
664 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
665 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
666 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
667 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
668 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
671 * Define the bit shifts to access each section. For non-existent
672 * sections we define the shift as 0; that plus a 0 mask ensures
673 * the compiler will optimise away reference to them.
675 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
676 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
677 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
678 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
680 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
681 #ifdef NODE_NOT_IN_PAGE_FLAGS
682 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
683 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
684 SECTIONS_PGOFF : ZONES_PGOFF)
686 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
687 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
688 NODES_PGOFF : ZONES_PGOFF)
691 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
693 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
694 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
697 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
698 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
699 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
700 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
701 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
703 static inline enum zone_type
page_zonenum(const struct page
*page
)
705 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
708 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
709 #define SECTION_IN_PAGE_FLAGS
713 * The identification function is mainly used by the buddy allocator for
714 * determining if two pages could be buddies. We are not really identifying
715 * the zone since we could be using the section number id if we do not have
716 * node id available in page flags.
717 * We only guarantee that it will return the same value for two combinable
720 static inline int page_zone_id(struct page
*page
)
722 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
725 static inline int zone_to_nid(struct zone
*zone
)
734 #ifdef NODE_NOT_IN_PAGE_FLAGS
735 extern int page_to_nid(const struct page
*page
);
737 static inline int page_to_nid(const struct page
*page
)
739 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
743 #ifdef CONFIG_NUMA_BALANCING
744 static inline int cpu_pid_to_cpupid(int cpu
, int pid
)
746 return ((cpu
& LAST__CPU_MASK
) << LAST__PID_SHIFT
) | (pid
& LAST__PID_MASK
);
749 static inline int cpupid_to_pid(int cpupid
)
751 return cpupid
& LAST__PID_MASK
;
754 static inline int cpupid_to_cpu(int cpupid
)
756 return (cpupid
>> LAST__PID_SHIFT
) & LAST__CPU_MASK
;
759 static inline int cpupid_to_nid(int cpupid
)
761 return cpu_to_node(cpupid_to_cpu(cpupid
));
764 static inline bool cpupid_pid_unset(int cpupid
)
766 return cpupid_to_pid(cpupid
) == (-1 & LAST__PID_MASK
);
769 static inline bool cpupid_cpu_unset(int cpupid
)
771 return cpupid_to_cpu(cpupid
) == (-1 & LAST__CPU_MASK
);
774 static inline bool __cpupid_match_pid(pid_t task_pid
, int cpupid
)
776 return (task_pid
& LAST__PID_MASK
) == cpupid_to_pid(cpupid
);
779 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
780 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
781 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
783 return xchg(&page
->_last_cpupid
, cpupid
& LAST_CPUPID_MASK
);
786 static inline int page_cpupid_last(struct page
*page
)
788 return page
->_last_cpupid
;
790 static inline void page_cpupid_reset_last(struct page
*page
)
792 page
->_last_cpupid
= -1 & LAST_CPUPID_MASK
;
795 static inline int page_cpupid_last(struct page
*page
)
797 return (page
->flags
>> LAST_CPUPID_PGSHIFT
) & LAST_CPUPID_MASK
;
800 extern int page_cpupid_xchg_last(struct page
*page
, int cpupid
);
802 static inline void page_cpupid_reset_last(struct page
*page
)
804 int cpupid
= (1 << LAST_CPUPID_SHIFT
) - 1;
806 page
->flags
&= ~(LAST_CPUPID_MASK
<< LAST_CPUPID_PGSHIFT
);
807 page
->flags
|= (cpupid
& LAST_CPUPID_MASK
) << LAST_CPUPID_PGSHIFT
;
809 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
810 #else /* !CONFIG_NUMA_BALANCING */
811 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
813 return page_to_nid(page
); /* XXX */
816 static inline int page_cpupid_last(struct page
*page
)
818 return page_to_nid(page
); /* XXX */
821 static inline int cpupid_to_nid(int cpupid
)
826 static inline int cpupid_to_pid(int cpupid
)
831 static inline int cpupid_to_cpu(int cpupid
)
836 static inline int cpu_pid_to_cpupid(int nid
, int pid
)
841 static inline bool cpupid_pid_unset(int cpupid
)
846 static inline void page_cpupid_reset_last(struct page
*page
)
850 static inline bool cpupid_match_pid(struct task_struct
*task
, int cpupid
)
854 #endif /* CONFIG_NUMA_BALANCING */
856 static inline struct zone
*page_zone(const struct page
*page
)
858 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
861 #ifdef SECTION_IN_PAGE_FLAGS
862 static inline void set_page_section(struct page
*page
, unsigned long section
)
864 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
865 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
868 static inline unsigned long page_to_section(const struct page
*page
)
870 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
874 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
876 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
877 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
880 static inline void set_page_node(struct page
*page
, unsigned long node
)
882 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
883 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
886 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
887 unsigned long node
, unsigned long pfn
)
889 set_page_zone(page
, zone
);
890 set_page_node(page
, node
);
891 #ifdef SECTION_IN_PAGE_FLAGS
892 set_page_section(page
, pfn_to_section_nr(pfn
));
897 * Some inline functions in vmstat.h depend on page_zone()
899 #include <linux/vmstat.h>
901 static __always_inline
void *lowmem_page_address(const struct page
*page
)
903 return __va(PFN_PHYS(page_to_pfn(page
)));
906 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
907 #define HASHED_PAGE_VIRTUAL
910 #if defined(WANT_PAGE_VIRTUAL)
911 static inline void *page_address(const struct page
*page
)
913 return page
->virtual;
915 static inline void set_page_address(struct page
*page
, void *address
)
917 page
->virtual = address
;
919 #define page_address_init() do { } while(0)
922 #if defined(HASHED_PAGE_VIRTUAL)
923 void *page_address(const struct page
*page
);
924 void set_page_address(struct page
*page
, void *virtual);
925 void page_address_init(void);
928 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
929 #define page_address(page) lowmem_page_address(page)
930 #define set_page_address(page, address) do { } while(0)
931 #define page_address_init() do { } while(0)
935 * On an anonymous page mapped into a user virtual memory area,
936 * page->mapping points to its anon_vma, not to a struct address_space;
937 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
939 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
940 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
941 * and then page->mapping points, not to an anon_vma, but to a private
942 * structure which KSM associates with that merged page. See ksm.h.
944 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
946 * Please note that, confusingly, "page_mapping" refers to the inode
947 * address_space which maps the page from disk; whereas "page_mapped"
948 * refers to user virtual address space into which the page is mapped.
950 #define PAGE_MAPPING_ANON 1
951 #define PAGE_MAPPING_KSM 2
952 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
954 extern struct address_space
*page_mapping(struct page
*page
);
956 /* Neutral page->mapping pointer to address_space or anon_vma or other */
957 static inline void *page_rmapping(struct page
*page
)
959 return (void *)((unsigned long)page
->mapping
& ~PAGE_MAPPING_FLAGS
);
962 extern struct address_space
*__page_file_mapping(struct page
*);
965 struct address_space
*page_file_mapping(struct page
*page
)
967 if (unlikely(PageSwapCache(page
)))
968 return __page_file_mapping(page
);
970 return page
->mapping
;
973 static inline int PageAnon(struct page
*page
)
975 return ((unsigned long)page
->mapping
& PAGE_MAPPING_ANON
) != 0;
979 * Return the pagecache index of the passed page. Regular pagecache pages
980 * use ->index whereas swapcache pages use ->private
982 static inline pgoff_t
page_index(struct page
*page
)
984 if (unlikely(PageSwapCache(page
)))
985 return page_private(page
);
989 extern pgoff_t
__page_file_index(struct page
*page
);
992 * Return the file index of the page. Regular pagecache pages use ->index
993 * whereas swapcache pages use swp_offset(->private)
995 static inline pgoff_t
page_file_index(struct page
*page
)
997 if (unlikely(PageSwapCache(page
)))
998 return __page_file_index(page
);
1004 * Return true if this page is mapped into pagetables.
1006 static inline int page_mapped(struct page
*page
)
1008 return atomic_read(&(page
)->_mapcount
) >= 0;
1012 * Different kinds of faults, as returned by handle_mm_fault().
1013 * Used to decide whether a process gets delivered SIGBUS or
1014 * just gets major/minor fault counters bumped up.
1017 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1019 #define VM_FAULT_OOM 0x0001
1020 #define VM_FAULT_SIGBUS 0x0002
1021 #define VM_FAULT_MAJOR 0x0004
1022 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1023 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1024 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1026 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1027 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1028 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1029 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1031 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1033 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
1034 VM_FAULT_FALLBACK | VM_FAULT_HWPOISON_LARGE)
1036 /* Encode hstate index for a hwpoisoned large page */
1037 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1038 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1041 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1043 extern void pagefault_out_of_memory(void);
1045 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1048 * Flags passed to show_mem() and show_free_areas() to suppress output in
1051 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1053 extern void show_free_areas(unsigned int flags
);
1054 extern bool skip_free_areas_node(unsigned int flags
, int nid
);
1056 int shmem_zero_setup(struct vm_area_struct
*);
1058 bool shmem_mapping(struct address_space
*mapping
);
1060 static inline bool shmem_mapping(struct address_space
*mapping
)
1066 extern int can_do_mlock(void);
1067 extern int user_shm_lock(size_t, struct user_struct
*);
1068 extern void user_shm_unlock(size_t, struct user_struct
*);
1071 * Parameter block passed down to zap_pte_range in exceptional cases.
1073 struct zap_details
{
1074 struct vm_area_struct
*nonlinear_vma
; /* Check page->index if set */
1075 struct address_space
*check_mapping
; /* Check page->mapping if set */
1076 pgoff_t first_index
; /* Lowest page->index to unmap */
1077 pgoff_t last_index
; /* Highest page->index to unmap */
1080 struct page
*vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
1083 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
1084 unsigned long size
);
1085 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
1086 unsigned long size
, struct zap_details
*);
1087 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
1088 unsigned long start
, unsigned long end
);
1091 * mm_walk - callbacks for walk_page_range
1092 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
1093 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1094 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1095 * this handler is required to be able to handle
1096 * pmd_trans_huge() pmds. They may simply choose to
1097 * split_huge_page() instead of handling it explicitly.
1098 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1099 * @pte_hole: if set, called for each hole at all levels
1100 * @hugetlb_entry: if set, called for each hugetlb entry
1101 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
1104 * (see walk_page_range for more details)
1107 int (*pgd_entry
)(pgd_t
*pgd
, unsigned long addr
,
1108 unsigned long next
, struct mm_walk
*walk
);
1109 int (*pud_entry
)(pud_t
*pud
, unsigned long addr
,
1110 unsigned long next
, struct mm_walk
*walk
);
1111 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
1112 unsigned long next
, struct mm_walk
*walk
);
1113 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
1114 unsigned long next
, struct mm_walk
*walk
);
1115 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
1116 struct mm_walk
*walk
);
1117 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
1118 unsigned long addr
, unsigned long next
,
1119 struct mm_walk
*walk
);
1120 struct mm_struct
*mm
;
1124 int walk_page_range(unsigned long addr
, unsigned long end
,
1125 struct mm_walk
*walk
);
1126 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1127 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1128 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1129 struct vm_area_struct
*vma
);
1130 void unmap_mapping_range(struct address_space
*mapping
,
1131 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1132 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1133 unsigned long *pfn
);
1134 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1135 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1136 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1137 void *buf
, int len
, int write
);
1139 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1140 loff_t
const holebegin
, loff_t
const holelen
)
1142 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1145 extern void truncate_pagecache(struct inode
*inode
, loff_t
new);
1146 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1147 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1148 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1149 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1150 int invalidate_inode_page(struct page
*page
);
1153 extern int handle_mm_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1154 unsigned long address
, unsigned int flags
);
1155 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1156 unsigned long address
, unsigned int fault_flags
);
1158 static inline int handle_mm_fault(struct mm_struct
*mm
,
1159 struct vm_area_struct
*vma
, unsigned long address
,
1162 /* should never happen if there's no MMU */
1164 return VM_FAULT_SIGBUS
;
1166 static inline int fixup_user_fault(struct task_struct
*tsk
,
1167 struct mm_struct
*mm
, unsigned long address
,
1168 unsigned int fault_flags
)
1170 /* should never happen if there's no MMU */
1176 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
1177 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1178 void *buf
, int len
, int write
);
1180 long __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1181 unsigned long start
, unsigned long nr_pages
,
1182 unsigned int foll_flags
, struct page
**pages
,
1183 struct vm_area_struct
**vmas
, int *nonblocking
);
1184 long get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1185 unsigned long start
, unsigned long nr_pages
,
1186 int write
, int force
, struct page
**pages
,
1187 struct vm_area_struct
**vmas
);
1188 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1189 struct page
**pages
);
1191 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1192 struct page
**pages
);
1193 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1194 struct page
*get_dump_page(unsigned long addr
);
1196 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1197 extern void do_invalidatepage(struct page
*page
, unsigned int offset
,
1198 unsigned int length
);
1200 int __set_page_dirty_nobuffers(struct page
*page
);
1201 int __set_page_dirty_no_writeback(struct page
*page
);
1202 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1204 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1205 void account_page_writeback(struct page
*page
);
1206 int set_page_dirty(struct page
*page
);
1207 int set_page_dirty_lock(struct page
*page
);
1208 int clear_page_dirty_for_io(struct page
*page
);
1209 int get_cmdline(struct task_struct
*task
, char *buffer
, int buflen
);
1211 /* Is the vma a continuation of the stack vma above it? */
1212 static inline int vma_growsdown(struct vm_area_struct
*vma
, unsigned long addr
)
1214 return vma
&& (vma
->vm_end
== addr
) && (vma
->vm_flags
& VM_GROWSDOWN
);
1217 static inline int stack_guard_page_start(struct vm_area_struct
*vma
,
1220 return (vma
->vm_flags
& VM_GROWSDOWN
) &&
1221 (vma
->vm_start
== addr
) &&
1222 !vma_growsdown(vma
->vm_prev
, addr
);
1225 /* Is the vma a continuation of the stack vma below it? */
1226 static inline int vma_growsup(struct vm_area_struct
*vma
, unsigned long addr
)
1228 return vma
&& (vma
->vm_start
== addr
) && (vma
->vm_flags
& VM_GROWSUP
);
1231 static inline int stack_guard_page_end(struct vm_area_struct
*vma
,
1234 return (vma
->vm_flags
& VM_GROWSUP
) &&
1235 (vma
->vm_end
== addr
) &&
1236 !vma_growsup(vma
->vm_next
, addr
);
1240 vm_is_stack(struct task_struct
*task
, struct vm_area_struct
*vma
, int in_group
);
1242 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1243 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1244 unsigned long new_addr
, unsigned long len
,
1245 bool need_rmap_locks
);
1246 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1247 unsigned long end
, pgprot_t newprot
,
1248 int dirty_accountable
, int prot_numa
);
1249 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1250 struct vm_area_struct
**pprev
, unsigned long start
,
1251 unsigned long end
, unsigned long newflags
);
1254 * doesn't attempt to fault and will return short.
1256 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1257 struct page
**pages
);
1259 * per-process(per-mm_struct) statistics.
1261 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1263 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1265 #ifdef SPLIT_RSS_COUNTING
1267 * counter is updated in asynchronous manner and may go to minus.
1268 * But it's never be expected number for users.
1273 return (unsigned long)val
;
1276 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1278 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1281 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1283 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1286 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1288 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1291 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1293 return get_mm_counter(mm
, MM_FILEPAGES
) +
1294 get_mm_counter(mm
, MM_ANONPAGES
);
1297 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1299 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1302 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1304 return max(mm
->hiwater_vm
, mm
->total_vm
);
1307 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1309 unsigned long _rss
= get_mm_rss(mm
);
1311 if ((mm
)->hiwater_rss
< _rss
)
1312 (mm
)->hiwater_rss
= _rss
;
1315 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1317 if (mm
->hiwater_vm
< mm
->total_vm
)
1318 mm
->hiwater_vm
= mm
->total_vm
;
1321 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1322 struct mm_struct
*mm
)
1324 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1326 if (*maxrss
< hiwater_rss
)
1327 *maxrss
= hiwater_rss
;
1330 #if defined(SPLIT_RSS_COUNTING)
1331 void sync_mm_rss(struct mm_struct
*mm
);
1333 static inline void sync_mm_rss(struct mm_struct
*mm
)
1338 int vma_wants_writenotify(struct vm_area_struct
*vma
);
1340 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1342 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1346 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1350 #ifdef __PAGETABLE_PUD_FOLDED
1351 static inline int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1352 unsigned long address
)
1357 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1360 #ifdef __PAGETABLE_PMD_FOLDED
1361 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1362 unsigned long address
)
1367 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1370 int __pte_alloc(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1371 pmd_t
*pmd
, unsigned long address
);
1372 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1375 * The following ifdef needed to get the 4level-fixup.h header to work.
1376 * Remove it when 4level-fixup.h has been removed.
1378 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1379 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
1381 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
1382 NULL
: pud_offset(pgd
, address
);
1385 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1387 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1388 NULL
: pmd_offset(pud
, address
);
1390 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1392 #if USE_SPLIT_PTE_PTLOCKS
1393 #if ALLOC_SPLIT_PTLOCKS
1394 void __init
ptlock_cache_init(void);
1395 extern bool ptlock_alloc(struct page
*page
);
1396 extern void ptlock_free(struct page
*page
);
1398 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1402 #else /* ALLOC_SPLIT_PTLOCKS */
1403 static inline void ptlock_cache_init(void)
1407 static inline bool ptlock_alloc(struct page
*page
)
1412 static inline void ptlock_free(struct page
*page
)
1416 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1420 #endif /* ALLOC_SPLIT_PTLOCKS */
1422 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1424 return ptlock_ptr(pmd_page(*pmd
));
1427 static inline bool ptlock_init(struct page
*page
)
1430 * prep_new_page() initialize page->private (and therefore page->ptl)
1431 * with 0. Make sure nobody took it in use in between.
1433 * It can happen if arch try to use slab for page table allocation:
1434 * slab code uses page->slab_cache and page->first_page (for tail
1435 * pages), which share storage with page->ptl.
1437 VM_BUG_ON_PAGE(*(unsigned long *)&page
->ptl
, page
);
1438 if (!ptlock_alloc(page
))
1440 spin_lock_init(ptlock_ptr(page
));
1444 /* Reset page->mapping so free_pages_check won't complain. */
1445 static inline void pte_lock_deinit(struct page
*page
)
1447 page
->mapping
= NULL
;
1451 #else /* !USE_SPLIT_PTE_PTLOCKS */
1453 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1455 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1457 return &mm
->page_table_lock
;
1459 static inline void ptlock_cache_init(void) {}
1460 static inline bool ptlock_init(struct page
*page
) { return true; }
1461 static inline void pte_lock_deinit(struct page
*page
) {}
1462 #endif /* USE_SPLIT_PTE_PTLOCKS */
1464 static inline void pgtable_init(void)
1466 ptlock_cache_init();
1467 pgtable_cache_init();
1470 static inline bool pgtable_page_ctor(struct page
*page
)
1472 inc_zone_page_state(page
, NR_PAGETABLE
);
1473 return ptlock_init(page
);
1476 static inline void pgtable_page_dtor(struct page
*page
)
1478 pte_lock_deinit(page
);
1479 dec_zone_page_state(page
, NR_PAGETABLE
);
1482 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1484 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1485 pte_t *__pte = pte_offset_map(pmd, address); \
1491 #define pte_unmap_unlock(pte, ptl) do { \
1496 #define pte_alloc_map(mm, vma, pmd, address) \
1497 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1499 NULL: pte_offset_map(pmd, address))
1501 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1502 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1504 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1506 #define pte_alloc_kernel(pmd, address) \
1507 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1508 NULL: pte_offset_kernel(pmd, address))
1510 #if USE_SPLIT_PMD_PTLOCKS
1512 static struct page
*pmd_to_page(pmd_t
*pmd
)
1514 unsigned long mask
= ~(PTRS_PER_PMD
* sizeof(pmd_t
) - 1);
1515 return virt_to_page((void *)((unsigned long) pmd
& mask
));
1518 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1520 return ptlock_ptr(pmd_to_page(pmd
));
1523 static inline bool pgtable_pmd_page_ctor(struct page
*page
)
1525 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1526 page
->pmd_huge_pte
= NULL
;
1528 return ptlock_init(page
);
1531 static inline void pgtable_pmd_page_dtor(struct page
*page
)
1533 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1534 VM_BUG_ON_PAGE(page
->pmd_huge_pte
, page
);
1539 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1543 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1545 return &mm
->page_table_lock
;
1548 static inline bool pgtable_pmd_page_ctor(struct page
*page
) { return true; }
1549 static inline void pgtable_pmd_page_dtor(struct page
*page
) {}
1551 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1555 static inline spinlock_t
*pmd_lock(struct mm_struct
*mm
, pmd_t
*pmd
)
1557 spinlock_t
*ptl
= pmd_lockptr(mm
, pmd
);
1562 extern void free_area_init(unsigned long * zones_size
);
1563 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1564 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1565 extern void free_initmem(void);
1568 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1569 * into the buddy system. The freed pages will be poisoned with pattern
1570 * "poison" if it's within range [0, UCHAR_MAX].
1571 * Return pages freed into the buddy system.
1573 extern unsigned long free_reserved_area(void *start
, void *end
,
1574 int poison
, char *s
);
1576 #ifdef CONFIG_HIGHMEM
1578 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1579 * and totalram_pages.
1581 extern void free_highmem_page(struct page
*page
);
1584 extern void adjust_managed_page_count(struct page
*page
, long count
);
1585 extern void mem_init_print_info(const char *str
);
1587 /* Free the reserved page into the buddy system, so it gets managed. */
1588 static inline void __free_reserved_page(struct page
*page
)
1590 ClearPageReserved(page
);
1591 init_page_count(page
);
1595 static inline void free_reserved_page(struct page
*page
)
1597 __free_reserved_page(page
);
1598 adjust_managed_page_count(page
, 1);
1601 static inline void mark_page_reserved(struct page
*page
)
1603 SetPageReserved(page
);
1604 adjust_managed_page_count(page
, -1);
1608 * Default method to free all the __init memory into the buddy system.
1609 * The freed pages will be poisoned with pattern "poison" if it's within
1610 * range [0, UCHAR_MAX].
1611 * Return pages freed into the buddy system.
1613 static inline unsigned long free_initmem_default(int poison
)
1615 extern char __init_begin
[], __init_end
[];
1617 return free_reserved_area(&__init_begin
, &__init_end
,
1618 poison
, "unused kernel");
1621 static inline unsigned long get_num_physpages(void)
1624 unsigned long phys_pages
= 0;
1626 for_each_online_node(nid
)
1627 phys_pages
+= node_present_pages(nid
);
1632 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1634 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1635 * zones, allocate the backing mem_map and account for memory holes in a more
1636 * architecture independent manner. This is a substitute for creating the
1637 * zone_sizes[] and zholes_size[] arrays and passing them to
1638 * free_area_init_node()
1640 * An architecture is expected to register range of page frames backed by
1641 * physical memory with memblock_add[_node]() before calling
1642 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1643 * usage, an architecture is expected to do something like
1645 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1647 * for_each_valid_physical_page_range()
1648 * memblock_add_node(base, size, nid)
1649 * free_area_init_nodes(max_zone_pfns);
1651 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1652 * registered physical page range. Similarly
1653 * sparse_memory_present_with_active_regions() calls memory_present() for
1654 * each range when SPARSEMEM is enabled.
1656 * See mm/page_alloc.c for more information on each function exposed by
1657 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1659 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1660 unsigned long node_map_pfn_alignment(void);
1661 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1662 unsigned long end_pfn
);
1663 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1664 unsigned long end_pfn
);
1665 extern void get_pfn_range_for_nid(unsigned int nid
,
1666 unsigned long *start_pfn
, unsigned long *end_pfn
);
1667 extern unsigned long find_min_pfn_with_active_regions(void);
1668 extern void free_bootmem_with_active_regions(int nid
,
1669 unsigned long max_low_pfn
);
1670 extern void sparse_memory_present_with_active_regions(int nid
);
1672 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1674 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1675 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1676 static inline int __early_pfn_to_nid(unsigned long pfn
)
1681 /* please see mm/page_alloc.c */
1682 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1683 /* there is a per-arch backend function. */
1684 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
);
1687 extern void set_dma_reserve(unsigned long new_dma_reserve
);
1688 extern void memmap_init_zone(unsigned long, int, unsigned long,
1689 unsigned long, enum memmap_context
);
1690 extern void setup_per_zone_wmarks(void);
1691 extern int __meminit
init_per_zone_wmark_min(void);
1692 extern void mem_init(void);
1693 extern void __init
mmap_init(void);
1694 extern void show_mem(unsigned int flags
);
1695 extern void si_meminfo(struct sysinfo
* val
);
1696 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
1698 extern __printf(3, 4)
1699 void warn_alloc_failed(gfp_t gfp_mask
, int order
, const char *fmt
, ...);
1701 extern void setup_per_cpu_pageset(void);
1703 extern void zone_pcp_update(struct zone
*zone
);
1704 extern void zone_pcp_reset(struct zone
*zone
);
1707 extern int min_free_kbytes
;
1710 extern atomic_long_t mmap_pages_allocated
;
1711 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
1713 /* interval_tree.c */
1714 void vma_interval_tree_insert(struct vm_area_struct
*node
,
1715 struct rb_root
*root
);
1716 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
1717 struct vm_area_struct
*prev
,
1718 struct rb_root
*root
);
1719 void vma_interval_tree_remove(struct vm_area_struct
*node
,
1720 struct rb_root
*root
);
1721 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root
*root
,
1722 unsigned long start
, unsigned long last
);
1723 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
1724 unsigned long start
, unsigned long last
);
1726 #define vma_interval_tree_foreach(vma, root, start, last) \
1727 for (vma = vma_interval_tree_iter_first(root, start, last); \
1728 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1730 static inline void vma_nonlinear_insert(struct vm_area_struct
*vma
,
1731 struct list_head
*list
)
1733 list_add_tail(&vma
->shared
.nonlinear
, list
);
1736 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
1737 struct rb_root
*root
);
1738 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
1739 struct rb_root
*root
);
1740 struct anon_vma_chain
*anon_vma_interval_tree_iter_first(
1741 struct rb_root
*root
, unsigned long start
, unsigned long last
);
1742 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
1743 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
1744 #ifdef CONFIG_DEBUG_VM_RB
1745 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
1748 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1749 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1750 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1753 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
1754 extern int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
1755 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
1756 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
1757 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
1758 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
1759 struct mempolicy
*);
1760 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
1761 extern int split_vma(struct mm_struct
*,
1762 struct vm_area_struct
*, unsigned long addr
, int new_below
);
1763 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
1764 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
1765 struct rb_node
**, struct rb_node
*);
1766 extern void unlink_file_vma(struct vm_area_struct
*);
1767 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
1768 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
1769 bool *need_rmap_locks
);
1770 extern void exit_mmap(struct mm_struct
*);
1772 extern int mm_take_all_locks(struct mm_struct
*mm
);
1773 extern void mm_drop_all_locks(struct mm_struct
*mm
);
1775 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
1776 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
1778 extern int may_expand_vm(struct mm_struct
*mm
, unsigned long npages
);
1779 extern struct vm_area_struct
*_install_special_mapping(struct mm_struct
*mm
,
1780 unsigned long addr
, unsigned long len
,
1781 unsigned long flags
, struct page
**pages
);
1782 extern int install_special_mapping(struct mm_struct
*mm
,
1783 unsigned long addr
, unsigned long len
,
1784 unsigned long flags
, struct page
**pages
);
1786 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1788 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
1789 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
);
1790 extern unsigned long do_mmap_pgoff(struct file
*file
, unsigned long addr
,
1791 unsigned long len
, unsigned long prot
, unsigned long flags
,
1792 unsigned long pgoff
, unsigned long *populate
);
1793 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
1796 extern int __mm_populate(unsigned long addr
, unsigned long len
,
1798 static inline void mm_populate(unsigned long addr
, unsigned long len
)
1801 (void) __mm_populate(addr
, len
, 1);
1804 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
1807 /* These take the mm semaphore themselves */
1808 extern unsigned long vm_brk(unsigned long, unsigned long);
1809 extern int vm_munmap(unsigned long, size_t);
1810 extern unsigned long vm_mmap(struct file
*, unsigned long,
1811 unsigned long, unsigned long,
1812 unsigned long, unsigned long);
1814 struct vm_unmapped_area_info
{
1815 #define VM_UNMAPPED_AREA_TOPDOWN 1
1816 unsigned long flags
;
1817 unsigned long length
;
1818 unsigned long low_limit
;
1819 unsigned long high_limit
;
1820 unsigned long align_mask
;
1821 unsigned long align_offset
;
1824 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
1825 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
1828 * Search for an unmapped address range.
1830 * We are looking for a range that:
1831 * - does not intersect with any VMA;
1832 * - is contained within the [low_limit, high_limit) interval;
1833 * - is at least the desired size.
1834 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1836 static inline unsigned long
1837 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
1839 if (!(info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
))
1840 return unmapped_area(info
);
1842 return unmapped_area_topdown(info
);
1846 extern void truncate_inode_pages(struct address_space
*, loff_t
);
1847 extern void truncate_inode_pages_range(struct address_space
*,
1848 loff_t lstart
, loff_t lend
);
1849 extern void truncate_inode_pages_final(struct address_space
*);
1851 /* generic vm_area_ops exported for stackable file systems */
1852 extern int filemap_fault(struct vm_area_struct
*, struct vm_fault
*);
1853 extern void filemap_map_pages(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1854 extern int filemap_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1856 /* mm/page-writeback.c */
1857 int write_one_page(struct page
*page
, int wait
);
1858 void task_dirty_inc(struct task_struct
*tsk
);
1861 #define VM_MAX_READAHEAD 128 /* kbytes */
1862 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1864 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
1865 pgoff_t offset
, unsigned long nr_to_read
);
1867 void page_cache_sync_readahead(struct address_space
*mapping
,
1868 struct file_ra_state
*ra
,
1871 unsigned long size
);
1873 void page_cache_async_readahead(struct address_space
*mapping
,
1874 struct file_ra_state
*ra
,
1878 unsigned long size
);
1880 unsigned long max_sane_readahead(unsigned long nr
);
1882 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1883 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
1885 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1886 extern int expand_downwards(struct vm_area_struct
*vma
,
1887 unsigned long address
);
1889 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
1891 #define expand_upwards(vma, address) do { } while (0)
1894 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1895 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
1896 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
1897 struct vm_area_struct
**pprev
);
1899 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1900 NULL if none. Assume start_addr < end_addr. */
1901 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
1903 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
1905 if (vma
&& end_addr
<= vma
->vm_start
)
1910 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
1912 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
1915 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1916 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
1917 unsigned long vm_start
, unsigned long vm_end
)
1919 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
1921 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
1928 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
1930 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
1936 #ifdef CONFIG_NUMA_BALANCING
1937 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
1938 unsigned long start
, unsigned long end
);
1941 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
1942 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
1943 unsigned long pfn
, unsigned long size
, pgprot_t
);
1944 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
1945 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
1947 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
1949 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
1952 struct page
*follow_page_mask(struct vm_area_struct
*vma
,
1953 unsigned long address
, unsigned int foll_flags
,
1954 unsigned int *page_mask
);
1956 static inline struct page
*follow_page(struct vm_area_struct
*vma
,
1957 unsigned long address
, unsigned int foll_flags
)
1959 unsigned int unused_page_mask
;
1960 return follow_page_mask(vma
, address
, foll_flags
, &unused_page_mask
);
1963 #define FOLL_WRITE 0x01 /* check pte is writable */
1964 #define FOLL_TOUCH 0x02 /* mark page accessed */
1965 #define FOLL_GET 0x04 /* do get_page on page */
1966 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1967 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1968 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
1969 * and return without waiting upon it */
1970 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
1971 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
1972 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
1973 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
1974 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
1976 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
1978 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
1979 unsigned long size
, pte_fn_t fn
, void *data
);
1981 #ifdef CONFIG_PROC_FS
1982 void vm_stat_account(struct mm_struct
*, unsigned long, struct file
*, long);
1984 static inline void vm_stat_account(struct mm_struct
*mm
,
1985 unsigned long flags
, struct file
*file
, long pages
)
1987 mm
->total_vm
+= pages
;
1989 #endif /* CONFIG_PROC_FS */
1991 #ifdef CONFIG_DEBUG_PAGEALLOC
1992 extern void kernel_map_pages(struct page
*page
, int numpages
, int enable
);
1993 #ifdef CONFIG_HIBERNATION
1994 extern bool kernel_page_present(struct page
*page
);
1995 #endif /* CONFIG_HIBERNATION */
1998 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
1999 #ifdef CONFIG_HIBERNATION
2000 static inline bool kernel_page_present(struct page
*page
) { return true; }
2001 #endif /* CONFIG_HIBERNATION */
2004 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
2005 #ifdef __HAVE_ARCH_GATE_AREA
2006 int in_gate_area_no_mm(unsigned long addr
);
2007 int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
2009 int in_gate_area_no_mm(unsigned long addr
);
2010 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
2011 #endif /* __HAVE_ARCH_GATE_AREA */
2013 #ifdef CONFIG_SYSCTL
2014 extern int sysctl_drop_caches
;
2015 int drop_caches_sysctl_handler(struct ctl_table
*, int,
2016 void __user
*, size_t *, loff_t
*);
2019 unsigned long shrink_slab(struct shrink_control
*shrink
,
2020 unsigned long nr_pages_scanned
,
2021 unsigned long lru_pages
);
2024 #define randomize_va_space 0
2026 extern int randomize_va_space
;
2029 const char * arch_vma_name(struct vm_area_struct
*vma
);
2030 void print_vma_addr(char *prefix
, unsigned long rip
);
2032 void sparse_mem_maps_populate_node(struct page
**map_map
,
2033 unsigned long pnum_begin
,
2034 unsigned long pnum_end
,
2035 unsigned long map_count
,
2038 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
2039 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
2040 pud_t
*vmemmap_pud_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
2041 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
2042 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
2043 void *vmemmap_alloc_block(unsigned long size
, int node
);
2044 void *vmemmap_alloc_block_buf(unsigned long size
, int node
);
2045 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
2046 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
2048 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
);
2049 void vmemmap_populate_print_last(void);
2050 #ifdef CONFIG_MEMORY_HOTPLUG
2051 void vmemmap_free(unsigned long start
, unsigned long end
);
2053 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
2054 unsigned long size
);
2057 MF_COUNT_INCREASED
= 1 << 0,
2058 MF_ACTION_REQUIRED
= 1 << 1,
2059 MF_MUST_KILL
= 1 << 2,
2060 MF_SOFT_OFFLINE
= 1 << 3,
2062 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
2063 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
2064 extern int unpoison_memory(unsigned long pfn
);
2065 extern int sysctl_memory_failure_early_kill
;
2066 extern int sysctl_memory_failure_recovery
;
2067 extern void shake_page(struct page
*p
, int access
);
2068 extern atomic_long_t num_poisoned_pages
;
2069 extern int soft_offline_page(struct page
*page
, int flags
);
2071 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2072 extern void clear_huge_page(struct page
*page
,
2074 unsigned int pages_per_huge_page
);
2075 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
2076 unsigned long addr
, struct vm_area_struct
*vma
,
2077 unsigned int pages_per_huge_page
);
2078 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2080 #ifdef CONFIG_DEBUG_PAGEALLOC
2081 extern unsigned int _debug_guardpage_minorder
;
2083 static inline unsigned int debug_guardpage_minorder(void)
2085 return _debug_guardpage_minorder
;
2088 static inline bool page_is_guard(struct page
*page
)
2090 return test_bit(PAGE_DEBUG_FLAG_GUARD
, &page
->debug_flags
);
2093 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2094 static inline bool page_is_guard(struct page
*page
) { return false; }
2095 #endif /* CONFIG_DEBUG_PAGEALLOC */
2097 #if MAX_NUMNODES > 1
2098 void __init
setup_nr_node_ids(void);
2100 static inline void setup_nr_node_ids(void) {}
2103 #endif /* __KERNEL__ */
2104 #endif /* _LINUX_MM_H */