4 #include <linux/errno.h>
10 #include <linux/list.h>
11 #include <linux/mmzone.h>
12 #include <linux/rbtree.h>
13 #include <linux/atomic.h>
14 #include <linux/debug_locks.h>
15 #include <linux/mm_types.h>
16 #include <linux/range.h>
17 #include <linux/pfn.h>
18 #include <linux/bit_spinlock.h>
19 #include <linux/shrinker.h>
23 struct anon_vma_chain
;
26 struct writeback_control
;
28 #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
29 extern unsigned long max_mapnr
;
32 extern unsigned long num_physpages
;
33 extern unsigned long totalram_pages
;
34 extern void * high_memory
;
35 extern int page_cluster
;
38 extern int sysctl_legacy_va_layout
;
40 #define sysctl_legacy_va_layout 0
43 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
44 extern const int mmap_rnd_bits_min
;
45 extern const int mmap_rnd_bits_max
;
46 extern int mmap_rnd_bits __read_mostly
;
48 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
49 extern const int mmap_rnd_compat_bits_min
;
50 extern const int mmap_rnd_compat_bits_max
;
51 extern int mmap_rnd_compat_bits __read_mostly
;
55 #include <asm/pgtable.h>
56 #include <asm/processor.h>
58 extern unsigned long sysctl_user_reserve_kbytes
;
59 extern unsigned long sysctl_admin_reserve_kbytes
;
61 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
63 /* to align the pointer to the (next) page boundary */
64 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
66 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
67 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
70 * Linux kernel virtual memory manager primitives.
71 * The idea being to have a "virtual" mm in the same way
72 * we have a virtual fs - giving a cleaner interface to the
73 * mm details, and allowing different kinds of memory mappings
74 * (from shared memory to executable loading to arbitrary
78 extern struct kmem_cache
*vm_area_cachep
;
81 extern struct rb_root nommu_region_tree
;
82 extern struct rw_semaphore nommu_region_sem
;
84 extern unsigned int kobjsize(const void *objp
);
88 * vm_flags in vm_area_struct, see mm_types.h.
90 #define VM_NONE 0x00000000
92 #define VM_READ 0x00000001 /* currently active flags */
93 #define VM_WRITE 0x00000002
94 #define VM_EXEC 0x00000004
95 #define VM_SHARED 0x00000008
97 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
98 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
99 #define VM_MAYWRITE 0x00000020
100 #define VM_MAYEXEC 0x00000040
101 #define VM_MAYSHARE 0x00000080
103 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
104 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
105 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
107 #define VM_LOCKED 0x00002000
108 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
110 /* Used by sys_madvise() */
111 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
112 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
114 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
115 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
116 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
117 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
118 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
119 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
120 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
121 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
123 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
124 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
125 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
126 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
128 #if defined(CONFIG_X86)
129 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
130 #elif defined(CONFIG_PPC)
131 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
132 #elif defined(CONFIG_PARISC)
133 # define VM_GROWSUP VM_ARCH_1
134 #elif defined(CONFIG_METAG)
135 # define VM_GROWSUP VM_ARCH_1
136 #elif defined(CONFIG_IA64)
137 # define VM_GROWSUP VM_ARCH_1
138 #elif !defined(CONFIG_MMU)
139 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
143 # define VM_GROWSUP VM_NONE
146 /* Bits set in the VMA until the stack is in its final location */
147 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
149 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
150 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
153 #ifdef CONFIG_STACK_GROWSUP
154 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
156 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
159 #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
160 #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
161 #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
162 #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
163 #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
166 * Special vmas that are non-mergable, non-mlock()able.
167 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
169 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP)
172 * mapping from the currently active vm_flags protection bits (the
173 * low four bits) to a page protection mask..
175 extern pgprot_t protection_map
[16];
177 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
178 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
179 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
180 #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */
181 #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */
182 #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */
183 #define FAULT_FLAG_TRIED 0x40 /* second try */
184 #define FAULT_FLAG_USER 0x80 /* The fault originated in userspace */
187 * vm_fault is filled by the the pagefault handler and passed to the vma's
188 * ->fault function. The vma's ->fault is responsible for returning a bitmask
189 * of VM_FAULT_xxx flags that give details about how the fault was handled.
191 * pgoff should be used in favour of virtual_address, if possible. If pgoff
192 * is used, one may implement ->remap_pages to get nonlinear mapping support.
195 unsigned int flags
; /* FAULT_FLAG_xxx flags */
196 pgoff_t pgoff
; /* Logical page offset based on vma */
197 void __user
*virtual_address
; /* Faulting virtual address */
199 struct page
*page
; /* ->fault handlers should return a
200 * page here, unless VM_FAULT_NOPAGE
201 * is set (which is also implied by
207 * These are the virtual MM functions - opening of an area, closing and
208 * unmapping it (needed to keep files on disk up-to-date etc), pointer
209 * to the functions called when a no-page or a wp-page exception occurs.
211 struct vm_operations_struct
{
212 void (*open
)(struct vm_area_struct
* area
);
213 void (*close
)(struct vm_area_struct
* area
);
214 int (*fault
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
216 /* notification that a previously read-only page is about to become
217 * writable, if an error is returned it will cause a SIGBUS */
218 int (*page_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
220 /* called by access_process_vm when get_user_pages() fails, typically
221 * for use by special VMAs that can switch between memory and hardware
223 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
224 void *buf
, int len
, int write
);
227 * set_policy() op must add a reference to any non-NULL @new mempolicy
228 * to hold the policy upon return. Caller should pass NULL @new to
229 * remove a policy and fall back to surrounding context--i.e. do not
230 * install a MPOL_DEFAULT policy, nor the task or system default
233 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
236 * get_policy() op must add reference [mpol_get()] to any policy at
237 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
238 * in mm/mempolicy.c will do this automatically.
239 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
240 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
241 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
242 * must return NULL--i.e., do not "fallback" to task or system default
245 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
247 int (*migrate
)(struct vm_area_struct
*vma
, const nodemask_t
*from
,
248 const nodemask_t
*to
, unsigned long flags
);
250 /* called by sys_remap_file_pages() to populate non-linear mapping */
251 int (*remap_pages
)(struct vm_area_struct
*vma
, unsigned long addr
,
252 unsigned long size
, pgoff_t pgoff
);
258 #define page_private(page) ((page)->private)
259 #define set_page_private(page, v) ((page)->private = (v))
261 /* It's valid only if the page is free path or free_list */
262 static inline void set_freepage_migratetype(struct page
*page
, int migratetype
)
264 page
->index
= migratetype
;
267 /* It's valid only if the page is free path or free_list */
268 static inline int get_freepage_migratetype(struct page
*page
)
274 * FIXME: take this include out, include page-flags.h in
275 * files which need it (119 of them)
277 #include <linux/page-flags.h>
278 #include <linux/huge_mm.h>
281 * Methods to modify the page usage count.
283 * What counts for a page usage:
284 * - cache mapping (page->mapping)
285 * - private data (page->private)
286 * - page mapped in a task's page tables, each mapping
287 * is counted separately
289 * Also, many kernel routines increase the page count before a critical
290 * routine so they can be sure the page doesn't go away from under them.
294 * Drop a ref, return true if the refcount fell to zero (the page has no users)
296 static inline int put_page_testzero(struct page
*page
)
298 VM_BUG_ON(atomic_read(&page
->_count
) == 0);
299 return atomic_dec_and_test(&page
->_count
);
303 * Try to grab a ref unless the page has a refcount of zero, return false if
306 static inline int get_page_unless_zero(struct page
*page
)
308 return atomic_inc_not_zero(&page
->_count
);
311 extern int page_is_ram(unsigned long pfn
);
313 /* Support for virtually mapped pages */
314 struct page
*vmalloc_to_page(const void *addr
);
315 unsigned long vmalloc_to_pfn(const void *addr
);
318 * Determine if an address is within the vmalloc range
320 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
321 * is no special casing required.
323 static inline int is_vmalloc_addr(const void *x
)
326 unsigned long addr
= (unsigned long)x
;
328 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
334 extern int is_vmalloc_or_module_addr(const void *x
);
336 static inline int is_vmalloc_or_module_addr(const void *x
)
342 extern void kvfree(const void *addr
);
344 static inline void compound_lock(struct page
*page
)
346 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
347 VM_BUG_ON(PageSlab(page
));
348 bit_spin_lock(PG_compound_lock
, &page
->flags
);
352 static inline void compound_unlock(struct page
*page
)
354 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
355 VM_BUG_ON(PageSlab(page
));
356 bit_spin_unlock(PG_compound_lock
, &page
->flags
);
360 static inline unsigned long compound_lock_irqsave(struct page
*page
)
362 unsigned long uninitialized_var(flags
);
363 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
364 local_irq_save(flags
);
370 static inline void compound_unlock_irqrestore(struct page
*page
,
373 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
374 compound_unlock(page
);
375 local_irq_restore(flags
);
379 static inline struct page
*compound_head(struct page
*page
)
381 if (unlikely(PageTail(page
))) {
382 struct page
*head
= page
->first_page
;
385 * page->first_page may be a dangling pointer to an old
386 * compound page, so recheck that it is still a tail
387 * page before returning.
390 if (likely(PageTail(page
)))
397 * The atomic page->_mapcount, starts from -1: so that transitions
398 * both from it and to it can be tracked, using atomic_inc_and_test
399 * and atomic_add_negative(-1).
401 static inline void page_mapcount_reset(struct page
*page
)
403 atomic_set(&(page
)->_mapcount
, -1);
406 static inline int page_mapcount(struct page
*page
)
408 return atomic_read(&(page
)->_mapcount
) + 1;
411 static inline int page_count(struct page
*page
)
413 return atomic_read(&compound_head(page
)->_count
);
416 static inline void get_huge_page_tail(struct page
*page
)
419 * __split_huge_page_refcount() cannot run
422 VM_BUG_ON(page_mapcount(page
) < 0);
423 VM_BUG_ON(atomic_read(&page
->_count
) != 0);
424 atomic_inc(&page
->_mapcount
);
427 extern bool __get_page_tail(struct page
*page
);
429 static inline void get_page(struct page
*page
)
431 if (unlikely(PageTail(page
)))
432 if (likely(__get_page_tail(page
)))
435 * Getting a normal page or the head of a compound page
436 * requires to already have an elevated page->_count.
438 VM_BUG_ON(atomic_read(&page
->_count
) <= 0);
439 atomic_inc(&page
->_count
);
442 static inline struct page
*virt_to_head_page(const void *x
)
444 struct page
*page
= virt_to_page(x
);
445 return compound_head(page
);
449 * Setup the page count before being freed into the page allocator for
450 * the first time (boot or memory hotplug)
452 static inline void init_page_count(struct page
*page
)
454 atomic_set(&page
->_count
, 1);
458 * PageBuddy() indicate that the page is free and in the buddy system
459 * (see mm/page_alloc.c).
461 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
462 * -2 so that an underflow of the page_mapcount() won't be mistaken
463 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
464 * efficiently by most CPU architectures.
466 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
468 static inline int PageBuddy(struct page
*page
)
470 return atomic_read(&page
->_mapcount
) == PAGE_BUDDY_MAPCOUNT_VALUE
;
473 static inline void __SetPageBuddy(struct page
*page
)
475 VM_BUG_ON(atomic_read(&page
->_mapcount
) != -1);
476 atomic_set(&page
->_mapcount
, PAGE_BUDDY_MAPCOUNT_VALUE
);
479 static inline void __ClearPageBuddy(struct page
*page
)
481 VM_BUG_ON(!PageBuddy(page
));
482 atomic_set(&page
->_mapcount
, -1);
485 void put_page(struct page
*page
);
486 void put_pages_list(struct list_head
*pages
);
488 void split_page(struct page
*page
, unsigned int order
);
489 int split_free_page(struct page
*page
);
492 * Compound pages have a destructor function. Provide a
493 * prototype for that function and accessor functions.
494 * These are _only_ valid on the head of a PG_compound page.
496 typedef void compound_page_dtor(struct page
*);
498 static inline void set_compound_page_dtor(struct page
*page
,
499 compound_page_dtor
*dtor
)
501 page
[1].lru
.next
= (void *)dtor
;
504 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
506 return (compound_page_dtor
*)page
[1].lru
.next
;
509 static inline int compound_order(struct page
*page
)
513 return (unsigned long)page
[1].lru
.prev
;
516 static inline int compound_trans_order(struct page
*page
)
524 flags
= compound_lock_irqsave(page
);
525 order
= compound_order(page
);
526 compound_unlock_irqrestore(page
, flags
);
530 static inline void set_compound_order(struct page
*page
, unsigned long order
)
532 page
[1].lru
.prev
= (void *)order
;
537 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
538 * servicing faults for write access. In the normal case, do always want
539 * pte_mkwrite. But get_user_pages can cause write faults for mappings
540 * that do not have writing enabled, when used by access_process_vm.
542 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
544 if (likely(vma
->vm_flags
& VM_WRITE
))
545 pte
= pte_mkwrite(pte
);
551 * Multiple processes may "see" the same page. E.g. for untouched
552 * mappings of /dev/null, all processes see the same page full of
553 * zeroes, and text pages of executables and shared libraries have
554 * only one copy in memory, at most, normally.
556 * For the non-reserved pages, page_count(page) denotes a reference count.
557 * page_count() == 0 means the page is free. page->lru is then used for
558 * freelist management in the buddy allocator.
559 * page_count() > 0 means the page has been allocated.
561 * Pages are allocated by the slab allocator in order to provide memory
562 * to kmalloc and kmem_cache_alloc. In this case, the management of the
563 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
564 * unless a particular usage is carefully commented. (the responsibility of
565 * freeing the kmalloc memory is the caller's, of course).
567 * A page may be used by anyone else who does a __get_free_page().
568 * In this case, page_count still tracks the references, and should only
569 * be used through the normal accessor functions. The top bits of page->flags
570 * and page->virtual store page management information, but all other fields
571 * are unused and could be used privately, carefully. The management of this
572 * page is the responsibility of the one who allocated it, and those who have
573 * subsequently been given references to it.
575 * The other pages (we may call them "pagecache pages") are completely
576 * managed by the Linux memory manager: I/O, buffers, swapping etc.
577 * The following discussion applies only to them.
579 * A pagecache page contains an opaque `private' member, which belongs to the
580 * page's address_space. Usually, this is the address of a circular list of
581 * the page's disk buffers. PG_private must be set to tell the VM to call
582 * into the filesystem to release these pages.
584 * A page may belong to an inode's memory mapping. In this case, page->mapping
585 * is the pointer to the inode, and page->index is the file offset of the page,
586 * in units of PAGE_CACHE_SIZE.
588 * If pagecache pages are not associated with an inode, they are said to be
589 * anonymous pages. These may become associated with the swapcache, and in that
590 * case PG_swapcache is set, and page->private is an offset into the swapcache.
592 * In either case (swapcache or inode backed), the pagecache itself holds one
593 * reference to the page. Setting PG_private should also increment the
594 * refcount. The each user mapping also has a reference to the page.
596 * The pagecache pages are stored in a per-mapping radix tree, which is
597 * rooted at mapping->page_tree, and indexed by offset.
598 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
599 * lists, we instead now tag pages as dirty/writeback in the radix tree.
601 * All pagecache pages may be subject to I/O:
602 * - inode pages may need to be read from disk,
603 * - inode pages which have been modified and are MAP_SHARED may need
604 * to be written back to the inode on disk,
605 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
606 * modified may need to be swapped out to swap space and (later) to be read
611 * The zone field is never updated after free_area_init_core()
612 * sets it, so none of the operations on it need to be atomic.
615 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_NID] | ... | FLAGS | */
616 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
617 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
618 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
619 #define LAST_NID_PGOFF (ZONES_PGOFF - LAST_NID_WIDTH)
622 * Define the bit shifts to access each section. For non-existent
623 * sections we define the shift as 0; that plus a 0 mask ensures
624 * the compiler will optimise away reference to them.
626 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
627 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
628 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
629 #define LAST_NID_PGSHIFT (LAST_NID_PGOFF * (LAST_NID_WIDTH != 0))
631 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
632 #ifdef NODE_NOT_IN_PAGE_FLAGS
633 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
634 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
635 SECTIONS_PGOFF : ZONES_PGOFF)
637 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
638 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
639 NODES_PGOFF : ZONES_PGOFF)
642 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
644 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
645 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
648 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
649 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
650 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
651 #define LAST_NID_MASK ((1UL << LAST_NID_WIDTH) - 1)
652 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
654 static inline enum zone_type
page_zonenum(const struct page
*page
)
656 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
659 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
660 #define SECTION_IN_PAGE_FLAGS
664 * The identification function is only used by the buddy allocator for
665 * determining if two pages could be buddies. We are not really
666 * identifying a zone since we could be using a the section number
667 * id if we have not node id available in page flags.
668 * We guarantee only that it will return the same value for two
669 * combinable pages in a zone.
671 static inline int page_zone_id(struct page
*page
)
673 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
676 static inline int zone_to_nid(struct zone
*zone
)
685 #ifdef NODE_NOT_IN_PAGE_FLAGS
686 extern int page_to_nid(const struct page
*page
);
688 static inline int page_to_nid(const struct page
*page
)
690 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
694 #ifdef CONFIG_NUMA_BALANCING
695 #ifdef LAST_NID_NOT_IN_PAGE_FLAGS
696 static inline int page_nid_xchg_last(struct page
*page
, int nid
)
698 return xchg(&page
->_last_nid
, nid
);
701 static inline int page_nid_last(struct page
*page
)
703 return page
->_last_nid
;
705 static inline void page_nid_reset_last(struct page
*page
)
707 page
->_last_nid
= -1;
710 static inline int page_nid_last(struct page
*page
)
712 return (page
->flags
>> LAST_NID_PGSHIFT
) & LAST_NID_MASK
;
715 extern int page_nid_xchg_last(struct page
*page
, int nid
);
717 static inline void page_nid_reset_last(struct page
*page
)
719 int nid
= (1 << LAST_NID_SHIFT
) - 1;
721 page
->flags
&= ~(LAST_NID_MASK
<< LAST_NID_PGSHIFT
);
722 page
->flags
|= (nid
& LAST_NID_MASK
) << LAST_NID_PGSHIFT
;
724 #endif /* LAST_NID_NOT_IN_PAGE_FLAGS */
726 static inline int page_nid_xchg_last(struct page
*page
, int nid
)
728 return page_to_nid(page
);
731 static inline int page_nid_last(struct page
*page
)
733 return page_to_nid(page
);
736 static inline void page_nid_reset_last(struct page
*page
)
741 static inline struct zone
*page_zone(const struct page
*page
)
743 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
746 #ifdef SECTION_IN_PAGE_FLAGS
747 static inline void set_page_section(struct page
*page
, unsigned long section
)
749 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
750 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
753 static inline unsigned long page_to_section(const struct page
*page
)
755 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
759 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
761 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
762 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
765 static inline void set_page_node(struct page
*page
, unsigned long node
)
767 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
768 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
771 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
772 unsigned long node
, unsigned long pfn
)
774 set_page_zone(page
, zone
);
775 set_page_node(page
, node
);
776 #ifdef SECTION_IN_PAGE_FLAGS
777 set_page_section(page
, pfn_to_section_nr(pfn
));
782 * Some inline functions in vmstat.h depend on page_zone()
784 #include <linux/vmstat.h>
786 static __always_inline
void *lowmem_page_address(const struct page
*page
)
788 return __va(PFN_PHYS(page_to_pfn(page
)));
791 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
792 #define HASHED_PAGE_VIRTUAL
795 #if defined(WANT_PAGE_VIRTUAL)
796 static inline void *page_address(const struct page
*page
)
798 return page
->virtual;
800 static inline void set_page_address(struct page
*page
, void *address
)
802 page
->virtual = address
;
804 #define page_address_init() do { } while(0)
807 #if defined(HASHED_PAGE_VIRTUAL)
808 void *page_address(const struct page
*page
);
809 void set_page_address(struct page
*page
, void *virtual);
810 void page_address_init(void);
813 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
814 #define page_address(page) lowmem_page_address(page)
815 #define set_page_address(page, address) do { } while(0)
816 #define page_address_init() do { } while(0)
820 * On an anonymous page mapped into a user virtual memory area,
821 * page->mapping points to its anon_vma, not to a struct address_space;
822 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
824 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
825 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
826 * and then page->mapping points, not to an anon_vma, but to a private
827 * structure which KSM associates with that merged page. See ksm.h.
829 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
831 * Please note that, confusingly, "page_mapping" refers to the inode
832 * address_space which maps the page from disk; whereas "page_mapped"
833 * refers to user virtual address space into which the page is mapped.
835 #define PAGE_MAPPING_ANON 1
836 #define PAGE_MAPPING_KSM 2
837 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
839 extern struct address_space
*page_mapping(struct page
*page
);
841 /* Neutral page->mapping pointer to address_space or anon_vma or other */
842 static inline void *page_rmapping(struct page
*page
)
844 return (void *)((unsigned long)page
->mapping
& ~PAGE_MAPPING_FLAGS
);
847 extern struct address_space
*__page_file_mapping(struct page
*);
850 struct address_space
*page_file_mapping(struct page
*page
)
852 if (unlikely(PageSwapCache(page
)))
853 return __page_file_mapping(page
);
855 return page
->mapping
;
858 static inline int PageAnon(struct page
*page
)
860 return ((unsigned long)page
->mapping
& PAGE_MAPPING_ANON
) != 0;
864 * Return the pagecache index of the passed page. Regular pagecache pages
865 * use ->index whereas swapcache pages use ->private
867 static inline pgoff_t
page_index(struct page
*page
)
869 if (unlikely(PageSwapCache(page
)))
870 return page_private(page
);
874 extern pgoff_t
__page_file_index(struct page
*page
);
877 * Return the file index of the page. Regular pagecache pages use ->index
878 * whereas swapcache pages use swp_offset(->private)
880 static inline pgoff_t
page_file_index(struct page
*page
)
882 if (unlikely(PageSwapCache(page
)))
883 return __page_file_index(page
);
889 * Return true if this page is mapped into pagetables.
891 static inline int page_mapped(struct page
*page
)
893 return atomic_read(&(page
)->_mapcount
) >= 0;
897 * Different kinds of faults, as returned by handle_mm_fault().
898 * Used to decide whether a process gets delivered SIGBUS or
899 * just gets major/minor fault counters bumped up.
902 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
904 #define VM_FAULT_OOM 0x0001
905 #define VM_FAULT_SIGBUS 0x0002
906 #define VM_FAULT_MAJOR 0x0004
907 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
908 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
909 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
910 #define VM_FAULT_SIGSEGV 0x0040
912 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
913 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
914 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
916 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
918 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
919 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE)
921 /* Encode hstate index for a hwpoisoned large page */
922 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
923 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
926 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
928 extern void pagefault_out_of_memory(void);
930 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
933 * Flags passed to show_mem() and show_free_areas() to suppress output in
936 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
937 #define SHOW_MEM_FILTER_PAGE_COUNT (0x0002u) /* page type count */
939 extern void show_free_areas(unsigned int flags
);
940 extern bool skip_free_areas_node(unsigned int flags
, int nid
);
942 void shmem_set_file(struct vm_area_struct
*vma
, struct file
*file
);
943 int shmem_zero_setup(struct vm_area_struct
*);
945 extern int can_do_mlock(void);
946 extern int user_shm_lock(size_t, struct user_struct
*);
947 extern void user_shm_unlock(size_t, struct user_struct
*);
950 * Parameter block passed down to zap_pte_range in exceptional cases.
953 struct vm_area_struct
*nonlinear_vma
; /* Check page->index if set */
954 struct address_space
*check_mapping
; /* Check page->mapping if set */
955 pgoff_t first_index
; /* Lowest page->index to unmap */
956 pgoff_t last_index
; /* Highest page->index to unmap */
959 struct page
*vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
962 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
964 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
965 unsigned long size
, struct zap_details
*);
966 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
967 unsigned long start
, unsigned long end
);
970 * mm_walk - callbacks for walk_page_range
971 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
972 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
973 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
974 * this handler is required to be able to handle
975 * pmd_trans_huge() pmds. They may simply choose to
976 * split_huge_page() instead of handling it explicitly.
977 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
978 * @pte_hole: if set, called for each hole at all levels
979 * @hugetlb_entry: if set, called for each hugetlb entry
980 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
983 * (see walk_page_range for more details)
986 int (*pgd_entry
)(pgd_t
*pgd
, unsigned long addr
,
987 unsigned long next
, struct mm_walk
*walk
);
988 int (*pud_entry
)(pud_t
*pud
, unsigned long addr
,
989 unsigned long next
, struct mm_walk
*walk
);
990 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
991 unsigned long next
, struct mm_walk
*walk
);
992 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
993 unsigned long next
, struct mm_walk
*walk
);
994 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
995 struct mm_walk
*walk
);
996 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
997 unsigned long addr
, unsigned long next
,
998 struct mm_walk
*walk
);
999 struct mm_struct
*mm
;
1003 int walk_page_range(unsigned long addr
, unsigned long end
,
1004 struct mm_walk
*walk
);
1005 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1006 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1007 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1008 struct vm_area_struct
*vma
);
1009 void unmap_mapping_range(struct address_space
*mapping
,
1010 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1011 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1012 unsigned long *pfn
);
1013 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1014 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1015 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1016 void *buf
, int len
, int write
);
1018 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1019 loff_t
const holebegin
, loff_t
const holelen
)
1021 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1024 extern void truncate_pagecache(struct inode
*inode
, loff_t old
, loff_t
new);
1025 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1026 void pagecache_isize_extended(struct inode
*inode
, loff_t from
, loff_t to
);
1027 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1028 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1029 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1030 int invalidate_inode_page(struct page
*page
);
1033 extern int handle_mm_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1034 unsigned long address
, unsigned int flags
);
1035 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1036 unsigned long address
, unsigned int fault_flags
);
1038 static inline int handle_mm_fault(struct mm_struct
*mm
,
1039 struct vm_area_struct
*vma
, unsigned long address
,
1042 /* should never happen if there's no MMU */
1044 return VM_FAULT_SIGBUS
;
1046 static inline int fixup_user_fault(struct task_struct
*tsk
,
1047 struct mm_struct
*mm
, unsigned long address
,
1048 unsigned int fault_flags
)
1050 /* should never happen if there's no MMU */
1056 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
1057 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1058 void *buf
, int len
, int write
);
1060 long __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1061 unsigned long start
, unsigned long nr_pages
,
1062 unsigned int foll_flags
, struct page
**pages
,
1063 struct vm_area_struct
**vmas
, int *nonblocking
);
1064 long get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1065 unsigned long start
, unsigned long nr_pages
,
1066 int write
, int force
, struct page
**pages
,
1067 struct vm_area_struct
**vmas
);
1068 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1069 struct page
**pages
);
1071 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1072 struct page
**pages
);
1073 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1074 struct page
*get_dump_page(unsigned long addr
);
1076 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1077 extern void do_invalidatepage(struct page
*page
, unsigned long offset
);
1079 int __set_page_dirty_nobuffers(struct page
*page
);
1080 int __set_page_dirty_no_writeback(struct page
*page
);
1081 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1083 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1084 void account_page_writeback(struct page
*page
);
1085 int set_page_dirty(struct page
*page
);
1086 int set_page_dirty_lock(struct page
*page
);
1087 int clear_page_dirty_for_io(struct page
*page
);
1088 int get_cmdline(struct task_struct
*task
, char *buffer
, int buflen
);
1091 vm_is_stack(struct task_struct
*task
, struct vm_area_struct
*vma
, int in_group
);
1093 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1094 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1095 unsigned long new_addr
, unsigned long len
,
1096 bool need_rmap_locks
);
1097 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1098 unsigned long end
, pgprot_t newprot
,
1099 int dirty_accountable
, int prot_numa
);
1100 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1101 struct vm_area_struct
**pprev
, unsigned long start
,
1102 unsigned long end
, unsigned long newflags
);
1105 * doesn't attempt to fault and will return short.
1107 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1108 struct page
**pages
);
1110 * per-process(per-mm_struct) statistics.
1112 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1114 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1116 #ifdef SPLIT_RSS_COUNTING
1118 * counter is updated in asynchronous manner and may go to minus.
1119 * But it's never be expected number for users.
1124 return (unsigned long)val
;
1127 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1129 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1132 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1134 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1137 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1139 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1142 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1144 return get_mm_counter(mm
, MM_FILEPAGES
) +
1145 get_mm_counter(mm
, MM_ANONPAGES
);
1148 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1150 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1153 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1155 return max(mm
->hiwater_vm
, mm
->total_vm
);
1158 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1160 unsigned long _rss
= get_mm_rss(mm
);
1162 if ((mm
)->hiwater_rss
< _rss
)
1163 (mm
)->hiwater_rss
= _rss
;
1166 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1168 if (mm
->hiwater_vm
< mm
->total_vm
)
1169 mm
->hiwater_vm
= mm
->total_vm
;
1172 static inline void reset_mm_hiwater_rss(struct mm_struct
*mm
)
1174 mm
->hiwater_rss
= get_mm_rss(mm
);
1177 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1178 struct mm_struct
*mm
)
1180 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1182 if (*maxrss
< hiwater_rss
)
1183 *maxrss
= hiwater_rss
;
1186 #if defined(SPLIT_RSS_COUNTING)
1187 void sync_mm_rss(struct mm_struct
*mm
);
1189 static inline void sync_mm_rss(struct mm_struct
*mm
)
1194 int vma_wants_writenotify(struct vm_area_struct
*vma
);
1196 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1198 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1202 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1206 #ifdef __PAGETABLE_PUD_FOLDED
1207 static inline int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1208 unsigned long address
)
1213 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1216 #ifdef __PAGETABLE_PMD_FOLDED
1217 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1218 unsigned long address
)
1223 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1226 int __pte_alloc(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1227 pmd_t
*pmd
, unsigned long address
);
1228 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1231 * The following ifdef needed to get the 4level-fixup.h header to work.
1232 * Remove it when 4level-fixup.h has been removed.
1234 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1235 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
1237 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
1238 NULL
: pud_offset(pgd
, address
);
1241 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1243 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1244 NULL
: pmd_offset(pud
, address
);
1246 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1248 #if USE_SPLIT_PTLOCKS
1250 * We tuck a spinlock to guard each pagetable page into its struct page,
1251 * at page->private, with BUILD_BUG_ON to make sure that this will not
1252 * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
1253 * When freeing, reset page->mapping so free_pages_check won't complain.
1255 #define __pte_lockptr(page) &((page)->ptl)
1256 #define pte_lock_init(_page) do { \
1257 spin_lock_init(__pte_lockptr(_page)); \
1259 #define pte_lock_deinit(page) ((page)->mapping = NULL)
1260 #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
1261 #else /* !USE_SPLIT_PTLOCKS */
1263 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1265 #define pte_lock_init(page) do {} while (0)
1266 #define pte_lock_deinit(page) do {} while (0)
1267 #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
1268 #endif /* USE_SPLIT_PTLOCKS */
1270 static inline void pgtable_page_ctor(struct page
*page
)
1272 pte_lock_init(page
);
1273 inc_zone_page_state(page
, NR_PAGETABLE
);
1276 static inline void pgtable_page_dtor(struct page
*page
)
1278 pte_lock_deinit(page
);
1279 dec_zone_page_state(page
, NR_PAGETABLE
);
1282 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1284 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1285 pte_t *__pte = pte_offset_map(pmd, address); \
1291 #define pte_unmap_unlock(pte, ptl) do { \
1296 #define pte_alloc_map(mm, vma, pmd, address) \
1297 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1299 NULL: pte_offset_map(pmd, address))
1301 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1302 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1304 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1306 #define pte_alloc_kernel(pmd, address) \
1307 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1308 NULL: pte_offset_kernel(pmd, address))
1310 extern void free_area_init(unsigned long * zones_size
);
1311 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1312 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1313 extern void free_initmem(void);
1316 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1317 * into the buddy system. The freed pages will be poisoned with pattern
1318 * "poison" if it's non-zero.
1319 * Return pages freed into the buddy system.
1321 extern unsigned long free_reserved_area(unsigned long start
, unsigned long end
,
1322 int poison
, char *s
);
1323 #ifdef CONFIG_HIGHMEM
1325 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1326 * and totalram_pages.
1328 extern void free_highmem_page(struct page
*page
);
1331 static inline void adjust_managed_page_count(struct page
*page
, long count
)
1333 totalram_pages
+= count
;
1336 /* Free the reserved page into the buddy system, so it gets managed. */
1337 static inline void __free_reserved_page(struct page
*page
)
1339 ClearPageReserved(page
);
1340 init_page_count(page
);
1344 static inline void free_reserved_page(struct page
*page
)
1346 __free_reserved_page(page
);
1347 adjust_managed_page_count(page
, 1);
1350 static inline void mark_page_reserved(struct page
*page
)
1352 SetPageReserved(page
);
1353 adjust_managed_page_count(page
, -1);
1357 * Default method to free all the __init memory into the buddy system.
1358 * The freed pages will be poisoned with pattern "poison" if it is
1359 * non-zero. Return pages freed into the buddy system.
1361 static inline unsigned long free_initmem_default(int poison
)
1363 extern char __init_begin
[], __init_end
[];
1365 return free_reserved_area(PAGE_ALIGN((unsigned long)&__init_begin
) ,
1366 ((unsigned long)&__init_end
) & PAGE_MASK
,
1367 poison
, "unused kernel");
1370 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1372 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1373 * zones, allocate the backing mem_map and account for memory holes in a more
1374 * architecture independent manner. This is a substitute for creating the
1375 * zone_sizes[] and zholes_size[] arrays and passing them to
1376 * free_area_init_node()
1378 * An architecture is expected to register range of page frames backed by
1379 * physical memory with memblock_add[_node]() before calling
1380 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1381 * usage, an architecture is expected to do something like
1383 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1385 * for_each_valid_physical_page_range()
1386 * memblock_add_node(base, size, nid)
1387 * free_area_init_nodes(max_zone_pfns);
1389 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1390 * registered physical page range. Similarly
1391 * sparse_memory_present_with_active_regions() calls memory_present() for
1392 * each range when SPARSEMEM is enabled.
1394 * See mm/page_alloc.c for more information on each function exposed by
1395 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1397 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1398 unsigned long node_map_pfn_alignment(void);
1399 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1400 unsigned long end_pfn
);
1401 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1402 unsigned long end_pfn
);
1403 extern void get_pfn_range_for_nid(unsigned int nid
,
1404 unsigned long *start_pfn
, unsigned long *end_pfn
);
1405 extern unsigned long find_min_pfn_with_active_regions(void);
1406 extern void free_bootmem_with_active_regions(int nid
,
1407 unsigned long max_low_pfn
);
1408 extern void sparse_memory_present_with_active_regions(int nid
);
1410 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1412 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1413 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1414 static inline int __early_pfn_to_nid(unsigned long pfn
)
1419 /* please see mm/page_alloc.c */
1420 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1421 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
1422 /* there is a per-arch backend function. */
1423 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
);
1424 #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
1427 extern void set_dma_reserve(unsigned long new_dma_reserve
);
1428 extern void memmap_init_zone(unsigned long, int, unsigned long,
1429 unsigned long, enum memmap_context
);
1430 extern void setup_per_zone_wmarks(void);
1431 extern int __meminit
init_per_zone_wmark_min(void);
1432 extern void mem_init(void);
1433 extern void __init
mmap_init(void);
1434 extern void show_mem(unsigned int flags
);
1435 extern void si_meminfo(struct sysinfo
* val
);
1436 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
1438 extern __printf(3, 4)
1439 void warn_alloc_failed(gfp_t gfp_mask
, int order
, const char *fmt
, ...);
1441 extern void setup_per_cpu_pageset(void);
1443 extern void zone_pcp_update(struct zone
*zone
);
1444 extern void zone_pcp_reset(struct zone
*zone
);
1447 extern int min_free_kbytes
;
1450 extern atomic_long_t mmap_pages_allocated
;
1451 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
1453 /* interval_tree.c */
1454 void vma_interval_tree_insert(struct vm_area_struct
*node
,
1455 struct rb_root
*root
);
1456 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
1457 struct vm_area_struct
*prev
,
1458 struct rb_root
*root
);
1459 void vma_interval_tree_remove(struct vm_area_struct
*node
,
1460 struct rb_root
*root
);
1461 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root
*root
,
1462 unsigned long start
, unsigned long last
);
1463 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
1464 unsigned long start
, unsigned long last
);
1466 #define vma_interval_tree_foreach(vma, root, start, last) \
1467 for (vma = vma_interval_tree_iter_first(root, start, last); \
1468 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1470 static inline void vma_nonlinear_insert(struct vm_area_struct
*vma
,
1471 struct list_head
*list
)
1473 list_add_tail(&vma
->shared
.nonlinear
, list
);
1476 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
1477 struct rb_root
*root
);
1478 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
1479 struct rb_root
*root
);
1480 struct anon_vma_chain
*anon_vma_interval_tree_iter_first(
1481 struct rb_root
*root
, unsigned long start
, unsigned long last
);
1482 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
1483 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
1484 #ifdef CONFIG_DEBUG_VM_RB
1485 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
1488 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1489 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1490 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1493 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
1494 extern int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
1495 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
1496 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
1497 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
1498 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
1499 struct mempolicy
*, const char __user
*);
1500 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
1501 extern int split_vma(struct mm_struct
*,
1502 struct vm_area_struct
*, unsigned long addr
, int new_below
);
1503 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
1504 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
1505 struct rb_node
**, struct rb_node
*);
1506 extern void unlink_file_vma(struct vm_area_struct
*);
1507 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
1508 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
1509 bool *need_rmap_locks
);
1510 extern void exit_mmap(struct mm_struct
*);
1512 extern int mm_take_all_locks(struct mm_struct
*mm
);
1513 extern void mm_drop_all_locks(struct mm_struct
*mm
);
1515 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
1516 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
1518 extern int may_expand_vm(struct mm_struct
*mm
, unsigned long npages
);
1519 extern int install_special_mapping(struct mm_struct
*mm
,
1520 unsigned long addr
, unsigned long len
,
1521 unsigned long flags
, struct page
**pages
);
1523 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1525 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
1526 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
);
1527 extern unsigned long do_mmap_pgoff(struct file
*file
, unsigned long addr
,
1528 unsigned long len
, unsigned long prot
, unsigned long flags
,
1529 unsigned long pgoff
, unsigned long *populate
);
1530 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
1533 extern int __mm_populate(unsigned long addr
, unsigned long len
,
1535 static inline void mm_populate(unsigned long addr
, unsigned long len
)
1538 (void) __mm_populate(addr
, len
, 1);
1541 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
1544 /* These take the mm semaphore themselves */
1545 extern unsigned long vm_brk(unsigned long, unsigned long);
1546 extern int vm_munmap(unsigned long, size_t);
1547 extern unsigned long vm_mmap(struct file
*, unsigned long,
1548 unsigned long, unsigned long,
1549 unsigned long, unsigned long);
1551 struct vm_unmapped_area_info
{
1552 #define VM_UNMAPPED_AREA_TOPDOWN 1
1553 unsigned long flags
;
1554 unsigned long length
;
1555 unsigned long low_limit
;
1556 unsigned long high_limit
;
1557 unsigned long align_mask
;
1558 unsigned long align_offset
;
1561 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
1562 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
1565 * Search for an unmapped address range.
1567 * We are looking for a range that:
1568 * - does not intersect with any VMA;
1569 * - is contained within the [low_limit, high_limit) interval;
1570 * - is at least the desired size.
1571 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1573 static inline unsigned long
1574 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
1576 if (!(info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
))
1577 return unmapped_area(info
);
1579 return unmapped_area_topdown(info
);
1583 extern void truncate_inode_pages(struct address_space
*, loff_t
);
1584 extern void truncate_inode_pages_range(struct address_space
*,
1585 loff_t lstart
, loff_t lend
);
1586 extern void truncate_inode_pages_final(struct address_space
*);
1588 /* generic vm_area_ops exported for stackable file systems */
1589 extern int filemap_fault(struct vm_area_struct
*, struct vm_fault
*);
1590 extern int filemap_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1592 /* mm/page-writeback.c */
1593 int write_one_page(struct page
*page
, int wait
);
1594 void task_dirty_inc(struct task_struct
*tsk
);
1597 #define VM_MAX_READAHEAD 128 /* kbytes */
1598 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1600 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
1601 pgoff_t offset
, unsigned long nr_to_read
);
1603 void page_cache_sync_readahead(struct address_space
*mapping
,
1604 struct file_ra_state
*ra
,
1607 unsigned long size
);
1609 void page_cache_async_readahead(struct address_space
*mapping
,
1610 struct file_ra_state
*ra
,
1614 unsigned long size
);
1616 unsigned long max_sane_readahead(unsigned long nr
);
1617 unsigned long ra_submit(struct file_ra_state
*ra
,
1618 struct address_space
*mapping
,
1621 extern unsigned long stack_guard_gap
;
1622 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1623 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
1625 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1626 extern int expand_downwards(struct vm_area_struct
*vma
,
1627 unsigned long address
);
1629 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
1631 #define expand_upwards(vma, address) (0)
1634 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1635 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
1636 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
1637 struct vm_area_struct
**pprev
);
1639 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1640 NULL if none. Assume start_addr < end_addr. */
1641 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
1643 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
1645 if (vma
&& end_addr
<= vma
->vm_start
)
1650 static inline unsigned long vm_start_gap(struct vm_area_struct
*vma
)
1652 unsigned long vm_start
= vma
->vm_start
;
1654 if (vma
->vm_flags
& VM_GROWSDOWN
) {
1655 vm_start
-= stack_guard_gap
;
1656 if (vm_start
> vma
->vm_start
)
1662 static inline unsigned long vm_end_gap(struct vm_area_struct
*vma
)
1664 unsigned long vm_end
= vma
->vm_end
;
1666 if (vma
->vm_flags
& VM_GROWSUP
) {
1667 vm_end
+= stack_guard_gap
;
1668 if (vm_end
< vma
->vm_end
)
1669 vm_end
= -PAGE_SIZE
;
1674 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
1676 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
1679 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1680 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
1681 unsigned long vm_start
, unsigned long vm_end
)
1683 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
1685 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
1692 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
1694 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
1700 #ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
1701 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
1702 unsigned long start
, unsigned long end
);
1705 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
1706 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
1707 unsigned long pfn
, unsigned long size
, pgprot_t
);
1708 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
1709 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
1711 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
1713 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
1716 struct page
*follow_page_mask(struct vm_area_struct
*vma
,
1717 unsigned long address
, unsigned int foll_flags
,
1718 unsigned int *page_mask
);
1720 static inline struct page
*follow_page(struct vm_area_struct
*vma
,
1721 unsigned long address
, unsigned int foll_flags
)
1723 unsigned int unused_page_mask
;
1724 return follow_page_mask(vma
, address
, foll_flags
, &unused_page_mask
);
1727 #define FOLL_WRITE 0x01 /* check pte is writable */
1728 #define FOLL_TOUCH 0x02 /* mark page accessed */
1729 #define FOLL_GET 0x04 /* do get_page on page */
1730 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1731 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1732 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
1733 * and return without waiting upon it */
1734 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
1735 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
1736 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
1737 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
1738 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
1739 #define FOLL_COW 0x4000 /* internal GUP flag */
1740 #define FOLL_CMA 0x80000 /* migrate if the page is from cma pageblock */
1742 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
1744 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
1745 unsigned long size
, pte_fn_t fn
, void *data
);
1747 #ifdef CONFIG_PROC_FS
1748 void vm_stat_account(struct mm_struct
*, unsigned long, struct file
*, long);
1750 static inline void vm_stat_account(struct mm_struct
*mm
,
1751 unsigned long flags
, struct file
*file
, long pages
)
1753 mm
->total_vm
+= pages
;
1755 #endif /* CONFIG_PROC_FS */
1757 #ifdef CONFIG_DEBUG_PAGEALLOC
1758 extern void kernel_map_pages(struct page
*page
, int numpages
, int enable
);
1759 #ifdef CONFIG_HIBERNATION
1760 extern bool kernel_page_present(struct page
*page
);
1761 #endif /* CONFIG_HIBERNATION */
1764 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
1765 #ifdef CONFIG_HIBERNATION
1766 static inline bool kernel_page_present(struct page
*page
) { return true; }
1767 #endif /* CONFIG_HIBERNATION */
1770 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
1771 #ifdef __HAVE_ARCH_GATE_AREA
1772 int in_gate_area_no_mm(unsigned long addr
);
1773 int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
1775 int in_gate_area_no_mm(unsigned long addr
);
1776 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
1777 #endif /* __HAVE_ARCH_GATE_AREA */
1779 #ifdef CONFIG_SYSCTL
1780 extern int sysctl_drop_caches
;
1781 int drop_caches_sysctl_handler(struct ctl_table
*, int,
1782 void __user
*, size_t *, loff_t
*);
1785 unsigned long shrink_slab(struct shrink_control
*shrink
,
1786 unsigned long nr_pages_scanned
,
1787 unsigned long lru_pages
);
1790 #define randomize_va_space 0
1792 extern int randomize_va_space
;
1795 const char * arch_vma_name(struct vm_area_struct
*vma
);
1796 void print_vma_addr(char *prefix
, unsigned long rip
);
1798 void sparse_mem_maps_populate_node(struct page
**map_map
,
1799 unsigned long pnum_begin
,
1800 unsigned long pnum_end
,
1801 unsigned long map_count
,
1804 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
1805 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
1806 pud_t
*vmemmap_pud_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
1807 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
1808 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
1809 void *vmemmap_alloc_block(unsigned long size
, int node
);
1810 void *vmemmap_alloc_block_buf(unsigned long size
, int node
);
1811 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
1812 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
1814 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
);
1815 void vmemmap_populate_print_last(void);
1816 #ifdef CONFIG_MEMORY_HOTPLUG
1817 void vmemmap_free(unsigned long start
, unsigned long end
);
1819 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
1820 unsigned long size
);
1823 MF_COUNT_INCREASED
= 1 << 0,
1824 MF_ACTION_REQUIRED
= 1 << 1,
1825 MF_MUST_KILL
= 1 << 2,
1827 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
1828 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
1829 extern int unpoison_memory(unsigned long pfn
);
1830 extern int sysctl_memory_failure_early_kill
;
1831 extern int sysctl_memory_failure_recovery
;
1832 extern void shake_page(struct page
*p
, int access
);
1833 extern atomic_long_t num_poisoned_pages
;
1834 extern int soft_offline_page(struct page
*page
, int flags
);
1836 extern void dump_page(struct page
*page
);
1838 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
1839 extern void clear_huge_page(struct page
*page
,
1841 unsigned int pages_per_huge_page
);
1842 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
1843 unsigned long addr
, struct vm_area_struct
*vma
,
1844 unsigned int pages_per_huge_page
);
1845 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
1847 #ifdef CONFIG_DEBUG_PAGEALLOC
1848 extern unsigned int _debug_guardpage_minorder
;
1850 static inline unsigned int debug_guardpage_minorder(void)
1852 return _debug_guardpage_minorder
;
1855 static inline bool page_is_guard(struct page
*page
)
1857 return test_bit(PAGE_DEBUG_FLAG_GUARD
, &page
->debug_flags
);
1860 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
1861 static inline bool page_is_guard(struct page
*page
) { return false; }
1862 #endif /* CONFIG_DEBUG_PAGEALLOC */
1864 #if MAX_NUMNODES > 1
1865 void __init
setup_nr_node_ids(void);
1867 static inline void setup_nr_node_ids(void) {}
1870 #endif /* __KERNEL__ */
1871 #endif /* _LINUX_MM_H */