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
44 #include <asm/pgtable.h>
45 #include <asm/processor.h>
47 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
49 /* to align the pointer to the (next) page boundary */
50 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
53 * Linux kernel virtual memory manager primitives.
54 * The idea being to have a "virtual" mm in the same way
55 * we have a virtual fs - giving a cleaner interface to the
56 * mm details, and allowing different kinds of memory mappings
57 * (from shared memory to executable loading to arbitrary
61 extern struct kmem_cache
*vm_area_cachep
;
64 extern struct rb_root nommu_region_tree
;
65 extern struct rw_semaphore nommu_region_sem
;
67 extern unsigned int kobjsize(const void *objp
);
71 * vm_flags in vm_area_struct, see mm_types.h.
73 #define VM_NONE 0x00000000
75 #define VM_READ 0x00000001 /* currently active flags */
76 #define VM_WRITE 0x00000002
77 #define VM_EXEC 0x00000004
78 #define VM_SHARED 0x00000008
80 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
81 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
82 #define VM_MAYWRITE 0x00000020
83 #define VM_MAYEXEC 0x00000040
84 #define VM_MAYSHARE 0x00000080
86 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
87 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
88 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
90 #define VM_POPULATE 0x00001000
91 #define VM_LOCKED 0x00002000
92 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
94 /* Used by sys_madvise() */
95 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
96 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
98 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
99 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
100 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
101 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
102 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
103 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
104 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
105 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
107 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
108 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
109 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
110 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
112 #if defined(CONFIG_X86)
113 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
114 #elif defined(CONFIG_PPC)
115 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
116 #elif defined(CONFIG_PARISC)
117 # define VM_GROWSUP VM_ARCH_1
118 #elif defined(CONFIG_IA64)
119 # define VM_GROWSUP VM_ARCH_1
120 #elif !defined(CONFIG_MMU)
121 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
125 # define VM_GROWSUP VM_NONE
128 /* Bits set in the VMA until the stack is in its final location */
129 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
131 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
132 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
135 #ifdef CONFIG_STACK_GROWSUP
136 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
138 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
141 #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
142 #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
143 #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
144 #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
145 #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
148 * Special vmas that are non-mergable, non-mlock()able.
149 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
151 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP)
154 * mapping from the currently active vm_flags protection bits (the
155 * low four bits) to a page protection mask..
157 extern pgprot_t protection_map
[16];
159 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
160 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
161 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
162 #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */
163 #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */
164 #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */
165 #define FAULT_FLAG_TRIED 0x40 /* second try */
168 * vm_fault is filled by the the pagefault handler and passed to the vma's
169 * ->fault function. The vma's ->fault is responsible for returning a bitmask
170 * of VM_FAULT_xxx flags that give details about how the fault was handled.
172 * pgoff should be used in favour of virtual_address, if possible. If pgoff
173 * is used, one may implement ->remap_pages to get nonlinear mapping support.
176 unsigned int flags
; /* FAULT_FLAG_xxx flags */
177 pgoff_t pgoff
; /* Logical page offset based on vma */
178 void __user
*virtual_address
; /* Faulting virtual address */
180 struct page
*page
; /* ->fault handlers should return a
181 * page here, unless VM_FAULT_NOPAGE
182 * is set (which is also implied by
188 * These are the virtual MM functions - opening of an area, closing and
189 * unmapping it (needed to keep files on disk up-to-date etc), pointer
190 * to the functions called when a no-page or a wp-page exception occurs.
192 struct vm_operations_struct
{
193 void (*open
)(struct vm_area_struct
* area
);
194 void (*close
)(struct vm_area_struct
* area
);
195 int (*fault
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
197 /* notification that a previously read-only page is about to become
198 * writable, if an error is returned it will cause a SIGBUS */
199 int (*page_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
201 /* called by access_process_vm when get_user_pages() fails, typically
202 * for use by special VMAs that can switch between memory and hardware
204 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
205 void *buf
, int len
, int write
);
208 * set_policy() op must add a reference to any non-NULL @new mempolicy
209 * to hold the policy upon return. Caller should pass NULL @new to
210 * remove a policy and fall back to surrounding context--i.e. do not
211 * install a MPOL_DEFAULT policy, nor the task or system default
214 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
217 * get_policy() op must add reference [mpol_get()] to any policy at
218 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
219 * in mm/mempolicy.c will do this automatically.
220 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
221 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
222 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
223 * must return NULL--i.e., do not "fallback" to task or system default
226 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
228 int (*migrate
)(struct vm_area_struct
*vma
, const nodemask_t
*from
,
229 const nodemask_t
*to
, unsigned long flags
);
231 /* called by sys_remap_file_pages() to populate non-linear mapping */
232 int (*remap_pages
)(struct vm_area_struct
*vma
, unsigned long addr
,
233 unsigned long size
, pgoff_t pgoff
);
239 #define page_private(page) ((page)->private)
240 #define set_page_private(page, v) ((page)->private = (v))
242 /* It's valid only if the page is free path or free_list */
243 static inline void set_freepage_migratetype(struct page
*page
, int migratetype
)
245 page
->index
= migratetype
;
248 /* It's valid only if the page is free path or free_list */
249 static inline int get_freepage_migratetype(struct page
*page
)
255 * FIXME: take this include out, include page-flags.h in
256 * files which need it (119 of them)
258 #include <linux/page-flags.h>
259 #include <linux/huge_mm.h>
262 * Methods to modify the page usage count.
264 * What counts for a page usage:
265 * - cache mapping (page->mapping)
266 * - private data (page->private)
267 * - page mapped in a task's page tables, each mapping
268 * is counted separately
270 * Also, many kernel routines increase the page count before a critical
271 * routine so they can be sure the page doesn't go away from under them.
275 * Drop a ref, return true if the refcount fell to zero (the page has no users)
277 static inline int put_page_testzero(struct page
*page
)
279 VM_BUG_ON(atomic_read(&page
->_count
) == 0);
280 return atomic_dec_and_test(&page
->_count
);
284 * Try to grab a ref unless the page has a refcount of zero, return false if
287 static inline int get_page_unless_zero(struct page
*page
)
289 return atomic_inc_not_zero(&page
->_count
);
292 extern int page_is_ram(unsigned long pfn
);
294 /* Support for virtually mapped pages */
295 struct page
*vmalloc_to_page(const void *addr
);
296 unsigned long vmalloc_to_pfn(const void *addr
);
299 * Determine if an address is within the vmalloc range
301 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
302 * is no special casing required.
304 static inline int is_vmalloc_addr(const void *x
)
307 unsigned long addr
= (unsigned long)x
;
309 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
315 extern int is_vmalloc_or_module_addr(const void *x
);
317 static inline int is_vmalloc_or_module_addr(const void *x
)
323 static inline void compound_lock(struct page
*page
)
325 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
326 VM_BUG_ON(PageSlab(page
));
327 bit_spin_lock(PG_compound_lock
, &page
->flags
);
331 static inline void compound_unlock(struct page
*page
)
333 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
334 VM_BUG_ON(PageSlab(page
));
335 bit_spin_unlock(PG_compound_lock
, &page
->flags
);
339 static inline unsigned long compound_lock_irqsave(struct page
*page
)
341 unsigned long uninitialized_var(flags
);
342 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
343 local_irq_save(flags
);
349 static inline void compound_unlock_irqrestore(struct page
*page
,
352 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
353 compound_unlock(page
);
354 local_irq_restore(flags
);
358 static inline struct page
*compound_head(struct page
*page
)
360 if (unlikely(PageTail(page
)))
361 return page
->first_page
;
366 * The atomic page->_mapcount, starts from -1: so that transitions
367 * both from it and to it can be tracked, using atomic_inc_and_test
368 * and atomic_add_negative(-1).
370 static inline void page_mapcount_reset(struct page
*page
)
372 atomic_set(&(page
)->_mapcount
, -1);
375 static inline int page_mapcount(struct page
*page
)
377 return atomic_read(&(page
)->_mapcount
) + 1;
380 static inline int page_count(struct page
*page
)
382 return atomic_read(&compound_head(page
)->_count
);
385 static inline void get_huge_page_tail(struct page
*page
)
388 * __split_huge_page_refcount() cannot run
391 VM_BUG_ON(page_mapcount(page
) < 0);
392 VM_BUG_ON(atomic_read(&page
->_count
) != 0);
393 atomic_inc(&page
->_mapcount
);
396 extern bool __get_page_tail(struct page
*page
);
398 static inline void get_page(struct page
*page
)
400 if (unlikely(PageTail(page
)))
401 if (likely(__get_page_tail(page
)))
404 * Getting a normal page or the head of a compound page
405 * requires to already have an elevated page->_count.
407 VM_BUG_ON(atomic_read(&page
->_count
) <= 0);
408 atomic_inc(&page
->_count
);
411 static inline struct page
*virt_to_head_page(const void *x
)
413 struct page
*page
= virt_to_page(x
);
414 return compound_head(page
);
418 * Setup the page count before being freed into the page allocator for
419 * the first time (boot or memory hotplug)
421 static inline void init_page_count(struct page
*page
)
423 atomic_set(&page
->_count
, 1);
427 * PageBuddy() indicate that the page is free and in the buddy system
428 * (see mm/page_alloc.c).
430 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
431 * -2 so that an underflow of the page_mapcount() won't be mistaken
432 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
433 * efficiently by most CPU architectures.
435 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
437 static inline int PageBuddy(struct page
*page
)
439 return atomic_read(&page
->_mapcount
) == PAGE_BUDDY_MAPCOUNT_VALUE
;
442 static inline void __SetPageBuddy(struct page
*page
)
444 VM_BUG_ON(atomic_read(&page
->_mapcount
) != -1);
445 atomic_set(&page
->_mapcount
, PAGE_BUDDY_MAPCOUNT_VALUE
);
448 static inline void __ClearPageBuddy(struct page
*page
)
450 VM_BUG_ON(!PageBuddy(page
));
451 atomic_set(&page
->_mapcount
, -1);
454 void put_page(struct page
*page
);
455 void put_pages_list(struct list_head
*pages
);
457 void split_page(struct page
*page
, unsigned int order
);
458 int split_free_page(struct page
*page
);
461 * Compound pages have a destructor function. Provide a
462 * prototype for that function and accessor functions.
463 * These are _only_ valid on the head of a PG_compound page.
465 typedef void compound_page_dtor(struct page
*);
467 static inline void set_compound_page_dtor(struct page
*page
,
468 compound_page_dtor
*dtor
)
470 page
[1].lru
.next
= (void *)dtor
;
473 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
475 return (compound_page_dtor
*)page
[1].lru
.next
;
478 static inline int compound_order(struct page
*page
)
482 return (unsigned long)page
[1].lru
.prev
;
485 static inline int compound_trans_order(struct page
*page
)
493 flags
= compound_lock_irqsave(page
);
494 order
= compound_order(page
);
495 compound_unlock_irqrestore(page
, flags
);
499 static inline void set_compound_order(struct page
*page
, unsigned long order
)
501 page
[1].lru
.prev
= (void *)order
;
506 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
507 * servicing faults for write access. In the normal case, do always want
508 * pte_mkwrite. But get_user_pages can cause write faults for mappings
509 * that do not have writing enabled, when used by access_process_vm.
511 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
513 if (likely(vma
->vm_flags
& VM_WRITE
))
514 pte
= pte_mkwrite(pte
);
520 * Multiple processes may "see" the same page. E.g. for untouched
521 * mappings of /dev/null, all processes see the same page full of
522 * zeroes, and text pages of executables and shared libraries have
523 * only one copy in memory, at most, normally.
525 * For the non-reserved pages, page_count(page) denotes a reference count.
526 * page_count() == 0 means the page is free. page->lru is then used for
527 * freelist management in the buddy allocator.
528 * page_count() > 0 means the page has been allocated.
530 * Pages are allocated by the slab allocator in order to provide memory
531 * to kmalloc and kmem_cache_alloc. In this case, the management of the
532 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
533 * unless a particular usage is carefully commented. (the responsibility of
534 * freeing the kmalloc memory is the caller's, of course).
536 * A page may be used by anyone else who does a __get_free_page().
537 * In this case, page_count still tracks the references, and should only
538 * be used through the normal accessor functions. The top bits of page->flags
539 * and page->virtual store page management information, but all other fields
540 * are unused and could be used privately, carefully. The management of this
541 * page is the responsibility of the one who allocated it, and those who have
542 * subsequently been given references to it.
544 * The other pages (we may call them "pagecache pages") are completely
545 * managed by the Linux memory manager: I/O, buffers, swapping etc.
546 * The following discussion applies only to them.
548 * A pagecache page contains an opaque `private' member, which belongs to the
549 * page's address_space. Usually, this is the address of a circular list of
550 * the page's disk buffers. PG_private must be set to tell the VM to call
551 * into the filesystem to release these pages.
553 * A page may belong to an inode's memory mapping. In this case, page->mapping
554 * is the pointer to the inode, and page->index is the file offset of the page,
555 * in units of PAGE_CACHE_SIZE.
557 * If pagecache pages are not associated with an inode, they are said to be
558 * anonymous pages. These may become associated with the swapcache, and in that
559 * case PG_swapcache is set, and page->private is an offset into the swapcache.
561 * In either case (swapcache or inode backed), the pagecache itself holds one
562 * reference to the page. Setting PG_private should also increment the
563 * refcount. The each user mapping also has a reference to the page.
565 * The pagecache pages are stored in a per-mapping radix tree, which is
566 * rooted at mapping->page_tree, and indexed by offset.
567 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
568 * lists, we instead now tag pages as dirty/writeback in the radix tree.
570 * All pagecache pages may be subject to I/O:
571 * - inode pages may need to be read from disk,
572 * - inode pages which have been modified and are MAP_SHARED may need
573 * to be written back to the inode on disk,
574 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
575 * modified may need to be swapped out to swap space and (later) to be read
580 * The zone field is never updated after free_area_init_core()
581 * sets it, so none of the operations on it need to be atomic.
584 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_NID] | ... | FLAGS | */
585 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
586 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
587 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
588 #define LAST_NID_PGOFF (ZONES_PGOFF - LAST_NID_WIDTH)
591 * Define the bit shifts to access each section. For non-existent
592 * sections we define the shift as 0; that plus a 0 mask ensures
593 * the compiler will optimise away reference to them.
595 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
596 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
597 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
598 #define LAST_NID_PGSHIFT (LAST_NID_PGOFF * (LAST_NID_WIDTH != 0))
600 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
601 #ifdef NODE_NOT_IN_PAGE_FLAGS
602 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
603 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
604 SECTIONS_PGOFF : ZONES_PGOFF)
606 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
607 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
608 NODES_PGOFF : ZONES_PGOFF)
611 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
613 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
614 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
617 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
618 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
619 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
620 #define LAST_NID_MASK ((1UL << LAST_NID_WIDTH) - 1)
621 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
623 static inline enum zone_type
page_zonenum(const struct page
*page
)
625 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
628 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
629 #define SECTION_IN_PAGE_FLAGS
633 * The identification function is only used by the buddy allocator for
634 * determining if two pages could be buddies. We are not really
635 * identifying a zone since we could be using a the section number
636 * id if we have not node id available in page flags.
637 * We guarantee only that it will return the same value for two
638 * combinable pages in a zone.
640 static inline int page_zone_id(struct page
*page
)
642 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
645 static inline int zone_to_nid(struct zone
*zone
)
654 #ifdef NODE_NOT_IN_PAGE_FLAGS
655 extern int page_to_nid(const struct page
*page
);
657 static inline int page_to_nid(const struct page
*page
)
659 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
663 #ifdef CONFIG_NUMA_BALANCING
664 #ifdef LAST_NID_NOT_IN_PAGE_FLAGS
665 static inline int page_nid_xchg_last(struct page
*page
, int nid
)
667 return xchg(&page
->_last_nid
, nid
);
670 static inline int page_nid_last(struct page
*page
)
672 return page
->_last_nid
;
674 static inline void page_nid_reset_last(struct page
*page
)
676 page
->_last_nid
= -1;
679 static inline int page_nid_last(struct page
*page
)
681 return (page
->flags
>> LAST_NID_PGSHIFT
) & LAST_NID_MASK
;
684 extern int page_nid_xchg_last(struct page
*page
, int nid
);
686 static inline void page_nid_reset_last(struct page
*page
)
688 int nid
= (1 << LAST_NID_SHIFT
) - 1;
690 page
->flags
&= ~(LAST_NID_MASK
<< LAST_NID_PGSHIFT
);
691 page
->flags
|= (nid
& LAST_NID_MASK
) << LAST_NID_PGSHIFT
;
693 #endif /* LAST_NID_NOT_IN_PAGE_FLAGS */
695 static inline int page_nid_xchg_last(struct page
*page
, int nid
)
697 return page_to_nid(page
);
700 static inline int page_nid_last(struct page
*page
)
702 return page_to_nid(page
);
705 static inline void page_nid_reset_last(struct page
*page
)
710 static inline struct zone
*page_zone(const struct page
*page
)
712 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
715 #ifdef SECTION_IN_PAGE_FLAGS
716 static inline void set_page_section(struct page
*page
, unsigned long section
)
718 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
719 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
722 static inline unsigned long page_to_section(const struct page
*page
)
724 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
728 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
730 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
731 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
734 static inline void set_page_node(struct page
*page
, unsigned long node
)
736 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
737 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
740 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
741 unsigned long node
, unsigned long pfn
)
743 set_page_zone(page
, zone
);
744 set_page_node(page
, node
);
745 #ifdef SECTION_IN_PAGE_FLAGS
746 set_page_section(page
, pfn_to_section_nr(pfn
));
751 * Some inline functions in vmstat.h depend on page_zone()
753 #include <linux/vmstat.h>
755 static __always_inline
void *lowmem_page_address(const struct page
*page
)
757 return __va(PFN_PHYS(page_to_pfn(page
)));
760 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
761 #define HASHED_PAGE_VIRTUAL
764 #if defined(WANT_PAGE_VIRTUAL)
765 #define page_address(page) ((page)->virtual)
766 #define set_page_address(page, address) \
768 (page)->virtual = (address); \
770 #define page_address_init() do { } while(0)
773 #if defined(HASHED_PAGE_VIRTUAL)
774 void *page_address(const struct page
*page
);
775 void set_page_address(struct page
*page
, void *virtual);
776 void page_address_init(void);
779 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
780 #define page_address(page) lowmem_page_address(page)
781 #define set_page_address(page, address) do { } while(0)
782 #define page_address_init() do { } while(0)
786 * On an anonymous page mapped into a user virtual memory area,
787 * page->mapping points to its anon_vma, not to a struct address_space;
788 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
790 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
791 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
792 * and then page->mapping points, not to an anon_vma, but to a private
793 * structure which KSM associates with that merged page. See ksm.h.
795 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
797 * Please note that, confusingly, "page_mapping" refers to the inode
798 * address_space which maps the page from disk; whereas "page_mapped"
799 * refers to user virtual address space into which the page is mapped.
801 #define PAGE_MAPPING_ANON 1
802 #define PAGE_MAPPING_KSM 2
803 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
805 extern struct address_space
*page_mapping(struct page
*page
);
807 /* Neutral page->mapping pointer to address_space or anon_vma or other */
808 static inline void *page_rmapping(struct page
*page
)
810 return (void *)((unsigned long)page
->mapping
& ~PAGE_MAPPING_FLAGS
);
813 extern struct address_space
*__page_file_mapping(struct page
*);
816 struct address_space
*page_file_mapping(struct page
*page
)
818 if (unlikely(PageSwapCache(page
)))
819 return __page_file_mapping(page
);
821 return page
->mapping
;
824 static inline int PageAnon(struct page
*page
)
826 return ((unsigned long)page
->mapping
& PAGE_MAPPING_ANON
) != 0;
830 * Return the pagecache index of the passed page. Regular pagecache pages
831 * use ->index whereas swapcache pages use ->private
833 static inline pgoff_t
page_index(struct page
*page
)
835 if (unlikely(PageSwapCache(page
)))
836 return page_private(page
);
840 extern pgoff_t
__page_file_index(struct page
*page
);
843 * Return the file index of the page. Regular pagecache pages use ->index
844 * whereas swapcache pages use swp_offset(->private)
846 static inline pgoff_t
page_file_index(struct page
*page
)
848 if (unlikely(PageSwapCache(page
)))
849 return __page_file_index(page
);
855 * Return true if this page is mapped into pagetables.
857 static inline int page_mapped(struct page
*page
)
859 return atomic_read(&(page
)->_mapcount
) >= 0;
863 * Different kinds of faults, as returned by handle_mm_fault().
864 * Used to decide whether a process gets delivered SIGBUS or
865 * just gets major/minor fault counters bumped up.
868 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
870 #define VM_FAULT_OOM 0x0001
871 #define VM_FAULT_SIGBUS 0x0002
872 #define VM_FAULT_MAJOR 0x0004
873 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
874 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
875 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
877 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
878 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
879 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
881 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
883 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
884 VM_FAULT_HWPOISON_LARGE)
886 /* Encode hstate index for a hwpoisoned large page */
887 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
888 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
891 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
893 extern void pagefault_out_of_memory(void);
895 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
898 * Flags passed to show_mem() and show_free_areas() to suppress output in
901 #define SHOW_MEM_FILTER_NODES (0x0001u) /* filter disallowed nodes */
903 extern void show_free_areas(unsigned int flags
);
904 extern bool skip_free_areas_node(unsigned int flags
, int nid
);
906 int shmem_zero_setup(struct vm_area_struct
*);
908 extern int can_do_mlock(void);
909 extern int user_shm_lock(size_t, struct user_struct
*);
910 extern void user_shm_unlock(size_t, struct user_struct
*);
913 * Parameter block passed down to zap_pte_range in exceptional cases.
916 struct vm_area_struct
*nonlinear_vma
; /* Check page->index if set */
917 struct address_space
*check_mapping
; /* Check page->mapping if set */
918 pgoff_t first_index
; /* Lowest page->index to unmap */
919 pgoff_t last_index
; /* Highest page->index to unmap */
922 struct page
*vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
925 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
927 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
928 unsigned long size
, struct zap_details
*);
929 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
930 unsigned long start
, unsigned long end
);
933 * mm_walk - callbacks for walk_page_range
934 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
935 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
936 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
937 * this handler is required to be able to handle
938 * pmd_trans_huge() pmds. They may simply choose to
939 * split_huge_page() instead of handling it explicitly.
940 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
941 * @pte_hole: if set, called for each hole at all levels
942 * @hugetlb_entry: if set, called for each hugetlb entry
943 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
946 * (see walk_page_range for more details)
949 int (*pgd_entry
)(pgd_t
*, unsigned long, unsigned long, struct mm_walk
*);
950 int (*pud_entry
)(pud_t
*, unsigned long, unsigned long, struct mm_walk
*);
951 int (*pmd_entry
)(pmd_t
*, unsigned long, unsigned long, struct mm_walk
*);
952 int (*pte_entry
)(pte_t
*, unsigned long, unsigned long, struct mm_walk
*);
953 int (*pte_hole
)(unsigned long, unsigned long, struct mm_walk
*);
954 int (*hugetlb_entry
)(pte_t
*, unsigned long,
955 unsigned long, unsigned long, struct mm_walk
*);
956 struct mm_struct
*mm
;
960 int walk_page_range(unsigned long addr
, unsigned long end
,
961 struct mm_walk
*walk
);
962 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
963 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
964 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
965 struct vm_area_struct
*vma
);
966 void unmap_mapping_range(struct address_space
*mapping
,
967 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
968 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
970 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
971 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
972 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
973 void *buf
, int len
, int write
);
975 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
976 loff_t
const holebegin
, loff_t
const holelen
)
978 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
981 extern void truncate_pagecache(struct inode
*inode
, loff_t old
, loff_t
new);
982 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
983 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
984 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
985 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
986 int invalidate_inode_page(struct page
*page
);
989 extern int handle_mm_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
990 unsigned long address
, unsigned int flags
);
991 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
992 unsigned long address
, unsigned int fault_flags
);
994 static inline int handle_mm_fault(struct mm_struct
*mm
,
995 struct vm_area_struct
*vma
, unsigned long address
,
998 /* should never happen if there's no MMU */
1000 return VM_FAULT_SIGBUS
;
1002 static inline int fixup_user_fault(struct task_struct
*tsk
,
1003 struct mm_struct
*mm
, unsigned long address
,
1004 unsigned int fault_flags
)
1006 /* should never happen if there's no MMU */
1012 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
1013 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1014 void *buf
, int len
, int write
);
1016 long __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1017 unsigned long start
, unsigned long nr_pages
,
1018 unsigned int foll_flags
, struct page
**pages
,
1019 struct vm_area_struct
**vmas
, int *nonblocking
);
1020 long get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1021 unsigned long start
, unsigned long nr_pages
,
1022 int write
, int force
, struct page
**pages
,
1023 struct vm_area_struct
**vmas
);
1024 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1025 struct page
**pages
);
1027 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1028 struct page
**pages
);
1029 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1030 struct page
*get_dump_page(unsigned long addr
);
1032 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1033 extern void do_invalidatepage(struct page
*page
, unsigned long offset
);
1035 int __set_page_dirty_nobuffers(struct page
*page
);
1036 int __set_page_dirty_no_writeback(struct page
*page
);
1037 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1039 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1040 void account_page_writeback(struct page
*page
);
1041 int set_page_dirty(struct page
*page
);
1042 int set_page_dirty_lock(struct page
*page
);
1043 int clear_page_dirty_for_io(struct page
*page
);
1045 /* Is the vma a continuation of the stack vma above it? */
1046 static inline int vma_growsdown(struct vm_area_struct
*vma
, unsigned long addr
)
1048 return vma
&& (vma
->vm_end
== addr
) && (vma
->vm_flags
& VM_GROWSDOWN
);
1051 static inline int stack_guard_page_start(struct vm_area_struct
*vma
,
1054 return (vma
->vm_flags
& VM_GROWSDOWN
) &&
1055 (vma
->vm_start
== addr
) &&
1056 !vma_growsdown(vma
->vm_prev
, addr
);
1059 /* Is the vma a continuation of the stack vma below it? */
1060 static inline int vma_growsup(struct vm_area_struct
*vma
, unsigned long addr
)
1062 return vma
&& (vma
->vm_start
== addr
) && (vma
->vm_flags
& VM_GROWSUP
);
1065 static inline int stack_guard_page_end(struct vm_area_struct
*vma
,
1068 return (vma
->vm_flags
& VM_GROWSUP
) &&
1069 (vma
->vm_end
== addr
) &&
1070 !vma_growsup(vma
->vm_next
, addr
);
1074 vm_is_stack(struct task_struct
*task
, struct vm_area_struct
*vma
, int in_group
);
1076 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1077 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1078 unsigned long new_addr
, unsigned long len
,
1079 bool need_rmap_locks
);
1080 extern unsigned long do_mremap(unsigned long addr
,
1081 unsigned long old_len
, unsigned long new_len
,
1082 unsigned long flags
, unsigned long new_addr
);
1083 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1084 unsigned long end
, pgprot_t newprot
,
1085 int dirty_accountable
, int prot_numa
);
1086 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1087 struct vm_area_struct
**pprev
, unsigned long start
,
1088 unsigned long end
, unsigned long newflags
);
1091 * doesn't attempt to fault and will return short.
1093 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1094 struct page
**pages
);
1096 * per-process(per-mm_struct) statistics.
1098 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1100 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1102 #ifdef SPLIT_RSS_COUNTING
1104 * counter is updated in asynchronous manner and may go to minus.
1105 * But it's never be expected number for users.
1110 return (unsigned long)val
;
1113 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1115 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1118 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1120 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1123 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1125 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1128 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1130 return get_mm_counter(mm
, MM_FILEPAGES
) +
1131 get_mm_counter(mm
, MM_ANONPAGES
);
1134 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1136 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1139 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1141 return max(mm
->hiwater_vm
, mm
->total_vm
);
1144 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1146 unsigned long _rss
= get_mm_rss(mm
);
1148 if ((mm
)->hiwater_rss
< _rss
)
1149 (mm
)->hiwater_rss
= _rss
;
1152 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1154 if (mm
->hiwater_vm
< mm
->total_vm
)
1155 mm
->hiwater_vm
= mm
->total_vm
;
1158 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1159 struct mm_struct
*mm
)
1161 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1163 if (*maxrss
< hiwater_rss
)
1164 *maxrss
= hiwater_rss
;
1167 #if defined(SPLIT_RSS_COUNTING)
1168 void sync_mm_rss(struct mm_struct
*mm
);
1170 static inline void sync_mm_rss(struct mm_struct
*mm
)
1175 int vma_wants_writenotify(struct vm_area_struct
*vma
);
1177 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1179 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1183 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1187 #ifdef __PAGETABLE_PUD_FOLDED
1188 static inline int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1189 unsigned long address
)
1194 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1197 #ifdef __PAGETABLE_PMD_FOLDED
1198 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1199 unsigned long address
)
1204 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1207 int __pte_alloc(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1208 pmd_t
*pmd
, unsigned long address
);
1209 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1212 * The following ifdef needed to get the 4level-fixup.h header to work.
1213 * Remove it when 4level-fixup.h has been removed.
1215 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1216 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
1218 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
1219 NULL
: pud_offset(pgd
, address
);
1222 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1224 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1225 NULL
: pmd_offset(pud
, address
);
1227 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1229 #if USE_SPLIT_PTLOCKS
1231 * We tuck a spinlock to guard each pagetable page into its struct page,
1232 * at page->private, with BUILD_BUG_ON to make sure that this will not
1233 * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
1234 * When freeing, reset page->mapping so free_pages_check won't complain.
1236 #define __pte_lockptr(page) &((page)->ptl)
1237 #define pte_lock_init(_page) do { \
1238 spin_lock_init(__pte_lockptr(_page)); \
1240 #define pte_lock_deinit(page) ((page)->mapping = NULL)
1241 #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
1242 #else /* !USE_SPLIT_PTLOCKS */
1244 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1246 #define pte_lock_init(page) do {} while (0)
1247 #define pte_lock_deinit(page) do {} while (0)
1248 #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
1249 #endif /* USE_SPLIT_PTLOCKS */
1251 static inline void pgtable_page_ctor(struct page
*page
)
1253 pte_lock_init(page
);
1254 inc_zone_page_state(page
, NR_PAGETABLE
);
1257 static inline void pgtable_page_dtor(struct page
*page
)
1259 pte_lock_deinit(page
);
1260 dec_zone_page_state(page
, NR_PAGETABLE
);
1263 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1265 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1266 pte_t *__pte = pte_offset_map(pmd, address); \
1272 #define pte_unmap_unlock(pte, ptl) do { \
1277 #define pte_alloc_map(mm, vma, pmd, address) \
1278 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1280 NULL: pte_offset_map(pmd, address))
1282 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1283 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1285 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1287 #define pte_alloc_kernel(pmd, address) \
1288 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1289 NULL: pte_offset_kernel(pmd, address))
1291 extern void free_area_init(unsigned long * zones_size
);
1292 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1293 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1294 extern void free_initmem(void);
1296 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1298 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1299 * zones, allocate the backing mem_map and account for memory holes in a more
1300 * architecture independent manner. This is a substitute for creating the
1301 * zone_sizes[] and zholes_size[] arrays and passing them to
1302 * free_area_init_node()
1304 * An architecture is expected to register range of page frames backed by
1305 * physical memory with memblock_add[_node]() before calling
1306 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1307 * usage, an architecture is expected to do something like
1309 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1311 * for_each_valid_physical_page_range()
1312 * memblock_add_node(base, size, nid)
1313 * free_area_init_nodes(max_zone_pfns);
1315 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1316 * registered physical page range. Similarly
1317 * sparse_memory_present_with_active_regions() calls memory_present() for
1318 * each range when SPARSEMEM is enabled.
1320 * See mm/page_alloc.c for more information on each function exposed by
1321 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1323 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1324 unsigned long node_map_pfn_alignment(void);
1325 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1326 unsigned long end_pfn
);
1327 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1328 unsigned long end_pfn
);
1329 extern void get_pfn_range_for_nid(unsigned int nid
,
1330 unsigned long *start_pfn
, unsigned long *end_pfn
);
1331 extern unsigned long find_min_pfn_with_active_regions(void);
1332 extern void free_bootmem_with_active_regions(int nid
,
1333 unsigned long max_low_pfn
);
1334 extern void sparse_memory_present_with_active_regions(int nid
);
1336 #define MOVABLEMEM_MAP_MAX MAX_NUMNODES
1337 struct movablemem_entry
{
1338 unsigned long start_pfn
; /* start pfn of memory segment */
1339 unsigned long end_pfn
; /* end pfn of memory segment (exclusive) */
1342 struct movablemem_map
{
1343 bool acpi
; /* true if using SRAT info */
1345 struct movablemem_entry map
[MOVABLEMEM_MAP_MAX
];
1346 nodemask_t numa_nodes_hotplug
; /* on which nodes we specify memory */
1347 nodemask_t numa_nodes_kernel
; /* on which nodes kernel resides in */
1350 extern void __init
insert_movablemem_map(unsigned long start_pfn
,
1351 unsigned long end_pfn
);
1352 extern int __init
movablemem_map_overlap(unsigned long start_pfn
,
1353 unsigned long end_pfn
);
1354 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1356 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1357 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1358 static inline int __early_pfn_to_nid(unsigned long pfn
)
1363 /* please see mm/page_alloc.c */
1364 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1365 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
1366 /* there is a per-arch backend function. */
1367 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
);
1368 #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
1371 extern void set_dma_reserve(unsigned long new_dma_reserve
);
1372 extern void memmap_init_zone(unsigned long, int, unsigned long,
1373 unsigned long, enum memmap_context
);
1374 extern void setup_per_zone_wmarks(void);
1375 extern int __meminit
init_per_zone_wmark_min(void);
1376 extern void mem_init(void);
1377 extern void __init
mmap_init(void);
1378 extern void show_mem(unsigned int flags
);
1379 extern void si_meminfo(struct sysinfo
* val
);
1380 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
1382 extern __printf(3, 4)
1383 void warn_alloc_failed(gfp_t gfp_mask
, int order
, const char *fmt
, ...);
1385 extern void setup_per_cpu_pageset(void);
1387 extern void zone_pcp_update(struct zone
*zone
);
1388 extern void zone_pcp_reset(struct zone
*zone
);
1391 extern int min_free_kbytes
;
1394 extern atomic_long_t mmap_pages_allocated
;
1395 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
1397 /* interval_tree.c */
1398 void vma_interval_tree_insert(struct vm_area_struct
*node
,
1399 struct rb_root
*root
);
1400 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
1401 struct vm_area_struct
*prev
,
1402 struct rb_root
*root
);
1403 void vma_interval_tree_remove(struct vm_area_struct
*node
,
1404 struct rb_root
*root
);
1405 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root
*root
,
1406 unsigned long start
, unsigned long last
);
1407 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
1408 unsigned long start
, unsigned long last
);
1410 #define vma_interval_tree_foreach(vma, root, start, last) \
1411 for (vma = vma_interval_tree_iter_first(root, start, last); \
1412 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1414 static inline void vma_nonlinear_insert(struct vm_area_struct
*vma
,
1415 struct list_head
*list
)
1417 list_add_tail(&vma
->shared
.nonlinear
, list
);
1420 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
1421 struct rb_root
*root
);
1422 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
1423 struct rb_root
*root
);
1424 struct anon_vma_chain
*anon_vma_interval_tree_iter_first(
1425 struct rb_root
*root
, unsigned long start
, unsigned long last
);
1426 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
1427 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
1428 #ifdef CONFIG_DEBUG_VM_RB
1429 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
1432 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1433 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1434 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1437 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
1438 extern int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
1439 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
1440 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
1441 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
1442 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
1443 struct mempolicy
*);
1444 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
1445 extern int split_vma(struct mm_struct
*,
1446 struct vm_area_struct
*, unsigned long addr
, int new_below
);
1447 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
1448 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
1449 struct rb_node
**, struct rb_node
*);
1450 extern void unlink_file_vma(struct vm_area_struct
*);
1451 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
1452 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
1453 bool *need_rmap_locks
);
1454 extern void exit_mmap(struct mm_struct
*);
1456 extern int mm_take_all_locks(struct mm_struct
*mm
);
1457 extern void mm_drop_all_locks(struct mm_struct
*mm
);
1459 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
1460 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
1462 extern int may_expand_vm(struct mm_struct
*mm
, unsigned long npages
);
1463 extern int install_special_mapping(struct mm_struct
*mm
,
1464 unsigned long addr
, unsigned long len
,
1465 unsigned long flags
, struct page
**pages
);
1467 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1469 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
1470 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
);
1471 extern unsigned long do_mmap_pgoff(struct file
*file
, unsigned long addr
,
1472 unsigned long len
, unsigned long prot
, unsigned long flags
,
1473 unsigned long pgoff
, unsigned long *populate
);
1474 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
1477 extern int __mm_populate(unsigned long addr
, unsigned long len
,
1479 static inline void mm_populate(unsigned long addr
, unsigned long len
)
1482 (void) __mm_populate(addr
, len
, 1);
1485 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
1488 /* These take the mm semaphore themselves */
1489 extern unsigned long vm_brk(unsigned long, unsigned long);
1490 extern int vm_munmap(unsigned long, size_t);
1491 extern unsigned long vm_mmap(struct file
*, unsigned long,
1492 unsigned long, unsigned long,
1493 unsigned long, unsigned long);
1495 struct vm_unmapped_area_info
{
1496 #define VM_UNMAPPED_AREA_TOPDOWN 1
1497 unsigned long flags
;
1498 unsigned long length
;
1499 unsigned long low_limit
;
1500 unsigned long high_limit
;
1501 unsigned long align_mask
;
1502 unsigned long align_offset
;
1505 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
1506 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
1509 * Search for an unmapped address range.
1511 * We are looking for a range that:
1512 * - does not intersect with any VMA;
1513 * - is contained within the [low_limit, high_limit) interval;
1514 * - is at least the desired size.
1515 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1517 static inline unsigned long
1518 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
1520 if (!(info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
))
1521 return unmapped_area(info
);
1523 return unmapped_area_topdown(info
);
1527 extern void truncate_inode_pages(struct address_space
*, loff_t
);
1528 extern void truncate_inode_pages_range(struct address_space
*,
1529 loff_t lstart
, loff_t lend
);
1531 /* generic vm_area_ops exported for stackable file systems */
1532 extern int filemap_fault(struct vm_area_struct
*, struct vm_fault
*);
1533 extern int filemap_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1535 /* mm/page-writeback.c */
1536 int write_one_page(struct page
*page
, int wait
);
1537 void task_dirty_inc(struct task_struct
*tsk
);
1540 #define VM_MAX_READAHEAD 128 /* kbytes */
1541 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1543 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
1544 pgoff_t offset
, unsigned long nr_to_read
);
1546 void page_cache_sync_readahead(struct address_space
*mapping
,
1547 struct file_ra_state
*ra
,
1550 unsigned long size
);
1552 void page_cache_async_readahead(struct address_space
*mapping
,
1553 struct file_ra_state
*ra
,
1557 unsigned long size
);
1559 unsigned long max_sane_readahead(unsigned long nr
);
1560 unsigned long ra_submit(struct file_ra_state
*ra
,
1561 struct address_space
*mapping
,
1564 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1565 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
1567 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1568 extern int expand_downwards(struct vm_area_struct
*vma
,
1569 unsigned long address
);
1571 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
1573 #define expand_upwards(vma, address) do { } while (0)
1576 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1577 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
1578 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
1579 struct vm_area_struct
**pprev
);
1581 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1582 NULL if none. Assume start_addr < end_addr. */
1583 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
1585 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
1587 if (vma
&& end_addr
<= vma
->vm_start
)
1592 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
1594 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
1597 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1598 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
1599 unsigned long vm_start
, unsigned long vm_end
)
1601 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
1603 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
1610 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
1612 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
1618 #ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
1619 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
1620 unsigned long start
, unsigned long end
);
1623 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
1624 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
1625 unsigned long pfn
, unsigned long size
, pgprot_t
);
1626 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
1627 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
1629 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
1632 struct page
*follow_page(struct vm_area_struct
*, unsigned long address
,
1633 unsigned int foll_flags
);
1634 #define FOLL_WRITE 0x01 /* check pte is writable */
1635 #define FOLL_TOUCH 0x02 /* mark page accessed */
1636 #define FOLL_GET 0x04 /* do get_page on page */
1637 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1638 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1639 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
1640 * and return without waiting upon it */
1641 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
1642 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
1643 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
1644 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
1646 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
1648 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
1649 unsigned long size
, pte_fn_t fn
, void *data
);
1651 #ifdef CONFIG_PROC_FS
1652 void vm_stat_account(struct mm_struct
*, unsigned long, struct file
*, long);
1654 static inline void vm_stat_account(struct mm_struct
*mm
,
1655 unsigned long flags
, struct file
*file
, long pages
)
1657 mm
->total_vm
+= pages
;
1659 #endif /* CONFIG_PROC_FS */
1661 #ifdef CONFIG_DEBUG_PAGEALLOC
1662 extern void kernel_map_pages(struct page
*page
, int numpages
, int enable
);
1663 #ifdef CONFIG_HIBERNATION
1664 extern bool kernel_page_present(struct page
*page
);
1665 #endif /* CONFIG_HIBERNATION */
1668 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
1669 #ifdef CONFIG_HIBERNATION
1670 static inline bool kernel_page_present(struct page
*page
) { return true; }
1671 #endif /* CONFIG_HIBERNATION */
1674 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
1675 #ifdef __HAVE_ARCH_GATE_AREA
1676 int in_gate_area_no_mm(unsigned long addr
);
1677 int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
1679 int in_gate_area_no_mm(unsigned long addr
);
1680 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
1681 #endif /* __HAVE_ARCH_GATE_AREA */
1683 int drop_caches_sysctl_handler(struct ctl_table
*, int,
1684 void __user
*, size_t *, loff_t
*);
1685 unsigned long shrink_slab(struct shrink_control
*shrink
,
1686 unsigned long nr_pages_scanned
,
1687 unsigned long lru_pages
);
1690 #define randomize_va_space 0
1692 extern int randomize_va_space
;
1695 const char * arch_vma_name(struct vm_area_struct
*vma
);
1696 void print_vma_addr(char *prefix
, unsigned long rip
);
1698 void sparse_mem_maps_populate_node(struct page
**map_map
,
1699 unsigned long pnum_begin
,
1700 unsigned long pnum_end
,
1701 unsigned long map_count
,
1704 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
1705 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
1706 pud_t
*vmemmap_pud_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
1707 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
1708 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
1709 void *vmemmap_alloc_block(unsigned long size
, int node
);
1710 void *vmemmap_alloc_block_buf(unsigned long size
, int node
);
1711 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
1712 int vmemmap_populate_basepages(struct page
*start_page
,
1713 unsigned long pages
, int node
);
1714 int vmemmap_populate(struct page
*start_page
, unsigned long pages
, int node
);
1715 void vmemmap_populate_print_last(void);
1716 #ifdef CONFIG_MEMORY_HOTPLUG
1717 void vmemmap_free(struct page
*memmap
, unsigned long nr_pages
);
1719 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
1720 unsigned long size
);
1723 MF_COUNT_INCREASED
= 1 << 0,
1724 MF_ACTION_REQUIRED
= 1 << 1,
1725 MF_MUST_KILL
= 1 << 2,
1727 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
1728 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
1729 extern int unpoison_memory(unsigned long pfn
);
1730 extern int sysctl_memory_failure_early_kill
;
1731 extern int sysctl_memory_failure_recovery
;
1732 extern void shake_page(struct page
*p
, int access
);
1733 extern atomic_long_t num_poisoned_pages
;
1734 extern int soft_offline_page(struct page
*page
, int flags
);
1736 extern void dump_page(struct page
*page
);
1738 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
1739 extern void clear_huge_page(struct page
*page
,
1741 unsigned int pages_per_huge_page
);
1742 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
1743 unsigned long addr
, struct vm_area_struct
*vma
,
1744 unsigned int pages_per_huge_page
);
1745 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
1747 #ifdef CONFIG_DEBUG_PAGEALLOC
1748 extern unsigned int _debug_guardpage_minorder
;
1750 static inline unsigned int debug_guardpage_minorder(void)
1752 return _debug_guardpage_minorder
;
1755 static inline bool page_is_guard(struct page
*page
)
1757 return test_bit(PAGE_DEBUG_FLAG_GUARD
, &page
->debug_flags
);
1760 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
1761 static inline bool page_is_guard(struct page
*page
) { return false; }
1762 #endif /* CONFIG_DEBUG_PAGEALLOC */
1764 #endif /* __KERNEL__ */
1765 #endif /* _LINUX_MM_H */