4
#include <linux/errno.h>
9
#include <linux/list.h>
10
#include <linux/mmzone.h>
11
#include <linux/rbtree.h>
12
#include <linux/prio_tree.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>
25
struct writeback_control;
27
#ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
28
extern unsigned long max_mapnr;
31
extern unsigned long num_physpages;
32
extern unsigned long totalram_pages;
33
extern void * high_memory;
34
extern int page_cluster;
37
extern int sysctl_legacy_va_layout;
39
#define sysctl_legacy_va_layout 0
43
#include <asm/pgtable.h>
44
#include <asm/processor.h>
46
#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
48
/* to align the pointer to the (next) page boundary */
49
#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
52
* Linux kernel virtual memory manager primitives.
53
* The idea being to have a "virtual" mm in the same way
54
* we have a virtual fs - giving a cleaner interface to the
55
* mm details, and allowing different kinds of memory mappings
56
* (from shared memory to executable loading to arbitrary
60
extern struct kmem_cache *vm_area_cachep;
63
extern struct rb_root nommu_region_tree;
64
extern struct rw_semaphore nommu_region_sem;
66
extern unsigned int kobjsize(const void *objp);
70
* vm_flags in vm_area_struct, see mm_types.h.
72
#define VM_READ 0x00000001 /* currently active flags */
73
#define VM_WRITE 0x00000002
74
#define VM_EXEC 0x00000004
75
#define VM_SHARED 0x00000008
77
/* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
78
#define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
79
#define VM_MAYWRITE 0x00000020
80
#define VM_MAYEXEC 0x00000040
81
#define VM_MAYSHARE 0x00000080
83
#define VM_GROWSDOWN 0x00000100 /* general info on the segment */
84
#if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64)
85
#define VM_GROWSUP 0x00000200
87
#define VM_GROWSUP 0x00000000
88
#define VM_NOHUGEPAGE 0x00000200 /* MADV_NOHUGEPAGE marked this vma */
90
#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
91
#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
93
#define VM_EXECUTABLE 0x00001000
94
#define VM_LOCKED 0x00002000
95
#define VM_IO 0x00004000 /* Memory mapped I/O or similar */
97
/* Used by sys_madvise() */
98
#define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
99
#define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
101
#define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
102
#define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
103
#define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */
104
#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
105
#define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
106
#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
107
#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
108
#ifndef CONFIG_TRANSPARENT_HUGEPAGE
109
#define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
111
#define VM_HUGEPAGE 0x01000000 /* MADV_HUGEPAGE marked this vma */
113
#define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */
114
#define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */
116
#define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */
117
#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
118
#define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */
119
#define VM_PFN_AT_MMAP 0x40000000 /* PFNMAP vma that is fully mapped at mmap time */
120
#define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
122
/* Bits set in the VMA until the stack is in its final location */
123
#define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
125
#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
126
#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
129
#ifdef CONFIG_STACK_GROWSUP
130
#define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
132
#define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
135
#define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
136
#define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
137
#define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
138
#define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
139
#define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
142
* Special vmas that are non-mergable, non-mlock()able.
143
* Note: mm/huge_memory.c VM_NO_THP depends on this definition.
145
#define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP)
148
* mapping from the currently active vm_flags protection bits (the
149
* low four bits) to a page protection mask..
151
extern pgprot_t protection_map[16];
153
#define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
154
#define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
155
#define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
156
#define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */
157
#define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */
158
#define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */
161
* This interface is used by x86 PAT code to identify a pfn mapping that is
162
* linear over entire vma. This is to optimize PAT code that deals with
163
* marking the physical region with a particular prot. This is not for generic
164
* mm use. Note also that this check will not work if the pfn mapping is
165
* linear for a vma starting at physical address 0. In which case PAT code
166
* falls back to slow path of reserving physical range page by page.
168
static inline int is_linear_pfn_mapping(struct vm_area_struct *vma)
170
return !!(vma->vm_flags & VM_PFN_AT_MMAP);
173
static inline int is_pfn_mapping(struct vm_area_struct *vma)
175
return !!(vma->vm_flags & VM_PFNMAP);
179
* vm_fault is filled by the the pagefault handler and passed to the vma's
180
* ->fault function. The vma's ->fault is responsible for returning a bitmask
181
* of VM_FAULT_xxx flags that give details about how the fault was handled.
183
* pgoff should be used in favour of virtual_address, if possible. If pgoff
184
* is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear
188
unsigned int flags; /* FAULT_FLAG_xxx flags */
189
pgoff_t pgoff; /* Logical page offset based on vma */
190
void __user *virtual_address; /* Faulting virtual address */
192
struct page *page; /* ->fault handlers should return a
193
* page here, unless VM_FAULT_NOPAGE
194
* is set (which is also implied by
200
* These are the virtual MM functions - opening of an area, closing and
201
* unmapping it (needed to keep files on disk up-to-date etc), pointer
202
* to the functions called when a no-page or a wp-page exception occurs.
204
struct vm_operations_struct {
205
void (*open)(struct vm_area_struct * area);
206
void (*close)(struct vm_area_struct * area);
207
int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
209
/* notification that a previously read-only page is about to become
210
* writable, if an error is returned it will cause a SIGBUS */
211
int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
213
/* called by access_process_vm when get_user_pages() fails, typically
214
* for use by special VMAs that can switch between memory and hardware
216
int (*access)(struct vm_area_struct *vma, unsigned long addr,
217
void *buf, int len, int write);
220
* set_policy() op must add a reference to any non-NULL @new mempolicy
221
* to hold the policy upon return. Caller should pass NULL @new to
222
* remove a policy and fall back to surrounding context--i.e. do not
223
* install a MPOL_DEFAULT policy, nor the task or system default
226
int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
229
* get_policy() op must add reference [mpol_get()] to any policy at
230
* (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
231
* in mm/mempolicy.c will do this automatically.
232
* get_policy() must NOT add a ref if the policy at (vma,addr) is not
233
* marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
234
* If no [shared/vma] mempolicy exists at the addr, get_policy() op
235
* must return NULL--i.e., do not "fallback" to task or system default
238
struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
240
int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,
241
const nodemask_t *to, unsigned long flags);
248
#define page_private(page) ((page)->private)
249
#define set_page_private(page, v) ((page)->private = (v))
252
* FIXME: take this include out, include page-flags.h in
253
* files which need it (119 of them)
255
#include <linux/page-flags.h>
256
#include <linux/huge_mm.h>
259
* Methods to modify the page usage count.
261
* What counts for a page usage:
262
* - cache mapping (page->mapping)
263
* - private data (page->private)
264
* - page mapped in a task's page tables, each mapping
265
* is counted separately
267
* Also, many kernel routines increase the page count before a critical
268
* routine so they can be sure the page doesn't go away from under them.
272
* Drop a ref, return true if the refcount fell to zero (the page has no users)
274
static inline int put_page_testzero(struct page *page)
276
VM_BUG_ON(atomic_read(&page->_count) == 0);
277
return atomic_dec_and_test(&page->_count);
281
* Try to grab a ref unless the page has a refcount of zero, return false if
284
static inline int get_page_unless_zero(struct page *page)
286
return atomic_inc_not_zero(&page->_count);
289
extern int page_is_ram(unsigned long pfn);
291
/* Support for virtually mapped pages */
292
struct page *vmalloc_to_page(const void *addr);
293
unsigned long vmalloc_to_pfn(const void *addr);
296
* Determine if an address is within the vmalloc range
298
* On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
299
* is no special casing required.
301
static inline int is_vmalloc_addr(const void *x)
304
unsigned long addr = (unsigned long)x;
306
return addr >= VMALLOC_START && addr < VMALLOC_END;
312
extern int is_vmalloc_or_module_addr(const void *x);
314
static inline int is_vmalloc_or_module_addr(const void *x)
320
static inline void compound_lock(struct page *page)
322
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
323
bit_spin_lock(PG_compound_lock, &page->flags);
327
static inline void compound_unlock(struct page *page)
329
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
330
bit_spin_unlock(PG_compound_lock, &page->flags);
334
static inline unsigned long compound_lock_irqsave(struct page *page)
336
unsigned long uninitialized_var(flags);
337
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
338
local_irq_save(flags);
344
static inline void compound_unlock_irqrestore(struct page *page,
347
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
348
compound_unlock(page);
349
local_irq_restore(flags);
353
static inline struct page *compound_head(struct page *page)
355
if (unlikely(PageTail(page)))
356
return page->first_page;
361
* The atomic page->_mapcount, starts from -1: so that transitions
362
* both from it and to it can be tracked, using atomic_inc_and_test
363
* and atomic_add_negative(-1).
365
static inline void reset_page_mapcount(struct page *page)
367
atomic_set(&(page)->_mapcount, -1);
370
static inline int page_mapcount(struct page *page)
372
return atomic_read(&(page)->_mapcount) + 1;
375
static inline int page_count(struct page *page)
377
return atomic_read(&compound_head(page)->_count);
380
static inline void get_huge_page_tail(struct page *page)
383
* __split_huge_page_refcount() cannot run
386
VM_BUG_ON(page_mapcount(page) < 0);
387
VM_BUG_ON(atomic_read(&page->_count) != 0);
388
atomic_inc(&page->_mapcount);
391
extern bool __get_page_tail(struct page *page);
393
static inline void get_page(struct page *page)
395
if (unlikely(PageTail(page)))
396
if (likely(__get_page_tail(page)))
399
* Getting a normal page or the head of a compound page
400
* requires to already have an elevated page->_count.
402
VM_BUG_ON(atomic_read(&page->_count) <= 0);
403
atomic_inc(&page->_count);
406
static inline struct page *virt_to_head_page(const void *x)
408
struct page *page = virt_to_page(x);
409
return compound_head(page);
413
* Setup the page count before being freed into the page allocator for
414
* the first time (boot or memory hotplug)
416
static inline void init_page_count(struct page *page)
418
atomic_set(&page->_count, 1);
422
* PageBuddy() indicate that the page is free and in the buddy system
423
* (see mm/page_alloc.c).
425
* PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
426
* -2 so that an underflow of the page_mapcount() won't be mistaken
427
* for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
428
* efficiently by most CPU architectures.
430
#define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
432
static inline int PageBuddy(struct page *page)
434
return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE;
437
static inline void __SetPageBuddy(struct page *page)
439
VM_BUG_ON(atomic_read(&page->_mapcount) != -1);
440
atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE);
443
static inline void __ClearPageBuddy(struct page *page)
445
VM_BUG_ON(!PageBuddy(page));
446
atomic_set(&page->_mapcount, -1);
449
void put_page(struct page *page);
450
void put_pages_list(struct list_head *pages);
452
void split_page(struct page *page, unsigned int order);
453
int split_free_page(struct page *page);
456
* Compound pages have a destructor function. Provide a
457
* prototype for that function and accessor functions.
458
* These are _only_ valid on the head of a PG_compound page.
460
typedef void compound_page_dtor(struct page *);
462
static inline void set_compound_page_dtor(struct page *page,
463
compound_page_dtor *dtor)
465
page[1].lru.next = (void *)dtor;
468
static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
470
return (compound_page_dtor *)page[1].lru.next;
473
static inline int compound_order(struct page *page)
477
return (unsigned long)page[1].lru.prev;
480
static inline int compound_trans_order(struct page *page)
488
flags = compound_lock_irqsave(page);
489
order = compound_order(page);
490
compound_unlock_irqrestore(page, flags);
494
static inline void set_compound_order(struct page *page, unsigned long order)
496
page[1].lru.prev = (void *)order;
501
* Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
502
* servicing faults for write access. In the normal case, do always want
503
* pte_mkwrite. But get_user_pages can cause write faults for mappings
504
* that do not have writing enabled, when used by access_process_vm.
506
static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
508
if (likely(vma->vm_flags & VM_WRITE))
509
pte = pte_mkwrite(pte);
515
* Multiple processes may "see" the same page. E.g. for untouched
516
* mappings of /dev/null, all processes see the same page full of
517
* zeroes, and text pages of executables and shared libraries have
518
* only one copy in memory, at most, normally.
520
* For the non-reserved pages, page_count(page) denotes a reference count.
521
* page_count() == 0 means the page is free. page->lru is then used for
522
* freelist management in the buddy allocator.
523
* page_count() > 0 means the page has been allocated.
525
* Pages are allocated by the slab allocator in order to provide memory
526
* to kmalloc and kmem_cache_alloc. In this case, the management of the
527
* page, and the fields in 'struct page' are the responsibility of mm/slab.c
528
* unless a particular usage is carefully commented. (the responsibility of
529
* freeing the kmalloc memory is the caller's, of course).
531
* A page may be used by anyone else who does a __get_free_page().
532
* In this case, page_count still tracks the references, and should only
533
* be used through the normal accessor functions. The top bits of page->flags
534
* and page->virtual store page management information, but all other fields
535
* are unused and could be used privately, carefully. The management of this
536
* page is the responsibility of the one who allocated it, and those who have
537
* subsequently been given references to it.
539
* The other pages (we may call them "pagecache pages") are completely
540
* managed by the Linux memory manager: I/O, buffers, swapping etc.
541
* The following discussion applies only to them.
543
* A pagecache page contains an opaque `private' member, which belongs to the
544
* page's address_space. Usually, this is the address of a circular list of
545
* the page's disk buffers. PG_private must be set to tell the VM to call
546
* into the filesystem to release these pages.
548
* A page may belong to an inode's memory mapping. In this case, page->mapping
549
* is the pointer to the inode, and page->index is the file offset of the page,
550
* in units of PAGE_CACHE_SIZE.
552
* If pagecache pages are not associated with an inode, they are said to be
553
* anonymous pages. These may become associated with the swapcache, and in that
554
* case PG_swapcache is set, and page->private is an offset into the swapcache.
556
* In either case (swapcache or inode backed), the pagecache itself holds one
557
* reference to the page. Setting PG_private should also increment the
558
* refcount. The each user mapping also has a reference to the page.
560
* The pagecache pages are stored in a per-mapping radix tree, which is
561
* rooted at mapping->page_tree, and indexed by offset.
562
* Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
563
* lists, we instead now tag pages as dirty/writeback in the radix tree.
565
* All pagecache pages may be subject to I/O:
566
* - inode pages may need to be read from disk,
567
* - inode pages which have been modified and are MAP_SHARED may need
568
* to be written back to the inode on disk,
569
* - anonymous pages (including MAP_PRIVATE file mappings) which have been
570
* modified may need to be swapped out to swap space and (later) to be read
575
* The zone field is never updated after free_area_init_core()
576
* sets it, so none of the operations on it need to be atomic.
581
* page->flags layout:
583
* There are three possibilities for how page->flags get
584
* laid out. The first is for the normal case, without
585
* sparsemem. The second is for sparsemem when there is
586
* plenty of space for node and section. The last is when
587
* we have run out of space and have to fall back to an
588
* alternate (slower) way of determining the node.
590
* No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS |
591
* classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS |
592
* classic sparse no space for node: | SECTION | ZONE | ... | FLAGS |
594
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
595
#define SECTIONS_WIDTH SECTIONS_SHIFT
597
#define SECTIONS_WIDTH 0
600
#define ZONES_WIDTH ZONES_SHIFT
602
#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS
603
#define NODES_WIDTH NODES_SHIFT
605
#ifdef CONFIG_SPARSEMEM_VMEMMAP
606
#error "Vmemmap: No space for nodes field in page flags"
608
#define NODES_WIDTH 0
611
/* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */
612
#define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
613
#define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
614
#define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
617
* We are going to use the flags for the page to node mapping if its in
618
* there. This includes the case where there is no node, so it is implicit.
620
#if !(NODES_WIDTH > 0 || NODES_SHIFT == 0)
621
#define NODE_NOT_IN_PAGE_FLAGS
625
* Define the bit shifts to access each section. For non-existent
626
* sections we define the shift as 0; that plus a 0 mask ensures
627
* the compiler will optimise away reference to them.
629
#define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
630
#define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
631
#define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
633
/* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
634
#ifdef NODE_NOT_IN_PAGE_FLAGS
635
#define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
636
#define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
637
SECTIONS_PGOFF : ZONES_PGOFF)
639
#define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
640
#define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
641
NODES_PGOFF : ZONES_PGOFF)
644
#define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
646
#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
647
#error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
650
#define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
651
#define NODES_MASK ((1UL << NODES_WIDTH) - 1)
652
#define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
653
#define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
655
static inline enum zone_type page_zonenum(const struct page *page)
657
return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
661
* The identification function is only used by the buddy allocator for
662
* determining if two pages could be buddies. We are not really
663
* identifying a zone since we could be using a the section number
664
* id if we have not node id available in page flags.
665
* We guarantee only that it will return the same value for two
666
* combinable pages in a zone.
668
static inline int page_zone_id(struct page *page)
670
return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
673
static inline int zone_to_nid(struct zone *zone)
682
#ifdef NODE_NOT_IN_PAGE_FLAGS
683
extern int page_to_nid(const struct page *page);
685
static inline int page_to_nid(const struct page *page)
687
return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
691
static inline struct zone *page_zone(const struct page *page)
693
return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
696
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
697
static inline void set_page_section(struct page *page, unsigned long section)
699
page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
700
page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
703
static inline unsigned long page_to_section(const struct page *page)
705
return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
709
static inline void set_page_zone(struct page *page, enum zone_type zone)
711
page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
712
page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
715
static inline void set_page_node(struct page *page, unsigned long node)
717
page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
718
page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
721
static inline void set_page_links(struct page *page, enum zone_type zone,
722
unsigned long node, unsigned long pfn)
724
set_page_zone(page, zone);
725
set_page_node(page, node);
726
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
727
set_page_section(page, pfn_to_section_nr(pfn));
732
* Some inline functions in vmstat.h depend on page_zone()
734
#include <linux/vmstat.h>
736
static __always_inline void *lowmem_page_address(const struct page *page)
738
return __va(PFN_PHYS(page_to_pfn(page)));
741
#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
742
#define HASHED_PAGE_VIRTUAL
745
#if defined(WANT_PAGE_VIRTUAL)
746
#define page_address(page) ((page)->virtual)
747
#define set_page_address(page, address) \
749
(page)->virtual = (address); \
751
#define page_address_init() do { } while(0)
754
#if defined(HASHED_PAGE_VIRTUAL)
755
void *page_address(const struct page *page);
756
void set_page_address(struct page *page, void *virtual);
757
void page_address_init(void);
760
#if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
761
#define page_address(page) lowmem_page_address(page)
762
#define set_page_address(page, address) do { } while(0)
763
#define page_address_init() do { } while(0)
767
* On an anonymous page mapped into a user virtual memory area,
768
* page->mapping points to its anon_vma, not to a struct address_space;
769
* with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
771
* On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
772
* the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
773
* and then page->mapping points, not to an anon_vma, but to a private
774
* structure which KSM associates with that merged page. See ksm.h.
776
* PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
778
* Please note that, confusingly, "page_mapping" refers to the inode
779
* address_space which maps the page from disk; whereas "page_mapped"
780
* refers to user virtual address space into which the page is mapped.
782
#define PAGE_MAPPING_ANON 1
783
#define PAGE_MAPPING_KSM 2
784
#define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
786
extern struct address_space swapper_space;
787
static inline struct address_space *page_mapping(struct page *page)
789
struct address_space *mapping = page->mapping;
791
VM_BUG_ON(PageSlab(page));
792
if (unlikely(PageSwapCache(page)))
793
mapping = &swapper_space;
794
else if ((unsigned long)mapping & PAGE_MAPPING_ANON)
799
/* Neutral page->mapping pointer to address_space or anon_vma or other */
800
static inline void *page_rmapping(struct page *page)
802
return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
805
static inline int PageAnon(struct page *page)
807
return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
811
* Return the pagecache index of the passed page. Regular pagecache pages
812
* use ->index whereas swapcache pages use ->private
814
static inline pgoff_t page_index(struct page *page)
816
if (unlikely(PageSwapCache(page)))
817
return page_private(page);
822
* Return true if this page is mapped into pagetables.
824
static inline int page_mapped(struct page *page)
826
return atomic_read(&(page)->_mapcount) >= 0;
830
* Different kinds of faults, as returned by handle_mm_fault().
831
* Used to decide whether a process gets delivered SIGBUS or
832
* just gets major/minor fault counters bumped up.
835
#define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
837
#define VM_FAULT_OOM 0x0001
838
#define VM_FAULT_SIGBUS 0x0002
839
#define VM_FAULT_MAJOR 0x0004
840
#define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
841
#define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
842
#define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
844
#define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
845
#define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
846
#define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
848
#define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
850
#define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
851
VM_FAULT_HWPOISON_LARGE)
853
/* Encode hstate index for a hwpoisoned large page */
854
#define VM_FAULT_SET_HINDEX(x) ((x) << 12)
855
#define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
858
* Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
860
extern void pagefault_out_of_memory(void);
862
#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
865
* Flags passed to show_mem() and show_free_areas() to suppress output in
868
#define SHOW_MEM_FILTER_NODES (0x0001u) /* filter disallowed nodes */
870
extern void show_free_areas(unsigned int flags);
871
extern bool skip_free_areas_node(unsigned int flags, int nid);
873
int shmem_lock(struct file *file, int lock, struct user_struct *user);
874
struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags);
875
int shmem_zero_setup(struct vm_area_struct *);
877
extern int can_do_mlock(void);
878
extern int user_shm_lock(size_t, struct user_struct *);
879
extern void user_shm_unlock(size_t, struct user_struct *);
882
* Parameter block passed down to zap_pte_range in exceptional cases.
885
struct vm_area_struct *nonlinear_vma; /* Check page->index if set */
886
struct address_space *check_mapping; /* Check page->mapping if set */
887
pgoff_t first_index; /* Lowest page->index to unmap */
888
pgoff_t last_index; /* Highest page->index to unmap */
891
struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
894
int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
896
unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
897
unsigned long size, struct zap_details *);
898
unsigned long unmap_vmas(struct mmu_gather *tlb,
899
struct vm_area_struct *start_vma, unsigned long start_addr,
900
unsigned long end_addr, unsigned long *nr_accounted,
901
struct zap_details *);
904
* mm_walk - callbacks for walk_page_range
905
* @pgd_entry: if set, called for each non-empty PGD (top-level) entry
906
* @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
907
* @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
908
* this handler is required to be able to handle
909
* pmd_trans_huge() pmds. They may simply choose to
910
* split_huge_page() instead of handling it explicitly.
911
* @pte_entry: if set, called for each non-empty PTE (4th-level) entry
912
* @pte_hole: if set, called for each hole at all levels
913
* @hugetlb_entry: if set, called for each hugetlb entry
914
* *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
917
* (see walk_page_range for more details)
920
int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *);
921
int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *);
922
int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *);
923
int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *);
924
int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *);
925
int (*hugetlb_entry)(pte_t *, unsigned long,
926
unsigned long, unsigned long, struct mm_walk *);
927
struct mm_struct *mm;
931
int walk_page_range(unsigned long addr, unsigned long end,
932
struct mm_walk *walk);
933
void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
934
unsigned long end, unsigned long floor, unsigned long ceiling);
935
int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
936
struct vm_area_struct *vma);
937
void unmap_mapping_range(struct address_space *mapping,
938
loff_t const holebegin, loff_t const holelen, int even_cows);
939
int follow_pfn(struct vm_area_struct *vma, unsigned long address,
941
int follow_phys(struct vm_area_struct *vma, unsigned long address,
942
unsigned int flags, unsigned long *prot, resource_size_t *phys);
943
int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
944
void *buf, int len, int write);
946
static inline void unmap_shared_mapping_range(struct address_space *mapping,
947
loff_t const holebegin, loff_t const holelen)
949
unmap_mapping_range(mapping, holebegin, holelen, 0);
952
extern void truncate_pagecache(struct inode *inode, loff_t old, loff_t new);
953
extern void truncate_setsize(struct inode *inode, loff_t newsize);
954
extern int vmtruncate(struct inode *inode, loff_t offset);
955
extern int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end);
957
int truncate_inode_page(struct address_space *mapping, struct page *page);
958
int generic_error_remove_page(struct address_space *mapping, struct page *page);
960
int invalidate_inode_page(struct page *page);
963
extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
964
unsigned long address, unsigned int flags);
965
extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
966
unsigned long address, unsigned int fault_flags);
968
static inline int handle_mm_fault(struct mm_struct *mm,
969
struct vm_area_struct *vma, unsigned long address,
972
/* should never happen if there's no MMU */
974
return VM_FAULT_SIGBUS;
976
static inline int fixup_user_fault(struct task_struct *tsk,
977
struct mm_struct *mm, unsigned long address,
978
unsigned int fault_flags)
980
/* should never happen if there's no MMU */
986
extern int make_pages_present(unsigned long addr, unsigned long end);
987
extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
988
extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
989
void *buf, int len, int write);
991
int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
992
unsigned long start, int len, unsigned int foll_flags,
993
struct page **pages, struct vm_area_struct **vmas,
995
int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
996
unsigned long start, int nr_pages, int write, int force,
997
struct page **pages, struct vm_area_struct **vmas);
998
int get_user_pages_fast(unsigned long start, int nr_pages, int write,
999
struct page **pages);
1000
struct page *get_dump_page(unsigned long addr);
1002
extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1003
extern void do_invalidatepage(struct page *page, unsigned long offset);
1005
int __set_page_dirty_nobuffers(struct page *page);
1006
int __set_page_dirty_no_writeback(struct page *page);
1007
int redirty_page_for_writepage(struct writeback_control *wbc,
1009
void account_page_dirtied(struct page *page, struct address_space *mapping);
1010
void account_page_writeback(struct page *page);
1011
int set_page_dirty(struct page *page);
1012
int set_page_dirty_lock(struct page *page);
1013
int clear_page_dirty_for_io(struct page *page);
1015
/* Is the vma a continuation of the stack vma above it? */
1016
static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1018
return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
1021
static inline int stack_guard_page_start(struct vm_area_struct *vma,
1024
return (vma->vm_flags & VM_GROWSDOWN) &&
1025
(vma->vm_start == addr) &&
1026
!vma_growsdown(vma->vm_prev, addr);
1029
/* Is the vma a continuation of the stack vma below it? */
1030
static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
1032
return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
1035
static inline int stack_guard_page_end(struct vm_area_struct *vma,
1038
return (vma->vm_flags & VM_GROWSUP) &&
1039
(vma->vm_end == addr) &&
1040
!vma_growsup(vma->vm_next, addr);
1043
extern unsigned long move_page_tables(struct vm_area_struct *vma,
1044
unsigned long old_addr, struct vm_area_struct *new_vma,
1045
unsigned long new_addr, unsigned long len);
1046
extern unsigned long do_mremap(unsigned long addr,
1047
unsigned long old_len, unsigned long new_len,
1048
unsigned long flags, unsigned long new_addr);
1049
extern int mprotect_fixup(struct vm_area_struct *vma,
1050
struct vm_area_struct **pprev, unsigned long start,
1051
unsigned long end, unsigned long newflags);
1054
* doesn't attempt to fault and will return short.
1056
int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1057
struct page **pages);
1059
* per-process(per-mm_struct) statistics.
1061
static inline void set_mm_counter(struct mm_struct *mm, int member, long value)
1063
atomic_long_set(&mm->rss_stat.count[member], value);
1066
#if defined(SPLIT_RSS_COUNTING)
1067
unsigned long get_mm_counter(struct mm_struct *mm, int member);
1069
static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1071
return atomic_long_read(&mm->rss_stat.count[member]);
1075
static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1077
atomic_long_add(value, &mm->rss_stat.count[member]);
1080
static inline void inc_mm_counter(struct mm_struct *mm, int member)
1082
atomic_long_inc(&mm->rss_stat.count[member]);
1085
static inline void dec_mm_counter(struct mm_struct *mm, int member)
1087
atomic_long_dec(&mm->rss_stat.count[member]);
1090
static inline unsigned long get_mm_rss(struct mm_struct *mm)
1092
return get_mm_counter(mm, MM_FILEPAGES) +
1093
get_mm_counter(mm, MM_ANONPAGES);
1096
static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1098
return max(mm->hiwater_rss, get_mm_rss(mm));
1101
static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1103
return max(mm->hiwater_vm, mm->total_vm);
1106
static inline void update_hiwater_rss(struct mm_struct *mm)
1108
unsigned long _rss = get_mm_rss(mm);
1110
if ((mm)->hiwater_rss < _rss)
1111
(mm)->hiwater_rss = _rss;
1114
static inline void update_hiwater_vm(struct mm_struct *mm)
1116
if (mm->hiwater_vm < mm->total_vm)
1117
mm->hiwater_vm = mm->total_vm;
1120
static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1121
struct mm_struct *mm)
1123
unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1125
if (*maxrss < hiwater_rss)
1126
*maxrss = hiwater_rss;
1129
#if defined(SPLIT_RSS_COUNTING)
1130
void sync_mm_rss(struct task_struct *task, struct mm_struct *mm);
1132
static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
1137
int vma_wants_writenotify(struct vm_area_struct *vma);
1139
extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1141
static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1145
__cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1149
#ifdef __PAGETABLE_PUD_FOLDED
1150
static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1151
unsigned long address)
1156
int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1159
#ifdef __PAGETABLE_PMD_FOLDED
1160
static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1161
unsigned long address)
1166
int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1169
int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1170
pmd_t *pmd, unsigned long address);
1171
int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1174
* The following ifdef needed to get the 4level-fixup.h header to work.
1175
* Remove it when 4level-fixup.h has been removed.
1177
#if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1178
static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1180
return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1181
NULL: pud_offset(pgd, address);
1184
static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1186
return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1187
NULL: pmd_offset(pud, address);
1189
#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1191
#if USE_SPLIT_PTLOCKS
1193
* We tuck a spinlock to guard each pagetable page into its struct page,
1194
* at page->private, with BUILD_BUG_ON to make sure that this will not
1195
* overflow into the next struct page (as it might with DEBUG_SPINLOCK).
1196
* When freeing, reset page->mapping so free_pages_check won't complain.
1198
#define __pte_lockptr(page) &((page)->ptl)
1199
#define pte_lock_init(_page) do { \
1200
spin_lock_init(__pte_lockptr(_page)); \
1202
#define pte_lock_deinit(page) ((page)->mapping = NULL)
1203
#define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
1204
#else /* !USE_SPLIT_PTLOCKS */
1206
* We use mm->page_table_lock to guard all pagetable pages of the mm.
1208
#define pte_lock_init(page) do {} while (0)
1209
#define pte_lock_deinit(page) do {} while (0)
1210
#define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
1211
#endif /* USE_SPLIT_PTLOCKS */
1213
static inline void pgtable_page_ctor(struct page *page)
1215
pte_lock_init(page);
1216
inc_zone_page_state(page, NR_PAGETABLE);
1219
static inline void pgtable_page_dtor(struct page *page)
1221
pte_lock_deinit(page);
1222
dec_zone_page_state(page, NR_PAGETABLE);
1225
#define pte_offset_map_lock(mm, pmd, address, ptlp) \
1227
spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1228
pte_t *__pte = pte_offset_map(pmd, address); \
1234
#define pte_unmap_unlock(pte, ptl) do { \
1239
#define pte_alloc_map(mm, vma, pmd, address) \
1240
((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1242
NULL: pte_offset_map(pmd, address))
1244
#define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1245
((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1247
NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1249
#define pte_alloc_kernel(pmd, address) \
1250
((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1251
NULL: pte_offset_kernel(pmd, address))
1253
extern void free_area_init(unsigned long * zones_size);
1254
extern void free_area_init_node(int nid, unsigned long * zones_size,
1255
unsigned long zone_start_pfn, unsigned long *zholes_size);
1256
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
1258
* With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its
1259
* zones, allocate the backing mem_map and account for memory holes in a more
1260
* architecture independent manner. This is a substitute for creating the
1261
* zone_sizes[] and zholes_size[] arrays and passing them to
1262
* free_area_init_node()
1264
* An architecture is expected to register range of page frames backed by
1265
* physical memory with add_active_range() before calling
1266
* free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1267
* usage, an architecture is expected to do something like
1269
* unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1271
* for_each_valid_physical_page_range()
1272
* add_active_range(node_id, start_pfn, end_pfn)
1273
* free_area_init_nodes(max_zone_pfns);
1275
* If the architecture guarantees that there are no holes in the ranges
1276
* registered with add_active_range(), free_bootmem_active_regions()
1277
* will call free_bootmem_node() for each registered physical page range.
1278
* Similarly sparse_memory_present_with_active_regions() calls
1279
* memory_present() for each range when SPARSEMEM is enabled.
1281
* See mm/page_alloc.c for more information on each function exposed by
1282
* CONFIG_ARCH_POPULATES_NODE_MAP
1284
extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1285
extern void add_active_range(unsigned int nid, unsigned long start_pfn,
1286
unsigned long end_pfn);
1287
extern void remove_active_range(unsigned int nid, unsigned long start_pfn,
1288
unsigned long end_pfn);
1289
extern void remove_all_active_ranges(void);
1290
void sort_node_map(void);
1291
unsigned long node_map_pfn_alignment(void);
1292
unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1293
unsigned long end_pfn);
1294
extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1295
unsigned long end_pfn);
1296
extern void get_pfn_range_for_nid(unsigned int nid,
1297
unsigned long *start_pfn, unsigned long *end_pfn);
1298
extern unsigned long find_min_pfn_with_active_regions(void);
1299
extern void free_bootmem_with_active_regions(int nid,
1300
unsigned long max_low_pfn);
1301
int add_from_early_node_map(struct range *range, int az,
1302
int nr_range, int nid);
1303
u64 __init find_memory_core_early(int nid, u64 size, u64 align,
1304
u64 goal, u64 limit);
1305
typedef int (*work_fn_t)(unsigned long, unsigned long, void *);
1306
extern void work_with_active_regions(int nid, work_fn_t work_fn, void *data);
1307
extern void sparse_memory_present_with_active_regions(int nid);
1308
#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
1310
#if !defined(CONFIG_ARCH_POPULATES_NODE_MAP) && \
1311
!defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1312
static inline int __early_pfn_to_nid(unsigned long pfn)
1317
/* please see mm/page_alloc.c */
1318
extern int __meminit early_pfn_to_nid(unsigned long pfn);
1319
#ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
1320
/* there is a per-arch backend function. */
1321
extern int __meminit __early_pfn_to_nid(unsigned long pfn);
1322
#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
1325
extern void set_dma_reserve(unsigned long new_dma_reserve);
1326
extern void memmap_init_zone(unsigned long, int, unsigned long,
1327
unsigned long, enum memmap_context);
1328
extern void setup_per_zone_wmarks(void);
1329
extern int __meminit init_per_zone_wmark_min(void);
1330
extern void mem_init(void);
1331
extern void __init mmap_init(void);
1332
extern void show_mem(unsigned int flags);
1333
extern void si_meminfo(struct sysinfo * val);
1334
extern void si_meminfo_node(struct sysinfo *val, int nid);
1335
extern int after_bootmem;
1337
extern __printf(3, 4)
1338
void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
1340
extern void setup_per_cpu_pageset(void);
1342
extern void zone_pcp_update(struct zone *zone);
1345
extern atomic_long_t mmap_pages_allocated;
1346
extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1349
void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old);
1350
void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *);
1351
void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *);
1352
struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma,
1353
struct prio_tree_iter *iter);
1355
#define vma_prio_tree_foreach(vma, iter, root, begin, end) \
1356
for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \
1357
(vma = vma_prio_tree_next(vma, iter)); )
1359
static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
1360
struct list_head *list)
1362
vma->shared.vm_set.parent = NULL;
1363
list_add_tail(&vma->shared.vm_set.list, list);
1367
extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1368
extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1369
unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1370
extern struct vm_area_struct *vma_merge(struct mm_struct *,
1371
struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1372
unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1373
struct mempolicy *);
1374
extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1375
extern int split_vma(struct mm_struct *,
1376
struct vm_area_struct *, unsigned long addr, int new_below);
1377
extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1378
extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1379
struct rb_node **, struct rb_node *);
1380
extern void unlink_file_vma(struct vm_area_struct *);
1381
extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1382
unsigned long addr, unsigned long len, pgoff_t pgoff);
1383
extern void exit_mmap(struct mm_struct *);
1385
extern int mm_take_all_locks(struct mm_struct *mm);
1386
extern void mm_drop_all_locks(struct mm_struct *mm);
1388
/* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */
1389
extern void added_exe_file_vma(struct mm_struct *mm);
1390
extern void removed_exe_file_vma(struct mm_struct *mm);
1391
extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1392
extern struct file *get_mm_exe_file(struct mm_struct *mm);
1394
extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1395
extern int install_special_mapping(struct mm_struct *mm,
1396
unsigned long addr, unsigned long len,
1397
unsigned long flags, struct page **pages);
1399
extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1401
extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1402
unsigned long len, unsigned long prot,
1403
unsigned long flag, unsigned long pgoff);
1404
extern unsigned long mmap_region(struct file *file, unsigned long addr,
1405
unsigned long len, unsigned long flags,
1406
vm_flags_t vm_flags, unsigned long pgoff);
1408
static inline unsigned long do_mmap(struct file *file, unsigned long addr,
1409
unsigned long len, unsigned long prot,
1410
unsigned long flag, unsigned long offset)
1412
unsigned long ret = -EINVAL;
1413
if ((offset + PAGE_ALIGN(len)) < offset)
1415
if (!(offset & ~PAGE_MASK))
1416
ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);
1421
extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1423
extern unsigned long do_brk(unsigned long, unsigned long);
1426
extern void truncate_inode_pages(struct address_space *, loff_t);
1427
extern void truncate_inode_pages_range(struct address_space *,
1428
loff_t lstart, loff_t lend);
1430
/* generic vm_area_ops exported for stackable file systems */
1431
extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1433
/* mm/page-writeback.c */
1434
int write_one_page(struct page *page, int wait);
1435
void task_dirty_inc(struct task_struct *tsk);
1438
#define VM_MAX_READAHEAD 128 /* kbytes */
1439
#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1441
int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1442
pgoff_t offset, unsigned long nr_to_read);
1444
void page_cache_sync_readahead(struct address_space *mapping,
1445
struct file_ra_state *ra,
1448
unsigned long size);
1450
void page_cache_async_readahead(struct address_space *mapping,
1451
struct file_ra_state *ra,
1455
unsigned long size);
1457
unsigned long max_sane_readahead(unsigned long nr);
1458
unsigned long ra_submit(struct file_ra_state *ra,
1459
struct address_space *mapping,
1462
/* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1463
extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1465
/* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1466
extern int expand_downwards(struct vm_area_struct *vma,
1467
unsigned long address);
1469
extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1471
#define expand_upwards(vma, address) do { } while (0)
1474
/* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1475
extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1476
extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1477
struct vm_area_struct **pprev);
1479
/* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1480
NULL if none. Assume start_addr < end_addr. */
1481
static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1483
struct vm_area_struct * vma = find_vma(mm,start_addr);
1485
if (vma && end_addr <= vma->vm_start)
1490
static inline unsigned long vma_pages(struct vm_area_struct *vma)
1492
return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
1496
pgprot_t vm_get_page_prot(unsigned long vm_flags);
1498
static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
1504
struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
1505
int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
1506
unsigned long pfn, unsigned long size, pgprot_t);
1507
int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
1508
int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
1510
int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
1513
struct page *follow_page(struct vm_area_struct *, unsigned long address,
1514
unsigned int foll_flags);
1515
#define FOLL_WRITE 0x01 /* check pte is writable */
1516
#define FOLL_TOUCH 0x02 /* mark page accessed */
1517
#define FOLL_GET 0x04 /* do get_page on page */
1518
#define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1519
#define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1520
#define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
1521
* and return without waiting upon it */
1522
#define FOLL_MLOCK 0x40 /* mark page as mlocked */
1523
#define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
1524
#define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
1526
typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
1528
extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
1529
unsigned long size, pte_fn_t fn, void *data);
1531
#ifdef CONFIG_PROC_FS
1532
void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
1534
static inline void vm_stat_account(struct mm_struct *mm,
1535
unsigned long flags, struct file *file, long pages)
1538
#endif /* CONFIG_PROC_FS */
1540
#ifdef CONFIG_DEBUG_PAGEALLOC
1541
extern int debug_pagealloc_enabled;
1543
extern void kernel_map_pages(struct page *page, int numpages, int enable);
1545
static inline void enable_debug_pagealloc(void)
1547
debug_pagealloc_enabled = 1;
1549
#ifdef CONFIG_HIBERNATION
1550
extern bool kernel_page_present(struct page *page);
1551
#endif /* CONFIG_HIBERNATION */
1554
kernel_map_pages(struct page *page, int numpages, int enable) {}
1555
static inline void enable_debug_pagealloc(void)
1558
#ifdef CONFIG_HIBERNATION
1559
static inline bool kernel_page_present(struct page *page) { return true; }
1560
#endif /* CONFIG_HIBERNATION */
1563
extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
1564
#ifdef __HAVE_ARCH_GATE_AREA
1565
int in_gate_area_no_mm(unsigned long addr);
1566
int in_gate_area(struct mm_struct *mm, unsigned long addr);
1568
int in_gate_area_no_mm(unsigned long addr);
1569
#define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
1570
#endif /* __HAVE_ARCH_GATE_AREA */
1572
int drop_caches_sysctl_handler(struct ctl_table *, int,
1573
void __user *, size_t *, loff_t *);
1574
unsigned long shrink_slab(struct shrink_control *shrink,
1575
unsigned long nr_pages_scanned,
1576
unsigned long lru_pages);
1579
#define randomize_va_space 0
1581
extern int randomize_va_space;
1584
const char * arch_vma_name(struct vm_area_struct *vma);
1585
void print_vma_addr(char *prefix, unsigned long rip);
1587
void sparse_mem_maps_populate_node(struct page **map_map,
1588
unsigned long pnum_begin,
1589
unsigned long pnum_end,
1590
unsigned long map_count,
1593
struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
1594
pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
1595
pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
1596
pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
1597
pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
1598
void *vmemmap_alloc_block(unsigned long size, int node);
1599
void *vmemmap_alloc_block_buf(unsigned long size, int node);
1600
void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
1601
int vmemmap_populate_basepages(struct page *start_page,
1602
unsigned long pages, int node);
1603
int vmemmap_populate(struct page *start_page, unsigned long pages, int node);
1604
void vmemmap_populate_print_last(void);
1608
MF_COUNT_INCREASED = 1 << 0,
1610
extern void memory_failure(unsigned long pfn, int trapno);
1611
extern int __memory_failure(unsigned long pfn, int trapno, int flags);
1612
extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
1613
extern int unpoison_memory(unsigned long pfn);
1614
extern int sysctl_memory_failure_early_kill;
1615
extern int sysctl_memory_failure_recovery;
1616
extern void shake_page(struct page *p, int access);
1617
extern atomic_long_t mce_bad_pages;
1618
extern int soft_offline_page(struct page *page, int flags);
1620
extern void dump_page(struct page *page);
1622
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
1623
extern void clear_huge_page(struct page *page,
1625
unsigned int pages_per_huge_page);
1626
extern void copy_user_huge_page(struct page *dst, struct page *src,
1627
unsigned long addr, struct vm_area_struct *vma,
1628
unsigned int pages_per_huge_page);
1629
#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
1631
#endif /* __KERNEL__ */
1632
#endif /* _LINUX_MM_H */