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_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
29 extern unsigned long max_mapnr
;
31 static inline void set_max_mapnr(unsigned long limit
)
36 static inline void set_max_mapnr(unsigned long limit
) { }
39 extern unsigned long totalram_pages
;
40 extern void * high_memory
;
41 extern int page_cluster
;
44 extern int sysctl_legacy_va_layout
;
46 #define sysctl_legacy_va_layout 0
50 #include <asm/pgtable.h>
51 #include <asm/processor.h>
54 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
57 extern unsigned long sysctl_user_reserve_kbytes
;
58 extern unsigned long sysctl_admin_reserve_kbytes
;
60 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
62 /* to align the pointer to the (next) page boundary */
63 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
65 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
66 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
69 * Linux kernel virtual memory manager primitives.
70 * The idea being to have a "virtual" mm in the same way
71 * we have a virtual fs - giving a cleaner interface to the
72 * mm details, and allowing different kinds of memory mappings
73 * (from shared memory to executable loading to arbitrary
77 extern struct kmem_cache
*vm_area_cachep
;
80 extern struct rb_root nommu_region_tree
;
81 extern struct rw_semaphore nommu_region_sem
;
83 extern unsigned int kobjsize(const void *objp
);
87 * vm_flags in vm_area_struct, see mm_types.h.
89 #define VM_NONE 0x00000000
91 #define VM_READ 0x00000001 /* currently active flags */
92 #define VM_WRITE 0x00000002
93 #define VM_EXEC 0x00000004
94 #define VM_SHARED 0x00000008
96 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
97 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
98 #define VM_MAYWRITE 0x00000020
99 #define VM_MAYEXEC 0x00000040
100 #define VM_MAYSHARE 0x00000080
102 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
103 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
104 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
106 #define VM_LOCKED 0x00002000
107 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
109 /* Used by sys_madvise() */
110 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
111 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
113 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
114 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
115 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
116 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
117 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
118 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
119 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
120 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
122 #ifdef CONFIG_MEM_SOFT_DIRTY
123 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
125 # define VM_SOFTDIRTY 0
128 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
129 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
130 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
131 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
133 #if defined(CONFIG_X86)
134 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
135 #elif defined(CONFIG_PPC)
136 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
137 #elif defined(CONFIG_PARISC)
138 # define VM_GROWSUP VM_ARCH_1
139 #elif defined(CONFIG_METAG)
140 # define VM_GROWSUP VM_ARCH_1
141 #elif defined(CONFIG_IA64)
142 # define VM_GROWSUP VM_ARCH_1
143 #elif !defined(CONFIG_MMU)
144 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
148 # define VM_GROWSUP VM_NONE
151 /* Bits set in the VMA until the stack is in its final location */
152 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
154 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
155 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
158 #ifdef CONFIG_STACK_GROWSUP
159 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
161 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
165 * Special vmas that are non-mergable, non-mlock()able.
166 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
168 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP)
171 * mapping from the currently active vm_flags protection bits (the
172 * low four bits) to a page protection mask..
174 extern pgprot_t protection_map
[16];
176 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
177 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
178 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */
179 #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */
180 #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */
181 #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */
182 #define FAULT_FLAG_TRIED 0x40 /* second try */
183 #define FAULT_FLAG_USER 0x80 /* The fault originated in userspace */
186 * vm_fault is filled by the the pagefault handler and passed to the vma's
187 * ->fault function. The vma's ->fault is responsible for returning a bitmask
188 * of VM_FAULT_xxx flags that give details about how the fault was handled.
190 * pgoff should be used in favour of virtual_address, if possible. If pgoff
191 * is used, one may implement ->remap_pages to get nonlinear mapping support.
194 unsigned int flags
; /* FAULT_FLAG_xxx flags */
195 pgoff_t pgoff
; /* Logical page offset based on vma */
196 void __user
*virtual_address
; /* Faulting virtual address */
198 struct page
*page
; /* ->fault handlers should return a
199 * page here, unless VM_FAULT_NOPAGE
200 * is set (which is also implied by
206 * These are the virtual MM functions - opening of an area, closing and
207 * unmapping it (needed to keep files on disk up-to-date etc), pointer
208 * to the functions called when a no-page or a wp-page exception occurs.
210 struct vm_operations_struct
{
211 void (*open
)(struct vm_area_struct
* area
);
212 void (*close
)(struct vm_area_struct
* area
);
213 int (*fault
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
215 /* notification that a previously read-only page is about to become
216 * writable, if an error is returned it will cause a SIGBUS */
217 int (*page_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
219 /* called by access_process_vm when get_user_pages() fails, typically
220 * for use by special VMAs that can switch between memory and hardware
222 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
223 void *buf
, int len
, int write
);
226 * set_policy() op must add a reference to any non-NULL @new mempolicy
227 * to hold the policy upon return. Caller should pass NULL @new to
228 * remove a policy and fall back to surrounding context--i.e. do not
229 * install a MPOL_DEFAULT policy, nor the task or system default
232 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
235 * get_policy() op must add reference [mpol_get()] to any policy at
236 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
237 * in mm/mempolicy.c will do this automatically.
238 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
239 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
240 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
241 * must return NULL--i.e., do not "fallback" to task or system default
244 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
246 int (*migrate
)(struct vm_area_struct
*vma
, const nodemask_t
*from
,
247 const nodemask_t
*to
, unsigned long flags
);
249 /* called by sys_remap_file_pages() to populate non-linear mapping */
250 int (*remap_pages
)(struct vm_area_struct
*vma
, unsigned long addr
,
251 unsigned long size
, pgoff_t pgoff
);
257 #define page_private(page) ((page)->private)
258 #define set_page_private(page, v) ((page)->private = (v))
260 /* It's valid only if the page is free path or free_list */
261 static inline void set_freepage_migratetype(struct page
*page
, int migratetype
)
263 page
->index
= migratetype
;
266 /* It's valid only if the page is free path or free_list */
267 static inline int get_freepage_migratetype(struct page
*page
)
273 * FIXME: take this include out, include page-flags.h in
274 * files which need it (119 of them)
276 #include <linux/page-flags.h>
277 #include <linux/huge_mm.h>
280 * Methods to modify the page usage count.
282 * What counts for a page usage:
283 * - cache mapping (page->mapping)
284 * - private data (page->private)
285 * - page mapped in a task's page tables, each mapping
286 * is counted separately
288 * Also, many kernel routines increase the page count before a critical
289 * routine so they can be sure the page doesn't go away from under them.
293 * Drop a ref, return true if the refcount fell to zero (the page has no users)
295 static inline int put_page_testzero(struct page
*page
)
297 VM_BUG_ON(atomic_read(&page
->_count
) == 0);
298 return atomic_dec_and_test(&page
->_count
);
302 * Try to grab a ref unless the page has a refcount of zero, return false if
304 * This can be called when MMU is off so it must not access
305 * any of the virtual mappings.
307 static inline int get_page_unless_zero(struct page
*page
)
309 return atomic_inc_not_zero(&page
->_count
);
313 * Try to drop a ref unless the page has a refcount of one, return false if
315 * This is to make sure that the refcount won't become zero after this drop.
316 * This can be called when MMU is off so it must not access
317 * any of the virtual mappings.
319 static inline int put_page_unless_one(struct page
*page
)
321 return atomic_add_unless(&page
->_count
, -1, 1);
324 extern int page_is_ram(unsigned long pfn
);
326 /* Support for virtually mapped pages */
327 struct page
*vmalloc_to_page(const void *addr
);
328 unsigned long vmalloc_to_pfn(const void *addr
);
331 * Determine if an address is within the vmalloc range
333 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
334 * is no special casing required.
336 static inline int is_vmalloc_addr(const void *x
)
339 unsigned long addr
= (unsigned long)x
;
341 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
347 extern int is_vmalloc_or_module_addr(const void *x
);
349 static inline int is_vmalloc_or_module_addr(const void *x
)
355 static inline void compound_lock(struct page
*page
)
357 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
358 VM_BUG_ON(PageSlab(page
));
359 bit_spin_lock(PG_compound_lock
, &page
->flags
);
363 static inline void compound_unlock(struct page
*page
)
365 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
366 VM_BUG_ON(PageSlab(page
));
367 bit_spin_unlock(PG_compound_lock
, &page
->flags
);
371 static inline unsigned long compound_lock_irqsave(struct page
*page
)
373 unsigned long uninitialized_var(flags
);
374 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
375 local_irq_save(flags
);
381 static inline void compound_unlock_irqrestore(struct page
*page
,
384 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
385 compound_unlock(page
);
386 local_irq_restore(flags
);
390 static inline struct page
*compound_head(struct page
*page
)
392 if (unlikely(PageTail(page
)))
393 return page
->first_page
;
398 * The atomic page->_mapcount, starts from -1: so that transitions
399 * both from it and to it can be tracked, using atomic_inc_and_test
400 * and atomic_add_negative(-1).
402 static inline void page_mapcount_reset(struct page
*page
)
404 atomic_set(&(page
)->_mapcount
, -1);
407 static inline int page_mapcount(struct page
*page
)
409 return atomic_read(&(page
)->_mapcount
) + 1;
412 static inline int page_count(struct page
*page
)
414 return atomic_read(&compound_head(page
)->_count
);
417 static inline void get_huge_page_tail(struct page
*page
)
420 * __split_huge_page_refcount() cannot run
423 VM_BUG_ON(page_mapcount(page
) < 0);
424 VM_BUG_ON(atomic_read(&page
->_count
) != 0);
425 atomic_inc(&page
->_mapcount
);
428 extern bool __get_page_tail(struct page
*page
);
430 static inline void get_page(struct page
*page
)
432 if (unlikely(PageTail(page
)))
433 if (likely(__get_page_tail(page
)))
436 * Getting a normal page or the head of a compound page
437 * requires to already have an elevated page->_count.
439 VM_BUG_ON(atomic_read(&page
->_count
) <= 0);
440 atomic_inc(&page
->_count
);
443 static inline struct page
*virt_to_head_page(const void *x
)
445 struct page
*page
= virt_to_page(x
);
446 return compound_head(page
);
450 * Setup the page count before being freed into the page allocator for
451 * the first time (boot or memory hotplug)
453 static inline void init_page_count(struct page
*page
)
455 atomic_set(&page
->_count
, 1);
459 * PageBuddy() indicate that the page is free and in the buddy system
460 * (see mm/page_alloc.c).
462 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
463 * -2 so that an underflow of the page_mapcount() won't be mistaken
464 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
465 * efficiently by most CPU architectures.
467 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
469 static inline int PageBuddy(struct page
*page
)
471 return atomic_read(&page
->_mapcount
) == PAGE_BUDDY_MAPCOUNT_VALUE
;
474 static inline void __SetPageBuddy(struct page
*page
)
476 VM_BUG_ON(atomic_read(&page
->_mapcount
) != -1);
477 atomic_set(&page
->_mapcount
, PAGE_BUDDY_MAPCOUNT_VALUE
);
480 static inline void __ClearPageBuddy(struct page
*page
)
482 VM_BUG_ON(!PageBuddy(page
));
483 atomic_set(&page
->_mapcount
, -1);
486 void put_page(struct page
*page
);
487 void put_pages_list(struct list_head
*pages
);
489 void split_page(struct page
*page
, unsigned int order
);
490 int split_free_page(struct page
*page
);
493 * Compound pages have a destructor function. Provide a
494 * prototype for that function and accessor functions.
495 * These are _only_ valid on the head of a PG_compound page.
497 typedef void compound_page_dtor(struct page
*);
499 static inline void set_compound_page_dtor(struct page
*page
,
500 compound_page_dtor
*dtor
)
502 page
[1].lru
.next
= (void *)dtor
;
505 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
507 return (compound_page_dtor
*)page
[1].lru
.next
;
510 static inline int compound_order(struct page
*page
)
514 return (unsigned long)page
[1].lru
.prev
;
517 static inline void set_compound_order(struct page
*page
, unsigned long order
)
519 page
[1].lru
.prev
= (void *)order
;
524 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
525 * servicing faults for write access. In the normal case, do always want
526 * pte_mkwrite. But get_user_pages can cause write faults for mappings
527 * that do not have writing enabled, when used by access_process_vm.
529 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
531 if (likely(vma
->vm_flags
& VM_WRITE
))
532 pte
= pte_mkwrite(pte
);
538 * Multiple processes may "see" the same page. E.g. for untouched
539 * mappings of /dev/null, all processes see the same page full of
540 * zeroes, and text pages of executables and shared libraries have
541 * only one copy in memory, at most, normally.
543 * For the non-reserved pages, page_count(page) denotes a reference count.
544 * page_count() == 0 means the page is free. page->lru is then used for
545 * freelist management in the buddy allocator.
546 * page_count() > 0 means the page has been allocated.
548 * Pages are allocated by the slab allocator in order to provide memory
549 * to kmalloc and kmem_cache_alloc. In this case, the management of the
550 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
551 * unless a particular usage is carefully commented. (the responsibility of
552 * freeing the kmalloc memory is the caller's, of course).
554 * A page may be used by anyone else who does a __get_free_page().
555 * In this case, page_count still tracks the references, and should only
556 * be used through the normal accessor functions. The top bits of page->flags
557 * and page->virtual store page management information, but all other fields
558 * are unused and could be used privately, carefully. The management of this
559 * page is the responsibility of the one who allocated it, and those who have
560 * subsequently been given references to it.
562 * The other pages (we may call them "pagecache pages") are completely
563 * managed by the Linux memory manager: I/O, buffers, swapping etc.
564 * The following discussion applies only to them.
566 * A pagecache page contains an opaque `private' member, which belongs to the
567 * page's address_space. Usually, this is the address of a circular list of
568 * the page's disk buffers. PG_private must be set to tell the VM to call
569 * into the filesystem to release these pages.
571 * A page may belong to an inode's memory mapping. In this case, page->mapping
572 * is the pointer to the inode, and page->index is the file offset of the page,
573 * in units of PAGE_CACHE_SIZE.
575 * If pagecache pages are not associated with an inode, they are said to be
576 * anonymous pages. These may become associated with the swapcache, and in that
577 * case PG_swapcache is set, and page->private is an offset into the swapcache.
579 * In either case (swapcache or inode backed), the pagecache itself holds one
580 * reference to the page. Setting PG_private should also increment the
581 * refcount. The each user mapping also has a reference to the page.
583 * The pagecache pages are stored in a per-mapping radix tree, which is
584 * rooted at mapping->page_tree, and indexed by offset.
585 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
586 * lists, we instead now tag pages as dirty/writeback in the radix tree.
588 * All pagecache pages may be subject to I/O:
589 * - inode pages may need to be read from disk,
590 * - inode pages which have been modified and are MAP_SHARED may need
591 * to be written back to the inode on disk,
592 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
593 * modified may need to be swapped out to swap space and (later) to be read
598 * The zone field is never updated after free_area_init_core()
599 * sets it, so none of the operations on it need to be atomic.
602 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
603 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
604 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
605 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
606 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
609 * Define the bit shifts to access each section. For non-existent
610 * sections we define the shift as 0; that plus a 0 mask ensures
611 * the compiler will optimise away reference to them.
613 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
614 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
615 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
616 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
618 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
619 #ifdef NODE_NOT_IN_PAGE_FLAGS
620 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
621 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
622 SECTIONS_PGOFF : ZONES_PGOFF)
624 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
625 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
626 NODES_PGOFF : ZONES_PGOFF)
629 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
631 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
632 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
635 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
636 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
637 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
638 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_WIDTH) - 1)
639 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
641 static inline enum zone_type
page_zonenum(const struct page
*page
)
643 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
646 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
647 #define SECTION_IN_PAGE_FLAGS
651 * The identification function is mainly used by the buddy allocator for
652 * determining if two pages could be buddies. We are not really identifying
653 * the zone since we could be using the section number id if we do not have
654 * node id available in page flags.
655 * We only guarantee that it will return the same value for two combinable
658 static inline int page_zone_id(struct page
*page
)
660 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
663 static inline int zone_to_nid(struct zone
*zone
)
672 #ifdef NODE_NOT_IN_PAGE_FLAGS
673 extern int page_to_nid(const struct page
*page
);
675 static inline int page_to_nid(const struct page
*page
)
677 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
681 #ifdef CONFIG_NUMA_BALANCING
682 static inline int cpu_pid_to_cpupid(int cpu
, int pid
)
684 return ((cpu
& LAST__CPU_MASK
) << LAST__PID_SHIFT
) | (pid
& LAST__PID_MASK
);
687 static inline int cpupid_to_pid(int cpupid
)
689 return cpupid
& LAST__PID_MASK
;
692 static inline int cpupid_to_cpu(int cpupid
)
694 return (cpupid
>> LAST__PID_SHIFT
) & LAST__CPU_MASK
;
697 static inline int cpupid_to_nid(int cpupid
)
699 return cpu_to_node(cpupid_to_cpu(cpupid
));
702 static inline bool cpupid_pid_unset(int cpupid
)
704 return cpupid_to_pid(cpupid
) == (-1 & LAST__PID_MASK
);
707 static inline bool cpupid_cpu_unset(int cpupid
)
709 return cpupid_to_cpu(cpupid
) == (-1 & LAST__CPU_MASK
);
712 static inline bool __cpupid_match_pid(pid_t task_pid
, int cpupid
)
714 return (task_pid
& LAST__PID_MASK
) == cpupid_to_pid(cpupid
);
717 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
718 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
719 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
721 return xchg(&page
->_last_cpupid
, cpupid
);
724 static inline int page_cpupid_last(struct page
*page
)
726 return page
->_last_cpupid
;
728 static inline void page_cpupid_reset_last(struct page
*page
)
730 page
->_last_cpupid
= -1;
733 static inline int page_cpupid_last(struct page
*page
)
735 return (page
->flags
>> LAST_CPUPID_PGSHIFT
) & LAST_CPUPID_MASK
;
738 extern int page_cpupid_xchg_last(struct page
*page
, int cpupid
);
740 static inline void page_cpupid_reset_last(struct page
*page
)
742 int cpupid
= (1 << LAST_CPUPID_SHIFT
) - 1;
744 page
->flags
&= ~(LAST_CPUPID_MASK
<< LAST_CPUPID_PGSHIFT
);
745 page
->flags
|= (cpupid
& LAST_CPUPID_MASK
) << LAST_CPUPID_PGSHIFT
;
747 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
748 #else /* !CONFIG_NUMA_BALANCING */
749 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
751 return page_to_nid(page
); /* XXX */
754 static inline int page_cpupid_last(struct page
*page
)
756 return page_to_nid(page
); /* XXX */
759 static inline int cpupid_to_nid(int cpupid
)
764 static inline int cpupid_to_pid(int cpupid
)
769 static inline int cpupid_to_cpu(int cpupid
)
774 static inline int cpu_pid_to_cpupid(int nid
, int pid
)
779 static inline bool cpupid_pid_unset(int cpupid
)
784 static inline void page_cpupid_reset_last(struct page
*page
)
788 static inline bool cpupid_match_pid(struct task_struct
*task
, int cpupid
)
792 #endif /* CONFIG_NUMA_BALANCING */
794 static inline struct zone
*page_zone(const struct page
*page
)
796 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
799 #ifdef SECTION_IN_PAGE_FLAGS
800 static inline void set_page_section(struct page
*page
, unsigned long section
)
802 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
803 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
806 static inline unsigned long page_to_section(const struct page
*page
)
808 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
812 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
814 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
815 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
818 static inline void set_page_node(struct page
*page
, unsigned long node
)
820 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
821 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
824 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
825 unsigned long node
, unsigned long pfn
)
827 set_page_zone(page
, zone
);
828 set_page_node(page
, node
);
829 #ifdef SECTION_IN_PAGE_FLAGS
830 set_page_section(page
, pfn_to_section_nr(pfn
));
835 * Some inline functions in vmstat.h depend on page_zone()
837 #include <linux/vmstat.h>
839 static __always_inline
void *lowmem_page_address(const struct page
*page
)
841 return __va(PFN_PHYS(page_to_pfn(page
)));
844 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
845 #define HASHED_PAGE_VIRTUAL
848 #if defined(WANT_PAGE_VIRTUAL)
849 #define page_address(page) ((page)->virtual)
850 #define set_page_address(page, address) \
852 (page)->virtual = (address); \
854 #define page_address_init() do { } while(0)
857 #if defined(HASHED_PAGE_VIRTUAL)
858 void *page_address(const struct page
*page
);
859 void set_page_address(struct page
*page
, void *virtual);
860 void page_address_init(void);
863 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
864 #define page_address(page) lowmem_page_address(page)
865 #define set_page_address(page, address) do { } while(0)
866 #define page_address_init() do { } while(0)
870 * On an anonymous page mapped into a user virtual memory area,
871 * page->mapping points to its anon_vma, not to a struct address_space;
872 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h.
874 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
875 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
876 * and then page->mapping points, not to an anon_vma, but to a private
877 * structure which KSM associates with that merged page. See ksm.h.
879 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
881 * Please note that, confusingly, "page_mapping" refers to the inode
882 * address_space which maps the page from disk; whereas "page_mapped"
883 * refers to user virtual address space into which the page is mapped.
885 #define PAGE_MAPPING_ANON 1
886 #define PAGE_MAPPING_KSM 2
887 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
889 extern struct address_space
*page_mapping(struct page
*page
);
891 /* Neutral page->mapping pointer to address_space or anon_vma or other */
892 static inline void *page_rmapping(struct page
*page
)
894 return (void *)((unsigned long)page
->mapping
& ~PAGE_MAPPING_FLAGS
);
897 extern struct address_space
*__page_file_mapping(struct page
*);
900 struct address_space
*page_file_mapping(struct page
*page
)
902 if (unlikely(PageSwapCache(page
)))
903 return __page_file_mapping(page
);
905 return page
->mapping
;
908 static inline int PageAnon(struct page
*page
)
910 return ((unsigned long)page
->mapping
& PAGE_MAPPING_ANON
) != 0;
914 * Return the pagecache index of the passed page. Regular pagecache pages
915 * use ->index whereas swapcache pages use ->private
917 static inline pgoff_t
page_index(struct page
*page
)
919 if (unlikely(PageSwapCache(page
)))
920 return page_private(page
);
924 extern pgoff_t
__page_file_index(struct page
*page
);
927 * Return the file index of the page. Regular pagecache pages use ->index
928 * whereas swapcache pages use swp_offset(->private)
930 static inline pgoff_t
page_file_index(struct page
*page
)
932 if (unlikely(PageSwapCache(page
)))
933 return __page_file_index(page
);
939 * Return true if this page is mapped into pagetables.
941 static inline int page_mapped(struct page
*page
)
943 return atomic_read(&(page
)->_mapcount
) >= 0;
947 * Different kinds of faults, as returned by handle_mm_fault().
948 * Used to decide whether a process gets delivered SIGBUS or
949 * just gets major/minor fault counters bumped up.
952 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
954 #define VM_FAULT_OOM 0x0001
955 #define VM_FAULT_SIGBUS 0x0002
956 #define VM_FAULT_MAJOR 0x0004
957 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
958 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
959 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
961 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
962 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
963 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
964 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
966 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
968 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
969 VM_FAULT_FALLBACK | VM_FAULT_HWPOISON_LARGE)
971 /* Encode hstate index for a hwpoisoned large page */
972 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
973 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
976 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
978 extern void pagefault_out_of_memory(void);
980 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
983 * Flags passed to show_mem() and show_free_areas() to suppress output in
986 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
987 #define SHOW_MEM_FILTER_PAGE_COUNT (0x0002u) /* page type count */
989 extern void show_free_areas(unsigned int flags
);
990 extern bool skip_free_areas_node(unsigned int flags
, int nid
);
992 int shmem_zero_setup(struct vm_area_struct
*);
994 extern int can_do_mlock(void);
995 extern int user_shm_lock(size_t, struct user_struct
*);
996 extern void user_shm_unlock(size_t, struct user_struct
*);
999 * Parameter block passed down to zap_pte_range in exceptional cases.
1001 struct zap_details
{
1002 struct vm_area_struct
*nonlinear_vma
; /* Check page->index if set */
1003 struct address_space
*check_mapping
; /* Check page->mapping if set */
1004 pgoff_t first_index
; /* Lowest page->index to unmap */
1005 pgoff_t last_index
; /* Highest page->index to unmap */
1008 struct page
*vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
1011 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
1012 unsigned long size
);
1013 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
1014 unsigned long size
, struct zap_details
*);
1015 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
1016 unsigned long start
, unsigned long end
);
1019 * mm_walk - callbacks for walk_page_range
1020 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
1021 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1022 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1023 * this handler is required to be able to handle
1024 * pmd_trans_huge() pmds. They may simply choose to
1025 * split_huge_page() instead of handling it explicitly.
1026 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1027 * @pte_hole: if set, called for each hole at all levels
1028 * @hugetlb_entry: if set, called for each hugetlb entry
1029 * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
1032 * (see walk_page_range for more details)
1035 int (*pgd_entry
)(pgd_t
*pgd
, unsigned long addr
,
1036 unsigned long next
, struct mm_walk
*walk
);
1037 int (*pud_entry
)(pud_t
*pud
, unsigned long addr
,
1038 unsigned long next
, struct mm_walk
*walk
);
1039 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
1040 unsigned long next
, struct mm_walk
*walk
);
1041 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
1042 unsigned long next
, struct mm_walk
*walk
);
1043 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
1044 struct mm_walk
*walk
);
1045 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
1046 unsigned long addr
, unsigned long next
,
1047 struct mm_walk
*walk
);
1048 struct mm_struct
*mm
;
1052 int walk_page_range(unsigned long addr
, unsigned long end
,
1053 struct mm_walk
*walk
);
1054 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1055 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1056 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1057 struct vm_area_struct
*vma
);
1058 void unmap_mapping_range(struct address_space
*mapping
,
1059 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1060 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1061 unsigned long *pfn
);
1062 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1063 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1064 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1065 void *buf
, int len
, int write
);
1067 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1068 loff_t
const holebegin
, loff_t
const holelen
)
1070 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1073 extern void truncate_pagecache(struct inode
*inode
, loff_t
new);
1074 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1075 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1076 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1077 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1078 int invalidate_inode_page(struct page
*page
);
1081 extern int handle_mm_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1082 unsigned long address
, unsigned int flags
);
1083 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1084 unsigned long address
, unsigned int fault_flags
);
1086 static inline int handle_mm_fault(struct mm_struct
*mm
,
1087 struct vm_area_struct
*vma
, unsigned long address
,
1090 /* should never happen if there's no MMU */
1092 return VM_FAULT_SIGBUS
;
1094 static inline int fixup_user_fault(struct task_struct
*tsk
,
1095 struct mm_struct
*mm
, unsigned long address
,
1096 unsigned int fault_flags
)
1098 /* should never happen if there's no MMU */
1104 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
1105 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1106 void *buf
, int len
, int write
);
1108 long __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1109 unsigned long start
, unsigned long nr_pages
,
1110 unsigned int foll_flags
, struct page
**pages
,
1111 struct vm_area_struct
**vmas
, int *nonblocking
);
1112 long get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1113 unsigned long start
, unsigned long nr_pages
,
1114 int write
, int force
, struct page
**pages
,
1115 struct vm_area_struct
**vmas
);
1116 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1117 struct page
**pages
);
1119 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1120 struct page
**pages
);
1121 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1122 struct page
*get_dump_page(unsigned long addr
);
1124 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1125 extern void do_invalidatepage(struct page
*page
, unsigned int offset
,
1126 unsigned int length
);
1128 int __set_page_dirty_nobuffers(struct page
*page
);
1129 int __set_page_dirty_no_writeback(struct page
*page
);
1130 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1132 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
);
1133 void account_page_writeback(struct page
*page
);
1134 int set_page_dirty(struct page
*page
);
1135 int set_page_dirty_lock(struct page
*page
);
1136 int clear_page_dirty_for_io(struct page
*page
);
1138 /* Is the vma a continuation of the stack vma above it? */
1139 static inline int vma_growsdown(struct vm_area_struct
*vma
, unsigned long addr
)
1141 return vma
&& (vma
->vm_end
== addr
) && (vma
->vm_flags
& VM_GROWSDOWN
);
1144 static inline int stack_guard_page_start(struct vm_area_struct
*vma
,
1147 return (vma
->vm_flags
& VM_GROWSDOWN
) &&
1148 (vma
->vm_start
== addr
) &&
1149 !vma_growsdown(vma
->vm_prev
, addr
);
1152 /* Is the vma a continuation of the stack vma below it? */
1153 static inline int vma_growsup(struct vm_area_struct
*vma
, unsigned long addr
)
1155 return vma
&& (vma
->vm_start
== addr
) && (vma
->vm_flags
& VM_GROWSUP
);
1158 static inline int stack_guard_page_end(struct vm_area_struct
*vma
,
1161 return (vma
->vm_flags
& VM_GROWSUP
) &&
1162 (vma
->vm_end
== addr
) &&
1163 !vma_growsup(vma
->vm_next
, addr
);
1167 vm_is_stack(struct task_struct
*task
, struct vm_area_struct
*vma
, int in_group
);
1169 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1170 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1171 unsigned long new_addr
, unsigned long len
,
1172 bool need_rmap_locks
);
1173 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1174 unsigned long end
, pgprot_t newprot
,
1175 int dirty_accountable
, int prot_numa
);
1176 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1177 struct vm_area_struct
**pprev
, unsigned long start
,
1178 unsigned long end
, unsigned long newflags
);
1181 * doesn't attempt to fault and will return short.
1183 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1184 struct page
**pages
);
1186 * per-process(per-mm_struct) statistics.
1188 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1190 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1192 #ifdef SPLIT_RSS_COUNTING
1194 * counter is updated in asynchronous manner and may go to minus.
1195 * But it's never be expected number for users.
1200 return (unsigned long)val
;
1203 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1205 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1208 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1210 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1213 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1215 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1218 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1220 return get_mm_counter(mm
, MM_FILEPAGES
) +
1221 get_mm_counter(mm
, MM_ANONPAGES
);
1224 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1226 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1229 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1231 return max(mm
->hiwater_vm
, mm
->total_vm
);
1234 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1236 unsigned long _rss
= get_mm_rss(mm
);
1238 if ((mm
)->hiwater_rss
< _rss
)
1239 (mm
)->hiwater_rss
= _rss
;
1242 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1244 if (mm
->hiwater_vm
< mm
->total_vm
)
1245 mm
->hiwater_vm
= mm
->total_vm
;
1248 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1249 struct mm_struct
*mm
)
1251 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1253 if (*maxrss
< hiwater_rss
)
1254 *maxrss
= hiwater_rss
;
1257 #if defined(SPLIT_RSS_COUNTING)
1258 void sync_mm_rss(struct mm_struct
*mm
);
1260 static inline void sync_mm_rss(struct mm_struct
*mm
)
1265 int vma_wants_writenotify(struct vm_area_struct
*vma
);
1267 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1269 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1273 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1277 #ifdef __PAGETABLE_PUD_FOLDED
1278 static inline int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1279 unsigned long address
)
1284 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1287 #ifdef __PAGETABLE_PMD_FOLDED
1288 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1289 unsigned long address
)
1294 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1297 int __pte_alloc(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1298 pmd_t
*pmd
, unsigned long address
);
1299 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1302 * The following ifdef needed to get the 4level-fixup.h header to work.
1303 * Remove it when 4level-fixup.h has been removed.
1305 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1306 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
1308 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
1309 NULL
: pud_offset(pgd
, address
);
1312 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1314 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1315 NULL
: pmd_offset(pud
, address
);
1317 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1319 #if USE_SPLIT_PTE_PTLOCKS
1320 #if BLOATED_SPINLOCKS
1321 void __init
ptlock_cache_init(void);
1322 extern bool ptlock_alloc(struct page
*page
);
1323 extern void ptlock_free(struct page
*page
);
1325 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1329 #else /* BLOATED_SPINLOCKS */
1330 static inline void ptlock_cache_init(void) {}
1331 static inline bool ptlock_alloc(struct page
*page
)
1336 static inline void ptlock_free(struct page
*page
)
1340 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1344 #endif /* BLOATED_SPINLOCKS */
1346 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1348 return ptlock_ptr(pmd_page(*pmd
));
1351 static inline bool ptlock_init(struct page
*page
)
1354 * prep_new_page() initialize page->private (and therefore page->ptl)
1355 * with 0. Make sure nobody took it in use in between.
1357 * It can happen if arch try to use slab for page table allocation:
1358 * slab code uses page->slab_cache and page->first_page (for tail
1359 * pages), which share storage with page->ptl.
1361 VM_BUG_ON(*(unsigned long *)&page
->ptl
);
1362 if (!ptlock_alloc(page
))
1364 spin_lock_init(ptlock_ptr(page
));
1368 /* Reset page->mapping so free_pages_check won't complain. */
1369 static inline void pte_lock_deinit(struct page
*page
)
1371 page
->mapping
= NULL
;
1375 #else /* !USE_SPLIT_PTE_PTLOCKS */
1377 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1379 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1381 return &mm
->page_table_lock
;
1383 static inline void ptlock_cache_init(void) {}
1384 static inline bool ptlock_init(struct page
*page
) { return true; }
1385 static inline void pte_lock_deinit(struct page
*page
) {}
1386 #endif /* USE_SPLIT_PTE_PTLOCKS */
1388 static inline void pgtable_init(void)
1390 ptlock_cache_init();
1391 pgtable_cache_init();
1394 static inline bool pgtable_page_ctor(struct page
*page
)
1396 inc_zone_page_state(page
, NR_PAGETABLE
);
1397 return ptlock_init(page
);
1400 static inline void pgtable_page_dtor(struct page
*page
)
1402 pte_lock_deinit(page
);
1403 dec_zone_page_state(page
, NR_PAGETABLE
);
1406 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1408 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1409 pte_t *__pte = pte_offset_map(pmd, address); \
1415 #define pte_unmap_unlock(pte, ptl) do { \
1420 #define pte_alloc_map(mm, vma, pmd, address) \
1421 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1423 NULL: pte_offset_map(pmd, address))
1425 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1426 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1428 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1430 #define pte_alloc_kernel(pmd, address) \
1431 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1432 NULL: pte_offset_kernel(pmd, address))
1434 #if USE_SPLIT_PMD_PTLOCKS
1436 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1438 return ptlock_ptr(virt_to_page(pmd
));
1441 static inline bool pgtable_pmd_page_ctor(struct page
*page
)
1443 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1444 page
->pmd_huge_pte
= NULL
;
1446 return ptlock_init(page
);
1449 static inline void pgtable_pmd_page_dtor(struct page
*page
)
1451 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1452 VM_BUG_ON(page
->pmd_huge_pte
);
1457 #define pmd_huge_pte(mm, pmd) (virt_to_page(pmd)->pmd_huge_pte)
1461 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1463 return &mm
->page_table_lock
;
1466 static inline bool pgtable_pmd_page_ctor(struct page
*page
) { return true; }
1467 static inline void pgtable_pmd_page_dtor(struct page
*page
) {}
1469 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1473 static inline spinlock_t
*pmd_lock(struct mm_struct
*mm
, pmd_t
*pmd
)
1475 spinlock_t
*ptl
= pmd_lockptr(mm
, pmd
);
1480 extern void free_area_init(unsigned long * zones_size
);
1481 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1482 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1483 extern void free_initmem(void);
1486 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1487 * into the buddy system. The freed pages will be poisoned with pattern
1488 * "poison" if it's within range [0, UCHAR_MAX].
1489 * Return pages freed into the buddy system.
1491 extern unsigned long free_reserved_area(void *start
, void *end
,
1492 int poison
, char *s
);
1494 #ifdef CONFIG_HIGHMEM
1496 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1497 * and totalram_pages.
1499 extern void free_highmem_page(struct page
*page
);
1502 extern void adjust_managed_page_count(struct page
*page
, long count
);
1503 extern void mem_init_print_info(const char *str
);
1505 /* Free the reserved page into the buddy system, so it gets managed. */
1506 static inline void __free_reserved_page(struct page
*page
)
1508 ClearPageReserved(page
);
1509 init_page_count(page
);
1513 static inline void free_reserved_page(struct page
*page
)
1515 __free_reserved_page(page
);
1516 adjust_managed_page_count(page
, 1);
1519 static inline void mark_page_reserved(struct page
*page
)
1521 SetPageReserved(page
);
1522 adjust_managed_page_count(page
, -1);
1526 * Default method to free all the __init memory into the buddy system.
1527 * The freed pages will be poisoned with pattern "poison" if it's within
1528 * range [0, UCHAR_MAX].
1529 * Return pages freed into the buddy system.
1531 static inline unsigned long free_initmem_default(int poison
)
1533 extern char __init_begin
[], __init_end
[];
1535 return free_reserved_area(&__init_begin
, &__init_end
,
1536 poison
, "unused kernel");
1539 static inline unsigned long get_num_physpages(void)
1542 unsigned long phys_pages
= 0;
1544 for_each_online_node(nid
)
1545 phys_pages
+= node_present_pages(nid
);
1550 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1552 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1553 * zones, allocate the backing mem_map and account for memory holes in a more
1554 * architecture independent manner. This is a substitute for creating the
1555 * zone_sizes[] and zholes_size[] arrays and passing them to
1556 * free_area_init_node()
1558 * An architecture is expected to register range of page frames backed by
1559 * physical memory with memblock_add[_node]() before calling
1560 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1561 * usage, an architecture is expected to do something like
1563 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1565 * for_each_valid_physical_page_range()
1566 * memblock_add_node(base, size, nid)
1567 * free_area_init_nodes(max_zone_pfns);
1569 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1570 * registered physical page range. Similarly
1571 * sparse_memory_present_with_active_regions() calls memory_present() for
1572 * each range when SPARSEMEM is enabled.
1574 * See mm/page_alloc.c for more information on each function exposed by
1575 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1577 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1578 unsigned long node_map_pfn_alignment(void);
1579 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1580 unsigned long end_pfn
);
1581 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1582 unsigned long end_pfn
);
1583 extern void get_pfn_range_for_nid(unsigned int nid
,
1584 unsigned long *start_pfn
, unsigned long *end_pfn
);
1585 extern unsigned long find_min_pfn_with_active_regions(void);
1586 extern void free_bootmem_with_active_regions(int nid
,
1587 unsigned long max_low_pfn
);
1588 extern void sparse_memory_present_with_active_regions(int nid
);
1590 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1592 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1593 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1594 static inline int __early_pfn_to_nid(unsigned long pfn
)
1599 /* please see mm/page_alloc.c */
1600 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1601 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
1602 /* there is a per-arch backend function. */
1603 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
);
1604 #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
1607 extern void set_dma_reserve(unsigned long new_dma_reserve
);
1608 extern void memmap_init_zone(unsigned long, int, unsigned long,
1609 unsigned long, enum memmap_context
);
1610 extern void setup_per_zone_wmarks(void);
1611 extern int __meminit
init_per_zone_wmark_min(void);
1612 extern void mem_init(void);
1613 extern void __init
mmap_init(void);
1614 extern void show_mem(unsigned int flags
);
1615 extern void si_meminfo(struct sysinfo
* val
);
1616 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
1618 extern __printf(3, 4)
1619 void warn_alloc_failed(gfp_t gfp_mask
, int order
, const char *fmt
, ...);
1621 extern void setup_per_cpu_pageset(void);
1623 extern void zone_pcp_update(struct zone
*zone
);
1624 extern void zone_pcp_reset(struct zone
*zone
);
1627 extern int min_free_kbytes
;
1630 extern atomic_long_t mmap_pages_allocated
;
1631 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
1633 /* interval_tree.c */
1634 void vma_interval_tree_insert(struct vm_area_struct
*node
,
1635 struct rb_root
*root
);
1636 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
1637 struct vm_area_struct
*prev
,
1638 struct rb_root
*root
);
1639 void vma_interval_tree_remove(struct vm_area_struct
*node
,
1640 struct rb_root
*root
);
1641 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root
*root
,
1642 unsigned long start
, unsigned long last
);
1643 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
1644 unsigned long start
, unsigned long last
);
1646 #define vma_interval_tree_foreach(vma, root, start, last) \
1647 for (vma = vma_interval_tree_iter_first(root, start, last); \
1648 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1650 static inline void vma_nonlinear_insert(struct vm_area_struct
*vma
,
1651 struct list_head
*list
)
1653 list_add_tail(&vma
->shared
.nonlinear
, list
);
1656 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
1657 struct rb_root
*root
);
1658 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
1659 struct rb_root
*root
);
1660 struct anon_vma_chain
*anon_vma_interval_tree_iter_first(
1661 struct rb_root
*root
, unsigned long start
, unsigned long last
);
1662 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
1663 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
1664 #ifdef CONFIG_DEBUG_VM_RB
1665 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
1668 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1669 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1670 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1673 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
1674 extern int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
1675 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
1676 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
1677 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
1678 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
1679 struct mempolicy
*);
1680 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
1681 extern int split_vma(struct mm_struct
*,
1682 struct vm_area_struct
*, unsigned long addr
, int new_below
);
1683 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
1684 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
1685 struct rb_node
**, struct rb_node
*);
1686 extern void unlink_file_vma(struct vm_area_struct
*);
1687 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
1688 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
1689 bool *need_rmap_locks
);
1690 extern void exit_mmap(struct mm_struct
*);
1692 extern int mm_take_all_locks(struct mm_struct
*mm
);
1693 extern void mm_drop_all_locks(struct mm_struct
*mm
);
1695 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
1696 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
1698 extern int may_expand_vm(struct mm_struct
*mm
, unsigned long npages
);
1699 extern int install_special_mapping(struct mm_struct
*mm
,
1700 unsigned long addr
, unsigned long len
,
1701 unsigned long flags
, struct page
**pages
);
1703 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1705 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
1706 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
);
1707 extern unsigned long do_mmap_pgoff(struct file
*file
, unsigned long addr
,
1708 unsigned long len
, unsigned long prot
, unsigned long flags
,
1709 unsigned long pgoff
, unsigned long *populate
);
1710 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
1713 extern int __mm_populate(unsigned long addr
, unsigned long len
,
1715 static inline void mm_populate(unsigned long addr
, unsigned long len
)
1718 (void) __mm_populate(addr
, len
, 1);
1721 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
1724 /* These take the mm semaphore themselves */
1725 extern unsigned long vm_brk(unsigned long, unsigned long);
1726 extern int vm_munmap(unsigned long, size_t);
1727 extern unsigned long vm_mmap(struct file
*, unsigned long,
1728 unsigned long, unsigned long,
1729 unsigned long, unsigned long);
1731 struct vm_unmapped_area_info
{
1732 #define VM_UNMAPPED_AREA_TOPDOWN 1
1733 unsigned long flags
;
1734 unsigned long length
;
1735 unsigned long low_limit
;
1736 unsigned long high_limit
;
1737 unsigned long align_mask
;
1738 unsigned long align_offset
;
1741 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
1742 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
1745 * Search for an unmapped address range.
1747 * We are looking for a range that:
1748 * - does not intersect with any VMA;
1749 * - is contained within the [low_limit, high_limit) interval;
1750 * - is at least the desired size.
1751 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1753 static inline unsigned long
1754 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
1756 if (!(info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
))
1757 return unmapped_area(info
);
1759 return unmapped_area_topdown(info
);
1763 extern void truncate_inode_pages(struct address_space
*, loff_t
);
1764 extern void truncate_inode_pages_range(struct address_space
*,
1765 loff_t lstart
, loff_t lend
);
1767 /* generic vm_area_ops exported for stackable file systems */
1768 extern int filemap_fault(struct vm_area_struct
*, struct vm_fault
*);
1769 extern int filemap_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1771 /* mm/page-writeback.c */
1772 int write_one_page(struct page
*page
, int wait
);
1773 void task_dirty_inc(struct task_struct
*tsk
);
1776 #define VM_MAX_READAHEAD 128 /* kbytes */
1777 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1779 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
1780 pgoff_t offset
, unsigned long nr_to_read
);
1782 void page_cache_sync_readahead(struct address_space
*mapping
,
1783 struct file_ra_state
*ra
,
1786 unsigned long size
);
1788 void page_cache_async_readahead(struct address_space
*mapping
,
1789 struct file_ra_state
*ra
,
1793 unsigned long size
);
1795 unsigned long max_sane_readahead(unsigned long nr
);
1796 unsigned long ra_submit(struct file_ra_state
*ra
,
1797 struct address_space
*mapping
,
1800 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1801 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
1803 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1804 extern int expand_downwards(struct vm_area_struct
*vma
,
1805 unsigned long address
);
1807 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
1809 #define expand_upwards(vma, address) do { } while (0)
1812 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1813 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
1814 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
1815 struct vm_area_struct
**pprev
);
1817 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1818 NULL if none. Assume start_addr < end_addr. */
1819 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
1821 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
1823 if (vma
&& end_addr
<= vma
->vm_start
)
1828 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
1830 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
1833 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1834 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
1835 unsigned long vm_start
, unsigned long vm_end
)
1837 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
1839 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
1846 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
1848 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
1854 #ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
1855 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
1856 unsigned long start
, unsigned long end
);
1859 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
1860 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
1861 unsigned long pfn
, unsigned long size
, pgprot_t
);
1862 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
1863 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
1865 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
1867 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
1870 struct page
*follow_page_mask(struct vm_area_struct
*vma
,
1871 unsigned long address
, unsigned int foll_flags
,
1872 unsigned int *page_mask
);
1874 static inline struct page
*follow_page(struct vm_area_struct
*vma
,
1875 unsigned long address
, unsigned int foll_flags
)
1877 unsigned int unused_page_mask
;
1878 return follow_page_mask(vma
, address
, foll_flags
, &unused_page_mask
);
1881 #define FOLL_WRITE 0x01 /* check pte is writable */
1882 #define FOLL_TOUCH 0x02 /* mark page accessed */
1883 #define FOLL_GET 0x04 /* do get_page on page */
1884 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1885 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1886 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
1887 * and return without waiting upon it */
1888 #define FOLL_MLOCK 0x40 /* mark page as mlocked */
1889 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
1890 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
1891 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
1892 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
1894 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
1896 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
1897 unsigned long size
, pte_fn_t fn
, void *data
);
1899 #ifdef CONFIG_PROC_FS
1900 void vm_stat_account(struct mm_struct
*, unsigned long, struct file
*, long);
1902 static inline void vm_stat_account(struct mm_struct
*mm
,
1903 unsigned long flags
, struct file
*file
, long pages
)
1905 mm
->total_vm
+= pages
;
1907 #endif /* CONFIG_PROC_FS */
1909 #ifdef CONFIG_DEBUG_PAGEALLOC
1910 extern void kernel_map_pages(struct page
*page
, int numpages
, int enable
);
1911 #ifdef CONFIG_HIBERNATION
1912 extern bool kernel_page_present(struct page
*page
);
1913 #endif /* CONFIG_HIBERNATION */
1916 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
1917 #ifdef CONFIG_HIBERNATION
1918 static inline bool kernel_page_present(struct page
*page
) { return true; }
1919 #endif /* CONFIG_HIBERNATION */
1922 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
1923 #ifdef __HAVE_ARCH_GATE_AREA
1924 int in_gate_area_no_mm(unsigned long addr
);
1925 int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
1927 int in_gate_area_no_mm(unsigned long addr
);
1928 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
1929 #endif /* __HAVE_ARCH_GATE_AREA */
1931 #ifdef CONFIG_SYSCTL
1932 extern int sysctl_drop_caches
;
1933 int drop_caches_sysctl_handler(struct ctl_table
*, int,
1934 void __user
*, size_t *, loff_t
*);
1937 unsigned long shrink_slab(struct shrink_control
*shrink
,
1938 unsigned long nr_pages_scanned
,
1939 unsigned long lru_pages
);
1942 #define randomize_va_space 0
1944 extern int randomize_va_space
;
1947 const char * arch_vma_name(struct vm_area_struct
*vma
);
1948 void print_vma_addr(char *prefix
, unsigned long rip
);
1950 void sparse_mem_maps_populate_node(struct page
**map_map
,
1951 unsigned long pnum_begin
,
1952 unsigned long pnum_end
,
1953 unsigned long map_count
,
1956 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
1957 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
1958 pud_t
*vmemmap_pud_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
1959 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
1960 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
1961 void *vmemmap_alloc_block(unsigned long size
, int node
);
1962 void *vmemmap_alloc_block_buf(unsigned long size
, int node
);
1963 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
1964 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
1966 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
);
1967 void vmemmap_populate_print_last(void);
1968 #ifdef CONFIG_MEMORY_HOTPLUG
1969 void vmemmap_free(unsigned long start
, unsigned long end
);
1971 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
1972 unsigned long size
);
1975 MF_COUNT_INCREASED
= 1 << 0,
1976 MF_ACTION_REQUIRED
= 1 << 1,
1977 MF_MUST_KILL
= 1 << 2,
1978 MF_SOFT_OFFLINE
= 1 << 3,
1980 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
1981 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
1982 extern int unpoison_memory(unsigned long pfn
);
1983 extern int sysctl_memory_failure_early_kill
;
1984 extern int sysctl_memory_failure_recovery
;
1985 extern void shake_page(struct page
*p
, int access
);
1986 extern atomic_long_t num_poisoned_pages
;
1987 extern int soft_offline_page(struct page
*page
, int flags
);
1989 extern void dump_page(struct page
*page
);
1991 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
1992 extern void clear_huge_page(struct page
*page
,
1994 unsigned int pages_per_huge_page
);
1995 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
1996 unsigned long addr
, struct vm_area_struct
*vma
,
1997 unsigned int pages_per_huge_page
);
1998 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2000 #ifdef CONFIG_DEBUG_PAGEALLOC
2001 extern unsigned int _debug_guardpage_minorder
;
2003 static inline unsigned int debug_guardpage_minorder(void)
2005 return _debug_guardpage_minorder
;
2008 static inline bool page_is_guard(struct page
*page
)
2010 return test_bit(PAGE_DEBUG_FLAG_GUARD
, &page
->debug_flags
);
2013 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2014 static inline bool page_is_guard(struct page
*page
) { return false; }
2015 #endif /* CONFIG_DEBUG_PAGEALLOC */
2017 #if MAX_NUMNODES > 1
2018 void __init
setup_nr_node_ids(void);
2020 static inline void setup_nr_node_ids(void) {}
2023 #endif /* __KERNEL__ */
2024 #endif /* _LINUX_MM_H */