4 #include <linux/errno.h>
8 #include <linux/mmdebug.h>
10 #include <linux/bug.h>
11 #include <linux/list.h>
12 #include <linux/mmzone.h>
13 #include <linux/rbtree.h>
14 #include <linux/atomic.h>
15 #include <linux/debug_locks.h>
16 #include <linux/mm_types.h>
17 #include <linux/range.h>
18 #include <linux/pfn.h>
19 #include <linux/percpu-refcount.h>
20 #include <linux/bit_spinlock.h>
21 #include <linux/shrinker.h>
22 #include <linux/resource.h>
23 #include <linux/page_ext.h>
24 #include <linux/err.h>
28 struct anon_vma_chain
;
31 struct writeback_control
;
34 #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
35 extern unsigned long max_mapnr
;
37 static inline void set_max_mapnr(unsigned long limit
)
42 static inline void set_max_mapnr(unsigned long limit
) { }
45 extern unsigned long totalram_pages
;
46 extern void * high_memory
;
47 extern int page_cluster
;
50 extern int sysctl_legacy_va_layout
;
52 #define sysctl_legacy_va_layout 0
55 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
56 extern const int mmap_rnd_bits_min
;
57 extern const int mmap_rnd_bits_max
;
58 extern int mmap_rnd_bits __read_mostly
;
60 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
61 extern const int mmap_rnd_compat_bits_min
;
62 extern const int mmap_rnd_compat_bits_max
;
63 extern int mmap_rnd_compat_bits __read_mostly
;
67 #include <asm/pgtable.h>
68 #include <asm/processor.h>
71 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
75 * To prevent common memory management code establishing
76 * a zero page mapping on a read fault.
77 * This macro should be defined within <asm/pgtable.h>.
78 * s390 does this to prevent multiplexing of hardware bits
79 * related to the physical page in case of virtualization.
81 #ifndef mm_forbids_zeropage
82 #define mm_forbids_zeropage(X) (0)
85 extern unsigned long sysctl_user_reserve_kbytes
;
86 extern unsigned long sysctl_admin_reserve_kbytes
;
88 extern int sysctl_overcommit_memory
;
89 extern int sysctl_overcommit_ratio
;
90 extern unsigned long sysctl_overcommit_kbytes
;
92 extern int overcommit_ratio_handler(struct ctl_table
*, int, void __user
*,
94 extern int overcommit_kbytes_handler(struct ctl_table
*, int, void __user
*,
97 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
99 /* to align the pointer to the (next) page boundary */
100 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
102 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
103 #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
106 * Linux kernel virtual memory manager primitives.
107 * The idea being to have a "virtual" mm in the same way
108 * we have a virtual fs - giving a cleaner interface to the
109 * mm details, and allowing different kinds of memory mappings
110 * (from shared memory to executable loading to arbitrary
114 extern struct kmem_cache
*vm_area_cachep
;
117 extern struct rb_root nommu_region_tree
;
118 extern struct rw_semaphore nommu_region_sem
;
120 extern unsigned int kobjsize(const void *objp
);
124 * vm_flags in vm_area_struct, see mm_types.h.
126 #define VM_NONE 0x00000000
128 #define VM_READ 0x00000001 /* currently active flags */
129 #define VM_WRITE 0x00000002
130 #define VM_EXEC 0x00000004
131 #define VM_SHARED 0x00000008
133 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
134 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
135 #define VM_MAYWRITE 0x00000020
136 #define VM_MAYEXEC 0x00000040
137 #define VM_MAYSHARE 0x00000080
139 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
140 #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
141 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
142 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
143 #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
145 #define VM_LOCKED 0x00002000
146 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
148 /* Used by sys_madvise() */
149 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
150 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
152 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
153 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
154 #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
155 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
156 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
157 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
158 #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
159 #define VM_ARCH_2 0x02000000
160 #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
162 #ifdef CONFIG_MEM_SOFT_DIRTY
163 # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
165 # define VM_SOFTDIRTY 0
168 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
169 #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
170 #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
171 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
173 #if defined(CONFIG_X86)
174 # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
175 #elif defined(CONFIG_PPC)
176 # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
177 #elif defined(CONFIG_PARISC)
178 # define VM_GROWSUP VM_ARCH_1
179 #elif defined(CONFIG_METAG)
180 # define VM_GROWSUP VM_ARCH_1
181 #elif defined(CONFIG_IA64)
182 # define VM_GROWSUP VM_ARCH_1
183 #elif !defined(CONFIG_MMU)
184 # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
187 #if defined(CONFIG_X86)
188 /* MPX specific bounds table or bounds directory */
189 # define VM_MPX VM_ARCH_2
193 # define VM_GROWSUP VM_NONE
196 /* Bits set in the VMA until the stack is in its final location */
197 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
199 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
200 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
203 #ifdef CONFIG_STACK_GROWSUP
204 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
206 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
210 * Special vmas that are non-mergable, non-mlock()able.
211 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
213 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
215 /* This mask defines which mm->def_flags a process can inherit its parent */
216 #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
218 /* This mask is used to clear all the VMA flags used by mlock */
219 #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
222 * mapping from the currently active vm_flags protection bits (the
223 * low four bits) to a page protection mask..
225 extern pgprot_t protection_map
[16];
227 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
228 #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
229 #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
230 #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
231 #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
232 #define FAULT_FLAG_TRIED 0x20 /* Second try */
233 #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
236 * vm_fault is filled by the the pagefault handler and passed to the vma's
237 * ->fault function. The vma's ->fault is responsible for returning a bitmask
238 * of VM_FAULT_xxx flags that give details about how the fault was handled.
240 * MM layer fills up gfp_mask for page allocations but fault handler might
241 * alter it if its implementation requires a different allocation context.
243 * pgoff should be used in favour of virtual_address, if possible.
246 unsigned int flags
; /* FAULT_FLAG_xxx flags */
247 gfp_t gfp_mask
; /* gfp mask to be used for allocations */
248 pgoff_t pgoff
; /* Logical page offset based on vma */
249 void __user
*virtual_address
; /* Faulting virtual address */
251 struct page
*cow_page
; /* Handler may choose to COW */
252 struct page
*page
; /* ->fault handlers should return a
253 * page here, unless VM_FAULT_NOPAGE
254 * is set (which is also implied by
257 /* for ->map_pages() only */
258 pgoff_t max_pgoff
; /* map pages for offset from pgoff till
259 * max_pgoff inclusive */
260 pte_t
*pte
; /* pte entry associated with ->pgoff */
264 * These are the virtual MM functions - opening of an area, closing and
265 * unmapping it (needed to keep files on disk up-to-date etc), pointer
266 * to the functions called when a no-page or a wp-page exception occurs.
268 struct vm_operations_struct
{
269 void (*open
)(struct vm_area_struct
* area
);
270 void (*close
)(struct vm_area_struct
* area
);
271 int (*mremap
)(struct vm_area_struct
* area
);
272 int (*fault
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
273 int (*pmd_fault
)(struct vm_area_struct
*, unsigned long address
,
274 pmd_t
*, unsigned int flags
);
275 void (*map_pages
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
277 /* notification that a previously read-only page is about to become
278 * writable, if an error is returned it will cause a SIGBUS */
279 int (*page_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
281 /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
282 int (*pfn_mkwrite
)(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
284 /* called by access_process_vm when get_user_pages() fails, typically
285 * for use by special VMAs that can switch between memory and hardware
287 int (*access
)(struct vm_area_struct
*vma
, unsigned long addr
,
288 void *buf
, int len
, int write
);
290 /* Called by the /proc/PID/maps code to ask the vma whether it
291 * has a special name. Returning non-NULL will also cause this
292 * vma to be dumped unconditionally. */
293 const char *(*name
)(struct vm_area_struct
*vma
);
297 * set_policy() op must add a reference to any non-NULL @new mempolicy
298 * to hold the policy upon return. Caller should pass NULL @new to
299 * remove a policy and fall back to surrounding context--i.e. do not
300 * install a MPOL_DEFAULT policy, nor the task or system default
303 int (*set_policy
)(struct vm_area_struct
*vma
, struct mempolicy
*new);
306 * get_policy() op must add reference [mpol_get()] to any policy at
307 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
308 * in mm/mempolicy.c will do this automatically.
309 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
310 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
311 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
312 * must return NULL--i.e., do not "fallback" to task or system default
315 struct mempolicy
*(*get_policy
)(struct vm_area_struct
*vma
,
319 * Called by vm_normal_page() for special PTEs to find the
320 * page for @addr. This is useful if the default behavior
321 * (using pte_page()) would not find the correct page.
323 struct page
*(*find_special_page
)(struct vm_area_struct
*vma
,
330 #define page_private(page) ((page)->private)
331 #define set_page_private(page, v) ((page)->private = (v))
333 #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
334 static inline int pmd_devmap(pmd_t pmd
)
341 * FIXME: take this include out, include page-flags.h in
342 * files which need it (119 of them)
344 #include <linux/page-flags.h>
345 #include <linux/huge_mm.h>
348 * Methods to modify the page usage count.
350 * What counts for a page usage:
351 * - cache mapping (page->mapping)
352 * - private data (page->private)
353 * - page mapped in a task's page tables, each mapping
354 * is counted separately
356 * Also, many kernel routines increase the page count before a critical
357 * routine so they can be sure the page doesn't go away from under them.
361 * Drop a ref, return true if the refcount fell to zero (the page has no users)
363 static inline int put_page_testzero(struct page
*page
)
365 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) == 0, page
);
366 return atomic_dec_and_test(&page
->_count
);
370 * Try to grab a ref unless the page has a refcount of zero, return false if
372 * This can be called when MMU is off so it must not access
373 * any of the virtual mappings.
375 static inline int get_page_unless_zero(struct page
*page
)
377 return atomic_inc_not_zero(&page
->_count
);
380 extern int page_is_ram(unsigned long pfn
);
388 int region_intersects(resource_size_t offset
, size_t size
, const char *type
);
390 /* Support for virtually mapped pages */
391 struct page
*vmalloc_to_page(const void *addr
);
392 unsigned long vmalloc_to_pfn(const void *addr
);
395 * Determine if an address is within the vmalloc range
397 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
398 * is no special casing required.
400 static inline int is_vmalloc_addr(const void *x
)
403 unsigned long addr
= (unsigned long)x
;
405 return addr
>= VMALLOC_START
&& addr
< VMALLOC_END
;
411 extern int is_vmalloc_or_module_addr(const void *x
);
413 static inline int is_vmalloc_or_module_addr(const void *x
)
419 extern void kvfree(const void *addr
);
421 static inline atomic_t
*compound_mapcount_ptr(struct page
*page
)
423 return &page
[1].compound_mapcount
;
426 static inline int compound_mapcount(struct page
*page
)
428 if (!PageCompound(page
))
430 page
= compound_head(page
);
431 return atomic_read(compound_mapcount_ptr(page
)) + 1;
435 * The atomic page->_mapcount, starts from -1: so that transitions
436 * both from it and to it can be tracked, using atomic_inc_and_test
437 * and atomic_add_negative(-1).
439 static inline void page_mapcount_reset(struct page
*page
)
441 atomic_set(&(page
)->_mapcount
, -1);
444 int __page_mapcount(struct page
*page
);
446 static inline int page_mapcount(struct page
*page
)
448 VM_BUG_ON_PAGE(PageSlab(page
), page
);
450 if (unlikely(PageCompound(page
)))
451 return __page_mapcount(page
);
452 return atomic_read(&page
->_mapcount
) + 1;
455 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
456 int total_mapcount(struct page
*page
);
458 static inline int total_mapcount(struct page
*page
)
460 return page_mapcount(page
);
464 static inline int page_count(struct page
*page
)
466 return atomic_read(&compound_head(page
)->_count
);
469 static inline struct page
*virt_to_head_page(const void *x
)
471 struct page
*page
= virt_to_page(x
);
473 return compound_head(page
);
477 * Setup the page count before being freed into the page allocator for
478 * the first time (boot or memory hotplug)
480 static inline void init_page_count(struct page
*page
)
482 atomic_set(&page
->_count
, 1);
485 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 compound page.
497 typedef void compound_page_dtor(struct page
*);
499 /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
500 enum compound_dtor_id
{
503 #ifdef CONFIG_HUGETLB_PAGE
506 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
511 extern compound_page_dtor
* const compound_page_dtors
[];
513 static inline void set_compound_page_dtor(struct page
*page
,
514 enum compound_dtor_id compound_dtor
)
516 VM_BUG_ON_PAGE(compound_dtor
>= NR_COMPOUND_DTORS
, page
);
517 page
[1].compound_dtor
= compound_dtor
;
520 static inline compound_page_dtor
*get_compound_page_dtor(struct page
*page
)
522 VM_BUG_ON_PAGE(page
[1].compound_dtor
>= NR_COMPOUND_DTORS
, page
);
523 return compound_page_dtors
[page
[1].compound_dtor
];
526 static inline unsigned int compound_order(struct page
*page
)
530 return page
[1].compound_order
;
533 static inline void set_compound_order(struct page
*page
, unsigned int order
)
535 page
[1].compound_order
= order
;
538 void free_compound_page(struct page
*page
);
542 * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
543 * servicing faults for write access. In the normal case, do always want
544 * pte_mkwrite. But get_user_pages can cause write faults for mappings
545 * that do not have writing enabled, when used by access_process_vm.
547 static inline pte_t
maybe_mkwrite(pte_t pte
, struct vm_area_struct
*vma
)
549 if (likely(vma
->vm_flags
& VM_WRITE
))
550 pte
= pte_mkwrite(pte
);
554 void do_set_pte(struct vm_area_struct
*vma
, unsigned long address
,
555 struct page
*page
, pte_t
*pte
, bool write
, bool anon
);
559 * Multiple processes may "see" the same page. E.g. for untouched
560 * mappings of /dev/null, all processes see the same page full of
561 * zeroes, and text pages of executables and shared libraries have
562 * only one copy in memory, at most, normally.
564 * For the non-reserved pages, page_count(page) denotes a reference count.
565 * page_count() == 0 means the page is free. page->lru is then used for
566 * freelist management in the buddy allocator.
567 * page_count() > 0 means the page has been allocated.
569 * Pages are allocated by the slab allocator in order to provide memory
570 * to kmalloc and kmem_cache_alloc. In this case, the management of the
571 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
572 * unless a particular usage is carefully commented. (the responsibility of
573 * freeing the kmalloc memory is the caller's, of course).
575 * A page may be used by anyone else who does a __get_free_page().
576 * In this case, page_count still tracks the references, and should only
577 * be used through the normal accessor functions. The top bits of page->flags
578 * and page->virtual store page management information, but all other fields
579 * are unused and could be used privately, carefully. The management of this
580 * page is the responsibility of the one who allocated it, and those who have
581 * subsequently been given references to it.
583 * The other pages (we may call them "pagecache pages") are completely
584 * managed by the Linux memory manager: I/O, buffers, swapping etc.
585 * The following discussion applies only to them.
587 * A pagecache page contains an opaque `private' member, which belongs to the
588 * page's address_space. Usually, this is the address of a circular list of
589 * the page's disk buffers. PG_private must be set to tell the VM to call
590 * into the filesystem to release these pages.
592 * A page may belong to an inode's memory mapping. In this case, page->mapping
593 * is the pointer to the inode, and page->index is the file offset of the page,
594 * in units of PAGE_CACHE_SIZE.
596 * If pagecache pages are not associated with an inode, they are said to be
597 * anonymous pages. These may become associated with the swapcache, and in that
598 * case PG_swapcache is set, and page->private is an offset into the swapcache.
600 * In either case (swapcache or inode backed), the pagecache itself holds one
601 * reference to the page. Setting PG_private should also increment the
602 * refcount. The each user mapping also has a reference to the page.
604 * The pagecache pages are stored in a per-mapping radix tree, which is
605 * rooted at mapping->page_tree, and indexed by offset.
606 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
607 * lists, we instead now tag pages as dirty/writeback in the radix tree.
609 * All pagecache pages may be subject to I/O:
610 * - inode pages may need to be read from disk,
611 * - inode pages which have been modified and are MAP_SHARED may need
612 * to be written back to the inode on disk,
613 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
614 * modified may need to be swapped out to swap space and (later) to be read
619 * The zone field is never updated after free_area_init_core()
620 * sets it, so none of the operations on it need to be atomic.
623 /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
624 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
625 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
626 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
627 #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
630 * Define the bit shifts to access each section. For non-existent
631 * sections we define the shift as 0; that plus a 0 mask ensures
632 * the compiler will optimise away reference to them.
634 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
635 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
636 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
637 #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
639 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
640 #ifdef NODE_NOT_IN_PAGE_FLAGS
641 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
642 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
643 SECTIONS_PGOFF : ZONES_PGOFF)
645 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
646 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
647 NODES_PGOFF : ZONES_PGOFF)
650 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
652 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
653 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
656 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
657 #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
658 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
659 #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
660 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
662 static inline enum zone_type
page_zonenum(const struct page
*page
)
664 return (page
->flags
>> ZONES_PGSHIFT
) & ZONES_MASK
;
667 #ifdef CONFIG_ZONE_DEVICE
668 void get_zone_device_page(struct page
*page
);
669 void put_zone_device_page(struct page
*page
);
670 static inline bool is_zone_device_page(const struct page
*page
)
672 return page_zonenum(page
) == ZONE_DEVICE
;
675 static inline void get_zone_device_page(struct page
*page
)
678 static inline void put_zone_device_page(struct page
*page
)
681 static inline bool is_zone_device_page(const struct page
*page
)
687 static inline void get_page(struct page
*page
)
689 page
= compound_head(page
);
691 * Getting a normal page or the head of a compound page
692 * requires to already have an elevated page->_count.
694 VM_BUG_ON_PAGE(atomic_read(&page
->_count
) <= 0, page
);
695 atomic_inc(&page
->_count
);
697 if (unlikely(is_zone_device_page(page
)))
698 get_zone_device_page(page
);
701 static inline void put_page(struct page
*page
)
703 page
= compound_head(page
);
705 if (put_page_testzero(page
))
708 if (unlikely(is_zone_device_page(page
)))
709 put_zone_device_page(page
);
712 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
713 #define SECTION_IN_PAGE_FLAGS
717 * The identification function is mainly used by the buddy allocator for
718 * determining if two pages could be buddies. We are not really identifying
719 * the zone since we could be using the section number id if we do not have
720 * node id available in page flags.
721 * We only guarantee that it will return the same value for two combinable
724 static inline int page_zone_id(struct page
*page
)
726 return (page
->flags
>> ZONEID_PGSHIFT
) & ZONEID_MASK
;
729 static inline int zone_to_nid(struct zone
*zone
)
738 #ifdef NODE_NOT_IN_PAGE_FLAGS
739 extern int page_to_nid(const struct page
*page
);
741 static inline int page_to_nid(const struct page
*page
)
743 return (page
->flags
>> NODES_PGSHIFT
) & NODES_MASK
;
747 #ifdef CONFIG_NUMA_BALANCING
748 static inline int cpu_pid_to_cpupid(int cpu
, int pid
)
750 return ((cpu
& LAST__CPU_MASK
) << LAST__PID_SHIFT
) | (pid
& LAST__PID_MASK
);
753 static inline int cpupid_to_pid(int cpupid
)
755 return cpupid
& LAST__PID_MASK
;
758 static inline int cpupid_to_cpu(int cpupid
)
760 return (cpupid
>> LAST__PID_SHIFT
) & LAST__CPU_MASK
;
763 static inline int cpupid_to_nid(int cpupid
)
765 return cpu_to_node(cpupid_to_cpu(cpupid
));
768 static inline bool cpupid_pid_unset(int cpupid
)
770 return cpupid_to_pid(cpupid
) == (-1 & LAST__PID_MASK
);
773 static inline bool cpupid_cpu_unset(int cpupid
)
775 return cpupid_to_cpu(cpupid
) == (-1 & LAST__CPU_MASK
);
778 static inline bool __cpupid_match_pid(pid_t task_pid
, int cpupid
)
780 return (task_pid
& LAST__PID_MASK
) == cpupid_to_pid(cpupid
);
783 #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
784 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
785 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
787 return xchg(&page
->_last_cpupid
, cpupid
& LAST_CPUPID_MASK
);
790 static inline int page_cpupid_last(struct page
*page
)
792 return page
->_last_cpupid
;
794 static inline void page_cpupid_reset_last(struct page
*page
)
796 page
->_last_cpupid
= -1 & LAST_CPUPID_MASK
;
799 static inline int page_cpupid_last(struct page
*page
)
801 return (page
->flags
>> LAST_CPUPID_PGSHIFT
) & LAST_CPUPID_MASK
;
804 extern int page_cpupid_xchg_last(struct page
*page
, int cpupid
);
806 static inline void page_cpupid_reset_last(struct page
*page
)
808 int cpupid
= (1 << LAST_CPUPID_SHIFT
) - 1;
810 page
->flags
&= ~(LAST_CPUPID_MASK
<< LAST_CPUPID_PGSHIFT
);
811 page
->flags
|= (cpupid
& LAST_CPUPID_MASK
) << LAST_CPUPID_PGSHIFT
;
813 #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
814 #else /* !CONFIG_NUMA_BALANCING */
815 static inline int page_cpupid_xchg_last(struct page
*page
, int cpupid
)
817 return page_to_nid(page
); /* XXX */
820 static inline int page_cpupid_last(struct page
*page
)
822 return page_to_nid(page
); /* XXX */
825 static inline int cpupid_to_nid(int cpupid
)
830 static inline int cpupid_to_pid(int cpupid
)
835 static inline int cpupid_to_cpu(int cpupid
)
840 static inline int cpu_pid_to_cpupid(int nid
, int pid
)
845 static inline bool cpupid_pid_unset(int cpupid
)
850 static inline void page_cpupid_reset_last(struct page
*page
)
854 static inline bool cpupid_match_pid(struct task_struct
*task
, int cpupid
)
858 #endif /* CONFIG_NUMA_BALANCING */
860 static inline struct zone
*page_zone(const struct page
*page
)
862 return &NODE_DATA(page_to_nid(page
))->node_zones
[page_zonenum(page
)];
865 #ifdef SECTION_IN_PAGE_FLAGS
866 static inline void set_page_section(struct page
*page
, unsigned long section
)
868 page
->flags
&= ~(SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
869 page
->flags
|= (section
& SECTIONS_MASK
) << SECTIONS_PGSHIFT
;
872 static inline unsigned long page_to_section(const struct page
*page
)
874 return (page
->flags
>> SECTIONS_PGSHIFT
) & SECTIONS_MASK
;
878 static inline void set_page_zone(struct page
*page
, enum zone_type zone
)
880 page
->flags
&= ~(ZONES_MASK
<< ZONES_PGSHIFT
);
881 page
->flags
|= (zone
& ZONES_MASK
) << ZONES_PGSHIFT
;
884 static inline void set_page_node(struct page
*page
, unsigned long node
)
886 page
->flags
&= ~(NODES_MASK
<< NODES_PGSHIFT
);
887 page
->flags
|= (node
& NODES_MASK
) << NODES_PGSHIFT
;
890 static inline void set_page_links(struct page
*page
, enum zone_type zone
,
891 unsigned long node
, unsigned long pfn
)
893 set_page_zone(page
, zone
);
894 set_page_node(page
, node
);
895 #ifdef SECTION_IN_PAGE_FLAGS
896 set_page_section(page
, pfn_to_section_nr(pfn
));
901 static inline struct mem_cgroup
*page_memcg(struct page
*page
)
903 return page
->mem_cgroup
;
906 static inline void set_page_memcg(struct page
*page
, struct mem_cgroup
*memcg
)
908 page
->mem_cgroup
= memcg
;
911 static inline struct mem_cgroup
*page_memcg(struct page
*page
)
916 static inline void set_page_memcg(struct page
*page
, struct mem_cgroup
*memcg
)
922 * Some inline functions in vmstat.h depend on page_zone()
924 #include <linux/vmstat.h>
926 static __always_inline
void *lowmem_page_address(const struct page
*page
)
928 return __va(PFN_PHYS(page_to_pfn(page
)));
931 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
932 #define HASHED_PAGE_VIRTUAL
935 #if defined(WANT_PAGE_VIRTUAL)
936 static inline void *page_address(const struct page
*page
)
938 return page
->virtual;
940 static inline void set_page_address(struct page
*page
, void *address
)
942 page
->virtual = address
;
944 #define page_address_init() do { } while(0)
947 #if defined(HASHED_PAGE_VIRTUAL)
948 void *page_address(const struct page
*page
);
949 void set_page_address(struct page
*page
, void *virtual);
950 void page_address_init(void);
953 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
954 #define page_address(page) lowmem_page_address(page)
955 #define set_page_address(page, address) do { } while(0)
956 #define page_address_init() do { } while(0)
959 extern void *page_rmapping(struct page
*page
);
960 extern struct anon_vma
*page_anon_vma(struct page
*page
);
961 extern struct address_space
*page_mapping(struct page
*page
);
963 extern struct address_space
*__page_file_mapping(struct page
*);
966 struct address_space
*page_file_mapping(struct page
*page
)
968 if (unlikely(PageSwapCache(page
)))
969 return __page_file_mapping(page
);
971 return page
->mapping
;
975 * Return the pagecache index of the passed page. Regular pagecache pages
976 * use ->index whereas swapcache pages use ->private
978 static inline pgoff_t
page_index(struct page
*page
)
980 if (unlikely(PageSwapCache(page
)))
981 return page_private(page
);
985 extern pgoff_t
__page_file_index(struct page
*page
);
988 * Return the file index of the page. Regular pagecache pages use ->index
989 * whereas swapcache pages use swp_offset(->private)
991 static inline pgoff_t
page_file_index(struct page
*page
)
993 if (unlikely(PageSwapCache(page
)))
994 return __page_file_index(page
);
1000 * Return true if this page is mapped into pagetables.
1001 * For compound page it returns true if any subpage of compound page is mapped.
1003 static inline bool page_mapped(struct page
*page
)
1006 if (likely(!PageCompound(page
)))
1007 return atomic_read(&page
->_mapcount
) >= 0;
1008 page
= compound_head(page
);
1009 if (atomic_read(compound_mapcount_ptr(page
)) >= 0)
1011 for (i
= 0; i
< hpage_nr_pages(page
); i
++) {
1012 if (atomic_read(&page
[i
]._mapcount
) >= 0)
1019 * Return true only if the page has been allocated with
1020 * ALLOC_NO_WATERMARKS and the low watermark was not
1021 * met implying that the system is under some pressure.
1023 static inline bool page_is_pfmemalloc(struct page
*page
)
1026 * Page index cannot be this large so this must be
1027 * a pfmemalloc page.
1029 return page
->index
== -1UL;
1033 * Only to be called by the page allocator on a freshly allocated
1036 static inline void set_page_pfmemalloc(struct page
*page
)
1041 static inline void clear_page_pfmemalloc(struct page
*page
)
1047 * Different kinds of faults, as returned by handle_mm_fault().
1048 * Used to decide whether a process gets delivered SIGBUS or
1049 * just gets major/minor fault counters bumped up.
1052 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
1054 #define VM_FAULT_OOM 0x0001
1055 #define VM_FAULT_SIGBUS 0x0002
1056 #define VM_FAULT_MAJOR 0x0004
1057 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
1058 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
1059 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
1060 #define VM_FAULT_SIGSEGV 0x0040
1062 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
1063 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
1064 #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
1065 #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
1067 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
1069 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
1070 VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
1073 /* Encode hstate index for a hwpoisoned large page */
1074 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
1075 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
1078 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
1080 extern void pagefault_out_of_memory(void);
1082 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
1085 * Flags passed to show_mem() and show_free_areas() to suppress output in
1088 #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
1090 extern void show_free_areas(unsigned int flags
);
1091 extern bool skip_free_areas_node(unsigned int flags
, int nid
);
1093 int shmem_zero_setup(struct vm_area_struct
*);
1095 bool shmem_mapping(struct address_space
*mapping
);
1097 static inline bool shmem_mapping(struct address_space
*mapping
)
1103 extern bool can_do_mlock(void);
1104 extern int user_shm_lock(size_t, struct user_struct
*);
1105 extern void user_shm_unlock(size_t, struct user_struct
*);
1108 * Parameter block passed down to zap_pte_range in exceptional cases.
1110 struct zap_details
{
1111 struct address_space
*check_mapping
; /* Check page->mapping if set */
1112 pgoff_t first_index
; /* Lowest page->index to unmap */
1113 pgoff_t last_index
; /* Highest page->index to unmap */
1116 struct page
*vm_normal_page(struct vm_area_struct
*vma
, unsigned long addr
,
1119 int zap_vma_ptes(struct vm_area_struct
*vma
, unsigned long address
,
1120 unsigned long size
);
1121 void zap_page_range(struct vm_area_struct
*vma
, unsigned long address
,
1122 unsigned long size
, struct zap_details
*);
1123 void unmap_vmas(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
1124 unsigned long start
, unsigned long end
);
1127 * mm_walk - callbacks for walk_page_range
1128 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1129 * this handler is required to be able to handle
1130 * pmd_trans_huge() pmds. They may simply choose to
1131 * split_huge_page() instead of handling it explicitly.
1132 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1133 * @pte_hole: if set, called for each hole at all levels
1134 * @hugetlb_entry: if set, called for each hugetlb entry
1135 * @test_walk: caller specific callback function to determine whether
1136 * we walk over the current vma or not. A positive returned
1137 * value means "do page table walk over the current vma,"
1138 * and a negative one means "abort current page table walk
1139 * right now." 0 means "skip the current vma."
1140 * @mm: mm_struct representing the target process of page table walk
1141 * @vma: vma currently walked (NULL if walking outside vmas)
1142 * @private: private data for callbacks' usage
1144 * (see the comment on walk_page_range() for more details)
1147 int (*pmd_entry
)(pmd_t
*pmd
, unsigned long addr
,
1148 unsigned long next
, struct mm_walk
*walk
);
1149 int (*pte_entry
)(pte_t
*pte
, unsigned long addr
,
1150 unsigned long next
, struct mm_walk
*walk
);
1151 int (*pte_hole
)(unsigned long addr
, unsigned long next
,
1152 struct mm_walk
*walk
);
1153 int (*hugetlb_entry
)(pte_t
*pte
, unsigned long hmask
,
1154 unsigned long addr
, unsigned long next
,
1155 struct mm_walk
*walk
);
1156 int (*test_walk
)(unsigned long addr
, unsigned long next
,
1157 struct mm_walk
*walk
);
1158 struct mm_struct
*mm
;
1159 struct vm_area_struct
*vma
;
1163 int walk_page_range(unsigned long addr
, unsigned long end
,
1164 struct mm_walk
*walk
);
1165 int walk_page_vma(struct vm_area_struct
*vma
, struct mm_walk
*walk
);
1166 void free_pgd_range(struct mmu_gather
*tlb
, unsigned long addr
,
1167 unsigned long end
, unsigned long floor
, unsigned long ceiling
);
1168 int copy_page_range(struct mm_struct
*dst
, struct mm_struct
*src
,
1169 struct vm_area_struct
*vma
);
1170 void unmap_mapping_range(struct address_space
*mapping
,
1171 loff_t
const holebegin
, loff_t
const holelen
, int even_cows
);
1172 int follow_pfn(struct vm_area_struct
*vma
, unsigned long address
,
1173 unsigned long *pfn
);
1174 int follow_phys(struct vm_area_struct
*vma
, unsigned long address
,
1175 unsigned int flags
, unsigned long *prot
, resource_size_t
*phys
);
1176 int generic_access_phys(struct vm_area_struct
*vma
, unsigned long addr
,
1177 void *buf
, int len
, int write
);
1179 static inline void unmap_shared_mapping_range(struct address_space
*mapping
,
1180 loff_t
const holebegin
, loff_t
const holelen
)
1182 unmap_mapping_range(mapping
, holebegin
, holelen
, 0);
1185 extern void truncate_pagecache(struct inode
*inode
, loff_t
new);
1186 extern void truncate_setsize(struct inode
*inode
, loff_t newsize
);
1187 void pagecache_isize_extended(struct inode
*inode
, loff_t from
, loff_t to
);
1188 void truncate_pagecache_range(struct inode
*inode
, loff_t offset
, loff_t end
);
1189 int truncate_inode_page(struct address_space
*mapping
, struct page
*page
);
1190 int generic_error_remove_page(struct address_space
*mapping
, struct page
*page
);
1191 int invalidate_inode_page(struct page
*page
);
1194 extern int handle_mm_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1195 unsigned long address
, unsigned int flags
);
1196 extern int fixup_user_fault(struct task_struct
*tsk
, struct mm_struct
*mm
,
1197 unsigned long address
, unsigned int fault_flags
,
1200 static inline int handle_mm_fault(struct mm_struct
*mm
,
1201 struct vm_area_struct
*vma
, unsigned long address
,
1204 /* should never happen if there's no MMU */
1206 return VM_FAULT_SIGBUS
;
1208 static inline int fixup_user_fault(struct task_struct
*tsk
,
1209 struct mm_struct
*mm
, unsigned long address
,
1210 unsigned int fault_flags
, bool *unlocked
)
1212 /* should never happen if there's no MMU */
1218 extern int access_process_vm(struct task_struct
*tsk
, unsigned long addr
, void *buf
, int len
, int write
);
1219 extern int access_remote_vm(struct mm_struct
*mm
, unsigned long addr
,
1220 void *buf
, int len
, int write
);
1222 long __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1223 unsigned long start
, unsigned long nr_pages
,
1224 unsigned int foll_flags
, struct page
**pages
,
1225 struct vm_area_struct
**vmas
, int *nonblocking
);
1226 long get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
1227 unsigned long start
, unsigned long nr_pages
,
1228 int write
, int force
, struct page
**pages
,
1229 struct vm_area_struct
**vmas
);
1230 long get_user_pages_locked(struct task_struct
*tsk
, struct mm_struct
*mm
,
1231 unsigned long start
, unsigned long nr_pages
,
1232 int write
, int force
, struct page
**pages
,
1234 long __get_user_pages_unlocked(struct task_struct
*tsk
, struct mm_struct
*mm
,
1235 unsigned long start
, unsigned long nr_pages
,
1236 int write
, int force
, struct page
**pages
,
1237 unsigned int gup_flags
);
1238 long get_user_pages_unlocked(struct task_struct
*tsk
, struct mm_struct
*mm
,
1239 unsigned long start
, unsigned long nr_pages
,
1240 int write
, int force
, struct page
**pages
);
1241 int get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1242 struct page
**pages
);
1244 /* Container for pinned pfns / pages */
1245 struct frame_vector
{
1246 unsigned int nr_allocated
; /* Number of frames we have space for */
1247 unsigned int nr_frames
; /* Number of frames stored in ptrs array */
1248 bool got_ref
; /* Did we pin pages by getting page ref? */
1249 bool is_pfns
; /* Does array contain pages or pfns? */
1250 void *ptrs
[0]; /* Array of pinned pfns / pages. Use
1251 * pfns_vector_pages() or pfns_vector_pfns()
1255 struct frame_vector
*frame_vector_create(unsigned int nr_frames
);
1256 void frame_vector_destroy(struct frame_vector
*vec
);
1257 int get_vaddr_frames(unsigned long start
, unsigned int nr_pfns
,
1258 bool write
, bool force
, struct frame_vector
*vec
);
1259 void put_vaddr_frames(struct frame_vector
*vec
);
1260 int frame_vector_to_pages(struct frame_vector
*vec
);
1261 void frame_vector_to_pfns(struct frame_vector
*vec
);
1263 static inline unsigned int frame_vector_count(struct frame_vector
*vec
)
1265 return vec
->nr_frames
;
1268 static inline struct page
**frame_vector_pages(struct frame_vector
*vec
)
1271 int err
= frame_vector_to_pages(vec
);
1274 return ERR_PTR(err
);
1276 return (struct page
**)(vec
->ptrs
);
1279 static inline unsigned long *frame_vector_pfns(struct frame_vector
*vec
)
1282 frame_vector_to_pfns(vec
);
1283 return (unsigned long *)(vec
->ptrs
);
1287 int get_kernel_pages(const struct kvec
*iov
, int nr_pages
, int write
,
1288 struct page
**pages
);
1289 int get_kernel_page(unsigned long start
, int write
, struct page
**pages
);
1290 struct page
*get_dump_page(unsigned long addr
);
1292 extern int try_to_release_page(struct page
* page
, gfp_t gfp_mask
);
1293 extern void do_invalidatepage(struct page
*page
, unsigned int offset
,
1294 unsigned int length
);
1296 int __set_page_dirty_nobuffers(struct page
*page
);
1297 int __set_page_dirty_no_writeback(struct page
*page
);
1298 int redirty_page_for_writepage(struct writeback_control
*wbc
,
1300 void account_page_dirtied(struct page
*page
, struct address_space
*mapping
,
1301 struct mem_cgroup
*memcg
);
1302 void account_page_cleaned(struct page
*page
, struct address_space
*mapping
,
1303 struct mem_cgroup
*memcg
, struct bdi_writeback
*wb
);
1304 int set_page_dirty(struct page
*page
);
1305 int set_page_dirty_lock(struct page
*page
);
1306 void cancel_dirty_page(struct page
*page
);
1307 int clear_page_dirty_for_io(struct page
*page
);
1309 int get_cmdline(struct task_struct
*task
, char *buffer
, int buflen
);
1311 /* Is the vma a continuation of the stack vma above it? */
1312 static inline int vma_growsdown(struct vm_area_struct
*vma
, unsigned long addr
)
1314 return vma
&& (vma
->vm_end
== addr
) && (vma
->vm_flags
& VM_GROWSDOWN
);
1317 static inline bool vma_is_anonymous(struct vm_area_struct
*vma
)
1319 return !vma
->vm_ops
;
1322 static inline int stack_guard_page_start(struct vm_area_struct
*vma
,
1325 return (vma
->vm_flags
& VM_GROWSDOWN
) &&
1326 (vma
->vm_start
== addr
) &&
1327 !vma_growsdown(vma
->vm_prev
, addr
);
1330 /* Is the vma a continuation of the stack vma below it? */
1331 static inline int vma_growsup(struct vm_area_struct
*vma
, unsigned long addr
)
1333 return vma
&& (vma
->vm_start
== addr
) && (vma
->vm_flags
& VM_GROWSUP
);
1336 static inline int stack_guard_page_end(struct vm_area_struct
*vma
,
1339 return (vma
->vm_flags
& VM_GROWSUP
) &&
1340 (vma
->vm_end
== addr
) &&
1341 !vma_growsup(vma
->vm_next
, addr
);
1344 extern struct task_struct
*task_of_stack(struct task_struct
*task
,
1345 struct vm_area_struct
*vma
, bool in_group
);
1347 extern unsigned long move_page_tables(struct vm_area_struct
*vma
,
1348 unsigned long old_addr
, struct vm_area_struct
*new_vma
,
1349 unsigned long new_addr
, unsigned long len
,
1350 bool need_rmap_locks
);
1351 extern unsigned long change_protection(struct vm_area_struct
*vma
, unsigned long start
,
1352 unsigned long end
, pgprot_t newprot
,
1353 int dirty_accountable
, int prot_numa
);
1354 extern int mprotect_fixup(struct vm_area_struct
*vma
,
1355 struct vm_area_struct
**pprev
, unsigned long start
,
1356 unsigned long end
, unsigned long newflags
);
1359 * doesn't attempt to fault and will return short.
1361 int __get_user_pages_fast(unsigned long start
, int nr_pages
, int write
,
1362 struct page
**pages
);
1364 * per-process(per-mm_struct) statistics.
1366 static inline unsigned long get_mm_counter(struct mm_struct
*mm
, int member
)
1368 long val
= atomic_long_read(&mm
->rss_stat
.count
[member
]);
1370 #ifdef SPLIT_RSS_COUNTING
1372 * counter is updated in asynchronous manner and may go to minus.
1373 * But it's never be expected number for users.
1378 return (unsigned long)val
;
1381 static inline void add_mm_counter(struct mm_struct
*mm
, int member
, long value
)
1383 atomic_long_add(value
, &mm
->rss_stat
.count
[member
]);
1386 static inline void inc_mm_counter(struct mm_struct
*mm
, int member
)
1388 atomic_long_inc(&mm
->rss_stat
.count
[member
]);
1391 static inline void dec_mm_counter(struct mm_struct
*mm
, int member
)
1393 atomic_long_dec(&mm
->rss_stat
.count
[member
]);
1396 /* Optimized variant when page is already known not to be PageAnon */
1397 static inline int mm_counter_file(struct page
*page
)
1399 if (PageSwapBacked(page
))
1400 return MM_SHMEMPAGES
;
1401 return MM_FILEPAGES
;
1404 static inline int mm_counter(struct page
*page
)
1407 return MM_ANONPAGES
;
1408 return mm_counter_file(page
);
1411 static inline unsigned long get_mm_rss(struct mm_struct
*mm
)
1413 return get_mm_counter(mm
, MM_FILEPAGES
) +
1414 get_mm_counter(mm
, MM_ANONPAGES
) +
1415 get_mm_counter(mm
, MM_SHMEMPAGES
);
1418 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
1420 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
1423 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
1425 return max(mm
->hiwater_vm
, mm
->total_vm
);
1428 static inline void update_hiwater_rss(struct mm_struct
*mm
)
1430 unsigned long _rss
= get_mm_rss(mm
);
1432 if ((mm
)->hiwater_rss
< _rss
)
1433 (mm
)->hiwater_rss
= _rss
;
1436 static inline void update_hiwater_vm(struct mm_struct
*mm
)
1438 if (mm
->hiwater_vm
< mm
->total_vm
)
1439 mm
->hiwater_vm
= mm
->total_vm
;
1442 static inline void reset_mm_hiwater_rss(struct mm_struct
*mm
)
1444 mm
->hiwater_rss
= get_mm_rss(mm
);
1447 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss
,
1448 struct mm_struct
*mm
)
1450 unsigned long hiwater_rss
= get_mm_hiwater_rss(mm
);
1452 if (*maxrss
< hiwater_rss
)
1453 *maxrss
= hiwater_rss
;
1456 #if defined(SPLIT_RSS_COUNTING)
1457 void sync_mm_rss(struct mm_struct
*mm
);
1459 static inline void sync_mm_rss(struct mm_struct
*mm
)
1464 #ifndef __HAVE_ARCH_PTE_DEVMAP
1465 static inline int pte_devmap(pte_t pte
)
1471 int vma_wants_writenotify(struct vm_area_struct
*vma
);
1473 extern pte_t
*__get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1475 static inline pte_t
*get_locked_pte(struct mm_struct
*mm
, unsigned long addr
,
1479 __cond_lock(*ptl
, ptep
= __get_locked_pte(mm
, addr
, ptl
));
1483 #ifdef __PAGETABLE_PUD_FOLDED
1484 static inline int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
,
1485 unsigned long address
)
1490 int __pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
);
1493 #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
1494 static inline int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
,
1495 unsigned long address
)
1500 static inline void mm_nr_pmds_init(struct mm_struct
*mm
) {}
1502 static inline unsigned long mm_nr_pmds(struct mm_struct
*mm
)
1507 static inline void mm_inc_nr_pmds(struct mm_struct
*mm
) {}
1508 static inline void mm_dec_nr_pmds(struct mm_struct
*mm
) {}
1511 int __pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
);
1513 static inline void mm_nr_pmds_init(struct mm_struct
*mm
)
1515 atomic_long_set(&mm
->nr_pmds
, 0);
1518 static inline unsigned long mm_nr_pmds(struct mm_struct
*mm
)
1520 return atomic_long_read(&mm
->nr_pmds
);
1523 static inline void mm_inc_nr_pmds(struct mm_struct
*mm
)
1525 atomic_long_inc(&mm
->nr_pmds
);
1528 static inline void mm_dec_nr_pmds(struct mm_struct
*mm
)
1530 atomic_long_dec(&mm
->nr_pmds
);
1534 int __pte_alloc(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
1535 pmd_t
*pmd
, unsigned long address
);
1536 int __pte_alloc_kernel(pmd_t
*pmd
, unsigned long address
);
1539 * The following ifdef needed to get the 4level-fixup.h header to work.
1540 * Remove it when 4level-fixup.h has been removed.
1542 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1543 static inline pud_t
*pud_alloc(struct mm_struct
*mm
, pgd_t
*pgd
, unsigned long address
)
1545 return (unlikely(pgd_none(*pgd
)) && __pud_alloc(mm
, pgd
, address
))?
1546 NULL
: pud_offset(pgd
, address
);
1549 static inline pmd_t
*pmd_alloc(struct mm_struct
*mm
, pud_t
*pud
, unsigned long address
)
1551 return (unlikely(pud_none(*pud
)) && __pmd_alloc(mm
, pud
, address
))?
1552 NULL
: pmd_offset(pud
, address
);
1554 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1556 #if USE_SPLIT_PTE_PTLOCKS
1557 #if ALLOC_SPLIT_PTLOCKS
1558 void __init
ptlock_cache_init(void);
1559 extern bool ptlock_alloc(struct page
*page
);
1560 extern void ptlock_free(struct page
*page
);
1562 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1566 #else /* ALLOC_SPLIT_PTLOCKS */
1567 static inline void ptlock_cache_init(void)
1571 static inline bool ptlock_alloc(struct page
*page
)
1576 static inline void ptlock_free(struct page
*page
)
1580 static inline spinlock_t
*ptlock_ptr(struct page
*page
)
1584 #endif /* ALLOC_SPLIT_PTLOCKS */
1586 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1588 return ptlock_ptr(pmd_page(*pmd
));
1591 static inline bool ptlock_init(struct page
*page
)
1594 * prep_new_page() initialize page->private (and therefore page->ptl)
1595 * with 0. Make sure nobody took it in use in between.
1597 * It can happen if arch try to use slab for page table allocation:
1598 * slab code uses page->slab_cache, which share storage with page->ptl.
1600 VM_BUG_ON_PAGE(*(unsigned long *)&page
->ptl
, page
);
1601 if (!ptlock_alloc(page
))
1603 spin_lock_init(ptlock_ptr(page
));
1607 /* Reset page->mapping so free_pages_check won't complain. */
1608 static inline void pte_lock_deinit(struct page
*page
)
1610 page
->mapping
= NULL
;
1614 #else /* !USE_SPLIT_PTE_PTLOCKS */
1616 * We use mm->page_table_lock to guard all pagetable pages of the mm.
1618 static inline spinlock_t
*pte_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1620 return &mm
->page_table_lock
;
1622 static inline void ptlock_cache_init(void) {}
1623 static inline bool ptlock_init(struct page
*page
) { return true; }
1624 static inline void pte_lock_deinit(struct page
*page
) {}
1625 #endif /* USE_SPLIT_PTE_PTLOCKS */
1627 static inline void pgtable_init(void)
1629 ptlock_cache_init();
1630 pgtable_cache_init();
1633 static inline bool pgtable_page_ctor(struct page
*page
)
1635 if (!ptlock_init(page
))
1637 inc_zone_page_state(page
, NR_PAGETABLE
);
1641 static inline void pgtable_page_dtor(struct page
*page
)
1643 pte_lock_deinit(page
);
1644 dec_zone_page_state(page
, NR_PAGETABLE
);
1647 #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1649 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1650 pte_t *__pte = pte_offset_map(pmd, address); \
1656 #define pte_unmap_unlock(pte, ptl) do { \
1661 #define pte_alloc_map(mm, vma, pmd, address) \
1662 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1664 NULL: pte_offset_map(pmd, address))
1666 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1667 ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1669 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1671 #define pte_alloc_kernel(pmd, address) \
1672 ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1673 NULL: pte_offset_kernel(pmd, address))
1675 #if USE_SPLIT_PMD_PTLOCKS
1677 static struct page
*pmd_to_page(pmd_t
*pmd
)
1679 unsigned long mask
= ~(PTRS_PER_PMD
* sizeof(pmd_t
) - 1);
1680 return virt_to_page((void *)((unsigned long) pmd
& mask
));
1683 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1685 return ptlock_ptr(pmd_to_page(pmd
));
1688 static inline bool pgtable_pmd_page_ctor(struct page
*page
)
1690 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1691 page
->pmd_huge_pte
= NULL
;
1693 return ptlock_init(page
);
1696 static inline void pgtable_pmd_page_dtor(struct page
*page
)
1698 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1699 VM_BUG_ON_PAGE(page
->pmd_huge_pte
, page
);
1704 #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
1708 static inline spinlock_t
*pmd_lockptr(struct mm_struct
*mm
, pmd_t
*pmd
)
1710 return &mm
->page_table_lock
;
1713 static inline bool pgtable_pmd_page_ctor(struct page
*page
) { return true; }
1714 static inline void pgtable_pmd_page_dtor(struct page
*page
) {}
1716 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1720 static inline spinlock_t
*pmd_lock(struct mm_struct
*mm
, pmd_t
*pmd
)
1722 spinlock_t
*ptl
= pmd_lockptr(mm
, pmd
);
1727 extern void free_area_init(unsigned long * zones_size
);
1728 extern void free_area_init_node(int nid
, unsigned long * zones_size
,
1729 unsigned long zone_start_pfn
, unsigned long *zholes_size
);
1730 extern void free_initmem(void);
1733 * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1734 * into the buddy system. The freed pages will be poisoned with pattern
1735 * "poison" if it's within range [0, UCHAR_MAX].
1736 * Return pages freed into the buddy system.
1738 extern unsigned long free_reserved_area(void *start
, void *end
,
1739 int poison
, char *s
);
1741 #ifdef CONFIG_HIGHMEM
1743 * Free a highmem page into the buddy system, adjusting totalhigh_pages
1744 * and totalram_pages.
1746 extern void free_highmem_page(struct page
*page
);
1749 extern void adjust_managed_page_count(struct page
*page
, long count
);
1750 extern void mem_init_print_info(const char *str
);
1752 extern void reserve_bootmem_region(unsigned long start
, unsigned long end
);
1754 /* Free the reserved page into the buddy system, so it gets managed. */
1755 static inline void __free_reserved_page(struct page
*page
)
1757 ClearPageReserved(page
);
1758 init_page_count(page
);
1762 static inline void free_reserved_page(struct page
*page
)
1764 __free_reserved_page(page
);
1765 adjust_managed_page_count(page
, 1);
1768 static inline void mark_page_reserved(struct page
*page
)
1770 SetPageReserved(page
);
1771 adjust_managed_page_count(page
, -1);
1775 * Default method to free all the __init memory into the buddy system.
1776 * The freed pages will be poisoned with pattern "poison" if it's within
1777 * range [0, UCHAR_MAX].
1778 * Return pages freed into the buddy system.
1780 static inline unsigned long free_initmem_default(int poison
)
1782 extern char __init_begin
[], __init_end
[];
1784 return free_reserved_area(&__init_begin
, &__init_end
,
1785 poison
, "unused kernel");
1788 static inline unsigned long get_num_physpages(void)
1791 unsigned long phys_pages
= 0;
1793 for_each_online_node(nid
)
1794 phys_pages
+= node_present_pages(nid
);
1799 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1801 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1802 * zones, allocate the backing mem_map and account for memory holes in a more
1803 * architecture independent manner. This is a substitute for creating the
1804 * zone_sizes[] and zholes_size[] arrays and passing them to
1805 * free_area_init_node()
1807 * An architecture is expected to register range of page frames backed by
1808 * physical memory with memblock_add[_node]() before calling
1809 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1810 * usage, an architecture is expected to do something like
1812 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1814 * for_each_valid_physical_page_range()
1815 * memblock_add_node(base, size, nid)
1816 * free_area_init_nodes(max_zone_pfns);
1818 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1819 * registered physical page range. Similarly
1820 * sparse_memory_present_with_active_regions() calls memory_present() for
1821 * each range when SPARSEMEM is enabled.
1823 * See mm/page_alloc.c for more information on each function exposed by
1824 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1826 extern void free_area_init_nodes(unsigned long *max_zone_pfn
);
1827 unsigned long node_map_pfn_alignment(void);
1828 unsigned long __absent_pages_in_range(int nid
, unsigned long start_pfn
,
1829 unsigned long end_pfn
);
1830 extern unsigned long absent_pages_in_range(unsigned long start_pfn
,
1831 unsigned long end_pfn
);
1832 extern void get_pfn_range_for_nid(unsigned int nid
,
1833 unsigned long *start_pfn
, unsigned long *end_pfn
);
1834 extern unsigned long find_min_pfn_with_active_regions(void);
1835 extern void free_bootmem_with_active_regions(int nid
,
1836 unsigned long max_low_pfn
);
1837 extern void sparse_memory_present_with_active_regions(int nid
);
1839 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1841 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1842 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1843 static inline int __early_pfn_to_nid(unsigned long pfn
,
1844 struct mminit_pfnnid_cache
*state
)
1849 /* please see mm/page_alloc.c */
1850 extern int __meminit
early_pfn_to_nid(unsigned long pfn
);
1851 /* there is a per-arch backend function. */
1852 extern int __meminit
__early_pfn_to_nid(unsigned long pfn
,
1853 struct mminit_pfnnid_cache
*state
);
1856 extern void set_dma_reserve(unsigned long new_dma_reserve
);
1857 extern void memmap_init_zone(unsigned long, int, unsigned long,
1858 unsigned long, enum memmap_context
);
1859 extern void setup_per_zone_wmarks(void);
1860 extern int __meminit
init_per_zone_wmark_min(void);
1861 extern void mem_init(void);
1862 extern void __init
mmap_init(void);
1863 extern void show_mem(unsigned int flags
);
1864 extern void si_meminfo(struct sysinfo
* val
);
1865 extern void si_meminfo_node(struct sysinfo
*val
, int nid
);
1867 extern __printf(3, 4)
1868 void warn_alloc_failed(gfp_t gfp_mask
, unsigned int order
,
1869 const char *fmt
, ...);
1871 extern void setup_per_cpu_pageset(void);
1873 extern void zone_pcp_update(struct zone
*zone
);
1874 extern void zone_pcp_reset(struct zone
*zone
);
1877 extern int min_free_kbytes
;
1880 extern atomic_long_t mmap_pages_allocated
;
1881 extern int nommu_shrink_inode_mappings(struct inode
*, size_t, size_t);
1883 /* interval_tree.c */
1884 void vma_interval_tree_insert(struct vm_area_struct
*node
,
1885 struct rb_root
*root
);
1886 void vma_interval_tree_insert_after(struct vm_area_struct
*node
,
1887 struct vm_area_struct
*prev
,
1888 struct rb_root
*root
);
1889 void vma_interval_tree_remove(struct vm_area_struct
*node
,
1890 struct rb_root
*root
);
1891 struct vm_area_struct
*vma_interval_tree_iter_first(struct rb_root
*root
,
1892 unsigned long start
, unsigned long last
);
1893 struct vm_area_struct
*vma_interval_tree_iter_next(struct vm_area_struct
*node
,
1894 unsigned long start
, unsigned long last
);
1896 #define vma_interval_tree_foreach(vma, root, start, last) \
1897 for (vma = vma_interval_tree_iter_first(root, start, last); \
1898 vma; vma = vma_interval_tree_iter_next(vma, start, last))
1900 void anon_vma_interval_tree_insert(struct anon_vma_chain
*node
,
1901 struct rb_root
*root
);
1902 void anon_vma_interval_tree_remove(struct anon_vma_chain
*node
,
1903 struct rb_root
*root
);
1904 struct anon_vma_chain
*anon_vma_interval_tree_iter_first(
1905 struct rb_root
*root
, unsigned long start
, unsigned long last
);
1906 struct anon_vma_chain
*anon_vma_interval_tree_iter_next(
1907 struct anon_vma_chain
*node
, unsigned long start
, unsigned long last
);
1908 #ifdef CONFIG_DEBUG_VM_RB
1909 void anon_vma_interval_tree_verify(struct anon_vma_chain
*node
);
1912 #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1913 for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1914 avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1917 extern int __vm_enough_memory(struct mm_struct
*mm
, long pages
, int cap_sys_admin
);
1918 extern int vma_adjust(struct vm_area_struct
*vma
, unsigned long start
,
1919 unsigned long end
, pgoff_t pgoff
, struct vm_area_struct
*insert
);
1920 extern struct vm_area_struct
*vma_merge(struct mm_struct
*,
1921 struct vm_area_struct
*prev
, unsigned long addr
, unsigned long end
,
1922 unsigned long vm_flags
, struct anon_vma
*, struct file
*, pgoff_t
,
1923 struct mempolicy
*, struct vm_userfaultfd_ctx
);
1924 extern struct anon_vma
*find_mergeable_anon_vma(struct vm_area_struct
*);
1925 extern int split_vma(struct mm_struct
*,
1926 struct vm_area_struct
*, unsigned long addr
, int new_below
);
1927 extern int insert_vm_struct(struct mm_struct
*, struct vm_area_struct
*);
1928 extern void __vma_link_rb(struct mm_struct
*, struct vm_area_struct
*,
1929 struct rb_node
**, struct rb_node
*);
1930 extern void unlink_file_vma(struct vm_area_struct
*);
1931 extern struct vm_area_struct
*copy_vma(struct vm_area_struct
**,
1932 unsigned long addr
, unsigned long len
, pgoff_t pgoff
,
1933 bool *need_rmap_locks
);
1934 extern void exit_mmap(struct mm_struct
*);
1936 static inline int check_data_rlimit(unsigned long rlim
,
1938 unsigned long start
,
1939 unsigned long end_data
,
1940 unsigned long start_data
)
1942 if (rlim
< RLIM_INFINITY
) {
1943 if (((new - start
) + (end_data
- start_data
)) > rlim
)
1950 extern int mm_take_all_locks(struct mm_struct
*mm
);
1951 extern void mm_drop_all_locks(struct mm_struct
*mm
);
1953 extern void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
);
1954 extern struct file
*get_mm_exe_file(struct mm_struct
*mm
);
1956 extern bool may_expand_vm(struct mm_struct
*, vm_flags_t
, unsigned long npages
);
1957 extern void vm_stat_account(struct mm_struct
*, vm_flags_t
, long npages
);
1959 extern struct vm_area_struct
*_install_special_mapping(struct mm_struct
*mm
,
1960 unsigned long addr
, unsigned long len
,
1961 unsigned long flags
,
1962 const struct vm_special_mapping
*spec
);
1963 /* This is an obsolete alternative to _install_special_mapping. */
1964 extern int install_special_mapping(struct mm_struct
*mm
,
1965 unsigned long addr
, unsigned long len
,
1966 unsigned long flags
, struct page
**pages
);
1968 extern unsigned long get_unmapped_area(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1970 extern unsigned long mmap_region(struct file
*file
, unsigned long addr
,
1971 unsigned long len
, vm_flags_t vm_flags
, unsigned long pgoff
);
1972 extern unsigned long do_mmap(struct file
*file
, unsigned long addr
,
1973 unsigned long len
, unsigned long prot
, unsigned long flags
,
1974 vm_flags_t vm_flags
, unsigned long pgoff
, unsigned long *populate
);
1975 extern int do_munmap(struct mm_struct
*, unsigned long, size_t);
1977 static inline unsigned long
1978 do_mmap_pgoff(struct file
*file
, unsigned long addr
,
1979 unsigned long len
, unsigned long prot
, unsigned long flags
,
1980 unsigned long pgoff
, unsigned long *populate
)
1982 return do_mmap(file
, addr
, len
, prot
, flags
, 0, pgoff
, populate
);
1986 extern int __mm_populate(unsigned long addr
, unsigned long len
,
1988 static inline void mm_populate(unsigned long addr
, unsigned long len
)
1991 (void) __mm_populate(addr
, len
, 1);
1994 static inline void mm_populate(unsigned long addr
, unsigned long len
) {}
1997 /* These take the mm semaphore themselves */
1998 extern unsigned long vm_brk(unsigned long, unsigned long);
1999 extern int vm_munmap(unsigned long, size_t);
2000 extern unsigned long vm_mmap(struct file
*, unsigned long,
2001 unsigned long, unsigned long,
2002 unsigned long, unsigned long);
2004 struct vm_unmapped_area_info
{
2005 #define VM_UNMAPPED_AREA_TOPDOWN 1
2006 unsigned long flags
;
2007 unsigned long length
;
2008 unsigned long low_limit
;
2009 unsigned long high_limit
;
2010 unsigned long align_mask
;
2011 unsigned long align_offset
;
2014 extern unsigned long unmapped_area(struct vm_unmapped_area_info
*info
);
2015 extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info
*info
);
2018 * Search for an unmapped address range.
2020 * We are looking for a range that:
2021 * - does not intersect with any VMA;
2022 * - is contained within the [low_limit, high_limit) interval;
2023 * - is at least the desired size.
2024 * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
2026 static inline unsigned long
2027 vm_unmapped_area(struct vm_unmapped_area_info
*info
)
2029 if (info
->flags
& VM_UNMAPPED_AREA_TOPDOWN
)
2030 return unmapped_area_topdown(info
);
2032 return unmapped_area(info
);
2036 extern void truncate_inode_pages(struct address_space
*, loff_t
);
2037 extern void truncate_inode_pages_range(struct address_space
*,
2038 loff_t lstart
, loff_t lend
);
2039 extern void truncate_inode_pages_final(struct address_space
*);
2041 /* generic vm_area_ops exported for stackable file systems */
2042 extern int filemap_fault(struct vm_area_struct
*, struct vm_fault
*);
2043 extern void filemap_map_pages(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
2044 extern int filemap_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
2046 /* mm/page-writeback.c */
2047 int write_one_page(struct page
*page
, int wait
);
2048 void task_dirty_inc(struct task_struct
*tsk
);
2051 #define VM_MAX_READAHEAD 128 /* kbytes */
2052 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
2054 int force_page_cache_readahead(struct address_space
*mapping
, struct file
*filp
,
2055 pgoff_t offset
, unsigned long nr_to_read
);
2057 void page_cache_sync_readahead(struct address_space
*mapping
,
2058 struct file_ra_state
*ra
,
2061 unsigned long size
);
2063 void page_cache_async_readahead(struct address_space
*mapping
,
2064 struct file_ra_state
*ra
,
2068 unsigned long size
);
2070 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
2071 extern int expand_stack(struct vm_area_struct
*vma
, unsigned long address
);
2073 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
2074 extern int expand_downwards(struct vm_area_struct
*vma
,
2075 unsigned long address
);
2077 extern int expand_upwards(struct vm_area_struct
*vma
, unsigned long address
);
2079 #define expand_upwards(vma, address) (0)
2082 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
2083 extern struct vm_area_struct
* find_vma(struct mm_struct
* mm
, unsigned long addr
);
2084 extern struct vm_area_struct
* find_vma_prev(struct mm_struct
* mm
, unsigned long addr
,
2085 struct vm_area_struct
**pprev
);
2087 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
2088 NULL if none. Assume start_addr < end_addr. */
2089 static inline struct vm_area_struct
* find_vma_intersection(struct mm_struct
* mm
, unsigned long start_addr
, unsigned long end_addr
)
2091 struct vm_area_struct
* vma
= find_vma(mm
,start_addr
);
2093 if (vma
&& end_addr
<= vma
->vm_start
)
2098 static inline unsigned long vma_pages(struct vm_area_struct
*vma
)
2100 return (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
2103 /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
2104 static inline struct vm_area_struct
*find_exact_vma(struct mm_struct
*mm
,
2105 unsigned long vm_start
, unsigned long vm_end
)
2107 struct vm_area_struct
*vma
= find_vma(mm
, vm_start
);
2109 if (vma
&& (vma
->vm_start
!= vm_start
|| vma
->vm_end
!= vm_end
))
2116 pgprot_t
vm_get_page_prot(unsigned long vm_flags
);
2117 void vma_set_page_prot(struct vm_area_struct
*vma
);
2119 static inline pgprot_t
vm_get_page_prot(unsigned long vm_flags
)
2123 static inline void vma_set_page_prot(struct vm_area_struct
*vma
)
2125 vma
->vm_page_prot
= vm_get_page_prot(vma
->vm_flags
);
2129 #ifdef CONFIG_NUMA_BALANCING
2130 unsigned long change_prot_numa(struct vm_area_struct
*vma
,
2131 unsigned long start
, unsigned long end
);
2134 struct vm_area_struct
*find_extend_vma(struct mm_struct
*, unsigned long addr
);
2135 int remap_pfn_range(struct vm_area_struct
*, unsigned long addr
,
2136 unsigned long pfn
, unsigned long size
, pgprot_t
);
2137 int vm_insert_page(struct vm_area_struct
*, unsigned long addr
, struct page
*);
2138 int vm_insert_pfn(struct vm_area_struct
*vma
, unsigned long addr
,
2140 int vm_insert_mixed(struct vm_area_struct
*vma
, unsigned long addr
,
2142 int vm_iomap_memory(struct vm_area_struct
*vma
, phys_addr_t start
, unsigned long len
);
2145 struct page
*follow_page_mask(struct vm_area_struct
*vma
,
2146 unsigned long address
, unsigned int foll_flags
,
2147 unsigned int *page_mask
);
2149 static inline struct page
*follow_page(struct vm_area_struct
*vma
,
2150 unsigned long address
, unsigned int foll_flags
)
2152 unsigned int unused_page_mask
;
2153 return follow_page_mask(vma
, address
, foll_flags
, &unused_page_mask
);
2156 #define FOLL_WRITE 0x01 /* check pte is writable */
2157 #define FOLL_TOUCH 0x02 /* mark page accessed */
2158 #define FOLL_GET 0x04 /* do get_page on page */
2159 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
2160 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
2161 #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
2162 * and return without waiting upon it */
2163 #define FOLL_POPULATE 0x40 /* fault in page */
2164 #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
2165 #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
2166 #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
2167 #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
2168 #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
2169 #define FOLL_MLOCK 0x1000 /* lock present pages */
2171 typedef int (*pte_fn_t
)(pte_t
*pte
, pgtable_t token
, unsigned long addr
,
2173 extern int apply_to_page_range(struct mm_struct
*mm
, unsigned long address
,
2174 unsigned long size
, pte_fn_t fn
, void *data
);
2177 #ifdef CONFIG_DEBUG_PAGEALLOC
2178 extern bool _debug_pagealloc_enabled
;
2179 extern void __kernel_map_pages(struct page
*page
, int numpages
, int enable
);
2181 static inline bool debug_pagealloc_enabled(void)
2183 return _debug_pagealloc_enabled
;
2187 kernel_map_pages(struct page
*page
, int numpages
, int enable
)
2189 if (!debug_pagealloc_enabled())
2192 __kernel_map_pages(page
, numpages
, enable
);
2194 #ifdef CONFIG_HIBERNATION
2195 extern bool kernel_page_present(struct page
*page
);
2196 #endif /* CONFIG_HIBERNATION */
2199 kernel_map_pages(struct page
*page
, int numpages
, int enable
) {}
2200 #ifdef CONFIG_HIBERNATION
2201 static inline bool kernel_page_present(struct page
*page
) { return true; }
2202 #endif /* CONFIG_HIBERNATION */
2205 #ifdef __HAVE_ARCH_GATE_AREA
2206 extern struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
);
2207 extern int in_gate_area_no_mm(unsigned long addr
);
2208 extern int in_gate_area(struct mm_struct
*mm
, unsigned long addr
);
2210 static inline struct vm_area_struct
*get_gate_vma(struct mm_struct
*mm
)
2214 static inline int in_gate_area_no_mm(unsigned long addr
) { return 0; }
2215 static inline int in_gate_area(struct mm_struct
*mm
, unsigned long addr
)
2219 #endif /* __HAVE_ARCH_GATE_AREA */
2221 #ifdef CONFIG_SYSCTL
2222 extern int sysctl_drop_caches
;
2223 int drop_caches_sysctl_handler(struct ctl_table
*, int,
2224 void __user
*, size_t *, loff_t
*);
2227 void drop_slab(void);
2228 void drop_slab_node(int nid
);
2231 #define randomize_va_space 0
2233 extern int randomize_va_space
;
2236 const char * arch_vma_name(struct vm_area_struct
*vma
);
2237 void print_vma_addr(char *prefix
, unsigned long rip
);
2239 void sparse_mem_maps_populate_node(struct page
**map_map
,
2240 unsigned long pnum_begin
,
2241 unsigned long pnum_end
,
2242 unsigned long map_count
,
2245 struct page
*sparse_mem_map_populate(unsigned long pnum
, int nid
);
2246 pgd_t
*vmemmap_pgd_populate(unsigned long addr
, int node
);
2247 pud_t
*vmemmap_pud_populate(pgd_t
*pgd
, unsigned long addr
, int node
);
2248 pmd_t
*vmemmap_pmd_populate(pud_t
*pud
, unsigned long addr
, int node
);
2249 pte_t
*vmemmap_pte_populate(pmd_t
*pmd
, unsigned long addr
, int node
);
2250 void *vmemmap_alloc_block(unsigned long size
, int node
);
2252 void *__vmemmap_alloc_block_buf(unsigned long size
, int node
,
2253 struct vmem_altmap
*altmap
);
2254 static inline void *vmemmap_alloc_block_buf(unsigned long size
, int node
)
2256 return __vmemmap_alloc_block_buf(size
, node
, NULL
);
2259 void vmemmap_verify(pte_t
*, int, unsigned long, unsigned long);
2260 int vmemmap_populate_basepages(unsigned long start
, unsigned long end
,
2262 int vmemmap_populate(unsigned long start
, unsigned long end
, int node
);
2263 void vmemmap_populate_print_last(void);
2264 #ifdef CONFIG_MEMORY_HOTPLUG
2265 void vmemmap_free(unsigned long start
, unsigned long end
);
2267 void register_page_bootmem_memmap(unsigned long section_nr
, struct page
*map
,
2268 unsigned long size
);
2271 MF_COUNT_INCREASED
= 1 << 0,
2272 MF_ACTION_REQUIRED
= 1 << 1,
2273 MF_MUST_KILL
= 1 << 2,
2274 MF_SOFT_OFFLINE
= 1 << 3,
2276 extern int memory_failure(unsigned long pfn
, int trapno
, int flags
);
2277 extern void memory_failure_queue(unsigned long pfn
, int trapno
, int flags
);
2278 extern int unpoison_memory(unsigned long pfn
);
2279 extern int get_hwpoison_page(struct page
*page
);
2280 #define put_hwpoison_page(page) put_page(page)
2281 extern int sysctl_memory_failure_early_kill
;
2282 extern int sysctl_memory_failure_recovery
;
2283 extern void shake_page(struct page
*p
, int access
);
2284 extern atomic_long_t num_poisoned_pages
;
2285 extern int soft_offline_page(struct page
*page
, int flags
);
2289 * Error handlers for various types of pages.
2292 MF_IGNORED
, /* Error: cannot be handled */
2293 MF_FAILED
, /* Error: handling failed */
2294 MF_DELAYED
, /* Will be handled later */
2295 MF_RECOVERED
, /* Successfully recovered */
2298 enum mf_action_page_type
{
2300 MF_MSG_KERNEL_HIGH_ORDER
,
2302 MF_MSG_DIFFERENT_COMPOUND
,
2303 MF_MSG_POISONED_HUGE
,
2306 MF_MSG_UNMAP_FAILED
,
2307 MF_MSG_DIRTY_SWAPCACHE
,
2308 MF_MSG_CLEAN_SWAPCACHE
,
2309 MF_MSG_DIRTY_MLOCKED_LRU
,
2310 MF_MSG_CLEAN_MLOCKED_LRU
,
2311 MF_MSG_DIRTY_UNEVICTABLE_LRU
,
2312 MF_MSG_CLEAN_UNEVICTABLE_LRU
,
2315 MF_MSG_TRUNCATED_LRU
,
2321 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
2322 extern void clear_huge_page(struct page
*page
,
2324 unsigned int pages_per_huge_page
);
2325 extern void copy_user_huge_page(struct page
*dst
, struct page
*src
,
2326 unsigned long addr
, struct vm_area_struct
*vma
,
2327 unsigned int pages_per_huge_page
);
2328 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
2330 extern struct page_ext_operations debug_guardpage_ops
;
2331 extern struct page_ext_operations page_poisoning_ops
;
2333 #ifdef CONFIG_DEBUG_PAGEALLOC
2334 extern unsigned int _debug_guardpage_minorder
;
2335 extern bool _debug_guardpage_enabled
;
2337 static inline unsigned int debug_guardpage_minorder(void)
2339 return _debug_guardpage_minorder
;
2342 static inline bool debug_guardpage_enabled(void)
2344 return _debug_guardpage_enabled
;
2347 static inline bool page_is_guard(struct page
*page
)
2349 struct page_ext
*page_ext
;
2351 if (!debug_guardpage_enabled())
2354 page_ext
= lookup_page_ext(page
);
2355 return test_bit(PAGE_EXT_DEBUG_GUARD
, &page_ext
->flags
);
2358 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2359 static inline bool debug_guardpage_enabled(void) { return false; }
2360 static inline bool page_is_guard(struct page
*page
) { return false; }
2361 #endif /* CONFIG_DEBUG_PAGEALLOC */
2363 #if MAX_NUMNODES > 1
2364 void __init
setup_nr_node_ids(void);
2366 static inline void setup_nr_node_ids(void) {}
2369 #endif /* __KERNEL__ */
2370 #endif /* _LINUX_MM_H */