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1da177e4 LT |
1 | #ifndef _LINUX_MM_H |
2 | #define _LINUX_MM_H | |
3 | ||
1da177e4 LT |
4 | #include <linux/errno.h> |
5 | ||
6 | #ifdef __KERNEL__ | |
7 | ||
1da177e4 LT |
8 | #include <linux/gfp.h> |
9 | #include <linux/list.h> | |
10 | #include <linux/mmzone.h> | |
11 | #include <linux/rbtree.h> | |
12 | #include <linux/prio_tree.h> | |
9a11b49a | 13 | #include <linux/debug_locks.h> |
5b99cd0e | 14 | #include <linux/mm_types.h> |
08677214 | 15 | #include <linux/range.h> |
c6f6b596 | 16 | #include <linux/pfn.h> |
1da177e4 LT |
17 | |
18 | struct mempolicy; | |
19 | struct anon_vma; | |
4e950f6f | 20 | struct file_ra_state; |
e8edc6e0 | 21 | struct user_struct; |
4e950f6f | 22 | struct writeback_control; |
1da177e4 LT |
23 | |
24 | #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */ | |
25 | extern unsigned long max_mapnr; | |
26 | #endif | |
27 | ||
28 | extern unsigned long num_physpages; | |
4481374c | 29 | extern unsigned long totalram_pages; |
1da177e4 | 30 | extern void * high_memory; |
1da177e4 LT |
31 | extern int page_cluster; |
32 | ||
33 | #ifdef CONFIG_SYSCTL | |
34 | extern int sysctl_legacy_va_layout; | |
35 | #else | |
36 | #define sysctl_legacy_va_layout 0 | |
37 | #endif | |
38 | ||
39 | #include <asm/page.h> | |
40 | #include <asm/pgtable.h> | |
41 | #include <asm/processor.h> | |
1da177e4 | 42 | |
1da177e4 LT |
43 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
44 | ||
27ac792c AR |
45 | /* to align the pointer to the (next) page boundary */ |
46 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
47 | ||
1da177e4 LT |
48 | /* |
49 | * Linux kernel virtual memory manager primitives. | |
50 | * The idea being to have a "virtual" mm in the same way | |
51 | * we have a virtual fs - giving a cleaner interface to the | |
52 | * mm details, and allowing different kinds of memory mappings | |
53 | * (from shared memory to executable loading to arbitrary | |
54 | * mmap() functions). | |
55 | */ | |
56 | ||
c43692e8 CL |
57 | extern struct kmem_cache *vm_area_cachep; |
58 | ||
1da177e4 | 59 | #ifndef CONFIG_MMU |
8feae131 DH |
60 | extern struct rb_root nommu_region_tree; |
61 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
62 | |
63 | extern unsigned int kobjsize(const void *objp); | |
64 | #endif | |
65 | ||
66 | /* | |
605d9288 | 67 | * vm_flags in vm_area_struct, see mm_types.h. |
1da177e4 LT |
68 | */ |
69 | #define VM_READ 0x00000001 /* currently active flags */ | |
70 | #define VM_WRITE 0x00000002 | |
71 | #define VM_EXEC 0x00000004 | |
72 | #define VM_SHARED 0x00000008 | |
73 | ||
7e2cff42 | 74 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
75 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
76 | #define VM_MAYWRITE 0x00000020 | |
77 | #define VM_MAYEXEC 0x00000040 | |
78 | #define VM_MAYSHARE 0x00000080 | |
79 | ||
80 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
8ca3eb08 | 81 | #if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64) |
1da177e4 | 82 | #define VM_GROWSUP 0x00000200 |
8ca3eb08 TL |
83 | #else |
84 | #define VM_GROWSUP 0x00000000 | |
85 | #endif | |
6aab341e | 86 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
1da177e4 LT |
87 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
88 | ||
89 | #define VM_EXECUTABLE 0x00001000 | |
90 | #define VM_LOCKED 0x00002000 | |
91 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
92 | ||
93 | /* Used by sys_madvise() */ | |
94 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
95 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
96 | ||
97 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
98 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
0b14c179 | 99 | #define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */ |
1da177e4 | 100 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 101 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 LT |
102 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
103 | #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */ | |
104 | #define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */ | |
895791da | 105 | #define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */ |
e5b97dde | 106 | #define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */ |
d00806b1 | 107 | |
d0217ac0 | 108 | #define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */ |
b379d790 | 109 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
aba46c50 | 110 | #define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */ |
895791da | 111 | #define VM_PFN_AT_MMAP 0x40000000 /* PFNMAP vma that is fully mapped at mmap time */ |
f8af4da3 | 112 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 113 | |
a8bef8ff MG |
114 | /* Bits set in the VMA until the stack is in its final location */ |
115 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) | |
116 | ||
1da177e4 LT |
117 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
118 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
119 | #endif | |
120 | ||
121 | #ifdef CONFIG_STACK_GROWSUP | |
122 | #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) | |
123 | #else | |
124 | #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) | |
125 | #endif | |
126 | ||
127 | #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ) | |
128 | #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK | |
129 | #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK)) | |
130 | #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ) | |
131 | #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ) | |
132 | ||
b291f000 NP |
133 | /* |
134 | * special vmas that are non-mergable, non-mlock()able | |
135 | */ | |
136 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP) | |
137 | ||
1da177e4 LT |
138 | /* |
139 | * mapping from the currently active vm_flags protection bits (the | |
140 | * low four bits) to a page protection mask.. | |
141 | */ | |
142 | extern pgprot_t protection_map[16]; | |
143 | ||
d0217ac0 NP |
144 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
145 | #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ | |
c2ec175c | 146 | #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */ |
d0217ac0 | 147 | |
6bd9cd50 | 148 | /* |
149 | * This interface is used by x86 PAT code to identify a pfn mapping that is | |
150 | * linear over entire vma. This is to optimize PAT code that deals with | |
151 | * marking the physical region with a particular prot. This is not for generic | |
152 | * mm use. Note also that this check will not work if the pfn mapping is | |
153 | * linear for a vma starting at physical address 0. In which case PAT code | |
154 | * falls back to slow path of reserving physical range page by page. | |
155 | */ | |
3c8bb73a | 156 | static inline int is_linear_pfn_mapping(struct vm_area_struct *vma) |
157 | { | |
895791da | 158 | return (vma->vm_flags & VM_PFN_AT_MMAP); |
3c8bb73a | 159 | } |
160 | ||
161 | static inline int is_pfn_mapping(struct vm_area_struct *vma) | |
162 | { | |
163 | return (vma->vm_flags & VM_PFNMAP); | |
164 | } | |
d0217ac0 | 165 | |
54cb8821 | 166 | /* |
d0217ac0 | 167 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
83c54070 NP |
168 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
169 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 170 | * |
d0217ac0 NP |
171 | * pgoff should be used in favour of virtual_address, if possible. If pgoff |
172 | * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear | |
173 | * mapping support. | |
54cb8821 | 174 | */ |
d0217ac0 NP |
175 | struct vm_fault { |
176 | unsigned int flags; /* FAULT_FLAG_xxx flags */ | |
177 | pgoff_t pgoff; /* Logical page offset based on vma */ | |
178 | void __user *virtual_address; /* Faulting virtual address */ | |
179 | ||
180 | struct page *page; /* ->fault handlers should return a | |
83c54070 | 181 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 182 | * is set (which is also implied by |
83c54070 | 183 | * VM_FAULT_ERROR). |
d0217ac0 | 184 | */ |
54cb8821 | 185 | }; |
1da177e4 LT |
186 | |
187 | /* | |
188 | * These are the virtual MM functions - opening of an area, closing and | |
189 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
190 | * to the functions called when a no-page or a wp-page exception occurs. | |
191 | */ | |
192 | struct vm_operations_struct { | |
193 | void (*open)(struct vm_area_struct * area); | |
194 | void (*close)(struct vm_area_struct * area); | |
d0217ac0 | 195 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
9637a5ef DH |
196 | |
197 | /* notification that a previously read-only page is about to become | |
198 | * writable, if an error is returned it will cause a SIGBUS */ | |
c2ec175c | 199 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
28b2ee20 RR |
200 | |
201 | /* called by access_process_vm when get_user_pages() fails, typically | |
202 | * for use by special VMAs that can switch between memory and hardware | |
203 | */ | |
204 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
205 | void *buf, int len, int write); | |
1da177e4 | 206 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
207 | /* |
208 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
209 | * to hold the policy upon return. Caller should pass NULL @new to | |
210 | * remove a policy and fall back to surrounding context--i.e. do not | |
211 | * install a MPOL_DEFAULT policy, nor the task or system default | |
212 | * mempolicy. | |
213 | */ | |
1da177e4 | 214 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
215 | |
216 | /* | |
217 | * get_policy() op must add reference [mpol_get()] to any policy at | |
218 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
219 | * in mm/mempolicy.c will do this automatically. | |
220 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
221 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. | |
222 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op | |
223 | * must return NULL--i.e., do not "fallback" to task or system default | |
224 | * policy. | |
225 | */ | |
1da177e4 LT |
226 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
227 | unsigned long addr); | |
7b2259b3 CL |
228 | int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, |
229 | const nodemask_t *to, unsigned long flags); | |
1da177e4 LT |
230 | #endif |
231 | }; | |
232 | ||
233 | struct mmu_gather; | |
234 | struct inode; | |
235 | ||
349aef0b AM |
236 | #define page_private(page) ((page)->private) |
237 | #define set_page_private(page, v) ((page)->private = (v)) | |
4c21e2f2 | 238 | |
1da177e4 LT |
239 | /* |
240 | * FIXME: take this include out, include page-flags.h in | |
241 | * files which need it (119 of them) | |
242 | */ | |
243 | #include <linux/page-flags.h> | |
244 | ||
245 | /* | |
246 | * Methods to modify the page usage count. | |
247 | * | |
248 | * What counts for a page usage: | |
249 | * - cache mapping (page->mapping) | |
250 | * - private data (page->private) | |
251 | * - page mapped in a task's page tables, each mapping | |
252 | * is counted separately | |
253 | * | |
254 | * Also, many kernel routines increase the page count before a critical | |
255 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
256 | */ |
257 | ||
258 | /* | |
da6052f7 | 259 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 260 | */ |
7c8ee9a8 NP |
261 | static inline int put_page_testzero(struct page *page) |
262 | { | |
725d704e | 263 | VM_BUG_ON(atomic_read(&page->_count) == 0); |
8dc04efb | 264 | return atomic_dec_and_test(&page->_count); |
7c8ee9a8 | 265 | } |
1da177e4 LT |
266 | |
267 | /* | |
7c8ee9a8 NP |
268 | * Try to grab a ref unless the page has a refcount of zero, return false if |
269 | * that is the case. | |
1da177e4 | 270 | */ |
7c8ee9a8 NP |
271 | static inline int get_page_unless_zero(struct page *page) |
272 | { | |
8dc04efb | 273 | return atomic_inc_not_zero(&page->_count); |
7c8ee9a8 | 274 | } |
1da177e4 | 275 | |
53df8fdc WF |
276 | extern int page_is_ram(unsigned long pfn); |
277 | ||
48667e7a | 278 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
279 | struct page *vmalloc_to_page(const void *addr); |
280 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 281 | |
0738c4bb PM |
282 | /* |
283 | * Determine if an address is within the vmalloc range | |
284 | * | |
285 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
286 | * is no special casing required. | |
287 | */ | |
9e2779fa CL |
288 | static inline int is_vmalloc_addr(const void *x) |
289 | { | |
0738c4bb | 290 | #ifdef CONFIG_MMU |
9e2779fa CL |
291 | unsigned long addr = (unsigned long)x; |
292 | ||
293 | return addr >= VMALLOC_START && addr < VMALLOC_END; | |
0738c4bb PM |
294 | #else |
295 | return 0; | |
8ca3ed87 | 296 | #endif |
0738c4bb | 297 | } |
81ac3ad9 KH |
298 | #ifdef CONFIG_MMU |
299 | extern int is_vmalloc_or_module_addr(const void *x); | |
300 | #else | |
934831d0 | 301 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
302 | { |
303 | return 0; | |
304 | } | |
305 | #endif | |
9e2779fa | 306 | |
d85f3385 CL |
307 | static inline struct page *compound_head(struct page *page) |
308 | { | |
6d777953 | 309 | if (unlikely(PageTail(page))) |
d85f3385 CL |
310 | return page->first_page; |
311 | return page; | |
312 | } | |
313 | ||
4c21e2f2 | 314 | static inline int page_count(struct page *page) |
1da177e4 | 315 | { |
d85f3385 | 316 | return atomic_read(&compound_head(page)->_count); |
1da177e4 LT |
317 | } |
318 | ||
319 | static inline void get_page(struct page *page) | |
320 | { | |
d85f3385 | 321 | page = compound_head(page); |
725d704e | 322 | VM_BUG_ON(atomic_read(&page->_count) == 0); |
1da177e4 LT |
323 | atomic_inc(&page->_count); |
324 | } | |
325 | ||
b49af68f CL |
326 | static inline struct page *virt_to_head_page(const void *x) |
327 | { | |
328 | struct page *page = virt_to_page(x); | |
329 | return compound_head(page); | |
330 | } | |
331 | ||
7835e98b NP |
332 | /* |
333 | * Setup the page count before being freed into the page allocator for | |
334 | * the first time (boot or memory hotplug) | |
335 | */ | |
336 | static inline void init_page_count(struct page *page) | |
337 | { | |
338 | atomic_set(&page->_count, 1); | |
339 | } | |
340 | ||
1da177e4 | 341 | void put_page(struct page *page); |
1d7ea732 | 342 | void put_pages_list(struct list_head *pages); |
1da177e4 | 343 | |
8dfcc9ba | 344 | void split_page(struct page *page, unsigned int order); |
748446bb | 345 | int split_free_page(struct page *page); |
8dfcc9ba | 346 | |
33f2ef89 AW |
347 | /* |
348 | * Compound pages have a destructor function. Provide a | |
349 | * prototype for that function and accessor functions. | |
350 | * These are _only_ valid on the head of a PG_compound page. | |
351 | */ | |
352 | typedef void compound_page_dtor(struct page *); | |
353 | ||
354 | static inline void set_compound_page_dtor(struct page *page, | |
355 | compound_page_dtor *dtor) | |
356 | { | |
357 | page[1].lru.next = (void *)dtor; | |
358 | } | |
359 | ||
360 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) | |
361 | { | |
362 | return (compound_page_dtor *)page[1].lru.next; | |
363 | } | |
364 | ||
d85f3385 CL |
365 | static inline int compound_order(struct page *page) |
366 | { | |
6d777953 | 367 | if (!PageHead(page)) |
d85f3385 CL |
368 | return 0; |
369 | return (unsigned long)page[1].lru.prev; | |
370 | } | |
371 | ||
372 | static inline void set_compound_order(struct page *page, unsigned long order) | |
373 | { | |
374 | page[1].lru.prev = (void *)order; | |
375 | } | |
376 | ||
1da177e4 LT |
377 | /* |
378 | * Multiple processes may "see" the same page. E.g. for untouched | |
379 | * mappings of /dev/null, all processes see the same page full of | |
380 | * zeroes, and text pages of executables and shared libraries have | |
381 | * only one copy in memory, at most, normally. | |
382 | * | |
383 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
384 | * page_count() == 0 means the page is free. page->lru is then used for |
385 | * freelist management in the buddy allocator. | |
da6052f7 | 386 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 387 | * |
da6052f7 NP |
388 | * Pages are allocated by the slab allocator in order to provide memory |
389 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
390 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
391 | * unless a particular usage is carefully commented. (the responsibility of | |
392 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 393 | * |
da6052f7 NP |
394 | * A page may be used by anyone else who does a __get_free_page(). |
395 | * In this case, page_count still tracks the references, and should only | |
396 | * be used through the normal accessor functions. The top bits of page->flags | |
397 | * and page->virtual store page management information, but all other fields | |
398 | * are unused and could be used privately, carefully. The management of this | |
399 | * page is the responsibility of the one who allocated it, and those who have | |
400 | * subsequently been given references to it. | |
401 | * | |
402 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
403 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
404 | * The following discussion applies only to them. | |
405 | * | |
da6052f7 NP |
406 | * A pagecache page contains an opaque `private' member, which belongs to the |
407 | * page's address_space. Usually, this is the address of a circular list of | |
408 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
409 | * into the filesystem to release these pages. | |
1da177e4 | 410 | * |
da6052f7 NP |
411 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
412 | * is the pointer to the inode, and page->index is the file offset of the page, | |
413 | * in units of PAGE_CACHE_SIZE. | |
1da177e4 | 414 | * |
da6052f7 NP |
415 | * If pagecache pages are not associated with an inode, they are said to be |
416 | * anonymous pages. These may become associated with the swapcache, and in that | |
417 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 418 | * |
da6052f7 NP |
419 | * In either case (swapcache or inode backed), the pagecache itself holds one |
420 | * reference to the page. Setting PG_private should also increment the | |
421 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 422 | * |
da6052f7 NP |
423 | * The pagecache pages are stored in a per-mapping radix tree, which is |
424 | * rooted at mapping->page_tree, and indexed by offset. | |
425 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space | |
426 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 427 | * |
da6052f7 | 428 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
429 | * - inode pages may need to be read from disk, |
430 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
431 | * to be written back to the inode on disk, |
432 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
433 | * modified may need to be swapped out to swap space and (later) to be read | |
434 | * back into memory. | |
1da177e4 LT |
435 | */ |
436 | ||
437 | /* | |
438 | * The zone field is never updated after free_area_init_core() | |
439 | * sets it, so none of the operations on it need to be atomic. | |
1da177e4 | 440 | */ |
348f8b6c | 441 | |
d41dee36 AW |
442 | |
443 | /* | |
444 | * page->flags layout: | |
445 | * | |
446 | * There are three possibilities for how page->flags get | |
447 | * laid out. The first is for the normal case, without | |
448 | * sparsemem. The second is for sparsemem when there is | |
449 | * plenty of space for node and section. The last is when | |
450 | * we have run out of space and have to fall back to an | |
451 | * alternate (slower) way of determining the node. | |
452 | * | |
308c05e3 CL |
453 | * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS | |
454 | * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS | | |
455 | * classic sparse no space for node: | SECTION | ZONE | ... | FLAGS | | |
d41dee36 | 456 | */ |
308c05e3 | 457 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
d41dee36 AW |
458 | #define SECTIONS_WIDTH SECTIONS_SHIFT |
459 | #else | |
460 | #define SECTIONS_WIDTH 0 | |
461 | #endif | |
462 | ||
463 | #define ZONES_WIDTH ZONES_SHIFT | |
464 | ||
9223b419 | 465 | #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS |
d41dee36 AW |
466 | #define NODES_WIDTH NODES_SHIFT |
467 | #else | |
308c05e3 CL |
468 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
469 | #error "Vmemmap: No space for nodes field in page flags" | |
470 | #endif | |
d41dee36 AW |
471 | #define NODES_WIDTH 0 |
472 | #endif | |
473 | ||
474 | /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */ | |
07808b74 | 475 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
d41dee36 AW |
476 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
477 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
478 | ||
479 | /* | |
480 | * We are going to use the flags for the page to node mapping if its in | |
481 | * there. This includes the case where there is no node, so it is implicit. | |
482 | */ | |
89689ae7 CL |
483 | #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0) |
484 | #define NODE_NOT_IN_PAGE_FLAGS | |
485 | #endif | |
d41dee36 AW |
486 | |
487 | #ifndef PFN_SECTION_SHIFT | |
488 | #define PFN_SECTION_SHIFT 0 | |
489 | #endif | |
348f8b6c DH |
490 | |
491 | /* | |
492 | * Define the bit shifts to access each section. For non-existant | |
493 | * sections we define the shift as 0; that plus a 0 mask ensures | |
494 | * the compiler will optimise away reference to them. | |
495 | */ | |
d41dee36 AW |
496 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
497 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
498 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
348f8b6c | 499 | |
89689ae7 CL |
500 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allcator */ |
501 | #ifdef NODE_NOT_IN_PAGEFLAGS | |
502 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) | |
bd8029b6 AW |
503 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
504 | SECTIONS_PGOFF : ZONES_PGOFF) | |
d41dee36 | 505 | #else |
89689ae7 | 506 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
507 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
508 | NODES_PGOFF : ZONES_PGOFF) | |
89689ae7 CL |
509 | #endif |
510 | ||
bd8029b6 | 511 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
348f8b6c | 512 | |
9223b419 CL |
513 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
514 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS | |
348f8b6c DH |
515 | #endif |
516 | ||
d41dee36 AW |
517 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
518 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
519 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
89689ae7 | 520 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
348f8b6c | 521 | |
2f1b6248 | 522 | static inline enum zone_type page_zonenum(struct page *page) |
1da177e4 | 523 | { |
348f8b6c | 524 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
1da177e4 | 525 | } |
1da177e4 | 526 | |
89689ae7 CL |
527 | /* |
528 | * The identification function is only used by the buddy allocator for | |
529 | * determining if two pages could be buddies. We are not really | |
530 | * identifying a zone since we could be using a the section number | |
531 | * id if we have not node id available in page flags. | |
532 | * We guarantee only that it will return the same value for two | |
533 | * combinable pages in a zone. | |
534 | */ | |
cb2b95e1 AW |
535 | static inline int page_zone_id(struct page *page) |
536 | { | |
89689ae7 | 537 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
538 | } |
539 | ||
25ba77c1 | 540 | static inline int zone_to_nid(struct zone *zone) |
89fa3024 | 541 | { |
d5f541ed CL |
542 | #ifdef CONFIG_NUMA |
543 | return zone->node; | |
544 | #else | |
545 | return 0; | |
546 | #endif | |
89fa3024 CL |
547 | } |
548 | ||
89689ae7 | 549 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
25ba77c1 | 550 | extern int page_to_nid(struct page *page); |
89689ae7 | 551 | #else |
25ba77c1 | 552 | static inline int page_to_nid(struct page *page) |
d41dee36 | 553 | { |
89689ae7 | 554 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
d41dee36 | 555 | } |
89689ae7 CL |
556 | #endif |
557 | ||
558 | static inline struct zone *page_zone(struct page *page) | |
559 | { | |
560 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
561 | } | |
562 | ||
308c05e3 | 563 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
d41dee36 AW |
564 | static inline unsigned long page_to_section(struct page *page) |
565 | { | |
566 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
567 | } | |
308c05e3 | 568 | #endif |
d41dee36 | 569 | |
2f1b6248 | 570 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
571 | { |
572 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
573 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
574 | } | |
2f1b6248 | 575 | |
348f8b6c DH |
576 | static inline void set_page_node(struct page *page, unsigned long node) |
577 | { | |
578 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
579 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 580 | } |
89689ae7 | 581 | |
d41dee36 AW |
582 | static inline void set_page_section(struct page *page, unsigned long section) |
583 | { | |
584 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
585 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
586 | } | |
1da177e4 | 587 | |
2f1b6248 | 588 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 589 | unsigned long node, unsigned long pfn) |
1da177e4 | 590 | { |
348f8b6c DH |
591 | set_page_zone(page, zone); |
592 | set_page_node(page, node); | |
d41dee36 | 593 | set_page_section(page, pfn_to_section_nr(pfn)); |
1da177e4 LT |
594 | } |
595 | ||
f6ac2354 CL |
596 | /* |
597 | * Some inline functions in vmstat.h depend on page_zone() | |
598 | */ | |
599 | #include <linux/vmstat.h> | |
600 | ||
652050ae | 601 | static __always_inline void *lowmem_page_address(struct page *page) |
1da177e4 | 602 | { |
c6f6b596 | 603 | return __va(PFN_PHYS(page_to_pfn(page))); |
1da177e4 LT |
604 | } |
605 | ||
606 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) | |
607 | #define HASHED_PAGE_VIRTUAL | |
608 | #endif | |
609 | ||
610 | #if defined(WANT_PAGE_VIRTUAL) | |
611 | #define page_address(page) ((page)->virtual) | |
612 | #define set_page_address(page, address) \ | |
613 | do { \ | |
614 | (page)->virtual = (address); \ | |
615 | } while(0) | |
616 | #define page_address_init() do { } while(0) | |
617 | #endif | |
618 | ||
619 | #if defined(HASHED_PAGE_VIRTUAL) | |
620 | void *page_address(struct page *page); | |
621 | void set_page_address(struct page *page, void *virtual); | |
622 | void page_address_init(void); | |
623 | #endif | |
624 | ||
625 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) | |
626 | #define page_address(page) lowmem_page_address(page) | |
627 | #define set_page_address(page, address) do { } while(0) | |
628 | #define page_address_init() do { } while(0) | |
629 | #endif | |
630 | ||
631 | /* | |
632 | * On an anonymous page mapped into a user virtual memory area, | |
633 | * page->mapping points to its anon_vma, not to a struct address_space; | |
3ca7b3c5 HD |
634 | * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. |
635 | * | |
636 | * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled, | |
637 | * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit; | |
638 | * and then page->mapping points, not to an anon_vma, but to a private | |
639 | * structure which KSM associates with that merged page. See ksm.h. | |
640 | * | |
641 | * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used. | |
1da177e4 LT |
642 | * |
643 | * Please note that, confusingly, "page_mapping" refers to the inode | |
644 | * address_space which maps the page from disk; whereas "page_mapped" | |
645 | * refers to user virtual address space into which the page is mapped. | |
646 | */ | |
647 | #define PAGE_MAPPING_ANON 1 | |
3ca7b3c5 HD |
648 | #define PAGE_MAPPING_KSM 2 |
649 | #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM) | |
1da177e4 LT |
650 | |
651 | extern struct address_space swapper_space; | |
652 | static inline struct address_space *page_mapping(struct page *page) | |
653 | { | |
654 | struct address_space *mapping = page->mapping; | |
655 | ||
b5fab14e | 656 | VM_BUG_ON(PageSlab(page)); |
1da177e4 LT |
657 | if (unlikely(PageSwapCache(page))) |
658 | mapping = &swapper_space; | |
f096e59e | 659 | else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON)) |
1da177e4 LT |
660 | mapping = NULL; |
661 | return mapping; | |
662 | } | |
663 | ||
3ca7b3c5 HD |
664 | /* Neutral page->mapping pointer to address_space or anon_vma or other */ |
665 | static inline void *page_rmapping(struct page *page) | |
666 | { | |
667 | return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS); | |
668 | } | |
669 | ||
1da177e4 LT |
670 | static inline int PageAnon(struct page *page) |
671 | { | |
672 | return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; | |
673 | } | |
674 | ||
675 | /* | |
676 | * Return the pagecache index of the passed page. Regular pagecache pages | |
677 | * use ->index whereas swapcache pages use ->private | |
678 | */ | |
679 | static inline pgoff_t page_index(struct page *page) | |
680 | { | |
681 | if (unlikely(PageSwapCache(page))) | |
4c21e2f2 | 682 | return page_private(page); |
1da177e4 LT |
683 | return page->index; |
684 | } | |
685 | ||
686 | /* | |
687 | * The atomic page->_mapcount, like _count, starts from -1: | |
688 | * so that transitions both from it and to it can be tracked, | |
689 | * using atomic_inc_and_test and atomic_add_negative(-1). | |
690 | */ | |
691 | static inline void reset_page_mapcount(struct page *page) | |
692 | { | |
693 | atomic_set(&(page)->_mapcount, -1); | |
694 | } | |
695 | ||
696 | static inline int page_mapcount(struct page *page) | |
697 | { | |
698 | return atomic_read(&(page)->_mapcount) + 1; | |
699 | } | |
700 | ||
701 | /* | |
702 | * Return true if this page is mapped into pagetables. | |
703 | */ | |
704 | static inline int page_mapped(struct page *page) | |
705 | { | |
706 | return atomic_read(&(page)->_mapcount) >= 0; | |
707 | } | |
708 | ||
1da177e4 LT |
709 | /* |
710 | * Different kinds of faults, as returned by handle_mm_fault(). | |
711 | * Used to decide whether a process gets delivered SIGBUS or | |
712 | * just gets major/minor fault counters bumped up. | |
713 | */ | |
d0217ac0 | 714 | |
83c54070 | 715 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ |
d0217ac0 | 716 | |
83c54070 NP |
717 | #define VM_FAULT_OOM 0x0001 |
718 | #define VM_FAULT_SIGBUS 0x0002 | |
719 | #define VM_FAULT_MAJOR 0x0004 | |
720 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ | |
d1737fdb | 721 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned page */ |
f33ea7f4 | 722 | |
83c54070 NP |
723 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
724 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ | |
1da177e4 | 725 | |
d1737fdb | 726 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON) |
d0217ac0 | 727 | |
1c0fe6e3 NP |
728 | /* |
729 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
730 | */ | |
731 | extern void pagefault_out_of_memory(void); | |
732 | ||
1da177e4 LT |
733 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
734 | ||
735 | extern void show_free_areas(void); | |
736 | ||
3f96b79a | 737 | int shmem_lock(struct file *file, int lock, struct user_struct *user); |
168f5ac6 | 738 | struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags); |
1da177e4 LT |
739 | int shmem_zero_setup(struct vm_area_struct *); |
740 | ||
b0e15190 DH |
741 | #ifndef CONFIG_MMU |
742 | extern unsigned long shmem_get_unmapped_area(struct file *file, | |
743 | unsigned long addr, | |
744 | unsigned long len, | |
745 | unsigned long pgoff, | |
746 | unsigned long flags); | |
747 | #endif | |
748 | ||
e8edc6e0 | 749 | extern int can_do_mlock(void); |
1da177e4 LT |
750 | extern int user_shm_lock(size_t, struct user_struct *); |
751 | extern void user_shm_unlock(size_t, struct user_struct *); | |
752 | ||
753 | /* | |
754 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
755 | */ | |
756 | struct zap_details { | |
757 | struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ | |
758 | struct address_space *check_mapping; /* Check page->mapping if set */ | |
759 | pgoff_t first_index; /* Lowest page->index to unmap */ | |
760 | pgoff_t last_index; /* Highest page->index to unmap */ | |
761 | spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */ | |
1da177e4 LT |
762 | unsigned long truncate_count; /* Compare vm_truncate_count */ |
763 | }; | |
764 | ||
7e675137 NP |
765 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
766 | pte_t pte); | |
767 | ||
c627f9cc JS |
768 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
769 | unsigned long size); | |
ee39b37b | 770 | unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address, |
1da177e4 | 771 | unsigned long size, struct zap_details *); |
508034a3 | 772 | unsigned long unmap_vmas(struct mmu_gather **tlb, |
1da177e4 LT |
773 | struct vm_area_struct *start_vma, unsigned long start_addr, |
774 | unsigned long end_addr, unsigned long *nr_accounted, | |
775 | struct zap_details *); | |
e6473092 MM |
776 | |
777 | /** | |
778 | * mm_walk - callbacks for walk_page_range | |
779 | * @pgd_entry: if set, called for each non-empty PGD (top-level) entry | |
780 | * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry | |
781 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry | |
782 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry | |
783 | * @pte_hole: if set, called for each hole at all levels | |
5dc37642 | 784 | * @hugetlb_entry: if set, called for each hugetlb entry |
e6473092 MM |
785 | * |
786 | * (see walk_page_range for more details) | |
787 | */ | |
788 | struct mm_walk { | |
2165009b DH |
789 | int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *); |
790 | int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *); | |
791 | int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *); | |
792 | int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *); | |
793 | int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *); | |
116354d1 NH |
794 | int (*hugetlb_entry)(pte_t *, unsigned long, |
795 | unsigned long, unsigned long, struct mm_walk *); | |
2165009b DH |
796 | struct mm_struct *mm; |
797 | void *private; | |
e6473092 MM |
798 | }; |
799 | ||
2165009b DH |
800 | int walk_page_range(unsigned long addr, unsigned long end, |
801 | struct mm_walk *walk); | |
42b77728 | 802 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 803 | unsigned long end, unsigned long floor, unsigned long ceiling); |
1da177e4 LT |
804 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
805 | struct vm_area_struct *vma); | |
1da177e4 LT |
806 | void unmap_mapping_range(struct address_space *mapping, |
807 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
3b6748e2 JW |
808 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
809 | unsigned long *pfn); | |
d87fe660 | 810 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
811 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | |
28b2ee20 RR |
812 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
813 | void *buf, int len, int write); | |
1da177e4 LT |
814 | |
815 | static inline void unmap_shared_mapping_range(struct address_space *mapping, | |
816 | loff_t const holebegin, loff_t const holelen) | |
817 | { | |
818 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
819 | } | |
820 | ||
25d9e2d1 | 821 | extern void truncate_pagecache(struct inode *inode, loff_t old, loff_t new); |
2c27c65e | 822 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
25d9e2d1 | 823 | extern int vmtruncate(struct inode *inode, loff_t offset); |
824 | extern int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end); | |
f33ea7f4 | 825 | |
750b4987 | 826 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
25718736 | 827 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
750b4987 | 828 | |
83f78668 WF |
829 | int invalidate_inode_page(struct page *page); |
830 | ||
7ee1dd3f | 831 | #ifdef CONFIG_MMU |
83c54070 | 832 | extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
d06063cc | 833 | unsigned long address, unsigned int flags); |
7ee1dd3f DH |
834 | #else |
835 | static inline int handle_mm_fault(struct mm_struct *mm, | |
836 | struct vm_area_struct *vma, unsigned long address, | |
d06063cc | 837 | unsigned int flags) |
7ee1dd3f DH |
838 | { |
839 | /* should never happen if there's no MMU */ | |
840 | BUG(); | |
841 | return VM_FAULT_SIGBUS; | |
842 | } | |
843 | #endif | |
f33ea7f4 | 844 | |
1da177e4 LT |
845 | extern int make_pages_present(unsigned long addr, unsigned long end); |
846 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); | |
1da177e4 | 847 | |
d2bf6be8 | 848 | int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
9d73777e | 849 | unsigned long start, int nr_pages, int write, int force, |
d2bf6be8 NP |
850 | struct page **pages, struct vm_area_struct **vmas); |
851 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, | |
852 | struct page **pages); | |
f3e8fccd | 853 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 854 | |
cf9a2ae8 DH |
855 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
856 | extern void do_invalidatepage(struct page *page, unsigned long offset); | |
857 | ||
1da177e4 | 858 | int __set_page_dirty_nobuffers(struct page *page); |
76719325 | 859 | int __set_page_dirty_no_writeback(struct page *page); |
1da177e4 LT |
860 | int redirty_page_for_writepage(struct writeback_control *wbc, |
861 | struct page *page); | |
e3a7cca1 | 862 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
b3c97528 | 863 | int set_page_dirty(struct page *page); |
1da177e4 LT |
864 | int set_page_dirty_lock(struct page *page); |
865 | int clear_page_dirty_for_io(struct page *page); | |
866 | ||
39aa3cb3 SB |
867 | /* Is the vma a continuation of the stack vma above it? */ |
868 | static inline int vma_stack_continue(struct vm_area_struct *vma, unsigned long addr) | |
869 | { | |
870 | return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); | |
871 | } | |
872 | ||
b6a2fea3 OW |
873 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
874 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
875 | unsigned long new_addr, unsigned long len); | |
1da177e4 LT |
876 | extern unsigned long do_mremap(unsigned long addr, |
877 | unsigned long old_len, unsigned long new_len, | |
878 | unsigned long flags, unsigned long new_addr); | |
b6a2fea3 OW |
879 | extern int mprotect_fixup(struct vm_area_struct *vma, |
880 | struct vm_area_struct **pprev, unsigned long start, | |
881 | unsigned long end, unsigned long newflags); | |
1da177e4 | 882 | |
465a454f PZ |
883 | /* |
884 | * doesn't attempt to fault and will return short. | |
885 | */ | |
886 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, | |
887 | struct page **pages); | |
d559db08 KH |
888 | /* |
889 | * per-process(per-mm_struct) statistics. | |
890 | */ | |
34e55232 | 891 | #if defined(SPLIT_RSS_COUNTING) |
d559db08 KH |
892 | /* |
893 | * The mm counters are not protected by its page_table_lock, | |
894 | * so must be incremented atomically. | |
895 | */ | |
896 | static inline void set_mm_counter(struct mm_struct *mm, int member, long value) | |
897 | { | |
898 | atomic_long_set(&mm->rss_stat.count[member], value); | |
899 | } | |
900 | ||
34e55232 | 901 | unsigned long get_mm_counter(struct mm_struct *mm, int member); |
d559db08 KH |
902 | |
903 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) | |
904 | { | |
905 | atomic_long_add(value, &mm->rss_stat.count[member]); | |
906 | } | |
907 | ||
908 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
909 | { | |
910 | atomic_long_inc(&mm->rss_stat.count[member]); | |
911 | } | |
912 | ||
913 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
914 | { | |
915 | atomic_long_dec(&mm->rss_stat.count[member]); | |
916 | } | |
917 | ||
918 | #else /* !USE_SPLIT_PTLOCKS */ | |
919 | /* | |
920 | * The mm counters are protected by its page_table_lock, | |
921 | * so can be incremented directly. | |
922 | */ | |
923 | static inline void set_mm_counter(struct mm_struct *mm, int member, long value) | |
924 | { | |
925 | mm->rss_stat.count[member] = value; | |
926 | } | |
927 | ||
928 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) | |
929 | { | |
930 | return mm->rss_stat.count[member]; | |
931 | } | |
932 | ||
933 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) | |
934 | { | |
935 | mm->rss_stat.count[member] += value; | |
936 | } | |
937 | ||
938 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
939 | { | |
940 | mm->rss_stat.count[member]++; | |
941 | } | |
942 | ||
943 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
944 | { | |
945 | mm->rss_stat.count[member]--; | |
946 | } | |
947 | ||
948 | #endif /* !USE_SPLIT_PTLOCKS */ | |
949 | ||
950 | static inline unsigned long get_mm_rss(struct mm_struct *mm) | |
951 | { | |
952 | return get_mm_counter(mm, MM_FILEPAGES) + | |
953 | get_mm_counter(mm, MM_ANONPAGES); | |
954 | } | |
955 | ||
956 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
957 | { | |
958 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
959 | } | |
960 | ||
961 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
962 | { | |
963 | return max(mm->hiwater_vm, mm->total_vm); | |
964 | } | |
965 | ||
966 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
967 | { | |
968 | unsigned long _rss = get_mm_rss(mm); | |
969 | ||
970 | if ((mm)->hiwater_rss < _rss) | |
971 | (mm)->hiwater_rss = _rss; | |
972 | } | |
973 | ||
974 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
975 | { | |
976 | if (mm->hiwater_vm < mm->total_vm) | |
977 | mm->hiwater_vm = mm->total_vm; | |
978 | } | |
979 | ||
980 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, | |
981 | struct mm_struct *mm) | |
982 | { | |
983 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
984 | ||
985 | if (*maxrss < hiwater_rss) | |
986 | *maxrss = hiwater_rss; | |
987 | } | |
988 | ||
53bddb4e | 989 | #if defined(SPLIT_RSS_COUNTING) |
34e55232 | 990 | void sync_mm_rss(struct task_struct *task, struct mm_struct *mm); |
53bddb4e KH |
991 | #else |
992 | static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm) | |
993 | { | |
994 | } | |
995 | #endif | |
465a454f | 996 | |
1da177e4 | 997 | /* |
8e1f936b | 998 | * A callback you can register to apply pressure to ageable caches. |
1da177e4 | 999 | * |
8e1f936b RR |
1000 | * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should |
1001 | * look through the least-recently-used 'nr_to_scan' entries and | |
1002 | * attempt to free them up. It should return the number of objects | |
1003 | * which remain in the cache. If it returns -1, it means it cannot do | |
1004 | * any scanning at this time (eg. there is a risk of deadlock). | |
1da177e4 | 1005 | * |
8e1f936b RR |
1006 | * The 'gfpmask' refers to the allocation we are currently trying to |
1007 | * fulfil. | |
1008 | * | |
1009 | * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is | |
1010 | * querying the cache size, so a fastpath for that case is appropriate. | |
1da177e4 | 1011 | */ |
8e1f936b | 1012 | struct shrinker { |
7f8275d0 | 1013 | int (*shrink)(struct shrinker *, int nr_to_scan, gfp_t gfp_mask); |
8e1f936b | 1014 | int seeks; /* seeks to recreate an obj */ |
1da177e4 | 1015 | |
8e1f936b RR |
1016 | /* These are for internal use */ |
1017 | struct list_head list; | |
1018 | long nr; /* objs pending delete */ | |
1019 | }; | |
1020 | #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */ | |
1021 | extern void register_shrinker(struct shrinker *); | |
1022 | extern void unregister_shrinker(struct shrinker *); | |
1da177e4 | 1023 | |
4e950f6f | 1024 | int vma_wants_writenotify(struct vm_area_struct *vma); |
d08b3851 | 1025 | |
b3c97528 | 1026 | extern pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl); |
c9cfcddf | 1027 | |
5f22df00 NP |
1028 | #ifdef __PAGETABLE_PUD_FOLDED |
1029 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, | |
1030 | unsigned long address) | |
1031 | { | |
1032 | return 0; | |
1033 | } | |
1034 | #else | |
1bb3630e | 1035 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
5f22df00 NP |
1036 | #endif |
1037 | ||
1038 | #ifdef __PAGETABLE_PMD_FOLDED | |
1039 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, | |
1040 | unsigned long address) | |
1041 | { | |
1042 | return 0; | |
1043 | } | |
1044 | #else | |
1bb3630e | 1045 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
5f22df00 NP |
1046 | #endif |
1047 | ||
1bb3630e HD |
1048 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); |
1049 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); | |
1050 | ||
1da177e4 LT |
1051 | /* |
1052 | * The following ifdef needed to get the 4level-fixup.h header to work. | |
1053 | * Remove it when 4level-fixup.h has been removed. | |
1054 | */ | |
1bb3630e | 1055 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
1da177e4 LT |
1056 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
1057 | { | |
1bb3630e HD |
1058 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
1059 | NULL: pud_offset(pgd, address); | |
1da177e4 LT |
1060 | } |
1061 | ||
1062 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) | |
1063 | { | |
1bb3630e HD |
1064 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
1065 | NULL: pmd_offset(pud, address); | |
1da177e4 | 1066 | } |
1bb3630e HD |
1067 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
1068 | ||
f7d0b926 | 1069 | #if USE_SPLIT_PTLOCKS |
4c21e2f2 HD |
1070 | /* |
1071 | * We tuck a spinlock to guard each pagetable page into its struct page, | |
1072 | * at page->private, with BUILD_BUG_ON to make sure that this will not | |
1073 | * overflow into the next struct page (as it might with DEBUG_SPINLOCK). | |
1074 | * When freeing, reset page->mapping so free_pages_check won't complain. | |
1075 | */ | |
349aef0b | 1076 | #define __pte_lockptr(page) &((page)->ptl) |
4c21e2f2 HD |
1077 | #define pte_lock_init(_page) do { \ |
1078 | spin_lock_init(__pte_lockptr(_page)); \ | |
1079 | } while (0) | |
1080 | #define pte_lock_deinit(page) ((page)->mapping = NULL) | |
1081 | #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));}) | |
f7d0b926 | 1082 | #else /* !USE_SPLIT_PTLOCKS */ |
4c21e2f2 HD |
1083 | /* |
1084 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
1085 | */ | |
1086 | #define pte_lock_init(page) do {} while (0) | |
1087 | #define pte_lock_deinit(page) do {} while (0) | |
1088 | #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;}) | |
f7d0b926 | 1089 | #endif /* USE_SPLIT_PTLOCKS */ |
4c21e2f2 | 1090 | |
2f569afd MS |
1091 | static inline void pgtable_page_ctor(struct page *page) |
1092 | { | |
1093 | pte_lock_init(page); | |
1094 | inc_zone_page_state(page, NR_PAGETABLE); | |
1095 | } | |
1096 | ||
1097 | static inline void pgtable_page_dtor(struct page *page) | |
1098 | { | |
1099 | pte_lock_deinit(page); | |
1100 | dec_zone_page_state(page, NR_PAGETABLE); | |
1101 | } | |
1102 | ||
c74df32c HD |
1103 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
1104 | ({ \ | |
4c21e2f2 | 1105 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
c74df32c HD |
1106 | pte_t *__pte = pte_offset_map(pmd, address); \ |
1107 | *(ptlp) = __ptl; \ | |
1108 | spin_lock(__ptl); \ | |
1109 | __pte; \ | |
1110 | }) | |
1111 | ||
1112 | #define pte_unmap_unlock(pte, ptl) do { \ | |
1113 | spin_unlock(ptl); \ | |
1114 | pte_unmap(pte); \ | |
1115 | } while (0) | |
1116 | ||
1bb3630e HD |
1117 | #define pte_alloc_map(mm, pmd, address) \ |
1118 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ | |
1119 | NULL: pte_offset_map(pmd, address)) | |
1120 | ||
c74df32c HD |
1121 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
1122 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ | |
1123 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) | |
1124 | ||
1bb3630e HD |
1125 | #define pte_alloc_kernel(pmd, address) \ |
1126 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ | |
1127 | NULL: pte_offset_kernel(pmd, address)) | |
1da177e4 LT |
1128 | |
1129 | extern void free_area_init(unsigned long * zones_size); | |
9109fb7b JW |
1130 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
1131 | unsigned long zone_start_pfn, unsigned long *zholes_size); | |
c713216d MG |
1132 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
1133 | /* | |
1134 | * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its | |
1135 | * zones, allocate the backing mem_map and account for memory holes in a more | |
1136 | * architecture independent manner. This is a substitute for creating the | |
1137 | * zone_sizes[] and zholes_size[] arrays and passing them to | |
1138 | * free_area_init_node() | |
1139 | * | |
1140 | * An architecture is expected to register range of page frames backed by | |
1141 | * physical memory with add_active_range() before calling | |
1142 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic | |
1143 | * usage, an architecture is expected to do something like | |
1144 | * | |
1145 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
1146 | * max_highmem_pfn}; | |
1147 | * for_each_valid_physical_page_range() | |
1148 | * add_active_range(node_id, start_pfn, end_pfn) | |
1149 | * free_area_init_nodes(max_zone_pfns); | |
1150 | * | |
1151 | * If the architecture guarantees that there are no holes in the ranges | |
1152 | * registered with add_active_range(), free_bootmem_active_regions() | |
1153 | * will call free_bootmem_node() for each registered physical page range. | |
1154 | * Similarly sparse_memory_present_with_active_regions() calls | |
1155 | * memory_present() for each range when SPARSEMEM is enabled. | |
1156 | * | |
1157 | * See mm/page_alloc.c for more information on each function exposed by | |
1158 | * CONFIG_ARCH_POPULATES_NODE_MAP | |
1159 | */ | |
1160 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); | |
1161 | extern void add_active_range(unsigned int nid, unsigned long start_pfn, | |
1162 | unsigned long end_pfn); | |
cc1050ba YL |
1163 | extern void remove_active_range(unsigned int nid, unsigned long start_pfn, |
1164 | unsigned long end_pfn); | |
c713216d | 1165 | extern void remove_all_active_ranges(void); |
32996250 YL |
1166 | void sort_node_map(void); |
1167 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, | |
1168 | unsigned long end_pfn); | |
c713216d MG |
1169 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
1170 | unsigned long end_pfn); | |
1171 | extern void get_pfn_range_for_nid(unsigned int nid, | |
1172 | unsigned long *start_pfn, unsigned long *end_pfn); | |
1173 | extern unsigned long find_min_pfn_with_active_regions(void); | |
c713216d MG |
1174 | extern void free_bootmem_with_active_regions(int nid, |
1175 | unsigned long max_low_pfn); | |
08677214 YL |
1176 | int add_from_early_node_map(struct range *range, int az, |
1177 | int nr_range, int nid); | |
1178 | void *__alloc_memory_core_early(int nodeid, u64 size, u64 align, | |
1179 | u64 goal, u64 limit); | |
d52d53b8 | 1180 | typedef int (*work_fn_t)(unsigned long, unsigned long, void *); |
b5bc6c0e | 1181 | extern void work_with_active_regions(int nid, work_fn_t work_fn, void *data); |
c713216d | 1182 | extern void sparse_memory_present_with_active_regions(int nid); |
c713216d | 1183 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
f2dbcfa7 KH |
1184 | |
1185 | #if !defined(CONFIG_ARCH_POPULATES_NODE_MAP) && \ | |
1186 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) | |
1187 | static inline int __early_pfn_to_nid(unsigned long pfn) | |
1188 | { | |
1189 | return 0; | |
1190 | } | |
1191 | #else | |
1192 | /* please see mm/page_alloc.c */ | |
1193 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
1194 | #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID | |
1195 | /* there is a per-arch backend function. */ | |
1196 | extern int __meminit __early_pfn_to_nid(unsigned long pfn); | |
1197 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ | |
1198 | #endif | |
1199 | ||
0e0b864e | 1200 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
a2f3aa02 DH |
1201 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
1202 | unsigned long, enum memmap_context); | |
bc75d33f | 1203 | extern void setup_per_zone_wmarks(void); |
96cb4df5 | 1204 | extern void calculate_zone_inactive_ratio(struct zone *zone); |
1da177e4 | 1205 | extern void mem_init(void); |
8feae131 | 1206 | extern void __init mmap_init(void); |
1da177e4 LT |
1207 | extern void show_mem(void); |
1208 | extern void si_meminfo(struct sysinfo * val); | |
1209 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
3461b0af | 1210 | extern int after_bootmem; |
1da177e4 | 1211 | |
e7c8d5c9 | 1212 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 1213 | |
112067f0 SL |
1214 | extern void zone_pcp_update(struct zone *zone); |
1215 | ||
8feae131 | 1216 | /* nommu.c */ |
33e5d769 | 1217 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 1218 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 1219 | |
1da177e4 LT |
1220 | /* prio_tree.c */ |
1221 | void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old); | |
1222 | void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *); | |
1223 | void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *); | |
1224 | struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma, | |
1225 | struct prio_tree_iter *iter); | |
1226 | ||
1227 | #define vma_prio_tree_foreach(vma, iter, root, begin, end) \ | |
1228 | for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \ | |
1229 | (vma = vma_prio_tree_next(vma, iter)); ) | |
1230 | ||
1231 | static inline void vma_nonlinear_insert(struct vm_area_struct *vma, | |
1232 | struct list_head *list) | |
1233 | { | |
1234 | vma->shared.vm_set.parent = NULL; | |
1235 | list_add_tail(&vma->shared.vm_set.list, list); | |
1236 | } | |
1237 | ||
1238 | /* mmap.c */ | |
34b4e4aa | 1239 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
5beb4930 | 1240 | extern int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
1da177e4 LT |
1241 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
1242 | extern struct vm_area_struct *vma_merge(struct mm_struct *, | |
1243 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, | |
1244 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, | |
1245 | struct mempolicy *); | |
1246 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); | |
1247 | extern int split_vma(struct mm_struct *, | |
1248 | struct vm_area_struct *, unsigned long addr, int new_below); | |
1249 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); | |
1250 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, | |
1251 | struct rb_node **, struct rb_node *); | |
a8fb5618 | 1252 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 LT |
1253 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
1254 | unsigned long addr, unsigned long len, pgoff_t pgoff); | |
1255 | extern void exit_mmap(struct mm_struct *); | |
925d1c40 | 1256 | |
7906d00c AA |
1257 | extern int mm_take_all_locks(struct mm_struct *mm); |
1258 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
1259 | ||
925d1c40 MH |
1260 | #ifdef CONFIG_PROC_FS |
1261 | /* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */ | |
1262 | extern void added_exe_file_vma(struct mm_struct *mm); | |
1263 | extern void removed_exe_file_vma(struct mm_struct *mm); | |
1264 | #else | |
1265 | static inline void added_exe_file_vma(struct mm_struct *mm) | |
1266 | {} | |
1267 | ||
1268 | static inline void removed_exe_file_vma(struct mm_struct *mm) | |
1269 | {} | |
1270 | #endif /* CONFIG_PROC_FS */ | |
1271 | ||
119f657c | 1272 | extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); |
fa5dc22f RM |
1273 | extern int install_special_mapping(struct mm_struct *mm, |
1274 | unsigned long addr, unsigned long len, | |
1275 | unsigned long flags, struct page **pages); | |
1da177e4 LT |
1276 | |
1277 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1278 | ||
1279 | extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, | |
1280 | unsigned long len, unsigned long prot, | |
1281 | unsigned long flag, unsigned long pgoff); | |
0165ab44 MS |
1282 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
1283 | unsigned long len, unsigned long flags, | |
5a6fe125 | 1284 | unsigned int vm_flags, unsigned long pgoff); |
1da177e4 LT |
1285 | |
1286 | static inline unsigned long do_mmap(struct file *file, unsigned long addr, | |
1287 | unsigned long len, unsigned long prot, | |
1288 | unsigned long flag, unsigned long offset) | |
1289 | { | |
1290 | unsigned long ret = -EINVAL; | |
1291 | if ((offset + PAGE_ALIGN(len)) < offset) | |
1292 | goto out; | |
1293 | if (!(offset & ~PAGE_MASK)) | |
1294 | ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT); | |
1295 | out: | |
1296 | return ret; | |
1297 | } | |
1298 | ||
1299 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); | |
1300 | ||
1301 | extern unsigned long do_brk(unsigned long, unsigned long); | |
1302 | ||
1303 | /* filemap.c */ | |
1304 | extern unsigned long page_unuse(struct page *); | |
1305 | extern void truncate_inode_pages(struct address_space *, loff_t); | |
d7339071 HR |
1306 | extern void truncate_inode_pages_range(struct address_space *, |
1307 | loff_t lstart, loff_t lend); | |
1da177e4 LT |
1308 | |
1309 | /* generic vm_area_ops exported for stackable file systems */ | |
d0217ac0 | 1310 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
1da177e4 LT |
1311 | |
1312 | /* mm/page-writeback.c */ | |
1313 | int write_one_page(struct page *page, int wait); | |
1cf6e7d8 | 1314 | void task_dirty_inc(struct task_struct *tsk); |
1da177e4 LT |
1315 | |
1316 | /* readahead.c */ | |
1317 | #define VM_MAX_READAHEAD 128 /* kbytes */ | |
1318 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ | |
1da177e4 | 1319 | |
1da177e4 | 1320 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
7361f4d8 | 1321 | pgoff_t offset, unsigned long nr_to_read); |
cf914a7d RR |
1322 | |
1323 | void page_cache_sync_readahead(struct address_space *mapping, | |
1324 | struct file_ra_state *ra, | |
1325 | struct file *filp, | |
1326 | pgoff_t offset, | |
1327 | unsigned long size); | |
1328 | ||
1329 | void page_cache_async_readahead(struct address_space *mapping, | |
1330 | struct file_ra_state *ra, | |
1331 | struct file *filp, | |
1332 | struct page *pg, | |
1333 | pgoff_t offset, | |
1334 | unsigned long size); | |
1335 | ||
1da177e4 | 1336 | unsigned long max_sane_readahead(unsigned long nr); |
d30a1100 WF |
1337 | unsigned long ra_submit(struct file_ra_state *ra, |
1338 | struct address_space *mapping, | |
1339 | struct file *filp); | |
1da177e4 LT |
1340 | |
1341 | /* Do stack extension */ | |
46dea3d0 | 1342 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 | 1343 | #if VM_GROWSUP |
46dea3d0 | 1344 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 TL |
1345 | #else |
1346 | #define expand_upwards(vma, address) do { } while (0) | |
9ab88515 | 1347 | #endif |
b6a2fea3 OW |
1348 | extern int expand_stack_downwards(struct vm_area_struct *vma, |
1349 | unsigned long address); | |
1da177e4 LT |
1350 | |
1351 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
1352 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
1353 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
1354 | struct vm_area_struct **pprev); | |
1355 | ||
1356 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, | |
1357 | NULL if none. Assume start_addr < end_addr. */ | |
1358 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) | |
1359 | { | |
1360 | struct vm_area_struct * vma = find_vma(mm,start_addr); | |
1361 | ||
1362 | if (vma && end_addr <= vma->vm_start) | |
1363 | vma = NULL; | |
1364 | return vma; | |
1365 | } | |
1366 | ||
1367 | static inline unsigned long vma_pages(struct vm_area_struct *vma) | |
1368 | { | |
1369 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
1370 | } | |
1371 | ||
bad849b3 | 1372 | #ifdef CONFIG_MMU |
804af2cf | 1373 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
bad849b3 DH |
1374 | #else |
1375 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
1376 | { | |
1377 | return __pgprot(0); | |
1378 | } | |
1379 | #endif | |
1380 | ||
deceb6cd | 1381 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
deceb6cd HD |
1382 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
1383 | unsigned long pfn, unsigned long size, pgprot_t); | |
a145dd41 | 1384 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
e0dc0d8f NP |
1385 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
1386 | unsigned long pfn); | |
423bad60 NP |
1387 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
1388 | unsigned long pfn); | |
deceb6cd | 1389 | |
6aab341e | 1390 | struct page *follow_page(struct vm_area_struct *, unsigned long address, |
deceb6cd HD |
1391 | unsigned int foll_flags); |
1392 | #define FOLL_WRITE 0x01 /* check pte is writable */ | |
1393 | #define FOLL_TOUCH 0x02 /* mark page accessed */ | |
1394 | #define FOLL_GET 0x04 /* do get_page on page */ | |
8e4b9a60 | 1395 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
58fa879e | 1396 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
1da177e4 | 1397 | |
2f569afd | 1398 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
aee16b3c JF |
1399 | void *data); |
1400 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, | |
1401 | unsigned long size, pte_fn_t fn, void *data); | |
1402 | ||
1da177e4 | 1403 | #ifdef CONFIG_PROC_FS |
ab50b8ed | 1404 | void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); |
1da177e4 | 1405 | #else |
ab50b8ed | 1406 | static inline void vm_stat_account(struct mm_struct *mm, |
1da177e4 LT |
1407 | unsigned long flags, struct file *file, long pages) |
1408 | { | |
1409 | } | |
1410 | #endif /* CONFIG_PROC_FS */ | |
1411 | ||
12d6f21e IM |
1412 | #ifdef CONFIG_DEBUG_PAGEALLOC |
1413 | extern int debug_pagealloc_enabled; | |
1414 | ||
1415 | extern void kernel_map_pages(struct page *page, int numpages, int enable); | |
1416 | ||
1417 | static inline void enable_debug_pagealloc(void) | |
1418 | { | |
1419 | debug_pagealloc_enabled = 1; | |
1420 | } | |
8a235efa RW |
1421 | #ifdef CONFIG_HIBERNATION |
1422 | extern bool kernel_page_present(struct page *page); | |
1423 | #endif /* CONFIG_HIBERNATION */ | |
12d6f21e | 1424 | #else |
1da177e4 | 1425 | static inline void |
9858db50 | 1426 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
12d6f21e IM |
1427 | static inline void enable_debug_pagealloc(void) |
1428 | { | |
1429 | } | |
8a235efa RW |
1430 | #ifdef CONFIG_HIBERNATION |
1431 | static inline bool kernel_page_present(struct page *page) { return true; } | |
1432 | #endif /* CONFIG_HIBERNATION */ | |
1da177e4 LT |
1433 | #endif |
1434 | ||
1435 | extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk); | |
1436 | #ifdef __HAVE_ARCH_GATE_AREA | |
1437 | int in_gate_area_no_task(unsigned long addr); | |
1438 | int in_gate_area(struct task_struct *task, unsigned long addr); | |
1439 | #else | |
1440 | int in_gate_area_no_task(unsigned long addr); | |
1441 | #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);}) | |
1442 | #endif /* __HAVE_ARCH_GATE_AREA */ | |
1443 | ||
8d65af78 | 1444 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
9d0243bc | 1445 | void __user *, size_t *, loff_t *); |
69e05944 | 1446 | unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask, |
9d0243bc | 1447 | unsigned long lru_pages); |
9d0243bc | 1448 | |
7a9166e3 LY |
1449 | #ifndef CONFIG_MMU |
1450 | #define randomize_va_space 0 | |
1451 | #else | |
a62eaf15 | 1452 | extern int randomize_va_space; |
7a9166e3 | 1453 | #endif |
a62eaf15 | 1454 | |
045e72ac | 1455 | const char * arch_vma_name(struct vm_area_struct *vma); |
03252919 | 1456 | void print_vma_addr(char *prefix, unsigned long rip); |
e6e5494c | 1457 | |
9bdac914 YL |
1458 | void sparse_mem_maps_populate_node(struct page **map_map, |
1459 | unsigned long pnum_begin, | |
1460 | unsigned long pnum_end, | |
1461 | unsigned long map_count, | |
1462 | int nodeid); | |
1463 | ||
98f3cfc1 | 1464 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
29c71111 AW |
1465 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
1466 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); | |
1467 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); | |
1468 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); | |
8f6aac41 | 1469 | void *vmemmap_alloc_block(unsigned long size, int node); |
9bdac914 | 1470 | void *vmemmap_alloc_block_buf(unsigned long size, int node); |
8f6aac41 | 1471 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
29c71111 AW |
1472 | int vmemmap_populate_basepages(struct page *start_page, |
1473 | unsigned long pages, int node); | |
1474 | int vmemmap_populate(struct page *start_page, unsigned long pages, int node); | |
c2b91e2e | 1475 | void vmemmap_populate_print_last(void); |
8f6aac41 | 1476 | |
6a46079c | 1477 | |
82ba011b AK |
1478 | enum mf_flags { |
1479 | MF_COUNT_INCREASED = 1 << 0, | |
1480 | }; | |
6a46079c | 1481 | extern void memory_failure(unsigned long pfn, int trapno); |
82ba011b | 1482 | extern int __memory_failure(unsigned long pfn, int trapno, int flags); |
847ce401 | 1483 | extern int unpoison_memory(unsigned long pfn); |
6a46079c AK |
1484 | extern int sysctl_memory_failure_early_kill; |
1485 | extern int sysctl_memory_failure_recovery; | |
facb6011 | 1486 | extern void shake_page(struct page *p, int access); |
6a46079c | 1487 | extern atomic_long_t mce_bad_pages; |
facb6011 | 1488 | extern int soft_offline_page(struct page *page, int flags); |
bf998156 HY |
1489 | #ifdef CONFIG_MEMORY_FAILURE |
1490 | int is_hwpoison_address(unsigned long addr); | |
1491 | #else | |
1492 | static inline int is_hwpoison_address(unsigned long addr) | |
1493 | { | |
1494 | return 0; | |
1495 | } | |
1496 | #endif | |
6a46079c | 1497 | |
718a3821 WF |
1498 | extern void dump_page(struct page *page); |
1499 | ||
1da177e4 LT |
1500 | #endif /* __KERNEL__ */ |
1501 | #endif /* _LINUX_MM_H */ |