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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 | ||
309381fe | 8 | #include <linux/mmdebug.h> |
1da177e4 | 9 | #include <linux/gfp.h> |
187f1882 | 10 | #include <linux/bug.h> |
1da177e4 LT |
11 | #include <linux/list.h> |
12 | #include <linux/mmzone.h> | |
13 | #include <linux/rbtree.h> | |
83aeeada | 14 | #include <linux/atomic.h> |
9a11b49a | 15 | #include <linux/debug_locks.h> |
5b99cd0e | 16 | #include <linux/mm_types.h> |
08677214 | 17 | #include <linux/range.h> |
c6f6b596 | 18 | #include <linux/pfn.h> |
e9da73d6 | 19 | #include <linux/bit_spinlock.h> |
b0d40c92 | 20 | #include <linux/shrinker.h> |
9c599024 | 21 | #include <linux/resource.h> |
1da177e4 LT |
22 | |
23 | struct mempolicy; | |
24 | struct anon_vma; | |
bf181b9f | 25 | struct anon_vma_chain; |
4e950f6f | 26 | struct file_ra_state; |
e8edc6e0 | 27 | struct user_struct; |
4e950f6f | 28 | struct writeback_control; |
1da177e4 | 29 | |
fccc9987 | 30 | #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */ |
1da177e4 | 31 | extern unsigned long max_mapnr; |
fccc9987 JL |
32 | |
33 | static inline void set_max_mapnr(unsigned long limit) | |
34 | { | |
35 | max_mapnr = limit; | |
36 | } | |
37 | #else | |
38 | static inline void set_max_mapnr(unsigned long limit) { } | |
1da177e4 LT |
39 | #endif |
40 | ||
4481374c | 41 | extern unsigned long totalram_pages; |
1da177e4 | 42 | extern void * high_memory; |
1da177e4 LT |
43 | extern int page_cluster; |
44 | ||
45 | #ifdef CONFIG_SYSCTL | |
46 | extern int sysctl_legacy_va_layout; | |
47 | #else | |
48 | #define sysctl_legacy_va_layout 0 | |
49 | #endif | |
50 | ||
51 | #include <asm/page.h> | |
52 | #include <asm/pgtable.h> | |
53 | #include <asm/processor.h> | |
1da177e4 | 54 | |
79442ed1 TC |
55 | #ifndef __pa_symbol |
56 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) | |
57 | #endif | |
58 | ||
c9b1d098 | 59 | extern unsigned long sysctl_user_reserve_kbytes; |
4eeab4f5 | 60 | extern unsigned long sysctl_admin_reserve_kbytes; |
c9b1d098 | 61 | |
49f0ce5f JM |
62 | extern int sysctl_overcommit_memory; |
63 | extern int sysctl_overcommit_ratio; | |
64 | extern unsigned long sysctl_overcommit_kbytes; | |
65 | ||
66 | extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *, | |
67 | size_t *, loff_t *); | |
68 | extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, | |
69 | size_t *, loff_t *); | |
70 | ||
1da177e4 LT |
71 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
72 | ||
27ac792c AR |
73 | /* to align the pointer to the (next) page boundary */ |
74 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
75 | ||
0fa73b86 AM |
76 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
77 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE) | |
78 | ||
1da177e4 LT |
79 | /* |
80 | * Linux kernel virtual memory manager primitives. | |
81 | * The idea being to have a "virtual" mm in the same way | |
82 | * we have a virtual fs - giving a cleaner interface to the | |
83 | * mm details, and allowing different kinds of memory mappings | |
84 | * (from shared memory to executable loading to arbitrary | |
85 | * mmap() functions). | |
86 | */ | |
87 | ||
c43692e8 CL |
88 | extern struct kmem_cache *vm_area_cachep; |
89 | ||
1da177e4 | 90 | #ifndef CONFIG_MMU |
8feae131 DH |
91 | extern struct rb_root nommu_region_tree; |
92 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
93 | |
94 | extern unsigned int kobjsize(const void *objp); | |
95 | #endif | |
96 | ||
97 | /* | |
605d9288 | 98 | * vm_flags in vm_area_struct, see mm_types.h. |
1da177e4 | 99 | */ |
cc2383ec KK |
100 | #define VM_NONE 0x00000000 |
101 | ||
1da177e4 LT |
102 | #define VM_READ 0x00000001 /* currently active flags */ |
103 | #define VM_WRITE 0x00000002 | |
104 | #define VM_EXEC 0x00000004 | |
105 | #define VM_SHARED 0x00000008 | |
106 | ||
7e2cff42 | 107 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
108 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
109 | #define VM_MAYWRITE 0x00000020 | |
110 | #define VM_MAYEXEC 0x00000040 | |
111 | #define VM_MAYSHARE 0x00000080 | |
112 | ||
113 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
6aab341e | 114 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
1da177e4 LT |
115 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
116 | ||
1da177e4 LT |
117 | #define VM_LOCKED 0x00002000 |
118 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
119 | ||
120 | /* Used by sys_madvise() */ | |
121 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
122 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
123 | ||
124 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
125 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
1da177e4 | 126 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 127 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 LT |
128 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
129 | #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */ | |
cc2383ec | 130 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
0103bd16 | 131 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
d00806b1 | 132 | |
d9104d1c CG |
133 | #ifdef CONFIG_MEM_SOFT_DIRTY |
134 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ | |
135 | #else | |
136 | # define VM_SOFTDIRTY 0 | |
137 | #endif | |
138 | ||
b379d790 | 139 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
cc2383ec KK |
140 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
141 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ | |
f8af4da3 | 142 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 143 | |
cc2383ec KK |
144 | #if defined(CONFIG_X86) |
145 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ | |
146 | #elif defined(CONFIG_PPC) | |
147 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ | |
148 | #elif defined(CONFIG_PARISC) | |
149 | # define VM_GROWSUP VM_ARCH_1 | |
9ca52ed9 JH |
150 | #elif defined(CONFIG_METAG) |
151 | # define VM_GROWSUP VM_ARCH_1 | |
cc2383ec KK |
152 | #elif defined(CONFIG_IA64) |
153 | # define VM_GROWSUP VM_ARCH_1 | |
154 | #elif !defined(CONFIG_MMU) | |
155 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ | |
156 | #endif | |
157 | ||
158 | #ifndef VM_GROWSUP | |
159 | # define VM_GROWSUP VM_NONE | |
160 | #endif | |
161 | ||
a8bef8ff MG |
162 | /* Bits set in the VMA until the stack is in its final location */ |
163 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) | |
164 | ||
1da177e4 LT |
165 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
166 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
167 | #endif | |
168 | ||
169 | #ifdef CONFIG_STACK_GROWSUP | |
170 | #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) | |
171 | #else | |
172 | #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) | |
173 | #endif | |
174 | ||
b291f000 | 175 | /* |
78f11a25 AA |
176 | * Special vmas that are non-mergable, non-mlock()able. |
177 | * Note: mm/huge_memory.c VM_NO_THP depends on this definition. | |
b291f000 | 178 | */ |
9050d7eb | 179 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
b291f000 | 180 | |
a0715cc2 AT |
181 | /* This mask defines which mm->def_flags a process can inherit its parent */ |
182 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE | |
183 | ||
1da177e4 LT |
184 | /* |
185 | * mapping from the currently active vm_flags protection bits (the | |
186 | * low four bits) to a page protection mask.. | |
187 | */ | |
188 | extern pgprot_t protection_map[16]; | |
189 | ||
d0217ac0 NP |
190 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
191 | #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ | |
c2ec175c | 192 | #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */ |
d065bd81 | 193 | #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */ |
318b275f | 194 | #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */ |
37b23e05 | 195 | #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */ |
45cac65b | 196 | #define FAULT_FLAG_TRIED 0x40 /* second try */ |
759496ba | 197 | #define FAULT_FLAG_USER 0x80 /* The fault originated in userspace */ |
d0217ac0 | 198 | |
54cb8821 | 199 | /* |
d0217ac0 | 200 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
83c54070 NP |
201 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
202 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 203 | * |
d0217ac0 | 204 | * pgoff should be used in favour of virtual_address, if possible. If pgoff |
0b173bc4 | 205 | * is used, one may implement ->remap_pages to get nonlinear mapping support. |
54cb8821 | 206 | */ |
d0217ac0 NP |
207 | struct vm_fault { |
208 | unsigned int flags; /* FAULT_FLAG_xxx flags */ | |
209 | pgoff_t pgoff; /* Logical page offset based on vma */ | |
210 | void __user *virtual_address; /* Faulting virtual address */ | |
211 | ||
212 | struct page *page; /* ->fault handlers should return a | |
83c54070 | 213 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 214 | * is set (which is also implied by |
83c54070 | 215 | * VM_FAULT_ERROR). |
d0217ac0 | 216 | */ |
8c6e50b0 KS |
217 | /* for ->map_pages() only */ |
218 | pgoff_t max_pgoff; /* map pages for offset from pgoff till | |
219 | * max_pgoff inclusive */ | |
220 | pte_t *pte; /* pte entry associated with ->pgoff */ | |
54cb8821 | 221 | }; |
1da177e4 LT |
222 | |
223 | /* | |
224 | * These are the virtual MM functions - opening of an area, closing and | |
225 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
226 | * to the functions called when a no-page or a wp-page exception occurs. | |
227 | */ | |
228 | struct vm_operations_struct { | |
229 | void (*open)(struct vm_area_struct * area); | |
230 | void (*close)(struct vm_area_struct * area); | |
d0217ac0 | 231 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
8c6e50b0 | 232 | void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf); |
9637a5ef DH |
233 | |
234 | /* notification that a previously read-only page is about to become | |
235 | * writable, if an error is returned it will cause a SIGBUS */ | |
c2ec175c | 236 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
28b2ee20 RR |
237 | |
238 | /* called by access_process_vm when get_user_pages() fails, typically | |
239 | * for use by special VMAs that can switch between memory and hardware | |
240 | */ | |
241 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
242 | void *buf, int len, int write); | |
78d683e8 AL |
243 | |
244 | /* Called by the /proc/PID/maps code to ask the vma whether it | |
245 | * has a special name. Returning non-NULL will also cause this | |
246 | * vma to be dumped unconditionally. */ | |
247 | const char *(*name)(struct vm_area_struct *vma); | |
248 | ||
1da177e4 | 249 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
250 | /* |
251 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
252 | * to hold the policy upon return. Caller should pass NULL @new to | |
253 | * remove a policy and fall back to surrounding context--i.e. do not | |
254 | * install a MPOL_DEFAULT policy, nor the task or system default | |
255 | * mempolicy. | |
256 | */ | |
1da177e4 | 257 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
258 | |
259 | /* | |
260 | * get_policy() op must add reference [mpol_get()] to any policy at | |
261 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
262 | * in mm/mempolicy.c will do this automatically. | |
263 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
264 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. | |
265 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op | |
266 | * must return NULL--i.e., do not "fallback" to task or system default | |
267 | * policy. | |
268 | */ | |
1da177e4 LT |
269 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
270 | unsigned long addr); | |
7b2259b3 CL |
271 | int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, |
272 | const nodemask_t *to, unsigned long flags); | |
1da177e4 | 273 | #endif |
0b173bc4 KK |
274 | /* called by sys_remap_file_pages() to populate non-linear mapping */ |
275 | int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr, | |
276 | unsigned long size, pgoff_t pgoff); | |
1da177e4 LT |
277 | }; |
278 | ||
279 | struct mmu_gather; | |
280 | struct inode; | |
281 | ||
349aef0b AM |
282 | #define page_private(page) ((page)->private) |
283 | #define set_page_private(page, v) ((page)->private = (v)) | |
4c21e2f2 | 284 | |
b12c4ad1 MK |
285 | /* It's valid only if the page is free path or free_list */ |
286 | static inline void set_freepage_migratetype(struct page *page, int migratetype) | |
287 | { | |
95e34412 | 288 | page->index = migratetype; |
b12c4ad1 MK |
289 | } |
290 | ||
291 | /* It's valid only if the page is free path or free_list */ | |
292 | static inline int get_freepage_migratetype(struct page *page) | |
293 | { | |
95e34412 | 294 | return page->index; |
b12c4ad1 MK |
295 | } |
296 | ||
1da177e4 LT |
297 | /* |
298 | * FIXME: take this include out, include page-flags.h in | |
299 | * files which need it (119 of them) | |
300 | */ | |
301 | #include <linux/page-flags.h> | |
71e3aac0 | 302 | #include <linux/huge_mm.h> |
1da177e4 LT |
303 | |
304 | /* | |
305 | * Methods to modify the page usage count. | |
306 | * | |
307 | * What counts for a page usage: | |
308 | * - cache mapping (page->mapping) | |
309 | * - private data (page->private) | |
310 | * - page mapped in a task's page tables, each mapping | |
311 | * is counted separately | |
312 | * | |
313 | * Also, many kernel routines increase the page count before a critical | |
314 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
315 | */ |
316 | ||
317 | /* | |
da6052f7 | 318 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 319 | */ |
7c8ee9a8 NP |
320 | static inline int put_page_testzero(struct page *page) |
321 | { | |
309381fe | 322 | VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page); |
8dc04efb | 323 | return atomic_dec_and_test(&page->_count); |
7c8ee9a8 | 324 | } |
1da177e4 LT |
325 | |
326 | /* | |
7c8ee9a8 NP |
327 | * Try to grab a ref unless the page has a refcount of zero, return false if |
328 | * that is the case. | |
8e0861fa AK |
329 | * This can be called when MMU is off so it must not access |
330 | * any of the virtual mappings. | |
1da177e4 | 331 | */ |
7c8ee9a8 NP |
332 | static inline int get_page_unless_zero(struct page *page) |
333 | { | |
8dc04efb | 334 | return atomic_inc_not_zero(&page->_count); |
7c8ee9a8 | 335 | } |
1da177e4 | 336 | |
8e0861fa AK |
337 | /* |
338 | * Try to drop a ref unless the page has a refcount of one, return false if | |
339 | * that is the case. | |
340 | * This is to make sure that the refcount won't become zero after this drop. | |
341 | * This can be called when MMU is off so it must not access | |
342 | * any of the virtual mappings. | |
343 | */ | |
344 | static inline int put_page_unless_one(struct page *page) | |
345 | { | |
346 | return atomic_add_unless(&page->_count, -1, 1); | |
347 | } | |
348 | ||
53df8fdc WF |
349 | extern int page_is_ram(unsigned long pfn); |
350 | ||
48667e7a | 351 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
352 | struct page *vmalloc_to_page(const void *addr); |
353 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 354 | |
0738c4bb PM |
355 | /* |
356 | * Determine if an address is within the vmalloc range | |
357 | * | |
358 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
359 | * is no special casing required. | |
360 | */ | |
9e2779fa CL |
361 | static inline int is_vmalloc_addr(const void *x) |
362 | { | |
0738c4bb | 363 | #ifdef CONFIG_MMU |
9e2779fa CL |
364 | unsigned long addr = (unsigned long)x; |
365 | ||
366 | return addr >= VMALLOC_START && addr < VMALLOC_END; | |
0738c4bb PM |
367 | #else |
368 | return 0; | |
8ca3ed87 | 369 | #endif |
0738c4bb | 370 | } |
81ac3ad9 KH |
371 | #ifdef CONFIG_MMU |
372 | extern int is_vmalloc_or_module_addr(const void *x); | |
373 | #else | |
934831d0 | 374 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
375 | { |
376 | return 0; | |
377 | } | |
378 | #endif | |
9e2779fa | 379 | |
39f1f78d AV |
380 | extern void kvfree(const void *addr); |
381 | ||
e9da73d6 AA |
382 | static inline void compound_lock(struct page *page) |
383 | { | |
384 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 385 | VM_BUG_ON_PAGE(PageSlab(page), page); |
e9da73d6 AA |
386 | bit_spin_lock(PG_compound_lock, &page->flags); |
387 | #endif | |
388 | } | |
389 | ||
390 | static inline void compound_unlock(struct page *page) | |
391 | { | |
392 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 393 | VM_BUG_ON_PAGE(PageSlab(page), page); |
e9da73d6 AA |
394 | bit_spin_unlock(PG_compound_lock, &page->flags); |
395 | #endif | |
396 | } | |
397 | ||
398 | static inline unsigned long compound_lock_irqsave(struct page *page) | |
399 | { | |
400 | unsigned long uninitialized_var(flags); | |
401 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
402 | local_irq_save(flags); | |
403 | compound_lock(page); | |
404 | #endif | |
405 | return flags; | |
406 | } | |
407 | ||
408 | static inline void compound_unlock_irqrestore(struct page *page, | |
409 | unsigned long flags) | |
410 | { | |
411 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
412 | compound_unlock(page); | |
413 | local_irq_restore(flags); | |
414 | #endif | |
415 | } | |
416 | ||
d2ee40ea JZ |
417 | static inline struct page *compound_head_by_tail(struct page *tail) |
418 | { | |
419 | struct page *head = tail->first_page; | |
420 | ||
421 | /* | |
422 | * page->first_page may be a dangling pointer to an old | |
423 | * compound page, so recheck that it is still a tail | |
424 | * page before returning. | |
425 | */ | |
426 | smp_rmb(); | |
427 | if (likely(PageTail(tail))) | |
428 | return head; | |
429 | return tail; | |
430 | } | |
431 | ||
d85f3385 CL |
432 | static inline struct page *compound_head(struct page *page) |
433 | { | |
d2ee40ea JZ |
434 | if (unlikely(PageTail(page))) |
435 | return compound_head_by_tail(page); | |
d85f3385 CL |
436 | return page; |
437 | } | |
438 | ||
70b50f94 AA |
439 | /* |
440 | * The atomic page->_mapcount, starts from -1: so that transitions | |
441 | * both from it and to it can be tracked, using atomic_inc_and_test | |
442 | * and atomic_add_negative(-1). | |
443 | */ | |
22b751c3 | 444 | static inline void page_mapcount_reset(struct page *page) |
70b50f94 AA |
445 | { |
446 | atomic_set(&(page)->_mapcount, -1); | |
447 | } | |
448 | ||
449 | static inline int page_mapcount(struct page *page) | |
450 | { | |
451 | return atomic_read(&(page)->_mapcount) + 1; | |
452 | } | |
453 | ||
4c21e2f2 | 454 | static inline int page_count(struct page *page) |
1da177e4 | 455 | { |
d85f3385 | 456 | return atomic_read(&compound_head(page)->_count); |
1da177e4 LT |
457 | } |
458 | ||
44518d2b AA |
459 | #ifdef CONFIG_HUGETLB_PAGE |
460 | extern int PageHeadHuge(struct page *page_head); | |
461 | #else /* CONFIG_HUGETLB_PAGE */ | |
462 | static inline int PageHeadHuge(struct page *page_head) | |
463 | { | |
464 | return 0; | |
465 | } | |
466 | #endif /* CONFIG_HUGETLB_PAGE */ | |
467 | ||
468 | static inline bool __compound_tail_refcounted(struct page *page) | |
469 | { | |
470 | return !PageSlab(page) && !PageHeadHuge(page); | |
471 | } | |
472 | ||
473 | /* | |
474 | * This takes a head page as parameter and tells if the | |
475 | * tail page reference counting can be skipped. | |
476 | * | |
477 | * For this to be safe, PageSlab and PageHeadHuge must remain true on | |
478 | * any given page where they return true here, until all tail pins | |
479 | * have been released. | |
480 | */ | |
481 | static inline bool compound_tail_refcounted(struct page *page) | |
482 | { | |
309381fe | 483 | VM_BUG_ON_PAGE(!PageHead(page), page); |
44518d2b AA |
484 | return __compound_tail_refcounted(page); |
485 | } | |
486 | ||
b35a35b5 AA |
487 | static inline void get_huge_page_tail(struct page *page) |
488 | { | |
489 | /* | |
5eaf1a9e | 490 | * __split_huge_page_refcount() cannot run from under us. |
b35a35b5 | 491 | */ |
309381fe SL |
492 | VM_BUG_ON_PAGE(!PageTail(page), page); |
493 | VM_BUG_ON_PAGE(page_mapcount(page) < 0, page); | |
494 | VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page); | |
5eaf1a9e | 495 | if (compound_tail_refcounted(page->first_page)) |
44518d2b | 496 | atomic_inc(&page->_mapcount); |
b35a35b5 AA |
497 | } |
498 | ||
70b50f94 AA |
499 | extern bool __get_page_tail(struct page *page); |
500 | ||
1da177e4 LT |
501 | static inline void get_page(struct page *page) |
502 | { | |
70b50f94 AA |
503 | if (unlikely(PageTail(page))) |
504 | if (likely(__get_page_tail(page))) | |
505 | return; | |
91807063 AA |
506 | /* |
507 | * Getting a normal page or the head of a compound page | |
70b50f94 | 508 | * requires to already have an elevated page->_count. |
91807063 | 509 | */ |
309381fe | 510 | VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page); |
1da177e4 LT |
511 | atomic_inc(&page->_count); |
512 | } | |
513 | ||
b49af68f CL |
514 | static inline struct page *virt_to_head_page(const void *x) |
515 | { | |
516 | struct page *page = virt_to_page(x); | |
517 | return compound_head(page); | |
518 | } | |
519 | ||
7835e98b NP |
520 | /* |
521 | * Setup the page count before being freed into the page allocator for | |
522 | * the first time (boot or memory hotplug) | |
523 | */ | |
524 | static inline void init_page_count(struct page *page) | |
525 | { | |
526 | atomic_set(&page->_count, 1); | |
527 | } | |
528 | ||
5f24ce5f AA |
529 | /* |
530 | * PageBuddy() indicate that the page is free and in the buddy system | |
531 | * (see mm/page_alloc.c). | |
ef2b4b95 AA |
532 | * |
533 | * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to | |
534 | * -2 so that an underflow of the page_mapcount() won't be mistaken | |
535 | * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very | |
536 | * efficiently by most CPU architectures. | |
5f24ce5f | 537 | */ |
ef2b4b95 AA |
538 | #define PAGE_BUDDY_MAPCOUNT_VALUE (-128) |
539 | ||
5f24ce5f AA |
540 | static inline int PageBuddy(struct page *page) |
541 | { | |
ef2b4b95 | 542 | return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE; |
5f24ce5f AA |
543 | } |
544 | ||
545 | static inline void __SetPageBuddy(struct page *page) | |
546 | { | |
309381fe | 547 | VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page); |
ef2b4b95 | 548 | atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE); |
5f24ce5f AA |
549 | } |
550 | ||
551 | static inline void __ClearPageBuddy(struct page *page) | |
552 | { | |
309381fe | 553 | VM_BUG_ON_PAGE(!PageBuddy(page), page); |
5f24ce5f AA |
554 | atomic_set(&page->_mapcount, -1); |
555 | } | |
556 | ||
d6d86c0a KK |
557 | #define PAGE_BALLOON_MAPCOUNT_VALUE (-256) |
558 | ||
559 | static inline int PageBalloon(struct page *page) | |
560 | { | |
561 | return atomic_read(&page->_mapcount) == PAGE_BALLOON_MAPCOUNT_VALUE; | |
562 | } | |
563 | ||
564 | static inline void __SetPageBalloon(struct page *page) | |
565 | { | |
566 | VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page); | |
567 | atomic_set(&page->_mapcount, PAGE_BALLOON_MAPCOUNT_VALUE); | |
568 | } | |
569 | ||
570 | static inline void __ClearPageBalloon(struct page *page) | |
571 | { | |
572 | VM_BUG_ON_PAGE(!PageBalloon(page), page); | |
573 | atomic_set(&page->_mapcount, -1); | |
574 | } | |
575 | ||
1da177e4 | 576 | void put_page(struct page *page); |
1d7ea732 | 577 | void put_pages_list(struct list_head *pages); |
1da177e4 | 578 | |
8dfcc9ba | 579 | void split_page(struct page *page, unsigned int order); |
748446bb | 580 | int split_free_page(struct page *page); |
8dfcc9ba | 581 | |
33f2ef89 AW |
582 | /* |
583 | * Compound pages have a destructor function. Provide a | |
584 | * prototype for that function and accessor functions. | |
585 | * These are _only_ valid on the head of a PG_compound page. | |
586 | */ | |
587 | typedef void compound_page_dtor(struct page *); | |
588 | ||
589 | static inline void set_compound_page_dtor(struct page *page, | |
590 | compound_page_dtor *dtor) | |
591 | { | |
592 | page[1].lru.next = (void *)dtor; | |
593 | } | |
594 | ||
595 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) | |
596 | { | |
597 | return (compound_page_dtor *)page[1].lru.next; | |
598 | } | |
599 | ||
d85f3385 CL |
600 | static inline int compound_order(struct page *page) |
601 | { | |
6d777953 | 602 | if (!PageHead(page)) |
d85f3385 CL |
603 | return 0; |
604 | return (unsigned long)page[1].lru.prev; | |
605 | } | |
606 | ||
607 | static inline void set_compound_order(struct page *page, unsigned long order) | |
608 | { | |
609 | page[1].lru.prev = (void *)order; | |
610 | } | |
611 | ||
3dece370 | 612 | #ifdef CONFIG_MMU |
14fd403f AA |
613 | /* |
614 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when | |
615 | * servicing faults for write access. In the normal case, do always want | |
616 | * pte_mkwrite. But get_user_pages can cause write faults for mappings | |
617 | * that do not have writing enabled, when used by access_process_vm. | |
618 | */ | |
619 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) | |
620 | { | |
621 | if (likely(vma->vm_flags & VM_WRITE)) | |
622 | pte = pte_mkwrite(pte); | |
623 | return pte; | |
624 | } | |
8c6e50b0 KS |
625 | |
626 | void do_set_pte(struct vm_area_struct *vma, unsigned long address, | |
627 | struct page *page, pte_t *pte, bool write, bool anon); | |
3dece370 | 628 | #endif |
14fd403f | 629 | |
1da177e4 LT |
630 | /* |
631 | * Multiple processes may "see" the same page. E.g. for untouched | |
632 | * mappings of /dev/null, all processes see the same page full of | |
633 | * zeroes, and text pages of executables and shared libraries have | |
634 | * only one copy in memory, at most, normally. | |
635 | * | |
636 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
637 | * page_count() == 0 means the page is free. page->lru is then used for |
638 | * freelist management in the buddy allocator. | |
da6052f7 | 639 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 640 | * |
da6052f7 NP |
641 | * Pages are allocated by the slab allocator in order to provide memory |
642 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
643 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
644 | * unless a particular usage is carefully commented. (the responsibility of | |
645 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 646 | * |
da6052f7 NP |
647 | * A page may be used by anyone else who does a __get_free_page(). |
648 | * In this case, page_count still tracks the references, and should only | |
649 | * be used through the normal accessor functions. The top bits of page->flags | |
650 | * and page->virtual store page management information, but all other fields | |
651 | * are unused and could be used privately, carefully. The management of this | |
652 | * page is the responsibility of the one who allocated it, and those who have | |
653 | * subsequently been given references to it. | |
654 | * | |
655 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
656 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
657 | * The following discussion applies only to them. | |
658 | * | |
da6052f7 NP |
659 | * A pagecache page contains an opaque `private' member, which belongs to the |
660 | * page's address_space. Usually, this is the address of a circular list of | |
661 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
662 | * into the filesystem to release these pages. | |
1da177e4 | 663 | * |
da6052f7 NP |
664 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
665 | * is the pointer to the inode, and page->index is the file offset of the page, | |
666 | * in units of PAGE_CACHE_SIZE. | |
1da177e4 | 667 | * |
da6052f7 NP |
668 | * If pagecache pages are not associated with an inode, they are said to be |
669 | * anonymous pages. These may become associated with the swapcache, and in that | |
670 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 671 | * |
da6052f7 NP |
672 | * In either case (swapcache or inode backed), the pagecache itself holds one |
673 | * reference to the page. Setting PG_private should also increment the | |
674 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 675 | * |
da6052f7 NP |
676 | * The pagecache pages are stored in a per-mapping radix tree, which is |
677 | * rooted at mapping->page_tree, and indexed by offset. | |
678 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space | |
679 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 680 | * |
da6052f7 | 681 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
682 | * - inode pages may need to be read from disk, |
683 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
684 | * to be written back to the inode on disk, |
685 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
686 | * modified may need to be swapped out to swap space and (later) to be read | |
687 | * back into memory. | |
1da177e4 LT |
688 | */ |
689 | ||
690 | /* | |
691 | * The zone field is never updated after free_area_init_core() | |
692 | * sets it, so none of the operations on it need to be atomic. | |
1da177e4 | 693 | */ |
348f8b6c | 694 | |
90572890 | 695 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
07808b74 | 696 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
d41dee36 AW |
697 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
698 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
90572890 | 699 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
d41dee36 | 700 | |
348f8b6c | 701 | /* |
25985edc | 702 | * Define the bit shifts to access each section. For non-existent |
348f8b6c DH |
703 | * sections we define the shift as 0; that plus a 0 mask ensures |
704 | * the compiler will optimise away reference to them. | |
705 | */ | |
d41dee36 AW |
706 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
707 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
708 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
90572890 | 709 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
348f8b6c | 710 | |
bce54bbf WD |
711 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
712 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
89689ae7 | 713 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
714 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
715 | SECTIONS_PGOFF : ZONES_PGOFF) | |
d41dee36 | 716 | #else |
89689ae7 | 717 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
718 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
719 | NODES_PGOFF : ZONES_PGOFF) | |
89689ae7 CL |
720 | #endif |
721 | ||
bd8029b6 | 722 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
348f8b6c | 723 | |
9223b419 CL |
724 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
725 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS | |
348f8b6c DH |
726 | #endif |
727 | ||
d41dee36 AW |
728 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
729 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
730 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
834a964a | 731 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) |
89689ae7 | 732 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
348f8b6c | 733 | |
33dd4e0e | 734 | static inline enum zone_type page_zonenum(const struct page *page) |
1da177e4 | 735 | { |
348f8b6c | 736 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
1da177e4 | 737 | } |
1da177e4 | 738 | |
9127ab4f CS |
739 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
740 | #define SECTION_IN_PAGE_FLAGS | |
741 | #endif | |
742 | ||
89689ae7 | 743 | /* |
7a8010cd VB |
744 | * The identification function is mainly used by the buddy allocator for |
745 | * determining if two pages could be buddies. We are not really identifying | |
746 | * the zone since we could be using the section number id if we do not have | |
747 | * node id available in page flags. | |
748 | * We only guarantee that it will return the same value for two combinable | |
749 | * pages in a zone. | |
89689ae7 | 750 | */ |
cb2b95e1 AW |
751 | static inline int page_zone_id(struct page *page) |
752 | { | |
89689ae7 | 753 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
754 | } |
755 | ||
25ba77c1 | 756 | static inline int zone_to_nid(struct zone *zone) |
89fa3024 | 757 | { |
d5f541ed CL |
758 | #ifdef CONFIG_NUMA |
759 | return zone->node; | |
760 | #else | |
761 | return 0; | |
762 | #endif | |
89fa3024 CL |
763 | } |
764 | ||
89689ae7 | 765 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
33dd4e0e | 766 | extern int page_to_nid(const struct page *page); |
89689ae7 | 767 | #else |
33dd4e0e | 768 | static inline int page_to_nid(const struct page *page) |
d41dee36 | 769 | { |
89689ae7 | 770 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
d41dee36 | 771 | } |
89689ae7 CL |
772 | #endif |
773 | ||
57e0a030 | 774 | #ifdef CONFIG_NUMA_BALANCING |
90572890 | 775 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
57e0a030 | 776 | { |
90572890 | 777 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
57e0a030 MG |
778 | } |
779 | ||
90572890 | 780 | static inline int cpupid_to_pid(int cpupid) |
57e0a030 | 781 | { |
90572890 | 782 | return cpupid & LAST__PID_MASK; |
57e0a030 | 783 | } |
b795854b | 784 | |
90572890 | 785 | static inline int cpupid_to_cpu(int cpupid) |
b795854b | 786 | { |
90572890 | 787 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
b795854b MG |
788 | } |
789 | ||
90572890 | 790 | static inline int cpupid_to_nid(int cpupid) |
b795854b | 791 | { |
90572890 | 792 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
b795854b MG |
793 | } |
794 | ||
90572890 | 795 | static inline bool cpupid_pid_unset(int cpupid) |
57e0a030 | 796 | { |
90572890 | 797 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
b795854b MG |
798 | } |
799 | ||
90572890 | 800 | static inline bool cpupid_cpu_unset(int cpupid) |
b795854b | 801 | { |
90572890 | 802 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
b795854b MG |
803 | } |
804 | ||
8c8a743c PZ |
805 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
806 | { | |
807 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); | |
808 | } | |
809 | ||
810 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) | |
90572890 PZ |
811 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
812 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
b795854b | 813 | { |
1ae71d03 | 814 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
b795854b | 815 | } |
90572890 PZ |
816 | |
817 | static inline int page_cpupid_last(struct page *page) | |
818 | { | |
819 | return page->_last_cpupid; | |
820 | } | |
821 | static inline void page_cpupid_reset_last(struct page *page) | |
b795854b | 822 | { |
1ae71d03 | 823 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
57e0a030 MG |
824 | } |
825 | #else | |
90572890 | 826 | static inline int page_cpupid_last(struct page *page) |
75980e97 | 827 | { |
90572890 | 828 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
75980e97 PZ |
829 | } |
830 | ||
90572890 | 831 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
75980e97 | 832 | |
90572890 | 833 | static inline void page_cpupid_reset_last(struct page *page) |
75980e97 | 834 | { |
90572890 | 835 | int cpupid = (1 << LAST_CPUPID_SHIFT) - 1; |
4468b8f1 | 836 | |
90572890 PZ |
837 | page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT); |
838 | page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT; | |
75980e97 | 839 | } |
90572890 PZ |
840 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
841 | #else /* !CONFIG_NUMA_BALANCING */ | |
842 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
57e0a030 | 843 | { |
90572890 | 844 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
845 | } |
846 | ||
90572890 | 847 | static inline int page_cpupid_last(struct page *page) |
57e0a030 | 848 | { |
90572890 | 849 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
850 | } |
851 | ||
90572890 | 852 | static inline int cpupid_to_nid(int cpupid) |
b795854b MG |
853 | { |
854 | return -1; | |
855 | } | |
856 | ||
90572890 | 857 | static inline int cpupid_to_pid(int cpupid) |
b795854b MG |
858 | { |
859 | return -1; | |
860 | } | |
861 | ||
90572890 | 862 | static inline int cpupid_to_cpu(int cpupid) |
b795854b MG |
863 | { |
864 | return -1; | |
865 | } | |
866 | ||
90572890 PZ |
867 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
868 | { | |
869 | return -1; | |
870 | } | |
871 | ||
872 | static inline bool cpupid_pid_unset(int cpupid) | |
b795854b MG |
873 | { |
874 | return 1; | |
875 | } | |
876 | ||
90572890 | 877 | static inline void page_cpupid_reset_last(struct page *page) |
57e0a030 MG |
878 | { |
879 | } | |
8c8a743c PZ |
880 | |
881 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) | |
882 | { | |
883 | return false; | |
884 | } | |
90572890 | 885 | #endif /* CONFIG_NUMA_BALANCING */ |
57e0a030 | 886 | |
33dd4e0e | 887 | static inline struct zone *page_zone(const struct page *page) |
89689ae7 CL |
888 | { |
889 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
890 | } | |
891 | ||
9127ab4f | 892 | #ifdef SECTION_IN_PAGE_FLAGS |
bf4e8902 DK |
893 | static inline void set_page_section(struct page *page, unsigned long section) |
894 | { | |
895 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
896 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
897 | } | |
898 | ||
aa462abe | 899 | static inline unsigned long page_to_section(const struct page *page) |
d41dee36 AW |
900 | { |
901 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
902 | } | |
308c05e3 | 903 | #endif |
d41dee36 | 904 | |
2f1b6248 | 905 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
906 | { |
907 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
908 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
909 | } | |
2f1b6248 | 910 | |
348f8b6c DH |
911 | static inline void set_page_node(struct page *page, unsigned long node) |
912 | { | |
913 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
914 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 915 | } |
89689ae7 | 916 | |
2f1b6248 | 917 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 918 | unsigned long node, unsigned long pfn) |
1da177e4 | 919 | { |
348f8b6c DH |
920 | set_page_zone(page, zone); |
921 | set_page_node(page, node); | |
9127ab4f | 922 | #ifdef SECTION_IN_PAGE_FLAGS |
d41dee36 | 923 | set_page_section(page, pfn_to_section_nr(pfn)); |
bf4e8902 | 924 | #endif |
1da177e4 LT |
925 | } |
926 | ||
f6ac2354 CL |
927 | /* |
928 | * Some inline functions in vmstat.h depend on page_zone() | |
929 | */ | |
930 | #include <linux/vmstat.h> | |
931 | ||
33dd4e0e | 932 | static __always_inline void *lowmem_page_address(const struct page *page) |
1da177e4 | 933 | { |
aa462abe | 934 | return __va(PFN_PHYS(page_to_pfn(page))); |
1da177e4 LT |
935 | } |
936 | ||
937 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) | |
938 | #define HASHED_PAGE_VIRTUAL | |
939 | #endif | |
940 | ||
941 | #if defined(WANT_PAGE_VIRTUAL) | |
f92f455f GU |
942 | static inline void *page_address(const struct page *page) |
943 | { | |
944 | return page->virtual; | |
945 | } | |
946 | static inline void set_page_address(struct page *page, void *address) | |
947 | { | |
948 | page->virtual = address; | |
949 | } | |
1da177e4 LT |
950 | #define page_address_init() do { } while(0) |
951 | #endif | |
952 | ||
953 | #if defined(HASHED_PAGE_VIRTUAL) | |
f9918794 | 954 | void *page_address(const struct page *page); |
1da177e4 LT |
955 | void set_page_address(struct page *page, void *virtual); |
956 | void page_address_init(void); | |
957 | #endif | |
958 | ||
959 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) | |
960 | #define page_address(page) lowmem_page_address(page) | |
961 | #define set_page_address(page, address) do { } while(0) | |
962 | #define page_address_init() do { } while(0) | |
963 | #endif | |
964 | ||
965 | /* | |
966 | * On an anonymous page mapped into a user virtual memory area, | |
967 | * page->mapping points to its anon_vma, not to a struct address_space; | |
3ca7b3c5 HD |
968 | * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. |
969 | * | |
970 | * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled, | |
971 | * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit; | |
972 | * and then page->mapping points, not to an anon_vma, but to a private | |
973 | * structure which KSM associates with that merged page. See ksm.h. | |
974 | * | |
975 | * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used. | |
1da177e4 LT |
976 | * |
977 | * Please note that, confusingly, "page_mapping" refers to the inode | |
978 | * address_space which maps the page from disk; whereas "page_mapped" | |
979 | * refers to user virtual address space into which the page is mapped. | |
980 | */ | |
981 | #define PAGE_MAPPING_ANON 1 | |
3ca7b3c5 HD |
982 | #define PAGE_MAPPING_KSM 2 |
983 | #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM) | |
1da177e4 | 984 | |
9800339b | 985 | extern struct address_space *page_mapping(struct page *page); |
1da177e4 | 986 | |
3ca7b3c5 HD |
987 | /* Neutral page->mapping pointer to address_space or anon_vma or other */ |
988 | static inline void *page_rmapping(struct page *page) | |
989 | { | |
990 | return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS); | |
991 | } | |
992 | ||
f981c595 MG |
993 | extern struct address_space *__page_file_mapping(struct page *); |
994 | ||
995 | static inline | |
996 | struct address_space *page_file_mapping(struct page *page) | |
997 | { | |
998 | if (unlikely(PageSwapCache(page))) | |
999 | return __page_file_mapping(page); | |
1000 | ||
1001 | return page->mapping; | |
1002 | } | |
1003 | ||
1da177e4 LT |
1004 | static inline int PageAnon(struct page *page) |
1005 | { | |
1006 | return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * Return the pagecache index of the passed page. Regular pagecache pages | |
1011 | * use ->index whereas swapcache pages use ->private | |
1012 | */ | |
1013 | static inline pgoff_t page_index(struct page *page) | |
1014 | { | |
1015 | if (unlikely(PageSwapCache(page))) | |
4c21e2f2 | 1016 | return page_private(page); |
1da177e4 LT |
1017 | return page->index; |
1018 | } | |
1019 | ||
f981c595 MG |
1020 | extern pgoff_t __page_file_index(struct page *page); |
1021 | ||
1022 | /* | |
1023 | * Return the file index of the page. Regular pagecache pages use ->index | |
1024 | * whereas swapcache pages use swp_offset(->private) | |
1025 | */ | |
1026 | static inline pgoff_t page_file_index(struct page *page) | |
1027 | { | |
1028 | if (unlikely(PageSwapCache(page))) | |
1029 | return __page_file_index(page); | |
1030 | ||
1031 | return page->index; | |
1032 | } | |
1033 | ||
1da177e4 LT |
1034 | /* |
1035 | * Return true if this page is mapped into pagetables. | |
1036 | */ | |
1037 | static inline int page_mapped(struct page *page) | |
1038 | { | |
1039 | return atomic_read(&(page)->_mapcount) >= 0; | |
1040 | } | |
1041 | ||
1da177e4 LT |
1042 | /* |
1043 | * Different kinds of faults, as returned by handle_mm_fault(). | |
1044 | * Used to decide whether a process gets delivered SIGBUS or | |
1045 | * just gets major/minor fault counters bumped up. | |
1046 | */ | |
d0217ac0 | 1047 | |
83c54070 | 1048 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ |
d0217ac0 | 1049 | |
83c54070 NP |
1050 | #define VM_FAULT_OOM 0x0001 |
1051 | #define VM_FAULT_SIGBUS 0x0002 | |
1052 | #define VM_FAULT_MAJOR 0x0004 | |
1053 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ | |
aa50d3a7 AK |
1054 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ |
1055 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ | |
f33ea7f4 | 1056 | |
83c54070 NP |
1057 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
1058 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ | |
d065bd81 | 1059 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ |
c0292554 | 1060 | #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */ |
1da177e4 | 1061 | |
aa50d3a7 AK |
1062 | #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ |
1063 | ||
1064 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \ | |
c0292554 | 1065 | VM_FAULT_FALLBACK | VM_FAULT_HWPOISON_LARGE) |
aa50d3a7 AK |
1066 | |
1067 | /* Encode hstate index for a hwpoisoned large page */ | |
1068 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12) | |
1069 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) | |
d0217ac0 | 1070 | |
1c0fe6e3 NP |
1071 | /* |
1072 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
1073 | */ | |
1074 | extern void pagefault_out_of_memory(void); | |
1075 | ||
1da177e4 LT |
1076 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
1077 | ||
ddd588b5 | 1078 | /* |
7bf02ea2 | 1079 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
ddd588b5 DR |
1080 | * various contexts. |
1081 | */ | |
4b59e6c4 | 1082 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
ddd588b5 | 1083 | |
7bf02ea2 DR |
1084 | extern void show_free_areas(unsigned int flags); |
1085 | extern bool skip_free_areas_node(unsigned int flags, int nid); | |
1da177e4 | 1086 | |
1da177e4 | 1087 | int shmem_zero_setup(struct vm_area_struct *); |
0cd6144a JW |
1088 | #ifdef CONFIG_SHMEM |
1089 | bool shmem_mapping(struct address_space *mapping); | |
1090 | #else | |
1091 | static inline bool shmem_mapping(struct address_space *mapping) | |
1092 | { | |
1093 | return false; | |
1094 | } | |
1095 | #endif | |
1da177e4 | 1096 | |
e8edc6e0 | 1097 | extern int can_do_mlock(void); |
1da177e4 LT |
1098 | extern int user_shm_lock(size_t, struct user_struct *); |
1099 | extern void user_shm_unlock(size_t, struct user_struct *); | |
1100 | ||
1101 | /* | |
1102 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
1103 | */ | |
1104 | struct zap_details { | |
1105 | struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ | |
1106 | struct address_space *check_mapping; /* Check page->mapping if set */ | |
1107 | pgoff_t first_index; /* Lowest page->index to unmap */ | |
1108 | pgoff_t last_index; /* Highest page->index to unmap */ | |
1da177e4 LT |
1109 | }; |
1110 | ||
7e675137 NP |
1111 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
1112 | pte_t pte); | |
1113 | ||
c627f9cc JS |
1114 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
1115 | unsigned long size); | |
14f5ff5d | 1116 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
1da177e4 | 1117 | unsigned long size, struct zap_details *); |
4f74d2c8 LT |
1118 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
1119 | unsigned long start, unsigned long end); | |
e6473092 MM |
1120 | |
1121 | /** | |
1122 | * mm_walk - callbacks for walk_page_range | |
1123 | * @pgd_entry: if set, called for each non-empty PGD (top-level) entry | |
1124 | * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry | |
1125 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry | |
03319327 DH |
1126 | * this handler is required to be able to handle |
1127 | * pmd_trans_huge() pmds. They may simply choose to | |
1128 | * split_huge_page() instead of handling it explicitly. | |
e6473092 MM |
1129 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
1130 | * @pte_hole: if set, called for each hole at all levels | |
5dc37642 | 1131 | * @hugetlb_entry: if set, called for each hugetlb entry |
c27fe4c8 KM |
1132 | * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry |
1133 | * is used. | |
e6473092 MM |
1134 | * |
1135 | * (see walk_page_range for more details) | |
1136 | */ | |
1137 | struct mm_walk { | |
0f157a5b AM |
1138 | int (*pgd_entry)(pgd_t *pgd, unsigned long addr, |
1139 | unsigned long next, struct mm_walk *walk); | |
1140 | int (*pud_entry)(pud_t *pud, unsigned long addr, | |
1141 | unsigned long next, struct mm_walk *walk); | |
1142 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr, | |
1143 | unsigned long next, struct mm_walk *walk); | |
1144 | int (*pte_entry)(pte_t *pte, unsigned long addr, | |
1145 | unsigned long next, struct mm_walk *walk); | |
1146 | int (*pte_hole)(unsigned long addr, unsigned long next, | |
1147 | struct mm_walk *walk); | |
1148 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, | |
1149 | unsigned long addr, unsigned long next, | |
1150 | struct mm_walk *walk); | |
2165009b DH |
1151 | struct mm_struct *mm; |
1152 | void *private; | |
e6473092 MM |
1153 | }; |
1154 | ||
2165009b DH |
1155 | int walk_page_range(unsigned long addr, unsigned long end, |
1156 | struct mm_walk *walk); | |
42b77728 | 1157 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 1158 | unsigned long end, unsigned long floor, unsigned long ceiling); |
1da177e4 LT |
1159 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
1160 | struct vm_area_struct *vma); | |
1da177e4 LT |
1161 | void unmap_mapping_range(struct address_space *mapping, |
1162 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
3b6748e2 JW |
1163 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
1164 | unsigned long *pfn); | |
d87fe660 | 1165 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
1166 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | |
28b2ee20 RR |
1167 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
1168 | void *buf, int len, int write); | |
1da177e4 LT |
1169 | |
1170 | static inline void unmap_shared_mapping_range(struct address_space *mapping, | |
1171 | loff_t const holebegin, loff_t const holelen) | |
1172 | { | |
1173 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
1174 | } | |
1175 | ||
7caef267 | 1176 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
2c27c65e | 1177 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
623e3db9 | 1178 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
750b4987 | 1179 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
25718736 | 1180 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
83f78668 WF |
1181 | int invalidate_inode_page(struct page *page); |
1182 | ||
7ee1dd3f | 1183 | #ifdef CONFIG_MMU |
83c54070 | 1184 | extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
d06063cc | 1185 | unsigned long address, unsigned int flags); |
5c723ba5 PZ |
1186 | extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, |
1187 | unsigned long address, unsigned int fault_flags); | |
7ee1dd3f DH |
1188 | #else |
1189 | static inline int handle_mm_fault(struct mm_struct *mm, | |
1190 | struct vm_area_struct *vma, unsigned long address, | |
d06063cc | 1191 | unsigned int flags) |
7ee1dd3f DH |
1192 | { |
1193 | /* should never happen if there's no MMU */ | |
1194 | BUG(); | |
1195 | return VM_FAULT_SIGBUS; | |
1196 | } | |
5c723ba5 PZ |
1197 | static inline int fixup_user_fault(struct task_struct *tsk, |
1198 | struct mm_struct *mm, unsigned long address, | |
1199 | unsigned int fault_flags) | |
1200 | { | |
1201 | /* should never happen if there's no MMU */ | |
1202 | BUG(); | |
1203 | return -EFAULT; | |
1204 | } | |
7ee1dd3f | 1205 | #endif |
f33ea7f4 | 1206 | |
1da177e4 | 1207 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); |
5ddd36b9 SW |
1208 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
1209 | void *buf, int len, int write); | |
1da177e4 | 1210 | |
28a35716 ML |
1211 | long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
1212 | unsigned long start, unsigned long nr_pages, | |
1213 | unsigned int foll_flags, struct page **pages, | |
1214 | struct vm_area_struct **vmas, int *nonblocking); | |
1215 | long get_user_pages(struct task_struct *tsk, struct mm_struct *mm, | |
1216 | unsigned long start, unsigned long nr_pages, | |
1217 | int write, int force, struct page **pages, | |
1218 | struct vm_area_struct **vmas); | |
d2bf6be8 NP |
1219 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
1220 | struct page **pages); | |
18022c5d MG |
1221 | struct kvec; |
1222 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, | |
1223 | struct page **pages); | |
1224 | int get_kernel_page(unsigned long start, int write, struct page **pages); | |
f3e8fccd | 1225 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 1226 | |
cf9a2ae8 | 1227 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
d47992f8 LC |
1228 | extern void do_invalidatepage(struct page *page, unsigned int offset, |
1229 | unsigned int length); | |
cf9a2ae8 | 1230 | |
1da177e4 | 1231 | int __set_page_dirty_nobuffers(struct page *page); |
76719325 | 1232 | int __set_page_dirty_no_writeback(struct page *page); |
1da177e4 LT |
1233 | int redirty_page_for_writepage(struct writeback_control *wbc, |
1234 | struct page *page); | |
e3a7cca1 | 1235 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
f629d1c9 | 1236 | void account_page_writeback(struct page *page); |
b3c97528 | 1237 | int set_page_dirty(struct page *page); |
1da177e4 LT |
1238 | int set_page_dirty_lock(struct page *page); |
1239 | int clear_page_dirty_for_io(struct page *page); | |
a9090253 | 1240 | int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
1da177e4 | 1241 | |
39aa3cb3 | 1242 | /* Is the vma a continuation of the stack vma above it? */ |
a09a79f6 | 1243 | static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr) |
39aa3cb3 SB |
1244 | { |
1245 | return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); | |
1246 | } | |
1247 | ||
a09a79f6 MP |
1248 | static inline int stack_guard_page_start(struct vm_area_struct *vma, |
1249 | unsigned long addr) | |
1250 | { | |
1251 | return (vma->vm_flags & VM_GROWSDOWN) && | |
1252 | (vma->vm_start == addr) && | |
1253 | !vma_growsdown(vma->vm_prev, addr); | |
1254 | } | |
1255 | ||
1256 | /* Is the vma a continuation of the stack vma below it? */ | |
1257 | static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr) | |
1258 | { | |
1259 | return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP); | |
1260 | } | |
1261 | ||
1262 | static inline int stack_guard_page_end(struct vm_area_struct *vma, | |
1263 | unsigned long addr) | |
1264 | { | |
1265 | return (vma->vm_flags & VM_GROWSUP) && | |
1266 | (vma->vm_end == addr) && | |
1267 | !vma_growsup(vma->vm_next, addr); | |
1268 | } | |
1269 | ||
58cb6548 ON |
1270 | extern struct task_struct *task_of_stack(struct task_struct *task, |
1271 | struct vm_area_struct *vma, bool in_group); | |
b7643757 | 1272 | |
b6a2fea3 OW |
1273 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
1274 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
38a76013 ML |
1275 | unsigned long new_addr, unsigned long len, |
1276 | bool need_rmap_locks); | |
7da4d641 PZ |
1277 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
1278 | unsigned long end, pgprot_t newprot, | |
4b10e7d5 | 1279 | int dirty_accountable, int prot_numa); |
b6a2fea3 OW |
1280 | extern int mprotect_fixup(struct vm_area_struct *vma, |
1281 | struct vm_area_struct **pprev, unsigned long start, | |
1282 | unsigned long end, unsigned long newflags); | |
1da177e4 | 1283 | |
465a454f PZ |
1284 | /* |
1285 | * doesn't attempt to fault and will return short. | |
1286 | */ | |
1287 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, | |
1288 | struct page **pages); | |
d559db08 KH |
1289 | /* |
1290 | * per-process(per-mm_struct) statistics. | |
1291 | */ | |
d559db08 KH |
1292 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
1293 | { | |
69c97823 KK |
1294 | long val = atomic_long_read(&mm->rss_stat.count[member]); |
1295 | ||
1296 | #ifdef SPLIT_RSS_COUNTING | |
1297 | /* | |
1298 | * counter is updated in asynchronous manner and may go to minus. | |
1299 | * But it's never be expected number for users. | |
1300 | */ | |
1301 | if (val < 0) | |
1302 | val = 0; | |
172703b0 | 1303 | #endif |
69c97823 KK |
1304 | return (unsigned long)val; |
1305 | } | |
d559db08 KH |
1306 | |
1307 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) | |
1308 | { | |
172703b0 | 1309 | atomic_long_add(value, &mm->rss_stat.count[member]); |
d559db08 KH |
1310 | } |
1311 | ||
1312 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
1313 | { | |
172703b0 | 1314 | atomic_long_inc(&mm->rss_stat.count[member]); |
d559db08 KH |
1315 | } |
1316 | ||
1317 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
1318 | { | |
172703b0 | 1319 | atomic_long_dec(&mm->rss_stat.count[member]); |
d559db08 KH |
1320 | } |
1321 | ||
d559db08 KH |
1322 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
1323 | { | |
1324 | return get_mm_counter(mm, MM_FILEPAGES) + | |
1325 | get_mm_counter(mm, MM_ANONPAGES); | |
1326 | } | |
1327 | ||
1328 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
1329 | { | |
1330 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
1331 | } | |
1332 | ||
1333 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
1334 | { | |
1335 | return max(mm->hiwater_vm, mm->total_vm); | |
1336 | } | |
1337 | ||
1338 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
1339 | { | |
1340 | unsigned long _rss = get_mm_rss(mm); | |
1341 | ||
1342 | if ((mm)->hiwater_rss < _rss) | |
1343 | (mm)->hiwater_rss = _rss; | |
1344 | } | |
1345 | ||
1346 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
1347 | { | |
1348 | if (mm->hiwater_vm < mm->total_vm) | |
1349 | mm->hiwater_vm = mm->total_vm; | |
1350 | } | |
1351 | ||
1352 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, | |
1353 | struct mm_struct *mm) | |
1354 | { | |
1355 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
1356 | ||
1357 | if (*maxrss < hiwater_rss) | |
1358 | *maxrss = hiwater_rss; | |
1359 | } | |
1360 | ||
53bddb4e | 1361 | #if defined(SPLIT_RSS_COUNTING) |
05af2e10 | 1362 | void sync_mm_rss(struct mm_struct *mm); |
53bddb4e | 1363 | #else |
05af2e10 | 1364 | static inline void sync_mm_rss(struct mm_struct *mm) |
53bddb4e KH |
1365 | { |
1366 | } | |
1367 | #endif | |
465a454f | 1368 | |
4e950f6f | 1369 | int vma_wants_writenotify(struct vm_area_struct *vma); |
d08b3851 | 1370 | |
25ca1d6c NK |
1371 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
1372 | spinlock_t **ptl); | |
1373 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, | |
1374 | spinlock_t **ptl) | |
1375 | { | |
1376 | pte_t *ptep; | |
1377 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); | |
1378 | return ptep; | |
1379 | } | |
c9cfcddf | 1380 | |
5f22df00 NP |
1381 | #ifdef __PAGETABLE_PUD_FOLDED |
1382 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, | |
1383 | unsigned long address) | |
1384 | { | |
1385 | return 0; | |
1386 | } | |
1387 | #else | |
1bb3630e | 1388 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
5f22df00 NP |
1389 | #endif |
1390 | ||
1391 | #ifdef __PAGETABLE_PMD_FOLDED | |
1392 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, | |
1393 | unsigned long address) | |
1394 | { | |
1395 | return 0; | |
1396 | } | |
1397 | #else | |
1bb3630e | 1398 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
5f22df00 NP |
1399 | #endif |
1400 | ||
8ac1f832 AA |
1401 | int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, |
1402 | pmd_t *pmd, unsigned long address); | |
1bb3630e HD |
1403 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
1404 | ||
1da177e4 LT |
1405 | /* |
1406 | * The following ifdef needed to get the 4level-fixup.h header to work. | |
1407 | * Remove it when 4level-fixup.h has been removed. | |
1408 | */ | |
1bb3630e | 1409 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
1da177e4 LT |
1410 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
1411 | { | |
1bb3630e HD |
1412 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
1413 | NULL: pud_offset(pgd, address); | |
1da177e4 LT |
1414 | } |
1415 | ||
1416 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) | |
1417 | { | |
1bb3630e HD |
1418 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
1419 | NULL: pmd_offset(pud, address); | |
1da177e4 | 1420 | } |
1bb3630e HD |
1421 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
1422 | ||
57c1ffce | 1423 | #if USE_SPLIT_PTE_PTLOCKS |
597d795a | 1424 | #if ALLOC_SPLIT_PTLOCKS |
b35f1819 | 1425 | void __init ptlock_cache_init(void); |
539edb58 PZ |
1426 | extern bool ptlock_alloc(struct page *page); |
1427 | extern void ptlock_free(struct page *page); | |
1428 | ||
1429 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1430 | { | |
1431 | return page->ptl; | |
1432 | } | |
597d795a | 1433 | #else /* ALLOC_SPLIT_PTLOCKS */ |
b35f1819 KS |
1434 | static inline void ptlock_cache_init(void) |
1435 | { | |
1436 | } | |
1437 | ||
49076ec2 KS |
1438 | static inline bool ptlock_alloc(struct page *page) |
1439 | { | |
49076ec2 KS |
1440 | return true; |
1441 | } | |
539edb58 | 1442 | |
49076ec2 KS |
1443 | static inline void ptlock_free(struct page *page) |
1444 | { | |
49076ec2 KS |
1445 | } |
1446 | ||
1447 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1448 | { | |
539edb58 | 1449 | return &page->ptl; |
49076ec2 | 1450 | } |
597d795a | 1451 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
49076ec2 KS |
1452 | |
1453 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) | |
1454 | { | |
1455 | return ptlock_ptr(pmd_page(*pmd)); | |
1456 | } | |
1457 | ||
1458 | static inline bool ptlock_init(struct page *page) | |
1459 | { | |
1460 | /* | |
1461 | * prep_new_page() initialize page->private (and therefore page->ptl) | |
1462 | * with 0. Make sure nobody took it in use in between. | |
1463 | * | |
1464 | * It can happen if arch try to use slab for page table allocation: | |
1465 | * slab code uses page->slab_cache and page->first_page (for tail | |
1466 | * pages), which share storage with page->ptl. | |
1467 | */ | |
309381fe | 1468 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
49076ec2 KS |
1469 | if (!ptlock_alloc(page)) |
1470 | return false; | |
1471 | spin_lock_init(ptlock_ptr(page)); | |
1472 | return true; | |
1473 | } | |
1474 | ||
1475 | /* Reset page->mapping so free_pages_check won't complain. */ | |
1476 | static inline void pte_lock_deinit(struct page *page) | |
1477 | { | |
1478 | page->mapping = NULL; | |
1479 | ptlock_free(page); | |
1480 | } | |
1481 | ||
57c1ffce | 1482 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 HD |
1483 | /* |
1484 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
1485 | */ | |
49076ec2 KS |
1486 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1487 | { | |
1488 | return &mm->page_table_lock; | |
1489 | } | |
b35f1819 | 1490 | static inline void ptlock_cache_init(void) {} |
49076ec2 KS |
1491 | static inline bool ptlock_init(struct page *page) { return true; } |
1492 | static inline void pte_lock_deinit(struct page *page) {} | |
57c1ffce | 1493 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 | 1494 | |
b35f1819 KS |
1495 | static inline void pgtable_init(void) |
1496 | { | |
1497 | ptlock_cache_init(); | |
1498 | pgtable_cache_init(); | |
1499 | } | |
1500 | ||
390f44e2 | 1501 | static inline bool pgtable_page_ctor(struct page *page) |
2f569afd | 1502 | { |
2f569afd | 1503 | inc_zone_page_state(page, NR_PAGETABLE); |
49076ec2 | 1504 | return ptlock_init(page); |
2f569afd MS |
1505 | } |
1506 | ||
1507 | static inline void pgtable_page_dtor(struct page *page) | |
1508 | { | |
1509 | pte_lock_deinit(page); | |
1510 | dec_zone_page_state(page, NR_PAGETABLE); | |
1511 | } | |
1512 | ||
c74df32c HD |
1513 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
1514 | ({ \ | |
4c21e2f2 | 1515 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
c74df32c HD |
1516 | pte_t *__pte = pte_offset_map(pmd, address); \ |
1517 | *(ptlp) = __ptl; \ | |
1518 | spin_lock(__ptl); \ | |
1519 | __pte; \ | |
1520 | }) | |
1521 | ||
1522 | #define pte_unmap_unlock(pte, ptl) do { \ | |
1523 | spin_unlock(ptl); \ | |
1524 | pte_unmap(pte); \ | |
1525 | } while (0) | |
1526 | ||
8ac1f832 AA |
1527 | #define pte_alloc_map(mm, vma, pmd, address) \ |
1528 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \ | |
1529 | pmd, address))? \ | |
1530 | NULL: pte_offset_map(pmd, address)) | |
1bb3630e | 1531 | |
c74df32c | 1532 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
8ac1f832 AA |
1533 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \ |
1534 | pmd, address))? \ | |
c74df32c HD |
1535 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) |
1536 | ||
1bb3630e | 1537 | #define pte_alloc_kernel(pmd, address) \ |
8ac1f832 | 1538 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
1bb3630e | 1539 | NULL: pte_offset_kernel(pmd, address)) |
1da177e4 | 1540 | |
e009bb30 KS |
1541 | #if USE_SPLIT_PMD_PTLOCKS |
1542 | ||
634391ac MS |
1543 | static struct page *pmd_to_page(pmd_t *pmd) |
1544 | { | |
1545 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); | |
1546 | return virt_to_page((void *)((unsigned long) pmd & mask)); | |
1547 | } | |
1548 | ||
e009bb30 KS |
1549 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1550 | { | |
634391ac | 1551 | return ptlock_ptr(pmd_to_page(pmd)); |
e009bb30 KS |
1552 | } |
1553 | ||
1554 | static inline bool pgtable_pmd_page_ctor(struct page *page) | |
1555 | { | |
e009bb30 KS |
1556 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1557 | page->pmd_huge_pte = NULL; | |
1558 | #endif | |
49076ec2 | 1559 | return ptlock_init(page); |
e009bb30 KS |
1560 | } |
1561 | ||
1562 | static inline void pgtable_pmd_page_dtor(struct page *page) | |
1563 | { | |
1564 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 1565 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
e009bb30 | 1566 | #endif |
49076ec2 | 1567 | ptlock_free(page); |
e009bb30 KS |
1568 | } |
1569 | ||
634391ac | 1570 | #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte) |
e009bb30 KS |
1571 | |
1572 | #else | |
1573 | ||
9a86cb7b KS |
1574 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1575 | { | |
1576 | return &mm->page_table_lock; | |
1577 | } | |
1578 | ||
e009bb30 KS |
1579 | static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } |
1580 | static inline void pgtable_pmd_page_dtor(struct page *page) {} | |
1581 | ||
c389a250 | 1582 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
9a86cb7b | 1583 | |
e009bb30 KS |
1584 | #endif |
1585 | ||
9a86cb7b KS |
1586 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
1587 | { | |
1588 | spinlock_t *ptl = pmd_lockptr(mm, pmd); | |
1589 | spin_lock(ptl); | |
1590 | return ptl; | |
1591 | } | |
1592 | ||
1da177e4 | 1593 | extern void free_area_init(unsigned long * zones_size); |
9109fb7b JW |
1594 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
1595 | unsigned long zone_start_pfn, unsigned long *zholes_size); | |
49a7f04a DH |
1596 | extern void free_initmem(void); |
1597 | ||
69afade7 JL |
1598 | /* |
1599 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) | |
1600 | * into the buddy system. The freed pages will be poisoned with pattern | |
dbe67df4 | 1601 | * "poison" if it's within range [0, UCHAR_MAX]. |
69afade7 JL |
1602 | * Return pages freed into the buddy system. |
1603 | */ | |
11199692 | 1604 | extern unsigned long free_reserved_area(void *start, void *end, |
69afade7 | 1605 | int poison, char *s); |
c3d5f5f0 | 1606 | |
cfa11e08 JL |
1607 | #ifdef CONFIG_HIGHMEM |
1608 | /* | |
1609 | * Free a highmem page into the buddy system, adjusting totalhigh_pages | |
1610 | * and totalram_pages. | |
1611 | */ | |
1612 | extern void free_highmem_page(struct page *page); | |
1613 | #endif | |
69afade7 | 1614 | |
c3d5f5f0 | 1615 | extern void adjust_managed_page_count(struct page *page, long count); |
7ee3d4e8 | 1616 | extern void mem_init_print_info(const char *str); |
69afade7 JL |
1617 | |
1618 | /* Free the reserved page into the buddy system, so it gets managed. */ | |
1619 | static inline void __free_reserved_page(struct page *page) | |
1620 | { | |
1621 | ClearPageReserved(page); | |
1622 | init_page_count(page); | |
1623 | __free_page(page); | |
1624 | } | |
1625 | ||
1626 | static inline void free_reserved_page(struct page *page) | |
1627 | { | |
1628 | __free_reserved_page(page); | |
1629 | adjust_managed_page_count(page, 1); | |
1630 | } | |
1631 | ||
1632 | static inline void mark_page_reserved(struct page *page) | |
1633 | { | |
1634 | SetPageReserved(page); | |
1635 | adjust_managed_page_count(page, -1); | |
1636 | } | |
1637 | ||
1638 | /* | |
1639 | * Default method to free all the __init memory into the buddy system. | |
dbe67df4 JL |
1640 | * The freed pages will be poisoned with pattern "poison" if it's within |
1641 | * range [0, UCHAR_MAX]. | |
1642 | * Return pages freed into the buddy system. | |
69afade7 JL |
1643 | */ |
1644 | static inline unsigned long free_initmem_default(int poison) | |
1645 | { | |
1646 | extern char __init_begin[], __init_end[]; | |
1647 | ||
11199692 | 1648 | return free_reserved_area(&__init_begin, &__init_end, |
69afade7 JL |
1649 | poison, "unused kernel"); |
1650 | } | |
1651 | ||
7ee3d4e8 JL |
1652 | static inline unsigned long get_num_physpages(void) |
1653 | { | |
1654 | int nid; | |
1655 | unsigned long phys_pages = 0; | |
1656 | ||
1657 | for_each_online_node(nid) | |
1658 | phys_pages += node_present_pages(nid); | |
1659 | ||
1660 | return phys_pages; | |
1661 | } | |
1662 | ||
0ee332c1 | 1663 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
c713216d | 1664 | /* |
0ee332c1 | 1665 | * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its |
c713216d MG |
1666 | * zones, allocate the backing mem_map and account for memory holes in a more |
1667 | * architecture independent manner. This is a substitute for creating the | |
1668 | * zone_sizes[] and zholes_size[] arrays and passing them to | |
1669 | * free_area_init_node() | |
1670 | * | |
1671 | * An architecture is expected to register range of page frames backed by | |
0ee332c1 | 1672 | * physical memory with memblock_add[_node]() before calling |
c713216d MG |
1673 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
1674 | * usage, an architecture is expected to do something like | |
1675 | * | |
1676 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
1677 | * max_highmem_pfn}; | |
1678 | * for_each_valid_physical_page_range() | |
0ee332c1 | 1679 | * memblock_add_node(base, size, nid) |
c713216d MG |
1680 | * free_area_init_nodes(max_zone_pfns); |
1681 | * | |
0ee332c1 TH |
1682 | * free_bootmem_with_active_regions() calls free_bootmem_node() for each |
1683 | * registered physical page range. Similarly | |
1684 | * sparse_memory_present_with_active_regions() calls memory_present() for | |
1685 | * each range when SPARSEMEM is enabled. | |
c713216d MG |
1686 | * |
1687 | * See mm/page_alloc.c for more information on each function exposed by | |
0ee332c1 | 1688 | * CONFIG_HAVE_MEMBLOCK_NODE_MAP. |
c713216d MG |
1689 | */ |
1690 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); | |
1e01979c | 1691 | unsigned long node_map_pfn_alignment(void); |
32996250 YL |
1692 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
1693 | unsigned long end_pfn); | |
c713216d MG |
1694 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
1695 | unsigned long end_pfn); | |
1696 | extern void get_pfn_range_for_nid(unsigned int nid, | |
1697 | unsigned long *start_pfn, unsigned long *end_pfn); | |
1698 | extern unsigned long find_min_pfn_with_active_regions(void); | |
c713216d MG |
1699 | extern void free_bootmem_with_active_regions(int nid, |
1700 | unsigned long max_low_pfn); | |
1701 | extern void sparse_memory_present_with_active_regions(int nid); | |
f2dbcfa7 | 1702 | |
0ee332c1 | 1703 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
f2dbcfa7 | 1704 | |
0ee332c1 | 1705 | #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ |
f2dbcfa7 KH |
1706 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) |
1707 | static inline int __early_pfn_to_nid(unsigned long pfn) | |
1708 | { | |
1709 | return 0; | |
1710 | } | |
1711 | #else | |
1712 | /* please see mm/page_alloc.c */ | |
1713 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
f2dbcfa7 KH |
1714 | /* there is a per-arch backend function. */ |
1715 | extern int __meminit __early_pfn_to_nid(unsigned long pfn); | |
f2dbcfa7 KH |
1716 | #endif |
1717 | ||
0e0b864e | 1718 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
a2f3aa02 DH |
1719 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
1720 | unsigned long, enum memmap_context); | |
bc75d33f | 1721 | extern void setup_per_zone_wmarks(void); |
1b79acc9 | 1722 | extern int __meminit init_per_zone_wmark_min(void); |
1da177e4 | 1723 | extern void mem_init(void); |
8feae131 | 1724 | extern void __init mmap_init(void); |
b2b755b5 | 1725 | extern void show_mem(unsigned int flags); |
1da177e4 LT |
1726 | extern void si_meminfo(struct sysinfo * val); |
1727 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
1728 | ||
3ee9a4f0 JP |
1729 | extern __printf(3, 4) |
1730 | void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...); | |
a238ab5b | 1731 | |
e7c8d5c9 | 1732 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 1733 | |
112067f0 | 1734 | extern void zone_pcp_update(struct zone *zone); |
340175b7 | 1735 | extern void zone_pcp_reset(struct zone *zone); |
112067f0 | 1736 | |
75f7ad8e PS |
1737 | /* page_alloc.c */ |
1738 | extern int min_free_kbytes; | |
1739 | ||
8feae131 | 1740 | /* nommu.c */ |
33e5d769 | 1741 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 1742 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 1743 | |
6b2dbba8 | 1744 | /* interval_tree.c */ |
6b2dbba8 ML |
1745 | void vma_interval_tree_insert(struct vm_area_struct *node, |
1746 | struct rb_root *root); | |
9826a516 ML |
1747 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
1748 | struct vm_area_struct *prev, | |
1749 | struct rb_root *root); | |
6b2dbba8 ML |
1750 | void vma_interval_tree_remove(struct vm_area_struct *node, |
1751 | struct rb_root *root); | |
1752 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root, | |
1753 | unsigned long start, unsigned long last); | |
1754 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, | |
1755 | unsigned long start, unsigned long last); | |
1756 | ||
1757 | #define vma_interval_tree_foreach(vma, root, start, last) \ | |
1758 | for (vma = vma_interval_tree_iter_first(root, start, last); \ | |
1759 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) | |
1da177e4 LT |
1760 | |
1761 | static inline void vma_nonlinear_insert(struct vm_area_struct *vma, | |
1762 | struct list_head *list) | |
1763 | { | |
6b2dbba8 | 1764 | list_add_tail(&vma->shared.nonlinear, list); |
1da177e4 LT |
1765 | } |
1766 | ||
bf181b9f ML |
1767 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
1768 | struct rb_root *root); | |
1769 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, | |
1770 | struct rb_root *root); | |
1771 | struct anon_vma_chain *anon_vma_interval_tree_iter_first( | |
1772 | struct rb_root *root, unsigned long start, unsigned long last); | |
1773 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( | |
1774 | struct anon_vma_chain *node, unsigned long start, unsigned long last); | |
ed8ea815 ML |
1775 | #ifdef CONFIG_DEBUG_VM_RB |
1776 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); | |
1777 | #endif | |
bf181b9f ML |
1778 | |
1779 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ | |
1780 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ | |
1781 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) | |
1782 | ||
1da177e4 | 1783 | /* mmap.c */ |
34b4e4aa | 1784 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
5beb4930 | 1785 | extern int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
1da177e4 LT |
1786 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
1787 | extern struct vm_area_struct *vma_merge(struct mm_struct *, | |
1788 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, | |
1789 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, | |
1790 | struct mempolicy *); | |
1791 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); | |
1792 | extern int split_vma(struct mm_struct *, | |
1793 | struct vm_area_struct *, unsigned long addr, int new_below); | |
1794 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); | |
1795 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, | |
1796 | struct rb_node **, struct rb_node *); | |
a8fb5618 | 1797 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 | 1798 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
38a76013 ML |
1799 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
1800 | bool *need_rmap_locks); | |
1da177e4 | 1801 | extern void exit_mmap(struct mm_struct *); |
925d1c40 | 1802 | |
9c599024 CG |
1803 | static inline int check_data_rlimit(unsigned long rlim, |
1804 | unsigned long new, | |
1805 | unsigned long start, | |
1806 | unsigned long end_data, | |
1807 | unsigned long start_data) | |
1808 | { | |
1809 | if (rlim < RLIM_INFINITY) { | |
1810 | if (((new - start) + (end_data - start_data)) > rlim) | |
1811 | return -ENOSPC; | |
1812 | } | |
1813 | ||
1814 | return 0; | |
1815 | } | |
1816 | ||
7906d00c AA |
1817 | extern int mm_take_all_locks(struct mm_struct *mm); |
1818 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
1819 | ||
38646013 JS |
1820 | extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
1821 | extern struct file *get_mm_exe_file(struct mm_struct *mm); | |
925d1c40 | 1822 | |
119f657c | 1823 | extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); |
3935ed6a SS |
1824 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
1825 | unsigned long addr, unsigned long len, | |
a62c34bd AL |
1826 | unsigned long flags, |
1827 | const struct vm_special_mapping *spec); | |
1828 | /* This is an obsolete alternative to _install_special_mapping. */ | |
fa5dc22f RM |
1829 | extern int install_special_mapping(struct mm_struct *mm, |
1830 | unsigned long addr, unsigned long len, | |
1831 | unsigned long flags, struct page **pages); | |
1da177e4 LT |
1832 | |
1833 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1834 | ||
0165ab44 | 1835 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
c22c0d63 | 1836 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff); |
bebeb3d6 ML |
1837 | extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, |
1838 | unsigned long len, unsigned long prot, unsigned long flags, | |
41badc15 | 1839 | unsigned long pgoff, unsigned long *populate); |
1da177e4 LT |
1840 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
1841 | ||
bebeb3d6 ML |
1842 | #ifdef CONFIG_MMU |
1843 | extern int __mm_populate(unsigned long addr, unsigned long len, | |
1844 | int ignore_errors); | |
1845 | static inline void mm_populate(unsigned long addr, unsigned long len) | |
1846 | { | |
1847 | /* Ignore errors */ | |
1848 | (void) __mm_populate(addr, len, 1); | |
1849 | } | |
1850 | #else | |
1851 | static inline void mm_populate(unsigned long addr, unsigned long len) {} | |
1852 | #endif | |
1853 | ||
e4eb1ff6 LT |
1854 | /* These take the mm semaphore themselves */ |
1855 | extern unsigned long vm_brk(unsigned long, unsigned long); | |
bfce281c | 1856 | extern int vm_munmap(unsigned long, size_t); |
6be5ceb0 LT |
1857 | extern unsigned long vm_mmap(struct file *, unsigned long, |
1858 | unsigned long, unsigned long, | |
1859 | unsigned long, unsigned long); | |
1da177e4 | 1860 | |
db4fbfb9 ML |
1861 | struct vm_unmapped_area_info { |
1862 | #define VM_UNMAPPED_AREA_TOPDOWN 1 | |
1863 | unsigned long flags; | |
1864 | unsigned long length; | |
1865 | unsigned long low_limit; | |
1866 | unsigned long high_limit; | |
1867 | unsigned long align_mask; | |
1868 | unsigned long align_offset; | |
1869 | }; | |
1870 | ||
1871 | extern unsigned long unmapped_area(struct vm_unmapped_area_info *info); | |
1872 | extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); | |
1873 | ||
1874 | /* | |
1875 | * Search for an unmapped address range. | |
1876 | * | |
1877 | * We are looking for a range that: | |
1878 | * - does not intersect with any VMA; | |
1879 | * - is contained within the [low_limit, high_limit) interval; | |
1880 | * - is at least the desired size. | |
1881 | * - satisfies (begin_addr & align_mask) == (align_offset & align_mask) | |
1882 | */ | |
1883 | static inline unsigned long | |
1884 | vm_unmapped_area(struct vm_unmapped_area_info *info) | |
1885 | { | |
1886 | if (!(info->flags & VM_UNMAPPED_AREA_TOPDOWN)) | |
1887 | return unmapped_area(info); | |
1888 | else | |
1889 | return unmapped_area_topdown(info); | |
1890 | } | |
1891 | ||
85821aab | 1892 | /* truncate.c */ |
1da177e4 | 1893 | extern void truncate_inode_pages(struct address_space *, loff_t); |
d7339071 HR |
1894 | extern void truncate_inode_pages_range(struct address_space *, |
1895 | loff_t lstart, loff_t lend); | |
91b0abe3 | 1896 | extern void truncate_inode_pages_final(struct address_space *); |
1da177e4 LT |
1897 | |
1898 | /* generic vm_area_ops exported for stackable file systems */ | |
d0217ac0 | 1899 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
f1820361 | 1900 | extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf); |
4fcf1c62 | 1901 | extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
1da177e4 LT |
1902 | |
1903 | /* mm/page-writeback.c */ | |
1904 | int write_one_page(struct page *page, int wait); | |
1cf6e7d8 | 1905 | void task_dirty_inc(struct task_struct *tsk); |
1da177e4 LT |
1906 | |
1907 | /* readahead.c */ | |
1908 | #define VM_MAX_READAHEAD 128 /* kbytes */ | |
1909 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ | |
1da177e4 | 1910 | |
1da177e4 | 1911 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
7361f4d8 | 1912 | pgoff_t offset, unsigned long nr_to_read); |
cf914a7d RR |
1913 | |
1914 | void page_cache_sync_readahead(struct address_space *mapping, | |
1915 | struct file_ra_state *ra, | |
1916 | struct file *filp, | |
1917 | pgoff_t offset, | |
1918 | unsigned long size); | |
1919 | ||
1920 | void page_cache_async_readahead(struct address_space *mapping, | |
1921 | struct file_ra_state *ra, | |
1922 | struct file *filp, | |
1923 | struct page *pg, | |
1924 | pgoff_t offset, | |
1925 | unsigned long size); | |
1926 | ||
1da177e4 LT |
1927 | unsigned long max_sane_readahead(unsigned long nr); |
1928 | ||
d05f3169 | 1929 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
46dea3d0 | 1930 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
d05f3169 MH |
1931 | |
1932 | /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */ | |
1933 | extern int expand_downwards(struct vm_area_struct *vma, | |
1934 | unsigned long address); | |
8ca3eb08 | 1935 | #if VM_GROWSUP |
46dea3d0 | 1936 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 TL |
1937 | #else |
1938 | #define expand_upwards(vma, address) do { } while (0) | |
9ab88515 | 1939 | #endif |
1da177e4 LT |
1940 | |
1941 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
1942 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
1943 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
1944 | struct vm_area_struct **pprev); | |
1945 | ||
1946 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, | |
1947 | NULL if none. Assume start_addr < end_addr. */ | |
1948 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) | |
1949 | { | |
1950 | struct vm_area_struct * vma = find_vma(mm,start_addr); | |
1951 | ||
1952 | if (vma && end_addr <= vma->vm_start) | |
1953 | vma = NULL; | |
1954 | return vma; | |
1955 | } | |
1956 | ||
1957 | static inline unsigned long vma_pages(struct vm_area_struct *vma) | |
1958 | { | |
1959 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
1960 | } | |
1961 | ||
640708a2 PE |
1962 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
1963 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, | |
1964 | unsigned long vm_start, unsigned long vm_end) | |
1965 | { | |
1966 | struct vm_area_struct *vma = find_vma(mm, vm_start); | |
1967 | ||
1968 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) | |
1969 | vma = NULL; | |
1970 | ||
1971 | return vma; | |
1972 | } | |
1973 | ||
bad849b3 | 1974 | #ifdef CONFIG_MMU |
804af2cf | 1975 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
bad849b3 DH |
1976 | #else |
1977 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
1978 | { | |
1979 | return __pgprot(0); | |
1980 | } | |
1981 | #endif | |
1982 | ||
5877231f | 1983 | #ifdef CONFIG_NUMA_BALANCING |
4b10e7d5 | 1984 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
b24f53a0 LS |
1985 | unsigned long start, unsigned long end); |
1986 | #endif | |
1987 | ||
deceb6cd | 1988 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
deceb6cd HD |
1989 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
1990 | unsigned long pfn, unsigned long size, pgprot_t); | |
a145dd41 | 1991 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
e0dc0d8f NP |
1992 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
1993 | unsigned long pfn); | |
423bad60 NP |
1994 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
1995 | unsigned long pfn); | |
b4cbb197 LT |
1996 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
1997 | ||
deceb6cd | 1998 | |
240aadee ML |
1999 | struct page *follow_page_mask(struct vm_area_struct *vma, |
2000 | unsigned long address, unsigned int foll_flags, | |
2001 | unsigned int *page_mask); | |
2002 | ||
2003 | static inline struct page *follow_page(struct vm_area_struct *vma, | |
2004 | unsigned long address, unsigned int foll_flags) | |
2005 | { | |
2006 | unsigned int unused_page_mask; | |
2007 | return follow_page_mask(vma, address, foll_flags, &unused_page_mask); | |
2008 | } | |
2009 | ||
deceb6cd HD |
2010 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
2011 | #define FOLL_TOUCH 0x02 /* mark page accessed */ | |
2012 | #define FOLL_GET 0x04 /* do get_page on page */ | |
8e4b9a60 | 2013 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
58fa879e | 2014 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
318b275f GN |
2015 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
2016 | * and return without waiting upon it */ | |
110d74a9 | 2017 | #define FOLL_MLOCK 0x40 /* mark page as mlocked */ |
500d65d4 | 2018 | #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ |
69ebb83e | 2019 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
0b9d7052 | 2020 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
5117b3b8 | 2021 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
234b239b | 2022 | #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ |
1da177e4 | 2023 | |
2f569afd | 2024 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
aee16b3c JF |
2025 | void *data); |
2026 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, | |
2027 | unsigned long size, pte_fn_t fn, void *data); | |
2028 | ||
1da177e4 | 2029 | #ifdef CONFIG_PROC_FS |
ab50b8ed | 2030 | void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); |
1da177e4 | 2031 | #else |
ab50b8ed | 2032 | static inline void vm_stat_account(struct mm_struct *mm, |
1da177e4 LT |
2033 | unsigned long flags, struct file *file, long pages) |
2034 | { | |
44de9d0c | 2035 | mm->total_vm += pages; |
1da177e4 LT |
2036 | } |
2037 | #endif /* CONFIG_PROC_FS */ | |
2038 | ||
12d6f21e | 2039 | #ifdef CONFIG_DEBUG_PAGEALLOC |
12d6f21e | 2040 | extern void kernel_map_pages(struct page *page, int numpages, int enable); |
8a235efa RW |
2041 | #ifdef CONFIG_HIBERNATION |
2042 | extern bool kernel_page_present(struct page *page); | |
2043 | #endif /* CONFIG_HIBERNATION */ | |
12d6f21e | 2044 | #else |
1da177e4 | 2045 | static inline void |
9858db50 | 2046 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
8a235efa RW |
2047 | #ifdef CONFIG_HIBERNATION |
2048 | static inline bool kernel_page_present(struct page *page) { return true; } | |
2049 | #endif /* CONFIG_HIBERNATION */ | |
1da177e4 LT |
2050 | #endif |
2051 | ||
a6c19dfe | 2052 | #ifdef __HAVE_ARCH_GATE_AREA |
31db58b3 | 2053 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
a6c19dfe AL |
2054 | extern int in_gate_area_no_mm(unsigned long addr); |
2055 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr); | |
1da177e4 | 2056 | #else |
a6c19dfe AL |
2057 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
2058 | { | |
2059 | return NULL; | |
2060 | } | |
2061 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } | |
2062 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
2063 | { | |
2064 | return 0; | |
2065 | } | |
1da177e4 LT |
2066 | #endif /* __HAVE_ARCH_GATE_AREA */ |
2067 | ||
146732ce JT |
2068 | #ifdef CONFIG_SYSCTL |
2069 | extern int sysctl_drop_caches; | |
8d65af78 | 2070 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
9d0243bc | 2071 | void __user *, size_t *, loff_t *); |
146732ce JT |
2072 | #endif |
2073 | ||
a09ed5e0 | 2074 | unsigned long shrink_slab(struct shrink_control *shrink, |
1495f230 YH |
2075 | unsigned long nr_pages_scanned, |
2076 | unsigned long lru_pages); | |
9d0243bc | 2077 | |
7a9166e3 LY |
2078 | #ifndef CONFIG_MMU |
2079 | #define randomize_va_space 0 | |
2080 | #else | |
a62eaf15 | 2081 | extern int randomize_va_space; |
7a9166e3 | 2082 | #endif |
a62eaf15 | 2083 | |
045e72ac | 2084 | const char * arch_vma_name(struct vm_area_struct *vma); |
03252919 | 2085 | void print_vma_addr(char *prefix, unsigned long rip); |
e6e5494c | 2086 | |
9bdac914 YL |
2087 | void sparse_mem_maps_populate_node(struct page **map_map, |
2088 | unsigned long pnum_begin, | |
2089 | unsigned long pnum_end, | |
2090 | unsigned long map_count, | |
2091 | int nodeid); | |
2092 | ||
98f3cfc1 | 2093 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
29c71111 AW |
2094 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
2095 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); | |
2096 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); | |
2097 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); | |
8f6aac41 | 2098 | void *vmemmap_alloc_block(unsigned long size, int node); |
9bdac914 | 2099 | void *vmemmap_alloc_block_buf(unsigned long size, int node); |
8f6aac41 | 2100 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
0aad818b JW |
2101 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
2102 | int node); | |
2103 | int vmemmap_populate(unsigned long start, unsigned long end, int node); | |
c2b91e2e | 2104 | void vmemmap_populate_print_last(void); |
0197518c | 2105 | #ifdef CONFIG_MEMORY_HOTPLUG |
0aad818b | 2106 | void vmemmap_free(unsigned long start, unsigned long end); |
0197518c | 2107 | #endif |
46723bfa YI |
2108 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
2109 | unsigned long size); | |
6a46079c | 2110 | |
82ba011b AK |
2111 | enum mf_flags { |
2112 | MF_COUNT_INCREASED = 1 << 0, | |
7329bbeb | 2113 | MF_ACTION_REQUIRED = 1 << 1, |
6751ed65 | 2114 | MF_MUST_KILL = 1 << 2, |
cf870c70 | 2115 | MF_SOFT_OFFLINE = 1 << 3, |
82ba011b | 2116 | }; |
cd42f4a3 | 2117 | extern int memory_failure(unsigned long pfn, int trapno, int flags); |
ea8f5fb8 | 2118 | extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); |
847ce401 | 2119 | extern int unpoison_memory(unsigned long pfn); |
6a46079c AK |
2120 | extern int sysctl_memory_failure_early_kill; |
2121 | extern int sysctl_memory_failure_recovery; | |
facb6011 | 2122 | extern void shake_page(struct page *p, int access); |
293c07e3 | 2123 | extern atomic_long_t num_poisoned_pages; |
facb6011 | 2124 | extern int soft_offline_page(struct page *page, int flags); |
6a46079c | 2125 | |
47ad8475 AA |
2126 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
2127 | extern void clear_huge_page(struct page *page, | |
2128 | unsigned long addr, | |
2129 | unsigned int pages_per_huge_page); | |
2130 | extern void copy_user_huge_page(struct page *dst, struct page *src, | |
2131 | unsigned long addr, struct vm_area_struct *vma, | |
2132 | unsigned int pages_per_huge_page); | |
2133 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ | |
2134 | ||
c0a32fc5 SG |
2135 | #ifdef CONFIG_DEBUG_PAGEALLOC |
2136 | extern unsigned int _debug_guardpage_minorder; | |
2137 | ||
2138 | static inline unsigned int debug_guardpage_minorder(void) | |
2139 | { | |
2140 | return _debug_guardpage_minorder; | |
2141 | } | |
2142 | ||
2143 | static inline bool page_is_guard(struct page *page) | |
2144 | { | |
2145 | return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags); | |
2146 | } | |
2147 | #else | |
2148 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } | |
2149 | static inline bool page_is_guard(struct page *page) { return false; } | |
2150 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
2151 | ||
f9872caf CS |
2152 | #if MAX_NUMNODES > 1 |
2153 | void __init setup_nr_node_ids(void); | |
2154 | #else | |
2155 | static inline void setup_nr_node_ids(void) {} | |
2156 | #endif | |
2157 | ||
1da177e4 LT |
2158 | #endif /* __KERNEL__ */ |
2159 | #endif /* _LINUX_MM_H */ |