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1 | #ifndef _LINUX_MM_H |
2 | #define _LINUX_MM_H |
3 | |
4 | #include <linux/errno.h> |
5 | |
6 | #ifdef __KERNEL__ |
7 | |
8 | #include <linux/gfp.h> |
9 | #include <linux/bug.h> |
10 | #include <linux/list.h> |
11 | #include <linux/mmzone.h> |
12 | #include <linux/rbtree.h> |
13 | #include <linux/atomic.h> |
14 | #include <linux/debug_locks.h> |
15 | #include <linux/mm_types.h> |
16 | #include <linux/range.h> |
17 | #include <linux/pfn.h> |
18 | #include <linux/bit_spinlock.h> |
19 | #include <linux/shrinker.h> |
20 | |
21 | struct mempolicy; |
22 | struct anon_vma; |
23 | struct anon_vma_chain; |
24 | struct file_ra_state; |
25 | struct user_struct; |
26 | struct writeback_control; |
27 | |
28 | #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */ |
29 | extern unsigned long max_mapnr; |
30 | |
31 | static inline void set_max_mapnr(unsigned long limit) |
32 | { |
33 | max_mapnr = limit; |
34 | } |
35 | #else |
36 | static inline void set_max_mapnr(unsigned long limit) { } |
37 | #endif |
38 | |
39 | extern unsigned long totalram_pages; |
40 | extern void * high_memory; |
41 | extern int page_cluster; |
42 | |
43 | #ifdef CONFIG_SYSCTL |
44 | extern int sysctl_legacy_va_layout; |
45 | #else |
46 | #define sysctl_legacy_va_layout 0 |
47 | #endif |
48 | |
49 | #include <asm/page.h> |
50 | #include <asm/pgtable.h> |
51 | #include <asm/processor.h> |
52 | |
53 | #ifndef __pa_symbol |
54 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) |
55 | #endif |
56 | |
57 | extern unsigned long sysctl_user_reserve_kbytes; |
58 | extern unsigned long sysctl_admin_reserve_kbytes; |
59 | |
60 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
61 | |
62 | /* to align the pointer to the (next) page boundary */ |
63 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) |
64 | |
65 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
66 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE) |
67 | |
68 | /* |
69 | * Linux kernel virtual memory manager primitives. |
70 | * The idea being to have a "virtual" mm in the same way |
71 | * we have a virtual fs - giving a cleaner interface to the |
72 | * mm details, and allowing different kinds of memory mappings |
73 | * (from shared memory to executable loading to arbitrary |
74 | * mmap() functions). |
75 | */ |
76 | |
77 | extern struct kmem_cache *vm_area_cachep; |
78 | |
79 | #ifndef CONFIG_MMU |
80 | extern struct rb_root nommu_region_tree; |
81 | extern struct rw_semaphore nommu_region_sem; |
82 | |
83 | extern unsigned int kobjsize(const void *objp); |
84 | #endif |
85 | |
86 | /* |
87 | * vm_flags in vm_area_struct, see mm_types.h. |
88 | */ |
89 | #define VM_NONE 0x00000000 |
90 | |
91 | #define VM_READ 0x00000001 /* currently active flags */ |
92 | #define VM_WRITE 0x00000002 |
93 | #define VM_EXEC 0x00000004 |
94 | #define VM_SHARED 0x00000008 |
95 | |
96 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
97 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
98 | #define VM_MAYWRITE 0x00000020 |
99 | #define VM_MAYEXEC 0x00000040 |
100 | #define VM_MAYSHARE 0x00000080 |
101 | |
102 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ |
103 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
104 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
105 | |
106 | #define VM_LOCKED 0x00002000 |
107 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ |
108 | |
109 | /* Used by sys_madvise() */ |
110 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ |
111 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ |
112 | |
113 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ |
114 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ |
115 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
116 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
117 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
118 | #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */ |
119 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
120 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
121 | |
122 | #ifdef CONFIG_MEM_SOFT_DIRTY |
123 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ |
124 | #else |
125 | # define VM_SOFTDIRTY 0 |
126 | #endif |
127 | |
128 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
129 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
130 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ |
131 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
132 | |
133 | #if defined(CONFIG_X86) |
134 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ |
135 | #elif defined(CONFIG_PPC) |
136 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ |
137 | #elif defined(CONFIG_PARISC) |
138 | # define VM_GROWSUP VM_ARCH_1 |
139 | #elif defined(CONFIG_METAG) |
140 | # define VM_GROWSUP VM_ARCH_1 |
141 | #elif defined(CONFIG_IA64) |
142 | # define VM_GROWSUP VM_ARCH_1 |
143 | #elif !defined(CONFIG_MMU) |
144 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ |
145 | #endif |
146 | |
147 | #ifndef VM_GROWSUP |
148 | # define VM_GROWSUP VM_NONE |
149 | #endif |
150 | |
151 | /* Bits set in the VMA until the stack is in its final location */ |
152 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) |
153 | |
154 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
155 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS |
156 | #endif |
157 | |
158 | #ifdef CONFIG_STACK_GROWSUP |
159 | #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
160 | #else |
161 | #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
162 | #endif |
163 | |
164 | /* |
165 | * Special vmas that are non-mergable, non-mlock()able. |
166 | * Note: mm/huge_memory.c VM_NO_THP depends on this definition. |
167 | */ |
168 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP) |
169 | |
170 | /* |
171 | * mapping from the currently active vm_flags protection bits (the |
172 | * low four bits) to a page protection mask.. |
173 | */ |
174 | extern pgprot_t protection_map[16]; |
175 | |
176 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
177 | #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ |
178 | #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */ |
179 | #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */ |
180 | #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */ |
181 | #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */ |
182 | #define FAULT_FLAG_TRIED 0x40 /* second try */ |
183 | #define FAULT_FLAG_USER 0x80 /* The fault originated in userspace */ |
184 | |
185 | /* |
186 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
187 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
188 | * of VM_FAULT_xxx flags that give details about how the fault was handled. |
189 | * |
190 | * pgoff should be used in favour of virtual_address, if possible. If pgoff |
191 | * is used, one may implement ->remap_pages to get nonlinear mapping support. |
192 | */ |
193 | struct vm_fault { |
194 | unsigned int flags; /* FAULT_FLAG_xxx flags */ |
195 | pgoff_t pgoff; /* Logical page offset based on vma */ |
196 | void __user *virtual_address; /* Faulting virtual address */ |
197 | |
198 | struct page *page; /* ->fault handlers should return a |
199 | * page here, unless VM_FAULT_NOPAGE |
200 | * is set (which is also implied by |
201 | * VM_FAULT_ERROR). |
202 | */ |
203 | }; |
204 | |
205 | /* |
206 | * These are the virtual MM functions - opening of an area, closing and |
207 | * unmapping it (needed to keep files on disk up-to-date etc), pointer |
208 | * to the functions called when a no-page or a wp-page exception occurs. |
209 | */ |
210 | struct vm_operations_struct { |
211 | void (*open)(struct vm_area_struct * area); |
212 | void (*close)(struct vm_area_struct * area); |
213 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
214 | |
215 | /* notification that a previously read-only page is about to become |
216 | * writable, if an error is returned it will cause a SIGBUS */ |
217 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
218 | |
219 | /* called by access_process_vm when get_user_pages() fails, typically |
220 | * for use by special VMAs that can switch between memory and hardware |
221 | */ |
222 | int (*access)(struct vm_area_struct *vma, unsigned long addr, |
223 | void *buf, int len, int write); |
224 | #ifdef CONFIG_NUMA |
225 | /* |
226 | * set_policy() op must add a reference to any non-NULL @new mempolicy |
227 | * to hold the policy upon return. Caller should pass NULL @new to |
228 | * remove a policy and fall back to surrounding context--i.e. do not |
229 | * install a MPOL_DEFAULT policy, nor the task or system default |
230 | * mempolicy. |
231 | */ |
232 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
233 | |
234 | /* |
235 | * get_policy() op must add reference [mpol_get()] to any policy at |
236 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure |
237 | * in mm/mempolicy.c will do this automatically. |
238 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not |
239 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. |
240 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
241 | * must return NULL--i.e., do not "fallback" to task or system default |
242 | * policy. |
243 | */ |
244 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
245 | unsigned long addr); |
246 | int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, |
247 | const nodemask_t *to, unsigned long flags); |
248 | #endif |
249 | /* called by sys_remap_file_pages() to populate non-linear mapping */ |
250 | int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr, |
251 | unsigned long size, pgoff_t pgoff); |
252 | }; |
253 | |
254 | struct mmu_gather; |
255 | struct inode; |
256 | |
257 | #define page_private(page) ((page)->private) |
258 | #define set_page_private(page, v) ((page)->private = (v)) |
259 | |
260 | /* It's valid only if the page is free path or free_list */ |
261 | static inline void set_freepage_migratetype(struct page *page, int migratetype) |
262 | { |
263 | page->index = migratetype; |
264 | } |
265 | |
266 | /* It's valid only if the page is free path or free_list */ |
267 | static inline int get_freepage_migratetype(struct page *page) |
268 | { |
269 | return page->index; |
270 | } |
271 | |
272 | /* |
273 | * FIXME: take this include out, include page-flags.h in |
274 | * files which need it (119 of them) |
275 | */ |
276 | #include <linux/page-flags.h> |
277 | #include <linux/huge_mm.h> |
278 | |
279 | /* |
280 | * Methods to modify the page usage count. |
281 | * |
282 | * What counts for a page usage: |
283 | * - cache mapping (page->mapping) |
284 | * - private data (page->private) |
285 | * - page mapped in a task's page tables, each mapping |
286 | * is counted separately |
287 | * |
288 | * Also, many kernel routines increase the page count before a critical |
289 | * routine so they can be sure the page doesn't go away from under them. |
290 | */ |
291 | |
292 | /* |
293 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
294 | */ |
295 | static inline int put_page_testzero(struct page *page) |
296 | { |
297 | VM_BUG_ON(atomic_read(&page->_count) == 0); |
298 | return atomic_dec_and_test(&page->_count); |
299 | } |
300 | |
301 | /* |
302 | * Try to grab a ref unless the page has a refcount of zero, return false if |
303 | * that is the case. |
304 | * This can be called when MMU is off so it must not access |
305 | * any of the virtual mappings. |
306 | */ |
307 | static inline int get_page_unless_zero(struct page *page) |
308 | { |
309 | return atomic_inc_not_zero(&page->_count); |
310 | } |
311 | |
312 | /* |
313 | * Try to drop a ref unless the page has a refcount of one, return false if |
314 | * that is the case. |
315 | * This is to make sure that the refcount won't become zero after this drop. |
316 | * This can be called when MMU is off so it must not access |
317 | * any of the virtual mappings. |
318 | */ |
319 | static inline int put_page_unless_one(struct page *page) |
320 | { |
321 | return atomic_add_unless(&page->_count, -1, 1); |
322 | } |
323 | |
324 | extern int page_is_ram(unsigned long pfn); |
325 | |
326 | /* Support for virtually mapped pages */ |
327 | struct page *vmalloc_to_page(const void *addr); |
328 | unsigned long vmalloc_to_pfn(const void *addr); |
329 | |
330 | /* |
331 | * Determine if an address is within the vmalloc range |
332 | * |
333 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there |
334 | * is no special casing required. |
335 | */ |
336 | static inline int is_vmalloc_addr(const void *x) |
337 | { |
338 | #ifdef CONFIG_MMU |
339 | unsigned long addr = (unsigned long)x; |
340 | |
341 | return addr >= VMALLOC_START && addr < VMALLOC_END; |
342 | #else |
343 | return 0; |
344 | #endif |
345 | } |
346 | #ifdef CONFIG_MMU |
347 | extern int is_vmalloc_or_module_addr(const void *x); |
348 | #else |
349 | static inline int is_vmalloc_or_module_addr(const void *x) |
350 | { |
351 | return 0; |
352 | } |
353 | #endif |
354 | |
355 | static inline void compound_lock(struct page *page) |
356 | { |
357 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
358 | VM_BUG_ON(PageSlab(page)); |
359 | bit_spin_lock(PG_compound_lock, &page->flags); |
360 | #endif |
361 | } |
362 | |
363 | static inline void compound_unlock(struct page *page) |
364 | { |
365 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
366 | VM_BUG_ON(PageSlab(page)); |
367 | bit_spin_unlock(PG_compound_lock, &page->flags); |
368 | #endif |
369 | } |
370 | |
371 | static inline unsigned long compound_lock_irqsave(struct page *page) |
372 | { |
373 | unsigned long uninitialized_var(flags); |
374 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
375 | local_irq_save(flags); |
376 | compound_lock(page); |
377 | #endif |
378 | return flags; |
379 | } |
380 | |
381 | static inline void compound_unlock_irqrestore(struct page *page, |
382 | unsigned long flags) |
383 | { |
384 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
385 | compound_unlock(page); |
386 | local_irq_restore(flags); |
387 | #endif |
388 | } |
389 | |
390 | static inline struct page *compound_head(struct page *page) |
391 | { |
392 | if (unlikely(PageTail(page))) |
393 | return page->first_page; |
394 | return page; |
395 | } |
396 | |
397 | /* |
398 | * The atomic page->_mapcount, starts from -1: so that transitions |
399 | * both from it and to it can be tracked, using atomic_inc_and_test |
400 | * and atomic_add_negative(-1). |
401 | */ |
402 | static inline void page_mapcount_reset(struct page *page) |
403 | { |
404 | atomic_set(&(page)->_mapcount, -1); |
405 | } |
406 | |
407 | static inline int page_mapcount(struct page *page) |
408 | { |
409 | return atomic_read(&(page)->_mapcount) + 1; |
410 | } |
411 | |
412 | static inline int page_count(struct page *page) |
413 | { |
414 | return atomic_read(&compound_head(page)->_count); |
415 | } |
416 | |
417 | static inline void get_huge_page_tail(struct page *page) |
418 | { |
419 | /* |
420 | * __split_huge_page_refcount() cannot run |
421 | * from under us. |
422 | */ |
423 | VM_BUG_ON(page_mapcount(page) < 0); |
424 | VM_BUG_ON(atomic_read(&page->_count) != 0); |
425 | atomic_inc(&page->_mapcount); |
426 | } |
427 | |
428 | extern bool __get_page_tail(struct page *page); |
429 | |
430 | static inline void get_page(struct page *page) |
431 | { |
432 | if (unlikely(PageTail(page))) |
433 | if (likely(__get_page_tail(page))) |
434 | return; |
435 | /* |
436 | * Getting a normal page or the head of a compound page |
437 | * requires to already have an elevated page->_count. |
438 | */ |
439 | VM_BUG_ON(atomic_read(&page->_count) <= 0); |
440 | atomic_inc(&page->_count); |
441 | } |
442 | |
443 | static inline struct page *virt_to_head_page(const void *x) |
444 | { |
445 | struct page *page = virt_to_page(x); |
446 | return compound_head(page); |
447 | } |
448 | |
449 | /* |
450 | * Setup the page count before being freed into the page allocator for |
451 | * the first time (boot or memory hotplug) |
452 | */ |
453 | static inline void init_page_count(struct page *page) |
454 | { |
455 | atomic_set(&page->_count, 1); |
456 | } |
457 | |
458 | /* |
459 | * PageBuddy() indicate that the page is free and in the buddy system |
460 | * (see mm/page_alloc.c). |
461 | * |
462 | * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to |
463 | * -2 so that an underflow of the page_mapcount() won't be mistaken |
464 | * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very |
465 | * efficiently by most CPU architectures. |
466 | */ |
467 | #define PAGE_BUDDY_MAPCOUNT_VALUE (-128) |
468 | |
469 | static inline int PageBuddy(struct page *page) |
470 | { |
471 | return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE; |
472 | } |
473 | |
474 | static inline void __SetPageBuddy(struct page *page) |
475 | { |
476 | VM_BUG_ON(atomic_read(&page->_mapcount) != -1); |
477 | atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE); |
478 | } |
479 | |
480 | static inline void __ClearPageBuddy(struct page *page) |
481 | { |
482 | VM_BUG_ON(!PageBuddy(page)); |
483 | atomic_set(&page->_mapcount, -1); |
484 | } |
485 | |
486 | void put_page(struct page *page); |
487 | void put_pages_list(struct list_head *pages); |
488 | |
489 | void split_page(struct page *page, unsigned int order); |
490 | int split_free_page(struct page *page); |
491 | |
492 | /* |
493 | * Compound pages have a destructor function. Provide a |
494 | * prototype for that function and accessor functions. |
495 | * These are _only_ valid on the head of a PG_compound page. |
496 | */ |
497 | typedef void compound_page_dtor(struct page *); |
498 | |
499 | static inline void set_compound_page_dtor(struct page *page, |
500 | compound_page_dtor *dtor) |
501 | { |
502 | page[1].lru.next = (void *)dtor; |
503 | } |
504 | |
505 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) |
506 | { |
507 | return (compound_page_dtor *)page[1].lru.next; |
508 | } |
509 | |
510 | static inline int compound_order(struct page *page) |
511 | { |
512 | if (!PageHead(page)) |
513 | return 0; |
514 | return (unsigned long)page[1].lru.prev; |
515 | } |
516 | |
517 | static inline void set_compound_order(struct page *page, unsigned long order) |
518 | { |
519 | page[1].lru.prev = (void *)order; |
520 | } |
521 | |
522 | #ifdef CONFIG_MMU |
523 | /* |
524 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when |
525 | * servicing faults for write access. In the normal case, do always want |
526 | * pte_mkwrite. But get_user_pages can cause write faults for mappings |
527 | * that do not have writing enabled, when used by access_process_vm. |
528 | */ |
529 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) |
530 | { |
531 | if (likely(vma->vm_flags & VM_WRITE)) |
532 | pte = pte_mkwrite(pte); |
533 | return pte; |
534 | } |
535 | #endif |
536 | |
537 | /* |
538 | * Multiple processes may "see" the same page. E.g. for untouched |
539 | * mappings of /dev/null, all processes see the same page full of |
540 | * zeroes, and text pages of executables and shared libraries have |
541 | * only one copy in memory, at most, normally. |
542 | * |
543 | * For the non-reserved pages, page_count(page) denotes a reference count. |
544 | * page_count() == 0 means the page is free. page->lru is then used for |
545 | * freelist management in the buddy allocator. |
546 | * page_count() > 0 means the page has been allocated. |
547 | * |
548 | * Pages are allocated by the slab allocator in order to provide memory |
549 | * to kmalloc and kmem_cache_alloc. In this case, the management of the |
550 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c |
551 | * unless a particular usage is carefully commented. (the responsibility of |
552 | * freeing the kmalloc memory is the caller's, of course). |
553 | * |
554 | * A page may be used by anyone else who does a __get_free_page(). |
555 | * In this case, page_count still tracks the references, and should only |
556 | * be used through the normal accessor functions. The top bits of page->flags |
557 | * and page->virtual store page management information, but all other fields |
558 | * are unused and could be used privately, carefully. The management of this |
559 | * page is the responsibility of the one who allocated it, and those who have |
560 | * subsequently been given references to it. |
561 | * |
562 | * The other pages (we may call them "pagecache pages") are completely |
563 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
564 | * The following discussion applies only to them. |
565 | * |
566 | * A pagecache page contains an opaque `private' member, which belongs to the |
567 | * page's address_space. Usually, this is the address of a circular list of |
568 | * the page's disk buffers. PG_private must be set to tell the VM to call |
569 | * into the filesystem to release these pages. |
570 | * |
571 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
572 | * is the pointer to the inode, and page->index is the file offset of the page, |
573 | * in units of PAGE_CACHE_SIZE. |
574 | * |
575 | * If pagecache pages are not associated with an inode, they are said to be |
576 | * anonymous pages. These may become associated with the swapcache, and in that |
577 | * case PG_swapcache is set, and page->private is an offset into the swapcache. |
578 | * |
579 | * In either case (swapcache or inode backed), the pagecache itself holds one |
580 | * reference to the page. Setting PG_private should also increment the |
581 | * refcount. The each user mapping also has a reference to the page. |
582 | * |
583 | * The pagecache pages are stored in a per-mapping radix tree, which is |
584 | * rooted at mapping->page_tree, and indexed by offset. |
585 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space |
586 | * lists, we instead now tag pages as dirty/writeback in the radix tree. |
587 | * |
588 | * All pagecache pages may be subject to I/O: |
589 | * - inode pages may need to be read from disk, |
590 | * - inode pages which have been modified and are MAP_SHARED may need |
591 | * to be written back to the inode on disk, |
592 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been |
593 | * modified may need to be swapped out to swap space and (later) to be read |
594 | * back into memory. |
595 | */ |
596 | |
597 | /* |
598 | * The zone field is never updated after free_area_init_core() |
599 | * sets it, so none of the operations on it need to be atomic. |
600 | */ |
601 | |
602 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
603 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
604 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
605 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) |
606 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
607 | |
608 | /* |
609 | * Define the bit shifts to access each section. For non-existent |
610 | * sections we define the shift as 0; that plus a 0 mask ensures |
611 | * the compiler will optimise away reference to them. |
612 | */ |
613 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
614 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) |
615 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) |
616 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
617 | |
618 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
619 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
620 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
621 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
622 | SECTIONS_PGOFF : ZONES_PGOFF) |
623 | #else |
624 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
625 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
626 | NODES_PGOFF : ZONES_PGOFF) |
627 | #endif |
628 | |
629 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
630 | |
631 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
632 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
633 | #endif |
634 | |
635 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
636 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) |
637 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) |
638 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_WIDTH) - 1) |
639 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
640 | |
641 | static inline enum zone_type page_zonenum(const struct page *page) |
642 | { |
643 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
644 | } |
645 | |
646 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
647 | #define SECTION_IN_PAGE_FLAGS |
648 | #endif |
649 | |
650 | /* |
651 | * The identification function is mainly used by the buddy allocator for |
652 | * determining if two pages could be buddies. We are not really identifying |
653 | * the zone since we could be using the section number id if we do not have |
654 | * node id available in page flags. |
655 | * We only guarantee that it will return the same value for two combinable |
656 | * pages in a zone. |
657 | */ |
658 | static inline int page_zone_id(struct page *page) |
659 | { |
660 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
661 | } |
662 | |
663 | static inline int zone_to_nid(struct zone *zone) |
664 | { |
665 | #ifdef CONFIG_NUMA |
666 | return zone->node; |
667 | #else |
668 | return 0; |
669 | #endif |
670 | } |
671 | |
672 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
673 | extern int page_to_nid(const struct page *page); |
674 | #else |
675 | static inline int page_to_nid(const struct page *page) |
676 | { |
677 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
678 | } |
679 | #endif |
680 | |
681 | #ifdef CONFIG_NUMA_BALANCING |
682 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
683 | { |
684 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
685 | } |
686 | |
687 | static inline int cpupid_to_pid(int cpupid) |
688 | { |
689 | return cpupid & LAST__PID_MASK; |
690 | } |
691 | |
692 | static inline int cpupid_to_cpu(int cpupid) |
693 | { |
694 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
695 | } |
696 | |
697 | static inline int cpupid_to_nid(int cpupid) |
698 | { |
699 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
700 | } |
701 | |
702 | static inline bool cpupid_pid_unset(int cpupid) |
703 | { |
704 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
705 | } |
706 | |
707 | static inline bool cpupid_cpu_unset(int cpupid) |
708 | { |
709 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
710 | } |
711 | |
712 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
713 | { |
714 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); |
715 | } |
716 | |
717 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) |
718 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
719 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) |
720 | { |
721 | return xchg(&page->_last_cpupid, cpupid); |
722 | } |
723 | |
724 | static inline int page_cpupid_last(struct page *page) |
725 | { |
726 | return page->_last_cpupid; |
727 | } |
728 | static inline void page_cpupid_reset_last(struct page *page) |
729 | { |
730 | page->_last_cpupid = -1; |
731 | } |
732 | #else |
733 | static inline int page_cpupid_last(struct page *page) |
734 | { |
735 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
736 | } |
737 | |
738 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
739 | |
740 | static inline void page_cpupid_reset_last(struct page *page) |
741 | { |
742 | int cpupid = (1 << LAST_CPUPID_SHIFT) - 1; |
743 | |
744 | page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT); |
745 | page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT; |
746 | } |
747 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
748 | #else /* !CONFIG_NUMA_BALANCING */ |
749 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) |
750 | { |
751 | return page_to_nid(page); /* XXX */ |
752 | } |
753 | |
754 | static inline int page_cpupid_last(struct page *page) |
755 | { |
756 | return page_to_nid(page); /* XXX */ |
757 | } |
758 | |
759 | static inline int cpupid_to_nid(int cpupid) |
760 | { |
761 | return -1; |
762 | } |
763 | |
764 | static inline int cpupid_to_pid(int cpupid) |
765 | { |
766 | return -1; |
767 | } |
768 | |
769 | static inline int cpupid_to_cpu(int cpupid) |
770 | { |
771 | return -1; |
772 | } |
773 | |
774 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
775 | { |
776 | return -1; |
777 | } |
778 | |
779 | static inline bool cpupid_pid_unset(int cpupid) |
780 | { |
781 | return 1; |
782 | } |
783 | |
784 | static inline void page_cpupid_reset_last(struct page *page) |
785 | { |
786 | } |
787 | |
788 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) |
789 | { |
790 | return false; |
791 | } |
792 | #endif /* CONFIG_NUMA_BALANCING */ |
793 | |
794 | static inline struct zone *page_zone(const struct page *page) |
795 | { |
796 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; |
797 | } |
798 | |
799 | #ifdef SECTION_IN_PAGE_FLAGS |
800 | static inline void set_page_section(struct page *page, unsigned long section) |
801 | { |
802 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); |
803 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; |
804 | } |
805 | |
806 | static inline unsigned long page_to_section(const struct page *page) |
807 | { |
808 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; |
809 | } |
810 | #endif |
811 | |
812 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
813 | { |
814 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); |
815 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; |
816 | } |
817 | |
818 | static inline void set_page_node(struct page *page, unsigned long node) |
819 | { |
820 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); |
821 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; |
822 | } |
823 | |
824 | static inline void set_page_links(struct page *page, enum zone_type zone, |
825 | unsigned long node, unsigned long pfn) |
826 | { |
827 | set_page_zone(page, zone); |
828 | set_page_node(page, node); |
829 | #ifdef SECTION_IN_PAGE_FLAGS |
830 | set_page_section(page, pfn_to_section_nr(pfn)); |
831 | #endif |
832 | } |
833 | |
834 | /* |
835 | * Some inline functions in vmstat.h depend on page_zone() |
836 | */ |
837 | #include <linux/vmstat.h> |
838 | |
839 | static __always_inline void *lowmem_page_address(const struct page *page) |
840 | { |
841 | return __va(PFN_PHYS(page_to_pfn(page))); |
842 | } |
843 | |
844 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) |
845 | #define HASHED_PAGE_VIRTUAL |
846 | #endif |
847 | |
848 | #if defined(WANT_PAGE_VIRTUAL) |
849 | #define page_address(page) ((page)->virtual) |
850 | #define set_page_address(page, address) \ |
851 | do { \ |
852 | (page)->virtual = (address); \ |
853 | } while(0) |
854 | #define page_address_init() do { } while(0) |
855 | #endif |
856 | |
857 | #if defined(HASHED_PAGE_VIRTUAL) |
858 | void *page_address(const struct page *page); |
859 | void set_page_address(struct page *page, void *virtual); |
860 | void page_address_init(void); |
861 | #endif |
862 | |
863 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) |
864 | #define page_address(page) lowmem_page_address(page) |
865 | #define set_page_address(page, address) do { } while(0) |
866 | #define page_address_init() do { } while(0) |
867 | #endif |
868 | |
869 | /* |
870 | * On an anonymous page mapped into a user virtual memory area, |
871 | * page->mapping points to its anon_vma, not to a struct address_space; |
872 | * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. |
873 | * |
874 | * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled, |
875 | * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit; |
876 | * and then page->mapping points, not to an anon_vma, but to a private |
877 | * structure which KSM associates with that merged page. See ksm.h. |
878 | * |
879 | * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used. |
880 | * |
881 | * Please note that, confusingly, "page_mapping" refers to the inode |
882 | * address_space which maps the page from disk; whereas "page_mapped" |
883 | * refers to user virtual address space into which the page is mapped. |
884 | */ |
885 | #define PAGE_MAPPING_ANON 1 |
886 | #define PAGE_MAPPING_KSM 2 |
887 | #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM) |
888 | |
889 | extern struct address_space *page_mapping(struct page *page); |
890 | |
891 | /* Neutral page->mapping pointer to address_space or anon_vma or other */ |
892 | static inline void *page_rmapping(struct page *page) |
893 | { |
894 | return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS); |
895 | } |
896 | |
897 | extern struct address_space *__page_file_mapping(struct page *); |
898 | |
899 | static inline |
900 | struct address_space *page_file_mapping(struct page *page) |
901 | { |
902 | if (unlikely(PageSwapCache(page))) |
903 | return __page_file_mapping(page); |
904 | |
905 | return page->mapping; |
906 | } |
907 | |
908 | static inline int PageAnon(struct page *page) |
909 | { |
910 | return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; |
911 | } |
912 | |
913 | /* |
914 | * Return the pagecache index of the passed page. Regular pagecache pages |
915 | * use ->index whereas swapcache pages use ->private |
916 | */ |
917 | static inline pgoff_t page_index(struct page *page) |
918 | { |
919 | if (unlikely(PageSwapCache(page))) |
920 | return page_private(page); |
921 | return page->index; |
922 | } |
923 | |
924 | extern pgoff_t __page_file_index(struct page *page); |
925 | |
926 | /* |
927 | * Return the file index of the page. Regular pagecache pages use ->index |
928 | * whereas swapcache pages use swp_offset(->private) |
929 | */ |
930 | static inline pgoff_t page_file_index(struct page *page) |
931 | { |
932 | if (unlikely(PageSwapCache(page))) |
933 | return __page_file_index(page); |
934 | |
935 | return page->index; |
936 | } |
937 | |
938 | /* |
939 | * Return true if this page is mapped into pagetables. |
940 | */ |
941 | static inline int page_mapped(struct page *page) |
942 | { |
943 | return atomic_read(&(page)->_mapcount) >= 0; |
944 | } |
945 | |
946 | /* |
947 | * Different kinds of faults, as returned by handle_mm_fault(). |
948 | * Used to decide whether a process gets delivered SIGBUS or |
949 | * just gets major/minor fault counters bumped up. |
950 | */ |
951 | |
952 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ |
953 | |
954 | #define VM_FAULT_OOM 0x0001 |
955 | #define VM_FAULT_SIGBUS 0x0002 |
956 | #define VM_FAULT_MAJOR 0x0004 |
957 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ |
958 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ |
959 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ |
960 | |
961 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
962 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ |
963 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ |
964 | #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */ |
965 | |
966 | #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ |
967 | |
968 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \ |
969 | VM_FAULT_FALLBACK | VM_FAULT_HWPOISON_LARGE) |
970 | |
971 | /* Encode hstate index for a hwpoisoned large page */ |
972 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12) |
973 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) |
974 | |
975 | /* |
976 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. |
977 | */ |
978 | extern void pagefault_out_of_memory(void); |
979 | |
980 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
981 | |
982 | /* |
983 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
984 | * various contexts. |
985 | */ |
986 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
987 | #define SHOW_MEM_FILTER_PAGE_COUNT (0x0002u) /* page type count */ |
988 | |
989 | extern void show_free_areas(unsigned int flags); |
990 | extern bool skip_free_areas_node(unsigned int flags, int nid); |
991 | |
992 | int shmem_zero_setup(struct vm_area_struct *); |
993 | |
994 | extern int can_do_mlock(void); |
995 | extern int user_shm_lock(size_t, struct user_struct *); |
996 | extern void user_shm_unlock(size_t, struct user_struct *); |
997 | |
998 | /* |
999 | * Parameter block passed down to zap_pte_range in exceptional cases. |
1000 | */ |
1001 | struct zap_details { |
1002 | struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ |
1003 | struct address_space *check_mapping; /* Check page->mapping if set */ |
1004 | pgoff_t first_index; /* Lowest page->index to unmap */ |
1005 | pgoff_t last_index; /* Highest page->index to unmap */ |
1006 | }; |
1007 | |
1008 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
1009 | pte_t pte); |
1010 | |
1011 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
1012 | unsigned long size); |
1013 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
1014 | unsigned long size, struct zap_details *); |
1015 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
1016 | unsigned long start, unsigned long end); |
1017 | |
1018 | /** |
1019 | * mm_walk - callbacks for walk_page_range |
1020 | * @pgd_entry: if set, called for each non-empty PGD (top-level) entry |
1021 | * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry |
1022 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry |
1023 | * this handler is required to be able to handle |
1024 | * pmd_trans_huge() pmds. They may simply choose to |
1025 | * split_huge_page() instead of handling it explicitly. |
1026 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
1027 | * @pte_hole: if set, called for each hole at all levels |
1028 | * @hugetlb_entry: if set, called for each hugetlb entry |
1029 | * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry |
1030 | * is used. |
1031 | * |
1032 | * (see walk_page_range for more details) |
1033 | */ |
1034 | struct mm_walk { |
1035 | int (*pgd_entry)(pgd_t *pgd, unsigned long addr, |
1036 | unsigned long next, struct mm_walk *walk); |
1037 | int (*pud_entry)(pud_t *pud, unsigned long addr, |
1038 | unsigned long next, struct mm_walk *walk); |
1039 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr, |
1040 | unsigned long next, struct mm_walk *walk); |
1041 | int (*pte_entry)(pte_t *pte, unsigned long addr, |
1042 | unsigned long next, struct mm_walk *walk); |
1043 | int (*pte_hole)(unsigned long addr, unsigned long next, |
1044 | struct mm_walk *walk); |
1045 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, |
1046 | unsigned long addr, unsigned long next, |
1047 | struct mm_walk *walk); |
1048 | struct mm_struct *mm; |
1049 | void *private; |
1050 | }; |
1051 | |
1052 | int walk_page_range(unsigned long addr, unsigned long end, |
1053 | struct mm_walk *walk); |
1054 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
1055 | unsigned long end, unsigned long floor, unsigned long ceiling); |
1056 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
1057 | struct vm_area_struct *vma); |
1058 | void unmap_mapping_range(struct address_space *mapping, |
1059 | loff_t const holebegin, loff_t const holelen, int even_cows); |
1060 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
1061 | unsigned long *pfn); |
1062 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
1063 | unsigned int flags, unsigned long *prot, resource_size_t *phys); |
1064 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
1065 | void *buf, int len, int write); |
1066 | |
1067 | static inline void unmap_shared_mapping_range(struct address_space *mapping, |
1068 | loff_t const holebegin, loff_t const holelen) |
1069 | { |
1070 | unmap_mapping_range(mapping, holebegin, holelen, 0); |
1071 | } |
1072 | |
1073 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
1074 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
1075 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
1076 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
1077 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
1078 | int invalidate_inode_page(struct page *page); |
1079 | |
1080 | #ifdef CONFIG_MMU |
1081 | extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
1082 | unsigned long address, unsigned int flags); |
1083 | extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, |
1084 | unsigned long address, unsigned int fault_flags); |
1085 | #else |
1086 | static inline int handle_mm_fault(struct mm_struct *mm, |
1087 | struct vm_area_struct *vma, unsigned long address, |
1088 | unsigned int flags) |
1089 | { |
1090 | /* should never happen if there's no MMU */ |
1091 | BUG(); |
1092 | return VM_FAULT_SIGBUS; |
1093 | } |
1094 | static inline int fixup_user_fault(struct task_struct *tsk, |
1095 | struct mm_struct *mm, unsigned long address, |
1096 | unsigned int fault_flags) |
1097 | { |
1098 | /* should never happen if there's no MMU */ |
1099 | BUG(); |
1100 | return -EFAULT; |
1101 | } |
1102 | #endif |
1103 | |
1104 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); |
1105 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
1106 | void *buf, int len, int write); |
1107 | |
1108 | long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
1109 | unsigned long start, unsigned long nr_pages, |
1110 | unsigned int foll_flags, struct page **pages, |
1111 | struct vm_area_struct **vmas, int *nonblocking); |
1112 | long get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
1113 | unsigned long start, unsigned long nr_pages, |
1114 | int write, int force, struct page **pages, |
1115 | struct vm_area_struct **vmas); |
1116 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
1117 | struct page **pages); |
1118 | struct kvec; |
1119 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, |
1120 | struct page **pages); |
1121 | int get_kernel_page(unsigned long start, int write, struct page **pages); |
1122 | struct page *get_dump_page(unsigned long addr); |
1123 | |
1124 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
1125 | extern void do_invalidatepage(struct page *page, unsigned int offset, |
1126 | unsigned int length); |
1127 | |
1128 | int __set_page_dirty_nobuffers(struct page *page); |
1129 | int __set_page_dirty_no_writeback(struct page *page); |
1130 | int redirty_page_for_writepage(struct writeback_control *wbc, |
1131 | struct page *page); |
1132 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
1133 | void account_page_writeback(struct page *page); |
1134 | int set_page_dirty(struct page *page); |
1135 | int set_page_dirty_lock(struct page *page); |
1136 | int clear_page_dirty_for_io(struct page *page); |
1137 | |
1138 | /* Is the vma a continuation of the stack vma above it? */ |
1139 | static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr) |
1140 | { |
1141 | return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); |
1142 | } |
1143 | |
1144 | static inline int stack_guard_page_start(struct vm_area_struct *vma, |
1145 | unsigned long addr) |
1146 | { |
1147 | return (vma->vm_flags & VM_GROWSDOWN) && |
1148 | (vma->vm_start == addr) && |
1149 | !vma_growsdown(vma->vm_prev, addr); |
1150 | } |
1151 | |
1152 | /* Is the vma a continuation of the stack vma below it? */ |
1153 | static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr) |
1154 | { |
1155 | return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP); |
1156 | } |
1157 | |
1158 | static inline int stack_guard_page_end(struct vm_area_struct *vma, |
1159 | unsigned long addr) |
1160 | { |
1161 | return (vma->vm_flags & VM_GROWSUP) && |
1162 | (vma->vm_end == addr) && |
1163 | !vma_growsup(vma->vm_next, addr); |
1164 | } |
1165 | |
1166 | extern pid_t |
1167 | vm_is_stack(struct task_struct *task, struct vm_area_struct *vma, int in_group); |
1168 | |
1169 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
1170 | unsigned long old_addr, struct vm_area_struct *new_vma, |
1171 | unsigned long new_addr, unsigned long len, |
1172 | bool need_rmap_locks); |
1173 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
1174 | unsigned long end, pgprot_t newprot, |
1175 | int dirty_accountable, int prot_numa); |
1176 | extern int mprotect_fixup(struct vm_area_struct *vma, |
1177 | struct vm_area_struct **pprev, unsigned long start, |
1178 | unsigned long end, unsigned long newflags); |
1179 | |
1180 | /* |
1181 | * doesn't attempt to fault and will return short. |
1182 | */ |
1183 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, |
1184 | struct page **pages); |
1185 | /* |
1186 | * per-process(per-mm_struct) statistics. |
1187 | */ |
1188 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
1189 | { |
1190 | long val = atomic_long_read(&mm->rss_stat.count[member]); |
1191 | |
1192 | #ifdef SPLIT_RSS_COUNTING |
1193 | /* |
1194 | * counter is updated in asynchronous manner and may go to minus. |
1195 | * But it's never be expected number for users. |
1196 | */ |
1197 | if (val < 0) |
1198 | val = 0; |
1199 | #endif |
1200 | return (unsigned long)val; |
1201 | } |
1202 | |
1203 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) |
1204 | { |
1205 | atomic_long_add(value, &mm->rss_stat.count[member]); |
1206 | } |
1207 | |
1208 | static inline void inc_mm_counter(struct mm_struct *mm, int member) |
1209 | { |
1210 | atomic_long_inc(&mm->rss_stat.count[member]); |
1211 | } |
1212 | |
1213 | static inline void dec_mm_counter(struct mm_struct *mm, int member) |
1214 | { |
1215 | atomic_long_dec(&mm->rss_stat.count[member]); |
1216 | } |
1217 | |
1218 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
1219 | { |
1220 | return get_mm_counter(mm, MM_FILEPAGES) + |
1221 | get_mm_counter(mm, MM_ANONPAGES); |
1222 | } |
1223 | |
1224 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) |
1225 | { |
1226 | return max(mm->hiwater_rss, get_mm_rss(mm)); |
1227 | } |
1228 | |
1229 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) |
1230 | { |
1231 | return max(mm->hiwater_vm, mm->total_vm); |
1232 | } |
1233 | |
1234 | static inline void update_hiwater_rss(struct mm_struct *mm) |
1235 | { |
1236 | unsigned long _rss = get_mm_rss(mm); |
1237 | |
1238 | if ((mm)->hiwater_rss < _rss) |
1239 | (mm)->hiwater_rss = _rss; |
1240 | } |
1241 | |
1242 | static inline void update_hiwater_vm(struct mm_struct *mm) |
1243 | { |
1244 | if (mm->hiwater_vm < mm->total_vm) |
1245 | mm->hiwater_vm = mm->total_vm; |
1246 | } |
1247 | |
1248 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
1249 | struct mm_struct *mm) |
1250 | { |
1251 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); |
1252 | |
1253 | if (*maxrss < hiwater_rss) |
1254 | *maxrss = hiwater_rss; |
1255 | } |
1256 | |
1257 | #if defined(SPLIT_RSS_COUNTING) |
1258 | void sync_mm_rss(struct mm_struct *mm); |
1259 | #else |
1260 | static inline void sync_mm_rss(struct mm_struct *mm) |
1261 | { |
1262 | } |
1263 | #endif |
1264 | |
1265 | int vma_wants_writenotify(struct vm_area_struct *vma); |
1266 | |
1267 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
1268 | spinlock_t **ptl); |
1269 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, |
1270 | spinlock_t **ptl) |
1271 | { |
1272 | pte_t *ptep; |
1273 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); |
1274 | return ptep; |
1275 | } |
1276 | |
1277 | #ifdef __PAGETABLE_PUD_FOLDED |
1278 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, |
1279 | unsigned long address) |
1280 | { |
1281 | return 0; |
1282 | } |
1283 | #else |
1284 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
1285 | #endif |
1286 | |
1287 | #ifdef __PAGETABLE_PMD_FOLDED |
1288 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
1289 | unsigned long address) |
1290 | { |
1291 | return 0; |
1292 | } |
1293 | #else |
1294 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
1295 | #endif |
1296 | |
1297 | int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, |
1298 | pmd_t *pmd, unsigned long address); |
1299 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
1300 | |
1301 | /* |
1302 | * The following ifdef needed to get the 4level-fixup.h header to work. |
1303 | * Remove it when 4level-fixup.h has been removed. |
1304 | */ |
1305 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
1306 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
1307 | { |
1308 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
1309 | NULL: pud_offset(pgd, address); |
1310 | } |
1311 | |
1312 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) |
1313 | { |
1314 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
1315 | NULL: pmd_offset(pud, address); |
1316 | } |
1317 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
1318 | |
1319 | #if USE_SPLIT_PTE_PTLOCKS |
1320 | #if ALLOC_SPLIT_PTLOCKS |
1321 | extern bool ptlock_alloc(struct page *page); |
1322 | extern void ptlock_free(struct page *page); |
1323 | |
1324 | static inline spinlock_t *ptlock_ptr(struct page *page) |
1325 | { |
1326 | return page->ptl; |
1327 | } |
1328 | #else /* ALLOC_SPLIT_PTLOCKS */ |
1329 | static inline bool ptlock_alloc(struct page *page) |
1330 | { |
1331 | return true; |
1332 | } |
1333 | |
1334 | static inline void ptlock_free(struct page *page) |
1335 | { |
1336 | } |
1337 | |
1338 | static inline spinlock_t *ptlock_ptr(struct page *page) |
1339 | { |
1340 | return &page->ptl; |
1341 | } |
1342 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
1343 | |
1344 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1345 | { |
1346 | return ptlock_ptr(pmd_page(*pmd)); |
1347 | } |
1348 | |
1349 | static inline bool ptlock_init(struct page *page) |
1350 | { |
1351 | /* |
1352 | * prep_new_page() initialize page->private (and therefore page->ptl) |
1353 | * with 0. Make sure nobody took it in use in between. |
1354 | * |
1355 | * It can happen if arch try to use slab for page table allocation: |
1356 | * slab code uses page->slab_cache and page->first_page (for tail |
1357 | * pages), which share storage with page->ptl. |
1358 | */ |
1359 | VM_BUG_ON(*(unsigned long *)&page->ptl); |
1360 | if (!ptlock_alloc(page)) |
1361 | return false; |
1362 | spin_lock_init(ptlock_ptr(page)); |
1363 | return true; |
1364 | } |
1365 | |
1366 | /* Reset page->mapping so free_pages_check won't complain. */ |
1367 | static inline void pte_lock_deinit(struct page *page) |
1368 | { |
1369 | page->mapping = NULL; |
1370 | ptlock_free(page); |
1371 | } |
1372 | |
1373 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
1374 | /* |
1375 | * We use mm->page_table_lock to guard all pagetable pages of the mm. |
1376 | */ |
1377 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1378 | { |
1379 | return &mm->page_table_lock; |
1380 | } |
1381 | static inline bool ptlock_init(struct page *page) { return true; } |
1382 | static inline void pte_lock_deinit(struct page *page) {} |
1383 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
1384 | |
1385 | static inline bool pgtable_page_ctor(struct page *page) |
1386 | { |
1387 | inc_zone_page_state(page, NR_PAGETABLE); |
1388 | return ptlock_init(page); |
1389 | } |
1390 | |
1391 | static inline void pgtable_page_dtor(struct page *page) |
1392 | { |
1393 | pte_lock_deinit(page); |
1394 | dec_zone_page_state(page, NR_PAGETABLE); |
1395 | } |
1396 | |
1397 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
1398 | ({ \ |
1399 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
1400 | pte_t *__pte = pte_offset_map(pmd, address); \ |
1401 | *(ptlp) = __ptl; \ |
1402 | spin_lock(__ptl); \ |
1403 | __pte; \ |
1404 | }) |
1405 | |
1406 | #define pte_unmap_unlock(pte, ptl) do { \ |
1407 | spin_unlock(ptl); \ |
1408 | pte_unmap(pte); \ |
1409 | } while (0) |
1410 | |
1411 | #define pte_alloc_map(mm, vma, pmd, address) \ |
1412 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \ |
1413 | pmd, address))? \ |
1414 | NULL: pte_offset_map(pmd, address)) |
1415 | |
1416 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
1417 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \ |
1418 | pmd, address))? \ |
1419 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) |
1420 | |
1421 | #define pte_alloc_kernel(pmd, address) \ |
1422 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
1423 | NULL: pte_offset_kernel(pmd, address)) |
1424 | |
1425 | #if USE_SPLIT_PMD_PTLOCKS |
1426 | |
1427 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1428 | { |
1429 | return ptlock_ptr(virt_to_page(pmd)); |
1430 | } |
1431 | |
1432 | static inline bool pgtable_pmd_page_ctor(struct page *page) |
1433 | { |
1434 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1435 | page->pmd_huge_pte = NULL; |
1436 | #endif |
1437 | return ptlock_init(page); |
1438 | } |
1439 | |
1440 | static inline void pgtable_pmd_page_dtor(struct page *page) |
1441 | { |
1442 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1443 | VM_BUG_ON(page->pmd_huge_pte); |
1444 | #endif |
1445 | ptlock_free(page); |
1446 | } |
1447 | |
1448 | #define pmd_huge_pte(mm, pmd) (virt_to_page(pmd)->pmd_huge_pte) |
1449 | |
1450 | #else |
1451 | |
1452 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1453 | { |
1454 | return &mm->page_table_lock; |
1455 | } |
1456 | |
1457 | static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } |
1458 | static inline void pgtable_pmd_page_dtor(struct page *page) {} |
1459 | |
1460 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
1461 | |
1462 | #endif |
1463 | |
1464 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
1465 | { |
1466 | spinlock_t *ptl = pmd_lockptr(mm, pmd); |
1467 | spin_lock(ptl); |
1468 | return ptl; |
1469 | } |
1470 | |
1471 | extern void free_area_init(unsigned long * zones_size); |
1472 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
1473 | unsigned long zone_start_pfn, unsigned long *zholes_size); |
1474 | extern void free_initmem(void); |
1475 | |
1476 | /* |
1477 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) |
1478 | * into the buddy system. The freed pages will be poisoned with pattern |
1479 | * "poison" if it's within range [0, UCHAR_MAX]. |
1480 | * Return pages freed into the buddy system. |
1481 | */ |
1482 | extern unsigned long free_reserved_area(void *start, void *end, |
1483 | int poison, char *s); |
1484 | |
1485 | #ifdef CONFIG_HIGHMEM |
1486 | /* |
1487 | * Free a highmem page into the buddy system, adjusting totalhigh_pages |
1488 | * and totalram_pages. |
1489 | */ |
1490 | extern void free_highmem_page(struct page *page); |
1491 | #endif |
1492 | |
1493 | extern void adjust_managed_page_count(struct page *page, long count); |
1494 | extern void mem_init_print_info(const char *str); |
1495 | |
1496 | /* Free the reserved page into the buddy system, so it gets managed. */ |
1497 | static inline void __free_reserved_page(struct page *page) |
1498 | { |
1499 | ClearPageReserved(page); |
1500 | init_page_count(page); |
1501 | __free_page(page); |
1502 | } |
1503 | |
1504 | static inline void free_reserved_page(struct page *page) |
1505 | { |
1506 | __free_reserved_page(page); |
1507 | adjust_managed_page_count(page, 1); |
1508 | } |
1509 | |
1510 | static inline void mark_page_reserved(struct page *page) |
1511 | { |
1512 | SetPageReserved(page); |
1513 | adjust_managed_page_count(page, -1); |
1514 | } |
1515 | |
1516 | /* |
1517 | * Default method to free all the __init memory into the buddy system. |
1518 | * The freed pages will be poisoned with pattern "poison" if it's within |
1519 | * range [0, UCHAR_MAX]. |
1520 | * Return pages freed into the buddy system. |
1521 | */ |
1522 | static inline unsigned long free_initmem_default(int poison) |
1523 | { |
1524 | extern char __init_begin[], __init_end[]; |
1525 | |
1526 | return free_reserved_area(&__init_begin, &__init_end, |
1527 | poison, "unused kernel"); |
1528 | } |
1529 | |
1530 | static inline unsigned long get_num_physpages(void) |
1531 | { |
1532 | int nid; |
1533 | unsigned long phys_pages = 0; |
1534 | |
1535 | for_each_online_node(nid) |
1536 | phys_pages += node_present_pages(nid); |
1537 | |
1538 | return phys_pages; |
1539 | } |
1540 | |
1541 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
1542 | /* |
1543 | * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its |
1544 | * zones, allocate the backing mem_map and account for memory holes in a more |
1545 | * architecture independent manner. This is a substitute for creating the |
1546 | * zone_sizes[] and zholes_size[] arrays and passing them to |
1547 | * free_area_init_node() |
1548 | * |
1549 | * An architecture is expected to register range of page frames backed by |
1550 | * physical memory with memblock_add[_node]() before calling |
1551 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
1552 | * usage, an architecture is expected to do something like |
1553 | * |
1554 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, |
1555 | * max_highmem_pfn}; |
1556 | * for_each_valid_physical_page_range() |
1557 | * memblock_add_node(base, size, nid) |
1558 | * free_area_init_nodes(max_zone_pfns); |
1559 | * |
1560 | * free_bootmem_with_active_regions() calls free_bootmem_node() for each |
1561 | * registered physical page range. Similarly |
1562 | * sparse_memory_present_with_active_regions() calls memory_present() for |
1563 | * each range when SPARSEMEM is enabled. |
1564 | * |
1565 | * See mm/page_alloc.c for more information on each function exposed by |
1566 | * CONFIG_HAVE_MEMBLOCK_NODE_MAP. |
1567 | */ |
1568 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); |
1569 | unsigned long node_map_pfn_alignment(void); |
1570 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
1571 | unsigned long end_pfn); |
1572 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
1573 | unsigned long end_pfn); |
1574 | extern void get_pfn_range_for_nid(unsigned int nid, |
1575 | unsigned long *start_pfn, unsigned long *end_pfn); |
1576 | extern unsigned long find_min_pfn_with_active_regions(void); |
1577 | extern void free_bootmem_with_active_regions(int nid, |
1578 | unsigned long max_low_pfn); |
1579 | extern void sparse_memory_present_with_active_regions(int nid); |
1580 | |
1581 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
1582 | |
1583 | #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ |
1584 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) |
1585 | static inline int __early_pfn_to_nid(unsigned long pfn) |
1586 | { |
1587 | return 0; |
1588 | } |
1589 | #else |
1590 | /* please see mm/page_alloc.c */ |
1591 | extern int __meminit early_pfn_to_nid(unsigned long pfn); |
1592 | #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID |
1593 | /* there is a per-arch backend function. */ |
1594 | extern int __meminit __early_pfn_to_nid(unsigned long pfn); |
1595 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ |
1596 | #endif |
1597 | |
1598 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
1599 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
1600 | unsigned long, enum memmap_context); |
1601 | extern void setup_per_zone_wmarks(void); |
1602 | extern int __meminit init_per_zone_wmark_min(void); |
1603 | extern void mem_init(void); |
1604 | extern void __init mmap_init(void); |
1605 | extern void show_mem(unsigned int flags); |
1606 | extern void si_meminfo(struct sysinfo * val); |
1607 | extern void si_meminfo_node(struct sysinfo *val, int nid); |
1608 | |
1609 | extern __printf(3, 4) |
1610 | void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...); |
1611 | |
1612 | extern void setup_per_cpu_pageset(void); |
1613 | |
1614 | extern void zone_pcp_update(struct zone *zone); |
1615 | extern void zone_pcp_reset(struct zone *zone); |
1616 | |
1617 | /* page_alloc.c */ |
1618 | extern int min_free_kbytes; |
1619 | |
1620 | /* nommu.c */ |
1621 | extern atomic_long_t mmap_pages_allocated; |
1622 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
1623 | |
1624 | /* interval_tree.c */ |
1625 | void vma_interval_tree_insert(struct vm_area_struct *node, |
1626 | struct rb_root *root); |
1627 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
1628 | struct vm_area_struct *prev, |
1629 | struct rb_root *root); |
1630 | void vma_interval_tree_remove(struct vm_area_struct *node, |
1631 | struct rb_root *root); |
1632 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root, |
1633 | unsigned long start, unsigned long last); |
1634 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, |
1635 | unsigned long start, unsigned long last); |
1636 | |
1637 | #define vma_interval_tree_foreach(vma, root, start, last) \ |
1638 | for (vma = vma_interval_tree_iter_first(root, start, last); \ |
1639 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) |
1640 | |
1641 | static inline void vma_nonlinear_insert(struct vm_area_struct *vma, |
1642 | struct list_head *list) |
1643 | { |
1644 | list_add_tail(&vma->shared.nonlinear, list); |
1645 | } |
1646 | |
1647 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
1648 | struct rb_root *root); |
1649 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, |
1650 | struct rb_root *root); |
1651 | struct anon_vma_chain *anon_vma_interval_tree_iter_first( |
1652 | struct rb_root *root, unsigned long start, unsigned long last); |
1653 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( |
1654 | struct anon_vma_chain *node, unsigned long start, unsigned long last); |
1655 | #ifdef CONFIG_DEBUG_VM_RB |
1656 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); |
1657 | #endif |
1658 | |
1659 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ |
1660 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ |
1661 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) |
1662 | |
1663 | /* mmap.c */ |
1664 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
1665 | extern int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
1666 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
1667 | extern struct vm_area_struct *vma_merge(struct mm_struct *, |
1668 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, |
1669 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, |
1670 | struct mempolicy *); |
1671 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
1672 | extern int split_vma(struct mm_struct *, |
1673 | struct vm_area_struct *, unsigned long addr, int new_below); |
1674 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
1675 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, |
1676 | struct rb_node **, struct rb_node *); |
1677 | extern void unlink_file_vma(struct vm_area_struct *); |
1678 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
1679 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
1680 | bool *need_rmap_locks); |
1681 | extern void exit_mmap(struct mm_struct *); |
1682 | |
1683 | extern int mm_take_all_locks(struct mm_struct *mm); |
1684 | extern void mm_drop_all_locks(struct mm_struct *mm); |
1685 | |
1686 | extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
1687 | extern struct file *get_mm_exe_file(struct mm_struct *mm); |
1688 | |
1689 | extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); |
1690 | extern int install_special_mapping(struct mm_struct *mm, |
1691 | unsigned long addr, unsigned long len, |
1692 | unsigned long flags, struct page **pages); |
1693 | |
1694 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
1695 | |
1696 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
1697 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff); |
1698 | extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, |
1699 | unsigned long len, unsigned long prot, unsigned long flags, |
1700 | unsigned long pgoff, unsigned long *populate); |
1701 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
1702 | |
1703 | #ifdef CONFIG_MMU |
1704 | extern int __mm_populate(unsigned long addr, unsigned long len, |
1705 | int ignore_errors); |
1706 | static inline void mm_populate(unsigned long addr, unsigned long len) |
1707 | { |
1708 | /* Ignore errors */ |
1709 | (void) __mm_populate(addr, len, 1); |
1710 | } |
1711 | #else |
1712 | static inline void mm_populate(unsigned long addr, unsigned long len) {} |
1713 | #endif |
1714 | |
1715 | /* These take the mm semaphore themselves */ |
1716 | extern unsigned long vm_brk(unsigned long, unsigned long); |
1717 | extern int vm_munmap(unsigned long, size_t); |
1718 | extern unsigned long vm_mmap(struct file *, unsigned long, |
1719 | unsigned long, unsigned long, |
1720 | unsigned long, unsigned long); |
1721 | |
1722 | struct vm_unmapped_area_info { |
1723 | #define VM_UNMAPPED_AREA_TOPDOWN 1 |
1724 | unsigned long flags; |
1725 | unsigned long length; |
1726 | unsigned long low_limit; |
1727 | unsigned long high_limit; |
1728 | unsigned long align_mask; |
1729 | unsigned long align_offset; |
1730 | }; |
1731 | |
1732 | extern unsigned long unmapped_area(struct vm_unmapped_area_info *info); |
1733 | extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); |
1734 | |
1735 | /* |
1736 | * Search for an unmapped address range. |
1737 | * |
1738 | * We are looking for a range that: |
1739 | * - does not intersect with any VMA; |
1740 | * - is contained within the [low_limit, high_limit) interval; |
1741 | * - is at least the desired size. |
1742 | * - satisfies (begin_addr & align_mask) == (align_offset & align_mask) |
1743 | */ |
1744 | static inline unsigned long |
1745 | vm_unmapped_area(struct vm_unmapped_area_info *info) |
1746 | { |
1747 | if (!(info->flags & VM_UNMAPPED_AREA_TOPDOWN)) |
1748 | return unmapped_area(info); |
1749 | else |
1750 | return unmapped_area_topdown(info); |
1751 | } |
1752 | |
1753 | /* truncate.c */ |
1754 | extern void truncate_inode_pages(struct address_space *, loff_t); |
1755 | extern void truncate_inode_pages_range(struct address_space *, |
1756 | loff_t lstart, loff_t lend); |
1757 | |
1758 | /* generic vm_area_ops exported for stackable file systems */ |
1759 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
1760 | extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
1761 | |
1762 | /* mm/page-writeback.c */ |
1763 | int write_one_page(struct page *page, int wait); |
1764 | void task_dirty_inc(struct task_struct *tsk); |
1765 | |
1766 | /* readahead.c */ |
1767 | #define VM_MAX_READAHEAD 128 /* kbytes */ |
1768 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ |
1769 | |
1770 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
1771 | pgoff_t offset, unsigned long nr_to_read); |
1772 | |
1773 | void page_cache_sync_readahead(struct address_space *mapping, |
1774 | struct file_ra_state *ra, |
1775 | struct file *filp, |
1776 | pgoff_t offset, |
1777 | unsigned long size); |
1778 | |
1779 | void page_cache_async_readahead(struct address_space *mapping, |
1780 | struct file_ra_state *ra, |
1781 | struct file *filp, |
1782 | struct page *pg, |
1783 | pgoff_t offset, |
1784 | unsigned long size); |
1785 | |
1786 | unsigned long max_sane_readahead(unsigned long nr); |
1787 | unsigned long ra_submit(struct file_ra_state *ra, |
1788 | struct address_space *mapping, |
1789 | struct file *filp); |
1790 | |
1791 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
1792 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
1793 | |
1794 | /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */ |
1795 | extern int expand_downwards(struct vm_area_struct *vma, |
1796 | unsigned long address); |
1797 | #if VM_GROWSUP |
1798 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
1799 | #else |
1800 | #define expand_upwards(vma, address) do { } while (0) |
1801 | #endif |
1802 | |
1803 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ |
1804 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); |
1805 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, |
1806 | struct vm_area_struct **pprev); |
1807 | |
1808 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, |
1809 | NULL if none. Assume start_addr < end_addr. */ |
1810 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) |
1811 | { |
1812 | struct vm_area_struct * vma = find_vma(mm,start_addr); |
1813 | |
1814 | if (vma && end_addr <= vma->vm_start) |
1815 | vma = NULL; |
1816 | return vma; |
1817 | } |
1818 | |
1819 | static inline unsigned long vma_pages(struct vm_area_struct *vma) |
1820 | { |
1821 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
1822 | } |
1823 | |
1824 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
1825 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, |
1826 | unsigned long vm_start, unsigned long vm_end) |
1827 | { |
1828 | struct vm_area_struct *vma = find_vma(mm, vm_start); |
1829 | |
1830 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) |
1831 | vma = NULL; |
1832 | |
1833 | return vma; |
1834 | } |
1835 | |
1836 | #ifdef CONFIG_MMU |
1837 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
1838 | #else |
1839 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) |
1840 | { |
1841 | return __pgprot(0); |
1842 | } |
1843 | #endif |
1844 | |
1845 | #ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE |
1846 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
1847 | unsigned long start, unsigned long end); |
1848 | #endif |
1849 | |
1850 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
1851 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
1852 | unsigned long pfn, unsigned long size, pgprot_t); |
1853 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
1854 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
1855 | unsigned long pfn); |
1856 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
1857 | unsigned long pfn); |
1858 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
1859 | |
1860 | |
1861 | struct page *follow_page_mask(struct vm_area_struct *vma, |
1862 | unsigned long address, unsigned int foll_flags, |
1863 | unsigned int *page_mask); |
1864 | |
1865 | static inline struct page *follow_page(struct vm_area_struct *vma, |
1866 | unsigned long address, unsigned int foll_flags) |
1867 | { |
1868 | unsigned int unused_page_mask; |
1869 | return follow_page_mask(vma, address, foll_flags, &unused_page_mask); |
1870 | } |
1871 | |
1872 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
1873 | #define FOLL_TOUCH 0x02 /* mark page accessed */ |
1874 | #define FOLL_GET 0x04 /* do get_page on page */ |
1875 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
1876 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
1877 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
1878 | * and return without waiting upon it */ |
1879 | #define FOLL_MLOCK 0x40 /* mark page as mlocked */ |
1880 | #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ |
1881 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
1882 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
1883 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
1884 | |
1885 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
1886 | void *data); |
1887 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, |
1888 | unsigned long size, pte_fn_t fn, void *data); |
1889 | |
1890 | #ifdef CONFIG_PROC_FS |
1891 | void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); |
1892 | #else |
1893 | static inline void vm_stat_account(struct mm_struct *mm, |
1894 | unsigned long flags, struct file *file, long pages) |
1895 | { |
1896 | mm->total_vm += pages; |
1897 | } |
1898 | #endif /* CONFIG_PROC_FS */ |
1899 | |
1900 | #ifdef CONFIG_DEBUG_PAGEALLOC |
1901 | extern void kernel_map_pages(struct page *page, int numpages, int enable); |
1902 | #ifdef CONFIG_HIBERNATION |
1903 | extern bool kernel_page_present(struct page *page); |
1904 | #endif /* CONFIG_HIBERNATION */ |
1905 | #else |
1906 | static inline void |
1907 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
1908 | #ifdef CONFIG_HIBERNATION |
1909 | static inline bool kernel_page_present(struct page *page) { return true; } |
1910 | #endif /* CONFIG_HIBERNATION */ |
1911 | #endif |
1912 | |
1913 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
1914 | #ifdef __HAVE_ARCH_GATE_AREA |
1915 | int in_gate_area_no_mm(unsigned long addr); |
1916 | int in_gate_area(struct mm_struct *mm, unsigned long addr); |
1917 | #else |
1918 | int in_gate_area_no_mm(unsigned long addr); |
1919 | #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);}) |
1920 | #endif /* __HAVE_ARCH_GATE_AREA */ |
1921 | |
1922 | #ifdef CONFIG_SYSCTL |
1923 | extern int sysctl_drop_caches; |
1924 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
1925 | void __user *, size_t *, loff_t *); |
1926 | #endif |
1927 | |
1928 | unsigned long shrink_slab(struct shrink_control *shrink, |
1929 | unsigned long nr_pages_scanned, |
1930 | unsigned long lru_pages); |
1931 | |
1932 | #ifndef CONFIG_MMU |
1933 | #define randomize_va_space 0 |
1934 | #else |
1935 | extern int randomize_va_space; |
1936 | #endif |
1937 | |
1938 | const char * arch_vma_name(struct vm_area_struct *vma); |
1939 | void print_vma_addr(char *prefix, unsigned long rip); |
1940 | |
1941 | void sparse_mem_maps_populate_node(struct page **map_map, |
1942 | unsigned long pnum_begin, |
1943 | unsigned long pnum_end, |
1944 | unsigned long map_count, |
1945 | int nodeid); |
1946 | |
1947 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
1948 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
1949 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); |
1950 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
1951 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); |
1952 | void *vmemmap_alloc_block(unsigned long size, int node); |
1953 | void *vmemmap_alloc_block_buf(unsigned long size, int node); |
1954 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
1955 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
1956 | int node); |
1957 | int vmemmap_populate(unsigned long start, unsigned long end, int node); |
1958 | void vmemmap_populate_print_last(void); |
1959 | #ifdef CONFIG_MEMORY_HOTPLUG |
1960 | void vmemmap_free(unsigned long start, unsigned long end); |
1961 | #endif |
1962 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
1963 | unsigned long size); |
1964 | |
1965 | enum mf_flags { |
1966 | MF_COUNT_INCREASED = 1 << 0, |
1967 | MF_ACTION_REQUIRED = 1 << 1, |
1968 | MF_MUST_KILL = 1 << 2, |
1969 | MF_SOFT_OFFLINE = 1 << 3, |
1970 | }; |
1971 | extern int memory_failure(unsigned long pfn, int trapno, int flags); |
1972 | extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); |
1973 | extern int unpoison_memory(unsigned long pfn); |
1974 | extern int sysctl_memory_failure_early_kill; |
1975 | extern int sysctl_memory_failure_recovery; |
1976 | extern void shake_page(struct page *p, int access); |
1977 | extern atomic_long_t num_poisoned_pages; |
1978 | extern int soft_offline_page(struct page *page, int flags); |
1979 | |
1980 | extern void dump_page(struct page *page); |
1981 | |
1982 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
1983 | extern void clear_huge_page(struct page *page, |
1984 | unsigned long addr, |
1985 | unsigned int pages_per_huge_page); |
1986 | extern void copy_user_huge_page(struct page *dst, struct page *src, |
1987 | unsigned long addr, struct vm_area_struct *vma, |
1988 | unsigned int pages_per_huge_page); |
1989 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ |
1990 | |
1991 | #ifdef CONFIG_DEBUG_PAGEALLOC |
1992 | extern unsigned int _debug_guardpage_minorder; |
1993 | |
1994 | static inline unsigned int debug_guardpage_minorder(void) |
1995 | { |
1996 | return _debug_guardpage_minorder; |
1997 | } |
1998 | |
1999 | static inline bool page_is_guard(struct page *page) |
2000 | { |
2001 | return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags); |
2002 | } |
2003 | #else |
2004 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } |
2005 | static inline bool page_is_guard(struct page *page) { return false; } |
2006 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
2007 | |
2008 | #if MAX_NUMNODES > 1 |
2009 | void __init setup_nr_node_ids(void); |
2010 | #else |
2011 | static inline void setup_nr_node_ids(void) {} |
2012 | #endif |
2013 | |
2014 | #endif /* __KERNEL__ */ |
2015 | #endif /* _LINUX_MM_H */ |
2016 |
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