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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 : 63385171 : 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 : 21769960 : 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 : 188765293 : 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 : 73067460 : 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 : 58597 : unsigned long addr = (unsigned long)x;
340 : :
341 [ + + ][ + # ]: 58597 : return addr >= VMALLOC_START && addr < VMALLOC_END;
[ # # ][ # # ]
[ # # ]
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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 [ - + ]: 76746123 : if (unlikely(PageTail(page)))
[ - + - + ]
[ # # ][ + + ]
[ # # ][ # # ]
393 : 168 : 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 : 358157 : atomic_set(&(page)->_mapcount, -1);
405 : : }
406 : :
407 : : static inline int page_mapcount(struct page *page)
408 : : {
409 : 193268573 : return atomic_read(&(page)->_mapcount) + 1;
410 : : }
411 : :
412 : : static inline int page_count(struct page *page)
413 : : {
414 [ # # ]: 541297 : 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 [ - + ]: 72579129 : if (unlikely(PageTail(page)))
[ - + - + ]
[ - + - + ]
[ - + - + ]
[ - + ][ - + ]
[ - + ][ - + ]
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[ # # ][ # # ]
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[ # # ][ - +
# # # # ]
433 [ # # ][ # # ]: 0 : if (likely(__get_page_tail(page)))
[ # # ][ # # ]
[ # # ][ # # ]
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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 : 43579115 : atomic_inc(&page->_count);
441 : : }
442 : :
443 : : static inline struct page *virt_to_head_page(const void *x)
444 : : {
445 : 130627058 : 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 : 0 : 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 : 61955865 : 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 : 11758392 : 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 : 36602013 : 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 : 279 : page[1].lru.next = (void *)dtor;
503 : : }
504 : :
505 : : static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
506 : : {
507 : 189 : return (compound_page_dtor *)page[1].lru.next;
508 : : }
509 : :
510 : : static inline int compound_order(struct page *page)
511 : : {
512 [ # # ][ + - ]: 189 : if (!PageHead(page))
513 : : return 0;
514 : 189 : return (unsigned long)page[1].lru.prev;
515 : : }
516 : :
517 : : static inline void set_compound_order(struct page *page, unsigned long order)
518 : : {
519 : 279 : 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 [ + + ]: 18959242 : 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 : 701955649 : 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 : 122850505 : 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 : 701955649 : 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 : 0 : page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
815 : 0 : 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 : 262143750 : 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 : 0 : 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 [ # # ][ # # ]: 0 : if (unlikely(PageSwapCache(page)))
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # #
# # # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
903 : 0 : return __page_file_mapping(page);
904 : :
905 : 0 : return page->mapping;
906 : : }
907 : :
908 : : static inline int PageAnon(struct page *page)
909 : : {
910 : 334489494 : 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 [ - + ][ - + ]: 8233126 : if (unlikely(PageSwapCache(page)))
[ - + ][ - + ]
[ - + - + ]
[ # # ]
920 : 0 : return page_private(page);
921 : 6093867 : 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 [ # # ][ # # ]: 0 : if (unlikely(PageSwapCache(page)))
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
933 : 0 : return __page_file_index(page);
934 : :
935 : 0 : 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 : 35272375 : 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 : : void shmem_set_file(struct vm_area_struct *vma, struct file *file);
993 : : int shmem_zero_setup(struct vm_area_struct *);
994 : :
995 : : extern int can_do_mlock(void);
996 : : extern int user_shm_lock(size_t, struct user_struct *);
997 : : extern void user_shm_unlock(size_t, struct user_struct *);
998 : :
999 : : /*
1000 : : * Parameter block passed down to zap_pte_range in exceptional cases.
1001 : : */
1002 : : struct zap_details {
1003 : : struct vm_area_struct *nonlinear_vma; /* Check page->index if set */
1004 : : struct address_space *check_mapping; /* Check page->mapping if set */
1005 : : pgoff_t first_index; /* Lowest page->index to unmap */
1006 : : pgoff_t last_index; /* Highest page->index to unmap */
1007 : : };
1008 : :
1009 : : struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
1010 : : pte_t pte);
1011 : :
1012 : : int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1013 : : unsigned long size);
1014 : : void zap_page_range(struct vm_area_struct *vma, unsigned long address,
1015 : : unsigned long size, struct zap_details *);
1016 : : void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
1017 : : unsigned long start, unsigned long end);
1018 : :
1019 : : /**
1020 : : * mm_walk - callbacks for walk_page_range
1021 : : * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
1022 : : * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
1023 : : * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
1024 : : * this handler is required to be able to handle
1025 : : * pmd_trans_huge() pmds. They may simply choose to
1026 : : * split_huge_page() instead of handling it explicitly.
1027 : : * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
1028 : : * @pte_hole: if set, called for each hole at all levels
1029 : : * @hugetlb_entry: if set, called for each hugetlb entry
1030 : : * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
1031 : : * is used.
1032 : : *
1033 : : * (see walk_page_range for more details)
1034 : : */
1035 : : struct mm_walk {
1036 : : int (*pgd_entry)(pgd_t *pgd, unsigned long addr,
1037 : : unsigned long next, struct mm_walk *walk);
1038 : : int (*pud_entry)(pud_t *pud, unsigned long addr,
1039 : : unsigned long next, struct mm_walk *walk);
1040 : : int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
1041 : : unsigned long next, struct mm_walk *walk);
1042 : : int (*pte_entry)(pte_t *pte, unsigned long addr,
1043 : : unsigned long next, struct mm_walk *walk);
1044 : : int (*pte_hole)(unsigned long addr, unsigned long next,
1045 : : struct mm_walk *walk);
1046 : : int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
1047 : : unsigned long addr, unsigned long next,
1048 : : struct mm_walk *walk);
1049 : : struct mm_struct *mm;
1050 : : void *private;
1051 : : };
1052 : :
1053 : : int walk_page_range(unsigned long addr, unsigned long end,
1054 : : struct mm_walk *walk);
1055 : : void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
1056 : : unsigned long end, unsigned long floor, unsigned long ceiling);
1057 : : int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
1058 : : struct vm_area_struct *vma);
1059 : : void unmap_mapping_range(struct address_space *mapping,
1060 : : loff_t const holebegin, loff_t const holelen, int even_cows);
1061 : : int follow_pfn(struct vm_area_struct *vma, unsigned long address,
1062 : : unsigned long *pfn);
1063 : : int follow_phys(struct vm_area_struct *vma, unsigned long address,
1064 : : unsigned int flags, unsigned long *prot, resource_size_t *phys);
1065 : : int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
1066 : : void *buf, int len, int write);
1067 : :
1068 : : static inline void unmap_shared_mapping_range(struct address_space *mapping,
1069 : : loff_t const holebegin, loff_t const holelen)
1070 : : {
1071 : : unmap_mapping_range(mapping, holebegin, holelen, 0);
1072 : : }
1073 : :
1074 : : extern void truncate_pagecache(struct inode *inode, loff_t new);
1075 : : extern void truncate_setsize(struct inode *inode, loff_t newsize);
1076 : : void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
1077 : : int truncate_inode_page(struct address_space *mapping, struct page *page);
1078 : : int generic_error_remove_page(struct address_space *mapping, struct page *page);
1079 : : int invalidate_inode_page(struct page *page);
1080 : :
1081 : : #ifdef CONFIG_MMU
1082 : : extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
1083 : : unsigned long address, unsigned int flags);
1084 : : extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
1085 : : unsigned long address, unsigned int fault_flags);
1086 : : #else
1087 : : static inline int handle_mm_fault(struct mm_struct *mm,
1088 : : struct vm_area_struct *vma, unsigned long address,
1089 : : unsigned int flags)
1090 : : {
1091 : : /* should never happen if there's no MMU */
1092 : : BUG();
1093 : : return VM_FAULT_SIGBUS;
1094 : : }
1095 : : static inline int fixup_user_fault(struct task_struct *tsk,
1096 : : struct mm_struct *mm, unsigned long address,
1097 : : unsigned int fault_flags)
1098 : : {
1099 : : /* should never happen if there's no MMU */
1100 : : BUG();
1101 : : return -EFAULT;
1102 : : }
1103 : : #endif
1104 : :
1105 : : extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
1106 : : extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
1107 : : void *buf, int len, int write);
1108 : :
1109 : : long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1110 : : unsigned long start, unsigned long nr_pages,
1111 : : unsigned int foll_flags, struct page **pages,
1112 : : struct vm_area_struct **vmas, int *nonblocking);
1113 : : long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1114 : : unsigned long start, unsigned long nr_pages,
1115 : : int write, int force, struct page **pages,
1116 : : struct vm_area_struct **vmas);
1117 : : int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1118 : : struct page **pages);
1119 : : struct kvec;
1120 : : int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
1121 : : struct page **pages);
1122 : : int get_kernel_page(unsigned long start, int write, struct page **pages);
1123 : : struct page *get_dump_page(unsigned long addr);
1124 : :
1125 : : extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1126 : : extern void do_invalidatepage(struct page *page, unsigned int offset,
1127 : : unsigned int length);
1128 : :
1129 : : int __set_page_dirty_nobuffers(struct page *page);
1130 : : int __set_page_dirty_no_writeback(struct page *page);
1131 : : int redirty_page_for_writepage(struct writeback_control *wbc,
1132 : : struct page *page);
1133 : : void account_page_dirtied(struct page *page, struct address_space *mapping);
1134 : : void account_page_writeback(struct page *page);
1135 : : int set_page_dirty(struct page *page);
1136 : : int set_page_dirty_lock(struct page *page);
1137 : : int clear_page_dirty_for_io(struct page *page);
1138 : :
1139 : : /* Is the vma a continuation of the stack vma above it? */
1140 : : static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1141 : : {
1142 [ + - ][ + + ]: 156 : return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
[ - + ]
1143 : : }
1144 : :
1145 : : static inline int stack_guard_page_start(struct vm_area_struct *vma,
1146 : : unsigned long addr)
1147 : : {
1148 [ + + ]: 875491 : return (vma->vm_flags & VM_GROWSDOWN) &&
1149 [ + + ][ + + ]: 933332 : (vma->vm_start == addr) &&
1150 : 156 : !vma_growsdown(vma->vm_prev, addr);
1151 : : }
1152 : :
1153 : : /* Is the vma a continuation of the stack vma below it? */
1154 : : static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
1155 : : {
1156 : : return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
1157 : : }
1158 : :
1159 : : static inline int stack_guard_page_end(struct vm_area_struct *vma,
1160 : : unsigned long addr)
1161 : : {
1162 : : return (vma->vm_flags & VM_GROWSUP) &&
1163 : : (vma->vm_end == addr) &&
1164 : : !vma_growsup(vma->vm_next, addr);
1165 : : }
1166 : :
1167 : : extern pid_t
1168 : : vm_is_stack(struct task_struct *task, struct vm_area_struct *vma, int in_group);
1169 : :
1170 : : extern unsigned long move_page_tables(struct vm_area_struct *vma,
1171 : : unsigned long old_addr, struct vm_area_struct *new_vma,
1172 : : unsigned long new_addr, unsigned long len,
1173 : : bool need_rmap_locks);
1174 : : extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
1175 : : unsigned long end, pgprot_t newprot,
1176 : : int dirty_accountable, int prot_numa);
1177 : : extern int mprotect_fixup(struct vm_area_struct *vma,
1178 : : struct vm_area_struct **pprev, unsigned long start,
1179 : : unsigned long end, unsigned long newflags);
1180 : :
1181 : : /*
1182 : : * doesn't attempt to fault and will return short.
1183 : : */
1184 : : int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1185 : : struct page **pages);
1186 : : /*
1187 : : * per-process(per-mm_struct) statistics.
1188 : : */
1189 : : static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1190 : : {
1191 : : long val = atomic_long_read(&mm->rss_stat.count[member]);
1192 : :
1193 : : #ifdef SPLIT_RSS_COUNTING
1194 : : /*
1195 : : * counter is updated in asynchronous manner and may go to minus.
1196 : : * But it's never be expected number for users.
1197 : : */
1198 [ + + ][ - + ]: 3658900 : if (val < 0)
[ + + ][ - + ]
[ # # ][ + + ]
[ - + ][ + + ]
[ - + ][ + + ]
[ + + ][ - + ]
[ - + ]
1199 : : val = 0;
1200 : : #endif
1201 : 7313498 : return (unsigned long)val;
1202 : : }
1203 : :
1204 : : static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1205 : : {
1206 : 35535290 : atomic_long_add(value, &mm->rss_stat.count[member]);
1207 : : }
1208 : :
1209 : : static inline void inc_mm_counter(struct mm_struct *mm, int member)
1210 : : {
1211 : 0 : atomic_long_inc(&mm->rss_stat.count[member]);
1212 : : }
1213 : :
1214 : : static inline void dec_mm_counter(struct mm_struct *mm, int member)
1215 : : {
1216 : 5136 : atomic_long_dec(&mm->rss_stat.count[member]);
1217 : : }
1218 : :
1219 : : static inline unsigned long get_mm_rss(struct mm_struct *mm)
1220 : : {
1221 : 3654532 : return get_mm_counter(mm, MM_FILEPAGES) +
1222 : : get_mm_counter(mm, MM_ANONPAGES);
1223 : : }
1224 : :
1225 : : static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1226 : : {
1227 : 2526448 : return max(mm->hiwater_rss, get_mm_rss(mm));
1228 : : }
1229 : :
1230 : : static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1231 : : {
1232 : : return max(mm->hiwater_vm, mm->total_vm);
1233 : : }
1234 : :
1235 : : static inline void update_hiwater_rss(struct mm_struct *mm)
1236 : : {
1237 : : unsigned long _rss = get_mm_rss(mm);
1238 : :
1239 [ + + ][ + + ]: 1248585 : if ((mm)->hiwater_rss < _rss)
1240 : 529213 : (mm)->hiwater_rss = _rss;
1241 : : }
1242 : :
1243 : : static inline void update_hiwater_vm(struct mm_struct *mm)
1244 : : {
1245 [ + + ]: 1179116 : if (mm->hiwater_vm < mm->total_vm)
1246 : 1179116 : mm->hiwater_vm = mm->total_vm;
1247 : : }
1248 : :
1249 : : static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1250 : : struct mm_struct *mm)
1251 : : {
1252 : : unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1253 : :
1254 [ + + ]: 1263224 : if (*maxrss < hiwater_rss)
1255 : 1192708 : *maxrss = hiwater_rss;
1256 : : }
1257 : :
1258 : : #if defined(SPLIT_RSS_COUNTING)
1259 : : void sync_mm_rss(struct mm_struct *mm);
1260 : : #else
1261 : : static inline void sync_mm_rss(struct mm_struct *mm)
1262 : : {
1263 : : }
1264 : : #endif
1265 : :
1266 : : int vma_wants_writenotify(struct vm_area_struct *vma);
1267 : :
1268 : : extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1269 : : spinlock_t **ptl);
1270 : : static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1271 : : spinlock_t **ptl)
1272 : : {
1273 : : pte_t *ptep;
1274 : 1119 : __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1275 : : return ptep;
1276 : : }
1277 : :
1278 : : #ifdef __PAGETABLE_PUD_FOLDED
1279 : : static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1280 : : unsigned long address)
1281 : : {
1282 : : return 0;
1283 : : }
1284 : : #else
1285 : : int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1286 : : #endif
1287 : :
1288 : : #ifdef __PAGETABLE_PMD_FOLDED
1289 : : static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1290 : : unsigned long address)
1291 : : {
1292 : : return 0;
1293 : : }
1294 : : #else
1295 : : int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1296 : : #endif
1297 : :
1298 : : int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1299 : : pmd_t *pmd, unsigned long address);
1300 : : int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1301 : :
1302 : : /*
1303 : : * The following ifdef needed to get the 4level-fixup.h header to work.
1304 : : * Remove it when 4level-fixup.h has been removed.
1305 : : */
1306 : : #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1307 : : static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1308 : : {
1309 : : return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1310 : : NULL: pud_offset(pgd, address);
1311 : : }
1312 : :
1313 : : static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1314 : : {
1315 : : return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1316 : : NULL: pmd_offset(pud, address);
1317 : : }
1318 : : #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1319 : :
1320 : : #if USE_SPLIT_PTE_PTLOCKS
1321 : : #if ALLOC_SPLIT_PTLOCKS
1322 : : extern bool ptlock_alloc(struct page *page);
1323 : : extern void ptlock_free(struct page *page);
1324 : :
1325 : : static inline spinlock_t *ptlock_ptr(struct page *page)
1326 : : {
1327 : : return page->ptl;
1328 : : }
1329 : : #else /* ALLOC_SPLIT_PTLOCKS */
1330 : : static inline bool ptlock_alloc(struct page *page)
1331 : : {
1332 : : return true;
1333 : : }
1334 : :
1335 : : static inline void ptlock_free(struct page *page)
1336 : : {
1337 : : }
1338 : :
1339 : : static inline spinlock_t *ptlock_ptr(struct page *page)
1340 : : {
1341 : : return &page->ptl;
1342 : : }
1343 : : #endif /* ALLOC_SPLIT_PTLOCKS */
1344 : :
1345 : : static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1346 : : {
1347 : 152317751 : return ptlock_ptr(pmd_page(*pmd));
1348 : : }
1349 : :
1350 : : static inline bool ptlock_init(struct page *page)
1351 : : {
1352 : : /*
1353 : : * prep_new_page() initialize page->private (and therefore page->ptl)
1354 : : * with 0. Make sure nobody took it in use in between.
1355 : : *
1356 : : * It can happen if arch try to use slab for page table allocation:
1357 : : * slab code uses page->slab_cache and page->first_page (for tail
1358 : : * pages), which share storage with page->ptl.
1359 : : */
1360 : : VM_BUG_ON(*(unsigned long *)&page->ptl);
1361 : : if (!ptlock_alloc(page))
1362 : : return false;
1363 : 4992034 : spin_lock_init(ptlock_ptr(page));
1364 : : return true;
1365 : : }
1366 : :
1367 : : /* Reset page->mapping so free_pages_check won't complain. */
1368 : : static inline void pte_lock_deinit(struct page *page)
1369 : : {
1370 : 3796982 : page->mapping = NULL;
1371 : : ptlock_free(page);
1372 : : }
1373 : :
1374 : : #else /* !USE_SPLIT_PTE_PTLOCKS */
1375 : : /*
1376 : : * We use mm->page_table_lock to guard all pagetable pages of the mm.
1377 : : */
1378 : : static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
1379 : : {
1380 : : return &mm->page_table_lock;
1381 : : }
1382 : : static inline bool ptlock_init(struct page *page) { return true; }
1383 : : static inline void pte_lock_deinit(struct page *page) {}
1384 : : #endif /* USE_SPLIT_PTE_PTLOCKS */
1385 : :
1386 : : static inline bool pgtable_page_ctor(struct page *page)
1387 : : {
1388 : 4992136 : inc_zone_page_state(page, NR_PAGETABLE);
1389 : : return ptlock_init(page);
1390 : : }
1391 : :
1392 : : static inline void pgtable_page_dtor(struct page *page)
1393 : : {
1394 : : pte_lock_deinit(page);
1395 : 3796982 : dec_zone_page_state(page, NR_PAGETABLE);
1396 : : }
1397 : :
1398 : : #define pte_offset_map_lock(mm, pmd, address, ptlp) \
1399 : : ({ \
1400 : : spinlock_t *__ptl = pte_lockptr(mm, pmd); \
1401 : : pte_t *__pte = pte_offset_map(pmd, address); \
1402 : : *(ptlp) = __ptl; \
1403 : : spin_lock(__ptl); \
1404 : : __pte; \
1405 : : })
1406 : :
1407 : : #define pte_unmap_unlock(pte, ptl) do { \
1408 : : spin_unlock(ptl); \
1409 : : pte_unmap(pte); \
1410 : : } while (0)
1411 : :
1412 : : #define pte_alloc_map(mm, vma, pmd, address) \
1413 : : ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
1414 : : pmd, address))? \
1415 : : NULL: pte_offset_map(pmd, address))
1416 : :
1417 : : #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
1418 : : ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
1419 : : pmd, address))? \
1420 : : NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1421 : :
1422 : : #define pte_alloc_kernel(pmd, address) \
1423 : : ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1424 : : NULL: pte_offset_kernel(pmd, address))
1425 : :
1426 : : #if USE_SPLIT_PMD_PTLOCKS
1427 : :
1428 : : static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1429 : : {
1430 : : return ptlock_ptr(virt_to_page(pmd));
1431 : : }
1432 : :
1433 : : static inline bool pgtable_pmd_page_ctor(struct page *page)
1434 : : {
1435 : : #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1436 : : page->pmd_huge_pte = NULL;
1437 : : #endif
1438 : : return ptlock_init(page);
1439 : : }
1440 : :
1441 : : static inline void pgtable_pmd_page_dtor(struct page *page)
1442 : : {
1443 : : #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1444 : : VM_BUG_ON(page->pmd_huge_pte);
1445 : : #endif
1446 : : ptlock_free(page);
1447 : : }
1448 : :
1449 : : #define pmd_huge_pte(mm, pmd) (virt_to_page(pmd)->pmd_huge_pte)
1450 : :
1451 : : #else
1452 : :
1453 : : static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
1454 : : {
1455 : : return &mm->page_table_lock;
1456 : : }
1457 : :
1458 : : static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
1459 : : static inline void pgtable_pmd_page_dtor(struct page *page) {}
1460 : :
1461 : : #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
1462 : :
1463 : : #endif
1464 : :
1465 : : static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
1466 : : {
1467 : 4991998 : spinlock_t *ptl = pmd_lockptr(mm, pmd);
1468 : : spin_lock(ptl);
1469 : : return ptl;
1470 : : }
1471 : :
1472 : : extern void free_area_init(unsigned long * zones_size);
1473 : : extern void free_area_init_node(int nid, unsigned long * zones_size,
1474 : : unsigned long zone_start_pfn, unsigned long *zholes_size);
1475 : : extern void free_initmem(void);
1476 : :
1477 : : /*
1478 : : * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
1479 : : * into the buddy system. The freed pages will be poisoned with pattern
1480 : : * "poison" if it's within range [0, UCHAR_MAX].
1481 : : * Return pages freed into the buddy system.
1482 : : */
1483 : : extern unsigned long free_reserved_area(void *start, void *end,
1484 : : int poison, char *s);
1485 : :
1486 : : #ifdef CONFIG_HIGHMEM
1487 : : /*
1488 : : * Free a highmem page into the buddy system, adjusting totalhigh_pages
1489 : : * and totalram_pages.
1490 : : */
1491 : : extern void free_highmem_page(struct page *page);
1492 : : #endif
1493 : :
1494 : : extern void adjust_managed_page_count(struct page *page, long count);
1495 : : extern void mem_init_print_info(const char *str);
1496 : :
1497 : : /* Free the reserved page into the buddy system, so it gets managed. */
1498 : : static inline void __free_reserved_page(struct page *page)
1499 : : {
1500 : : ClearPageReserved(page);
1501 : : init_page_count(page);
1502 : 0 : __free_page(page);
1503 : : }
1504 : :
1505 : : static inline void free_reserved_page(struct page *page)
1506 : : {
1507 : : __free_reserved_page(page);
1508 : 0 : adjust_managed_page_count(page, 1);
1509 : : }
1510 : :
1511 : : static inline void mark_page_reserved(struct page *page)
1512 : : {
1513 : : SetPageReserved(page);
1514 : : adjust_managed_page_count(page, -1);
1515 : : }
1516 : :
1517 : : /*
1518 : : * Default method to free all the __init memory into the buddy system.
1519 : : * The freed pages will be poisoned with pattern "poison" if it's within
1520 : : * range [0, UCHAR_MAX].
1521 : : * Return pages freed into the buddy system.
1522 : : */
1523 : : static inline unsigned long free_initmem_default(int poison)
1524 : : {
1525 : : extern char __init_begin[], __init_end[];
1526 : :
1527 : : return free_reserved_area(&__init_begin, &__init_end,
1528 : : poison, "unused kernel");
1529 : : }
1530 : :
1531 : : static inline unsigned long get_num_physpages(void)
1532 : : {
1533 : : int nid;
1534 : : unsigned long phys_pages = 0;
1535 : :
1536 [ # # ]: 0 : for_each_online_node(nid)
1537 : 0 : phys_pages += node_present_pages(nid);
1538 : :
1539 : : return phys_pages;
1540 : : }
1541 : :
1542 : : #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1543 : : /*
1544 : : * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1545 : : * zones, allocate the backing mem_map and account for memory holes in a more
1546 : : * architecture independent manner. This is a substitute for creating the
1547 : : * zone_sizes[] and zholes_size[] arrays and passing them to
1548 : : * free_area_init_node()
1549 : : *
1550 : : * An architecture is expected to register range of page frames backed by
1551 : : * physical memory with memblock_add[_node]() before calling
1552 : : * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1553 : : * usage, an architecture is expected to do something like
1554 : : *
1555 : : * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1556 : : * max_highmem_pfn};
1557 : : * for_each_valid_physical_page_range()
1558 : : * memblock_add_node(base, size, nid)
1559 : : * free_area_init_nodes(max_zone_pfns);
1560 : : *
1561 : : * free_bootmem_with_active_regions() calls free_bootmem_node() for each
1562 : : * registered physical page range. Similarly
1563 : : * sparse_memory_present_with_active_regions() calls memory_present() for
1564 : : * each range when SPARSEMEM is enabled.
1565 : : *
1566 : : * See mm/page_alloc.c for more information on each function exposed by
1567 : : * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1568 : : */
1569 : : extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1570 : : unsigned long node_map_pfn_alignment(void);
1571 : : unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1572 : : unsigned long end_pfn);
1573 : : extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1574 : : unsigned long end_pfn);
1575 : : extern void get_pfn_range_for_nid(unsigned int nid,
1576 : : unsigned long *start_pfn, unsigned long *end_pfn);
1577 : : extern unsigned long find_min_pfn_with_active_regions(void);
1578 : : extern void free_bootmem_with_active_regions(int nid,
1579 : : unsigned long max_low_pfn);
1580 : : extern void sparse_memory_present_with_active_regions(int nid);
1581 : :
1582 : : #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1583 : :
1584 : : #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1585 : : !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1586 : : static inline int __early_pfn_to_nid(unsigned long pfn)
1587 : : {
1588 : : return 0;
1589 : : }
1590 : : #else
1591 : : /* please see mm/page_alloc.c */
1592 : : extern int __meminit early_pfn_to_nid(unsigned long pfn);
1593 : : #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
1594 : : /* there is a per-arch backend function. */
1595 : : extern int __meminit __early_pfn_to_nid(unsigned long pfn);
1596 : : #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
1597 : : #endif
1598 : :
1599 : : extern void set_dma_reserve(unsigned long new_dma_reserve);
1600 : : extern void memmap_init_zone(unsigned long, int, unsigned long,
1601 : : unsigned long, enum memmap_context);
1602 : : extern void setup_per_zone_wmarks(void);
1603 : : extern int __meminit init_per_zone_wmark_min(void);
1604 : : extern void mem_init(void);
1605 : : extern void __init mmap_init(void);
1606 : : extern void show_mem(unsigned int flags);
1607 : : extern void si_meminfo(struct sysinfo * val);
1608 : : extern void si_meminfo_node(struct sysinfo *val, int nid);
1609 : :
1610 : : extern __printf(3, 4)
1611 : : void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
1612 : :
1613 : : extern void setup_per_cpu_pageset(void);
1614 : :
1615 : : extern void zone_pcp_update(struct zone *zone);
1616 : : extern void zone_pcp_reset(struct zone *zone);
1617 : :
1618 : : /* page_alloc.c */
1619 : : extern int min_free_kbytes;
1620 : :
1621 : : /* nommu.c */
1622 : : extern atomic_long_t mmap_pages_allocated;
1623 : : extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1624 : :
1625 : : /* interval_tree.c */
1626 : : void vma_interval_tree_insert(struct vm_area_struct *node,
1627 : : struct rb_root *root);
1628 : : void vma_interval_tree_insert_after(struct vm_area_struct *node,
1629 : : struct vm_area_struct *prev,
1630 : : struct rb_root *root);
1631 : : void vma_interval_tree_remove(struct vm_area_struct *node,
1632 : : struct rb_root *root);
1633 : : struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
1634 : : unsigned long start, unsigned long last);
1635 : : struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
1636 : : unsigned long start, unsigned long last);
1637 : :
1638 : : #define vma_interval_tree_foreach(vma, root, start, last) \
1639 : : for (vma = vma_interval_tree_iter_first(root, start, last); \
1640 : : vma; vma = vma_interval_tree_iter_next(vma, start, last))
1641 : :
1642 : : static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
1643 : : struct list_head *list)
1644 : : {
1645 : 1 : list_add_tail(&vma->shared.nonlinear, list);
1646 : : }
1647 : :
1648 : : void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
1649 : : struct rb_root *root);
1650 : : void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
1651 : : struct rb_root *root);
1652 : : struct anon_vma_chain *anon_vma_interval_tree_iter_first(
1653 : : struct rb_root *root, unsigned long start, unsigned long last);
1654 : : struct anon_vma_chain *anon_vma_interval_tree_iter_next(
1655 : : struct anon_vma_chain *node, unsigned long start, unsigned long last);
1656 : : #ifdef CONFIG_DEBUG_VM_RB
1657 : : void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
1658 : : #endif
1659 : :
1660 : : #define anon_vma_interval_tree_foreach(avc, root, start, last) \
1661 : : for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
1662 : : avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
1663 : :
1664 : : /* mmap.c */
1665 : : extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1666 : : extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1667 : : unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1668 : : extern struct vm_area_struct *vma_merge(struct mm_struct *,
1669 : : struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1670 : : unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1671 : : struct mempolicy *, const char __user *);
1672 : : extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1673 : : extern int split_vma(struct mm_struct *,
1674 : : struct vm_area_struct *, unsigned long addr, int new_below);
1675 : : extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1676 : : extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1677 : : struct rb_node **, struct rb_node *);
1678 : : extern void unlink_file_vma(struct vm_area_struct *);
1679 : : extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1680 : : unsigned long addr, unsigned long len, pgoff_t pgoff,
1681 : : bool *need_rmap_locks);
1682 : : extern void exit_mmap(struct mm_struct *);
1683 : :
1684 : : extern int mm_take_all_locks(struct mm_struct *mm);
1685 : : extern void mm_drop_all_locks(struct mm_struct *mm);
1686 : :
1687 : : extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1688 : : extern struct file *get_mm_exe_file(struct mm_struct *mm);
1689 : :
1690 : : extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1691 : : extern int install_special_mapping(struct mm_struct *mm,
1692 : : unsigned long addr, unsigned long len,
1693 : : unsigned long flags, struct page **pages);
1694 : :
1695 : : extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1696 : :
1697 : : extern unsigned long mmap_region(struct file *file, unsigned long addr,
1698 : : unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
1699 : : extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1700 : : unsigned long len, unsigned long prot, unsigned long flags,
1701 : : unsigned long pgoff, unsigned long *populate);
1702 : : extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1703 : :
1704 : : #ifdef CONFIG_MMU
1705 : : extern int __mm_populate(unsigned long addr, unsigned long len,
1706 : : int ignore_errors);
1707 : : static inline void mm_populate(unsigned long addr, unsigned long len)
1708 : : {
1709 : : /* Ignore errors */
1710 : 469834 : (void) __mm_populate(addr, len, 1);
1711 : : }
1712 : : #else
1713 : : static inline void mm_populate(unsigned long addr, unsigned long len) {}
1714 : : #endif
1715 : :
1716 : : /* These take the mm semaphore themselves */
1717 : : extern unsigned long vm_brk(unsigned long, unsigned long);
1718 : : extern int vm_munmap(unsigned long, size_t);
1719 : : extern unsigned long vm_mmap(struct file *, unsigned long,
1720 : : unsigned long, unsigned long,
1721 : : unsigned long, unsigned long);
1722 : :
1723 : : struct vm_unmapped_area_info {
1724 : : #define VM_UNMAPPED_AREA_TOPDOWN 1
1725 : : unsigned long flags;
1726 : : unsigned long length;
1727 : : unsigned long low_limit;
1728 : : unsigned long high_limit;
1729 : : unsigned long align_mask;
1730 : : unsigned long align_offset;
1731 : : };
1732 : :
1733 : : extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
1734 : : extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
1735 : :
1736 : : /*
1737 : : * Search for an unmapped address range.
1738 : : *
1739 : : * We are looking for a range that:
1740 : : * - does not intersect with any VMA;
1741 : : * - is contained within the [low_limit, high_limit) interval;
1742 : : * - is at least the desired size.
1743 : : * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
1744 : : */
1745 : : static inline unsigned long
1746 : : vm_unmapped_area(struct vm_unmapped_area_info *info)
1747 : : {
1748 : : if (!(info->flags & VM_UNMAPPED_AREA_TOPDOWN))
1749 : : return unmapped_area(info);
1750 : : else
1751 : : return unmapped_area_topdown(info);
1752 : : }
1753 : :
1754 : : /* truncate.c */
1755 : : extern void truncate_inode_pages(struct address_space *, loff_t);
1756 : : extern void truncate_inode_pages_range(struct address_space *,
1757 : : loff_t lstart, loff_t lend);
1758 : :
1759 : : /* generic vm_area_ops exported for stackable file systems */
1760 : : extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1761 : : extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1762 : :
1763 : : /* mm/page-writeback.c */
1764 : : int write_one_page(struct page *page, int wait);
1765 : : void task_dirty_inc(struct task_struct *tsk);
1766 : :
1767 : : /* readahead.c */
1768 : : #define VM_MAX_READAHEAD 128 /* kbytes */
1769 : : #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
1770 : :
1771 : : int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1772 : : pgoff_t offset, unsigned long nr_to_read);
1773 : :
1774 : : void page_cache_sync_readahead(struct address_space *mapping,
1775 : : struct file_ra_state *ra,
1776 : : struct file *filp,
1777 : : pgoff_t offset,
1778 : : unsigned long size);
1779 : :
1780 : : void page_cache_async_readahead(struct address_space *mapping,
1781 : : struct file_ra_state *ra,
1782 : : struct file *filp,
1783 : : struct page *pg,
1784 : : pgoff_t offset,
1785 : : unsigned long size);
1786 : :
1787 : : unsigned long max_sane_readahead(unsigned long nr);
1788 : : unsigned long ra_submit(struct file_ra_state *ra,
1789 : : struct address_space *mapping,
1790 : : struct file *filp);
1791 : :
1792 : : /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1793 : : extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1794 : :
1795 : : /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1796 : : extern int expand_downwards(struct vm_area_struct *vma,
1797 : : unsigned long address);
1798 : : #if VM_GROWSUP
1799 : : extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1800 : : #else
1801 : : #define expand_upwards(vma, address) do { } while (0)
1802 : : #endif
1803 : :
1804 : : /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1805 : : extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1806 : : extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1807 : : struct vm_area_struct **pprev);
1808 : :
1809 : : /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1810 : : NULL if none. Assume start_addr < end_addr. */
1811 : : static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1812 : : {
1813 : 149017 : struct vm_area_struct * vma = find_vma(mm,start_addr);
1814 : :
1815 [ + - ][ + - ]: 149017 : if (vma && end_addr <= vma->vm_start)
[ + - ][ + + ]
1816 : : vma = NULL;
1817 : : return vma;
1818 : : }
1819 : :
1820 : : static inline unsigned long vma_pages(struct vm_area_struct *vma)
1821 : : {
1822 : 28032987 : return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
1823 : : }
1824 : :
1825 : : /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
1826 : : static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
1827 : : unsigned long vm_start, unsigned long vm_end)
1828 : : {
1829 : : struct vm_area_struct *vma = find_vma(mm, vm_start);
1830 : :
1831 : : if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
1832 : : vma = NULL;
1833 : :
1834 : : return vma;
1835 : : }
1836 : :
1837 : : #ifdef CONFIG_MMU
1838 : : pgprot_t vm_get_page_prot(unsigned long vm_flags);
1839 : : #else
1840 : : static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
1841 : : {
1842 : : return __pgprot(0);
1843 : : }
1844 : : #endif
1845 : :
1846 : : #ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
1847 : : unsigned long change_prot_numa(struct vm_area_struct *vma,
1848 : : unsigned long start, unsigned long end);
1849 : : #endif
1850 : :
1851 : : struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
1852 : : int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
1853 : : unsigned long pfn, unsigned long size, pgprot_t);
1854 : : int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
1855 : : int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
1856 : : unsigned long pfn);
1857 : : int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
1858 : : unsigned long pfn);
1859 : : int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
1860 : :
1861 : :
1862 : : struct page *follow_page_mask(struct vm_area_struct *vma,
1863 : : unsigned long address, unsigned int foll_flags,
1864 : : unsigned int *page_mask);
1865 : :
1866 : : static inline struct page *follow_page(struct vm_area_struct *vma,
1867 : : unsigned long address, unsigned int foll_flags)
1868 : : {
1869 : : unsigned int unused_page_mask;
1870 : : return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
1871 : : }
1872 : :
1873 : : #define FOLL_WRITE 0x01 /* check pte is writable */
1874 : : #define FOLL_TOUCH 0x02 /* mark page accessed */
1875 : : #define FOLL_GET 0x04 /* do get_page on page */
1876 : : #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
1877 : : #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
1878 : : #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
1879 : : * and return without waiting upon it */
1880 : : #define FOLL_MLOCK 0x40 /* mark page as mlocked */
1881 : : #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
1882 : : #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
1883 : : #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
1884 : : #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
1885 : :
1886 : : typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
1887 : : void *data);
1888 : : extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
1889 : : unsigned long size, pte_fn_t fn, void *data);
1890 : :
1891 : : #ifdef CONFIG_PROC_FS
1892 : : void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
1893 : : #else
1894 : : static inline void vm_stat_account(struct mm_struct *mm,
1895 : : unsigned long flags, struct file *file, long pages)
1896 : : {
1897 : : mm->total_vm += pages;
1898 : : }
1899 : : #endif /* CONFIG_PROC_FS */
1900 : :
1901 : : #ifdef CONFIG_DEBUG_PAGEALLOC
1902 : : extern void kernel_map_pages(struct page *page, int numpages, int enable);
1903 : : #ifdef CONFIG_HIBERNATION
1904 : : extern bool kernel_page_present(struct page *page);
1905 : : #endif /* CONFIG_HIBERNATION */
1906 : : #else
1907 : : static inline void
1908 : : kernel_map_pages(struct page *page, int numpages, int enable) {}
1909 : : #ifdef CONFIG_HIBERNATION
1910 : : static inline bool kernel_page_present(struct page *page) { return true; }
1911 : : #endif /* CONFIG_HIBERNATION */
1912 : : #endif
1913 : :
1914 : : extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
1915 : : #ifdef __HAVE_ARCH_GATE_AREA
1916 : : int in_gate_area_no_mm(unsigned long addr);
1917 : : int in_gate_area(struct mm_struct *mm, unsigned long addr);
1918 : : #else
1919 : : int in_gate_area_no_mm(unsigned long addr);
1920 : : #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
1921 : : #endif /* __HAVE_ARCH_GATE_AREA */
1922 : :
1923 : : #ifdef CONFIG_SYSCTL
1924 : : extern int sysctl_drop_caches;
1925 : : int drop_caches_sysctl_handler(struct ctl_table *, int,
1926 : : void __user *, size_t *, loff_t *);
1927 : : #endif
1928 : :
1929 : : unsigned long shrink_slab(struct shrink_control *shrink,
1930 : : unsigned long nr_pages_scanned,
1931 : : unsigned long lru_pages);
1932 : :
1933 : : #ifndef CONFIG_MMU
1934 : : #define randomize_va_space 0
1935 : : #else
1936 : : extern int randomize_va_space;
1937 : : #endif
1938 : :
1939 : : const char * arch_vma_name(struct vm_area_struct *vma);
1940 : : void print_vma_addr(char *prefix, unsigned long rip);
1941 : :
1942 : : void sparse_mem_maps_populate_node(struct page **map_map,
1943 : : unsigned long pnum_begin,
1944 : : unsigned long pnum_end,
1945 : : unsigned long map_count,
1946 : : int nodeid);
1947 : :
1948 : : struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
1949 : : pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
1950 : : pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
1951 : : pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
1952 : : pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
1953 : : void *vmemmap_alloc_block(unsigned long size, int node);
1954 : : void *vmemmap_alloc_block_buf(unsigned long size, int node);
1955 : : void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
1956 : : int vmemmap_populate_basepages(unsigned long start, unsigned long end,
1957 : : int node);
1958 : : int vmemmap_populate(unsigned long start, unsigned long end, int node);
1959 : : void vmemmap_populate_print_last(void);
1960 : : #ifdef CONFIG_MEMORY_HOTPLUG
1961 : : void vmemmap_free(unsigned long start, unsigned long end);
1962 : : #endif
1963 : : void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
1964 : : unsigned long size);
1965 : :
1966 : : enum mf_flags {
1967 : : MF_COUNT_INCREASED = 1 << 0,
1968 : : MF_ACTION_REQUIRED = 1 << 1,
1969 : : MF_MUST_KILL = 1 << 2,
1970 : : MF_SOFT_OFFLINE = 1 << 3,
1971 : : };
1972 : : extern int memory_failure(unsigned long pfn, int trapno, int flags);
1973 : : extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
1974 : : extern int unpoison_memory(unsigned long pfn);
1975 : : extern int sysctl_memory_failure_early_kill;
1976 : : extern int sysctl_memory_failure_recovery;
1977 : : extern void shake_page(struct page *p, int access);
1978 : : extern atomic_long_t num_poisoned_pages;
1979 : : extern int soft_offline_page(struct page *page, int flags);
1980 : :
1981 : : extern void dump_page(struct page *page);
1982 : :
1983 : : #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
1984 : : extern void clear_huge_page(struct page *page,
1985 : : unsigned long addr,
1986 : : unsigned int pages_per_huge_page);
1987 : : extern void copy_user_huge_page(struct page *dst, struct page *src,
1988 : : unsigned long addr, struct vm_area_struct *vma,
1989 : : unsigned int pages_per_huge_page);
1990 : : #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
1991 : :
1992 : : #ifdef CONFIG_DEBUG_PAGEALLOC
1993 : : extern unsigned int _debug_guardpage_minorder;
1994 : :
1995 : : static inline unsigned int debug_guardpage_minorder(void)
1996 : : {
1997 : : return _debug_guardpage_minorder;
1998 : : }
1999 : :
2000 : : static inline bool page_is_guard(struct page *page)
2001 : : {
2002 : : return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags);
2003 : : }
2004 : : #else
2005 : : static inline unsigned int debug_guardpage_minorder(void) { return 0; }
2006 : : static inline bool page_is_guard(struct page *page) { return false; }
2007 : : #endif /* CONFIG_DEBUG_PAGEALLOC */
2008 : :
2009 : : #if MAX_NUMNODES > 1
2010 : : void __init setup_nr_node_ids(void);
2011 : : #else
2012 : : static inline void setup_nr_node_ids(void) {}
2013 : : #endif
2014 : :
2015 : : #endif /* __KERNEL__ */
2016 : : #endif /* _LINUX_MM_H */
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