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TOMOYO Linux Cross Reference
Linux/include/linux/mm.h

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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/list.h>
 10 #include <linux/mmzone.h>
 11 #include <linux/rbtree.h>
 12 #include <linux/prio_tree.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 file_ra_state;
 24 struct user_struct;
 25 struct writeback_control;
 26 
 27 #ifndef CONFIG_DISCONTIGMEM          /* Don't use mapnrs, do it properly */
 28 extern unsigned long max_mapnr;
 29 #endif
 30 
 31 extern unsigned long num_physpages;
 32 extern unsigned long totalram_pages;
 33 extern void * high_memory;
 34 extern int page_cluster;
 35 
 36 #ifdef CONFIG_SYSCTL
 37 extern int sysctl_legacy_va_layout;
 38 #else
 39 #define sysctl_legacy_va_layout 0
 40 #endif
 41 
 42 #include <asm/page.h>
 43 #include <asm/pgtable.h>
 44 #include <asm/processor.h>
 45 
 46 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
 47 
 48 /* to align the pointer to the (next) page boundary */
 49 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
 50 
 51 /*
 52  * Linux kernel virtual memory manager primitives.
 53  * The idea being to have a "virtual" mm in the same way
 54  * we have a virtual fs - giving a cleaner interface to the
 55  * mm details, and allowing different kinds of memory mappings
 56  * (from shared memory to executable loading to arbitrary
 57  * mmap() functions).
 58  */
 59 
 60 extern struct kmem_cache *vm_area_cachep;
 61 
 62 #ifndef CONFIG_MMU
 63 extern struct rb_root nommu_region_tree;
 64 extern struct rw_semaphore nommu_region_sem;
 65 
 66 extern unsigned int kobjsize(const void *objp);
 67 #endif
 68 
 69 /*
 70  * vm_flags in vm_area_struct, see mm_types.h.
 71  */
 72 #define VM_READ         0x00000001      /* currently active flags */
 73 #define VM_WRITE        0x00000002
 74 #define VM_EXEC         0x00000004
 75 #define VM_SHARED       0x00000008
 76 
 77 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
 78 #define VM_MAYREAD      0x00000010      /* limits for mprotect() etc */
 79 #define VM_MAYWRITE     0x00000020
 80 #define VM_MAYEXEC      0x00000040
 81 #define VM_MAYSHARE     0x00000080
 82 
 83 #define VM_GROWSDOWN    0x00000100      /* general info on the segment */
 84 #if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64)
 85 #define VM_GROWSUP      0x00000200
 86 #else
 87 #define VM_GROWSUP      0x00000000
 88 #define VM_NOHUGEPAGE   0x00000200      /* MADV_NOHUGEPAGE marked this vma */
 89 #endif
 90 #define VM_PFNMAP       0x00000400      /* Page-ranges managed without "struct page", just pure PFN */
 91 #define VM_DENYWRITE    0x00000800      /* ETXTBSY on write attempts.. */
 92 
 93 #define VM_EXECUTABLE   0x00001000
 94 #define VM_LOCKED       0x00002000
 95 #define VM_IO           0x00004000      /* Memory mapped I/O or similar */
 96 
 97                                         /* Used by sys_madvise() */
 98 #define VM_SEQ_READ     0x00008000      /* App will access data sequentially */
 99 #define VM_RAND_READ    0x00010000      /* App will not benefit from clustered reads */
100 
101 #define VM_DONTCOPY     0x00020000      /* Do not copy this vma on fork */
102 #define VM_DONTEXPAND   0x00040000      /* Cannot expand with mremap() */
103 #define VM_RESERVED     0x00080000      /* Count as reserved_vm like IO */
104 #define VM_ACCOUNT      0x00100000      /* Is a VM accounted object */
105 #define VM_NORESERVE    0x00200000      /* should the VM suppress accounting */
106 #define VM_HUGETLB      0x00400000      /* Huge TLB Page VM */
107 #define VM_NONLINEAR    0x00800000      /* Is non-linear (remap_file_pages) */
108 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
109 #define VM_MAPPED_COPY  0x01000000      /* T if mapped copy of data (nommu mmap) */
110 #else
111 #define VM_HUGEPAGE     0x01000000      /* MADV_HUGEPAGE marked this vma */
112 #endif
113 #define VM_INSERTPAGE   0x02000000      /* The vma has had "vm_insert_page()" done on it */
114 #define VM_ALWAYSDUMP   0x04000000      /* Always include in core dumps */
115 
116 #define VM_CAN_NONLINEAR 0x08000000     /* Has ->fault & does nonlinear pages */
117 #define VM_MIXEDMAP     0x10000000      /* Can contain "struct page" and pure PFN pages */
118 #define VM_SAO          0x20000000      /* Strong Access Ordering (powerpc) */
119 #define VM_PFN_AT_MMAP  0x40000000      /* PFNMAP vma that is fully mapped at mmap time */
120 #define VM_MERGEABLE    0x80000000      /* KSM may merge identical pages */
121 
122 /* Bits set in the VMA until the stack is in its final location */
123 #define VM_STACK_INCOMPLETE_SETUP       (VM_RAND_READ | VM_SEQ_READ)
124 
125 #ifndef VM_STACK_DEFAULT_FLAGS          /* arch can override this */
126 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
127 #endif
128 
129 #ifdef CONFIG_STACK_GROWSUP
130 #define VM_STACK_FLAGS  (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
131 #else
132 #define VM_STACK_FLAGS  (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
133 #endif
134 
135 #define VM_READHINTMASK                 (VM_SEQ_READ | VM_RAND_READ)
136 #define VM_ClearReadHint(v)             (v)->vm_flags &= ~VM_READHINTMASK
137 #define VM_NormalReadHint(v)            (!((v)->vm_flags & VM_READHINTMASK))
138 #define VM_SequentialReadHint(v)        ((v)->vm_flags & VM_SEQ_READ)
139 #define VM_RandomReadHint(v)            ((v)->vm_flags & VM_RAND_READ)
140 
141 /*
142  * Special vmas that are non-mergable, non-mlock()able.
143  * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
144  */
145 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP)
146 
147 /*
148  * mapping from the currently active vm_flags protection bits (the
149  * low four bits) to a page protection mask..
150  */
151 extern pgprot_t protection_map[16];
152 
153 #define FAULT_FLAG_WRITE        0x01    /* Fault was a write access */
154 #define FAULT_FLAG_NONLINEAR    0x02    /* Fault was via a nonlinear mapping */
155 #define FAULT_FLAG_MKWRITE      0x04    /* Fault was mkwrite of existing pte */
156 #define FAULT_FLAG_ALLOW_RETRY  0x08    /* Retry fault if blocking */
157 #define FAULT_FLAG_RETRY_NOWAIT 0x10    /* Don't drop mmap_sem and wait when retrying */
158 #define FAULT_FLAG_KILLABLE     0x20    /* The fault task is in SIGKILL killable region */
159 
160 /*
161  * This interface is used by x86 PAT code to identify a pfn mapping that is
162  * linear over entire vma. This is to optimize PAT code that deals with
163  * marking the physical region with a particular prot. This is not for generic
164  * mm use. Note also that this check will not work if the pfn mapping is
165  * linear for a vma starting at physical address 0. In which case PAT code
166  * falls back to slow path of reserving physical range page by page.
167  */
168 static inline int is_linear_pfn_mapping(struct vm_area_struct *vma)
169 {
170         return !!(vma->vm_flags & VM_PFN_AT_MMAP);
171 }
172 
173 static inline int is_pfn_mapping(struct vm_area_struct *vma)
174 {
175         return !!(vma->vm_flags & VM_PFNMAP);
176 }
177 
178 /*
179  * vm_fault is filled by the the pagefault handler and passed to the vma's
180  * ->fault function. The vma's ->fault is responsible for returning a bitmask
181  * of VM_FAULT_xxx flags that give details about how the fault was handled.
182  *
183  * pgoff should be used in favour of virtual_address, if possible. If pgoff
184  * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear
185  * mapping support.
186  */
187 struct vm_fault {
188         unsigned int flags;             /* FAULT_FLAG_xxx flags */
189         pgoff_t pgoff;                  /* Logical page offset based on vma */
190         void __user *virtual_address;   /* Faulting virtual address */
191 
192         struct page *page;              /* ->fault handlers should return a
193                                          * page here, unless VM_FAULT_NOPAGE
194                                          * is set (which is also implied by
195                                          * VM_FAULT_ERROR).
196                                          */
197 };
198 
199 /*
200  * These are the virtual MM functions - opening of an area, closing and
201  * unmapping it (needed to keep files on disk up-to-date etc), pointer
202  * to the functions called when a no-page or a wp-page exception occurs. 
203  */
204 struct vm_operations_struct {
205         void (*open)(struct vm_area_struct * area);
206         void (*close)(struct vm_area_struct * area);
207         int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
208 
209         /* notification that a previously read-only page is about to become
210          * writable, if an error is returned it will cause a SIGBUS */
211         int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
212 
213         /* called by access_process_vm when get_user_pages() fails, typically
214          * for use by special VMAs that can switch between memory and hardware
215          */
216         int (*access)(struct vm_area_struct *vma, unsigned long addr,
217                       void *buf, int len, int write);
218 #ifdef CONFIG_NUMA
219         /*
220          * set_policy() op must add a reference to any non-NULL @new mempolicy
221          * to hold the policy upon return.  Caller should pass NULL @new to
222          * remove a policy and fall back to surrounding context--i.e. do not
223          * install a MPOL_DEFAULT policy, nor the task or system default
224          * mempolicy.
225          */
226         int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
227 
228         /*
229          * get_policy() op must add reference [mpol_get()] to any policy at
230          * (vma,addr) marked as MPOL_SHARED.  The shared policy infrastructure
231          * in mm/mempolicy.c will do this automatically.
232          * get_policy() must NOT add a ref if the policy at (vma,addr) is not
233          * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
234          * If no [shared/vma] mempolicy exists at the addr, get_policy() op
235          * must return NULL--i.e., do not "fallback" to task or system default
236          * policy.
237          */
238         struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
239                                         unsigned long addr);
240         int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,
241                 const nodemask_t *to, unsigned long flags);
242 #endif
243 };
244 
245 struct mmu_gather;
246 struct inode;
247 
248 #define page_private(page)              ((page)->private)
249 #define set_page_private(page, v)       ((page)->private = (v))
250 
251 /*
252  * FIXME: take this include out, include page-flags.h in
253  * files which need it (119 of them)
254  */
255 #include <linux/page-flags.h>
256 #include <linux/huge_mm.h>
257 
258 /*
259  * Methods to modify the page usage count.
260  *
261  * What counts for a page usage:
262  * - cache mapping   (page->mapping)
263  * - private data    (page->private)
264  * - page mapped in a task's page tables, each mapping
265  *   is counted separately
266  *
267  * Also, many kernel routines increase the page count before a critical
268  * routine so they can be sure the page doesn't go away from under them.
269  */
270 
271 /*
272  * Drop a ref, return true if the refcount fell to zero (the page has no users)
273  */
274 static inline int put_page_testzero(struct page *page)
275 {
276         VM_BUG_ON(atomic_read(&page->_count) == 0);
277         return atomic_dec_and_test(&page->_count);
278 }
279 
280 /*
281  * Try to grab a ref unless the page has a refcount of zero, return false if
282  * that is the case.
283  */
284 static inline int get_page_unless_zero(struct page *page)
285 {
286         return atomic_inc_not_zero(&page->_count);
287 }
288 
289 extern int page_is_ram(unsigned long pfn);
290 
291 /* Support for virtually mapped pages */
292 struct page *vmalloc_to_page(const void *addr);
293 unsigned long vmalloc_to_pfn(const void *addr);
294 
295 /*
296  * Determine if an address is within the vmalloc range
297  *
298  * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
299  * is no special casing required.
300  */
301 static inline int is_vmalloc_addr(const void *x)
302 {
303 #ifdef CONFIG_MMU
304         unsigned long addr = (unsigned long)x;
305 
306         return addr >= VMALLOC_START && addr < VMALLOC_END;
307 #else
308         return 0;
309 #endif
310 }
311 #ifdef CONFIG_MMU
312 extern int is_vmalloc_or_module_addr(const void *x);
313 #else
314 static inline int is_vmalloc_or_module_addr(const void *x)
315 {
316         return 0;
317 }
318 #endif
319 
320 static inline void compound_lock(struct page *page)
321 {
322 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
323         bit_spin_lock(PG_compound_lock, &page->flags);
324 #endif
325 }
326 
327 static inline void compound_unlock(struct page *page)
328 {
329 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
330         bit_spin_unlock(PG_compound_lock, &page->flags);
331 #endif
332 }
333 
334 static inline unsigned long compound_lock_irqsave(struct page *page)
335 {
336         unsigned long uninitialized_var(flags);
337 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
338         local_irq_save(flags);
339         compound_lock(page);
340 #endif
341         return flags;
342 }
343 
344 static inline void compound_unlock_irqrestore(struct page *page,
345                                               unsigned long flags)
346 {
347 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
348         compound_unlock(page);
349         local_irq_restore(flags);
350 #endif
351 }
352 
353 static inline struct page *compound_head(struct page *page)
354 {
355         if (unlikely(PageTail(page)))
356                 return page->first_page;
357         return page;
358 }
359 
360 /*
361  * The atomic page->_mapcount, starts from -1: so that transitions
362  * both from it and to it can be tracked, using atomic_inc_and_test
363  * and atomic_add_negative(-1).
364  */
365 static inline void reset_page_mapcount(struct page *page)
366 {
367         atomic_set(&(page)->_mapcount, -1);
368 }
369 
370 static inline int page_mapcount(struct page *page)
371 {
372         return atomic_read(&(page)->_mapcount) + 1;
373 }
374 
375 static inline int page_count(struct page *page)
376 {
377         return atomic_read(&compound_head(page)->_count);
378 }
379 
380 static inline void get_huge_page_tail(struct page *page)
381 {
382         /*
383          * __split_huge_page_refcount() cannot run
384          * from under us.
385          */
386         VM_BUG_ON(page_mapcount(page) < 0);
387         VM_BUG_ON(atomic_read(&page->_count) != 0);
388         atomic_inc(&page->_mapcount);
389 }
390 
391 extern bool __get_page_tail(struct page *page);
392 
393 static inline void get_page(struct page *page)
394 {
395         if (unlikely(PageTail(page)))
396                 if (likely(__get_page_tail(page)))
397                         return;
398         /*
399          * Getting a normal page or the head of a compound page
400          * requires to already have an elevated page->_count.
401          */
402         VM_BUG_ON(atomic_read(&page->_count) <= 0);
403         atomic_inc(&page->_count);
404 }
405 
406 static inline struct page *virt_to_head_page(const void *x)
407 {
408         struct page *page = virt_to_page(x);
409         return compound_head(page);
410 }
411 
412 /*
413  * Setup the page count before being freed into the page allocator for
414  * the first time (boot or memory hotplug)
415  */
416 static inline void init_page_count(struct page *page)
417 {
418         atomic_set(&page->_count, 1);
419 }
420 
421 /*
422  * PageBuddy() indicate that the page is free and in the buddy system
423  * (see mm/page_alloc.c).
424  *
425  * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
426  * -2 so that an underflow of the page_mapcount() won't be mistaken
427  * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
428  * efficiently by most CPU architectures.
429  */
430 #define PAGE_BUDDY_MAPCOUNT_VALUE (-128)
431 
432 static inline int PageBuddy(struct page *page)
433 {
434         return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE;
435 }
436 
437 static inline void __SetPageBuddy(struct page *page)
438 {
439         VM_BUG_ON(atomic_read(&page->_mapcount) != -1);
440         atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE);
441 }
442 
443 static inline void __ClearPageBuddy(struct page *page)
444 {
445         VM_BUG_ON(!PageBuddy(page));
446         atomic_set(&page->_mapcount, -1);
447 }
448 
449 void put_page(struct page *page);
450 void put_pages_list(struct list_head *pages);
451 
452 void split_page(struct page *page, unsigned int order);
453 int split_free_page(struct page *page);
454 
455 /*
456  * Compound pages have a destructor function.  Provide a
457  * prototype for that function and accessor functions.
458  * These are _only_ valid on the head of a PG_compound page.
459  */
460 typedef void compound_page_dtor(struct page *);
461 
462 static inline void set_compound_page_dtor(struct page *page,
463                                                 compound_page_dtor *dtor)
464 {
465         page[1].lru.next = (void *)dtor;
466 }
467 
468 static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
469 {
470         return (compound_page_dtor *)page[1].lru.next;
471 }
472 
473 static inline int compound_order(struct page *page)
474 {
475         if (!PageHead(page))
476                 return 0;
477         return (unsigned long)page[1].lru.prev;
478 }
479 
480 static inline int compound_trans_order(struct page *page)
481 {
482         int order;
483         unsigned long flags;
484 
485         if (!PageHead(page))
486                 return 0;
487 
488         flags = compound_lock_irqsave(page);
489         order = compound_order(page);
490         compound_unlock_irqrestore(page, flags);
491         return order;
492 }
493 
494 static inline void set_compound_order(struct page *page, unsigned long order)
495 {
496         page[1].lru.prev = (void *)order;
497 }
498 
499 #ifdef CONFIG_MMU
500 /*
501  * Do pte_mkwrite, but only if the vma says VM_WRITE.  We do this when
502  * servicing faults for write access.  In the normal case, do always want
503  * pte_mkwrite.  But get_user_pages can cause write faults for mappings
504  * that do not have writing enabled, when used by access_process_vm.
505  */
506 static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
507 {
508         if (likely(vma->vm_flags & VM_WRITE))
509                 pte = pte_mkwrite(pte);
510         return pte;
511 }
512 #endif
513 
514 /*
515  * Multiple processes may "see" the same page. E.g. for untouched
516  * mappings of /dev/null, all processes see the same page full of
517  * zeroes, and text pages of executables and shared libraries have
518  * only one copy in memory, at most, normally.
519  *
520  * For the non-reserved pages, page_count(page) denotes a reference count.
521  *   page_count() == 0 means the page is free. page->lru is then used for
522  *   freelist management in the buddy allocator.
523  *   page_count() > 0  means the page has been allocated.
524  *
525  * Pages are allocated by the slab allocator in order to provide memory
526  * to kmalloc and kmem_cache_alloc. In this case, the management of the
527  * page, and the fields in 'struct page' are the responsibility of mm/slab.c
528  * unless a particular usage is carefully commented. (the responsibility of
529  * freeing the kmalloc memory is the caller's, of course).
530  *
531  * A page may be used by anyone else who does a __get_free_page().
532  * In this case, page_count still tracks the references, and should only
533  * be used through the normal accessor functions. The top bits of page->flags
534  * and page->virtual store page management information, but all other fields
535  * are unused and could be used privately, carefully. The management of this
536  * page is the responsibility of the one who allocated it, and those who have
537  * subsequently been given references to it.
538  *
539  * The other pages (we may call them "pagecache pages") are completely
540  * managed by the Linux memory manager: I/O, buffers, swapping etc.
541  * The following discussion applies only to them.
542  *
543  * A pagecache page contains an opaque `private' member, which belongs to the
544  * page's address_space. Usually, this is the address of a circular list of
545  * the page's disk buffers. PG_private must be set to tell the VM to call
546  * into the filesystem to release these pages.
547  *
548  * A page may belong to an inode's memory mapping. In this case, page->mapping
549  * is the pointer to the inode, and page->index is the file offset of the page,
550  * in units of PAGE_CACHE_SIZE.
551  *
552  * If pagecache pages are not associated with an inode, they are said to be
553  * anonymous pages. These may become associated with the swapcache, and in that
554  * case PG_swapcache is set, and page->private is an offset into the swapcache.
555  *
556  * In either case (swapcache or inode backed), the pagecache itself holds one
557  * reference to the page. Setting PG_private should also increment the
558  * refcount. The each user mapping also has a reference to the page.
559  *
560  * The pagecache pages are stored in a per-mapping radix tree, which is
561  * rooted at mapping->page_tree, and indexed by offset.
562  * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
563  * lists, we instead now tag pages as dirty/writeback in the radix tree.
564  *
565  * All pagecache pages may be subject to I/O:
566  * - inode pages may need to be read from disk,
567  * - inode pages which have been modified and are MAP_SHARED may need
568  *   to be written back to the inode on disk,
569  * - anonymous pages (including MAP_PRIVATE file mappings) which have been
570  *   modified may need to be swapped out to swap space and (later) to be read
571  *   back into memory.
572  */
573 
574 /*
575  * The zone field is never updated after free_area_init_core()
576  * sets it, so none of the operations on it need to be atomic.
577  */
578 
579 
580 /*
581  * page->flags layout:
582  *
583  * There are three possibilities for how page->flags get
584  * laid out.  The first is for the normal case, without
585  * sparsemem.  The second is for sparsemem when there is
586  * plenty of space for node and section.  The last is when
587  * we have run out of space and have to fall back to an
588  * alternate (slower) way of determining the node.
589  *
590  * No sparsemem or sparsemem vmemmap: |       NODE     | ZONE | ... | FLAGS |
591  * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS |
592  * classic sparse no space for node:  | SECTION |     ZONE    | ... | FLAGS |
593  */
594 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
595 #define SECTIONS_WIDTH          SECTIONS_SHIFT
596 #else
597 #define SECTIONS_WIDTH          0
598 #endif
599 
600 #define ZONES_WIDTH             ZONES_SHIFT
601 
602 #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS
603 #define NODES_WIDTH             NODES_SHIFT
604 #else
605 #ifdef CONFIG_SPARSEMEM_VMEMMAP
606 #error "Vmemmap: No space for nodes field in page flags"
607 #endif
608 #define NODES_WIDTH             0
609 #endif
610 
611 /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */
612 #define SECTIONS_PGOFF          ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
613 #define NODES_PGOFF             (SECTIONS_PGOFF - NODES_WIDTH)
614 #define ZONES_PGOFF             (NODES_PGOFF - ZONES_WIDTH)
615 
616 /*
617  * We are going to use the flags for the page to node mapping if its in
618  * there.  This includes the case where there is no node, so it is implicit.
619  */
620 #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0)
621 #define NODE_NOT_IN_PAGE_FLAGS
622 #endif
623 
624 /*
625  * Define the bit shifts to access each section.  For non-existent
626  * sections we define the shift as 0; that plus a 0 mask ensures
627  * the compiler will optimise away reference to them.
628  */
629 #define SECTIONS_PGSHIFT        (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
630 #define NODES_PGSHIFT           (NODES_PGOFF * (NODES_WIDTH != 0))
631 #define ZONES_PGSHIFT           (ZONES_PGOFF * (ZONES_WIDTH != 0))
632 
633 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
634 #ifdef NODE_NOT_IN_PAGE_FLAGS
635 #define ZONEID_SHIFT            (SECTIONS_SHIFT + ZONES_SHIFT)
636 #define ZONEID_PGOFF            ((SECTIONS_PGOFF < ZONES_PGOFF)? \
637                                                 SECTIONS_PGOFF : ZONES_PGOFF)
638 #else
639 #define ZONEID_SHIFT            (NODES_SHIFT + ZONES_SHIFT)
640 #define ZONEID_PGOFF            ((NODES_PGOFF < ZONES_PGOFF)? \
641                                                 NODES_PGOFF : ZONES_PGOFF)
642 #endif
643 
644 #define ZONEID_PGSHIFT          (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
645 
646 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
647 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
648 #endif
649 
650 #define ZONES_MASK              ((1UL << ZONES_WIDTH) - 1)
651 #define NODES_MASK              ((1UL << NODES_WIDTH) - 1)
652 #define SECTIONS_MASK           ((1UL << SECTIONS_WIDTH) - 1)
653 #define ZONEID_MASK             ((1UL << ZONEID_SHIFT) - 1)
654 
655 static inline enum zone_type page_zonenum(const struct page *page)
656 {
657         return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
658 }
659 
660 /*
661  * The identification function is only used by the buddy allocator for
662  * determining if two pages could be buddies. We are not really
663  * identifying a zone since we could be using a the section number
664  * id if we have not node id available in page flags.
665  * We guarantee only that it will return the same value for two
666  * combinable pages in a zone.
667  */
668 static inline int page_zone_id(struct page *page)
669 {
670         return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
671 }
672 
673 static inline int zone_to_nid(struct zone *zone)
674 {
675 #ifdef CONFIG_NUMA
676         return zone->node;
677 #else
678         return 0;
679 #endif
680 }
681 
682 #ifdef NODE_NOT_IN_PAGE_FLAGS
683 extern int page_to_nid(const struct page *page);
684 #else
685 static inline int page_to_nid(const struct page *page)
686 {
687         return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
688 }
689 #endif
690 
691 static inline struct zone *page_zone(const struct page *page)
692 {
693         return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
694 }
695 
696 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
697 static inline void set_page_section(struct page *page, unsigned long section)
698 {
699         page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
700         page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
701 }
702 
703 static inline unsigned long page_to_section(const struct page *page)
704 {
705         return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
706 }
707 #endif
708 
709 static inline void set_page_zone(struct page *page, enum zone_type zone)
710 {
711         page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
712         page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
713 }
714 
715 static inline void set_page_node(struct page *page, unsigned long node)
716 {
717         page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
718         page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
719 }
720 
721 static inline void set_page_links(struct page *page, enum zone_type zone,
722         unsigned long node, unsigned long pfn)
723 {
724         set_page_zone(page, zone);
725         set_page_node(page, node);
726 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
727         set_page_section(page, pfn_to_section_nr(pfn));
728 #endif
729 }
730 
731 /*
732  * Some inline functions in vmstat.h depend on page_zone()
733  */
734 #include <linux/vmstat.h>
735 
736 static __always_inline void *lowmem_page_address(const struct page *page)
737 {
738         return __va(PFN_PHYS(page_to_pfn(page)));
739 }
740 
741 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
742 #define HASHED_PAGE_VIRTUAL
743 #endif
744 
745 #if defined(WANT_PAGE_VIRTUAL)
746 #define page_address(page) ((page)->virtual)
747 #define set_page_address(page, address)                 \
748         do {                                            \
749                 (page)->virtual = (address);            \
750         } while(0)
751 #define page_address_init()  do { } while(0)
752 #endif
753 
754 #if defined(HASHED_PAGE_VIRTUAL)
755 void *page_address(const struct page *page);
756 void set_page_address(struct page *page, void *virtual);
757 void page_address_init(void);
758 #endif
759 
760 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
761 #define page_address(page) lowmem_page_address(page)
762 #define set_page_address(page, address)  do { } while(0)
763 #define page_address_init()  do { } while(0)
764 #endif
765 
766 /*
767  * On an anonymous page mapped into a user virtual memory area,
768  * page->mapping points to its anon_vma, not to a struct address_space;
769  * with the PAGE_MAPPING_ANON bit set to distinguish it.  See rmap.h.
770  *
771  * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
772  * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
773  * and then page->mapping points, not to an anon_vma, but to a private
774  * structure which KSM associates with that merged page.  See ksm.h.
775  *
776  * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
777  *
778  * Please note that, confusingly, "page_mapping" refers to the inode
779  * address_space which maps the page from disk; whereas "page_mapped"
780  * refers to user virtual address space into which the page is mapped.
781  */
782 #define PAGE_MAPPING_ANON       1
783 #define PAGE_MAPPING_KSM        2
784 #define PAGE_MAPPING_FLAGS      (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
785 
786 extern struct address_space swapper_space;
787 static inline struct address_space *page_mapping(struct page *page)
788 {
789         struct address_space *mapping = page->mapping;
790 
791         VM_BUG_ON(PageSlab(page));
792         if (unlikely(PageSwapCache(page)))
793                 mapping = &swapper_space;
794         else if ((unsigned long)mapping & PAGE_MAPPING_ANON)
795                 mapping = NULL;
796         return mapping;
797 }
798 
799 /* Neutral page->mapping pointer to address_space or anon_vma or other */
800 static inline void *page_rmapping(struct page *page)
801 {
802         return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
803 }
804 
805 static inline int PageAnon(struct page *page)
806 {
807         return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
808 }
809 
810 /*
811  * Return the pagecache index of the passed page.  Regular pagecache pages
812  * use ->index whereas swapcache pages use ->private
813  */
814 static inline pgoff_t page_index(struct page *page)
815 {
816         if (unlikely(PageSwapCache(page)))
817                 return page_private(page);
818         return page->index;
819 }
820 
821 /*
822  * Return true if this page is mapped into pagetables.
823  */
824 static inline int page_mapped(struct page *page)
825 {
826         return atomic_read(&(page)->_mapcount) >= 0;
827 }
828 
829 /*
830  * Different kinds of faults, as returned by handle_mm_fault().
831  * Used to decide whether a process gets delivered SIGBUS or
832  * just gets major/minor fault counters bumped up.
833  */
834 
835 #define VM_FAULT_MINOR  0 /* For backwards compat. Remove me quickly. */
836 
837 #define VM_FAULT_OOM    0x0001
838 #define VM_FAULT_SIGBUS 0x0002
839 #define VM_FAULT_MAJOR  0x0004
840 #define VM_FAULT_WRITE  0x0008  /* Special case for get_user_pages */
841 #define VM_FAULT_HWPOISON 0x0010        /* Hit poisoned small page */
842 #define VM_FAULT_HWPOISON_LARGE 0x0020  /* Hit poisoned large page. Index encoded in upper bits */
843 #define VM_FAULT_SIGSEGV 0x0040
844 
845 #define VM_FAULT_NOPAGE 0x0100  /* ->fault installed the pte, not return page */
846 #define VM_FAULT_LOCKED 0x0200  /* ->fault locked the returned page */
847 #define VM_FAULT_RETRY  0x0400  /* ->fault blocked, must retry */
848 
849 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
850 
851 #define VM_FAULT_ERROR  (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
852                          VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE)
853 
854 /* Encode hstate index for a hwpoisoned large page */
855 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
856 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
857 
858 /*
859  * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
860  */
861 extern void pagefault_out_of_memory(void);
862 
863 #define offset_in_page(p)       ((unsigned long)(p) & ~PAGE_MASK)
864 
865 /*
866  * Flags passed to show_mem() and show_free_areas() to suppress output in
867  * various contexts.
868  */
869 #define SHOW_MEM_FILTER_NODES           (0x0001u)       /* disallowed nodes */
870 #define SHOW_MEM_FILTER_PAGE_COUNT      (0x0002u)       /* page type count */
871 
872 extern void show_free_areas(unsigned int flags);
873 extern bool skip_free_areas_node(unsigned int flags, int nid);
874 
875 int shmem_lock(struct file *file, int lock, struct user_struct *user);
876 struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags);
877 int shmem_zero_setup(struct vm_area_struct *);
878 
879 extern int can_do_mlock(void);
880 extern int user_shm_lock(size_t, struct user_struct *);
881 extern void user_shm_unlock(size_t, struct user_struct *);
882 
883 /*
884  * Parameter block passed down to zap_pte_range in exceptional cases.
885  */
886 struct zap_details {
887         struct vm_area_struct *nonlinear_vma;   /* Check page->index if set */
888         struct address_space *check_mapping;    /* Check page->mapping if set */
889         pgoff_t first_index;                    /* Lowest page->index to unmap */
890         pgoff_t last_index;                     /* Highest page->index to unmap */
891 };
892 
893 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
894                 pte_t pte);
895 
896 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
897                 unsigned long size);
898 unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
899                 unsigned long size, struct zap_details *);
900 unsigned long unmap_vmas(struct mmu_gather *tlb,
901                 struct vm_area_struct *start_vma, unsigned long start_addr,
902                 unsigned long end_addr, unsigned long *nr_accounted,
903                 struct zap_details *);
904 
905 /**
906  * mm_walk - callbacks for walk_page_range
907  * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
908  * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
909  * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
910  *             this handler is required to be able to handle
911  *             pmd_trans_huge() pmds.  They may simply choose to
912  *             split_huge_page() instead of handling it explicitly.
913  * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
914  * @pte_hole: if set, called for each hole at all levels
915  * @hugetlb_entry: if set, called for each hugetlb entry
916  *                 *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
917  *                            is used.
918  *
919  * (see walk_page_range for more details)
920  */
921 struct mm_walk {
922         int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *);
923         int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *);
924         int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *);
925         int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *);
926         int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *);
927         int (*hugetlb_entry)(pte_t *, unsigned long,
928                              unsigned long, unsigned long, struct mm_walk *);
929         struct mm_struct *mm;
930         void *private;
931 };
932 
933 int walk_page_range(unsigned long addr, unsigned long end,
934                 struct mm_walk *walk);
935 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
936                 unsigned long end, unsigned long floor, unsigned long ceiling);
937 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
938                         struct vm_area_struct *vma);
939 void unmap_mapping_range(struct address_space *mapping,
940                 loff_t const holebegin, loff_t const holelen, int even_cows);
941 int follow_pfn(struct vm_area_struct *vma, unsigned long address,
942         unsigned long *pfn);
943 int follow_phys(struct vm_area_struct *vma, unsigned long address,
944                 unsigned int flags, unsigned long *prot, resource_size_t *phys);
945 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
946                         void *buf, int len, int write);
947 
948 static inline void unmap_shared_mapping_range(struct address_space *mapping,
949                 loff_t const holebegin, loff_t const holelen)
950 {
951         unmap_mapping_range(mapping, holebegin, holelen, 0);
952 }
953 
954 extern void truncate_pagecache(struct inode *inode, loff_t old, loff_t new);
955 extern void truncate_setsize(struct inode *inode, loff_t newsize);
956 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
957 extern int vmtruncate(struct inode *inode, loff_t offset);
958 extern int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end);
959 
960 int truncate_inode_page(struct address_space *mapping, struct page *page);
961 int generic_error_remove_page(struct address_space *mapping, struct page *page);
962 
963 int invalidate_inode_page(struct page *page);
964 
965 #ifdef CONFIG_MMU
966 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
967                         unsigned long address, unsigned int flags);
968 extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
969                             unsigned long address, unsigned int fault_flags);
970 #else
971 static inline int handle_mm_fault(struct mm_struct *mm,
972                         struct vm_area_struct *vma, unsigned long address,
973                         unsigned int flags)
974 {
975         /* should never happen if there's no MMU */
976         BUG();
977         return VM_FAULT_SIGBUS;
978 }
979 static inline int fixup_user_fault(struct task_struct *tsk,
980                 struct mm_struct *mm, unsigned long address,
981                 unsigned int fault_flags)
982 {
983         /* should never happen if there's no MMU */
984         BUG();
985         return -EFAULT;
986 }
987 #endif
988 
989 extern int make_pages_present(unsigned long addr, unsigned long end);
990 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
991 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
992                 void *buf, int len, int write);
993 
994 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
995                      unsigned long start, int len, unsigned int foll_flags,
996                      struct page **pages, struct vm_area_struct **vmas,
997                      int *nonblocking);
998 int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
999                         unsigned long start, int nr_pages, int write, int force,
1000                         struct page **pages, struct vm_area_struct **vmas);
1001 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
1002                         struct page **pages);
1003 struct page *get_dump_page(unsigned long addr);
1004 
1005 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
1006 extern void do_invalidatepage(struct page *page, unsigned long offset);
1007 
1008 int __set_page_dirty_nobuffers(struct page *page);
1009 int __set_page_dirty_no_writeback(struct page *page);
1010 int redirty_page_for_writepage(struct writeback_control *wbc,
1011                                 struct page *page);
1012 void account_page_dirtied(struct page *page, struct address_space *mapping);
1013 void account_page_writeback(struct page *page);
1014 int set_page_dirty(struct page *page);
1015 int set_page_dirty_lock(struct page *page);
1016 int clear_page_dirty_for_io(struct page *page);
1017 
1018 extern unsigned long move_page_tables(struct vm_area_struct *vma,
1019                 unsigned long old_addr, struct vm_area_struct *new_vma,
1020                 unsigned long new_addr, unsigned long len);
1021 extern unsigned long do_mremap(unsigned long addr,
1022                                unsigned long old_len, unsigned long new_len,
1023                                unsigned long flags, unsigned long new_addr);
1024 extern int mprotect_fixup(struct vm_area_struct *vma,
1025                           struct vm_area_struct **pprev, unsigned long start,
1026                           unsigned long end, unsigned long newflags);
1027 
1028 /*
1029  * doesn't attempt to fault and will return short.
1030  */
1031 int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
1032                           struct page **pages);
1033 /*
1034  * per-process(per-mm_struct) statistics.
1035  */
1036 static inline void set_mm_counter(struct mm_struct *mm, int member, long value)
1037 {
1038         atomic_long_set(&mm->rss_stat.count[member], value);
1039 }
1040 
1041 #if defined(SPLIT_RSS_COUNTING)
1042 unsigned long get_mm_counter(struct mm_struct *mm, int member);
1043 #else
1044 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
1045 {
1046         return atomic_long_read(&mm->rss_stat.count[member]);
1047 }
1048 #endif
1049 
1050 static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
1051 {
1052         atomic_long_add(value, &mm->rss_stat.count[member]);
1053 }
1054 
1055 static inline void inc_mm_counter(struct mm_struct *mm, int member)
1056 {
1057         atomic_long_inc(&mm->rss_stat.count[member]);
1058 }
1059 
1060 static inline void dec_mm_counter(struct mm_struct *mm, int member)
1061 {
1062         atomic_long_dec(&mm->rss_stat.count[member]);
1063 }
1064 
1065 static inline unsigned long get_mm_rss(struct mm_struct *mm)
1066 {
1067         return get_mm_counter(mm, MM_FILEPAGES) +
1068                 get_mm_counter(mm, MM_ANONPAGES);
1069 }
1070 
1071 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
1072 {
1073         return max(mm->hiwater_rss, get_mm_rss(mm));
1074 }
1075 
1076 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
1077 {
1078         return max(mm->hiwater_vm, mm->total_vm);
1079 }
1080 
1081 static inline void update_hiwater_rss(struct mm_struct *mm)
1082 {
1083         unsigned long _rss = get_mm_rss(mm);
1084 
1085         if ((mm)->hiwater_rss < _rss)
1086                 (mm)->hiwater_rss = _rss;
1087 }
1088 
1089 static inline void update_hiwater_vm(struct mm_struct *mm)
1090 {
1091         if (mm->hiwater_vm < mm->total_vm)
1092                 mm->hiwater_vm = mm->total_vm;
1093 }
1094 
1095 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
1096                                          struct mm_struct *mm)
1097 {
1098         unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
1099 
1100         if (*maxrss < hiwater_rss)
1101                 *maxrss = hiwater_rss;
1102 }
1103 
1104 #if defined(SPLIT_RSS_COUNTING)
1105 void sync_mm_rss(struct task_struct *task, struct mm_struct *mm);
1106 #else
1107 static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
1108 {
1109 }
1110 #endif
1111 
1112 int vma_wants_writenotify(struct vm_area_struct *vma);
1113 
1114 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
1115                                spinlock_t **ptl);
1116 static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
1117                                     spinlock_t **ptl)
1118 {
1119         pte_t *ptep;
1120         __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
1121         return ptep;
1122 }
1123 
1124 #ifdef __PAGETABLE_PUD_FOLDED
1125 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
1126                                                 unsigned long address)
1127 {
1128         return 0;
1129 }
1130 #else
1131 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
1132 #endif
1133 
1134 #ifdef __PAGETABLE_PMD_FOLDED
1135 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
1136                                                 unsigned long address)
1137 {
1138         return 0;
1139 }
1140 #else
1141 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
1142 #endif
1143 
1144 int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
1145                 pmd_t *pmd, unsigned long address);
1146 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
1147 
1148 /*
1149  * The following ifdef needed to get the 4level-fixup.h header to work.
1150  * Remove it when 4level-fixup.h has been removed.
1151  */
1152 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
1153 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
1154 {
1155         return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
1156                 NULL: pud_offset(pgd, address);
1157 }
1158 
1159 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
1160 {
1161         return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
1162                 NULL: pmd_offset(pud, address);
1163 }
1164 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
1165 
1166 #if USE_SPLIT_PTLOCKS
1167 /*
1168  * We tuck a spinlock to guard each pagetable page into its struct page,
1169  * at page->private, with BUILD_BUG_ON to make sure that this will not
1170  * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
1171  * When freeing, reset page->mapping so free_pages_check won't complain.
1172  */
1173 #define __pte_lockptr(page)     &((page)->ptl)
1174 #define pte_lock_init(_page)    do {                                    \
1175         spin_lock_init(__pte_lockptr(_page));                           \
1176 } while (0)
1177 #define pte_lock_deinit(page)   ((page)->mapping = NULL)
1178 #define pte_lockptr(mm, pmd)    ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
1179 #else   /* !USE_SPLIT_PTLOCKS */
1180 /*
1181  * We use mm->page_table_lock to guard all pagetable pages of the mm.
1182  */
1183 #define pte_lock_init(page)     do {} while (0)
1184 #define pte_lock_deinit(page)   do {} while (0)
1185 #define pte_lockptr(mm, pmd)    ({(void)(pmd); &(mm)->page_table_lock;})
1186 #endif /* USE_SPLIT_PTLOCKS */
1187 
1188 static inline void pgtable_page_ctor(struct page *page)
1189 {
1190         pte_lock_init(page);
1191         inc_zone_page_state(page, NR_PAGETABLE);
1192 }
1193 
1194 static inline void pgtable_page_dtor(struct page *page)
1195 {
1196         pte_lock_deinit(page);
1197         dec_zone_page_state(page, NR_PAGETABLE);
1198 }
1199 
1200 #define pte_offset_map_lock(mm, pmd, address, ptlp)     \
1201 ({                                                      \
1202         spinlock_t *__ptl = pte_lockptr(mm, pmd);       \
1203         pte_t *__pte = pte_offset_map(pmd, address);    \
1204         *(ptlp) = __ptl;                                \
1205         spin_lock(__ptl);                               \
1206         __pte;                                          \
1207 })
1208 
1209 #define pte_unmap_unlock(pte, ptl)      do {            \
1210         spin_unlock(ptl);                               \
1211         pte_unmap(pte);                                 \
1212 } while (0)
1213 
1214 #define pte_alloc_map(mm, vma, pmd, address)                            \
1215         ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma,    \
1216                                                         pmd, address))? \
1217          NULL: pte_offset_map(pmd, address))
1218 
1219 #define pte_alloc_map_lock(mm, pmd, address, ptlp)      \
1220         ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL,   \
1221                                                         pmd, address))? \
1222                 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
1223 
1224 #define pte_alloc_kernel(pmd, address)                  \
1225         ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1226                 NULL: pte_offset_kernel(pmd, address))
1227 
1228 extern void free_area_init(unsigned long * zones_size);
1229 extern void free_area_init_node(int nid, unsigned long * zones_size,
1230                 unsigned long zone_start_pfn, unsigned long *zholes_size);
1231 #ifdef CONFIG_ARCH_POPULATES_NODE_MAP
1232 /*
1233  * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its
1234  * zones, allocate the backing mem_map and account for memory holes in a more
1235  * architecture independent manner. This is a substitute for creating the
1236  * zone_sizes[] and zholes_size[] arrays and passing them to
1237  * free_area_init_node()
1238  *
1239  * An architecture is expected to register range of page frames backed by
1240  * physical memory with add_active_range() before calling
1241  * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
1242  * usage, an architecture is expected to do something like
1243  *
1244  * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
1245  *                                                       max_highmem_pfn};
1246  * for_each_valid_physical_page_range()
1247  *      add_active_range(node_id, start_pfn, end_pfn)
1248  * free_area_init_nodes(max_zone_pfns);
1249  *
1250  * If the architecture guarantees that there are no holes in the ranges
1251  * registered with add_active_range(), free_bootmem_active_regions()
1252  * will call free_bootmem_node() for each registered physical page range.
1253  * Similarly sparse_memory_present_with_active_regions() calls
1254  * memory_present() for each range when SPARSEMEM is enabled.
1255  *
1256  * See mm/page_alloc.c for more information on each function exposed by
1257  * CONFIG_ARCH_POPULATES_NODE_MAP
1258  */
1259 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1260 extern void add_active_range(unsigned int nid, unsigned long start_pfn,
1261                                         unsigned long end_pfn);
1262 extern void remove_active_range(unsigned int nid, unsigned long start_pfn,
1263                                         unsigned long end_pfn);
1264 extern void remove_all_active_ranges(void);
1265 void sort_node_map(void);
1266 unsigned long node_map_pfn_alignment(void);
1267 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
1268                                                 unsigned long end_pfn);
1269 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
1270                                                 unsigned long end_pfn);
1271 extern void get_pfn_range_for_nid(unsigned int nid,
1272                         unsigned long *start_pfn, unsigned long *end_pfn);
1273 extern unsigned long find_min_pfn_with_active_regions(void);
1274 extern void free_bootmem_with_active_regions(int nid,
1275                                                 unsigned long max_low_pfn);
1276 int add_from_early_node_map(struct range *range, int az,
1277                                    int nr_range, int nid);
1278 u64 __init find_memory_core_early(int nid, u64 size, u64 align,
1279                                         u64 goal, u64 limit);
1280 typedef int (*work_fn_t)(unsigned long, unsigned long, void *);
1281 extern void work_with_active_regions(int nid, work_fn_t work_fn, void *data);
1282 extern void sparse_memory_present_with_active_regions(int nid);
1283 #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
1284 
1285 #if !defined(CONFIG_ARCH_POPULATES_NODE_MAP) && \
1286     !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
1287 static inline int __early_pfn_to_nid(unsigned long pfn)
1288 {
1289         return 0;
1290 }
1291 #else
1292 /* please see mm/page_alloc.c */
1293 extern int __meminit early_pfn_to_nid(unsigned long pfn);
1294 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
1295 /* there is a per-arch backend function. */
1296 extern int __meminit __early_pfn_to_nid(unsigned long pfn);
1297 #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
1298 #endif
1299 
1300 extern void set_dma_reserve(unsigned long new_dma_reserve);
1301 extern void memmap_init_zone(unsigned long, int, unsigned long,
1302                                 unsigned long, enum memmap_context);
1303 extern void setup_per_zone_wmarks(void);
1304 extern int __meminit init_per_zone_wmark_min(void);
1305 extern void mem_init(void);
1306 extern void __init mmap_init(void);
1307 extern void show_mem(unsigned int flags);
1308 extern void si_meminfo(struct sysinfo * val);
1309 extern void si_meminfo_node(struct sysinfo *val, int nid);
1310 extern int after_bootmem;
1311 
1312 extern __printf(3, 4)
1313 void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
1314 
1315 extern void setup_per_cpu_pageset(void);
1316 
1317 extern void zone_pcp_update(struct zone *zone);
1318 
1319 /* nommu.c */
1320 extern atomic_long_t mmap_pages_allocated;
1321 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1322 
1323 /* prio_tree.c */
1324 void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old);
1325 void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *);
1326 void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *);
1327 struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma,
1328         struct prio_tree_iter *iter);
1329 
1330 #define vma_prio_tree_foreach(vma, iter, root, begin, end)      \
1331         for (prio_tree_iter_init(iter, root, begin, end), vma = NULL;   \
1332                 (vma = vma_prio_tree_next(vma, iter)); )
1333 
1334 static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
1335                                         struct list_head *list)
1336 {
1337         vma->shared.vm_set.parent = NULL;
1338         list_add_tail(&vma->shared.vm_set.list, list);
1339 }
1340 
1341 /* mmap.c */
1342 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1343 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
1344         unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1345 extern struct vm_area_struct *vma_merge(struct mm_struct *,
1346         struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1347         unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1348         struct mempolicy *);
1349 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1350 extern int split_vma(struct mm_struct *,
1351         struct vm_area_struct *, unsigned long addr, int new_below);
1352 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1353 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1354         struct rb_node **, struct rb_node *);
1355 extern void unlink_file_vma(struct vm_area_struct *);
1356 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1357         unsigned long addr, unsigned long len, pgoff_t pgoff);
1358 extern void exit_mmap(struct mm_struct *);
1359 
1360 extern int mm_take_all_locks(struct mm_struct *mm);
1361 extern void mm_drop_all_locks(struct mm_struct *mm);
1362 
1363 /* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */
1364 extern void added_exe_file_vma(struct mm_struct *mm);
1365 extern void removed_exe_file_vma(struct mm_struct *mm);
1366 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
1367 extern struct file *get_mm_exe_file(struct mm_struct *mm);
1368 
1369 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1370 extern int install_special_mapping(struct mm_struct *mm,
1371                                    unsigned long addr, unsigned long len,
1372                                    unsigned long flags, struct page **pages);
1373 
1374 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1375 
1376 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1377         unsigned long len, unsigned long prot,
1378         unsigned long flag, unsigned long pgoff);
1379 extern unsigned long mmap_region(struct file *file, unsigned long addr,
1380         unsigned long len, unsigned long flags,
1381         vm_flags_t vm_flags, unsigned long pgoff);
1382 
1383 static inline unsigned long do_mmap(struct file *file, unsigned long addr,
1384         unsigned long len, unsigned long prot,
1385         unsigned long flag, unsigned long offset)
1386 {
1387         unsigned long ret = -EINVAL;
1388         if ((offset + PAGE_ALIGN(len)) < offset)
1389                 goto out;
1390         if (!(offset & ~PAGE_MASK))
1391                 ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);
1392 out:
1393         return ret;
1394 }
1395 
1396 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1397 
1398 extern unsigned long do_brk(unsigned long, unsigned long);
1399 
1400 /* truncate.c */
1401 extern void truncate_inode_pages(struct address_space *, loff_t);
1402 extern void truncate_inode_pages_range(struct address_space *,
1403                                        loff_t lstart, loff_t lend);
1404 
1405 /* generic vm_area_ops exported for stackable file systems */
1406 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
1407 
1408 /* mm/page-writeback.c */
1409 int write_one_page(struct page *page, int wait);
1410 void task_dirty_inc(struct task_struct *tsk);
1411 
1412 /* readahead.c */
1413 #define VM_MAX_READAHEAD        128     /* kbytes */
1414 #define VM_MIN_READAHEAD        16      /* kbytes (includes current page) */
1415 
1416 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
1417                         pgoff_t offset, unsigned long nr_to_read);
1418 
1419 void page_cache_sync_readahead(struct address_space *mapping,
1420                                struct file_ra_state *ra,
1421                                struct file *filp,
1422                                pgoff_t offset,
1423                                unsigned long size);
1424 
1425 void page_cache_async_readahead(struct address_space *mapping,
1426                                 struct file_ra_state *ra,
1427                                 struct file *filp,
1428                                 struct page *pg,
1429                                 pgoff_t offset,
1430                                 unsigned long size);
1431 
1432 unsigned long max_sane_readahead(unsigned long nr);
1433 unsigned long ra_submit(struct file_ra_state *ra,
1434                         struct address_space *mapping,
1435                         struct file *filp);
1436 
1437 extern unsigned long stack_guard_gap;
1438 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
1439 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1440 
1441 /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
1442 extern int expand_downwards(struct vm_area_struct *vma,
1443                 unsigned long address);
1444 #if VM_GROWSUP
1445 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1446 #else
1447   #define expand_upwards(vma, address) (0)
1448 #endif
1449 
1450 /* Look up the first VMA which satisfies  addr < vm_end,  NULL if none. */
1451 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1452 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1453                                              struct vm_area_struct **pprev);
1454 
1455 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1456    NULL if none.  Assume start_addr < end_addr. */
1457 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1458 {
1459         struct vm_area_struct * vma = find_vma(mm,start_addr);
1460 
1461         if (vma && end_addr <= vma->vm_start)
1462                 vma = NULL;
1463         return vma;
1464 }
1465 
1466 static inline unsigned long vm_start_gap(struct vm_area_struct *vma)
1467 {
1468         unsigned long vm_start = vma->vm_start;
1469 
1470         if (vma->vm_flags & VM_GROWSDOWN) {
1471                 vm_start -= stack_guard_gap;
1472                 if (vm_start > vma->vm_start)
1473                         vm_start = 0;
1474         }
1475         return vm_start;
1476 }
1477 
1478 static inline unsigned long vm_end_gap(struct vm_area_struct *vma)
1479 {
1480         unsigned long vm_end = vma->vm_end;
1481 
1482         if (vma->vm_flags & VM_GROWSUP) {
1483                 vm_end += stack_guard_gap;
1484                 if (vm_end < vma->vm_end)
1485                         vm_end = -PAGE_SIZE;
1486         }
1487         return vm_end;
1488 }
1489 
1490 static inline unsigned long vma_pages(struct vm_area_struct *vma)
1491 {
1492         return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
1493 }
1494 
1495 #ifdef CONFIG_MMU
1496 pgprot_t vm_get_page_prot(unsigned long vm_flags);
1497 #else
1498 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
1499 {
1500         return __pgprot(0);
1501 }
1502 #endif
1503 
1504 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
1505 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
1506                         unsigned long pfn, unsigned long size, pgprot_t);
1507 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
1508 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
1509                         unsigned long pfn);
1510 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
1511                         unsigned long pfn);
1512 int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
1513 
1514 
1515 struct page *follow_page(struct vm_area_struct *, unsigned long address,
1516                         unsigned int foll_flags);
1517 #define FOLL_WRITE      0x01    /* check pte is writable */
1518 #define FOLL_TOUCH      0x02    /* mark page accessed */
1519 #define FOLL_GET        0x04    /* do get_page on page */
1520 #define FOLL_DUMP       0x08    /* give error on hole if it would be zero */
1521 #define FOLL_FORCE      0x10    /* get_user_pages read/write w/o permission */
1522 #define FOLL_NOWAIT     0x20    /* if a disk transfer is needed, start the IO
1523                                  * and return without waiting upon it */
1524 #define FOLL_MLOCK      0x40    /* mark page as mlocked */
1525 #define FOLL_SPLIT      0x80    /* don't return transhuge pages, split them */
1526 #define FOLL_HWPOISON   0x100   /* check page is hwpoisoned */
1527 #define FOLL_COW        0x4000  /* internal GUP flag */
1528 
1529 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
1530                         void *data);
1531 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
1532                                unsigned long size, pte_fn_t fn, void *data);
1533 
1534 #ifdef CONFIG_PROC_FS
1535 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
1536 #else
1537 static inline void vm_stat_account(struct mm_struct *mm,
1538                         unsigned long flags, struct file *file, long pages)
1539 {
1540 }
1541 #endif /* CONFIG_PROC_FS */
1542 
1543 #ifdef CONFIG_DEBUG_PAGEALLOC
1544 extern int debug_pagealloc_enabled;
1545 
1546 extern void kernel_map_pages(struct page *page, int numpages, int enable);
1547 
1548 static inline void enable_debug_pagealloc(void)
1549 {
1550         debug_pagealloc_enabled = 1;
1551 }
1552 #ifdef CONFIG_HIBERNATION
1553 extern bool kernel_page_present(struct page *page);
1554 #endif /* CONFIG_HIBERNATION */
1555 #else
1556 static inline void
1557 kernel_map_pages(struct page *page, int numpages, int enable) {}
1558 static inline void enable_debug_pagealloc(void)
1559 {
1560 }
1561 #ifdef CONFIG_HIBERNATION
1562 static inline bool kernel_page_present(struct page *page) { return true; }
1563 #endif /* CONFIG_HIBERNATION */
1564 #endif
1565 
1566 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
1567 #ifdef  __HAVE_ARCH_GATE_AREA
1568 int in_gate_area_no_mm(unsigned long addr);
1569 int in_gate_area(struct mm_struct *mm, unsigned long addr);
1570 #else
1571 int in_gate_area_no_mm(unsigned long addr);
1572 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
1573 #endif  /* __HAVE_ARCH_GATE_AREA */
1574 
1575 int drop_caches_sysctl_handler(struct ctl_table *, int,
1576                                         void __user *, size_t *, loff_t *);
1577 unsigned long shrink_slab(struct shrink_control *shrink,
1578                           unsigned long nr_pages_scanned,
1579                           unsigned long lru_pages);
1580 
1581 #ifndef CONFIG_MMU
1582 #define randomize_va_space 0
1583 #else
1584 extern int randomize_va_space;
1585 #endif
1586 
1587 const char * arch_vma_name(struct vm_area_struct *vma);
1588 void print_vma_addr(char *prefix, unsigned long rip);
1589 
1590 void sparse_mem_maps_populate_node(struct page **map_map,
1591                                    unsigned long pnum_begin,
1592                                    unsigned long pnum_end,
1593                                    unsigned long map_count,
1594                                    int nodeid);
1595 
1596 struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
1597 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
1598 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
1599 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
1600 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
1601 void *vmemmap_alloc_block(unsigned long size, int node);
1602 void *vmemmap_alloc_block_buf(unsigned long size, int node);
1603 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
1604 int vmemmap_populate_basepages(struct page *start_page,
1605                                                 unsigned long pages, int node);
1606 int vmemmap_populate(struct page *start_page, unsigned long pages, int node);
1607 void vmemmap_populate_print_last(void);
1608 
1609 
1610 enum mf_flags {
1611         MF_COUNT_INCREASED = 1 << 0,
1612 };
1613 extern void memory_failure(unsigned long pfn, int trapno);
1614 extern int __memory_failure(unsigned long pfn, int trapno, int flags);
1615 extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
1616 extern int unpoison_memory(unsigned long pfn);
1617 extern int sysctl_memory_failure_early_kill;
1618 extern int sysctl_memory_failure_recovery;
1619 extern void shake_page(struct page *p, int access);
1620 extern atomic_long_t mce_bad_pages;
1621 extern int soft_offline_page(struct page *page, int flags);
1622 
1623 extern void dump_page(struct page *page);
1624 
1625 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
1626 extern void clear_huge_page(struct page *page,
1627                             unsigned long addr,
1628                             unsigned int pages_per_huge_page);
1629 extern void copy_user_huge_page(struct page *dst, struct page *src,
1630                                 unsigned long addr, struct vm_area_struct *vma,
1631                                 unsigned int pages_per_huge_page);
1632 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
1633 
1634 #endif /* __KERNEL__ */
1635 #endif /* _LINUX_MM_H */
1636 

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