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