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 #include <linux/range.h> 16 #include <linux/pfn.h> 17 18 struct mempolicy; 19 struct anon_vma; 20 struct file_ra_state; 21 struct user_struct; 22 struct writeback_control; 23 24 #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */ 25 extern unsigned long max_mapnr; 26 #endif 27 28 extern unsigned long num_physpages; 29 extern unsigned long totalram_pages; 30 extern void * high_memory; 31 extern int page_cluster; 32 33 #ifdef CONFIG_SYSCTL 34 extern int sysctl_legacy_va_layout; 35 #else 36 #define sysctl_legacy_va_layout 0 37 #endif 38 39 #include <asm/page.h> 40 #include <asm/pgtable.h> 41 #include <asm/processor.h> 42 43 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) 44 45 /* to align the pointer to the (next) page boundary */ 46 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) 47 48 /* 49 * Linux kernel virtual memory manager primitives. 50 * The idea being to have a "virtual" mm in the same way 51 * we have a virtual fs - giving a cleaner interface to the 52 * mm details, and allowing different kinds of memory mappings 53 * (from shared memory to executable loading to arbitrary 54 * mmap() functions). 55 */ 56 57 extern struct kmem_cache *vm_area_cachep; 58 59 #ifndef CONFIG_MMU 60 extern struct rb_root nommu_region_tree; 61 extern struct rw_semaphore nommu_region_sem; 62 63 extern unsigned int kobjsize(const void *objp); 64 #endif 65 66 /* 67 * vm_flags in vm_area_struct, see mm_types.h. 68 */ 69 #define VM_READ 0x00000001 /* currently active flags */ 70 #define VM_WRITE 0x00000002 71 #define VM_EXEC 0x00000004 72 #define VM_SHARED 0x00000008 73 74 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ 75 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ 76 #define VM_MAYWRITE 0x00000020 77 #define VM_MAYEXEC 0x00000040 78 #define VM_MAYSHARE 0x00000080 79 80 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ 81 #if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64) 82 #define VM_GROWSUP 0x00000200 83 #else 84 #define VM_GROWSUP 0x00000000 85 #endif 86 #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ 87 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ 88 89 #define VM_EXECUTABLE 0x00001000 90 #define VM_LOCKED 0x00002000 91 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ 92 93 /* Used by sys_madvise() */ 94 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ 95 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ 96 97 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ 98 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ 99 #define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */ 100 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ 101 #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ 102 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ 103 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */ 104 #define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */ 105 #define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */ 106 #define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */ 107 108 #define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */ 109 #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ 110 #define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */ 111 #define VM_PFN_AT_MMAP 0x40000000 /* PFNMAP vma that is fully mapped at mmap time */ 112 #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ 113 114 /* Bits set in the VMA until the stack is in its final location */ 115 #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) 116 117 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ 118 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS 119 #endif 120 121 #ifdef CONFIG_STACK_GROWSUP 122 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) 123 #else 124 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) 125 #endif 126 127 #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ) 128 #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK 129 #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK)) 130 #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ) 131 #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ) 132 133 /* 134 * special vmas that are non-mergable, non-mlock()able 135 */ 136 #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP) 137 138 /* 139 * mapping from the currently active vm_flags protection bits (the 140 * low four bits) to a page protection mask.. 141 */ 142 extern pgprot_t protection_map[16]; 143 144 #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ 145 #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ 146 #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */ 147 148 /* 149 * This interface is used by x86 PAT code to identify a pfn mapping that is 150 * linear over entire vma. This is to optimize PAT code that deals with 151 * marking the physical region with a particular prot. This is not for generic 152 * mm use. Note also that this check will not work if the pfn mapping is 153 * linear for a vma starting at physical address 0. In which case PAT code 154 * falls back to slow path of reserving physical range page by page. 155 */ 156 static inline int is_linear_pfn_mapping(struct vm_area_struct *vma) 157 { 158 return (vma->vm_flags & VM_PFN_AT_MMAP); 159 } 160 161 static inline int is_pfn_mapping(struct vm_area_struct *vma) 162 { 163 return (vma->vm_flags & VM_PFNMAP); 164 } 165 166 /* 167 * vm_fault is filled by the the pagefault handler and passed to the vma's 168 * ->fault function. The vma's ->fault is responsible for returning a bitmask 169 * of VM_FAULT_xxx flags that give details about how the fault was handled. 170 * 171 * pgoff should be used in favour of virtual_address, if possible. If pgoff 172 * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear 173 * mapping support. 174 */ 175 struct vm_fault { 176 unsigned int flags; /* FAULT_FLAG_xxx flags */ 177 pgoff_t pgoff; /* Logical page offset based on vma */ 178 void __user *virtual_address; /* Faulting virtual address */ 179 180 struct page *page; /* ->fault handlers should return a 181 * page here, unless VM_FAULT_NOPAGE 182 * is set (which is also implied by 183 * VM_FAULT_ERROR). 184 */ 185 }; 186 187 /* 188 * These are the virtual MM functions - opening of an area, closing and 189 * unmapping it (needed to keep files on disk up-to-date etc), pointer 190 * to the functions called when a no-page or a wp-page exception occurs. 191 */ 192 struct vm_operations_struct { 193 void (*open)(struct vm_area_struct * area); 194 void (*close)(struct vm_area_struct * area); 195 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); 196 197 /* notification that a previously read-only page is about to become 198 * writable, if an error is returned it will cause a SIGBUS */ 199 int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); 200 201 /* called by access_process_vm when get_user_pages() fails, typically 202 * for use by special VMAs that can switch between memory and hardware 203 */ 204 int (*access)(struct vm_area_struct *vma, unsigned long addr, 205 void *buf, int len, int write); 206 #ifdef CONFIG_NUMA 207 /* 208 * set_policy() op must add a reference to any non-NULL @new mempolicy 209 * to hold the policy upon return. Caller should pass NULL @new to 210 * remove a policy and fall back to surrounding context--i.e. do not 211 * install a MPOL_DEFAULT policy, nor the task or system default 212 * mempolicy. 213 */ 214 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); 215 216 /* 217 * get_policy() op must add reference [mpol_get()] to any policy at 218 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure 219 * in mm/mempolicy.c will do this automatically. 220 * get_policy() must NOT add a ref if the policy at (vma,addr) is not 221 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. 222 * If no [shared/vma] mempolicy exists at the addr, get_policy() op 223 * must return NULL--i.e., do not "fallback" to task or system default 224 * policy. 225 */ 226 struct mempolicy *(*get_policy)(struct vm_area_struct *vma, 227 unsigned long addr); 228 int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, 229 const nodemask_t *to, unsigned long flags); 230 #endif 231 }; 232 233 struct mmu_gather; 234 struct inode; 235 236 #define page_private(page) ((page)->private) 237 #define set_page_private(page, v) ((page)->private = (v)) 238 239 /* 240 * FIXME: take this include out, include page-flags.h in 241 * files which need it (119 of them) 242 */ 243 #include <linux/page-flags.h> 244 245 /* 246 * Methods to modify the page usage count. 247 * 248 * What counts for a page usage: 249 * - cache mapping (page->mapping) 250 * - private data (page->private) 251 * - page mapped in a task's page tables, each mapping 252 * is counted separately 253 * 254 * Also, many kernel routines increase the page count before a critical 255 * routine so they can be sure the page doesn't go away from under them. 256 */ 257 258 /* 259 * Drop a ref, return true if the refcount fell to zero (the page has no users) 260 */ 261 static inline int put_page_testzero(struct page *page) 262 { 263 VM_BUG_ON(atomic_read(&page->_count) == 0); 264 return atomic_dec_and_test(&page->_count); 265 } 266 267 /* 268 * Try to grab a ref unless the page has a refcount of zero, return false if 269 * that is the case. 270 */ 271 static inline int get_page_unless_zero(struct page *page) 272 { 273 return atomic_inc_not_zero(&page->_count); 274 } 275 276 extern int page_is_ram(unsigned long pfn); 277 278 /* Support for virtually mapped pages */ 279 struct page *vmalloc_to_page(const void *addr); 280 unsigned long vmalloc_to_pfn(const void *addr); 281 282 /* 283 * Determine if an address is within the vmalloc range 284 * 285 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there 286 * is no special casing required. 287 */ 288 static inline int is_vmalloc_addr(const void *x) 289 { 290 #ifdef CONFIG_MMU 291 unsigned long addr = (unsigned long)x; 292 293 return addr >= VMALLOC_START && addr < VMALLOC_END; 294 #else 295 return 0; 296 #endif 297 } 298 #ifdef CONFIG_MMU 299 extern int is_vmalloc_or_module_addr(const void *x); 300 #else 301 static inline int is_vmalloc_or_module_addr(const void *x) 302 { 303 return 0; 304 } 305 #endif 306 307 static inline struct page *compound_head(struct page *page) 308 { 309 if (unlikely(PageTail(page))) 310 return page->first_page; 311 return page; 312 } 313 314 static inline int page_count(struct page *page) 315 { 316 return atomic_read(&compound_head(page)->_count); 317 } 318 319 static inline void get_page(struct page *page) 320 { 321 page = compound_head(page); 322 VM_BUG_ON(atomic_read(&page->_count) == 0); 323 atomic_inc(&page->_count); 324 } 325 326 static inline struct page *virt_to_head_page(const void *x) 327 { 328 struct page *page = virt_to_page(x); 329 return compound_head(page); 330 } 331 332 /* 333 * Setup the page count before being freed into the page allocator for 334 * the first time (boot or memory hotplug) 335 */ 336 static inline void init_page_count(struct page *page) 337 { 338 atomic_set(&page->_count, 1); 339 } 340 341 void put_page(struct page *page); 342 void put_pages_list(struct list_head *pages); 343 344 void split_page(struct page *page, unsigned int order); 345 int split_free_page(struct page *page); 346 347 /* 348 * Compound pages have a destructor function. Provide a 349 * prototype for that function and accessor functions. 350 * These are _only_ valid on the head of a PG_compound page. 351 */ 352 typedef void compound_page_dtor(struct page *); 353 354 static inline void set_compound_page_dtor(struct page *page, 355 compound_page_dtor *dtor) 356 { 357 page[1].lru.next = (void *)dtor; 358 } 359 360 static inline compound_page_dtor *get_compound_page_dtor(struct page *page) 361 { 362 return (compound_page_dtor *)page[1].lru.next; 363 } 364 365 static inline int compound_order(struct page *page) 366 { 367 if (!PageHead(page)) 368 return 0; 369 return (unsigned long)page[1].lru.prev; 370 } 371 372 static inline void set_compound_order(struct page *page, unsigned long order) 373 { 374 page[1].lru.prev = (void *)order; 375 } 376 377 /* 378 * Multiple processes may "see" the same page. E.g. for untouched 379 * mappings of /dev/null, all processes see the same page full of 380 * zeroes, and text pages of executables and shared libraries have 381 * only one copy in memory, at most, normally. 382 * 383 * For the non-reserved pages, page_count(page) denotes a reference count. 384 * page_count() == 0 means the page is free. page->lru is then used for 385 * freelist management in the buddy allocator. 386 * page_count() > 0 means the page has been allocated. 387 * 388 * Pages are allocated by the slab allocator in order to provide memory 389 * to kmalloc and kmem_cache_alloc. In this case, the management of the 390 * page, and the fields in 'struct page' are the responsibility of mm/slab.c 391 * unless a particular usage is carefully commented. (the responsibility of 392 * freeing the kmalloc memory is the caller's, of course). 393 * 394 * A page may be used by anyone else who does a __get_free_page(). 395 * In this case, page_count still tracks the references, and should only 396 * be used through the normal accessor functions. The top bits of page->flags 397 * and page->virtual store page management information, but all other fields 398 * are unused and could be used privately, carefully. The management of this 399 * page is the responsibility of the one who allocated it, and those who have 400 * subsequently been given references to it. 401 * 402 * The other pages (we may call them "pagecache pages") are completely 403 * managed by the Linux memory manager: I/O, buffers, swapping etc. 404 * The following discussion applies only to them. 405 * 406 * A pagecache page contains an opaque `private' member, which belongs to the 407 * page's address_space. Usually, this is the address of a circular list of 408 * the page's disk buffers. PG_private must be set to tell the VM to call 409 * into the filesystem to release these pages. 410 * 411 * A page may belong to an inode's memory mapping. In this case, page->mapping 412 * is the pointer to the inode, and page->index is the file offset of the page, 413 * in units of PAGE_CACHE_SIZE. 414 * 415 * If pagecache pages are not associated with an inode, they are said to be 416 * anonymous pages. These may become associated with the swapcache, and in that 417 * case PG_swapcache is set, and page->private is an offset into the swapcache. 418 * 419 * In either case (swapcache or inode backed), the pagecache itself holds one 420 * reference to the page. Setting PG_private should also increment the 421 * refcount. The each user mapping also has a reference to the page. 422 * 423 * The pagecache pages are stored in a per-mapping radix tree, which is 424 * rooted at mapping->page_tree, and indexed by offset. 425 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space 426 * lists, we instead now tag pages as dirty/writeback in the radix tree. 427 * 428 * All pagecache pages may be subject to I/O: 429 * - inode pages may need to be read from disk, 430 * - inode pages which have been modified and are MAP_SHARED may need 431 * to be written back to the inode on disk, 432 * - anonymous pages (including MAP_PRIVATE file mappings) which have been 433 * modified may need to be swapped out to swap space and (later) to be read 434 * back into memory. 435 */ 436 437 /* 438 * The zone field is never updated after free_area_init_core() 439 * sets it, so none of the operations on it need to be atomic. 440 */ 441 442 443 /* 444 * page->flags layout: 445 * 446 * There are three possibilities for how page->flags get 447 * laid out. The first is for the normal case, without 448 * sparsemem. The second is for sparsemem when there is 449 * plenty of space for node and section. The last is when 450 * we have run out of space and have to fall back to an 451 * alternate (slower) way of determining the node. 452 * 453 * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS | 454 * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS | 455 * classic sparse no space for node: | SECTION | ZONE | ... | FLAGS | 456 */ 457 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) 458 #define SECTIONS_WIDTH SECTIONS_SHIFT 459 #else 460 #define SECTIONS_WIDTH 0 461 #endif 462 463 #define ZONES_WIDTH ZONES_SHIFT 464 465 #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS 466 #define NODES_WIDTH NODES_SHIFT 467 #else 468 #ifdef CONFIG_SPARSEMEM_VMEMMAP 469 #error "Vmemmap: No space for nodes field in page flags" 470 #endif 471 #define NODES_WIDTH 0 472 #endif 473 474 /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */ 475 #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) 476 #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) 477 #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) 478 479 /* 480 * We are going to use the flags for the page to node mapping if its in 481 * there. This includes the case where there is no node, so it is implicit. 482 */ 483 #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0) 484 #define NODE_NOT_IN_PAGE_FLAGS 485 #endif 486 487 #ifndef PFN_SECTION_SHIFT 488 #define PFN_SECTION_SHIFT 0 489 #endif 490 491 /* 492 * Define the bit shifts to access each section. For non-existant 493 * sections we define the shift as 0; that plus a 0 mask ensures 494 * the compiler will optimise away reference to them. 495 */ 496 #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) 497 #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) 498 #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) 499 500 /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ 501 #ifdef NODE_NOT_IN_PAGE_FLAGS 502 #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) 503 #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ 504 SECTIONS_PGOFF : ZONES_PGOFF) 505 #else 506 #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) 507 #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ 508 NODES_PGOFF : ZONES_PGOFF) 509 #endif 510 511 #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) 512 513 #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS 514 #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS 515 #endif 516 517 #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) 518 #define NODES_MASK ((1UL << NODES_WIDTH) - 1) 519 #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) 520 #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) 521 522 static inline enum zone_type page_zonenum(struct page *page) 523 { 524 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; 525 } 526 527 /* 528 * The identification function is only used by the buddy allocator for 529 * determining if two pages could be buddies. We are not really 530 * identifying a zone since we could be using a the section number 531 * id if we have not node id available in page flags. 532 * We guarantee only that it will return the same value for two 533 * combinable pages in a zone. 534 */ 535 static inline int page_zone_id(struct page *page) 536 { 537 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; 538 } 539 540 static inline int zone_to_nid(struct zone *zone) 541 { 542 #ifdef CONFIG_NUMA 543 return zone->node; 544 #else 545 return 0; 546 #endif 547 } 548 549 #ifdef NODE_NOT_IN_PAGE_FLAGS 550 extern int page_to_nid(struct page *page); 551 #else 552 static inline int page_to_nid(struct page *page) 553 { 554 return (page->flags >> NODES_PGSHIFT) & NODES_MASK; 555 } 556 #endif 557 558 static inline struct zone *page_zone(struct page *page) 559 { 560 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; 561 } 562 563 #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) 564 static inline unsigned long page_to_section(struct page *page) 565 { 566 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; 567 } 568 #endif 569 570 static inline void set_page_zone(struct page *page, enum zone_type zone) 571 { 572 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); 573 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; 574 } 575 576 static inline void set_page_node(struct page *page, unsigned long node) 577 { 578 page->flags &= ~(NODES_MASK << NODES_PGSHIFT); 579 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; 580 } 581 582 static inline void set_page_section(struct page *page, unsigned long section) 583 { 584 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); 585 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; 586 } 587 588 static inline void set_page_links(struct page *page, enum zone_type zone, 589 unsigned long node, unsigned long pfn) 590 { 591 set_page_zone(page, zone); 592 set_page_node(page, node); 593 set_page_section(page, pfn_to_section_nr(pfn)); 594 } 595 596 /* 597 * Some inline functions in vmstat.h depend on page_zone() 598 */ 599 #include <linux/vmstat.h> 600 601 static __always_inline void *lowmem_page_address(struct page *page) 602 { 603 return __va(PFN_PHYS(page_to_pfn(page))); 604 } 605 606 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) 607 #define HASHED_PAGE_VIRTUAL 608 #endif 609 610 #if defined(WANT_PAGE_VIRTUAL) 611 #define page_address(page) ((page)->virtual) 612 #define set_page_address(page, address) \ 613 do { \ 614 (page)->virtual = (address); \ 615 } while(0) 616 #define page_address_init() do { } while(0) 617 #endif 618 619 #if defined(HASHED_PAGE_VIRTUAL) 620 void *page_address(struct page *page); 621 void set_page_address(struct page *page, void *virtual); 622 void page_address_init(void); 623 #endif 624 625 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) 626 #define page_address(page) lowmem_page_address(page) 627 #define set_page_address(page, address) do { } while(0) 628 #define page_address_init() do { } while(0) 629 #endif 630 631 /* 632 * On an anonymous page mapped into a user virtual memory area, 633 * page->mapping points to its anon_vma, not to a struct address_space; 634 * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. 635 * 636 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled, 637 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit; 638 * and then page->mapping points, not to an anon_vma, but to a private 639 * structure which KSM associates with that merged page. See ksm.h. 640 * 641 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used. 642 * 643 * Please note that, confusingly, "page_mapping" refers to the inode 644 * address_space which maps the page from disk; whereas "page_mapped" 645 * refers to user virtual address space into which the page is mapped. 646 */ 647 #define PAGE_MAPPING_ANON 1 648 #define PAGE_MAPPING_KSM 2 649 #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM) 650 651 extern struct address_space swapper_space; 652 static inline struct address_space *page_mapping(struct page *page) 653 { 654 struct address_space *mapping = page->mapping; 655 656 VM_BUG_ON(PageSlab(page)); 657 if (unlikely(PageSwapCache(page))) 658 mapping = &swapper_space; 659 else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON)) 660 mapping = NULL; 661 return mapping; 662 } 663 664 /* Neutral page->mapping pointer to address_space or anon_vma or other */ 665 static inline void *page_rmapping(struct page *page) 666 { 667 return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS); 668 } 669 670 static inline int PageAnon(struct page *page) 671 { 672 return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; 673 } 674 675 /* 676 * Return the pagecache index of the passed page. Regular pagecache pages 677 * use ->index whereas swapcache pages use ->private 678 */ 679 static inline pgoff_t page_index(struct page *page) 680 { 681 if (unlikely(PageSwapCache(page))) 682 return page_private(page); 683 return page->index; 684 } 685 686 /* 687 * The atomic page->_mapcount, like _count, starts from -1: 688 * so that transitions both from it and to it can be tracked, 689 * using atomic_inc_and_test and atomic_add_negative(-1). 690 */ 691 static inline void reset_page_mapcount(struct page *page) 692 { 693 atomic_set(&(page)->_mapcount, -1); 694 } 695 696 static inline int page_mapcount(struct page *page) 697 { 698 return atomic_read(&(page)->_mapcount) + 1; 699 } 700 701 /* 702 * Return true if this page is mapped into pagetables. 703 */ 704 static inline int page_mapped(struct page *page) 705 { 706 return atomic_read(&(page)->_mapcount) >= 0; 707 } 708 709 /* 710 * Different kinds of faults, as returned by handle_mm_fault(). 711 * Used to decide whether a process gets delivered SIGBUS or 712 * just gets major/minor fault counters bumped up. 713 */ 714 715 #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ 716 717 #define VM_FAULT_OOM 0x0001 718 #define VM_FAULT_SIGBUS 0x0002 719 #define VM_FAULT_MAJOR 0x0004 720 #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ 721 #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ 722 #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ 723 724 #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ 725 #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ 726 727 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ 728 729 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \ 730 VM_FAULT_HWPOISON_LARGE) 731 732 /* Encode hstate index for a hwpoisoned large page */ 733 #define VM_FAULT_SET_HINDEX(x) ((x) << 12) 734 #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) 735 736 /* 737 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. 738 */ 739 extern void pagefault_out_of_memory(void); 740 741 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) 742 743 extern void show_free_areas(void); 744 745 int shmem_lock(struct file *file, int lock, struct user_struct *user); 746 struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags); 747 int shmem_zero_setup(struct vm_area_struct *); 748 749 #ifndef CONFIG_MMU 750 extern unsigned long shmem_get_unmapped_area(struct file *file, 751 unsigned long addr, 752 unsigned long len, 753 unsigned long pgoff, 754 unsigned long flags); 755 #endif 756 757 extern int can_do_mlock(void); 758 extern int user_shm_lock(size_t, struct user_struct *); 759 extern void user_shm_unlock(size_t, struct user_struct *); 760 761 /* 762 * Parameter block passed down to zap_pte_range in exceptional cases. 763 */ 764 struct zap_details { 765 struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ 766 struct address_space *check_mapping; /* Check page->mapping if set */ 767 pgoff_t first_index; /* Lowest page->index to unmap */ 768 pgoff_t last_index; /* Highest page->index to unmap */ 769 spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */ 770 unsigned long truncate_count; /* Compare vm_truncate_count */ 771 }; 772 773 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, 774 pte_t pte); 775 776 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, 777 unsigned long size); 778 unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address, 779 unsigned long size, struct zap_details *); 780 unsigned long unmap_vmas(struct mmu_gather **tlb, 781 struct vm_area_struct *start_vma, unsigned long start_addr, 782 unsigned long end_addr, unsigned long *nr_accounted, 783 struct zap_details *); 784 785 /** 786 * mm_walk - callbacks for walk_page_range 787 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry 788 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry 789 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry 790 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry 791 * @pte_hole: if set, called for each hole at all levels 792 * @hugetlb_entry: if set, called for each hugetlb entry 793 * 794 * (see walk_page_range for more details) 795 */ 796 struct mm_walk { 797 int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *); 798 int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *); 799 int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *); 800 int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *); 801 int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *); 802 int (*hugetlb_entry)(pte_t *, unsigned long, 803 unsigned long, unsigned long, struct mm_walk *); 804 struct mm_struct *mm; 805 void *private; 806 }; 807 808 int walk_page_range(unsigned long addr, unsigned long end, 809 struct mm_walk *walk); 810 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, 811 unsigned long end, unsigned long floor, unsigned long ceiling); 812 int copy_page_range(struct mm_struct *dst, struct mm_struct *src, 813 struct vm_area_struct *vma); 814 void unmap_mapping_range(struct address_space *mapping, 815 loff_t const holebegin, loff_t const holelen, int even_cows); 816 int follow_pfn(struct vm_area_struct *vma, unsigned long address, 817 unsigned long *pfn); 818 int follow_phys(struct vm_area_struct *vma, unsigned long address, 819 unsigned int flags, unsigned long *prot, resource_size_t *phys); 820 int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, 821 void *buf, int len, int write); 822 823 static inline void unmap_shared_mapping_range(struct address_space *mapping, 824 loff_t const holebegin, loff_t const holelen) 825 { 826 unmap_mapping_range(mapping, holebegin, holelen, 0); 827 } 828 829 extern void truncate_pagecache(struct inode *inode, loff_t old, loff_t new); 830 extern void truncate_setsize(struct inode *inode, loff_t newsize); 831 extern int vmtruncate(struct inode *inode, loff_t offset); 832 extern int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end); 833 834 int truncate_inode_page(struct address_space *mapping, struct page *page); 835 int generic_error_remove_page(struct address_space *mapping, struct page *page); 836 837 int invalidate_inode_page(struct page *page); 838 839 #ifdef CONFIG_MMU 840 extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, 841 unsigned long address, unsigned int flags); 842 #else 843 static inline int handle_mm_fault(struct mm_struct *mm, 844 struct vm_area_struct *vma, unsigned long address, 845 unsigned int flags) 846 { 847 /* should never happen if there's no MMU */ 848 BUG(); 849 return VM_FAULT_SIGBUS; 850 } 851 #endif 852 853 extern int make_pages_present(unsigned long addr, unsigned long end); 854 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); 855 856 int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, 857 unsigned long start, int nr_pages, int write, int force, 858 struct page **pages, struct vm_area_struct **vmas); 859 int get_user_pages_fast(unsigned long start, int nr_pages, int write, 860 struct page **pages); 861 struct page *get_dump_page(unsigned long addr); 862 863 extern int try_to_release_page(struct page * page, gfp_t gfp_mask); 864 extern void do_invalidatepage(struct page *page, unsigned long offset); 865 866 int __set_page_dirty_nobuffers(struct page *page); 867 int __set_page_dirty_no_writeback(struct page *page); 868 int redirty_page_for_writepage(struct writeback_control *wbc, 869 struct page *page); 870 void account_page_dirtied(struct page *page, struct address_space *mapping); 871 void account_page_writeback(struct page *page); 872 int set_page_dirty(struct page *page); 873 int set_page_dirty_lock(struct page *page); 874 int clear_page_dirty_for_io(struct page *page); 875 876 /* Is the vma a continuation of the stack vma above it? */ 877 static inline int vma_stack_continue(struct vm_area_struct *vma, unsigned long addr) 878 { 879 return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); 880 } 881 882 extern unsigned long move_page_tables(struct vm_area_struct *vma, 883 unsigned long old_addr, struct vm_area_struct *new_vma, 884 unsigned long new_addr, unsigned long len); 885 extern unsigned long do_mremap(unsigned long addr, 886 unsigned long old_len, unsigned long new_len, 887 unsigned long flags, unsigned long new_addr); 888 extern int mprotect_fixup(struct vm_area_struct *vma, 889 struct vm_area_struct **pprev, unsigned long start, 890 unsigned long end, unsigned long newflags); 891 892 /* 893 * doesn't attempt to fault and will return short. 894 */ 895 int __get_user_pages_fast(unsigned long start, int nr_pages, int write, 896 struct page **pages); 897 /* 898 * per-process(per-mm_struct) statistics. 899 */ 900 #if defined(SPLIT_RSS_COUNTING) 901 /* 902 * The mm counters are not protected by its page_table_lock, 903 * so must be incremented atomically. 904 */ 905 static inline void set_mm_counter(struct mm_struct *mm, int member, long value) 906 { 907 atomic_long_set(&mm->rss_stat.count[member], value); 908 } 909 910 unsigned long get_mm_counter(struct mm_struct *mm, int member); 911 912 static inline void add_mm_counter(struct mm_struct *mm, int member, long value) 913 { 914 atomic_long_add(value, &mm->rss_stat.count[member]); 915 } 916 917 static inline void inc_mm_counter(struct mm_struct *mm, int member) 918 { 919 atomic_long_inc(&mm->rss_stat.count[member]); 920 } 921 922 static inline void dec_mm_counter(struct mm_struct *mm, int member) 923 { 924 atomic_long_dec(&mm->rss_stat.count[member]); 925 } 926 927 #else /* !USE_SPLIT_PTLOCKS */ 928 /* 929 * The mm counters are protected by its page_table_lock, 930 * so can be incremented directly. 931 */ 932 static inline void set_mm_counter(struct mm_struct *mm, int member, long value) 933 { 934 mm->rss_stat.count[member] = value; 935 } 936 937 static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) 938 { 939 return mm->rss_stat.count[member]; 940 } 941 942 static inline void add_mm_counter(struct mm_struct *mm, int member, long value) 943 { 944 mm->rss_stat.count[member] += value; 945 } 946 947 static inline void inc_mm_counter(struct mm_struct *mm, int member) 948 { 949 mm->rss_stat.count[member]++; 950 } 951 952 static inline void dec_mm_counter(struct mm_struct *mm, int member) 953 { 954 mm->rss_stat.count[member]--; 955 } 956 957 #endif /* !USE_SPLIT_PTLOCKS */ 958 959 static inline unsigned long get_mm_rss(struct mm_struct *mm) 960 { 961 return get_mm_counter(mm, MM_FILEPAGES) + 962 get_mm_counter(mm, MM_ANONPAGES); 963 } 964 965 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) 966 { 967 return max(mm->hiwater_rss, get_mm_rss(mm)); 968 } 969 970 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) 971 { 972 return max(mm->hiwater_vm, mm->total_vm); 973 } 974 975 static inline void update_hiwater_rss(struct mm_struct *mm) 976 { 977 unsigned long _rss = get_mm_rss(mm); 978 979 if ((mm)->hiwater_rss < _rss) 980 (mm)->hiwater_rss = _rss; 981 } 982 983 static inline void update_hiwater_vm(struct mm_struct *mm) 984 { 985 if (mm->hiwater_vm < mm->total_vm) 986 mm->hiwater_vm = mm->total_vm; 987 } 988 989 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, 990 struct mm_struct *mm) 991 { 992 unsigned long hiwater_rss = get_mm_hiwater_rss(mm); 993 994 if (*maxrss < hiwater_rss) 995 *maxrss = hiwater_rss; 996 } 997 998 #if defined(SPLIT_RSS_COUNTING) 999 void sync_mm_rss(struct task_struct *task, struct mm_struct *mm); 1000 #else 1001 static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm) 1002 { 1003 } 1004 #endif 1005 1006 /* 1007 * A callback you can register to apply pressure to ageable caches. 1008 * 1009 * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should 1010 * look through the least-recently-used 'nr_to_scan' entries and 1011 * attempt to free them up. It should return the number of objects 1012 * which remain in the cache. If it returns -1, it means it cannot do 1013 * any scanning at this time (eg. there is a risk of deadlock). 1014 * 1015 * The 'gfpmask' refers to the allocation we are currently trying to 1016 * fulfil. 1017 * 1018 * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is 1019 * querying the cache size, so a fastpath for that case is appropriate. 1020 */ 1021 struct shrinker { 1022 int (*shrink)(struct shrinker *, int nr_to_scan, gfp_t gfp_mask); 1023 int seeks; /* seeks to recreate an obj */ 1024 1025 /* These are for internal use */ 1026 struct list_head list; 1027 long nr; /* objs pending delete */ 1028 }; 1029 #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */ 1030 extern void register_shrinker(struct shrinker *); 1031 extern void unregister_shrinker(struct shrinker *); 1032 1033 int vma_wants_writenotify(struct vm_area_struct *vma); 1034 1035 extern pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl); 1036 1037 #ifdef __PAGETABLE_PUD_FOLDED 1038 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, 1039 unsigned long address) 1040 { 1041 return 0; 1042 } 1043 #else 1044 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); 1045 #endif 1046 1047 #ifdef __PAGETABLE_PMD_FOLDED 1048 static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, 1049 unsigned long address) 1050 { 1051 return 0; 1052 } 1053 #else 1054 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); 1055 #endif 1056 1057 int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); 1058 int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); 1059 1060 /* 1061 * The following ifdef needed to get the 4level-fixup.h header to work. 1062 * Remove it when 4level-fixup.h has been removed. 1063 */ 1064 #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) 1065 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) 1066 { 1067 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? 1068 NULL: pud_offset(pgd, address); 1069 } 1070 1071 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) 1072 { 1073 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? 1074 NULL: pmd_offset(pud, address); 1075 } 1076 #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ 1077 1078 #if USE_SPLIT_PTLOCKS 1079 /* 1080 * We tuck a spinlock to guard each pagetable page into its struct page, 1081 * at page->private, with BUILD_BUG_ON to make sure that this will not 1082 * overflow into the next struct page (as it might with DEBUG_SPINLOCK). 1083 * When freeing, reset page->mapping so free_pages_check won't complain. 1084 */ 1085 #define __pte_lockptr(page) &((page)->ptl) 1086 #define pte_lock_init(_page) do { \ 1087 spin_lock_init(__pte_lockptr(_page)); \ 1088 } while (0) 1089 #define pte_lock_deinit(page) ((page)->mapping = NULL) 1090 #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));}) 1091 #else /* !USE_SPLIT_PTLOCKS */ 1092 /* 1093 * We use mm->page_table_lock to guard all pagetable pages of the mm. 1094 */ 1095 #define pte_lock_init(page) do {} while (0) 1096 #define pte_lock_deinit(page) do {} while (0) 1097 #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;}) 1098 #endif /* USE_SPLIT_PTLOCKS */ 1099 1100 static inline void pgtable_page_ctor(struct page *page) 1101 { 1102 pte_lock_init(page); 1103 inc_zone_page_state(page, NR_PAGETABLE); 1104 } 1105 1106 static inline void pgtable_page_dtor(struct page *page) 1107 { 1108 pte_lock_deinit(page); 1109 dec_zone_page_state(page, NR_PAGETABLE); 1110 } 1111 1112 #define pte_offset_map_lock(mm, pmd, address, ptlp) \ 1113 ({ \ 1114 spinlock_t *__ptl = pte_lockptr(mm, pmd); \ 1115 pte_t *__pte = pte_offset_map(pmd, address); \ 1116 *(ptlp) = __ptl; \ 1117 spin_lock(__ptl); \ 1118 __pte; \ 1119 }) 1120 1121 #define pte_unmap_unlock(pte, ptl) do { \ 1122 spin_unlock(ptl); \ 1123 pte_unmap(pte); \ 1124 } while (0) 1125 1126 #define pte_alloc_map(mm, pmd, address) \ 1127 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ 1128 NULL: pte_offset_map(pmd, address)) 1129 1130 #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ 1131 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ 1132 NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) 1133 1134 #define pte_alloc_kernel(pmd, address) \ 1135 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ 1136 NULL: pte_offset_kernel(pmd, address)) 1137 1138 extern void free_area_init(unsigned long * zones_size); 1139 extern void free_area_init_node(int nid, unsigned long * zones_size, 1140 unsigned long zone_start_pfn, unsigned long *zholes_size); 1141 #ifdef CONFIG_ARCH_POPULATES_NODE_MAP 1142 /* 1143 * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its 1144 * zones, allocate the backing mem_map and account for memory holes in a more 1145 * architecture independent manner. This is a substitute for creating the 1146 * zone_sizes[] and zholes_size[] arrays and passing them to 1147 * free_area_init_node() 1148 * 1149 * An architecture is expected to register range of page frames backed by 1150 * physical memory with add_active_range() before calling 1151 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic 1152 * usage, an architecture is expected to do something like 1153 * 1154 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, 1155 * max_highmem_pfn}; 1156 * for_each_valid_physical_page_range() 1157 * add_active_range(node_id, start_pfn, end_pfn) 1158 * free_area_init_nodes(max_zone_pfns); 1159 * 1160 * If the architecture guarantees that there are no holes in the ranges 1161 * registered with add_active_range(), free_bootmem_active_regions() 1162 * will call free_bootmem_node() for each registered physical page range. 1163 * Similarly sparse_memory_present_with_active_regions() calls 1164 * memory_present() for each range when SPARSEMEM is enabled. 1165 * 1166 * See mm/page_alloc.c for more information on each function exposed by 1167 * CONFIG_ARCH_POPULATES_NODE_MAP 1168 */ 1169 extern void free_area_init_nodes(unsigned long *max_zone_pfn); 1170 extern void add_active_range(unsigned int nid, unsigned long start_pfn, 1171 unsigned long end_pfn); 1172 extern void remove_active_range(unsigned int nid, unsigned long start_pfn, 1173 unsigned long end_pfn); 1174 extern void remove_all_active_ranges(void); 1175 void sort_node_map(void); 1176 unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, 1177 unsigned long end_pfn); 1178 extern unsigned long absent_pages_in_range(unsigned long start_pfn, 1179 unsigned long end_pfn); 1180 extern void get_pfn_range_for_nid(unsigned int nid, 1181 unsigned long *start_pfn, unsigned long *end_pfn); 1182 extern unsigned long find_min_pfn_with_active_regions(void); 1183 extern void free_bootmem_with_active_regions(int nid, 1184 unsigned long max_low_pfn); 1185 int add_from_early_node_map(struct range *range, int az, 1186 int nr_range, int nid); 1187 u64 __init find_memory_core_early(int nid, u64 size, u64 align, 1188 u64 goal, u64 limit); 1189 void *__alloc_memory_core_early(int nodeid, u64 size, u64 align, 1190 u64 goal, u64 limit); 1191 typedef int (*work_fn_t)(unsigned long, unsigned long, void *); 1192 extern void work_with_active_regions(int nid, work_fn_t work_fn, void *data); 1193 extern void sparse_memory_present_with_active_regions(int nid); 1194 #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ 1195 1196 #if !defined(CONFIG_ARCH_POPULATES_NODE_MAP) && \ 1197 !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) 1198 static inline int __early_pfn_to_nid(unsigned long pfn) 1199 { 1200 return 0; 1201 } 1202 #else 1203 /* please see mm/page_alloc.c */ 1204 extern int __meminit early_pfn_to_nid(unsigned long pfn); 1205 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID 1206 /* there is a per-arch backend function. */ 1207 extern int __meminit __early_pfn_to_nid(unsigned long pfn); 1208 #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ 1209 #endif 1210 1211 extern void set_dma_reserve(unsigned long new_dma_reserve); 1212 extern void memmap_init_zone(unsigned long, int, unsigned long, 1213 unsigned long, enum memmap_context); 1214 extern void setup_per_zone_wmarks(void); 1215 extern void calculate_zone_inactive_ratio(struct zone *zone); 1216 extern void mem_init(void); 1217 extern void __init mmap_init(void); 1218 extern void show_mem(void); 1219 extern void si_meminfo(struct sysinfo * val); 1220 extern void si_meminfo_node(struct sysinfo *val, int nid); 1221 extern int after_bootmem; 1222 1223 extern void setup_per_cpu_pageset(void); 1224 1225 extern void zone_pcp_update(struct zone *zone); 1226 1227 /* nommu.c */ 1228 extern atomic_long_t mmap_pages_allocated; 1229 extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); 1230 1231 /* prio_tree.c */ 1232 void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old); 1233 void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *); 1234 void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *); 1235 struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma, 1236 struct prio_tree_iter *iter); 1237 1238 #define vma_prio_tree_foreach(vma, iter, root, begin, end) \ 1239 for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \ 1240 (vma = vma_prio_tree_next(vma, iter)); ) 1241 1242 static inline void vma_nonlinear_insert(struct vm_area_struct *vma, 1243 struct list_head *list) 1244 { 1245 vma->shared.vm_set.parent = NULL; 1246 list_add_tail(&vma->shared.vm_set.list, list); 1247 } 1248 1249 /* mmap.c */ 1250 extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); 1251 extern int vma_adjust(struct vm_area_struct *vma, unsigned long start, 1252 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); 1253 extern struct vm_area_struct *vma_merge(struct mm_struct *, 1254 struct vm_area_struct *prev, unsigned long addr, unsigned long end, 1255 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, 1256 struct mempolicy *); 1257 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); 1258 extern int split_vma(struct mm_struct *, 1259 struct vm_area_struct *, unsigned long addr, int new_below); 1260 extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); 1261 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, 1262 struct rb_node **, struct rb_node *); 1263 extern void unlink_file_vma(struct vm_area_struct *); 1264 extern struct vm_area_struct *copy_vma(struct vm_area_struct **, 1265 unsigned long addr, unsigned long len, pgoff_t pgoff); 1266 extern void exit_mmap(struct mm_struct *); 1267 1268 extern int mm_take_all_locks(struct mm_struct *mm); 1269 extern void mm_drop_all_locks(struct mm_struct *mm); 1270 1271 #ifdef CONFIG_PROC_FS 1272 /* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */ 1273 extern void added_exe_file_vma(struct mm_struct *mm); 1274 extern void removed_exe_file_vma(struct mm_struct *mm); 1275 #else 1276 static inline void added_exe_file_vma(struct mm_struct *mm) 1277 {} 1278 1279 static inline void removed_exe_file_vma(struct mm_struct *mm) 1280 {} 1281 #endif /* CONFIG_PROC_FS */ 1282 1283 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); 1284 extern int install_special_mapping(struct mm_struct *mm, 1285 unsigned long addr, unsigned long len, 1286 unsigned long flags, struct page **pages); 1287 1288 extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); 1289 1290 extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, 1291 unsigned long len, unsigned long prot, 1292 unsigned long flag, unsigned long pgoff); 1293 extern unsigned long mmap_region(struct file *file, unsigned long addr, 1294 unsigned long len, unsigned long flags, 1295 unsigned int vm_flags, unsigned long pgoff); 1296 1297 static inline unsigned long do_mmap(struct file *file, unsigned long addr, 1298 unsigned long len, unsigned long prot, 1299 unsigned long flag, unsigned long offset) 1300 { 1301 unsigned long ret = -EINVAL; 1302 if ((offset + PAGE_ALIGN(len)) < offset) 1303 goto out; 1304 if (!(offset & ~PAGE_MASK)) 1305 ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT); 1306 out: 1307 return ret; 1308 } 1309 1310 extern int do_munmap(struct mm_struct *, unsigned long, size_t); 1311 1312 extern unsigned long do_brk(unsigned long, unsigned long); 1313 1314 /* filemap.c */ 1315 extern unsigned long page_unuse(struct page *); 1316 extern void truncate_inode_pages(struct address_space *, loff_t); 1317 extern void truncate_inode_pages_range(struct address_space *, 1318 loff_t lstart, loff_t lend); 1319 1320 /* generic vm_area_ops exported for stackable file systems */ 1321 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); 1322 1323 /* mm/page-writeback.c */ 1324 int write_one_page(struct page *page, int wait); 1325 void task_dirty_inc(struct task_struct *tsk); 1326 1327 /* readahead.c */ 1328 #define VM_MAX_READAHEAD 128 /* kbytes */ 1329 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ 1330 1331 int force_page_cache_readahead(struct address_space *mapping, struct file *filp, 1332 pgoff_t offset, unsigned long nr_to_read); 1333 1334 void page_cache_sync_readahead(struct address_space *mapping, 1335 struct file_ra_state *ra, 1336 struct file *filp, 1337 pgoff_t offset, 1338 unsigned long size); 1339 1340 void page_cache_async_readahead(struct address_space *mapping, 1341 struct file_ra_state *ra, 1342 struct file *filp, 1343 struct page *pg, 1344 pgoff_t offset, 1345 unsigned long size); 1346 1347 unsigned long max_sane_readahead(unsigned long nr); 1348 unsigned long ra_submit(struct file_ra_state *ra, 1349 struct address_space *mapping, 1350 struct file *filp); 1351 1352 /* Do stack extension */ 1353 extern int expand_stack(struct vm_area_struct *vma, unsigned long address); 1354 #if VM_GROWSUP 1355 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); 1356 #else 1357 #define expand_upwards(vma, address) do { } while (0) 1358 #endif 1359 extern int expand_stack_downwards(struct vm_area_struct *vma, 1360 unsigned long address); 1361 1362 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ 1363 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); 1364 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, 1365 struct vm_area_struct **pprev); 1366 1367 /* Look up the first VMA which intersects the interval start_addr..end_addr-1, 1368 NULL if none. Assume start_addr < end_addr. */ 1369 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) 1370 { 1371 struct vm_area_struct * vma = find_vma(mm,start_addr); 1372 1373 if (vma && end_addr <= vma->vm_start) 1374 vma = NULL; 1375 return vma; 1376 } 1377 1378 static inline unsigned long vma_pages(struct vm_area_struct *vma) 1379 { 1380 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; 1381 } 1382 1383 #ifdef CONFIG_MMU 1384 pgprot_t vm_get_page_prot(unsigned long vm_flags); 1385 #else 1386 static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) 1387 { 1388 return __pgprot(0); 1389 } 1390 #endif 1391 1392 struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); 1393 int remap_pfn_range(struct vm_area_struct *, unsigned long addr, 1394 unsigned long pfn, unsigned long size, pgprot_t); 1395 int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); 1396 int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, 1397 unsigned long pfn); 1398 int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, 1399 unsigned long pfn); 1400 1401 struct page *follow_page(struct vm_area_struct *, unsigned long address, 1402 unsigned int foll_flags); 1403 #define FOLL_WRITE 0x01 /* check pte is writable */ 1404 #define FOLL_TOUCH 0x02 /* mark page accessed */ 1405 #define FOLL_GET 0x04 /* do get_page on page */ 1406 #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ 1407 #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ 1408 1409 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, 1410 void *data); 1411 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, 1412 unsigned long size, pte_fn_t fn, void *data); 1413 1414 #ifdef CONFIG_PROC_FS 1415 void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); 1416 #else 1417 static inline void vm_stat_account(struct mm_struct *mm, 1418 unsigned long flags, struct file *file, long pages) 1419 { 1420 } 1421 #endif /* CONFIG_PROC_FS */ 1422 1423 #ifdef CONFIG_DEBUG_PAGEALLOC 1424 extern int debug_pagealloc_enabled; 1425 1426 extern void kernel_map_pages(struct page *page, int numpages, int enable); 1427 1428 static inline void enable_debug_pagealloc(void) 1429 { 1430 debug_pagealloc_enabled = 1; 1431 } 1432 #ifdef CONFIG_HIBERNATION 1433 extern bool kernel_page_present(struct page *page); 1434 #endif /* CONFIG_HIBERNATION */ 1435 #else 1436 static inline void 1437 kernel_map_pages(struct page *page, int numpages, int enable) {} 1438 static inline void enable_debug_pagealloc(void) 1439 { 1440 } 1441 #ifdef CONFIG_HIBERNATION 1442 static inline bool kernel_page_present(struct page *page) { return true; } 1443 #endif /* CONFIG_HIBERNATION */ 1444 #endif 1445 1446 extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk); 1447 #ifdef __HAVE_ARCH_GATE_AREA 1448 int in_gate_area_no_task(unsigned long addr); 1449 int in_gate_area(struct task_struct *task, unsigned long addr); 1450 #else 1451 int in_gate_area_no_task(unsigned long addr); 1452 #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);}) 1453 #endif /* __HAVE_ARCH_GATE_AREA */ 1454 1455 int drop_caches_sysctl_handler(struct ctl_table *, int, 1456 void __user *, size_t *, loff_t *); 1457 unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask, 1458 unsigned long lru_pages); 1459 1460 #ifndef CONFIG_MMU 1461 #define randomize_va_space 0 1462 #else 1463 extern int randomize_va_space; 1464 #endif 1465 1466 const char * arch_vma_name(struct vm_area_struct *vma); 1467 void print_vma_addr(char *prefix, unsigned long rip); 1468 1469 void sparse_mem_maps_populate_node(struct page **map_map, 1470 unsigned long pnum_begin, 1471 unsigned long pnum_end, 1472 unsigned long map_count, 1473 int nodeid); 1474 1475 struct page *sparse_mem_map_populate(unsigned long pnum, int nid); 1476 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); 1477 pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); 1478 pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); 1479 pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); 1480 void *vmemmap_alloc_block(unsigned long size, int node); 1481 void *vmemmap_alloc_block_buf(unsigned long size, int node); 1482 void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); 1483 int vmemmap_populate_basepages(struct page *start_page, 1484 unsigned long pages, int node); 1485 int vmemmap_populate(struct page *start_page, unsigned long pages, int node); 1486 void vmemmap_populate_print_last(void); 1487 1488 1489 enum mf_flags { 1490 MF_COUNT_INCREASED = 1 << 0, 1491 }; 1492 extern void memory_failure(unsigned long pfn, int trapno); 1493 extern int __memory_failure(unsigned long pfn, int trapno, int flags); 1494 extern int unpoison_memory(unsigned long pfn); 1495 extern int sysctl_memory_failure_early_kill; 1496 extern int sysctl_memory_failure_recovery; 1497 extern void shake_page(struct page *p, int access); 1498 extern atomic_long_t mce_bad_pages; 1499 extern int soft_offline_page(struct page *page, int flags); 1500 #ifdef CONFIG_MEMORY_FAILURE 1501 int is_hwpoison_address(unsigned long addr); 1502 #else 1503 static inline int is_hwpoison_address(unsigned long addr) 1504 { 1505 return 0; 1506 } 1507 #endif 1508 1509 extern void dump_page(struct page *page); 1510 1511 #endif /* __KERNEL__ */ 1512 #endif /* _LINUX_MM_H */ 1513