| 1 | #ifndef _LINUX_MM_H |
| 2 | #define _LINUX_MM_H |
| 3 | |
| 4 | #include <linux/errno.h> |
| 5 | |
| 6 | #ifdef __KERNEL__ |
| 7 | |
| 8 | #include <linux/mmdebug.h> |
| 9 | #include <linux/gfp.h> |
| 10 | #include <linux/bug.h> |
| 11 | #include <linux/list.h> |
| 12 | #include <linux/mmzone.h> |
| 13 | #include <linux/rbtree.h> |
| 14 | #include <linux/atomic.h> |
| 15 | #include <linux/debug_locks.h> |
| 16 | #include <linux/mm_types.h> |
| 17 | #include <linux/range.h> |
| 18 | #include <linux/pfn.h> |
| 19 | #include <linux/bit_spinlock.h> |
| 20 | #include <linux/shrinker.h> |
| 21 | |
| 22 | struct mempolicy; |
| 23 | struct anon_vma; |
| 24 | struct anon_vma_chain; |
| 25 | struct file_ra_state; |
| 26 | struct user_struct; |
| 27 | struct writeback_control; |
| 28 | |
| 29 | #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */ |
| 30 | extern unsigned long max_mapnr; |
| 31 | |
| 32 | static inline void set_max_mapnr(unsigned long limit) |
| 33 | { |
| 34 | max_mapnr = limit; |
| 35 | } |
| 36 | #else |
| 37 | static inline void set_max_mapnr(unsigned long limit) { } |
| 38 | #endif |
| 39 | |
| 40 | extern unsigned long totalram_pages; |
| 41 | extern void * high_memory; |
| 42 | extern int page_cluster; |
| 43 | |
| 44 | #ifdef CONFIG_SYSCTL |
| 45 | extern int sysctl_legacy_va_layout; |
| 46 | #else |
| 47 | #define sysctl_legacy_va_layout 0 |
| 48 | #endif |
| 49 | |
| 50 | #include <asm/page.h> |
| 51 | #include <asm/pgtable.h> |
| 52 | #include <asm/processor.h> |
| 53 | |
| 54 | #ifndef __pa_symbol |
| 55 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) |
| 56 | #endif |
| 57 | |
| 58 | extern unsigned long sysctl_user_reserve_kbytes; |
| 59 | extern unsigned long sysctl_admin_reserve_kbytes; |
| 60 | |
| 61 | extern int sysctl_overcommit_memory; |
| 62 | extern int sysctl_overcommit_ratio; |
| 63 | extern unsigned long sysctl_overcommit_kbytes; |
| 64 | |
| 65 | extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *, |
| 66 | size_t *, loff_t *); |
| 67 | extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, |
| 68 | size_t *, loff_t *); |
| 69 | |
| 70 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
| 71 | |
| 72 | /* to align the pointer to the (next) page boundary */ |
| 73 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) |
| 74 | |
| 75 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
| 76 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE) |
| 77 | |
| 78 | /* |
| 79 | * Linux kernel virtual memory manager primitives. |
| 80 | * The idea being to have a "virtual" mm in the same way |
| 81 | * we have a virtual fs - giving a cleaner interface to the |
| 82 | * mm details, and allowing different kinds of memory mappings |
| 83 | * (from shared memory to executable loading to arbitrary |
| 84 | * mmap() functions). |
| 85 | */ |
| 86 | |
| 87 | extern struct kmem_cache *vm_area_cachep; |
| 88 | |
| 89 | #ifndef CONFIG_MMU |
| 90 | extern struct rb_root nommu_region_tree; |
| 91 | extern struct rw_semaphore nommu_region_sem; |
| 92 | |
| 93 | extern unsigned int kobjsize(const void *objp); |
| 94 | #endif |
| 95 | |
| 96 | /* |
| 97 | * vm_flags in vm_area_struct, see mm_types.h. |
| 98 | */ |
| 99 | #define VM_NONE 0x00000000 |
| 100 | |
| 101 | #define VM_READ 0x00000001 /* currently active flags */ |
| 102 | #define VM_WRITE 0x00000002 |
| 103 | #define VM_EXEC 0x00000004 |
| 104 | #define VM_SHARED 0x00000008 |
| 105 | |
| 106 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
| 107 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
| 108 | #define VM_MAYWRITE 0x00000020 |
| 109 | #define VM_MAYEXEC 0x00000040 |
| 110 | #define VM_MAYSHARE 0x00000080 |
| 111 | |
| 112 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ |
| 113 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
| 114 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
| 115 | |
| 116 | #define VM_LOCKED 0x00002000 |
| 117 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ |
| 118 | |
| 119 | /* Used by sys_madvise() */ |
| 120 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ |
| 121 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ |
| 122 | |
| 123 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ |
| 124 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ |
| 125 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
| 126 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
| 127 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
| 128 | #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */ |
| 129 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
| 130 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
| 131 | |
| 132 | #ifdef CONFIG_MEM_SOFT_DIRTY |
| 133 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ |
| 134 | #else |
| 135 | # define VM_SOFTDIRTY 0 |
| 136 | #endif |
| 137 | |
| 138 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
| 139 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
| 140 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ |
| 141 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
| 142 | |
| 143 | #if defined(CONFIG_X86) |
| 144 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ |
| 145 | #elif defined(CONFIG_PPC) |
| 146 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ |
| 147 | #elif defined(CONFIG_PARISC) |
| 148 | # define VM_GROWSUP VM_ARCH_1 |
| 149 | #elif defined(CONFIG_METAG) |
| 150 | # define VM_GROWSUP VM_ARCH_1 |
| 151 | #elif defined(CONFIG_IA64) |
| 152 | # define VM_GROWSUP VM_ARCH_1 |
| 153 | #elif !defined(CONFIG_MMU) |
| 154 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ |
| 155 | #endif |
| 156 | |
| 157 | #ifndef VM_GROWSUP |
| 158 | # define VM_GROWSUP VM_NONE |
| 159 | #endif |
| 160 | |
| 161 | /* Bits set in the VMA until the stack is in its final location */ |
| 162 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) |
| 163 | |
| 164 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
| 165 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS |
| 166 | #endif |
| 167 | |
| 168 | #ifdef CONFIG_STACK_GROWSUP |
| 169 | #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
| 170 | #else |
| 171 | #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
| 172 | #endif |
| 173 | |
| 174 | /* |
| 175 | * Special vmas that are non-mergable, non-mlock()able. |
| 176 | * Note: mm/huge_memory.c VM_NO_THP depends on this definition. |
| 177 | */ |
| 178 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
| 179 | |
| 180 | /* |
| 181 | * mapping from the currently active vm_flags protection bits (the |
| 182 | * low four bits) to a page protection mask.. |
| 183 | */ |
| 184 | extern pgprot_t protection_map[16]; |
| 185 | |
| 186 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
| 187 | #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ |
| 188 | #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */ |
| 189 | #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */ |
| 190 | #define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */ |
| 191 | #define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */ |
| 192 | #define FAULT_FLAG_TRIED 0x40 /* second try */ |
| 193 | #define FAULT_FLAG_USER 0x80 /* The fault originated in userspace */ |
| 194 | |
| 195 | /* |
| 196 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
| 197 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
| 198 | * of VM_FAULT_xxx flags that give details about how the fault was handled. |
| 199 | * |
| 200 | * pgoff should be used in favour of virtual_address, if possible. If pgoff |
| 201 | * is used, one may implement ->remap_pages to get nonlinear mapping support. |
| 202 | */ |
| 203 | struct vm_fault { |
| 204 | unsigned int flags; /* FAULT_FLAG_xxx flags */ |
| 205 | pgoff_t pgoff; /* Logical page offset based on vma */ |
| 206 | void __user *virtual_address; /* Faulting virtual address */ |
| 207 | |
| 208 | struct page *page; /* ->fault handlers should return a |
| 209 | * page here, unless VM_FAULT_NOPAGE |
| 210 | * is set (which is also implied by |
| 211 | * VM_FAULT_ERROR). |
| 212 | */ |
| 213 | }; |
| 214 | |
| 215 | /* |
| 216 | * These are the virtual MM functions - opening of an area, closing and |
| 217 | * unmapping it (needed to keep files on disk up-to-date etc), pointer |
| 218 | * to the functions called when a no-page or a wp-page exception occurs. |
| 219 | */ |
| 220 | struct vm_operations_struct { |
| 221 | void (*open)(struct vm_area_struct * area); |
| 222 | void (*close)(struct vm_area_struct * area); |
| 223 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
| 224 | |
| 225 | /* notification that a previously read-only page is about to become |
| 226 | * writable, if an error is returned it will cause a SIGBUS */ |
| 227 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
| 228 | |
| 229 | /* called by access_process_vm when get_user_pages() fails, typically |
| 230 | * for use by special VMAs that can switch between memory and hardware |
| 231 | */ |
| 232 | int (*access)(struct vm_area_struct *vma, unsigned long addr, |
| 233 | void *buf, int len, int write); |
| 234 | #ifdef CONFIG_NUMA |
| 235 | /* |
| 236 | * set_policy() op must add a reference to any non-NULL @new mempolicy |
| 237 | * to hold the policy upon return. Caller should pass NULL @new to |
| 238 | * remove a policy and fall back to surrounding context--i.e. do not |
| 239 | * install a MPOL_DEFAULT policy, nor the task or system default |
| 240 | * mempolicy. |
| 241 | */ |
| 242 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
| 243 | |
| 244 | /* |
| 245 | * get_policy() op must add reference [mpol_get()] to any policy at |
| 246 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure |
| 247 | * in mm/mempolicy.c will do this automatically. |
| 248 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not |
| 249 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. |
| 250 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
| 251 | * must return NULL--i.e., do not "fallback" to task or system default |
| 252 | * policy. |
| 253 | */ |
| 254 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
| 255 | unsigned long addr); |
| 256 | int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, |
| 257 | const nodemask_t *to, unsigned long flags); |
| 258 | #endif |
| 259 | /* called by sys_remap_file_pages() to populate non-linear mapping */ |
| 260 | int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr, |
| 261 | unsigned long size, pgoff_t pgoff); |
| 262 | }; |
| 263 | |
| 264 | struct mmu_gather; |
| 265 | struct inode; |
| 266 | |
| 267 | #define page_private(page) ((page)->private) |
| 268 | #define set_page_private(page, v) ((page)->private = (v)) |
| 269 | |
| 270 | /* It's valid only if the page is free path or free_list */ |
| 271 | static inline void set_freepage_migratetype(struct page *page, int migratetype) |
| 272 | { |
| 273 | page->index = migratetype; |
| 274 | } |
| 275 | |
| 276 | /* It's valid only if the page is free path or free_list */ |
| 277 | static inline int get_freepage_migratetype(struct page *page) |
| 278 | { |
| 279 | return page->index; |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * FIXME: take this include out, include page-flags.h in |
| 284 | * files which need it (119 of them) |
| 285 | */ |
| 286 | #include <linux/page-flags.h> |
| 287 | #include <linux/huge_mm.h> |
| 288 | |
| 289 | /* |
| 290 | * Methods to modify the page usage count. |
| 291 | * |
| 292 | * What counts for a page usage: |
| 293 | * - cache mapping (page->mapping) |
| 294 | * - private data (page->private) |
| 295 | * - page mapped in a task's page tables, each mapping |
| 296 | * is counted separately |
| 297 | * |
| 298 | * Also, many kernel routines increase the page count before a critical |
| 299 | * routine so they can be sure the page doesn't go away from under them. |
| 300 | */ |
| 301 | |
| 302 | /* |
| 303 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
| 304 | */ |
| 305 | static inline int put_page_testzero(struct page *page) |
| 306 | { |
| 307 | VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page); |
| 308 | return atomic_dec_and_test(&page->_count); |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * Try to grab a ref unless the page has a refcount of zero, return false if |
| 313 | * that is the case. |
| 314 | * This can be called when MMU is off so it must not access |
| 315 | * any of the virtual mappings. |
| 316 | */ |
| 317 | static inline int get_page_unless_zero(struct page *page) |
| 318 | { |
| 319 | return atomic_inc_not_zero(&page->_count); |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * Try to drop a ref unless the page has a refcount of one, return false if |
| 324 | * that is the case. |
| 325 | * This is to make sure that the refcount won't become zero after this drop. |
| 326 | * This can be called when MMU is off so it must not access |
| 327 | * any of the virtual mappings. |
| 328 | */ |
| 329 | static inline int put_page_unless_one(struct page *page) |
| 330 | { |
| 331 | return atomic_add_unless(&page->_count, -1, 1); |
| 332 | } |
| 333 | |
| 334 | extern int page_is_ram(unsigned long pfn); |
| 335 | |
| 336 | /* Support for virtually mapped pages */ |
| 337 | struct page *vmalloc_to_page(const void *addr); |
| 338 | unsigned long vmalloc_to_pfn(const void *addr); |
| 339 | |
| 340 | /* |
| 341 | * Determine if an address is within the vmalloc range |
| 342 | * |
| 343 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there |
| 344 | * is no special casing required. |
| 345 | */ |
| 346 | static inline int is_vmalloc_addr(const void *x) |
| 347 | { |
| 348 | #ifdef CONFIG_MMU |
| 349 | unsigned long addr = (unsigned long)x; |
| 350 | |
| 351 | return addr >= VMALLOC_START && addr < VMALLOC_END; |
| 352 | #else |
| 353 | return 0; |
| 354 | #endif |
| 355 | } |
| 356 | #ifdef CONFIG_MMU |
| 357 | extern int is_vmalloc_or_module_addr(const void *x); |
| 358 | #else |
| 359 | static inline int is_vmalloc_or_module_addr(const void *x) |
| 360 | { |
| 361 | return 0; |
| 362 | } |
| 363 | #endif |
| 364 | |
| 365 | static inline void compound_lock(struct page *page) |
| 366 | { |
| 367 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 368 | VM_BUG_ON_PAGE(PageSlab(page), page); |
| 369 | bit_spin_lock(PG_compound_lock, &page->flags); |
| 370 | #endif |
| 371 | } |
| 372 | |
| 373 | static inline void compound_unlock(struct page *page) |
| 374 | { |
| 375 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 376 | VM_BUG_ON_PAGE(PageSlab(page), page); |
| 377 | bit_spin_unlock(PG_compound_lock, &page->flags); |
| 378 | #endif |
| 379 | } |
| 380 | |
| 381 | static inline unsigned long compound_lock_irqsave(struct page *page) |
| 382 | { |
| 383 | unsigned long uninitialized_var(flags); |
| 384 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 385 | local_irq_save(flags); |
| 386 | compound_lock(page); |
| 387 | #endif |
| 388 | return flags; |
| 389 | } |
| 390 | |
| 391 | static inline void compound_unlock_irqrestore(struct page *page, |
| 392 | unsigned long flags) |
| 393 | { |
| 394 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 395 | compound_unlock(page); |
| 396 | local_irq_restore(flags); |
| 397 | #endif |
| 398 | } |
| 399 | |
| 400 | static inline struct page *compound_head(struct page *page) |
| 401 | { |
| 402 | if (unlikely(PageTail(page))) { |
| 403 | struct page *head = page->first_page; |
| 404 | |
| 405 | /* |
| 406 | * page->first_page may be a dangling pointer to an old |
| 407 | * compound page, so recheck that it is still a tail |
| 408 | * page before returning. |
| 409 | */ |
| 410 | smp_rmb(); |
| 411 | if (likely(PageTail(page))) |
| 412 | return head; |
| 413 | } |
| 414 | return page; |
| 415 | } |
| 416 | |
| 417 | /* |
| 418 | * The atomic page->_mapcount, starts from -1: so that transitions |
| 419 | * both from it and to it can be tracked, using atomic_inc_and_test |
| 420 | * and atomic_add_negative(-1). |
| 421 | */ |
| 422 | static inline void page_mapcount_reset(struct page *page) |
| 423 | { |
| 424 | atomic_set(&(page)->_mapcount, -1); |
| 425 | } |
| 426 | |
| 427 | static inline int page_mapcount(struct page *page) |
| 428 | { |
| 429 | return atomic_read(&(page)->_mapcount) + 1; |
| 430 | } |
| 431 | |
| 432 | static inline int page_count(struct page *page) |
| 433 | { |
| 434 | return atomic_read(&compound_head(page)->_count); |
| 435 | } |
| 436 | |
| 437 | #ifdef CONFIG_HUGETLB_PAGE |
| 438 | extern int PageHeadHuge(struct page *page_head); |
| 439 | #else /* CONFIG_HUGETLB_PAGE */ |
| 440 | static inline int PageHeadHuge(struct page *page_head) |
| 441 | { |
| 442 | return 0; |
| 443 | } |
| 444 | #endif /* CONFIG_HUGETLB_PAGE */ |
| 445 | |
| 446 | static inline bool __compound_tail_refcounted(struct page *page) |
| 447 | { |
| 448 | return !PageSlab(page) && !PageHeadHuge(page); |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * This takes a head page as parameter and tells if the |
| 453 | * tail page reference counting can be skipped. |
| 454 | * |
| 455 | * For this to be safe, PageSlab and PageHeadHuge must remain true on |
| 456 | * any given page where they return true here, until all tail pins |
| 457 | * have been released. |
| 458 | */ |
| 459 | static inline bool compound_tail_refcounted(struct page *page) |
| 460 | { |
| 461 | VM_BUG_ON_PAGE(!PageHead(page), page); |
| 462 | return __compound_tail_refcounted(page); |
| 463 | } |
| 464 | |
| 465 | static inline void get_huge_page_tail(struct page *page) |
| 466 | { |
| 467 | /* |
| 468 | * __split_huge_page_refcount() cannot run from under us. |
| 469 | */ |
| 470 | VM_BUG_ON_PAGE(!PageTail(page), page); |
| 471 | VM_BUG_ON_PAGE(page_mapcount(page) < 0, page); |
| 472 | VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page); |
| 473 | if (compound_tail_refcounted(page->first_page)) |
| 474 | atomic_inc(&page->_mapcount); |
| 475 | } |
| 476 | |
| 477 | extern bool __get_page_tail(struct page *page); |
| 478 | |
| 479 | static inline void get_page(struct page *page) |
| 480 | { |
| 481 | if (unlikely(PageTail(page))) |
| 482 | if (likely(__get_page_tail(page))) |
| 483 | return; |
| 484 | /* |
| 485 | * Getting a normal page or the head of a compound page |
| 486 | * requires to already have an elevated page->_count. |
| 487 | */ |
| 488 | VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page); |
| 489 | atomic_inc(&page->_count); |
| 490 | } |
| 491 | |
| 492 | static inline struct page *virt_to_head_page(const void *x) |
| 493 | { |
| 494 | struct page *page = virt_to_page(x); |
| 495 | return compound_head(page); |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Setup the page count before being freed into the page allocator for |
| 500 | * the first time (boot or memory hotplug) |
| 501 | */ |
| 502 | static inline void init_page_count(struct page *page) |
| 503 | { |
| 504 | atomic_set(&page->_count, 1); |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * PageBuddy() indicate that the page is free and in the buddy system |
| 509 | * (see mm/page_alloc.c). |
| 510 | * |
| 511 | * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to |
| 512 | * -2 so that an underflow of the page_mapcount() won't be mistaken |
| 513 | * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very |
| 514 | * efficiently by most CPU architectures. |
| 515 | */ |
| 516 | #define PAGE_BUDDY_MAPCOUNT_VALUE (-128) |
| 517 | |
| 518 | static inline int PageBuddy(struct page *page) |
| 519 | { |
| 520 | return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE; |
| 521 | } |
| 522 | |
| 523 | static inline void __SetPageBuddy(struct page *page) |
| 524 | { |
| 525 | VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page); |
| 526 | atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE); |
| 527 | } |
| 528 | |
| 529 | static inline void __ClearPageBuddy(struct page *page) |
| 530 | { |
| 531 | VM_BUG_ON_PAGE(!PageBuddy(page), page); |
| 532 | atomic_set(&page->_mapcount, -1); |
| 533 | } |
| 534 | |
| 535 | void put_page(struct page *page); |
| 536 | void put_pages_list(struct list_head *pages); |
| 537 | |
| 538 | void split_page(struct page *page, unsigned int order); |
| 539 | int split_free_page(struct page *page); |
| 540 | |
| 541 | /* |
| 542 | * Compound pages have a destructor function. Provide a |
| 543 | * prototype for that function and accessor functions. |
| 544 | * These are _only_ valid on the head of a PG_compound page. |
| 545 | */ |
| 546 | typedef void compound_page_dtor(struct page *); |
| 547 | |
| 548 | static inline void set_compound_page_dtor(struct page *page, |
| 549 | compound_page_dtor *dtor) |
| 550 | { |
| 551 | page[1].lru.next = (void *)dtor; |
| 552 | } |
| 553 | |
| 554 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) |
| 555 | { |
| 556 | return (compound_page_dtor *)page[1].lru.next; |
| 557 | } |
| 558 | |
| 559 | static inline int compound_order(struct page *page) |
| 560 | { |
| 561 | if (!PageHead(page)) |
| 562 | return 0; |
| 563 | return (unsigned long)page[1].lru.prev; |
| 564 | } |
| 565 | |
| 566 | static inline void set_compound_order(struct page *page, unsigned long order) |
| 567 | { |
| 568 | page[1].lru.prev = (void *)order; |
| 569 | } |
| 570 | |
| 571 | #ifdef CONFIG_MMU |
| 572 | /* |
| 573 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when |
| 574 | * servicing faults for write access. In the normal case, do always want |
| 575 | * pte_mkwrite. But get_user_pages can cause write faults for mappings |
| 576 | * that do not have writing enabled, when used by access_process_vm. |
| 577 | */ |
| 578 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) |
| 579 | { |
| 580 | if (likely(vma->vm_flags & VM_WRITE)) |
| 581 | pte = pte_mkwrite(pte); |
| 582 | return pte; |
| 583 | } |
| 584 | #endif |
| 585 | |
| 586 | /* |
| 587 | * Multiple processes may "see" the same page. E.g. for untouched |
| 588 | * mappings of /dev/null, all processes see the same page full of |
| 589 | * zeroes, and text pages of executables and shared libraries have |
| 590 | * only one copy in memory, at most, normally. |
| 591 | * |
| 592 | * For the non-reserved pages, page_count(page) denotes a reference count. |
| 593 | * page_count() == 0 means the page is free. page->lru is then used for |
| 594 | * freelist management in the buddy allocator. |
| 595 | * page_count() > 0 means the page has been allocated. |
| 596 | * |
| 597 | * Pages are allocated by the slab allocator in order to provide memory |
| 598 | * to kmalloc and kmem_cache_alloc. In this case, the management of the |
| 599 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c |
| 600 | * unless a particular usage is carefully commented. (the responsibility of |
| 601 | * freeing the kmalloc memory is the caller's, of course). |
| 602 | * |
| 603 | * A page may be used by anyone else who does a __get_free_page(). |
| 604 | * In this case, page_count still tracks the references, and should only |
| 605 | * be used through the normal accessor functions. The top bits of page->flags |
| 606 | * and page->virtual store page management information, but all other fields |
| 607 | * are unused and could be used privately, carefully. The management of this |
| 608 | * page is the responsibility of the one who allocated it, and those who have |
| 609 | * subsequently been given references to it. |
| 610 | * |
| 611 | * The other pages (we may call them "pagecache pages") are completely |
| 612 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
| 613 | * The following discussion applies only to them. |
| 614 | * |
| 615 | * A pagecache page contains an opaque `private' member, which belongs to the |
| 616 | * page's address_space. Usually, this is the address of a circular list of |
| 617 | * the page's disk buffers. PG_private must be set to tell the VM to call |
| 618 | * into the filesystem to release these pages. |
| 619 | * |
| 620 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
| 621 | * is the pointer to the inode, and page->index is the file offset of the page, |
| 622 | * in units of PAGE_CACHE_SIZE. |
| 623 | * |
| 624 | * If pagecache pages are not associated with an inode, they are said to be |
| 625 | * anonymous pages. These may become associated with the swapcache, and in that |
| 626 | * case PG_swapcache is set, and page->private is an offset into the swapcache. |
| 627 | * |
| 628 | * In either case (swapcache or inode backed), the pagecache itself holds one |
| 629 | * reference to the page. Setting PG_private should also increment the |
| 630 | * refcount. The each user mapping also has a reference to the page. |
| 631 | * |
| 632 | * The pagecache pages are stored in a per-mapping radix tree, which is |
| 633 | * rooted at mapping->page_tree, and indexed by offset. |
| 634 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space |
| 635 | * lists, we instead now tag pages as dirty/writeback in the radix tree. |
| 636 | * |
| 637 | * All pagecache pages may be subject to I/O: |
| 638 | * - inode pages may need to be read from disk, |
| 639 | * - inode pages which have been modified and are MAP_SHARED may need |
| 640 | * to be written back to the inode on disk, |
| 641 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been |
| 642 | * modified may need to be swapped out to swap space and (later) to be read |
| 643 | * back into memory. |
| 644 | */ |
| 645 | |
| 646 | /* |
| 647 | * The zone field is never updated after free_area_init_core() |
| 648 | * sets it, so none of the operations on it need to be atomic. |
| 649 | */ |
| 650 | |
| 651 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
| 652 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
| 653 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
| 654 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) |
| 655 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
| 656 | |
| 657 | /* |
| 658 | * Define the bit shifts to access each section. For non-existent |
| 659 | * sections we define the shift as 0; that plus a 0 mask ensures |
| 660 | * the compiler will optimise away reference to them. |
| 661 | */ |
| 662 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
| 663 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) |
| 664 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) |
| 665 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
| 666 | |
| 667 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
| 668 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
| 669 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
| 670 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
| 671 | SECTIONS_PGOFF : ZONES_PGOFF) |
| 672 | #else |
| 673 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
| 674 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
| 675 | NODES_PGOFF : ZONES_PGOFF) |
| 676 | #endif |
| 677 | |
| 678 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
| 679 | |
| 680 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
| 681 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
| 682 | #endif |
| 683 | |
| 684 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
| 685 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) |
| 686 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) |
| 687 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_WIDTH) - 1) |
| 688 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
| 689 | |
| 690 | static inline enum zone_type page_zonenum(const struct page *page) |
| 691 | { |
| 692 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
| 693 | } |
| 694 | |
| 695 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
| 696 | #define SECTION_IN_PAGE_FLAGS |
| 697 | #endif |
| 698 | |
| 699 | /* |
| 700 | * The identification function is mainly used by the buddy allocator for |
| 701 | * determining if two pages could be buddies. We are not really identifying |
| 702 | * the zone since we could be using the section number id if we do not have |
| 703 | * node id available in page flags. |
| 704 | * We only guarantee that it will return the same value for two combinable |
| 705 | * pages in a zone. |
| 706 | */ |
| 707 | static inline int page_zone_id(struct page *page) |
| 708 | { |
| 709 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
| 710 | } |
| 711 | |
| 712 | static inline int zone_to_nid(struct zone *zone) |
| 713 | { |
| 714 | #ifdef CONFIG_NUMA |
| 715 | return zone->node; |
| 716 | #else |
| 717 | return 0; |
| 718 | #endif |
| 719 | } |
| 720 | |
| 721 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
| 722 | extern int page_to_nid(const struct page *page); |
| 723 | #else |
| 724 | static inline int page_to_nid(const struct page *page) |
| 725 | { |
| 726 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
| 727 | } |
| 728 | #endif |
| 729 | |
| 730 | #ifdef CONFIG_NUMA_BALANCING |
| 731 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
| 732 | { |
| 733 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
| 734 | } |
| 735 | |
| 736 | static inline int cpupid_to_pid(int cpupid) |
| 737 | { |
| 738 | return cpupid & LAST__PID_MASK; |
| 739 | } |
| 740 | |
| 741 | static inline int cpupid_to_cpu(int cpupid) |
| 742 | { |
| 743 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
| 744 | } |
| 745 | |
| 746 | static inline int cpupid_to_nid(int cpupid) |
| 747 | { |
| 748 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
| 749 | } |
| 750 | |
| 751 | static inline bool cpupid_pid_unset(int cpupid) |
| 752 | { |
| 753 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
| 754 | } |
| 755 | |
| 756 | static inline bool cpupid_cpu_unset(int cpupid) |
| 757 | { |
| 758 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
| 759 | } |
| 760 | |
| 761 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
| 762 | { |
| 763 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); |
| 764 | } |
| 765 | |
| 766 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) |
| 767 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
| 768 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) |
| 769 | { |
| 770 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
| 771 | } |
| 772 | |
| 773 | static inline int page_cpupid_last(struct page *page) |
| 774 | { |
| 775 | return page->_last_cpupid; |
| 776 | } |
| 777 | static inline void page_cpupid_reset_last(struct page *page) |
| 778 | { |
| 779 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
| 780 | } |
| 781 | #else |
| 782 | static inline int page_cpupid_last(struct page *page) |
| 783 | { |
| 784 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
| 785 | } |
| 786 | |
| 787 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
| 788 | |
| 789 | static inline void page_cpupid_reset_last(struct page *page) |
| 790 | { |
| 791 | int cpupid = (1 << LAST_CPUPID_SHIFT) - 1; |
| 792 | |
| 793 | page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT); |
| 794 | page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT; |
| 795 | } |
| 796 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
| 797 | #else /* !CONFIG_NUMA_BALANCING */ |
| 798 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) |
| 799 | { |
| 800 | return page_to_nid(page); /* XXX */ |
| 801 | } |
| 802 | |
| 803 | static inline int page_cpupid_last(struct page *page) |
| 804 | { |
| 805 | return page_to_nid(page); /* XXX */ |
| 806 | } |
| 807 | |
| 808 | static inline int cpupid_to_nid(int cpupid) |
| 809 | { |
| 810 | return -1; |
| 811 | } |
| 812 | |
| 813 | static inline int cpupid_to_pid(int cpupid) |
| 814 | { |
| 815 | return -1; |
| 816 | } |
| 817 | |
| 818 | static inline int cpupid_to_cpu(int cpupid) |
| 819 | { |
| 820 | return -1; |
| 821 | } |
| 822 | |
| 823 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
| 824 | { |
| 825 | return -1; |
| 826 | } |
| 827 | |
| 828 | static inline bool cpupid_pid_unset(int cpupid) |
| 829 | { |
| 830 | return 1; |
| 831 | } |
| 832 | |
| 833 | static inline void page_cpupid_reset_last(struct page *page) |
| 834 | { |
| 835 | } |
| 836 | |
| 837 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) |
| 838 | { |
| 839 | return false; |
| 840 | } |
| 841 | #endif /* CONFIG_NUMA_BALANCING */ |
| 842 | |
| 843 | static inline struct zone *page_zone(const struct page *page) |
| 844 | { |
| 845 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; |
| 846 | } |
| 847 | |
| 848 | #ifdef SECTION_IN_PAGE_FLAGS |
| 849 | static inline void set_page_section(struct page *page, unsigned long section) |
| 850 | { |
| 851 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); |
| 852 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; |
| 853 | } |
| 854 | |
| 855 | static inline unsigned long page_to_section(const struct page *page) |
| 856 | { |
| 857 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; |
| 858 | } |
| 859 | #endif |
| 860 | |
| 861 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
| 862 | { |
| 863 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); |
| 864 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; |
| 865 | } |
| 866 | |
| 867 | static inline void set_page_node(struct page *page, unsigned long node) |
| 868 | { |
| 869 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); |
| 870 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; |
| 871 | } |
| 872 | |
| 873 | static inline void set_page_links(struct page *page, enum zone_type zone, |
| 874 | unsigned long node, unsigned long pfn) |
| 875 | { |
| 876 | set_page_zone(page, zone); |
| 877 | set_page_node(page, node); |
| 878 | #ifdef SECTION_IN_PAGE_FLAGS |
| 879 | set_page_section(page, pfn_to_section_nr(pfn)); |
| 880 | #endif |
| 881 | } |
| 882 | |
| 883 | /* |
| 884 | * Some inline functions in vmstat.h depend on page_zone() |
| 885 | */ |
| 886 | #include <linux/vmstat.h> |
| 887 | |
| 888 | static __always_inline void *lowmem_page_address(const struct page *page) |
| 889 | { |
| 890 | return __va(PFN_PHYS(page_to_pfn(page))); |
| 891 | } |
| 892 | |
| 893 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) |
| 894 | #define HASHED_PAGE_VIRTUAL |
| 895 | #endif |
| 896 | |
| 897 | #if defined(WANT_PAGE_VIRTUAL) |
| 898 | static inline void *page_address(const struct page *page) |
| 899 | { |
| 900 | return page->virtual; |
| 901 | } |
| 902 | static inline void set_page_address(struct page *page, void *address) |
| 903 | { |
| 904 | page->virtual = address; |
| 905 | } |
| 906 | #define page_address_init() do { } while(0) |
| 907 | #endif |
| 908 | |
| 909 | #if defined(HASHED_PAGE_VIRTUAL) |
| 910 | void *page_address(const struct page *page); |
| 911 | void set_page_address(struct page *page, void *virtual); |
| 912 | void page_address_init(void); |
| 913 | #endif |
| 914 | |
| 915 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) |
| 916 | #define page_address(page) lowmem_page_address(page) |
| 917 | #define set_page_address(page, address) do { } while(0) |
| 918 | #define page_address_init() do { } while(0) |
| 919 | #endif |
| 920 | |
| 921 | /* |
| 922 | * On an anonymous page mapped into a user virtual memory area, |
| 923 | * page->mapping points to its anon_vma, not to a struct address_space; |
| 924 | * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. |
| 925 | * |
| 926 | * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled, |
| 927 | * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit; |
| 928 | * and then page->mapping points, not to an anon_vma, but to a private |
| 929 | * structure which KSM associates with that merged page. See ksm.h. |
| 930 | * |
| 931 | * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used. |
| 932 | * |
| 933 | * Please note that, confusingly, "page_mapping" refers to the inode |
| 934 | * address_space which maps the page from disk; whereas "page_mapped" |
| 935 | * refers to user virtual address space into which the page is mapped. |
| 936 | */ |
| 937 | #define PAGE_MAPPING_ANON 1 |
| 938 | #define PAGE_MAPPING_KSM 2 |
| 939 | #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM) |
| 940 | |
| 941 | extern struct address_space *page_mapping(struct page *page); |
| 942 | |
| 943 | /* Neutral page->mapping pointer to address_space or anon_vma or other */ |
| 944 | static inline void *page_rmapping(struct page *page) |
| 945 | { |
| 946 | return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS); |
| 947 | } |
| 948 | |
| 949 | extern struct address_space *__page_file_mapping(struct page *); |
| 950 | |
| 951 | static inline |
| 952 | struct address_space *page_file_mapping(struct page *page) |
| 953 | { |
| 954 | if (unlikely(PageSwapCache(page))) |
| 955 | return __page_file_mapping(page); |
| 956 | |
| 957 | return page->mapping; |
| 958 | } |
| 959 | |
| 960 | static inline int PageAnon(struct page *page) |
| 961 | { |
| 962 | return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; |
| 963 | } |
| 964 | |
| 965 | /* |
| 966 | * Return the pagecache index of the passed page. Regular pagecache pages |
| 967 | * use ->index whereas swapcache pages use ->private |
| 968 | */ |
| 969 | static inline pgoff_t page_index(struct page *page) |
| 970 | { |
| 971 | if (unlikely(PageSwapCache(page))) |
| 972 | return page_private(page); |
| 973 | return page->index; |
| 974 | } |
| 975 | |
| 976 | extern pgoff_t __page_file_index(struct page *page); |
| 977 | |
| 978 | /* |
| 979 | * Return the file index of the page. Regular pagecache pages use ->index |
| 980 | * whereas swapcache pages use swp_offset(->private) |
| 981 | */ |
| 982 | static inline pgoff_t page_file_index(struct page *page) |
| 983 | { |
| 984 | if (unlikely(PageSwapCache(page))) |
| 985 | return __page_file_index(page); |
| 986 | |
| 987 | return page->index; |
| 988 | } |
| 989 | |
| 990 | /* |
| 991 | * Return true if this page is mapped into pagetables. |
| 992 | */ |
| 993 | static inline int page_mapped(struct page *page) |
| 994 | { |
| 995 | return atomic_read(&(page)->_mapcount) >= 0; |
| 996 | } |
| 997 | |
| 998 | /* |
| 999 | * Different kinds of faults, as returned by handle_mm_fault(). |
| 1000 | * Used to decide whether a process gets delivered SIGBUS or |
| 1001 | * just gets major/minor fault counters bumped up. |
| 1002 | */ |
| 1003 | |
| 1004 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ |
| 1005 | |
| 1006 | #define VM_FAULT_OOM 0x0001 |
| 1007 | #define VM_FAULT_SIGBUS 0x0002 |
| 1008 | #define VM_FAULT_MAJOR 0x0004 |
| 1009 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ |
| 1010 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ |
| 1011 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ |
| 1012 | |
| 1013 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
| 1014 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ |
| 1015 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ |
| 1016 | #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */ |
| 1017 | |
| 1018 | #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ |
| 1019 | |
| 1020 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \ |
| 1021 | VM_FAULT_FALLBACK | VM_FAULT_HWPOISON_LARGE) |
| 1022 | |
| 1023 | /* Encode hstate index for a hwpoisoned large page */ |
| 1024 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12) |
| 1025 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) |
| 1026 | |
| 1027 | /* |
| 1028 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. |
| 1029 | */ |
| 1030 | extern void pagefault_out_of_memory(void); |
| 1031 | |
| 1032 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
| 1033 | |
| 1034 | /* |
| 1035 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
| 1036 | * various contexts. |
| 1037 | */ |
| 1038 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
| 1039 | |
| 1040 | extern void show_free_areas(unsigned int flags); |
| 1041 | extern bool skip_free_areas_node(unsigned int flags, int nid); |
| 1042 | |
| 1043 | int shmem_zero_setup(struct vm_area_struct *); |
| 1044 | #ifdef CONFIG_SHMEM |
| 1045 | bool shmem_mapping(struct address_space *mapping); |
| 1046 | #else |
| 1047 | static inline bool shmem_mapping(struct address_space *mapping) |
| 1048 | { |
| 1049 | return false; |
| 1050 | } |
| 1051 | #endif |
| 1052 | |
| 1053 | extern int can_do_mlock(void); |
| 1054 | extern int user_shm_lock(size_t, struct user_struct *); |
| 1055 | extern void user_shm_unlock(size_t, struct user_struct *); |
| 1056 | |
| 1057 | /* |
| 1058 | * Parameter block passed down to zap_pte_range in exceptional cases. |
| 1059 | */ |
| 1060 | struct zap_details { |
| 1061 | struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ |
| 1062 | struct address_space *check_mapping; /* Check page->mapping if set */ |
| 1063 | pgoff_t first_index; /* Lowest page->index to unmap */ |
| 1064 | pgoff_t last_index; /* Highest page->index to unmap */ |
| 1065 | }; |
| 1066 | |
| 1067 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
| 1068 | pte_t pte); |
| 1069 | |
| 1070 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
| 1071 | unsigned long size); |
| 1072 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
| 1073 | unsigned long size, struct zap_details *); |
| 1074 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
| 1075 | unsigned long start, unsigned long end); |
| 1076 | |
| 1077 | /** |
| 1078 | * mm_walk - callbacks for walk_page_range |
| 1079 | * @pgd_entry: if set, called for each non-empty PGD (top-level) entry |
| 1080 | * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry |
| 1081 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry |
| 1082 | * this handler is required to be able to handle |
| 1083 | * pmd_trans_huge() pmds. They may simply choose to |
| 1084 | * split_huge_page() instead of handling it explicitly. |
| 1085 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
| 1086 | * @pte_hole: if set, called for each hole at all levels |
| 1087 | * @hugetlb_entry: if set, called for each hugetlb entry |
| 1088 | * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry |
| 1089 | * is used. |
| 1090 | * |
| 1091 | * (see walk_page_range for more details) |
| 1092 | */ |
| 1093 | struct mm_walk { |
| 1094 | int (*pgd_entry)(pgd_t *pgd, unsigned long addr, |
| 1095 | unsigned long next, struct mm_walk *walk); |
| 1096 | int (*pud_entry)(pud_t *pud, unsigned long addr, |
| 1097 | unsigned long next, struct mm_walk *walk); |
| 1098 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr, |
| 1099 | unsigned long next, struct mm_walk *walk); |
| 1100 | int (*pte_entry)(pte_t *pte, unsigned long addr, |
| 1101 | unsigned long next, struct mm_walk *walk); |
| 1102 | int (*pte_hole)(unsigned long addr, unsigned long next, |
| 1103 | struct mm_walk *walk); |
| 1104 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, |
| 1105 | unsigned long addr, unsigned long next, |
| 1106 | struct mm_walk *walk); |
| 1107 | struct mm_struct *mm; |
| 1108 | void *private; |
| 1109 | }; |
| 1110 | |
| 1111 | int walk_page_range(unsigned long addr, unsigned long end, |
| 1112 | struct mm_walk *walk); |
| 1113 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
| 1114 | unsigned long end, unsigned long floor, unsigned long ceiling); |
| 1115 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
| 1116 | struct vm_area_struct *vma); |
| 1117 | void unmap_mapping_range(struct address_space *mapping, |
| 1118 | loff_t const holebegin, loff_t const holelen, int even_cows); |
| 1119 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
| 1120 | unsigned long *pfn); |
| 1121 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
| 1122 | unsigned int flags, unsigned long *prot, resource_size_t *phys); |
| 1123 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
| 1124 | void *buf, int len, int write); |
| 1125 | |
| 1126 | static inline void unmap_shared_mapping_range(struct address_space *mapping, |
| 1127 | loff_t const holebegin, loff_t const holelen) |
| 1128 | { |
| 1129 | unmap_mapping_range(mapping, holebegin, holelen, 0); |
| 1130 | } |
| 1131 | |
| 1132 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
| 1133 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
| 1134 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
| 1135 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
| 1136 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
| 1137 | int invalidate_inode_page(struct page *page); |
| 1138 | |
| 1139 | #ifdef CONFIG_MMU |
| 1140 | extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
| 1141 | unsigned long address, unsigned int flags); |
| 1142 | extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, |
| 1143 | unsigned long address, unsigned int fault_flags); |
| 1144 | #else |
| 1145 | static inline int handle_mm_fault(struct mm_struct *mm, |
| 1146 | struct vm_area_struct *vma, unsigned long address, |
| 1147 | unsigned int flags) |
| 1148 | { |
| 1149 | /* should never happen if there's no MMU */ |
| 1150 | BUG(); |
| 1151 | return VM_FAULT_SIGBUS; |
| 1152 | } |
| 1153 | static inline int fixup_user_fault(struct task_struct *tsk, |
| 1154 | struct mm_struct *mm, unsigned long address, |
| 1155 | unsigned int fault_flags) |
| 1156 | { |
| 1157 | /* should never happen if there's no MMU */ |
| 1158 | BUG(); |
| 1159 | return -EFAULT; |
| 1160 | } |
| 1161 | #endif |
| 1162 | |
| 1163 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); |
| 1164 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
| 1165 | void *buf, int len, int write); |
| 1166 | |
| 1167 | long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
| 1168 | unsigned long start, unsigned long nr_pages, |
| 1169 | unsigned int foll_flags, struct page **pages, |
| 1170 | struct vm_area_struct **vmas, int *nonblocking); |
| 1171 | long get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
| 1172 | unsigned long start, unsigned long nr_pages, |
| 1173 | int write, int force, struct page **pages, |
| 1174 | struct vm_area_struct **vmas); |
| 1175 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
| 1176 | struct page **pages); |
| 1177 | struct kvec; |
| 1178 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, |
| 1179 | struct page **pages); |
| 1180 | int get_kernel_page(unsigned long start, int write, struct page **pages); |
| 1181 | struct page *get_dump_page(unsigned long addr); |
| 1182 | |
| 1183 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
| 1184 | extern void do_invalidatepage(struct page *page, unsigned int offset, |
| 1185 | unsigned int length); |
| 1186 | |
| 1187 | int __set_page_dirty_nobuffers(struct page *page); |
| 1188 | int __set_page_dirty_no_writeback(struct page *page); |
| 1189 | int redirty_page_for_writepage(struct writeback_control *wbc, |
| 1190 | struct page *page); |
| 1191 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
| 1192 | void account_page_writeback(struct page *page); |
| 1193 | int set_page_dirty(struct page *page); |
| 1194 | int set_page_dirty_lock(struct page *page); |
| 1195 | int clear_page_dirty_for_io(struct page *page); |
| 1196 | |
| 1197 | /* Is the vma a continuation of the stack vma above it? */ |
| 1198 | static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr) |
| 1199 | { |
| 1200 | return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); |
| 1201 | } |
| 1202 | |
| 1203 | static inline int stack_guard_page_start(struct vm_area_struct *vma, |
| 1204 | unsigned long addr) |
| 1205 | { |
| 1206 | return (vma->vm_flags & VM_GROWSDOWN) && |
| 1207 | (vma->vm_start == addr) && |
| 1208 | !vma_growsdown(vma->vm_prev, addr); |
| 1209 | } |
| 1210 | |
| 1211 | /* Is the vma a continuation of the stack vma below it? */ |
| 1212 | static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr) |
| 1213 | { |
| 1214 | return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP); |
| 1215 | } |
| 1216 | |
| 1217 | static inline int stack_guard_page_end(struct vm_area_struct *vma, |
| 1218 | unsigned long addr) |
| 1219 | { |
| 1220 | return (vma->vm_flags & VM_GROWSUP) && |
| 1221 | (vma->vm_end == addr) && |
| 1222 | !vma_growsup(vma->vm_next, addr); |
| 1223 | } |
| 1224 | |
| 1225 | extern pid_t |
| 1226 | vm_is_stack(struct task_struct *task, struct vm_area_struct *vma, int in_group); |
| 1227 | |
| 1228 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
| 1229 | unsigned long old_addr, struct vm_area_struct *new_vma, |
| 1230 | unsigned long new_addr, unsigned long len, |
| 1231 | bool need_rmap_locks); |
| 1232 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
| 1233 | unsigned long end, pgprot_t newprot, |
| 1234 | int dirty_accountable, int prot_numa); |
| 1235 | extern int mprotect_fixup(struct vm_area_struct *vma, |
| 1236 | struct vm_area_struct **pprev, unsigned long start, |
| 1237 | unsigned long end, unsigned long newflags); |
| 1238 | |
| 1239 | /* |
| 1240 | * doesn't attempt to fault and will return short. |
| 1241 | */ |
| 1242 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, |
| 1243 | struct page **pages); |
| 1244 | /* |
| 1245 | * per-process(per-mm_struct) statistics. |
| 1246 | */ |
| 1247 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
| 1248 | { |
| 1249 | long val = atomic_long_read(&mm->rss_stat.count[member]); |
| 1250 | |
| 1251 | #ifdef SPLIT_RSS_COUNTING |
| 1252 | /* |
| 1253 | * counter is updated in asynchronous manner and may go to minus. |
| 1254 | * But it's never be expected number for users. |
| 1255 | */ |
| 1256 | if (val < 0) |
| 1257 | val = 0; |
| 1258 | #endif |
| 1259 | return (unsigned long)val; |
| 1260 | } |
| 1261 | |
| 1262 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) |
| 1263 | { |
| 1264 | atomic_long_add(value, &mm->rss_stat.count[member]); |
| 1265 | } |
| 1266 | |
| 1267 | static inline void inc_mm_counter(struct mm_struct *mm, int member) |
| 1268 | { |
| 1269 | atomic_long_inc(&mm->rss_stat.count[member]); |
| 1270 | } |
| 1271 | |
| 1272 | static inline void dec_mm_counter(struct mm_struct *mm, int member) |
| 1273 | { |
| 1274 | atomic_long_dec(&mm->rss_stat.count[member]); |
| 1275 | } |
| 1276 | |
| 1277 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
| 1278 | { |
| 1279 | return get_mm_counter(mm, MM_FILEPAGES) + |
| 1280 | get_mm_counter(mm, MM_ANONPAGES); |
| 1281 | } |
| 1282 | |
| 1283 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) |
| 1284 | { |
| 1285 | return max(mm->hiwater_rss, get_mm_rss(mm)); |
| 1286 | } |
| 1287 | |
| 1288 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) |
| 1289 | { |
| 1290 | return max(mm->hiwater_vm, mm->total_vm); |
| 1291 | } |
| 1292 | |
| 1293 | static inline void update_hiwater_rss(struct mm_struct *mm) |
| 1294 | { |
| 1295 | unsigned long _rss = get_mm_rss(mm); |
| 1296 | |
| 1297 | if ((mm)->hiwater_rss < _rss) |
| 1298 | (mm)->hiwater_rss = _rss; |
| 1299 | } |
| 1300 | |
| 1301 | static inline void update_hiwater_vm(struct mm_struct *mm) |
| 1302 | { |
| 1303 | if (mm->hiwater_vm < mm->total_vm) |
| 1304 | mm->hiwater_vm = mm->total_vm; |
| 1305 | } |
| 1306 | |
| 1307 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
| 1308 | struct mm_struct *mm) |
| 1309 | { |
| 1310 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); |
| 1311 | |
| 1312 | if (*maxrss < hiwater_rss) |
| 1313 | *maxrss = hiwater_rss; |
| 1314 | } |
| 1315 | |
| 1316 | #if defined(SPLIT_RSS_COUNTING) |
| 1317 | void sync_mm_rss(struct mm_struct *mm); |
| 1318 | #else |
| 1319 | static inline void sync_mm_rss(struct mm_struct *mm) |
| 1320 | { |
| 1321 | } |
| 1322 | #endif |
| 1323 | |
| 1324 | int vma_wants_writenotify(struct vm_area_struct *vma); |
| 1325 | |
| 1326 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
| 1327 | spinlock_t **ptl); |
| 1328 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, |
| 1329 | spinlock_t **ptl) |
| 1330 | { |
| 1331 | pte_t *ptep; |
| 1332 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); |
| 1333 | return ptep; |
| 1334 | } |
| 1335 | |
| 1336 | #ifdef __PAGETABLE_PUD_FOLDED |
| 1337 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, |
| 1338 | unsigned long address) |
| 1339 | { |
| 1340 | return 0; |
| 1341 | } |
| 1342 | #else |
| 1343 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
| 1344 | #endif |
| 1345 | |
| 1346 | #ifdef __PAGETABLE_PMD_FOLDED |
| 1347 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
| 1348 | unsigned long address) |
| 1349 | { |
| 1350 | return 0; |
| 1351 | } |
| 1352 | #else |
| 1353 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
| 1354 | #endif |
| 1355 | |
| 1356 | int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, |
| 1357 | pmd_t *pmd, unsigned long address); |
| 1358 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
| 1359 | |
| 1360 | /* |
| 1361 | * The following ifdef needed to get the 4level-fixup.h header to work. |
| 1362 | * Remove it when 4level-fixup.h has been removed. |
| 1363 | */ |
| 1364 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
| 1365 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
| 1366 | { |
| 1367 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
| 1368 | NULL: pud_offset(pgd, address); |
| 1369 | } |
| 1370 | |
| 1371 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) |
| 1372 | { |
| 1373 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
| 1374 | NULL: pmd_offset(pud, address); |
| 1375 | } |
| 1376 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
| 1377 | |
| 1378 | #if USE_SPLIT_PTE_PTLOCKS |
| 1379 | #if ALLOC_SPLIT_PTLOCKS |
| 1380 | void __init ptlock_cache_init(void); |
| 1381 | extern bool ptlock_alloc(struct page *page); |
| 1382 | extern void ptlock_free(struct page *page); |
| 1383 | |
| 1384 | static inline spinlock_t *ptlock_ptr(struct page *page) |
| 1385 | { |
| 1386 | return page->ptl; |
| 1387 | } |
| 1388 | #else /* ALLOC_SPLIT_PTLOCKS */ |
| 1389 | static inline void ptlock_cache_init(void) |
| 1390 | { |
| 1391 | } |
| 1392 | |
| 1393 | static inline bool ptlock_alloc(struct page *page) |
| 1394 | { |
| 1395 | return true; |
| 1396 | } |
| 1397 | |
| 1398 | static inline void ptlock_free(struct page *page) |
| 1399 | { |
| 1400 | } |
| 1401 | |
| 1402 | static inline spinlock_t *ptlock_ptr(struct page *page) |
| 1403 | { |
| 1404 | return &page->ptl; |
| 1405 | } |
| 1406 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
| 1407 | |
| 1408 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| 1409 | { |
| 1410 | return ptlock_ptr(pmd_page(*pmd)); |
| 1411 | } |
| 1412 | |
| 1413 | static inline bool ptlock_init(struct page *page) |
| 1414 | { |
| 1415 | /* |
| 1416 | * prep_new_page() initialize page->private (and therefore page->ptl) |
| 1417 | * with 0. Make sure nobody took it in use in between. |
| 1418 | * |
| 1419 | * It can happen if arch try to use slab for page table allocation: |
| 1420 | * slab code uses page->slab_cache and page->first_page (for tail |
| 1421 | * pages), which share storage with page->ptl. |
| 1422 | */ |
| 1423 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
| 1424 | if (!ptlock_alloc(page)) |
| 1425 | return false; |
| 1426 | spin_lock_init(ptlock_ptr(page)); |
| 1427 | return true; |
| 1428 | } |
| 1429 | |
| 1430 | /* Reset page->mapping so free_pages_check won't complain. */ |
| 1431 | static inline void pte_lock_deinit(struct page *page) |
| 1432 | { |
| 1433 | page->mapping = NULL; |
| 1434 | ptlock_free(page); |
| 1435 | } |
| 1436 | |
| 1437 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
| 1438 | /* |
| 1439 | * We use mm->page_table_lock to guard all pagetable pages of the mm. |
| 1440 | */ |
| 1441 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| 1442 | { |
| 1443 | return &mm->page_table_lock; |
| 1444 | } |
| 1445 | static inline void ptlock_cache_init(void) {} |
| 1446 | static inline bool ptlock_init(struct page *page) { return true; } |
| 1447 | static inline void pte_lock_deinit(struct page *page) {} |
| 1448 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
| 1449 | |
| 1450 | static inline void pgtable_init(void) |
| 1451 | { |
| 1452 | ptlock_cache_init(); |
| 1453 | pgtable_cache_init(); |
| 1454 | } |
| 1455 | |
| 1456 | static inline bool pgtable_page_ctor(struct page *page) |
| 1457 | { |
| 1458 | inc_zone_page_state(page, NR_PAGETABLE); |
| 1459 | return ptlock_init(page); |
| 1460 | } |
| 1461 | |
| 1462 | static inline void pgtable_page_dtor(struct page *page) |
| 1463 | { |
| 1464 | pte_lock_deinit(page); |
| 1465 | dec_zone_page_state(page, NR_PAGETABLE); |
| 1466 | } |
| 1467 | |
| 1468 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
| 1469 | ({ \ |
| 1470 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
| 1471 | pte_t *__pte = pte_offset_map(pmd, address); \ |
| 1472 | *(ptlp) = __ptl; \ |
| 1473 | spin_lock(__ptl); \ |
| 1474 | __pte; \ |
| 1475 | }) |
| 1476 | |
| 1477 | #define pte_unmap_unlock(pte, ptl) do { \ |
| 1478 | spin_unlock(ptl); \ |
| 1479 | pte_unmap(pte); \ |
| 1480 | } while (0) |
| 1481 | |
| 1482 | #define pte_alloc_map(mm, vma, pmd, address) \ |
| 1483 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \ |
| 1484 | pmd, address))? \ |
| 1485 | NULL: pte_offset_map(pmd, address)) |
| 1486 | |
| 1487 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
| 1488 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \ |
| 1489 | pmd, address))? \ |
| 1490 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) |
| 1491 | |
| 1492 | #define pte_alloc_kernel(pmd, address) \ |
| 1493 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
| 1494 | NULL: pte_offset_kernel(pmd, address)) |
| 1495 | |
| 1496 | #if USE_SPLIT_PMD_PTLOCKS |
| 1497 | |
| 1498 | static struct page *pmd_to_page(pmd_t *pmd) |
| 1499 | { |
| 1500 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); |
| 1501 | return virt_to_page((void *)((unsigned long) pmd & mask)); |
| 1502 | } |
| 1503 | |
| 1504 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| 1505 | { |
| 1506 | return ptlock_ptr(pmd_to_page(pmd)); |
| 1507 | } |
| 1508 | |
| 1509 | static inline bool pgtable_pmd_page_ctor(struct page *page) |
| 1510 | { |
| 1511 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 1512 | page->pmd_huge_pte = NULL; |
| 1513 | #endif |
| 1514 | return ptlock_init(page); |
| 1515 | } |
| 1516 | |
| 1517 | static inline void pgtable_pmd_page_dtor(struct page *page) |
| 1518 | { |
| 1519 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 1520 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
| 1521 | #endif |
| 1522 | ptlock_free(page); |
| 1523 | } |
| 1524 | |
| 1525 | #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte) |
| 1526 | |
| 1527 | #else |
| 1528 | |
| 1529 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| 1530 | { |
| 1531 | return &mm->page_table_lock; |
| 1532 | } |
| 1533 | |
| 1534 | static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } |
| 1535 | static inline void pgtable_pmd_page_dtor(struct page *page) {} |
| 1536 | |
| 1537 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
| 1538 | |
| 1539 | #endif |
| 1540 | |
| 1541 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
| 1542 | { |
| 1543 | spinlock_t *ptl = pmd_lockptr(mm, pmd); |
| 1544 | spin_lock(ptl); |
| 1545 | return ptl; |
| 1546 | } |
| 1547 | |
| 1548 | extern void free_area_init(unsigned long * zones_size); |
| 1549 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
| 1550 | unsigned long zone_start_pfn, unsigned long *zholes_size); |
| 1551 | extern void free_initmem(void); |
| 1552 | |
| 1553 | /* |
| 1554 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) |
| 1555 | * into the buddy system. The freed pages will be poisoned with pattern |
| 1556 | * "poison" if it's within range [0, UCHAR_MAX]. |
| 1557 | * Return pages freed into the buddy system. |
| 1558 | */ |
| 1559 | extern unsigned long free_reserved_area(void *start, void *end, |
| 1560 | int poison, char *s); |
| 1561 | |
| 1562 | #ifdef CONFIG_HIGHMEM |
| 1563 | /* |
| 1564 | * Free a highmem page into the buddy system, adjusting totalhigh_pages |
| 1565 | * and totalram_pages. |
| 1566 | */ |
| 1567 | extern void free_highmem_page(struct page *page); |
| 1568 | #endif |
| 1569 | |
| 1570 | extern void adjust_managed_page_count(struct page *page, long count); |
| 1571 | extern void mem_init_print_info(const char *str); |
| 1572 | |
| 1573 | /* Free the reserved page into the buddy system, so it gets managed. */ |
| 1574 | static inline void __free_reserved_page(struct page *page) |
| 1575 | { |
| 1576 | ClearPageReserved(page); |
| 1577 | init_page_count(page); |
| 1578 | __free_page(page); |
| 1579 | } |
| 1580 | |
| 1581 | static inline void free_reserved_page(struct page *page) |
| 1582 | { |
| 1583 | __free_reserved_page(page); |
| 1584 | adjust_managed_page_count(page, 1); |
| 1585 | } |
| 1586 | |
| 1587 | static inline void mark_page_reserved(struct page *page) |
| 1588 | { |
| 1589 | SetPageReserved(page); |
| 1590 | adjust_managed_page_count(page, -1); |
| 1591 | } |
| 1592 | |
| 1593 | /* |
| 1594 | * Default method to free all the __init memory into the buddy system. |
| 1595 | * The freed pages will be poisoned with pattern "poison" if it's within |
| 1596 | * range [0, UCHAR_MAX]. |
| 1597 | * Return pages freed into the buddy system. |
| 1598 | */ |
| 1599 | static inline unsigned long free_initmem_default(int poison) |
| 1600 | { |
| 1601 | extern char __init_begin[], __init_end[]; |
| 1602 | |
| 1603 | return free_reserved_area(&__init_begin, &__init_end, |
| 1604 | poison, "unused kernel"); |
| 1605 | } |
| 1606 | |
| 1607 | static inline unsigned long get_num_physpages(void) |
| 1608 | { |
| 1609 | int nid; |
| 1610 | unsigned long phys_pages = 0; |
| 1611 | |
| 1612 | for_each_online_node(nid) |
| 1613 | phys_pages += node_present_pages(nid); |
| 1614 | |
| 1615 | return phys_pages; |
| 1616 | } |
| 1617 | |
| 1618 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
| 1619 | /* |
| 1620 | * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its |
| 1621 | * zones, allocate the backing mem_map and account for memory holes in a more |
| 1622 | * architecture independent manner. This is a substitute for creating the |
| 1623 | * zone_sizes[] and zholes_size[] arrays and passing them to |
| 1624 | * free_area_init_node() |
| 1625 | * |
| 1626 | * An architecture is expected to register range of page frames backed by |
| 1627 | * physical memory with memblock_add[_node]() before calling |
| 1628 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
| 1629 | * usage, an architecture is expected to do something like |
| 1630 | * |
| 1631 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, |
| 1632 | * max_highmem_pfn}; |
| 1633 | * for_each_valid_physical_page_range() |
| 1634 | * memblock_add_node(base, size, nid) |
| 1635 | * free_area_init_nodes(max_zone_pfns); |
| 1636 | * |
| 1637 | * free_bootmem_with_active_regions() calls free_bootmem_node() for each |
| 1638 | * registered physical page range. Similarly |
| 1639 | * sparse_memory_present_with_active_regions() calls memory_present() for |
| 1640 | * each range when SPARSEMEM is enabled. |
| 1641 | * |
| 1642 | * See mm/page_alloc.c for more information on each function exposed by |
| 1643 | * CONFIG_HAVE_MEMBLOCK_NODE_MAP. |
| 1644 | */ |
| 1645 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); |
| 1646 | unsigned long node_map_pfn_alignment(void); |
| 1647 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
| 1648 | unsigned long end_pfn); |
| 1649 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
| 1650 | unsigned long end_pfn); |
| 1651 | extern void get_pfn_range_for_nid(unsigned int nid, |
| 1652 | unsigned long *start_pfn, unsigned long *end_pfn); |
| 1653 | extern unsigned long find_min_pfn_with_active_regions(void); |
| 1654 | extern void free_bootmem_with_active_regions(int nid, |
| 1655 | unsigned long max_low_pfn); |
| 1656 | extern void sparse_memory_present_with_active_regions(int nid); |
| 1657 | |
| 1658 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
| 1659 | |
| 1660 | #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ |
| 1661 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) |
| 1662 | static inline int __early_pfn_to_nid(unsigned long pfn) |
| 1663 | { |
| 1664 | return 0; |
| 1665 | } |
| 1666 | #else |
| 1667 | /* please see mm/page_alloc.c */ |
| 1668 | extern int __meminit early_pfn_to_nid(unsigned long pfn); |
| 1669 | /* there is a per-arch backend function. */ |
| 1670 | extern int __meminit __early_pfn_to_nid(unsigned long pfn); |
| 1671 | #endif |
| 1672 | |
| 1673 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
| 1674 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
| 1675 | unsigned long, enum memmap_context); |
| 1676 | extern void setup_per_zone_wmarks(void); |
| 1677 | extern int __meminit init_per_zone_wmark_min(void); |
| 1678 | extern void mem_init(void); |
| 1679 | extern void __init mmap_init(void); |
| 1680 | extern void show_mem(unsigned int flags); |
| 1681 | extern void si_meminfo(struct sysinfo * val); |
| 1682 | extern void si_meminfo_node(struct sysinfo *val, int nid); |
| 1683 | |
| 1684 | extern __printf(3, 4) |
| 1685 | void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...); |
| 1686 | |
| 1687 | extern void setup_per_cpu_pageset(void); |
| 1688 | |
| 1689 | extern void zone_pcp_update(struct zone *zone); |
| 1690 | extern void zone_pcp_reset(struct zone *zone); |
| 1691 | |
| 1692 | /* page_alloc.c */ |
| 1693 | extern int min_free_kbytes; |
| 1694 | |
| 1695 | /* nommu.c */ |
| 1696 | extern atomic_long_t mmap_pages_allocated; |
| 1697 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
| 1698 | |
| 1699 | /* interval_tree.c */ |
| 1700 | void vma_interval_tree_insert(struct vm_area_struct *node, |
| 1701 | struct rb_root *root); |
| 1702 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
| 1703 | struct vm_area_struct *prev, |
| 1704 | struct rb_root *root); |
| 1705 | void vma_interval_tree_remove(struct vm_area_struct *node, |
| 1706 | struct rb_root *root); |
| 1707 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root, |
| 1708 | unsigned long start, unsigned long last); |
| 1709 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, |
| 1710 | unsigned long start, unsigned long last); |
| 1711 | |
| 1712 | #define vma_interval_tree_foreach(vma, root, start, last) \ |
| 1713 | for (vma = vma_interval_tree_iter_first(root, start, last); \ |
| 1714 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) |
| 1715 | |
| 1716 | static inline void vma_nonlinear_insert(struct vm_area_struct *vma, |
| 1717 | struct list_head *list) |
| 1718 | { |
| 1719 | list_add_tail(&vma->shared.nonlinear, list); |
| 1720 | } |
| 1721 | |
| 1722 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
| 1723 | struct rb_root *root); |
| 1724 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, |
| 1725 | struct rb_root *root); |
| 1726 | struct anon_vma_chain *anon_vma_interval_tree_iter_first( |
| 1727 | struct rb_root *root, unsigned long start, unsigned long last); |
| 1728 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( |
| 1729 | struct anon_vma_chain *node, unsigned long start, unsigned long last); |
| 1730 | #ifdef CONFIG_DEBUG_VM_RB |
| 1731 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); |
| 1732 | #endif |
| 1733 | |
| 1734 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ |
| 1735 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ |
| 1736 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) |
| 1737 | |
| 1738 | /* mmap.c */ |
| 1739 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
| 1740 | extern int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
| 1741 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
| 1742 | extern struct vm_area_struct *vma_merge(struct mm_struct *, |
| 1743 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, |
| 1744 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, |
| 1745 | struct mempolicy *); |
| 1746 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
| 1747 | extern int split_vma(struct mm_struct *, |
| 1748 | struct vm_area_struct *, unsigned long addr, int new_below); |
| 1749 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
| 1750 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, |
| 1751 | struct rb_node **, struct rb_node *); |
| 1752 | extern void unlink_file_vma(struct vm_area_struct *); |
| 1753 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
| 1754 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
| 1755 | bool *need_rmap_locks); |
| 1756 | extern void exit_mmap(struct mm_struct *); |
| 1757 | |
| 1758 | extern int mm_take_all_locks(struct mm_struct *mm); |
| 1759 | extern void mm_drop_all_locks(struct mm_struct *mm); |
| 1760 | |
| 1761 | extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
| 1762 | extern struct file *get_mm_exe_file(struct mm_struct *mm); |
| 1763 | |
| 1764 | extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); |
| 1765 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
| 1766 | unsigned long addr, unsigned long len, |
| 1767 | unsigned long flags, struct page **pages); |
| 1768 | extern int install_special_mapping(struct mm_struct *mm, |
| 1769 | unsigned long addr, unsigned long len, |
| 1770 | unsigned long flags, struct page **pages); |
| 1771 | |
| 1772 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| 1773 | |
| 1774 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
| 1775 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff); |
| 1776 | extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, |
| 1777 | unsigned long len, unsigned long prot, unsigned long flags, |
| 1778 | unsigned long pgoff, unsigned long *populate); |
| 1779 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
| 1780 | |
| 1781 | #ifdef CONFIG_MMU |
| 1782 | extern int __mm_populate(unsigned long addr, unsigned long len, |
| 1783 | int ignore_errors); |
| 1784 | static inline void mm_populate(unsigned long addr, unsigned long len) |
| 1785 | { |
| 1786 | /* Ignore errors */ |
| 1787 | (void) __mm_populate(addr, len, 1); |
| 1788 | } |
| 1789 | #else |
| 1790 | static inline void mm_populate(unsigned long addr, unsigned long len) {} |
| 1791 | #endif |
| 1792 | |
| 1793 | /* These take the mm semaphore themselves */ |
| 1794 | extern unsigned long vm_brk(unsigned long, unsigned long); |
| 1795 | extern int vm_munmap(unsigned long, size_t); |
| 1796 | extern unsigned long vm_mmap(struct file *, unsigned long, |
| 1797 | unsigned long, unsigned long, |
| 1798 | unsigned long, unsigned long); |
| 1799 | |
| 1800 | struct vm_unmapped_area_info { |
| 1801 | #define VM_UNMAPPED_AREA_TOPDOWN 1 |
| 1802 | unsigned long flags; |
| 1803 | unsigned long length; |
| 1804 | unsigned long low_limit; |
| 1805 | unsigned long high_limit; |
| 1806 | unsigned long align_mask; |
| 1807 | unsigned long align_offset; |
| 1808 | }; |
| 1809 | |
| 1810 | extern unsigned long unmapped_area(struct vm_unmapped_area_info *info); |
| 1811 | extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); |
| 1812 | |
| 1813 | /* |
| 1814 | * Search for an unmapped address range. |
| 1815 | * |
| 1816 | * We are looking for a range that: |
| 1817 | * - does not intersect with any VMA; |
| 1818 | * - is contained within the [low_limit, high_limit) interval; |
| 1819 | * - is at least the desired size. |
| 1820 | * - satisfies (begin_addr & align_mask) == (align_offset & align_mask) |
| 1821 | */ |
| 1822 | static inline unsigned long |
| 1823 | vm_unmapped_area(struct vm_unmapped_area_info *info) |
| 1824 | { |
| 1825 | if (!(info->flags & VM_UNMAPPED_AREA_TOPDOWN)) |
| 1826 | return unmapped_area(info); |
| 1827 | else |
| 1828 | return unmapped_area_topdown(info); |
| 1829 | } |
| 1830 | |
| 1831 | /* truncate.c */ |
| 1832 | extern void truncate_inode_pages(struct address_space *, loff_t); |
| 1833 | extern void truncate_inode_pages_range(struct address_space *, |
| 1834 | loff_t lstart, loff_t lend); |
| 1835 | extern void truncate_inode_pages_final(struct address_space *); |
| 1836 | |
| 1837 | /* generic vm_area_ops exported for stackable file systems */ |
| 1838 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
| 1839 | extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
| 1840 | |
| 1841 | /* mm/page-writeback.c */ |
| 1842 | int write_one_page(struct page *page, int wait); |
| 1843 | void task_dirty_inc(struct task_struct *tsk); |
| 1844 | |
| 1845 | /* readahead.c */ |
| 1846 | #define VM_MAX_READAHEAD 128 /* kbytes */ |
| 1847 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ |
| 1848 | |
| 1849 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
| 1850 | pgoff_t offset, unsigned long nr_to_read); |
| 1851 | |
| 1852 | void page_cache_sync_readahead(struct address_space *mapping, |
| 1853 | struct file_ra_state *ra, |
| 1854 | struct file *filp, |
| 1855 | pgoff_t offset, |
| 1856 | unsigned long size); |
| 1857 | |
| 1858 | void page_cache_async_readahead(struct address_space *mapping, |
| 1859 | struct file_ra_state *ra, |
| 1860 | struct file *filp, |
| 1861 | struct page *pg, |
| 1862 | pgoff_t offset, |
| 1863 | unsigned long size); |
| 1864 | |
| 1865 | unsigned long max_sane_readahead(unsigned long nr); |
| 1866 | unsigned long ra_submit(struct file_ra_state *ra, |
| 1867 | struct address_space *mapping, |
| 1868 | struct file *filp); |
| 1869 | |
| 1870 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
| 1871 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
| 1872 | |
| 1873 | /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */ |
| 1874 | extern int expand_downwards(struct vm_area_struct *vma, |
| 1875 | unsigned long address); |
| 1876 | #if VM_GROWSUP |
| 1877 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
| 1878 | #else |
| 1879 | #define expand_upwards(vma, address) do { } while (0) |
| 1880 | #endif |
| 1881 | |
| 1882 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ |
| 1883 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); |
| 1884 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, |
| 1885 | struct vm_area_struct **pprev); |
| 1886 | |
| 1887 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, |
| 1888 | NULL if none. Assume start_addr < end_addr. */ |
| 1889 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) |
| 1890 | { |
| 1891 | struct vm_area_struct * vma = find_vma(mm,start_addr); |
| 1892 | |
| 1893 | if (vma && end_addr <= vma->vm_start) |
| 1894 | vma = NULL; |
| 1895 | return vma; |
| 1896 | } |
| 1897 | |
| 1898 | static inline unsigned long vma_pages(struct vm_area_struct *vma) |
| 1899 | { |
| 1900 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
| 1901 | } |
| 1902 | |
| 1903 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
| 1904 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, |
| 1905 | unsigned long vm_start, unsigned long vm_end) |
| 1906 | { |
| 1907 | struct vm_area_struct *vma = find_vma(mm, vm_start); |
| 1908 | |
| 1909 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) |
| 1910 | vma = NULL; |
| 1911 | |
| 1912 | return vma; |
| 1913 | } |
| 1914 | |
| 1915 | #ifdef CONFIG_MMU |
| 1916 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
| 1917 | #else |
| 1918 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) |
| 1919 | { |
| 1920 | return __pgprot(0); |
| 1921 | } |
| 1922 | #endif |
| 1923 | |
| 1924 | #ifdef CONFIG_NUMA_BALANCING |
| 1925 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
| 1926 | unsigned long start, unsigned long end); |
| 1927 | #endif |
| 1928 | |
| 1929 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
| 1930 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
| 1931 | unsigned long pfn, unsigned long size, pgprot_t); |
| 1932 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
| 1933 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
| 1934 | unsigned long pfn); |
| 1935 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
| 1936 | unsigned long pfn); |
| 1937 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
| 1938 | |
| 1939 | |
| 1940 | struct page *follow_page_mask(struct vm_area_struct *vma, |
| 1941 | unsigned long address, unsigned int foll_flags, |
| 1942 | unsigned int *page_mask); |
| 1943 | |
| 1944 | static inline struct page *follow_page(struct vm_area_struct *vma, |
| 1945 | unsigned long address, unsigned int foll_flags) |
| 1946 | { |
| 1947 | unsigned int unused_page_mask; |
| 1948 | return follow_page_mask(vma, address, foll_flags, &unused_page_mask); |
| 1949 | } |
| 1950 | |
| 1951 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
| 1952 | #define FOLL_TOUCH 0x02 /* mark page accessed */ |
| 1953 | #define FOLL_GET 0x04 /* do get_page on page */ |
| 1954 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
| 1955 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
| 1956 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
| 1957 | * and return without waiting upon it */ |
| 1958 | #define FOLL_MLOCK 0x40 /* mark page as mlocked */ |
| 1959 | #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ |
| 1960 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
| 1961 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
| 1962 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
| 1963 | |
| 1964 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
| 1965 | void *data); |
| 1966 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, |
| 1967 | unsigned long size, pte_fn_t fn, void *data); |
| 1968 | |
| 1969 | #ifdef CONFIG_PROC_FS |
| 1970 | void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); |
| 1971 | #else |
| 1972 | static inline void vm_stat_account(struct mm_struct *mm, |
| 1973 | unsigned long flags, struct file *file, long pages) |
| 1974 | { |
| 1975 | mm->total_vm += pages; |
| 1976 | } |
| 1977 | #endif /* CONFIG_PROC_FS */ |
| 1978 | |
| 1979 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 1980 | extern void kernel_map_pages(struct page *page, int numpages, int enable); |
| 1981 | #ifdef CONFIG_HIBERNATION |
| 1982 | extern bool kernel_page_present(struct page *page); |
| 1983 | #endif /* CONFIG_HIBERNATION */ |
| 1984 | #else |
| 1985 | static inline void |
| 1986 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
| 1987 | #ifdef CONFIG_HIBERNATION |
| 1988 | static inline bool kernel_page_present(struct page *page) { return true; } |
| 1989 | #endif /* CONFIG_HIBERNATION */ |
| 1990 | #endif |
| 1991 | |
| 1992 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
| 1993 | #ifdef __HAVE_ARCH_GATE_AREA |
| 1994 | int in_gate_area_no_mm(unsigned long addr); |
| 1995 | int in_gate_area(struct mm_struct *mm, unsigned long addr); |
| 1996 | #else |
| 1997 | int in_gate_area_no_mm(unsigned long addr); |
| 1998 | #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);}) |
| 1999 | #endif /* __HAVE_ARCH_GATE_AREA */ |
| 2000 | |
| 2001 | #ifdef CONFIG_SYSCTL |
| 2002 | extern int sysctl_drop_caches; |
| 2003 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
| 2004 | void __user *, size_t *, loff_t *); |
| 2005 | #endif |
| 2006 | |
| 2007 | unsigned long shrink_slab(struct shrink_control *shrink, |
| 2008 | unsigned long nr_pages_scanned, |
| 2009 | unsigned long lru_pages); |
| 2010 | |
| 2011 | #ifndef CONFIG_MMU |
| 2012 | #define randomize_va_space 0 |
| 2013 | #else |
| 2014 | extern int randomize_va_space; |
| 2015 | #endif |
| 2016 | |
| 2017 | const char * arch_vma_name(struct vm_area_struct *vma); |
| 2018 | void print_vma_addr(char *prefix, unsigned long rip); |
| 2019 | |
| 2020 | void sparse_mem_maps_populate_node(struct page **map_map, |
| 2021 | unsigned long pnum_begin, |
| 2022 | unsigned long pnum_end, |
| 2023 | unsigned long map_count, |
| 2024 | int nodeid); |
| 2025 | |
| 2026 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
| 2027 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
| 2028 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); |
| 2029 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
| 2030 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); |
| 2031 | void *vmemmap_alloc_block(unsigned long size, int node); |
| 2032 | void *vmemmap_alloc_block_buf(unsigned long size, int node); |
| 2033 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
| 2034 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
| 2035 | int node); |
| 2036 | int vmemmap_populate(unsigned long start, unsigned long end, int node); |
| 2037 | void vmemmap_populate_print_last(void); |
| 2038 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 2039 | void vmemmap_free(unsigned long start, unsigned long end); |
| 2040 | #endif |
| 2041 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
| 2042 | unsigned long size); |
| 2043 | |
| 2044 | enum mf_flags { |
| 2045 | MF_COUNT_INCREASED = 1 << 0, |
| 2046 | MF_ACTION_REQUIRED = 1 << 1, |
| 2047 | MF_MUST_KILL = 1 << 2, |
| 2048 | MF_SOFT_OFFLINE = 1 << 3, |
| 2049 | }; |
| 2050 | extern int memory_failure(unsigned long pfn, int trapno, int flags); |
| 2051 | extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); |
| 2052 | extern int unpoison_memory(unsigned long pfn); |
| 2053 | extern int sysctl_memory_failure_early_kill; |
| 2054 | extern int sysctl_memory_failure_recovery; |
| 2055 | extern void shake_page(struct page *p, int access); |
| 2056 | extern atomic_long_t num_poisoned_pages; |
| 2057 | extern int soft_offline_page(struct page *page, int flags); |
| 2058 | |
| 2059 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
| 2060 | extern void clear_huge_page(struct page *page, |
| 2061 | unsigned long addr, |
| 2062 | unsigned int pages_per_huge_page); |
| 2063 | extern void copy_user_huge_page(struct page *dst, struct page *src, |
| 2064 | unsigned long addr, struct vm_area_struct *vma, |
| 2065 | unsigned int pages_per_huge_page); |
| 2066 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ |
| 2067 | |
| 2068 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 2069 | extern unsigned int _debug_guardpage_minorder; |
| 2070 | |
| 2071 | static inline unsigned int debug_guardpage_minorder(void) |
| 2072 | { |
| 2073 | return _debug_guardpage_minorder; |
| 2074 | } |
| 2075 | |
| 2076 | static inline bool page_is_guard(struct page *page) |
| 2077 | { |
| 2078 | return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags); |
| 2079 | } |
| 2080 | #else |
| 2081 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } |
| 2082 | static inline bool page_is_guard(struct page *page) { return false; } |
| 2083 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
| 2084 | |
| 2085 | #if MAX_NUMNODES > 1 |
| 2086 | void __init setup_nr_node_ids(void); |
| 2087 | #else |
| 2088 | static inline void setup_nr_node_ids(void) {} |
| 2089 | #endif |
| 2090 | |
| 2091 | #endif /* __KERNEL__ */ |
| 2092 | #endif /* _LINUX_MM_H */ |