| 1 | #ifndef _LINUX_MM_TYPES_H |
| 2 | #define _LINUX_MM_TYPES_H |
| 3 | |
| 4 | #include <linux/auxvec.h> |
| 5 | #include <linux/types.h> |
| 6 | #include <linux/threads.h> |
| 7 | #include <linux/list.h> |
| 8 | #include <linux/spinlock.h> |
| 9 | #include <linux/rbtree.h> |
| 10 | #include <linux/rwsem.h> |
| 11 | #include <linux/completion.h> |
| 12 | #include <linux/cpumask.h> |
| 13 | #include <linux/uprobes.h> |
| 14 | #include <linux/page-flags-layout.h> |
| 15 | #include <linux/workqueue.h> |
| 16 | #include <asm/page.h> |
| 17 | #include <asm/mmu.h> |
| 18 | |
| 19 | #ifndef AT_VECTOR_SIZE_ARCH |
| 20 | #define AT_VECTOR_SIZE_ARCH 0 |
| 21 | #endif |
| 22 | #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) |
| 23 | |
| 24 | struct address_space; |
| 25 | struct mem_cgroup; |
| 26 | |
| 27 | #define USE_SPLIT_PTE_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS) |
| 28 | #define USE_SPLIT_PMD_PTLOCKS (USE_SPLIT_PTE_PTLOCKS && \ |
| 29 | IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK)) |
| 30 | #define ALLOC_SPLIT_PTLOCKS (SPINLOCK_SIZE > BITS_PER_LONG/8) |
| 31 | |
| 32 | /* |
| 33 | * Each physical page in the system has a struct page associated with |
| 34 | * it to keep track of whatever it is we are using the page for at the |
| 35 | * moment. Note that we have no way to track which tasks are using |
| 36 | * a page, though if it is a pagecache page, rmap structures can tell us |
| 37 | * who is mapping it. |
| 38 | * |
| 39 | * The objects in struct page are organized in double word blocks in |
| 40 | * order to allows us to use atomic double word operations on portions |
| 41 | * of struct page. That is currently only used by slub but the arrangement |
| 42 | * allows the use of atomic double word operations on the flags/mapping |
| 43 | * and lru list pointers also. |
| 44 | */ |
| 45 | struct page { |
| 46 | /* First double word block */ |
| 47 | unsigned long flags; /* Atomic flags, some possibly |
| 48 | * updated asynchronously */ |
| 49 | union { |
| 50 | struct address_space *mapping; /* If low bit clear, points to |
| 51 | * inode address_space, or NULL. |
| 52 | * If page mapped as anonymous |
| 53 | * memory, low bit is set, and |
| 54 | * it points to anon_vma object: |
| 55 | * see PAGE_MAPPING_ANON below. |
| 56 | */ |
| 57 | void *s_mem; /* slab first object */ |
| 58 | atomic_t compound_mapcount; /* first tail page */ |
| 59 | /* page_deferred_list().next -- second tail page */ |
| 60 | }; |
| 61 | |
| 62 | /* Second double word */ |
| 63 | struct { |
| 64 | union { |
| 65 | pgoff_t index; /* Our offset within mapping. */ |
| 66 | void *freelist; /* sl[aou]b first free object */ |
| 67 | /* page_deferred_list().prev -- second tail page */ |
| 68 | }; |
| 69 | |
| 70 | union { |
| 71 | #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \ |
| 72 | defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) |
| 73 | /* Used for cmpxchg_double in slub */ |
| 74 | unsigned long counters; |
| 75 | #else |
| 76 | /* |
| 77 | * Keep _refcount separate from slub cmpxchg_double |
| 78 | * data. As the rest of the double word is protected by |
| 79 | * slab_lock but _refcount is not. |
| 80 | */ |
| 81 | unsigned counters; |
| 82 | #endif |
| 83 | |
| 84 | struct { |
| 85 | |
| 86 | union { |
| 87 | /* |
| 88 | * Count of ptes mapped in mms, to show |
| 89 | * when page is mapped & limit reverse |
| 90 | * map searches. |
| 91 | */ |
| 92 | atomic_t _mapcount; |
| 93 | |
| 94 | struct { /* SLUB */ |
| 95 | unsigned inuse:16; |
| 96 | unsigned objects:15; |
| 97 | unsigned frozen:1; |
| 98 | }; |
| 99 | int units; /* SLOB */ |
| 100 | }; |
| 101 | /* |
| 102 | * Usage count, *USE WRAPPER FUNCTION* |
| 103 | * when manual accounting. See page_ref.h |
| 104 | */ |
| 105 | atomic_t _refcount; |
| 106 | }; |
| 107 | unsigned int active; /* SLAB */ |
| 108 | }; |
| 109 | }; |
| 110 | |
| 111 | /* |
| 112 | * Third double word block |
| 113 | * |
| 114 | * WARNING: bit 0 of the first word encode PageTail(). That means |
| 115 | * the rest users of the storage space MUST NOT use the bit to |
| 116 | * avoid collision and false-positive PageTail(). |
| 117 | */ |
| 118 | union { |
| 119 | struct list_head lru; /* Pageout list, eg. active_list |
| 120 | * protected by zone->lru_lock ! |
| 121 | * Can be used as a generic list |
| 122 | * by the page owner. |
| 123 | */ |
| 124 | struct dev_pagemap *pgmap; /* ZONE_DEVICE pages are never on an |
| 125 | * lru or handled by a slab |
| 126 | * allocator, this points to the |
| 127 | * hosting device page map. |
| 128 | */ |
| 129 | struct { /* slub per cpu partial pages */ |
| 130 | struct page *next; /* Next partial slab */ |
| 131 | #ifdef CONFIG_64BIT |
| 132 | int pages; /* Nr of partial slabs left */ |
| 133 | int pobjects; /* Approximate # of objects */ |
| 134 | #else |
| 135 | short int pages; |
| 136 | short int pobjects; |
| 137 | #endif |
| 138 | }; |
| 139 | |
| 140 | struct rcu_head rcu_head; /* Used by SLAB |
| 141 | * when destroying via RCU |
| 142 | */ |
| 143 | /* Tail pages of compound page */ |
| 144 | struct { |
| 145 | unsigned long compound_head; /* If bit zero is set */ |
| 146 | |
| 147 | /* First tail page only */ |
| 148 | #ifdef CONFIG_64BIT |
| 149 | /* |
| 150 | * On 64 bit system we have enough space in struct page |
| 151 | * to encode compound_dtor and compound_order with |
| 152 | * unsigned int. It can help compiler generate better or |
| 153 | * smaller code on some archtectures. |
| 154 | */ |
| 155 | unsigned int compound_dtor; |
| 156 | unsigned int compound_order; |
| 157 | #else |
| 158 | unsigned short int compound_dtor; |
| 159 | unsigned short int compound_order; |
| 160 | #endif |
| 161 | }; |
| 162 | |
| 163 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && USE_SPLIT_PMD_PTLOCKS |
| 164 | struct { |
| 165 | unsigned long __pad; /* do not overlay pmd_huge_pte |
| 166 | * with compound_head to avoid |
| 167 | * possible bit 0 collision. |
| 168 | */ |
| 169 | pgtable_t pmd_huge_pte; /* protected by page->ptl */ |
| 170 | }; |
| 171 | #endif |
| 172 | }; |
| 173 | |
| 174 | /* Remainder is not double word aligned */ |
| 175 | union { |
| 176 | unsigned long private; /* Mapping-private opaque data: |
| 177 | * usually used for buffer_heads |
| 178 | * if PagePrivate set; used for |
| 179 | * swp_entry_t if PageSwapCache; |
| 180 | * indicates order in the buddy |
| 181 | * system if PG_buddy is set. |
| 182 | */ |
| 183 | #if USE_SPLIT_PTE_PTLOCKS |
| 184 | #if ALLOC_SPLIT_PTLOCKS |
| 185 | spinlock_t *ptl; |
| 186 | #else |
| 187 | spinlock_t ptl; |
| 188 | #endif |
| 189 | #endif |
| 190 | struct kmem_cache *slab_cache; /* SL[AU]B: Pointer to slab */ |
| 191 | }; |
| 192 | |
| 193 | #ifdef CONFIG_MEMCG |
| 194 | struct mem_cgroup *mem_cgroup; |
| 195 | #endif |
| 196 | |
| 197 | /* |
| 198 | * On machines where all RAM is mapped into kernel address space, |
| 199 | * we can simply calculate the virtual address. On machines with |
| 200 | * highmem some memory is mapped into kernel virtual memory |
| 201 | * dynamically, so we need a place to store that address. |
| 202 | * Note that this field could be 16 bits on x86 ... ;) |
| 203 | * |
| 204 | * Architectures with slow multiplication can define |
| 205 | * WANT_PAGE_VIRTUAL in asm/page.h |
| 206 | */ |
| 207 | #if defined(WANT_PAGE_VIRTUAL) |
| 208 | void *virtual; /* Kernel virtual address (NULL if |
| 209 | not kmapped, ie. highmem) */ |
| 210 | #endif /* WANT_PAGE_VIRTUAL */ |
| 211 | |
| 212 | #ifdef CONFIG_KMEMCHECK |
| 213 | /* |
| 214 | * kmemcheck wants to track the status of each byte in a page; this |
| 215 | * is a pointer to such a status block. NULL if not tracked. |
| 216 | */ |
| 217 | void *shadow; |
| 218 | #endif |
| 219 | |
| 220 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
| 221 | int _last_cpupid; |
| 222 | #endif |
| 223 | } |
| 224 | /* |
| 225 | * The struct page can be forced to be double word aligned so that atomic ops |
| 226 | * on double words work. The SLUB allocator can make use of such a feature. |
| 227 | */ |
| 228 | #ifdef CONFIG_HAVE_ALIGNED_STRUCT_PAGE |
| 229 | __aligned(2 * sizeof(unsigned long)) |
| 230 | #endif |
| 231 | ; |
| 232 | |
| 233 | struct page_frag { |
| 234 | struct page *page; |
| 235 | #if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536) |
| 236 | __u32 offset; |
| 237 | __u32 size; |
| 238 | #else |
| 239 | __u16 offset; |
| 240 | __u16 size; |
| 241 | #endif |
| 242 | }; |
| 243 | |
| 244 | #define PAGE_FRAG_CACHE_MAX_SIZE __ALIGN_MASK(32768, ~PAGE_MASK) |
| 245 | #define PAGE_FRAG_CACHE_MAX_ORDER get_order(PAGE_FRAG_CACHE_MAX_SIZE) |
| 246 | |
| 247 | struct page_frag_cache { |
| 248 | void * va; |
| 249 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) |
| 250 | __u16 offset; |
| 251 | __u16 size; |
| 252 | #else |
| 253 | __u32 offset; |
| 254 | #endif |
| 255 | /* we maintain a pagecount bias, so that we dont dirty cache line |
| 256 | * containing page->_refcount every time we allocate a fragment. |
| 257 | */ |
| 258 | unsigned int pagecnt_bias; |
| 259 | bool pfmemalloc; |
| 260 | }; |
| 261 | |
| 262 | typedef unsigned long vm_flags_t; |
| 263 | |
| 264 | /* |
| 265 | * A region containing a mapping of a non-memory backed file under NOMMU |
| 266 | * conditions. These are held in a global tree and are pinned by the VMAs that |
| 267 | * map parts of them. |
| 268 | */ |
| 269 | struct vm_region { |
| 270 | struct rb_node vm_rb; /* link in global region tree */ |
| 271 | vm_flags_t vm_flags; /* VMA vm_flags */ |
| 272 | unsigned long vm_start; /* start address of region */ |
| 273 | unsigned long vm_end; /* region initialised to here */ |
| 274 | unsigned long vm_top; /* region allocated to here */ |
| 275 | unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ |
| 276 | struct file *vm_file; /* the backing file or NULL */ |
| 277 | |
| 278 | int vm_usage; /* region usage count (access under nommu_region_sem) */ |
| 279 | bool vm_icache_flushed : 1; /* true if the icache has been flushed for |
| 280 | * this region */ |
| 281 | }; |
| 282 | |
| 283 | #ifdef CONFIG_USERFAULTFD |
| 284 | #define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) { NULL, }) |
| 285 | struct vm_userfaultfd_ctx { |
| 286 | struct userfaultfd_ctx *ctx; |
| 287 | }; |
| 288 | #else /* CONFIG_USERFAULTFD */ |
| 289 | #define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) {}) |
| 290 | struct vm_userfaultfd_ctx {}; |
| 291 | #endif /* CONFIG_USERFAULTFD */ |
| 292 | |
| 293 | /* |
| 294 | * This struct defines a memory VMM memory area. There is one of these |
| 295 | * per VM-area/task. A VM area is any part of the process virtual memory |
| 296 | * space that has a special rule for the page-fault handlers (ie a shared |
| 297 | * library, the executable area etc). |
| 298 | */ |
| 299 | struct vm_area_struct { |
| 300 | /* The first cache line has the info for VMA tree walking. */ |
| 301 | |
| 302 | unsigned long vm_start; /* Our start address within vm_mm. */ |
| 303 | unsigned long vm_end; /* The first byte after our end address |
| 304 | within vm_mm. */ |
| 305 | |
| 306 | /* linked list of VM areas per task, sorted by address */ |
| 307 | struct vm_area_struct *vm_next, *vm_prev; |
| 308 | |
| 309 | struct rb_node vm_rb; |
| 310 | |
| 311 | /* |
| 312 | * Largest free memory gap in bytes to the left of this VMA. |
| 313 | * Either between this VMA and vma->vm_prev, or between one of the |
| 314 | * VMAs below us in the VMA rbtree and its ->vm_prev. This helps |
| 315 | * get_unmapped_area find a free area of the right size. |
| 316 | */ |
| 317 | unsigned long rb_subtree_gap; |
| 318 | |
| 319 | /* Second cache line starts here. */ |
| 320 | |
| 321 | struct mm_struct *vm_mm; /* The address space we belong to. */ |
| 322 | pgprot_t vm_page_prot; /* Access permissions of this VMA. */ |
| 323 | unsigned long vm_flags; /* Flags, see mm.h. */ |
| 324 | |
| 325 | /* |
| 326 | * For areas with an address space and backing store, |
| 327 | * linkage into the address_space->i_mmap interval tree. |
| 328 | */ |
| 329 | struct { |
| 330 | struct rb_node rb; |
| 331 | unsigned long rb_subtree_last; |
| 332 | } shared; |
| 333 | |
| 334 | /* |
| 335 | * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma |
| 336 | * list, after a COW of one of the file pages. A MAP_SHARED vma |
| 337 | * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack |
| 338 | * or brk vma (with NULL file) can only be in an anon_vma list. |
| 339 | */ |
| 340 | struct list_head anon_vma_chain; /* Serialized by mmap_sem & |
| 341 | * page_table_lock */ |
| 342 | struct anon_vma *anon_vma; /* Serialized by page_table_lock */ |
| 343 | |
| 344 | /* Function pointers to deal with this struct. */ |
| 345 | const struct vm_operations_struct *vm_ops; |
| 346 | |
| 347 | /* Information about our backing store: */ |
| 348 | unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE |
| 349 | units */ |
| 350 | struct file * vm_file; /* File we map to (can be NULL). */ |
| 351 | void * vm_private_data; /* was vm_pte (shared mem) */ |
| 352 | |
| 353 | #ifndef CONFIG_MMU |
| 354 | struct vm_region *vm_region; /* NOMMU mapping region */ |
| 355 | #endif |
| 356 | #ifdef CONFIG_NUMA |
| 357 | struct mempolicy *vm_policy; /* NUMA policy for the VMA */ |
| 358 | #endif |
| 359 | struct vm_userfaultfd_ctx vm_userfaultfd_ctx; |
| 360 | }; |
| 361 | |
| 362 | struct core_thread { |
| 363 | struct task_struct *task; |
| 364 | struct core_thread *next; |
| 365 | }; |
| 366 | |
| 367 | struct core_state { |
| 368 | atomic_t nr_threads; |
| 369 | struct core_thread dumper; |
| 370 | struct completion startup; |
| 371 | }; |
| 372 | |
| 373 | enum { |
| 374 | MM_FILEPAGES, /* Resident file mapping pages */ |
| 375 | MM_ANONPAGES, /* Resident anonymous pages */ |
| 376 | MM_SWAPENTS, /* Anonymous swap entries */ |
| 377 | MM_SHMEMPAGES, /* Resident shared memory pages */ |
| 378 | NR_MM_COUNTERS |
| 379 | }; |
| 380 | |
| 381 | #if USE_SPLIT_PTE_PTLOCKS && defined(CONFIG_MMU) |
| 382 | #define SPLIT_RSS_COUNTING |
| 383 | /* per-thread cached information, */ |
| 384 | struct task_rss_stat { |
| 385 | int events; /* for synchronization threshold */ |
| 386 | int count[NR_MM_COUNTERS]; |
| 387 | }; |
| 388 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
| 389 | |
| 390 | struct mm_rss_stat { |
| 391 | atomic_long_t count[NR_MM_COUNTERS]; |
| 392 | }; |
| 393 | |
| 394 | struct kioctx_table; |
| 395 | struct mm_struct { |
| 396 | struct vm_area_struct *mmap; /* list of VMAs */ |
| 397 | struct rb_root mm_rb; |
| 398 | u32 vmacache_seqnum; /* per-thread vmacache */ |
| 399 | #ifdef CONFIG_MMU |
| 400 | unsigned long (*get_unmapped_area) (struct file *filp, |
| 401 | unsigned long addr, unsigned long len, |
| 402 | unsigned long pgoff, unsigned long flags); |
| 403 | #endif |
| 404 | unsigned long mmap_base; /* base of mmap area */ |
| 405 | unsigned long mmap_legacy_base; /* base of mmap area in bottom-up allocations */ |
| 406 | unsigned long task_size; /* size of task vm space */ |
| 407 | unsigned long highest_vm_end; /* highest vma end address */ |
| 408 | pgd_t * pgd; |
| 409 | atomic_t mm_users; /* How many users with user space? */ |
| 410 | atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ |
| 411 | atomic_long_t nr_ptes; /* PTE page table pages */ |
| 412 | #if CONFIG_PGTABLE_LEVELS > 2 |
| 413 | atomic_long_t nr_pmds; /* PMD page table pages */ |
| 414 | #endif |
| 415 | int map_count; /* number of VMAs */ |
| 416 | |
| 417 | spinlock_t page_table_lock; /* Protects page tables and some counters */ |
| 418 | struct rw_semaphore mmap_sem; |
| 419 | |
| 420 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung |
| 421 | * together off init_mm.mmlist, and are protected |
| 422 | * by mmlist_lock |
| 423 | */ |
| 424 | |
| 425 | |
| 426 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ |
| 427 | unsigned long hiwater_vm; /* High-water virtual memory usage */ |
| 428 | |
| 429 | unsigned long total_vm; /* Total pages mapped */ |
| 430 | unsigned long locked_vm; /* Pages that have PG_mlocked set */ |
| 431 | unsigned long pinned_vm; /* Refcount permanently increased */ |
| 432 | unsigned long data_vm; /* VM_WRITE & ~VM_SHARED & ~VM_STACK */ |
| 433 | unsigned long exec_vm; /* VM_EXEC & ~VM_WRITE & ~VM_STACK */ |
| 434 | unsigned long stack_vm; /* VM_STACK */ |
| 435 | unsigned long def_flags; |
| 436 | unsigned long start_code, end_code, start_data, end_data; |
| 437 | unsigned long start_brk, brk, start_stack; |
| 438 | unsigned long arg_start, arg_end, env_start, env_end; |
| 439 | |
| 440 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ |
| 441 | |
| 442 | /* |
| 443 | * Special counters, in some configurations protected by the |
| 444 | * page_table_lock, in other configurations by being atomic. |
| 445 | */ |
| 446 | struct mm_rss_stat rss_stat; |
| 447 | |
| 448 | struct linux_binfmt *binfmt; |
| 449 | |
| 450 | cpumask_var_t cpu_vm_mask_var; |
| 451 | |
| 452 | /* Architecture-specific MM context */ |
| 453 | mm_context_t context; |
| 454 | |
| 455 | unsigned long flags; /* Must use atomic bitops to access the bits */ |
| 456 | |
| 457 | struct core_state *core_state; /* coredumping support */ |
| 458 | #ifdef CONFIG_AIO |
| 459 | spinlock_t ioctx_lock; |
| 460 | struct kioctx_table __rcu *ioctx_table; |
| 461 | #endif |
| 462 | #ifdef CONFIG_MEMCG |
| 463 | /* |
| 464 | * "owner" points to a task that is regarded as the canonical |
| 465 | * user/owner of this mm. All of the following must be true in |
| 466 | * order for it to be changed: |
| 467 | * |
| 468 | * current == mm->owner |
| 469 | * current->mm != mm |
| 470 | * new_owner->mm == mm |
| 471 | * new_owner->alloc_lock is held |
| 472 | */ |
| 473 | struct task_struct __rcu *owner; |
| 474 | #endif |
| 475 | |
| 476 | /* store ref to file /proc/<pid>/exe symlink points to */ |
| 477 | struct file __rcu *exe_file; |
| 478 | #ifdef CONFIG_MMU_NOTIFIER |
| 479 | struct mmu_notifier_mm *mmu_notifier_mm; |
| 480 | #endif |
| 481 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS |
| 482 | pgtable_t pmd_huge_pte; /* protected by page_table_lock */ |
| 483 | #endif |
| 484 | #ifdef CONFIG_CPUMASK_OFFSTACK |
| 485 | struct cpumask cpumask_allocation; |
| 486 | #endif |
| 487 | #ifdef CONFIG_NUMA_BALANCING |
| 488 | /* |
| 489 | * numa_next_scan is the next time that the PTEs will be marked |
| 490 | * pte_numa. NUMA hinting faults will gather statistics and migrate |
| 491 | * pages to new nodes if necessary. |
| 492 | */ |
| 493 | unsigned long numa_next_scan; |
| 494 | |
| 495 | /* Restart point for scanning and setting pte_numa */ |
| 496 | unsigned long numa_scan_offset; |
| 497 | |
| 498 | /* numa_scan_seq prevents two threads setting pte_numa */ |
| 499 | int numa_scan_seq; |
| 500 | #endif |
| 501 | #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION) |
| 502 | /* |
| 503 | * An operation with batched TLB flushing is going on. Anything that |
| 504 | * can move process memory needs to flush the TLB when moving a |
| 505 | * PROT_NONE or PROT_NUMA mapped page. |
| 506 | */ |
| 507 | bool tlb_flush_pending; |
| 508 | #endif |
| 509 | struct uprobes_state uprobes_state; |
| 510 | #ifdef CONFIG_X86_INTEL_MPX |
| 511 | /* address of the bounds directory */ |
| 512 | void __user *bd_addr; |
| 513 | #endif |
| 514 | #ifdef CONFIG_HUGETLB_PAGE |
| 515 | atomic_long_t hugetlb_usage; |
| 516 | #endif |
| 517 | #ifdef CONFIG_MMU |
| 518 | struct work_struct async_put_work; |
| 519 | #endif |
| 520 | }; |
| 521 | |
| 522 | static inline void mm_init_cpumask(struct mm_struct *mm) |
| 523 | { |
| 524 | #ifdef CONFIG_CPUMASK_OFFSTACK |
| 525 | mm->cpu_vm_mask_var = &mm->cpumask_allocation; |
| 526 | #endif |
| 527 | cpumask_clear(mm->cpu_vm_mask_var); |
| 528 | } |
| 529 | |
| 530 | /* Future-safe accessor for struct mm_struct's cpu_vm_mask. */ |
| 531 | static inline cpumask_t *mm_cpumask(struct mm_struct *mm) |
| 532 | { |
| 533 | return mm->cpu_vm_mask_var; |
| 534 | } |
| 535 | |
| 536 | #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION) |
| 537 | /* |
| 538 | * Memory barriers to keep this state in sync are graciously provided by |
| 539 | * the page table locks, outside of which no page table modifications happen. |
| 540 | * The barriers below prevent the compiler from re-ordering the instructions |
| 541 | * around the memory barriers that are already present in the code. |
| 542 | */ |
| 543 | static inline bool mm_tlb_flush_pending(struct mm_struct *mm) |
| 544 | { |
| 545 | barrier(); |
| 546 | return mm->tlb_flush_pending; |
| 547 | } |
| 548 | static inline void set_tlb_flush_pending(struct mm_struct *mm) |
| 549 | { |
| 550 | mm->tlb_flush_pending = true; |
| 551 | |
| 552 | /* |
| 553 | * Guarantee that the tlb_flush_pending store does not leak into the |
| 554 | * critical section updating the page tables |
| 555 | */ |
| 556 | smp_mb__before_spinlock(); |
| 557 | } |
| 558 | /* Clearing is done after a TLB flush, which also provides a barrier. */ |
| 559 | static inline void clear_tlb_flush_pending(struct mm_struct *mm) |
| 560 | { |
| 561 | barrier(); |
| 562 | mm->tlb_flush_pending = false; |
| 563 | } |
| 564 | #else |
| 565 | static inline bool mm_tlb_flush_pending(struct mm_struct *mm) |
| 566 | { |
| 567 | return false; |
| 568 | } |
| 569 | static inline void set_tlb_flush_pending(struct mm_struct *mm) |
| 570 | { |
| 571 | } |
| 572 | static inline void clear_tlb_flush_pending(struct mm_struct *mm) |
| 573 | { |
| 574 | } |
| 575 | #endif |
| 576 | |
| 577 | struct vm_fault; |
| 578 | |
| 579 | struct vm_special_mapping { |
| 580 | const char *name; /* The name, e.g. "[vdso]". */ |
| 581 | |
| 582 | /* |
| 583 | * If .fault is not provided, this points to a |
| 584 | * NULL-terminated array of pages that back the special mapping. |
| 585 | * |
| 586 | * This must not be NULL unless .fault is provided. |
| 587 | */ |
| 588 | struct page **pages; |
| 589 | |
| 590 | /* |
| 591 | * If non-NULL, then this is called to resolve page faults |
| 592 | * on the special mapping. If used, .pages is not checked. |
| 593 | */ |
| 594 | int (*fault)(const struct vm_special_mapping *sm, |
| 595 | struct vm_area_struct *vma, |
| 596 | struct vm_fault *vmf); |
| 597 | }; |
| 598 | |
| 599 | enum tlb_flush_reason { |
| 600 | TLB_FLUSH_ON_TASK_SWITCH, |
| 601 | TLB_REMOTE_SHOOTDOWN, |
| 602 | TLB_LOCAL_SHOOTDOWN, |
| 603 | TLB_LOCAL_MM_SHOOTDOWN, |
| 604 | TLB_REMOTE_SEND_IPI, |
| 605 | NR_TLB_FLUSH_REASONS, |
| 606 | }; |
| 607 | |
| 608 | /* |
| 609 | * A swap entry has to fit into a "unsigned long", as the entry is hidden |
| 610 | * in the "index" field of the swapper address space. |
| 611 | */ |
| 612 | typedef struct { |
| 613 | unsigned long val; |
| 614 | } swp_entry_t; |
| 615 | |
| 616 | #endif /* _LINUX_MM_TYPES_H */ |