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