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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
97d06609 CL |
2 | #ifndef MM_SLAB_H |
3 | #define MM_SLAB_H | |
89c2d061 VB |
4 | |
5 | #include <linux/reciprocal_div.h> | |
6 | #include <linux/list_lru.h> | |
7 | #include <linux/local_lock.h> | |
8 | #include <linux/random.h> | |
9 | #include <linux/kobject.h> | |
10 | #include <linux/sched/mm.h> | |
11 | #include <linux/memcontrol.h> | |
89c2d061 VB |
12 | #include <linux/kfence.h> |
13 | #include <linux/kasan.h> | |
14 | ||
97d06609 CL |
15 | /* |
16 | * Internal slab definitions | |
17 | */ | |
18 | ||
6801be4f PZ |
19 | #ifdef CONFIG_64BIT |
20 | # ifdef system_has_cmpxchg128 | |
21 | # define system_has_freelist_aba() system_has_cmpxchg128() | |
22 | # define try_cmpxchg_freelist try_cmpxchg128 | |
23 | # endif | |
24 | #define this_cpu_try_cmpxchg_freelist this_cpu_try_cmpxchg128 | |
25 | typedef u128 freelist_full_t; | |
26 | #else /* CONFIG_64BIT */ | |
27 | # ifdef system_has_cmpxchg64 | |
28 | # define system_has_freelist_aba() system_has_cmpxchg64() | |
29 | # define try_cmpxchg_freelist try_cmpxchg64 | |
30 | # endif | |
31 | #define this_cpu_try_cmpxchg_freelist this_cpu_try_cmpxchg64 | |
32 | typedef u64 freelist_full_t; | |
33 | #endif /* CONFIG_64BIT */ | |
34 | ||
35 | #if defined(system_has_freelist_aba) && !defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) | |
36 | #undef system_has_freelist_aba | |
37 | #endif | |
38 | ||
39 | /* | |
40 | * Freelist pointer and counter to cmpxchg together, avoids the typical ABA | |
41 | * problems with cmpxchg of just a pointer. | |
42 | */ | |
43 | typedef union { | |
44 | struct { | |
45 | void *freelist; | |
46 | unsigned long counter; | |
47 | }; | |
48 | freelist_full_t full; | |
49 | } freelist_aba_t; | |
50 | ||
d122019b MWO |
51 | /* Reuses the bits in struct page */ |
52 | struct slab { | |
53 | unsigned long __page_flags; | |
401fb12c | 54 | |
401fb12c | 55 | struct kmem_cache *slab_cache; |
d122019b | 56 | union { |
401fb12c | 57 | struct { |
130d4df5 VB |
58 | union { |
59 | struct list_head slab_list; | |
60 | #ifdef CONFIG_SLUB_CPU_PARTIAL | |
61 | struct { | |
62 | struct slab *next; | |
63 | int slabs; /* Nr of slabs left */ | |
64 | }; | |
65 | #endif | |
66 | }; | |
67 | /* Double-word boundary */ | |
130d4df5 | 68 | union { |
130d4df5 | 69 | struct { |
6801be4f PZ |
70 | void *freelist; /* first free object */ |
71 | union { | |
72 | unsigned long counters; | |
73 | struct { | |
74 | unsigned inuse:16; | |
75 | unsigned objects:15; | |
76 | unsigned frozen:1; | |
77 | }; | |
78 | }; | |
130d4df5 | 79 | }; |
6801be4f PZ |
80 | #ifdef system_has_freelist_aba |
81 | freelist_aba_t freelist_counter; | |
82 | #endif | |
130d4df5 | 83 | }; |
d122019b | 84 | }; |
130d4df5 | 85 | struct rcu_head rcu_head; |
d122019b | 86 | }; |
401fb12c VB |
87 | unsigned int __unused; |
88 | ||
d122019b MWO |
89 | atomic_t __page_refcount; |
90 | #ifdef CONFIG_MEMCG | |
91 | unsigned long memcg_data; | |
92 | #endif | |
93 | }; | |
94 | ||
95 | #define SLAB_MATCH(pg, sl) \ | |
96 | static_assert(offsetof(struct page, pg) == offsetof(struct slab, sl)) | |
97 | SLAB_MATCH(flags, __page_flags); | |
130d4df5 | 98 | SLAB_MATCH(compound_head, slab_cache); /* Ensure bit 0 is clear */ |
d122019b MWO |
99 | SLAB_MATCH(_refcount, __page_refcount); |
100 | #ifdef CONFIG_MEMCG | |
101 | SLAB_MATCH(memcg_data, memcg_data); | |
102 | #endif | |
103 | #undef SLAB_MATCH | |
104 | static_assert(sizeof(struct slab) <= sizeof(struct page)); | |
a9e0b9f2 | 105 | #if defined(system_has_freelist_aba) |
6801be4f | 106 | static_assert(IS_ALIGNED(offsetof(struct slab, freelist), sizeof(freelist_aba_t))); |
130d4df5 | 107 | #endif |
d122019b MWO |
108 | |
109 | /** | |
110 | * folio_slab - Converts from folio to slab. | |
111 | * @folio: The folio. | |
112 | * | |
113 | * Currently struct slab is a different representation of a folio where | |
114 | * folio_test_slab() is true. | |
115 | * | |
116 | * Return: The slab which contains this folio. | |
117 | */ | |
118 | #define folio_slab(folio) (_Generic((folio), \ | |
119 | const struct folio *: (const struct slab *)(folio), \ | |
120 | struct folio *: (struct slab *)(folio))) | |
121 | ||
122 | /** | |
123 | * slab_folio - The folio allocated for a slab | |
124 | * @slab: The slab. | |
125 | * | |
126 | * Slabs are allocated as folios that contain the individual objects and are | |
127 | * using some fields in the first struct page of the folio - those fields are | |
128 | * now accessed by struct slab. It is occasionally necessary to convert back to | |
129 | * a folio in order to communicate with the rest of the mm. Please use this | |
130 | * helper function instead of casting yourself, as the implementation may change | |
131 | * in the future. | |
132 | */ | |
133 | #define slab_folio(s) (_Generic((s), \ | |
134 | const struct slab *: (const struct folio *)s, \ | |
135 | struct slab *: (struct folio *)s)) | |
136 | ||
137 | /** | |
138 | * page_slab - Converts from first struct page to slab. | |
139 | * @p: The first (either head of compound or single) page of slab. | |
140 | * | |
141 | * A temporary wrapper to convert struct page to struct slab in situations where | |
142 | * we know the page is the compound head, or single order-0 page. | |
143 | * | |
144 | * Long-term ideally everything would work with struct slab directly or go | |
145 | * through folio to struct slab. | |
146 | * | |
147 | * Return: The slab which contains this page | |
148 | */ | |
149 | #define page_slab(p) (_Generic((p), \ | |
150 | const struct page *: (const struct slab *)(p), \ | |
151 | struct page *: (struct slab *)(p))) | |
152 | ||
153 | /** | |
154 | * slab_page - The first struct page allocated for a slab | |
155 | * @slab: The slab. | |
156 | * | |
157 | * A convenience wrapper for converting slab to the first struct page of the | |
158 | * underlying folio, to communicate with code not yet converted to folio or | |
159 | * struct slab. | |
160 | */ | |
161 | #define slab_page(s) folio_page(slab_folio(s), 0) | |
162 | ||
163 | /* | |
164 | * If network-based swap is enabled, sl*b must keep track of whether pages | |
165 | * were allocated from pfmemalloc reserves. | |
166 | */ | |
167 | static inline bool slab_test_pfmemalloc(const struct slab *slab) | |
168 | { | |
169 | return folio_test_active((struct folio *)slab_folio(slab)); | |
170 | } | |
171 | ||
172 | static inline void slab_set_pfmemalloc(struct slab *slab) | |
173 | { | |
174 | folio_set_active(slab_folio(slab)); | |
175 | } | |
176 | ||
177 | static inline void slab_clear_pfmemalloc(struct slab *slab) | |
178 | { | |
179 | folio_clear_active(slab_folio(slab)); | |
180 | } | |
181 | ||
182 | static inline void __slab_clear_pfmemalloc(struct slab *slab) | |
183 | { | |
184 | __folio_clear_active(slab_folio(slab)); | |
185 | } | |
186 | ||
187 | static inline void *slab_address(const struct slab *slab) | |
188 | { | |
189 | return folio_address(slab_folio(slab)); | |
190 | } | |
191 | ||
192 | static inline int slab_nid(const struct slab *slab) | |
193 | { | |
194 | return folio_nid(slab_folio(slab)); | |
195 | } | |
196 | ||
197 | static inline pg_data_t *slab_pgdat(const struct slab *slab) | |
198 | { | |
199 | return folio_pgdat(slab_folio(slab)); | |
200 | } | |
201 | ||
202 | static inline struct slab *virt_to_slab(const void *addr) | |
203 | { | |
204 | struct folio *folio = virt_to_folio(addr); | |
205 | ||
206 | if (!folio_test_slab(folio)) | |
207 | return NULL; | |
208 | ||
209 | return folio_slab(folio); | |
210 | } | |
211 | ||
212 | static inline int slab_order(const struct slab *slab) | |
213 | { | |
214 | return folio_order((struct folio *)slab_folio(slab)); | |
215 | } | |
216 | ||
217 | static inline size_t slab_size(const struct slab *slab) | |
218 | { | |
219 | return PAGE_SIZE << slab_order(slab); | |
220 | } | |
221 | ||
19975f83 VB |
222 | #ifdef CONFIG_SLUB_CPU_PARTIAL |
223 | #define slub_percpu_partial(c) ((c)->partial) | |
224 | ||
225 | #define slub_set_percpu_partial(c, p) \ | |
226 | ({ \ | |
227 | slub_percpu_partial(c) = (p)->next; \ | |
228 | }) | |
229 | ||
230 | #define slub_percpu_partial_read_once(c) READ_ONCE(slub_percpu_partial(c)) | |
231 | #else | |
232 | #define slub_percpu_partial(c) NULL | |
233 | ||
234 | #define slub_set_percpu_partial(c, p) | |
235 | ||
236 | #define slub_percpu_partial_read_once(c) NULL | |
237 | #endif // CONFIG_SLUB_CPU_PARTIAL | |
238 | ||
239 | /* | |
240 | * Word size structure that can be atomically updated or read and that | |
241 | * contains both the order and the number of objects that a slab of the | |
242 | * given order would contain. | |
243 | */ | |
244 | struct kmem_cache_order_objects { | |
245 | unsigned int x; | |
246 | }; | |
247 | ||
248 | /* | |
249 | * Slab cache management. | |
250 | */ | |
251 | struct kmem_cache { | |
252 | #ifndef CONFIG_SLUB_TINY | |
253 | struct kmem_cache_cpu __percpu *cpu_slab; | |
254 | #endif | |
255 | /* Used for retrieving partial slabs, etc. */ | |
256 | slab_flags_t flags; | |
257 | unsigned long min_partial; | |
258 | unsigned int size; /* Object size including metadata */ | |
259 | unsigned int object_size; /* Object size without metadata */ | |
260 | struct reciprocal_value reciprocal_size; | |
261 | unsigned int offset; /* Free pointer offset */ | |
262 | #ifdef CONFIG_SLUB_CPU_PARTIAL | |
263 | /* Number of per cpu partial objects to keep around */ | |
264 | unsigned int cpu_partial; | |
265 | /* Number of per cpu partial slabs to keep around */ | |
266 | unsigned int cpu_partial_slabs; | |
267 | #endif | |
268 | struct kmem_cache_order_objects oo; | |
269 | ||
270 | /* Allocation and freeing of slabs */ | |
271 | struct kmem_cache_order_objects min; | |
272 | gfp_t allocflags; /* gfp flags to use on each alloc */ | |
273 | int refcount; /* Refcount for slab cache destroy */ | |
274 | void (*ctor)(void *object); /* Object constructor */ | |
275 | unsigned int inuse; /* Offset to metadata */ | |
276 | unsigned int align; /* Alignment */ | |
277 | unsigned int red_left_pad; /* Left redzone padding size */ | |
278 | const char *name; /* Name (only for display!) */ | |
279 | struct list_head list; /* List of slab caches */ | |
280 | #ifdef CONFIG_SYSFS | |
281 | struct kobject kobj; /* For sysfs */ | |
282 | #endif | |
283 | #ifdef CONFIG_SLAB_FREELIST_HARDENED | |
284 | unsigned long random; | |
285 | #endif | |
286 | ||
287 | #ifdef CONFIG_NUMA | |
288 | /* | |
289 | * Defragmentation by allocating from a remote node. | |
290 | */ | |
291 | unsigned int remote_node_defrag_ratio; | |
292 | #endif | |
293 | ||
294 | #ifdef CONFIG_SLAB_FREELIST_RANDOM | |
295 | unsigned int *random_seq; | |
296 | #endif | |
297 | ||
298 | #ifdef CONFIG_KASAN_GENERIC | |
299 | struct kasan_cache kasan_info; | |
300 | #endif | |
301 | ||
302 | #ifdef CONFIG_HARDENED_USERCOPY | |
303 | unsigned int useroffset; /* Usercopy region offset */ | |
304 | unsigned int usersize; /* Usercopy region size */ | |
305 | #endif | |
306 | ||
307 | struct kmem_cache_node *node[MAX_NUMNODES]; | |
308 | }; | |
309 | ||
310 | #if defined(CONFIG_SYSFS) && !defined(CONFIG_SLUB_TINY) | |
311 | #define SLAB_SUPPORTS_SYSFS | |
312 | void sysfs_slab_unlink(struct kmem_cache *s); | |
313 | void sysfs_slab_release(struct kmem_cache *s); | |
314 | #else | |
315 | static inline void sysfs_slab_unlink(struct kmem_cache *s) { } | |
316 | static inline void sysfs_slab_release(struct kmem_cache *s) { } | |
317 | #endif | |
318 | ||
319 | void *fixup_red_left(struct kmem_cache *s, void *p); | |
320 | ||
321 | static inline void *nearest_obj(struct kmem_cache *cache, | |
322 | const struct slab *slab, void *x) | |
323 | { | |
324 | void *object = x - (x - slab_address(slab)) % cache->size; | |
325 | void *last_object = slab_address(slab) + | |
326 | (slab->objects - 1) * cache->size; | |
327 | void *result = (unlikely(object > last_object)) ? last_object : object; | |
328 | ||
329 | result = fixup_red_left(cache, result); | |
330 | return result; | |
331 | } | |
332 | ||
333 | /* Determine object index from a given position */ | |
334 | static inline unsigned int __obj_to_index(const struct kmem_cache *cache, | |
335 | void *addr, void *obj) | |
336 | { | |
337 | return reciprocal_divide(kasan_reset_tag(obj) - addr, | |
338 | cache->reciprocal_size); | |
339 | } | |
340 | ||
341 | static inline unsigned int obj_to_index(const struct kmem_cache *cache, | |
342 | const struct slab *slab, void *obj) | |
343 | { | |
344 | if (is_kfence_address(obj)) | |
345 | return 0; | |
346 | return __obj_to_index(cache, slab_address(slab), obj); | |
347 | } | |
348 | ||
349 | static inline int objs_per_slab(const struct kmem_cache *cache, | |
350 | const struct slab *slab) | |
351 | { | |
352 | return slab->objects; | |
353 | } | |
07f361b2 | 354 | |
97d06609 CL |
355 | /* |
356 | * State of the slab allocator. | |
357 | * | |
358 | * This is used to describe the states of the allocator during bootup. | |
359 | * Allocators use this to gradually bootstrap themselves. Most allocators | |
360 | * have the problem that the structures used for managing slab caches are | |
361 | * allocated from slab caches themselves. | |
362 | */ | |
363 | enum slab_state { | |
364 | DOWN, /* No slab functionality yet */ | |
365 | PARTIAL, /* SLUB: kmem_cache_node available */ | |
ce8eb6c4 | 366 | PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */ |
97d06609 CL |
367 | UP, /* Slab caches usable but not all extras yet */ |
368 | FULL /* Everything is working */ | |
369 | }; | |
370 | ||
371 | extern enum slab_state slab_state; | |
372 | ||
18004c5d CL |
373 | /* The slab cache mutex protects the management structures during changes */ |
374 | extern struct mutex slab_mutex; | |
9b030cb8 CL |
375 | |
376 | /* The list of all slab caches on the system */ | |
18004c5d CL |
377 | extern struct list_head slab_caches; |
378 | ||
9b030cb8 CL |
379 | /* The slab cache that manages slab cache information */ |
380 | extern struct kmem_cache *kmem_cache; | |
381 | ||
af3b5f87 VB |
382 | /* A table of kmalloc cache names and sizes */ |
383 | extern const struct kmalloc_info_struct { | |
cb5d9fb3 | 384 | const char *name[NR_KMALLOC_TYPES]; |
55de8b9c | 385 | unsigned int size; |
af3b5f87 VB |
386 | } kmalloc_info[]; |
387 | ||
f97d5f63 | 388 | /* Kmalloc array related functions */ |
34cc6990 | 389 | void setup_kmalloc_cache_index_table(void); |
d50112ed | 390 | void create_kmalloc_caches(slab_flags_t); |
2c59dd65 | 391 | |
5a9d31d9 VB |
392 | extern u8 kmalloc_size_index[24]; |
393 | ||
394 | static inline unsigned int size_index_elem(unsigned int bytes) | |
395 | { | |
396 | return (bytes - 1) / 8; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Find the kmem_cache structure that serves a given size of | |
401 | * allocation | |
402 | * | |
403 | * This assumes size is larger than zero and not larger than | |
404 | * KMALLOC_MAX_CACHE_SIZE and the caller must check that. | |
405 | */ | |
406 | static inline struct kmem_cache * | |
407 | kmalloc_slab(size_t size, gfp_t flags, unsigned long caller) | |
408 | { | |
409 | unsigned int index; | |
410 | ||
411 | if (size <= 192) | |
412 | index = kmalloc_size_index[size_index_elem(size)]; | |
413 | else | |
414 | index = fls(size - 1); | |
415 | ||
416 | return kmalloc_caches[kmalloc_type(flags, caller)][index]; | |
417 | } | |
ed4cd17e | 418 | |
44405099 | 419 | gfp_t kmalloc_fix_flags(gfp_t flags); |
f97d5f63 | 420 | |
9b030cb8 | 421 | /* Functions provided by the slab allocators */ |
d50112ed | 422 | int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags); |
97d06609 | 423 | |
89c2d061 | 424 | void __init kmem_cache_init(void); |
0c474d31 CM |
425 | void __init new_kmalloc_cache(int idx, enum kmalloc_cache_type type, |
426 | slab_flags_t flags); | |
45530c44 | 427 | extern void create_boot_cache(struct kmem_cache *, const char *name, |
361d575e AD |
428 | unsigned int size, slab_flags_t flags, |
429 | unsigned int useroffset, unsigned int usersize); | |
45530c44 | 430 | |
423c929c | 431 | int slab_unmergeable(struct kmem_cache *s); |
f4957d5b | 432 | struct kmem_cache *find_mergeable(unsigned size, unsigned align, |
d50112ed | 433 | slab_flags_t flags, const char *name, void (*ctor)(void *)); |
2633d7a0 | 434 | struct kmem_cache * |
f4957d5b | 435 | __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, |
d50112ed | 436 | slab_flags_t flags, void (*ctor)(void *)); |
423c929c | 437 | |
0293d1fd | 438 | slab_flags_t kmem_cache_flags(unsigned int object_size, |
37540008 | 439 | slab_flags_t flags, const char *name); |
cbb79694 | 440 | |
bb944290 FT |
441 | static inline bool is_kmalloc_cache(struct kmem_cache *s) |
442 | { | |
bb944290 | 443 | return (s->flags & SLAB_KMALLOC); |
bb944290 | 444 | } |
cbb79694 | 445 | |
d8843922 | 446 | /* Legal flag mask for kmem_cache_create(), for various configurations */ |
6d6ea1e9 NB |
447 | #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \ |
448 | SLAB_CACHE_DMA32 | SLAB_PANIC | \ | |
5f0d5a3a | 449 | SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS ) |
d8843922 | 450 | |
a9e0b9f2 | 451 | #ifdef CONFIG_SLUB_DEBUG |
d8843922 | 452 | #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ |
becfda68 | 453 | SLAB_TRACE | SLAB_CONSISTENCY_CHECKS) |
d8843922 GC |
454 | #else |
455 | #define SLAB_DEBUG_FLAGS (0) | |
456 | #endif | |
457 | ||
d8843922 | 458 | #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ |
6cd6d33c | 459 | SLAB_TEMPORARY | SLAB_ACCOUNT | \ |
d0bf7d57 | 460 | SLAB_NO_USER_FLAGS | SLAB_KMALLOC | SLAB_NO_MERGE) |
d8843922 | 461 | |
e70954fd | 462 | /* Common flags available with current configuration */ |
d8843922 GC |
463 | #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS) |
464 | ||
e70954fd TG |
465 | /* Common flags permitted for kmem_cache_create */ |
466 | #define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \ | |
467 | SLAB_RED_ZONE | \ | |
468 | SLAB_POISON | \ | |
469 | SLAB_STORE_USER | \ | |
470 | SLAB_TRACE | \ | |
471 | SLAB_CONSISTENCY_CHECKS | \ | |
472 | SLAB_MEM_SPREAD | \ | |
473 | SLAB_NOLEAKTRACE | \ | |
474 | SLAB_RECLAIM_ACCOUNT | \ | |
475 | SLAB_TEMPORARY | \ | |
a285909f | 476 | SLAB_ACCOUNT | \ |
6cd6d33c | 477 | SLAB_KMALLOC | \ |
d0bf7d57 | 478 | SLAB_NO_MERGE | \ |
a285909f | 479 | SLAB_NO_USER_FLAGS) |
e70954fd | 480 | |
f9e13c0a | 481 | bool __kmem_cache_empty(struct kmem_cache *); |
945cf2b6 | 482 | int __kmem_cache_shutdown(struct kmem_cache *); |
52b4b950 | 483 | void __kmem_cache_release(struct kmem_cache *); |
c9fc5864 | 484 | int __kmem_cache_shrink(struct kmem_cache *); |
41a21285 | 485 | void slab_kmem_cache_release(struct kmem_cache *); |
945cf2b6 | 486 | |
b7454ad3 GC |
487 | struct seq_file; |
488 | struct file; | |
b7454ad3 | 489 | |
0d7561c6 GC |
490 | struct slabinfo { |
491 | unsigned long active_objs; | |
492 | unsigned long num_objs; | |
493 | unsigned long active_slabs; | |
494 | unsigned long num_slabs; | |
495 | unsigned long shared_avail; | |
496 | unsigned int limit; | |
497 | unsigned int batchcount; | |
498 | unsigned int shared; | |
499 | unsigned int objects_per_slab; | |
500 | unsigned int cache_order; | |
501 | }; | |
502 | ||
503 | void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); | |
504 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); | |
b7454ad3 GC |
505 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
506 | size_t count, loff_t *ppos); | |
ba6c496e | 507 | |
e42f174e VB |
508 | #ifdef CONFIG_SLUB_DEBUG |
509 | #ifdef CONFIG_SLUB_DEBUG_ON | |
510 | DECLARE_STATIC_KEY_TRUE(slub_debug_enabled); | |
511 | #else | |
512 | DECLARE_STATIC_KEY_FALSE(slub_debug_enabled); | |
513 | #endif | |
514 | extern void print_tracking(struct kmem_cache *s, void *object); | |
1f9f78b1 | 515 | long validate_slab_cache(struct kmem_cache *s); |
0d4a062a ME |
516 | static inline bool __slub_debug_enabled(void) |
517 | { | |
518 | return static_branch_unlikely(&slub_debug_enabled); | |
519 | } | |
e42f174e VB |
520 | #else |
521 | static inline void print_tracking(struct kmem_cache *s, void *object) | |
522 | { | |
523 | } | |
0d4a062a ME |
524 | static inline bool __slub_debug_enabled(void) |
525 | { | |
526 | return false; | |
527 | } | |
e42f174e VB |
528 | #endif |
529 | ||
530 | /* | |
531 | * Returns true if any of the specified slub_debug flags is enabled for the | |
532 | * cache. Use only for flags parsed by setup_slub_debug() as it also enables | |
533 | * the static key. | |
534 | */ | |
535 | static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) | |
536 | { | |
0d4a062a ME |
537 | if (IS_ENABLED(CONFIG_SLUB_DEBUG)) |
538 | VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); | |
539 | if (__slub_debug_enabled()) | |
e42f174e | 540 | return s->flags & flags; |
e42f174e VB |
541 | return false; |
542 | } | |
543 | ||
84c07d11 | 544 | #ifdef CONFIG_MEMCG_KMEM |
4b5f8d9a VB |
545 | /* |
546 | * slab_objcgs - get the object cgroups vector associated with a slab | |
547 | * @slab: a pointer to the slab struct | |
548 | * | |
549 | * Returns a pointer to the object cgroups vector associated with the slab, | |
550 | * or NULL if no such vector has been associated yet. | |
551 | */ | |
552 | static inline struct obj_cgroup **slab_objcgs(struct slab *slab) | |
553 | { | |
554 | unsigned long memcg_data = READ_ONCE(slab->memcg_data); | |
555 | ||
556 | VM_BUG_ON_PAGE(memcg_data && !(memcg_data & MEMCG_DATA_OBJCGS), | |
557 | slab_page(slab)); | |
558 | VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_KMEM, slab_page(slab)); | |
559 | ||
560 | return (struct obj_cgroup **)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); | |
561 | } | |
562 | ||
563 | int memcg_alloc_slab_cgroups(struct slab *slab, struct kmem_cache *s, | |
564 | gfp_t gfp, bool new_slab); | |
fdbcb2a6 WL |
565 | void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat, |
566 | enum node_stat_item idx, int nr); | |
84c07d11 | 567 | #else /* CONFIG_MEMCG_KMEM */ |
4b5f8d9a VB |
568 | static inline struct obj_cgroup **slab_objcgs(struct slab *slab) |
569 | { | |
570 | return NULL; | |
571 | } | |
572 | ||
4b5f8d9a | 573 | static inline int memcg_alloc_slab_cgroups(struct slab *slab, |
2e9bd483 | 574 | struct kmem_cache *s, gfp_t gfp, |
4b5f8d9a | 575 | bool new_slab) |
286e04b8 RG |
576 | { |
577 | return 0; | |
578 | } | |
84c07d11 | 579 | #endif /* CONFIG_MEMCG_KMEM */ |
b9ce5ef4 | 580 | |
8dfa9d55 HY |
581 | size_t __ksize(const void *objp); |
582 | ||
11c7aec2 JDB |
583 | static inline size_t slab_ksize(const struct kmem_cache *s) |
584 | { | |
a9e0b9f2 | 585 | #ifdef CONFIG_SLUB_DEBUG |
11c7aec2 JDB |
586 | /* |
587 | * Debugging requires use of the padding between object | |
588 | * and whatever may come after it. | |
589 | */ | |
590 | if (s->flags & (SLAB_RED_ZONE | SLAB_POISON)) | |
591 | return s->object_size; | |
a9e0b9f2 | 592 | #endif |
80a9201a AP |
593 | if (s->flags & SLAB_KASAN) |
594 | return s->object_size; | |
11c7aec2 JDB |
595 | /* |
596 | * If we have the need to store the freelist pointer | |
597 | * back there or track user information then we can | |
598 | * only use the space before that information. | |
599 | */ | |
5f0d5a3a | 600 | if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER)) |
11c7aec2 JDB |
601 | return s->inuse; |
602 | /* | |
603 | * Else we can use all the padding etc for the allocation | |
604 | */ | |
605 | return s->size; | |
11c7aec2 JDB |
606 | } |
607 | ||
a9e0b9f2 | 608 | #ifdef CONFIG_SLUB_DEBUG |
852d8be0 YS |
609 | void dump_unreclaimable_slab(void); |
610 | #else | |
611 | static inline void dump_unreclaimable_slab(void) | |
612 | { | |
613 | } | |
614 | #endif | |
615 | ||
55834c59 AP |
616 | void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr); |
617 | ||
7c00fce9 TG |
618 | #ifdef CONFIG_SLAB_FREELIST_RANDOM |
619 | int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count, | |
620 | gfp_t gfp); | |
621 | void cache_random_seq_destroy(struct kmem_cache *cachep); | |
622 | #else | |
623 | static inline int cache_random_seq_create(struct kmem_cache *cachep, | |
624 | unsigned int count, gfp_t gfp) | |
625 | { | |
626 | return 0; | |
627 | } | |
628 | static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } | |
629 | #endif /* CONFIG_SLAB_FREELIST_RANDOM */ | |
630 | ||
6471384a AP |
631 | static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) |
632 | { | |
51cba1eb KC |
633 | if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, |
634 | &init_on_alloc)) { | |
6471384a AP |
635 | if (c->ctor) |
636 | return false; | |
637 | if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) | |
638 | return flags & __GFP_ZERO; | |
639 | return true; | |
640 | } | |
641 | return flags & __GFP_ZERO; | |
642 | } | |
643 | ||
644 | static inline bool slab_want_init_on_free(struct kmem_cache *c) | |
645 | { | |
51cba1eb KC |
646 | if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, |
647 | &init_on_free)) | |
6471384a AP |
648 | return !(c->ctor || |
649 | (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); | |
650 | return false; | |
651 | } | |
652 | ||
64dd6849 FM |
653 | #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG) |
654 | void debugfs_slab_release(struct kmem_cache *); | |
655 | #else | |
656 | static inline void debugfs_slab_release(struct kmem_cache *s) { } | |
657 | #endif | |
658 | ||
5bb1bb35 | 659 | #ifdef CONFIG_PRINTK |
8e7f37f2 PM |
660 | #define KS_ADDRS_COUNT 16 |
661 | struct kmem_obj_info { | |
662 | void *kp_ptr; | |
7213230a | 663 | struct slab *kp_slab; |
8e7f37f2 PM |
664 | void *kp_objp; |
665 | unsigned long kp_data_offset; | |
666 | struct kmem_cache *kp_slab_cache; | |
667 | void *kp_ret; | |
668 | void *kp_stack[KS_ADDRS_COUNT]; | |
e548eaa1 | 669 | void *kp_free_stack[KS_ADDRS_COUNT]; |
8e7f37f2 | 670 | }; |
2dfe63e6 | 671 | void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab); |
5bb1bb35 | 672 | #endif |
8e7f37f2 | 673 | |
0b3eb091 MWO |
674 | void __check_heap_object(const void *ptr, unsigned long n, |
675 | const struct slab *slab, bool to_user); | |
0b3eb091 | 676 | |
946fa0db FT |
677 | #ifdef CONFIG_SLUB_DEBUG |
678 | void skip_orig_size_check(struct kmem_cache *s, const void *object); | |
679 | #endif | |
680 | ||
5240ab40 | 681 | #endif /* MM_SLAB_H */ |