1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef MM_SLAB_H 3 #define MM_SLAB_H 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> 12 #include <linux/kfence.h> 13 #include <linux/kasan.h> 14 15 /* 16 * Internal slab definitions 17 */ 18 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 51 /* Reuses the bits in struct page */ 52 struct slab { 53 memdesc_flags_t flags; 54 55 struct kmem_cache *slab_cache; 56 union { 57 struct { 58 union { 59 struct list_head slab_list; 60 struct { /* For deferred deactivate_slab() */ 61 struct llist_node llnode; 62 void *flush_freelist; 63 }; 64 #ifdef CONFIG_SLUB_CPU_PARTIAL 65 struct { 66 struct slab *next; 67 int slabs; /* Nr of slabs left */ 68 }; 69 #endif 70 }; 71 /* Double-word boundary */ 72 union { 73 struct { 74 void *freelist; /* first free object */ 75 union { 76 unsigned long counters; 77 struct { 78 unsigned inuse:16; 79 unsigned objects:15; 80 /* 81 * If slab debugging is enabled then the 82 * frozen bit can be reused to indicate 83 * that the slab was corrupted 84 */ 85 unsigned frozen:1; 86 }; 87 }; 88 }; 89 #ifdef system_has_freelist_aba 90 freelist_aba_t freelist_counter; 91 #endif 92 }; 93 }; 94 struct rcu_head rcu_head; 95 }; 96 97 unsigned int __page_type; 98 atomic_t __page_refcount; 99 #ifdef CONFIG_SLAB_OBJ_EXT 100 unsigned long obj_exts; 101 #endif 102 }; 103 104 #define SLAB_MATCH(pg, sl) \ 105 static_assert(offsetof(struct page, pg) == offsetof(struct slab, sl)) 106 SLAB_MATCH(flags, flags); 107 SLAB_MATCH(compound_head, slab_cache); /* Ensure bit 0 is clear */ 108 SLAB_MATCH(_refcount, __page_refcount); 109 #ifdef CONFIG_MEMCG 110 SLAB_MATCH(memcg_data, obj_exts); 111 #elif defined(CONFIG_SLAB_OBJ_EXT) 112 SLAB_MATCH(_unused_slab_obj_exts, obj_exts); 113 #endif 114 #undef SLAB_MATCH 115 static_assert(sizeof(struct slab) <= sizeof(struct page)); 116 #if defined(system_has_freelist_aba) 117 static_assert(IS_ALIGNED(offsetof(struct slab, freelist), sizeof(freelist_aba_t))); 118 #endif 119 120 /** 121 * folio_slab - Converts from folio to slab. 122 * @folio: The folio. 123 * 124 * Currently struct slab is a different representation of a folio where 125 * folio_test_slab() is true. 126 * 127 * Return: The slab which contains this folio. 128 */ 129 #define folio_slab(folio) (_Generic((folio), \ 130 const struct folio *: (const struct slab *)(folio), \ 131 struct folio *: (struct slab *)(folio))) 132 133 /** 134 * slab_folio - The folio allocated for a slab 135 * @s: The slab. 136 * 137 * Slabs are allocated as folios that contain the individual objects and are 138 * using some fields in the first struct page of the folio - those fields are 139 * now accessed by struct slab. It is occasionally necessary to convert back to 140 * a folio in order to communicate with the rest of the mm. Please use this 141 * helper function instead of casting yourself, as the implementation may change 142 * in the future. 143 */ 144 #define slab_folio(s) (_Generic((s), \ 145 const struct slab *: (const struct folio *)s, \ 146 struct slab *: (struct folio *)s)) 147 148 /** 149 * page_slab - Converts from first struct page to slab. 150 * @p: The first (either head of compound or single) page of slab. 151 * 152 * A temporary wrapper to convert struct page to struct slab in situations where 153 * we know the page is the compound head, or single order-0 page. 154 * 155 * Long-term ideally everything would work with struct slab directly or go 156 * through folio to struct slab. 157 * 158 * Return: The slab which contains this page 159 */ 160 #define page_slab(p) (_Generic((p), \ 161 const struct page *: (const struct slab *)(p), \ 162 struct page *: (struct slab *)(p))) 163 164 /** 165 * slab_page - The first struct page allocated for a slab 166 * @s: The slab. 167 * 168 * A convenience wrapper for converting slab to the first struct page of the 169 * underlying folio, to communicate with code not yet converted to folio or 170 * struct slab. 171 */ 172 #define slab_page(s) folio_page(slab_folio(s), 0) 173 174 static inline void *slab_address(const struct slab *slab) 175 { 176 return folio_address(slab_folio(slab)); 177 } 178 179 static inline int slab_nid(const struct slab *slab) 180 { 181 return memdesc_nid(slab->flags); 182 } 183 184 static inline pg_data_t *slab_pgdat(const struct slab *slab) 185 { 186 return NODE_DATA(slab_nid(slab)); 187 } 188 189 static inline struct slab *virt_to_slab(const void *addr) 190 { 191 struct folio *folio = virt_to_folio(addr); 192 193 if (!folio_test_slab(folio)) 194 return NULL; 195 196 return folio_slab(folio); 197 } 198 199 static inline int slab_order(const struct slab *slab) 200 { 201 return folio_order(slab_folio(slab)); 202 } 203 204 static inline size_t slab_size(const struct slab *slab) 205 { 206 return PAGE_SIZE << slab_order(slab); 207 } 208 209 #ifdef CONFIG_SLUB_CPU_PARTIAL 210 #define slub_percpu_partial(c) ((c)->partial) 211 212 #define slub_set_percpu_partial(c, p) \ 213 ({ \ 214 slub_percpu_partial(c) = (p)->next; \ 215 }) 216 217 #define slub_percpu_partial_read_once(c) READ_ONCE(slub_percpu_partial(c)) 218 #else 219 #define slub_percpu_partial(c) NULL 220 221 #define slub_set_percpu_partial(c, p) 222 223 #define slub_percpu_partial_read_once(c) NULL 224 #endif // CONFIG_SLUB_CPU_PARTIAL 225 226 /* 227 * Word size structure that can be atomically updated or read and that 228 * contains both the order and the number of objects that a slab of the 229 * given order would contain. 230 */ 231 struct kmem_cache_order_objects { 232 unsigned int x; 233 }; 234 235 /* 236 * Slab cache management. 237 */ 238 struct kmem_cache { 239 #ifndef CONFIG_SLUB_TINY 240 struct kmem_cache_cpu __percpu *cpu_slab; 241 struct lock_class_key lock_key; 242 #endif 243 struct slub_percpu_sheaves __percpu *cpu_sheaves; 244 /* Used for retrieving partial slabs, etc. */ 245 slab_flags_t flags; 246 unsigned long min_partial; 247 unsigned int size; /* Object size including metadata */ 248 unsigned int object_size; /* Object size without metadata */ 249 struct reciprocal_value reciprocal_size; 250 unsigned int offset; /* Free pointer offset */ 251 #ifdef CONFIG_SLUB_CPU_PARTIAL 252 /* Number of per cpu partial objects to keep around */ 253 unsigned int cpu_partial; 254 /* Number of per cpu partial slabs to keep around */ 255 unsigned int cpu_partial_slabs; 256 #endif 257 unsigned int sheaf_capacity; 258 struct kmem_cache_order_objects oo; 259 260 /* Allocation and freeing of slabs */ 261 struct kmem_cache_order_objects min; 262 gfp_t allocflags; /* gfp flags to use on each alloc */ 263 int refcount; /* Refcount for slab cache destroy */ 264 void (*ctor)(void *object); /* Object constructor */ 265 unsigned int inuse; /* Offset to metadata */ 266 unsigned int align; /* Alignment */ 267 unsigned int red_left_pad; /* Left redzone padding size */ 268 const char *name; /* Name (only for display!) */ 269 struct list_head list; /* List of slab caches */ 270 #ifdef CONFIG_SYSFS 271 struct kobject kobj; /* For sysfs */ 272 #endif 273 #ifdef CONFIG_SLAB_FREELIST_HARDENED 274 unsigned long random; 275 #endif 276 277 #ifdef CONFIG_NUMA 278 /* 279 * Defragmentation by allocating from a remote node. 280 */ 281 unsigned int remote_node_defrag_ratio; 282 #endif 283 284 #ifdef CONFIG_SLAB_FREELIST_RANDOM 285 unsigned int *random_seq; 286 #endif 287 288 #ifdef CONFIG_KASAN_GENERIC 289 struct kasan_cache kasan_info; 290 #endif 291 292 #ifdef CONFIG_HARDENED_USERCOPY 293 unsigned int useroffset; /* Usercopy region offset */ 294 unsigned int usersize; /* Usercopy region size */ 295 #endif 296 297 struct kmem_cache_node *node[MAX_NUMNODES]; 298 }; 299 300 #if defined(CONFIG_SYSFS) && !defined(CONFIG_SLUB_TINY) 301 #define SLAB_SUPPORTS_SYSFS 1 302 void sysfs_slab_unlink(struct kmem_cache *s); 303 void sysfs_slab_release(struct kmem_cache *s); 304 #else 305 static inline void sysfs_slab_unlink(struct kmem_cache *s) { } 306 static inline void sysfs_slab_release(struct kmem_cache *s) { } 307 #endif 308 309 void *fixup_red_left(struct kmem_cache *s, void *p); 310 311 static inline void *nearest_obj(struct kmem_cache *cache, 312 const struct slab *slab, void *x) 313 { 314 void *object = x - (x - slab_address(slab)) % cache->size; 315 void *last_object = slab_address(slab) + 316 (slab->objects - 1) * cache->size; 317 void *result = (unlikely(object > last_object)) ? last_object : object; 318 319 result = fixup_red_left(cache, result); 320 return result; 321 } 322 323 /* Determine object index from a given position */ 324 static inline unsigned int __obj_to_index(const struct kmem_cache *cache, 325 void *addr, void *obj) 326 { 327 return reciprocal_divide(kasan_reset_tag(obj) - addr, 328 cache->reciprocal_size); 329 } 330 331 static inline unsigned int obj_to_index(const struct kmem_cache *cache, 332 const struct slab *slab, void *obj) 333 { 334 if (is_kfence_address(obj)) 335 return 0; 336 return __obj_to_index(cache, slab_address(slab), obj); 337 } 338 339 static inline int objs_per_slab(const struct kmem_cache *cache, 340 const struct slab *slab) 341 { 342 return slab->objects; 343 } 344 345 /* 346 * State of the slab allocator. 347 * 348 * This is used to describe the states of the allocator during bootup. 349 * Allocators use this to gradually bootstrap themselves. Most allocators 350 * have the problem that the structures used for managing slab caches are 351 * allocated from slab caches themselves. 352 */ 353 enum slab_state { 354 DOWN, /* No slab functionality yet */ 355 PARTIAL, /* SLUB: kmem_cache_node available */ 356 UP, /* Slab caches usable but not all extras yet */ 357 FULL /* Everything is working */ 358 }; 359 360 extern enum slab_state slab_state; 361 362 /* The slab cache mutex protects the management structures during changes */ 363 extern struct mutex slab_mutex; 364 365 /* The list of all slab caches on the system */ 366 extern struct list_head slab_caches; 367 368 /* The slab cache that manages slab cache information */ 369 extern struct kmem_cache *kmem_cache; 370 371 /* A table of kmalloc cache names and sizes */ 372 extern const struct kmalloc_info_struct { 373 const char *name[NR_KMALLOC_TYPES]; 374 unsigned int size; 375 } kmalloc_info[]; 376 377 /* Kmalloc array related functions */ 378 void setup_kmalloc_cache_index_table(void); 379 void create_kmalloc_caches(void); 380 381 extern u8 kmalloc_size_index[24]; 382 383 static inline unsigned int size_index_elem(unsigned int bytes) 384 { 385 return (bytes - 1) / 8; 386 } 387 388 /* 389 * Find the kmem_cache structure that serves a given size of 390 * allocation 391 * 392 * This assumes size is larger than zero and not larger than 393 * KMALLOC_MAX_CACHE_SIZE and the caller must check that. 394 */ 395 static inline struct kmem_cache * 396 kmalloc_slab(size_t size, kmem_buckets *b, gfp_t flags, unsigned long caller) 397 { 398 unsigned int index; 399 400 if (!b) 401 b = &kmalloc_caches[kmalloc_type(flags, caller)]; 402 if (size <= 192) 403 index = kmalloc_size_index[size_index_elem(size)]; 404 else 405 index = fls(size - 1); 406 407 return (*b)[index]; 408 } 409 410 gfp_t kmalloc_fix_flags(gfp_t flags); 411 412 /* Functions provided by the slab allocators */ 413 int do_kmem_cache_create(struct kmem_cache *s, const char *name, 414 unsigned int size, struct kmem_cache_args *args, 415 slab_flags_t flags); 416 417 void __init kmem_cache_init(void); 418 extern void create_boot_cache(struct kmem_cache *, const char *name, 419 unsigned int size, slab_flags_t flags, 420 unsigned int useroffset, unsigned int usersize); 421 422 int slab_unmergeable(struct kmem_cache *s); 423 struct kmem_cache *find_mergeable(unsigned size, unsigned align, 424 slab_flags_t flags, const char *name, void (*ctor)(void *)); 425 struct kmem_cache * 426 __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, 427 slab_flags_t flags, void (*ctor)(void *)); 428 429 slab_flags_t kmem_cache_flags(slab_flags_t flags, const char *name); 430 431 static inline bool is_kmalloc_cache(struct kmem_cache *s) 432 { 433 return (s->flags & SLAB_KMALLOC); 434 } 435 436 static inline bool is_kmalloc_normal(struct kmem_cache *s) 437 { 438 if (!is_kmalloc_cache(s)) 439 return false; 440 return !(s->flags & (SLAB_CACHE_DMA|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT)); 441 } 442 443 bool __kfree_rcu_sheaf(struct kmem_cache *s, void *obj); 444 void flush_all_rcu_sheaves(void); 445 446 #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \ 447 SLAB_CACHE_DMA32 | SLAB_PANIC | \ 448 SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS | \ 449 SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ 450 SLAB_TEMPORARY | SLAB_ACCOUNT | \ 451 SLAB_NO_USER_FLAGS | SLAB_KMALLOC | SLAB_NO_MERGE) 452 453 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ 454 SLAB_TRACE | SLAB_CONSISTENCY_CHECKS) 455 456 #define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS) 457 458 bool __kmem_cache_empty(struct kmem_cache *); 459 int __kmem_cache_shutdown(struct kmem_cache *); 460 void __kmem_cache_release(struct kmem_cache *); 461 int __kmem_cache_shrink(struct kmem_cache *); 462 void slab_kmem_cache_release(struct kmem_cache *); 463 464 struct seq_file; 465 struct file; 466 467 struct slabinfo { 468 unsigned long active_objs; 469 unsigned long num_objs; 470 unsigned long active_slabs; 471 unsigned long num_slabs; 472 unsigned long shared_avail; 473 unsigned int limit; 474 unsigned int batchcount; 475 unsigned int shared; 476 unsigned int objects_per_slab; 477 unsigned int cache_order; 478 }; 479 480 void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); 481 482 #ifdef CONFIG_SLUB_DEBUG 483 #ifdef CONFIG_SLUB_DEBUG_ON 484 DECLARE_STATIC_KEY_TRUE(slub_debug_enabled); 485 #else 486 DECLARE_STATIC_KEY_FALSE(slub_debug_enabled); 487 #endif 488 extern void print_tracking(struct kmem_cache *s, void *object); 489 long validate_slab_cache(struct kmem_cache *s); 490 static inline bool __slub_debug_enabled(void) 491 { 492 return static_branch_unlikely(&slub_debug_enabled); 493 } 494 #else 495 static inline void print_tracking(struct kmem_cache *s, void *object) 496 { 497 } 498 static inline bool __slub_debug_enabled(void) 499 { 500 return false; 501 } 502 #endif 503 504 /* 505 * Returns true if any of the specified slab_debug flags is enabled for the 506 * cache. Use only for flags parsed by setup_slub_debug() as it also enables 507 * the static key. 508 */ 509 static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) 510 { 511 if (IS_ENABLED(CONFIG_SLUB_DEBUG)) 512 VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); 513 if (__slub_debug_enabled()) 514 return s->flags & flags; 515 return false; 516 } 517 518 #if IS_ENABLED(CONFIG_SLUB_DEBUG) && IS_ENABLED(CONFIG_KUNIT) 519 bool slab_in_kunit_test(void); 520 #else 521 static inline bool slab_in_kunit_test(void) { return false; } 522 #endif 523 524 #ifdef CONFIG_SLAB_OBJ_EXT 525 526 /* 527 * slab_obj_exts - get the pointer to the slab object extension vector 528 * associated with a slab. 529 * @slab: a pointer to the slab struct 530 * 531 * Returns a pointer to the object extension vector associated with the slab, 532 * or NULL if no such vector has been associated yet. 533 */ 534 static inline struct slabobj_ext *slab_obj_exts(struct slab *slab) 535 { 536 unsigned long obj_exts = READ_ONCE(slab->obj_exts); 537 538 #ifdef CONFIG_MEMCG 539 /* 540 * obj_exts should be either NULL, a valid pointer with 541 * MEMCG_DATA_OBJEXTS bit set or be equal to OBJEXTS_ALLOC_FAIL. 542 */ 543 VM_BUG_ON_PAGE(obj_exts && !(obj_exts & MEMCG_DATA_OBJEXTS) && 544 obj_exts != OBJEXTS_ALLOC_FAIL, slab_page(slab)); 545 VM_BUG_ON_PAGE(obj_exts & MEMCG_DATA_KMEM, slab_page(slab)); 546 #endif 547 return (struct slabobj_ext *)(obj_exts & ~OBJEXTS_FLAGS_MASK); 548 } 549 550 int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s, 551 gfp_t gfp, bool new_slab); 552 553 #else /* CONFIG_SLAB_OBJ_EXT */ 554 555 static inline struct slabobj_ext *slab_obj_exts(struct slab *slab) 556 { 557 return NULL; 558 } 559 560 #endif /* CONFIG_SLAB_OBJ_EXT */ 561 562 static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s) 563 { 564 return (s->flags & SLAB_RECLAIM_ACCOUNT) ? 565 NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B; 566 } 567 568 #ifdef CONFIG_MEMCG 569 bool __memcg_slab_post_alloc_hook(struct kmem_cache *s, struct list_lru *lru, 570 gfp_t flags, size_t size, void **p); 571 void __memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab, 572 void **p, int objects, struct slabobj_ext *obj_exts); 573 #endif 574 575 void kvfree_rcu_cb(struct rcu_head *head); 576 577 size_t __ksize(const void *objp); 578 579 static inline size_t slab_ksize(const struct kmem_cache *s) 580 { 581 #ifdef CONFIG_SLUB_DEBUG 582 /* 583 * Debugging requires use of the padding between object 584 * and whatever may come after it. 585 */ 586 if (s->flags & (SLAB_RED_ZONE | SLAB_POISON)) 587 return s->object_size; 588 #endif 589 if (s->flags & SLAB_KASAN) 590 return s->object_size; 591 /* 592 * If we have the need to store the freelist pointer 593 * back there or track user information then we can 594 * only use the space before that information. 595 */ 596 if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER)) 597 return s->inuse; 598 /* 599 * Else we can use all the padding etc for the allocation 600 */ 601 return s->size; 602 } 603 604 #ifdef CONFIG_SLUB_DEBUG 605 void dump_unreclaimable_slab(void); 606 #else 607 static inline void dump_unreclaimable_slab(void) 608 { 609 } 610 #endif 611 612 void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr); 613 614 #ifdef CONFIG_SLAB_FREELIST_RANDOM 615 int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count, 616 gfp_t gfp); 617 void cache_random_seq_destroy(struct kmem_cache *cachep); 618 #else 619 static inline int cache_random_seq_create(struct kmem_cache *cachep, 620 unsigned int count, gfp_t gfp) 621 { 622 return 0; 623 } 624 static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } 625 #endif /* CONFIG_SLAB_FREELIST_RANDOM */ 626 627 static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) 628 { 629 if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, 630 &init_on_alloc)) { 631 if (c->ctor) 632 return false; 633 if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) 634 return flags & __GFP_ZERO; 635 return true; 636 } 637 return flags & __GFP_ZERO; 638 } 639 640 static inline bool slab_want_init_on_free(struct kmem_cache *c) 641 { 642 if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, 643 &init_on_free)) 644 return !(c->ctor || 645 (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); 646 return false; 647 } 648 649 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG) 650 void debugfs_slab_release(struct kmem_cache *); 651 #else 652 static inline void debugfs_slab_release(struct kmem_cache *s) { } 653 #endif 654 655 #ifdef CONFIG_PRINTK 656 #define KS_ADDRS_COUNT 16 657 struct kmem_obj_info { 658 void *kp_ptr; 659 struct slab *kp_slab; 660 void *kp_objp; 661 unsigned long kp_data_offset; 662 struct kmem_cache *kp_slab_cache; 663 void *kp_ret; 664 void *kp_stack[KS_ADDRS_COUNT]; 665 void *kp_free_stack[KS_ADDRS_COUNT]; 666 }; 667 void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab); 668 #endif 669 670 void __check_heap_object(const void *ptr, unsigned long n, 671 const struct slab *slab, bool to_user); 672 673 void defer_free_barrier(void); 674 675 static inline bool slub_debug_orig_size(struct kmem_cache *s) 676 { 677 return (kmem_cache_debug_flags(s, SLAB_STORE_USER) && 678 (s->flags & SLAB_KMALLOC)); 679 } 680 681 #ifdef CONFIG_SLUB_DEBUG 682 void skip_orig_size_check(struct kmem_cache *s, const void *object); 683 #endif 684 685 #endif /* MM_SLAB_H */ 686