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 #include <linux/slab.h> 15 16 /* 17 * Internal slab definitions 18 */ 19 20 /* slab's alloc_flags definitions */ 21 #define SLAB_ALLOC_DEFAULT 0x00 /* no flags */ 22 #define SLAB_ALLOC_NOLOCK 0x01 /* a kmalloc_nolock() allocation */ 23 #define SLAB_ALLOC_NEW_SLAB 0x02 /* a flag for alloc_slab_obj_exts() */ 24 #define SLAB_ALLOC_NO_RECURSE 0x04 /* prevent kmalloc() recursion */ 25 26 static inline bool alloc_flags_allow_spinning(const unsigned int alloc_flags) 27 { 28 return !(alloc_flags & SLAB_ALLOC_NOLOCK); 29 } 30 31 void *__kmalloc_flags_noprof(DECL_TOKEN_PARAMS(size, token), gfp_t flags, 32 unsigned int alloc_flags, int node) 33 __assume_kmalloc_alignment __alloc_size(1); 34 35 static __always_inline __alloc_size(1) void *_kmalloc_flags_noprof(size_t size, 36 gfp_t flags, unsigned int alloc_flags, int node, kmalloc_token_t token) 37 { 38 return __kmalloc_flags_noprof(PASS_TOKEN_PARAMS(size, token), flags, alloc_flags, node); 39 } 40 #define kmalloc_flags_noprof(...) _kmalloc_flags_noprof(__VA_ARGS__, __kmalloc_token(__VA_ARGS__)) 41 #define kmalloc_flags(...) alloc_hooks(kmalloc_flags_noprof(__VA_ARGS__)) 42 43 #ifdef CONFIG_64BIT 44 # ifdef system_has_cmpxchg128 45 # define system_has_freelist_aba() system_has_cmpxchg128() 46 # define try_cmpxchg_freelist try_cmpxchg128 47 # endif 48 typedef u128 freelist_full_t; 49 #else /* CONFIG_64BIT */ 50 # ifdef system_has_cmpxchg64 51 # define system_has_freelist_aba() system_has_cmpxchg64() 52 # define try_cmpxchg_freelist try_cmpxchg64 53 # endif 54 typedef u64 freelist_full_t; 55 #endif /* CONFIG_64BIT */ 56 57 #if defined(system_has_freelist_aba) && !defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) 58 #undef system_has_freelist_aba 59 #endif 60 61 /* 62 * Freelist pointer and counter to cmpxchg together, avoids the typical ABA 63 * problems with cmpxchg of just a pointer. 64 */ 65 struct freelist_counters { 66 union { 67 struct { 68 void *freelist; 69 union { 70 unsigned long counters; 71 struct { 72 unsigned inuse:16; 73 unsigned objects:15; 74 /* 75 * If slab debugging is enabled then the 76 * frozen bit can be reused to indicate 77 * that the slab was corrupted 78 */ 79 unsigned frozen:1; 80 #ifdef CONFIG_64BIT 81 /* 82 * Some optimizations use free bits in 'counters' field 83 * to save memory. In case ->stride field is not available, 84 * such optimizations are disabled. 85 */ 86 unsigned int stride; 87 #endif 88 }; 89 }; 90 }; 91 #ifdef system_has_freelist_aba 92 freelist_full_t freelist_counters; 93 #endif 94 }; 95 }; 96 97 /* Reuses the bits in struct page */ 98 struct slab { 99 memdesc_flags_t flags; 100 101 struct kmem_cache *slab_cache; 102 union { 103 struct { 104 struct list_head slab_list; 105 /* Double-word boundary */ 106 struct freelist_counters; 107 }; 108 struct rcu_head rcu_head; 109 }; 110 111 unsigned int __page_type; 112 atomic_t __page_refcount; 113 #ifdef CONFIG_SLAB_OBJ_EXT 114 unsigned long obj_exts; 115 #endif 116 }; 117 118 #define SLAB_MATCH(pg, sl) \ 119 static_assert(offsetof(struct page, pg) == offsetof(struct slab, sl)) 120 SLAB_MATCH(flags, flags); 121 SLAB_MATCH(compound_info, slab_cache); /* Ensure bit 0 is clear */ 122 SLAB_MATCH(_refcount, __page_refcount); 123 #ifdef CONFIG_MEMCG 124 SLAB_MATCH(memcg_data, obj_exts); 125 #elif defined(CONFIG_SLAB_OBJ_EXT) 126 SLAB_MATCH(_unused_slab_obj_exts, obj_exts); 127 #endif 128 #undef SLAB_MATCH 129 static_assert(sizeof(struct slab) <= sizeof(struct page)); 130 #if defined(system_has_freelist_aba) 131 static_assert(IS_ALIGNED(offsetof(struct slab, freelist), sizeof(struct freelist_counters))); 132 #endif 133 134 /** 135 * slab_folio - The folio allocated for a slab 136 * @s: The slab. 137 * 138 * Slabs are allocated as folios that contain the individual objects and are 139 * using some fields in the first struct page of the folio - those fields are 140 * now accessed by struct slab. It is occasionally necessary to convert back to 141 * a folio in order to communicate with the rest of the mm. Please use this 142 * helper function instead of casting yourself, as the implementation may change 143 * in the future. 144 */ 145 #define slab_folio(s) (_Generic((s), \ 146 const struct slab *: (const struct folio *)s, \ 147 struct slab *: (struct folio *)s)) 148 149 /** 150 * page_slab - Converts from struct page to its slab. 151 * @page: A page which may or may not belong to a slab. 152 * 153 * Return: The slab which contains this page or NULL if the page does 154 * not belong to a slab. This includes pages returned from large kmalloc. 155 */ 156 static inline struct slab *page_slab(const struct page *page) 157 { 158 page = compound_head(page); 159 if (data_race(page->page_type >> 24) != PGTY_slab) 160 page = NULL; 161 162 return (struct slab *)page; 163 } 164 165 /** 166 * slab_page - The first struct page allocated for a slab 167 * @s: The slab. 168 * 169 * A convenience wrapper for converting slab to the first struct page of the 170 * underlying folio, to communicate with code not yet converted to folio or 171 * struct slab. 172 */ 173 #define slab_page(s) folio_page(slab_folio(s), 0) 174 175 static inline void *slab_address(const struct slab *slab) 176 { 177 return folio_address(slab_folio(slab)); 178 } 179 180 static inline int slab_nid(const struct slab *slab) 181 { 182 return memdesc_nid(slab->flags); 183 } 184 185 static inline pg_data_t *slab_pgdat(const struct slab *slab) 186 { 187 return NODE_DATA(slab_nid(slab)); 188 } 189 190 static inline struct slab *virt_to_slab(const void *addr) 191 { 192 return page_slab(virt_to_page(addr)); 193 } 194 195 static inline int slab_order(const struct slab *slab) 196 { 197 return folio_order(slab_folio(slab)); 198 } 199 200 static inline size_t slab_size(const struct slab *slab) 201 { 202 return PAGE_SIZE << slab_order(slab); 203 } 204 205 /* 206 * Word size structure that can be atomically updated or read and that 207 * contains both the order and the number of objects that a slab of the 208 * given order would contain. 209 */ 210 struct kmem_cache_order_objects { 211 unsigned int x; 212 }; 213 214 struct kmem_cache_per_node_ptrs { 215 struct node_barn *barn; 216 struct kmem_cache_node *node; 217 }; 218 219 /* 220 * Slab cache management. 221 */ 222 struct kmem_cache { 223 struct slub_percpu_sheaves __percpu *cpu_sheaves; 224 /* Used for retrieving partial slabs, etc. */ 225 slab_flags_t flags; 226 unsigned long min_partial; 227 unsigned int size; /* Object size including metadata */ 228 unsigned int object_size; /* Object size without metadata */ 229 struct reciprocal_value reciprocal_size; 230 unsigned int offset; /* Free pointer offset */ 231 unsigned int sheaf_capacity; 232 struct kmem_cache_order_objects oo; 233 234 /* Allocation and freeing of slabs */ 235 struct kmem_cache_order_objects min; 236 gfp_t allocflags; /* gfp flags to use on each alloc */ 237 int refcount; /* Refcount for slab cache destroy */ 238 void (*ctor)(void *object); /* Object constructor */ 239 unsigned int inuse; /* Offset to metadata */ 240 unsigned int align; /* Alignment */ 241 unsigned int red_left_pad; /* Left redzone padding size */ 242 const char *name; /* Name (only for display!) */ 243 struct list_head list; /* List of slab caches */ 244 #ifdef CONFIG_SYSFS 245 struct kobject kobj; /* For sysfs */ 246 #endif 247 #ifdef CONFIG_SLAB_FREELIST_HARDENED 248 unsigned long random; 249 #endif 250 251 #ifdef CONFIG_NUMA 252 /* 253 * Defragmentation by allocating from a remote node. 254 */ 255 unsigned int remote_node_defrag_ratio; 256 #endif 257 258 #ifdef CONFIG_SLAB_FREELIST_RANDOM 259 unsigned int *random_seq; 260 #endif 261 262 #ifdef CONFIG_KASAN_GENERIC 263 struct kasan_cache kasan_info; 264 #endif 265 266 #ifdef CONFIG_HARDENED_USERCOPY 267 unsigned int useroffset; /* Usercopy region offset */ 268 unsigned int usersize; /* Usercopy region size */ 269 #endif 270 271 #ifdef CONFIG_SLUB_STATS 272 struct kmem_cache_stats __percpu *cpu_stats; 273 #endif 274 275 struct kmem_cache_per_node_ptrs per_node[MAX_NUMNODES]; 276 }; 277 278 /* 279 * Every cache has !NULL s->cpu_sheaves but they may point to the 280 * bootstrap_sheaf temporarily during init, or permanently for the boot caches 281 * and caches with debugging enabled, or all caches with CONFIG_SLUB_TINY. This 282 * helper distinguishes whether cache has real non-bootstrap sheaves. 283 */ 284 static inline bool cache_has_sheaves(struct kmem_cache *s) 285 { 286 /* Test CONFIG_SLUB_TINY for code elimination purposes */ 287 return !IS_ENABLED(CONFIG_SLUB_TINY) && s->sheaf_capacity; 288 } 289 290 #if defined(CONFIG_SYSFS) && !defined(CONFIG_SLUB_TINY) 291 #define SLAB_SUPPORTS_SYSFS 1 292 void sysfs_slab_unlink(struct kmem_cache *s); 293 void sysfs_slab_release(struct kmem_cache *s); 294 int sysfs_slab_alias(struct kmem_cache *s, const char *name); 295 #else 296 static inline void sysfs_slab_unlink(struct kmem_cache *s) { } 297 static inline void sysfs_slab_release(struct kmem_cache *s) { } 298 static inline int sysfs_slab_alias(struct kmem_cache *s, const char *name) 299 { return 0; } 300 #endif 301 302 void *fixup_red_left(struct kmem_cache *s, void *p); 303 304 static inline void *nearest_obj(struct kmem_cache *cache, 305 const struct slab *slab, void *x) 306 { 307 void *object = x - (x - slab_address(slab)) % cache->size; 308 void *last_object = slab_address(slab) + 309 (slab->objects - 1) * cache->size; 310 void *result = (unlikely(object > last_object)) ? last_object : object; 311 312 result = fixup_red_left(cache, result); 313 return result; 314 } 315 316 /* Determine object index from a given position */ 317 static inline unsigned int __obj_to_index(const struct kmem_cache *cache, 318 void *addr, const void *obj) 319 { 320 return reciprocal_divide(kasan_reset_tag(obj) - addr, 321 cache->reciprocal_size); 322 } 323 324 static inline unsigned int obj_to_index(const struct kmem_cache *cache, 325 const struct slab *slab, const void *obj) 326 { 327 if (is_kfence_address(obj)) 328 return 0; 329 return __obj_to_index(cache, slab_address(slab), obj); 330 } 331 332 static inline int objs_per_slab(const struct kmem_cache *cache, 333 const struct slab *slab) 334 { 335 return slab->objects; 336 } 337 338 /* 339 * State of the slab allocator. 340 * 341 * This is used to describe the states of the allocator during bootup. 342 * Allocators use this to gradually bootstrap themselves. Most allocators 343 * have the problem that the structures used for managing slab caches are 344 * allocated from slab caches themselves. 345 */ 346 enum slab_state { 347 DOWN, /* No slab functionality yet */ 348 PARTIAL, /* SLUB: kmem_cache_node available */ 349 UP, /* Slab caches usable but not all extras yet */ 350 FULL /* Everything is working */ 351 }; 352 353 extern enum slab_state slab_state; 354 355 /* The slab cache mutex protects the management structures during changes */ 356 extern struct mutex slab_mutex; 357 358 /* The list of all slab caches on the system */ 359 extern struct list_head slab_caches; 360 361 /* The slab cache that manages slab cache information */ 362 extern struct kmem_cache *kmem_cache; 363 364 /* A table of kmalloc cache names and sizes */ 365 extern const struct kmalloc_info_struct { 366 const char *name[NR_KMALLOC_TYPES]; 367 unsigned int size; 368 } kmalloc_info[]; 369 370 /* Kmalloc array related functions */ 371 void setup_kmalloc_cache_index_table(void); 372 void create_kmalloc_caches(void); 373 374 extern u8 kmalloc_size_index[24]; 375 376 static inline unsigned int size_index_elem(unsigned int bytes) 377 { 378 return (bytes - 1) / 8; 379 } 380 381 /* 382 * Find the kmem_cache structure that serves a given size of 383 * allocation 384 * 385 * This assumes size is larger than zero and not larger than 386 * KMALLOC_MAX_CACHE_SIZE and the caller must check that. 387 */ 388 static inline struct kmem_cache * 389 kmalloc_slab(size_t size, kmem_buckets *b, gfp_t flags, kmalloc_token_t token) 390 { 391 unsigned int index; 392 393 if (!b) 394 b = &kmalloc_caches[kmalloc_type(flags, token)]; 395 if (size <= 192) 396 index = kmalloc_size_index[size_index_elem(size)]; 397 else 398 index = fls(size - 1); 399 400 return (*b)[index]; 401 } 402 403 gfp_t kmalloc_fix_flags(gfp_t flags); 404 405 /* Functions provided by the slab allocators */ 406 int do_kmem_cache_create(struct kmem_cache *s, const char *name, 407 unsigned int size, struct kmem_cache_args *args, 408 slab_flags_t flags); 409 410 void __init kmem_cache_init(void); 411 extern void create_boot_cache(struct kmem_cache *, const char *name, 412 unsigned int size, slab_flags_t flags, 413 unsigned int useroffset, unsigned int usersize); 414 415 int slab_unmergeable(struct kmem_cache *s); 416 bool slab_args_unmergeable(struct kmem_cache_args *args, slab_flags_t flags); 417 418 slab_flags_t kmem_cache_flags(slab_flags_t flags, const char *name); 419 420 static inline bool is_kmalloc_cache(struct kmem_cache *s) 421 { 422 return (s->flags & SLAB_KMALLOC); 423 } 424 425 static inline bool is_kmalloc_normal(struct kmem_cache *s) 426 { 427 if (!is_kmalloc_cache(s)) 428 return false; 429 return !(s->flags & (SLAB_CACHE_DMA|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT)); 430 } 431 432 bool __kfree_rcu_sheaf(struct kmem_cache *s, void *obj); 433 void flush_all_rcu_sheaves(void); 434 void flush_rcu_sheaves_on_cache(struct kmem_cache *s); 435 436 #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \ 437 SLAB_CACHE_DMA32 | SLAB_PANIC | \ 438 SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS | \ 439 SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ 440 SLAB_TEMPORARY | SLAB_ACCOUNT | \ 441 SLAB_NO_USER_FLAGS | SLAB_KMALLOC | SLAB_NO_MERGE) 442 443 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ 444 SLAB_TRACE | SLAB_CONSISTENCY_CHECKS) 445 446 #define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS) 447 448 bool __kmem_cache_empty(struct kmem_cache *); 449 int __kmem_cache_shutdown(struct kmem_cache *); 450 void __kmem_cache_release(struct kmem_cache *); 451 int __kmem_cache_shrink(struct kmem_cache *); 452 void slab_kmem_cache_release(struct kmem_cache *); 453 454 struct seq_file; 455 struct file; 456 457 struct slabinfo { 458 unsigned long active_objs; 459 unsigned long num_objs; 460 unsigned long active_slabs; 461 unsigned long num_slabs; 462 unsigned long shared_avail; 463 unsigned int limit; 464 unsigned int batchcount; 465 unsigned int shared; 466 unsigned int objects_per_slab; 467 unsigned int cache_order; 468 }; 469 470 void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); 471 472 #ifdef CONFIG_SLUB_DEBUG 473 #ifdef CONFIG_SLUB_DEBUG_ON 474 DECLARE_STATIC_KEY_TRUE(slub_debug_enabled); 475 #else 476 DECLARE_STATIC_KEY_FALSE(slub_debug_enabled); 477 #endif 478 extern void print_tracking(struct kmem_cache *s, void *object); 479 long validate_slab_cache(struct kmem_cache *s); 480 static inline bool __slub_debug_enabled(void) 481 { 482 return static_branch_unlikely(&slub_debug_enabled); 483 } 484 #else 485 static inline void print_tracking(struct kmem_cache *s, void *object) 486 { 487 } 488 static inline bool __slub_debug_enabled(void) 489 { 490 return false; 491 } 492 #endif 493 494 /* 495 * Returns true if any of the specified slab_debug flags is enabled for the 496 * cache. Use only for flags parsed by setup_slub_debug() as it also enables 497 * the static key. 498 */ 499 static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) 500 { 501 if (IS_ENABLED(CONFIG_SLUB_DEBUG)) 502 VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); 503 if (__slub_debug_enabled()) 504 return s->flags & flags; 505 return false; 506 } 507 508 #if IS_ENABLED(CONFIG_SLUB_DEBUG) && IS_ENABLED(CONFIG_KUNIT) 509 bool slab_in_kunit_test(void); 510 #else 511 static inline bool slab_in_kunit_test(void) { return false; } 512 #endif 513 514 /* 515 * slub is about to manipulate internal object metadata. This memory lies 516 * outside the range of the allocated object, so accessing it would normally 517 * be reported by kasan as a bounds error. metadata_access_enable() is used 518 * to tell kasan that these accesses are OK. 519 */ 520 static inline void metadata_access_enable(void) 521 { 522 kasan_disable_current(); 523 kmsan_disable_current(); 524 } 525 526 static inline void metadata_access_disable(void) 527 { 528 kmsan_enable_current(); 529 kasan_enable_current(); 530 } 531 532 #ifdef CONFIG_SLAB_OBJ_EXT 533 534 /* 535 * slab_obj_exts - get the pointer to the slab object extension vector 536 * associated with a slab. 537 * @slab: a pointer to the slab struct 538 * 539 * Returns the address of the object extension vector associated with the slab, 540 * or zero if no such vector has been associated yet. 541 * Do not dereference the return value directly; use get/put_slab_obj_exts() 542 * pair and slab_obj_ext() to access individual elements. 543 * 544 * Example usage: 545 * 546 * obj_exts = slab_obj_exts(slab); 547 * if (obj_exts) { 548 * get_slab_obj_exts(obj_exts); 549 * obj_ext = slab_obj_ext(slab, obj_exts, obj_to_index(s, slab, obj)); 550 * // do something with obj_ext 551 * put_slab_obj_exts(obj_exts); 552 * } 553 * 554 * Note that the get/put semantics does not involve reference counting. 555 * Instead, it updates kasan/kmsan depth so that accesses to slabobj_ext 556 * won't be reported as access violations. 557 */ 558 static inline unsigned long slab_obj_exts(struct slab *slab) 559 { 560 unsigned long obj_exts = READ_ONCE(slab->obj_exts); 561 562 #ifdef CONFIG_MEMCG 563 /* 564 * obj_exts should be either NULL, a valid pointer with 565 * MEMCG_DATA_OBJEXTS bit set or be equal to OBJEXTS_ALLOC_FAIL. 566 */ 567 VM_BUG_ON_PAGE(obj_exts && !(obj_exts & MEMCG_DATA_OBJEXTS) && 568 obj_exts != OBJEXTS_ALLOC_FAIL, slab_page(slab)); 569 VM_BUG_ON_PAGE(obj_exts & MEMCG_DATA_KMEM, slab_page(slab)); 570 #endif 571 572 return obj_exts & ~OBJEXTS_FLAGS_MASK; 573 } 574 575 static inline void get_slab_obj_exts(unsigned long obj_exts) 576 { 577 VM_WARN_ON_ONCE(!obj_exts); 578 metadata_access_enable(); 579 } 580 581 static inline void put_slab_obj_exts(unsigned long obj_exts) 582 { 583 metadata_access_disable(); 584 } 585 586 #ifdef CONFIG_64BIT 587 static inline void slab_set_stride(struct slab *slab, unsigned int stride) 588 { 589 slab->stride = stride; 590 } 591 static inline unsigned int slab_get_stride(struct slab *slab) 592 { 593 return slab->stride; 594 } 595 #else 596 static inline void slab_set_stride(struct slab *slab, unsigned int stride) 597 { 598 VM_WARN_ON_ONCE(stride != sizeof(struct slabobj_ext)); 599 } 600 static inline unsigned int slab_get_stride(struct slab *slab) 601 { 602 return sizeof(struct slabobj_ext); 603 } 604 #endif 605 606 /* 607 * slab_obj_ext - get the pointer to the slab object extension metadata 608 * associated with an object in a slab. 609 * @slab: a pointer to the slab struct 610 * @obj_exts: a pointer to the object extension vector 611 * @index: an index of the object 612 * 613 * Returns a pointer to the object extension associated with the object. 614 * Must be called within a section covered by get/put_slab_obj_exts(). 615 */ 616 static inline struct slabobj_ext *slab_obj_ext(struct slab *slab, 617 unsigned long obj_exts, 618 unsigned int index) 619 { 620 struct slabobj_ext *obj_ext; 621 622 VM_WARN_ON_ONCE(obj_exts != slab_obj_exts(slab)); 623 624 obj_ext = (struct slabobj_ext *)(obj_exts + 625 slab_get_stride(slab) * index); 626 return kasan_reset_tag(obj_ext); 627 } 628 629 int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s, 630 gfp_t gfp, unsigned int alloc_flags); 631 632 #else /* CONFIG_SLAB_OBJ_EXT */ 633 634 static inline unsigned long slab_obj_exts(struct slab *slab) 635 { 636 return 0; 637 } 638 639 static inline struct slabobj_ext *slab_obj_ext(struct slab *slab, 640 unsigned long obj_exts, 641 unsigned int index) 642 { 643 return NULL; 644 } 645 646 static inline void slab_set_stride(struct slab *slab, unsigned int stride) { } 647 static inline unsigned int slab_get_stride(struct slab *slab) { return 0; } 648 649 650 #endif /* CONFIG_SLAB_OBJ_EXT */ 651 652 static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s) 653 { 654 return (s->flags & SLAB_RECLAIM_ACCOUNT) ? 655 NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B; 656 } 657 658 #ifdef CONFIG_MEMCG 659 bool __memcg_slab_post_alloc_hook(struct kmem_cache *s, struct list_lru *lru, 660 gfp_t flags, unsigned int slab_alloc_flags, 661 size_t size, void **p); 662 void __memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab, 663 void **p, int objects, unsigned long obj_exts); 664 #endif 665 666 void kvfree_rcu_cb(struct rcu_head *head); 667 668 static inline unsigned int large_kmalloc_order(const struct page *page) 669 { 670 return page[1].flags.f & 0xff; 671 } 672 673 static inline size_t large_kmalloc_size(const struct page *page) 674 { 675 return PAGE_SIZE << large_kmalloc_order(page); 676 } 677 678 #ifdef CONFIG_SLUB_DEBUG 679 void dump_unreclaimable_slab(void); 680 #else 681 static inline void dump_unreclaimable_slab(void) 682 { 683 } 684 #endif 685 686 void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr); 687 688 #ifdef CONFIG_SLAB_FREELIST_RANDOM 689 int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count, 690 gfp_t gfp); 691 void cache_random_seq_destroy(struct kmem_cache *cachep); 692 #else 693 static inline int cache_random_seq_create(struct kmem_cache *cachep, 694 unsigned int count, gfp_t gfp) 695 { 696 return 0; 697 } 698 static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } 699 #endif /* CONFIG_SLAB_FREELIST_RANDOM */ 700 701 static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) 702 { 703 if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, 704 &init_on_alloc)) { 705 if (c->ctor) 706 return false; 707 if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) 708 return flags & __GFP_ZERO; 709 return true; 710 } 711 return flags & __GFP_ZERO; 712 } 713 714 static inline bool slab_want_init_on_free(struct kmem_cache *c) 715 { 716 if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, 717 &init_on_free)) 718 return !(c->ctor || 719 (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); 720 return false; 721 } 722 723 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG) 724 void debugfs_slab_release(struct kmem_cache *); 725 #else 726 static inline void debugfs_slab_release(struct kmem_cache *s) { } 727 #endif 728 729 #ifdef CONFIG_PRINTK 730 #define KS_ADDRS_COUNT 16 731 struct kmem_obj_info { 732 void *kp_ptr; 733 struct slab *kp_slab; 734 void *kp_objp; 735 unsigned long kp_data_offset; 736 struct kmem_cache *kp_slab_cache; 737 void *kp_ret; 738 void *kp_stack[KS_ADDRS_COUNT]; 739 void *kp_free_stack[KS_ADDRS_COUNT]; 740 }; 741 void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab); 742 #endif 743 744 void __check_heap_object(const void *ptr, unsigned long n, 745 const struct slab *slab, bool to_user); 746 747 void defer_free_barrier(void); 748 749 static inline bool slub_debug_orig_size(struct kmem_cache *s) 750 { 751 return (kmem_cache_debug_flags(s, SLAB_STORE_USER) && 752 (s->flags & SLAB_KMALLOC)); 753 } 754 755 #ifdef CONFIG_SLUB_DEBUG 756 void skip_orig_size_check(struct kmem_cache *s, const void *object); 757 #endif 758 759 #endif /* MM_SLAB_H */ 760