1 /* SPDX-License-Identifier: GPL-2.0 */
5 * Internal slab definitions
8 /* Reuses the bits in struct page */
10 unsigned long __page_flags
;
12 #if defined(CONFIG_SLAB)
15 struct list_head slab_list
;
16 struct rcu_head rcu_head
;
18 struct kmem_cache
*slab_cache
;
19 void *freelist
; /* array of free object indexes */
20 void *s_mem
; /* first object */
23 #elif defined(CONFIG_SLUB)
26 struct list_head slab_list
;
27 struct rcu_head rcu_head
;
28 #ifdef CONFIG_SLUB_CPU_PARTIAL
31 int slabs
; /* Nr of slabs left */
35 struct kmem_cache
*slab_cache
;
36 /* Double-word boundary */
37 void *freelist
; /* first free object */
39 unsigned long counters
;
46 unsigned int __unused
;
48 #elif defined(CONFIG_SLOB)
50 struct list_head slab_list
;
52 void *freelist
; /* first free block */
54 unsigned int __unused_2
;
57 #error "Unexpected slab allocator configured"
60 atomic_t __page_refcount
;
62 unsigned long memcg_data
;
66 #define SLAB_MATCH(pg, sl) \
67 static_assert(offsetof(struct page, pg) == offsetof(struct slab, sl))
68 SLAB_MATCH(flags
, __page_flags
);
69 SLAB_MATCH(compound_head
, slab_list
); /* Ensure bit 0 is clear */
71 SLAB_MATCH(rcu_head
, rcu_head
);
73 SLAB_MATCH(_refcount
, __page_refcount
);
75 SLAB_MATCH(memcg_data
, memcg_data
);
78 static_assert(sizeof(struct slab
) <= sizeof(struct page
));
81 * folio_slab - Converts from folio to slab.
84 * Currently struct slab is a different representation of a folio where
85 * folio_test_slab() is true.
87 * Return: The slab which contains this folio.
89 #define folio_slab(folio) (_Generic((folio), \
90 const struct folio *: (const struct slab *)(folio), \
91 struct folio *: (struct slab *)(folio)))
94 * slab_folio - The folio allocated for a slab
97 * Slabs are allocated as folios that contain the individual objects and are
98 * using some fields in the first struct page of the folio - those fields are
99 * now accessed by struct slab. It is occasionally necessary to convert back to
100 * a folio in order to communicate with the rest of the mm. Please use this
101 * helper function instead of casting yourself, as the implementation may change
104 #define slab_folio(s) (_Generic((s), \
105 const struct slab *: (const struct folio *)s, \
106 struct slab *: (struct folio *)s))
109 * page_slab - Converts from first struct page to slab.
110 * @p: The first (either head of compound or single) page of slab.
112 * A temporary wrapper to convert struct page to struct slab in situations where
113 * we know the page is the compound head, or single order-0 page.
115 * Long-term ideally everything would work with struct slab directly or go
116 * through folio to struct slab.
118 * Return: The slab which contains this page
120 #define page_slab(p) (_Generic((p), \
121 const struct page *: (const struct slab *)(p), \
122 struct page *: (struct slab *)(p)))
125 * slab_page - The first struct page allocated for a slab
128 * A convenience wrapper for converting slab to the first struct page of the
129 * underlying folio, to communicate with code not yet converted to folio or
132 #define slab_page(s) folio_page(slab_folio(s), 0)
135 * If network-based swap is enabled, sl*b must keep track of whether pages
136 * were allocated from pfmemalloc reserves.
138 static inline bool slab_test_pfmemalloc(const struct slab
*slab
)
140 return folio_test_active((struct folio
*)slab_folio(slab
));
143 static inline void slab_set_pfmemalloc(struct slab
*slab
)
145 folio_set_active(slab_folio(slab
));
148 static inline void slab_clear_pfmemalloc(struct slab
*slab
)
150 folio_clear_active(slab_folio(slab
));
153 static inline void __slab_clear_pfmemalloc(struct slab
*slab
)
155 __folio_clear_active(slab_folio(slab
));
158 static inline void *slab_address(const struct slab
*slab
)
160 return folio_address(slab_folio(slab
));
163 static inline int slab_nid(const struct slab
*slab
)
165 return folio_nid(slab_folio(slab
));
168 static inline pg_data_t
*slab_pgdat(const struct slab
*slab
)
170 return folio_pgdat(slab_folio(slab
));
173 static inline struct slab
*virt_to_slab(const void *addr
)
175 struct folio
*folio
= virt_to_folio(addr
);
177 if (!folio_test_slab(folio
))
180 return folio_slab(folio
);
183 static inline int slab_order(const struct slab
*slab
)
185 return folio_order((struct folio
*)slab_folio(slab
));
188 static inline size_t slab_size(const struct slab
*slab
)
190 return PAGE_SIZE
<< slab_order(slab
);
195 * Common fields provided in kmem_cache by all slab allocators
196 * This struct is either used directly by the allocator (SLOB)
197 * or the allocator must include definitions for all fields
198 * provided in kmem_cache_common in their definition of kmem_cache.
200 * Once we can do anonymous structs (C11 standard) we could put a
201 * anonymous struct definition in these allocators so that the
202 * separate allocations in the kmem_cache structure of SLAB and
203 * SLUB is no longer needed.
206 unsigned int object_size
;/* The original size of the object */
207 unsigned int size
; /* The aligned/padded/added on size */
208 unsigned int align
; /* Alignment as calculated */
209 slab_flags_t flags
; /* Active flags on the slab */
210 unsigned int useroffset
;/* Usercopy region offset */
211 unsigned int usersize
; /* Usercopy region size */
212 const char *name
; /* Slab name for sysfs */
213 int refcount
; /* Use counter */
214 void (*ctor
)(void *); /* Called on object slot creation */
215 struct list_head list
; /* List of all slab caches on the system */
218 #endif /* CONFIG_SLOB */
221 #include <linux/slab_def.h>
225 #include <linux/slub_def.h>
228 #include <linux/memcontrol.h>
229 #include <linux/fault-inject.h>
230 #include <linux/kasan.h>
231 #include <linux/kmemleak.h>
232 #include <linux/random.h>
233 #include <linux/sched/mm.h>
234 #include <linux/list_lru.h>
237 * State of the slab allocator.
239 * This is used to describe the states of the allocator during bootup.
240 * Allocators use this to gradually bootstrap themselves. Most allocators
241 * have the problem that the structures used for managing slab caches are
242 * allocated from slab caches themselves.
245 DOWN
, /* No slab functionality yet */
246 PARTIAL
, /* SLUB: kmem_cache_node available */
247 PARTIAL_NODE
, /* SLAB: kmalloc size for node struct available */
248 UP
, /* Slab caches usable but not all extras yet */
249 FULL
/* Everything is working */
252 extern enum slab_state slab_state
;
254 /* The slab cache mutex protects the management structures during changes */
255 extern struct mutex slab_mutex
;
257 /* The list of all slab caches on the system */
258 extern struct list_head slab_caches
;
260 /* The slab cache that manages slab cache information */
261 extern struct kmem_cache
*kmem_cache
;
263 /* A table of kmalloc cache names and sizes */
264 extern const struct kmalloc_info_struct
{
265 const char *name
[NR_KMALLOC_TYPES
];
270 /* Kmalloc array related functions */
271 void setup_kmalloc_cache_index_table(void);
272 void create_kmalloc_caches(slab_flags_t
);
274 /* Find the kmalloc slab corresponding for a certain size */
275 struct kmem_cache
*kmalloc_slab(size_t, gfp_t
);
277 void *__kmem_cache_alloc_node(struct kmem_cache
*s
, gfp_t gfpflags
,
278 int node
, size_t orig_size
,
279 unsigned long caller
);
280 void __kmem_cache_free(struct kmem_cache
*s
, void *x
, unsigned long caller
);
283 gfp_t
kmalloc_fix_flags(gfp_t flags
);
285 /* Functions provided by the slab allocators */
286 int __kmem_cache_create(struct kmem_cache
*, slab_flags_t flags
);
288 struct kmem_cache
*create_kmalloc_cache(const char *name
, unsigned int size
,
289 slab_flags_t flags
, unsigned int useroffset
,
290 unsigned int usersize
);
291 extern void create_boot_cache(struct kmem_cache
*, const char *name
,
292 unsigned int size
, slab_flags_t flags
,
293 unsigned int useroffset
, unsigned int usersize
);
295 int slab_unmergeable(struct kmem_cache
*s
);
296 struct kmem_cache
*find_mergeable(unsigned size
, unsigned align
,
297 slab_flags_t flags
, const char *name
, void (*ctor
)(void *));
300 __kmem_cache_alias(const char *name
, unsigned int size
, unsigned int align
,
301 slab_flags_t flags
, void (*ctor
)(void *));
303 slab_flags_t
kmem_cache_flags(unsigned int object_size
,
304 slab_flags_t flags
, const char *name
);
306 static inline struct kmem_cache
*
307 __kmem_cache_alias(const char *name
, unsigned int size
, unsigned int align
,
308 slab_flags_t flags
, void (*ctor
)(void *))
311 static inline slab_flags_t
kmem_cache_flags(unsigned int object_size
,
312 slab_flags_t flags
, const char *name
)
319 /* Legal flag mask for kmem_cache_create(), for various configurations */
320 #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \
321 SLAB_CACHE_DMA32 | SLAB_PANIC | \
322 SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS )
324 #if defined(CONFIG_DEBUG_SLAB)
325 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
326 #elif defined(CONFIG_SLUB_DEBUG)
327 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
328 SLAB_TRACE | SLAB_CONSISTENCY_CHECKS)
330 #define SLAB_DEBUG_FLAGS (0)
333 #if defined(CONFIG_SLAB)
334 #define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
335 SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \
337 #elif defined(CONFIG_SLUB)
338 #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
339 SLAB_TEMPORARY | SLAB_ACCOUNT | SLAB_NO_USER_FLAGS)
341 #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE)
344 /* Common flags available with current configuration */
345 #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
347 /* Common flags permitted for kmem_cache_create */
348 #define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \
353 SLAB_CONSISTENCY_CHECKS | \
356 SLAB_RECLAIM_ACCOUNT | \
361 bool __kmem_cache_empty(struct kmem_cache
*);
362 int __kmem_cache_shutdown(struct kmem_cache
*);
363 void __kmem_cache_release(struct kmem_cache
*);
364 int __kmem_cache_shrink(struct kmem_cache
*);
365 void slab_kmem_cache_release(struct kmem_cache
*);
371 unsigned long active_objs
;
372 unsigned long num_objs
;
373 unsigned long active_slabs
;
374 unsigned long num_slabs
;
375 unsigned long shared_avail
;
377 unsigned int batchcount
;
379 unsigned int objects_per_slab
;
380 unsigned int cache_order
;
383 void get_slabinfo(struct kmem_cache
*s
, struct slabinfo
*sinfo
);
384 void slabinfo_show_stats(struct seq_file
*m
, struct kmem_cache
*s
);
385 ssize_t
slabinfo_write(struct file
*file
, const char __user
*buffer
,
386 size_t count
, loff_t
*ppos
);
388 static inline enum node_stat_item
cache_vmstat_idx(struct kmem_cache
*s
)
390 return (s
->flags
& SLAB_RECLAIM_ACCOUNT
) ?
391 NR_SLAB_RECLAIMABLE_B
: NR_SLAB_UNRECLAIMABLE_B
;
394 #ifdef CONFIG_SLUB_DEBUG
395 #ifdef CONFIG_SLUB_DEBUG_ON
396 DECLARE_STATIC_KEY_TRUE(slub_debug_enabled
);
398 DECLARE_STATIC_KEY_FALSE(slub_debug_enabled
);
400 extern void print_tracking(struct kmem_cache
*s
, void *object
);
401 long validate_slab_cache(struct kmem_cache
*s
);
402 static inline bool __slub_debug_enabled(void)
404 return static_branch_unlikely(&slub_debug_enabled
);
407 static inline void print_tracking(struct kmem_cache
*s
, void *object
)
410 static inline bool __slub_debug_enabled(void)
417 * Returns true if any of the specified slub_debug flags is enabled for the
418 * cache. Use only for flags parsed by setup_slub_debug() as it also enables
421 static inline bool kmem_cache_debug_flags(struct kmem_cache
*s
, slab_flags_t flags
)
423 if (IS_ENABLED(CONFIG_SLUB_DEBUG
))
424 VM_WARN_ON_ONCE(!(flags
& SLAB_DEBUG_FLAGS
));
425 if (__slub_debug_enabled())
426 return s
->flags
& flags
;
430 #ifdef CONFIG_MEMCG_KMEM
432 * slab_objcgs - get the object cgroups vector associated with a slab
433 * @slab: a pointer to the slab struct
435 * Returns a pointer to the object cgroups vector associated with the slab,
436 * or NULL if no such vector has been associated yet.
438 static inline struct obj_cgroup
**slab_objcgs(struct slab
*slab
)
440 unsigned long memcg_data
= READ_ONCE(slab
->memcg_data
);
442 VM_BUG_ON_PAGE(memcg_data
&& !(memcg_data
& MEMCG_DATA_OBJCGS
),
444 VM_BUG_ON_PAGE(memcg_data
& MEMCG_DATA_KMEM
, slab_page(slab
));
446 return (struct obj_cgroup
**)(memcg_data
& ~MEMCG_DATA_FLAGS_MASK
);
449 int memcg_alloc_slab_cgroups(struct slab
*slab
, struct kmem_cache
*s
,
450 gfp_t gfp
, bool new_slab
);
451 void mod_objcg_state(struct obj_cgroup
*objcg
, struct pglist_data
*pgdat
,
452 enum node_stat_item idx
, int nr
);
454 static inline void memcg_free_slab_cgroups(struct slab
*slab
)
456 kfree(slab_objcgs(slab
));
457 slab
->memcg_data
= 0;
460 static inline size_t obj_full_size(struct kmem_cache
*s
)
463 * For each accounted object there is an extra space which is used
464 * to store obj_cgroup membership. Charge it too.
466 return s
->size
+ sizeof(struct obj_cgroup
*);
470 * Returns false if the allocation should fail.
472 static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache
*s
,
473 struct list_lru
*lru
,
474 struct obj_cgroup
**objcgp
,
475 size_t objects
, gfp_t flags
)
477 struct obj_cgroup
*objcg
;
479 if (!memcg_kmem_enabled())
482 if (!(flags
& __GFP_ACCOUNT
) && !(s
->flags
& SLAB_ACCOUNT
))
485 objcg
= get_obj_cgroup_from_current();
491 struct mem_cgroup
*memcg
;
493 memcg
= get_mem_cgroup_from_objcg(objcg
);
494 ret
= memcg_list_lru_alloc(memcg
, lru
, flags
);
495 css_put(&memcg
->css
);
501 if (obj_cgroup_charge(objcg
, flags
, objects
* obj_full_size(s
)))
507 obj_cgroup_put(objcg
);
511 static inline void memcg_slab_post_alloc_hook(struct kmem_cache
*s
,
512 struct obj_cgroup
*objcg
,
513 gfp_t flags
, size_t size
,
520 if (!memcg_kmem_enabled() || !objcg
)
523 for (i
= 0; i
< size
; i
++) {
525 slab
= virt_to_slab(p
[i
]);
527 if (!slab_objcgs(slab
) &&
528 memcg_alloc_slab_cgroups(slab
, s
, flags
,
530 obj_cgroup_uncharge(objcg
, obj_full_size(s
));
534 off
= obj_to_index(s
, slab
, p
[i
]);
535 obj_cgroup_get(objcg
);
536 slab_objcgs(slab
)[off
] = objcg
;
537 mod_objcg_state(objcg
, slab_pgdat(slab
),
538 cache_vmstat_idx(s
), obj_full_size(s
));
540 obj_cgroup_uncharge(objcg
, obj_full_size(s
));
543 obj_cgroup_put(objcg
);
546 static inline void memcg_slab_free_hook(struct kmem_cache
*s
, struct slab
*slab
,
547 void **p
, int objects
)
549 struct obj_cgroup
**objcgs
;
552 if (!memcg_kmem_enabled())
555 objcgs
= slab_objcgs(slab
);
559 for (i
= 0; i
< objects
; i
++) {
560 struct obj_cgroup
*objcg
;
563 off
= obj_to_index(s
, slab
, p
[i
]);
569 obj_cgroup_uncharge(objcg
, obj_full_size(s
));
570 mod_objcg_state(objcg
, slab_pgdat(slab
), cache_vmstat_idx(s
),
572 obj_cgroup_put(objcg
);
576 #else /* CONFIG_MEMCG_KMEM */
577 static inline struct obj_cgroup
**slab_objcgs(struct slab
*slab
)
582 static inline struct mem_cgroup
*memcg_from_slab_obj(void *ptr
)
587 static inline int memcg_alloc_slab_cgroups(struct slab
*slab
,
588 struct kmem_cache
*s
, gfp_t gfp
,
594 static inline void memcg_free_slab_cgroups(struct slab
*slab
)
598 static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache
*s
,
599 struct list_lru
*lru
,
600 struct obj_cgroup
**objcgp
,
601 size_t objects
, gfp_t flags
)
606 static inline void memcg_slab_post_alloc_hook(struct kmem_cache
*s
,
607 struct obj_cgroup
*objcg
,
608 gfp_t flags
, size_t size
,
613 static inline void memcg_slab_free_hook(struct kmem_cache
*s
, struct slab
*slab
,
614 void **p
, int objects
)
617 #endif /* CONFIG_MEMCG_KMEM */
620 static inline struct kmem_cache
*virt_to_cache(const void *obj
)
624 slab
= virt_to_slab(obj
);
625 if (WARN_ONCE(!slab
, "%s: Object is not a Slab page!\n",
628 return slab
->slab_cache
;
631 static __always_inline
void account_slab(struct slab
*slab
, int order
,
632 struct kmem_cache
*s
, gfp_t gfp
)
634 if (memcg_kmem_enabled() && (s
->flags
& SLAB_ACCOUNT
))
635 memcg_alloc_slab_cgroups(slab
, s
, gfp
, true);
637 mod_node_page_state(slab_pgdat(slab
), cache_vmstat_idx(s
),
641 static __always_inline
void unaccount_slab(struct slab
*slab
, int order
,
642 struct kmem_cache
*s
)
644 if (memcg_kmem_enabled())
645 memcg_free_slab_cgroups(slab
);
647 mod_node_page_state(slab_pgdat(slab
), cache_vmstat_idx(s
),
648 -(PAGE_SIZE
<< order
));
651 static inline struct kmem_cache
*cache_from_obj(struct kmem_cache
*s
, void *x
)
653 struct kmem_cache
*cachep
;
655 if (!IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED
) &&
656 !kmem_cache_debug_flags(s
, SLAB_CONSISTENCY_CHECKS
))
659 cachep
= virt_to_cache(x
);
660 if (WARN(cachep
&& cachep
!= s
,
661 "%s: Wrong slab cache. %s but object is from %s\n",
662 __func__
, s
->name
, cachep
->name
))
663 print_tracking(cachep
, x
);
667 void free_large_kmalloc(struct folio
*folio
, void *object
);
669 #endif /* CONFIG_SLOB */
671 size_t __ksize(const void *objp
);
673 static inline size_t slab_ksize(const struct kmem_cache
*s
)
676 return s
->object_size
;
678 #else /* CONFIG_SLUB */
679 # ifdef CONFIG_SLUB_DEBUG
681 * Debugging requires use of the padding between object
682 * and whatever may come after it.
684 if (s
->flags
& (SLAB_RED_ZONE
| SLAB_POISON
))
685 return s
->object_size
;
687 if (s
->flags
& SLAB_KASAN
)
688 return s
->object_size
;
690 * If we have the need to store the freelist pointer
691 * back there or track user information then we can
692 * only use the space before that information.
694 if (s
->flags
& (SLAB_TYPESAFE_BY_RCU
| SLAB_STORE_USER
))
697 * Else we can use all the padding etc for the allocation
703 static inline struct kmem_cache
*slab_pre_alloc_hook(struct kmem_cache
*s
,
704 struct list_lru
*lru
,
705 struct obj_cgroup
**objcgp
,
706 size_t size
, gfp_t flags
)
708 flags
&= gfp_allowed_mask
;
712 if (should_failslab(s
, flags
))
715 if (!memcg_slab_pre_alloc_hook(s
, lru
, objcgp
, size
, flags
))
721 static inline void slab_post_alloc_hook(struct kmem_cache
*s
,
722 struct obj_cgroup
*objcg
, gfp_t flags
,
723 size_t size
, void **p
, bool init
)
727 flags
&= gfp_allowed_mask
;
730 * As memory initialization might be integrated into KASAN,
731 * kasan_slab_alloc and initialization memset must be
732 * kept together to avoid discrepancies in behavior.
734 * As p[i] might get tagged, memset and kmemleak hook come after KASAN.
736 for (i
= 0; i
< size
; i
++) {
737 p
[i
] = kasan_slab_alloc(s
, p
[i
], flags
, init
);
738 if (p
[i
] && init
&& !kasan_has_integrated_init())
739 memset(p
[i
], 0, s
->object_size
);
740 kmemleak_alloc_recursive(p
[i
], s
->object_size
, 1,
742 kmsan_slab_alloc(s
, p
[i
], flags
);
745 memcg_slab_post_alloc_hook(s
, objcg
, flags
, size
, p
);
750 * The slab lists for all objects.
752 struct kmem_cache_node
{
753 spinlock_t list_lock
;
756 struct list_head slabs_partial
; /* partial list first, better asm code */
757 struct list_head slabs_full
;
758 struct list_head slabs_free
;
759 unsigned long total_slabs
; /* length of all slab lists */
760 unsigned long free_slabs
; /* length of free slab list only */
761 unsigned long free_objects
;
762 unsigned int free_limit
;
763 unsigned int colour_next
; /* Per-node cache coloring */
764 struct array_cache
*shared
; /* shared per node */
765 struct alien_cache
**alien
; /* on other nodes */
766 unsigned long next_reap
; /* updated without locking */
767 int free_touched
; /* updated without locking */
771 unsigned long nr_partial
;
772 struct list_head partial
;
773 #ifdef CONFIG_SLUB_DEBUG
774 atomic_long_t nr_slabs
;
775 atomic_long_t total_objects
;
776 struct list_head full
;
782 static inline struct kmem_cache_node
*get_node(struct kmem_cache
*s
, int node
)
784 return s
->node
[node
];
788 * Iterator over all nodes. The body will be executed for each node that has
789 * a kmem_cache_node structure allocated (which is true for all online nodes)
791 #define for_each_kmem_cache_node(__s, __node, __n) \
792 for (__node = 0; __node < nr_node_ids; __node++) \
793 if ((__n = get_node(__s, __node)))
797 #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG)
798 void dump_unreclaimable_slab(void);
800 static inline void dump_unreclaimable_slab(void)
805 void ___cache_free(struct kmem_cache
*cache
, void *x
, unsigned long addr
);
807 #ifdef CONFIG_SLAB_FREELIST_RANDOM
808 int cache_random_seq_create(struct kmem_cache
*cachep
, unsigned int count
,
810 void cache_random_seq_destroy(struct kmem_cache
*cachep
);
812 static inline int cache_random_seq_create(struct kmem_cache
*cachep
,
813 unsigned int count
, gfp_t gfp
)
817 static inline void cache_random_seq_destroy(struct kmem_cache
*cachep
) { }
818 #endif /* CONFIG_SLAB_FREELIST_RANDOM */
820 static inline bool slab_want_init_on_alloc(gfp_t flags
, struct kmem_cache
*c
)
822 if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON
,
826 if (c
->flags
& (SLAB_TYPESAFE_BY_RCU
| SLAB_POISON
))
827 return flags
& __GFP_ZERO
;
830 return flags
& __GFP_ZERO
;
833 static inline bool slab_want_init_on_free(struct kmem_cache
*c
)
835 if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON
,
838 (c
->flags
& (SLAB_TYPESAFE_BY_RCU
| SLAB_POISON
)));
842 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG)
843 void debugfs_slab_release(struct kmem_cache
*);
845 static inline void debugfs_slab_release(struct kmem_cache
*s
) { }
849 #define KS_ADDRS_COUNT 16
850 struct kmem_obj_info
{
852 struct slab
*kp_slab
;
854 unsigned long kp_data_offset
;
855 struct kmem_cache
*kp_slab_cache
;
857 void *kp_stack
[KS_ADDRS_COUNT
];
858 void *kp_free_stack
[KS_ADDRS_COUNT
];
860 void __kmem_obj_info(struct kmem_obj_info
*kpp
, void *object
, struct slab
*slab
);
863 #ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR
864 void __check_heap_object(const void *ptr
, unsigned long n
,
865 const struct slab
*slab
, bool to_user
);
868 void __check_heap_object(const void *ptr
, unsigned long n
,
869 const struct slab
*slab
, bool to_user
)
874 #endif /* MM_SLAB_H */