2 * linux/include/linux/slab.h
3 * Written by Mark Hemment, 1996.
4 * (markhe@nextd.demon.co.uk)
10 #if defined(__KERNEL__)
12 /* kmem_cache_t exists for legacy reasons and is not used by code in mm */
13 typedef struct kmem_cache kmem_cache_t;
15 #include <linux/gfp.h>
16 #include <linux/init.h>
17 #include <linux/types.h>
18 #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
19 #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
21 /* flags for kmem_cache_alloc() */
22 #define SLAB_KERNEL GFP_KERNEL
23 #define SLAB_DMA GFP_DMA
25 /* flags to pass to kmem_cache_create().
26 * The first 3 are only valid when the allocator as been build
29 #define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
30 #define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
31 #define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
32 #define SLAB_POISON 0x00000800UL /* Poison objects */
33 #define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
34 #define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
35 #define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
36 #define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
37 #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
38 what is reclaimable later*/
39 #define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
40 #define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
41 #define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
43 /* flags passed to a constructor func */
44 #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
45 #define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
46 #define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
51 extern void __init kmem_cache_init(void);
53 extern struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
55 void (*)(void *, struct kmem_cache *, unsigned long),
56 void (*)(void *, struct kmem_cache *, unsigned long));
57 extern void kmem_cache_destroy(struct kmem_cache *);
58 extern int kmem_cache_shrink(struct kmem_cache *);
59 extern void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
60 extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
61 extern void kmem_cache_free(struct kmem_cache *, void *);
62 extern unsigned int kmem_cache_size(struct kmem_cache *);
63 extern const char *kmem_cache_name(struct kmem_cache *);
65 /* Size description struct for general caches. */
68 struct kmem_cache *cs_cachep;
69 struct kmem_cache *cs_dmacachep;
71 extern struct cache_sizes malloc_sizes[];
73 extern void *__kmalloc(size_t, gfp_t);
76 * kmalloc - allocate memory
77 * @size: how many bytes of memory are required.
78 * @flags: the type of memory to allocate.
80 * kmalloc is the normal method of allocating memory
83 * The @flags argument may be one of:
85 * %GFP_USER - Allocate memory on behalf of user. May sleep.
87 * %GFP_KERNEL - Allocate normal kernel ram. May sleep.
89 * %GFP_ATOMIC - Allocation will not sleep.
90 * For example, use this inside interrupt handlers.
92 * %GFP_HIGHUSER - Allocate pages from high memory.
94 * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
96 * %GFP_NOFS - Do not make any fs calls while trying to get memory.
98 * Also it is possible to set different flags by OR'ing
99 * in one or more of the following additional @flags:
101 * %__GFP_COLD - Request cache-cold pages instead of
102 * trying to return cache-warm pages.
104 * %__GFP_DMA - Request memory from the DMA-capable zone.
106 * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
108 * %__GFP_HIGHMEM - Allocated memory may be from highmem.
110 * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
111 * (think twice before using).
113 * %__GFP_NORETRY - If memory is not immediately available,
114 * then give up at once.
116 * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
118 * %__GFP_REPEAT - If allocation fails initially, try once more before failing.
120 static inline void *kmalloc(size_t size, gfp_t flags)
122 if (__builtin_constant_p(size)) {
129 #include "kmalloc_sizes.h"
132 extern void __you_cannot_kmalloc_that_much(void);
133 __you_cannot_kmalloc_that_much();
136 return kmem_cache_alloc((flags & GFP_DMA) ?
137 malloc_sizes[i].cs_dmacachep :
138 malloc_sizes[i].cs_cachep, flags);
140 return __kmalloc(size, flags);
144 * kmalloc_track_caller is a special version of kmalloc that records the
145 * calling function of the routine calling it for slab leak tracking instead
146 * of just the calling function (confusing, eh?).
147 * It's useful when the call to kmalloc comes from a widely-used standard
148 * allocator where we care about the real place the memory allocation
149 * request comes from.
151 #ifndef CONFIG_DEBUG_SLAB
152 #define kmalloc_track_caller(size, flags) \
153 __kmalloc(size, flags)
155 extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
156 #define kmalloc_track_caller(size, flags) \
157 __kmalloc_track_caller(size, flags, __builtin_return_address(0))
160 extern void *__kzalloc(size_t, gfp_t);
163 * kzalloc - allocate memory. The memory is set to zero.
164 * @size: how many bytes of memory are required.
165 * @flags: the type of memory to allocate (see kmalloc).
167 static inline void *kzalloc(size_t size, gfp_t flags)
169 if (__builtin_constant_p(size)) {
176 #include "kmalloc_sizes.h"
179 extern void __you_cannot_kzalloc_that_much(void);
180 __you_cannot_kzalloc_that_much();
183 return kmem_cache_zalloc((flags & GFP_DMA) ?
184 malloc_sizes[i].cs_dmacachep :
185 malloc_sizes[i].cs_cachep, flags);
187 return __kzalloc(size, flags);
191 * kcalloc - allocate memory for an array. The memory is set to zero.
192 * @n: number of elements.
193 * @size: element size.
194 * @flags: the type of memory to allocate.
196 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
198 if (n != 0 && size > ULONG_MAX / n)
200 return kzalloc(n * size, flags);
203 extern void kfree(const void *);
204 extern unsigned int ksize(const void *);
205 extern int slab_is_available(void);
208 extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
209 extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
211 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
213 if (__builtin_constant_p(size)) {
220 #include "kmalloc_sizes.h"
223 extern void __you_cannot_kmalloc_that_much(void);
224 __you_cannot_kmalloc_that_much();
227 return kmem_cache_alloc_node((flags & GFP_DMA) ?
228 malloc_sizes[i].cs_dmacachep :
229 malloc_sizes[i].cs_cachep, flags, node);
231 return __kmalloc_node(size, flags, node);
235 * kmalloc_node_track_caller is a special version of kmalloc_node that
236 * records the calling function of the routine calling it for slab leak
237 * tracking instead of just the calling function (confusing, eh?).
238 * It's useful when the call to kmalloc_node comes from a widely-used
239 * standard allocator where we care about the real place the memory
240 * allocation request comes from.
242 #ifndef CONFIG_DEBUG_SLAB
243 #define kmalloc_node_track_caller(size, flags, node) \
244 __kmalloc_node(size, flags, node)
246 extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *);
247 #define kmalloc_node_track_caller(size, flags, node) \
248 __kmalloc_node_track_caller(size, flags, node, \
249 __builtin_return_address(0))
251 #else /* CONFIG_NUMA */
252 static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
253 gfp_t flags, int node)
255 return kmem_cache_alloc(cachep, flags);
257 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
259 return kmalloc(size, flags);
262 #define kmalloc_node_track_caller(size, flags, node) \
263 kmalloc_track_caller(size, flags)
266 extern int FASTCALL(kmem_cache_reap(int));
267 extern int FASTCALL(kmem_ptr_validate(struct kmem_cache *cachep, void *ptr));
269 #else /* CONFIG_SLOB */
271 /* SLOB allocator routines */
273 void kmem_cache_init(void);
274 struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
276 void (*)(void *, struct kmem_cache *, unsigned long),
277 void (*)(void *, struct kmem_cache *, unsigned long));
278 void kmem_cache_destroy(struct kmem_cache *c);
279 void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
280 void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
281 void kmem_cache_free(struct kmem_cache *c, void *b);
282 const char *kmem_cache_name(struct kmem_cache *);
283 void *kmalloc(size_t size, gfp_t flags);
284 void *__kzalloc(size_t size, gfp_t flags);
285 void kfree(const void *m);
286 unsigned int ksize(const void *m);
287 unsigned int kmem_cache_size(struct kmem_cache *c);
289 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
291 return __kzalloc(n * size, flags);
294 #define kmem_cache_shrink(d) (0)
295 #define kmem_cache_reap(a)
296 #define kmem_ptr_validate(a, b) (0)
297 #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
298 #define kmalloc_node(s, f, n) kmalloc(s, f)
299 #define kzalloc(s, f) __kzalloc(s, f)
300 #define kmalloc_track_caller kmalloc
302 #define kmalloc_node_track_caller kmalloc_node
304 #endif /* CONFIG_SLOB */
306 #endif /* __KERNEL__ */
308 #endif /* _LINUX_SLAB_H */