[PATCH] remove kernel/lockdep.c:lockdep_internal
[usb.git] / include / linux / slab.h
blob2271886744f87a5fb43d5f307b7c062dc54528c1
1 /*
2 * linux/include/linux/slab.h
3 * Written by Mark Hemment, 1996.
4 * (markhe@nextd.demon.co.uk)
5 */
7 #ifndef _LINUX_SLAB_H
8 #define _LINUX_SLAB_H
10 #ifdef __KERNEL__
12 #include <linux/gfp.h>
13 #include <linux/init.h>
14 #include <linux/types.h>
15 #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
16 #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
17 #include <linux/compiler.h>
19 /* kmem_cache_t exists for legacy reasons and is not used by code in mm */
20 typedef struct kmem_cache kmem_cache_t __deprecated;
22 /* flags to pass to kmem_cache_create().
23 * The first 3 are only valid when the allocator as been build
24 * SLAB_DEBUG_SUPPORT.
26 #define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
27 #define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
28 #define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
29 #define SLAB_POISON 0x00000800UL /* Poison objects */
30 #define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
31 #define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
32 #define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
33 #define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
34 #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
35 what is reclaimable later*/
36 #define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
37 #define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
38 #define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
40 /* flags passed to a constructor func */
41 #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
42 #define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
43 #define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
45 #ifndef CONFIG_SLOB
47 /* prototypes */
48 extern void __init kmem_cache_init(void);
50 extern struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
51 unsigned long,
52 void (*)(void *, struct kmem_cache *, unsigned long),
53 void (*)(void *, struct kmem_cache *, unsigned long));
54 extern void kmem_cache_destroy(struct kmem_cache *);
55 extern int kmem_cache_shrink(struct kmem_cache *);
56 extern void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
57 extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
58 extern void kmem_cache_free(struct kmem_cache *, void *);
59 extern unsigned int kmem_cache_size(struct kmem_cache *);
60 extern const char *kmem_cache_name(struct kmem_cache *);
62 /* Size description struct for general caches. */
63 struct cache_sizes {
64 size_t cs_size;
65 struct kmem_cache *cs_cachep;
66 struct kmem_cache *cs_dmacachep;
68 extern struct cache_sizes malloc_sizes[];
70 extern void *__kmalloc(size_t, gfp_t);
72 /**
73 * kmalloc - allocate memory
74 * @size: how many bytes of memory are required.
75 * @flags: the type of memory to allocate.
77 * kmalloc is the normal method of allocating memory
78 * in the kernel.
80 * The @flags argument may be one of:
82 * %GFP_USER - Allocate memory on behalf of user. May sleep.
84 * %GFP_KERNEL - Allocate normal kernel ram. May sleep.
86 * %GFP_ATOMIC - Allocation will not sleep.
87 * For example, use this inside interrupt handlers.
89 * %GFP_HIGHUSER - Allocate pages from high memory.
91 * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
93 * %GFP_NOFS - Do not make any fs calls while trying to get memory.
95 * Also it is possible to set different flags by OR'ing
96 * in one or more of the following additional @flags:
98 * %__GFP_COLD - Request cache-cold pages instead of
99 * trying to return cache-warm pages.
101 * %__GFP_DMA - Request memory from the DMA-capable zone.
103 * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
105 * %__GFP_HIGHMEM - Allocated memory may be from highmem.
107 * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
108 * (think twice before using).
110 * %__GFP_NORETRY - If memory is not immediately available,
111 * then give up at once.
113 * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
115 * %__GFP_REPEAT - If allocation fails initially, try once more before failing.
117 static inline void *kmalloc(size_t size, gfp_t flags)
119 if (__builtin_constant_p(size)) {
120 int i = 0;
121 #define CACHE(x) \
122 if (size <= x) \
123 goto found; \
124 else \
125 i++;
126 #include "kmalloc_sizes.h"
127 #undef CACHE
129 extern void __you_cannot_kmalloc_that_much(void);
130 __you_cannot_kmalloc_that_much();
132 found:
133 return kmem_cache_alloc((flags & GFP_DMA) ?
134 malloc_sizes[i].cs_dmacachep :
135 malloc_sizes[i].cs_cachep, flags);
137 return __kmalloc(size, flags);
141 * kmalloc_track_caller is a special version of kmalloc that records the
142 * calling function of the routine calling it for slab leak tracking instead
143 * of just the calling function (confusing, eh?).
144 * It's useful when the call to kmalloc comes from a widely-used standard
145 * allocator where we care about the real place the memory allocation
146 * request comes from.
148 #ifndef CONFIG_DEBUG_SLAB
149 #define kmalloc_track_caller(size, flags) \
150 __kmalloc(size, flags)
151 #else
152 extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
153 #define kmalloc_track_caller(size, flags) \
154 __kmalloc_track_caller(size, flags, __builtin_return_address(0))
155 #endif
157 extern void *__kzalloc(size_t, gfp_t);
160 * kzalloc - allocate memory. The memory is set to zero.
161 * @size: how many bytes of memory are required.
162 * @flags: the type of memory to allocate (see kmalloc).
164 static inline void *kzalloc(size_t size, gfp_t flags)
166 if (__builtin_constant_p(size)) {
167 int i = 0;
168 #define CACHE(x) \
169 if (size <= x) \
170 goto found; \
171 else \
172 i++;
173 #include "kmalloc_sizes.h"
174 #undef CACHE
176 extern void __you_cannot_kzalloc_that_much(void);
177 __you_cannot_kzalloc_that_much();
179 found:
180 return kmem_cache_zalloc((flags & GFP_DMA) ?
181 malloc_sizes[i].cs_dmacachep :
182 malloc_sizes[i].cs_cachep, flags);
184 return __kzalloc(size, flags);
188 * kcalloc - allocate memory for an array. The memory is set to zero.
189 * @n: number of elements.
190 * @size: element size.
191 * @flags: the type of memory to allocate.
193 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
195 if (n != 0 && size > ULONG_MAX / n)
196 return NULL;
197 return kzalloc(n * size, flags);
200 extern void kfree(const void *);
201 extern unsigned int ksize(const void *);
202 extern int slab_is_available(void);
204 #ifdef CONFIG_NUMA
205 extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
206 extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
208 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
210 if (__builtin_constant_p(size)) {
211 int i = 0;
212 #define CACHE(x) \
213 if (size <= x) \
214 goto found; \
215 else \
216 i++;
217 #include "kmalloc_sizes.h"
218 #undef CACHE
220 extern void __you_cannot_kmalloc_that_much(void);
221 __you_cannot_kmalloc_that_much();
223 found:
224 return kmem_cache_alloc_node((flags & GFP_DMA) ?
225 malloc_sizes[i].cs_dmacachep :
226 malloc_sizes[i].cs_cachep, flags, node);
228 return __kmalloc_node(size, flags, node);
232 * kmalloc_node_track_caller is a special version of kmalloc_node that
233 * records the calling function of the routine calling it for slab leak
234 * tracking instead of just the calling function (confusing, eh?).
235 * It's useful when the call to kmalloc_node comes from a widely-used
236 * standard allocator where we care about the real place the memory
237 * allocation request comes from.
239 #ifndef CONFIG_DEBUG_SLAB
240 #define kmalloc_node_track_caller(size, flags, node) \
241 __kmalloc_node(size, flags, node)
242 #else
243 extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *);
244 #define kmalloc_node_track_caller(size, flags, node) \
245 __kmalloc_node_track_caller(size, flags, node, \
246 __builtin_return_address(0))
247 #endif
248 #else /* CONFIG_NUMA */
249 static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
250 gfp_t flags, int node)
252 return kmem_cache_alloc(cachep, flags);
254 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
256 return kmalloc(size, flags);
259 #define kmalloc_node_track_caller(size, flags, node) \
260 kmalloc_track_caller(size, flags)
261 #endif
263 extern int FASTCALL(kmem_cache_reap(int));
264 extern int FASTCALL(kmem_ptr_validate(struct kmem_cache *cachep, void *ptr));
266 #else /* CONFIG_SLOB */
268 /* SLOB allocator routines */
270 void kmem_cache_init(void);
271 struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
272 unsigned long,
273 void (*)(void *, struct kmem_cache *, unsigned long),
274 void (*)(void *, struct kmem_cache *, unsigned long));
275 void kmem_cache_destroy(struct kmem_cache *c);
276 void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
277 void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
278 void kmem_cache_free(struct kmem_cache *c, void *b);
279 const char *kmem_cache_name(struct kmem_cache *);
280 void *kmalloc(size_t size, gfp_t flags);
281 void *__kzalloc(size_t size, gfp_t flags);
282 void kfree(const void *m);
283 unsigned int ksize(const void *m);
284 unsigned int kmem_cache_size(struct kmem_cache *c);
286 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
288 return __kzalloc(n * size, flags);
291 #define kmem_cache_shrink(d) (0)
292 #define kmem_cache_reap(a)
293 #define kmem_ptr_validate(a, b) (0)
294 #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
295 #define kmalloc_node(s, f, n) kmalloc(s, f)
296 #define kzalloc(s, f) __kzalloc(s, f)
297 #define kmalloc_track_caller kmalloc
299 #define kmalloc_node_track_caller kmalloc_node
301 #endif /* CONFIG_SLOB */
303 #endif /* __KERNEL__ */
305 #endif /* _LINUX_SLAB_H */