1 /* 2 * linux/mm/slab.h 3 * Written by Mark Hemment, 1996. 4 * ([email protected]) 5 */ 6 7 #ifndef _LINUX_SLAB_H 8 #define _LINUX_SLAB_H 9 10 #if defined(__KERNEL__) 11 12 typedef struct kmem_cache kmem_cache_t; 13 14 #include <linux/gfp.h> 15 #include <linux/init.h> 16 #include <linux/types.h> 17 #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */ 18 #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */ 19 20 /* flags for kmem_cache_alloc() */ 21 #define SLAB_NOFS GFP_NOFS 22 #define SLAB_NOIO GFP_NOIO 23 #define SLAB_ATOMIC GFP_ATOMIC 24 #define SLAB_USER GFP_USER 25 #define SLAB_KERNEL GFP_KERNEL 26 #define SLAB_DMA GFP_DMA 27 28 #define SLAB_LEVEL_MASK GFP_LEVEL_MASK 29 30 #define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */ 31 32 /* flags to pass to kmem_cache_create(). 33 * The first 3 are only valid when the allocator as been build 34 * SLAB_DEBUG_SUPPORT. 35 */ 36 #define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */ 37 #define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */ 38 #define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */ 39 #define SLAB_POISON 0x00000800UL /* Poison objects */ 40 #define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */ 41 #define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */ 42 #define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */ 43 #define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */ 44 #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate 45 what is reclaimable later*/ 46 #define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */ 47 #define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */ 48 #define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */ 49 50 /* flags passed to a constructor func */ 51 #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */ 52 #define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */ 53 #define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */ 54 55 #ifndef CONFIG_SLOB 56 57 /* prototypes */ 58 extern void __init kmem_cache_init(void); 59 60 extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long, 61 void (*)(void *, kmem_cache_t *, unsigned long), 62 void (*)(void *, kmem_cache_t *, unsigned long)); 63 extern int kmem_cache_destroy(kmem_cache_t *); 64 extern int kmem_cache_shrink(kmem_cache_t *); 65 extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t); 66 extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t); 67 extern void kmem_cache_free(kmem_cache_t *, void *); 68 extern unsigned int kmem_cache_size(kmem_cache_t *); 69 extern const char *kmem_cache_name(kmem_cache_t *); 70 extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags); 71 72 /* Size description struct for general caches. */ 73 struct cache_sizes { 74 size_t cs_size; 75 kmem_cache_t *cs_cachep; 76 kmem_cache_t *cs_dmacachep; 77 }; 78 extern struct cache_sizes malloc_sizes[]; 79 80 extern void *__kmalloc(size_t, gfp_t); 81 #ifndef CONFIG_DEBUG_SLAB 82 #define ____kmalloc(size, flags) __kmalloc(size, flags) 83 #else 84 extern void *__kmalloc_track_caller(size_t, gfp_t, void*); 85 #define ____kmalloc(size, flags) \ 86 __kmalloc_track_caller(size, flags, __builtin_return_address(0)) 87 #endif 88 89 static inline void *kmalloc(size_t size, gfp_t flags) 90 { 91 if (__builtin_constant_p(size)) { 92 int i = 0; 93 #define CACHE(x) \ 94 if (size <= x) \ 95 goto found; \ 96 else \ 97 i++; 98 #include "kmalloc_sizes.h" 99 #undef CACHE 100 { 101 extern void __you_cannot_kmalloc_that_much(void); 102 __you_cannot_kmalloc_that_much(); 103 } 104 found: 105 return kmem_cache_alloc((flags & GFP_DMA) ? 106 malloc_sizes[i].cs_dmacachep : 107 malloc_sizes[i].cs_cachep, flags); 108 } 109 return __kmalloc(size, flags); 110 } 111 112 extern void *__kzalloc(size_t, gfp_t); 113 114 static inline void *kzalloc(size_t size, gfp_t flags) 115 { 116 if (__builtin_constant_p(size)) { 117 int i = 0; 118 #define CACHE(x) \ 119 if (size <= x) \ 120 goto found; \ 121 else \ 122 i++; 123 #include "kmalloc_sizes.h" 124 #undef CACHE 125 { 126 extern void __you_cannot_kzalloc_that_much(void); 127 __you_cannot_kzalloc_that_much(); 128 } 129 found: 130 return kmem_cache_zalloc((flags & GFP_DMA) ? 131 malloc_sizes[i].cs_dmacachep : 132 malloc_sizes[i].cs_cachep, flags); 133 } 134 return __kzalloc(size, flags); 135 } 136 137 /** 138 * kcalloc - allocate memory for an array. The memory is set to zero. 139 * @n: number of elements. 140 * @size: element size. 141 * @flags: the type of memory to allocate. 142 */ 143 static inline void *kcalloc(size_t n, size_t size, gfp_t flags) 144 { 145 if (n != 0 && size > ULONG_MAX / n) 146 return NULL; 147 return kzalloc(n * size, flags); 148 } 149 150 extern void kfree(const void *); 151 extern unsigned int ksize(const void *); 152 extern int slab_is_available(void); 153 154 #ifdef CONFIG_NUMA 155 extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node); 156 extern void *kmalloc_node(size_t size, gfp_t flags, int node); 157 #else 158 static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node) 159 { 160 return kmem_cache_alloc(cachep, flags); 161 } 162 static inline void *kmalloc_node(size_t size, gfp_t flags, int node) 163 { 164 return kmalloc(size, flags); 165 } 166 #endif 167 168 extern int FASTCALL(kmem_cache_reap(int)); 169 extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)); 170 171 #else /* CONFIG_SLOB */ 172 173 /* SLOB allocator routines */ 174 175 void kmem_cache_init(void); 176 struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags); 177 struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t, 178 unsigned long, 179 void (*)(void *, struct kmem_cache *, unsigned long), 180 void (*)(void *, struct kmem_cache *, unsigned long)); 181 int kmem_cache_destroy(struct kmem_cache *c); 182 void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags); 183 void *kmem_cache_zalloc(struct kmem_cache *, gfp_t); 184 void kmem_cache_free(struct kmem_cache *c, void *b); 185 const char *kmem_cache_name(struct kmem_cache *); 186 void *kmalloc(size_t size, gfp_t flags); 187 void *__kzalloc(size_t size, gfp_t flags); 188 void kfree(const void *m); 189 unsigned int ksize(const void *m); 190 unsigned int kmem_cache_size(struct kmem_cache *c); 191 192 static inline void *kcalloc(size_t n, size_t size, gfp_t flags) 193 { 194 return __kzalloc(n * size, flags); 195 } 196 197 #define kmem_cache_shrink(d) (0) 198 #define kmem_cache_reap(a) 199 #define kmem_ptr_validate(a, b) (0) 200 #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f) 201 #define kmalloc_node(s, f, n) kmalloc(s, f) 202 #define kzalloc(s, f) __kzalloc(s, f) 203 #define ____kmalloc kmalloc 204 205 #endif /* CONFIG_SLOB */ 206 207 /* System wide caches */ 208 extern kmem_cache_t *vm_area_cachep; 209 extern kmem_cache_t *names_cachep; 210 extern kmem_cache_t *files_cachep; 211 extern kmem_cache_t *filp_cachep; 212 extern kmem_cache_t *fs_cachep; 213 extern kmem_cache_t *sighand_cachep; 214 extern kmem_cache_t *bio_cachep; 215 216 extern atomic_t slab_reclaim_pages; 217 218 #endif /* __KERNEL__ */ 219 220 #endif /* _LINUX_SLAB_H */ 221