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/config.h> /* kmalloc_sizes.h needs CONFIG_ options */ 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 */ 20 21 /* flags for kmem_cache_alloc() */ 22 #define SLAB_NOFS GFP_NOFS 23 #define SLAB_NOIO GFP_NOIO 24 #define SLAB_ATOMIC GFP_ATOMIC 25 #define SLAB_USER GFP_USER 26 #define SLAB_KERNEL GFP_KERNEL 27 #define SLAB_DMA GFP_DMA 28 29 #define SLAB_LEVEL_MASK GFP_LEVEL_MASK 30 31 #define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */ 32 33 /* flags to pass to kmem_cache_create(). 34 * The first 3 are only valid when the allocator as been build 35 * SLAB_DEBUG_SUPPORT. 36 */ 37 #define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */ 38 #define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */ 39 #define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */ 40 #define SLAB_POISON 0x00000800UL /* Poison objects */ 41 #define SLAB_NO_REAP 0x00001000UL /* never reap from the cache */ 42 #define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */ 43 #define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */ 44 #define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */ 45 #define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */ 46 #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate 47 what is reclaimable later*/ 48 #define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */ 49 #define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */ 50 51 /* flags passed to a constructor func */ 52 #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */ 53 #define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */ 54 #define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */ 55 56 #ifndef CONFIG_SLOB 57 58 /* prototypes */ 59 extern void __init kmem_cache_init(void); 60 61 extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long, 62 void (*)(void *, kmem_cache_t *, unsigned long), 63 void (*)(void *, kmem_cache_t *, unsigned long)); 64 extern int kmem_cache_destroy(kmem_cache_t *); 65 extern int kmem_cache_shrink(kmem_cache_t *); 66 extern void *kmem_cache_alloc(kmem_cache_t *, 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 extern void *__kmalloc(size_t, gfp_t); 80 81 static inline void *kmalloc(size_t size, gfp_t flags) 82 { 83 if (__builtin_constant_p(size)) { 84 int i = 0; 85 #define CACHE(x) \ 86 if (size <= x) \ 87 goto found; \ 88 else \ 89 i++; 90 #include "kmalloc_sizes.h" 91 #undef CACHE 92 { 93 extern void __you_cannot_kmalloc_that_much(void); 94 __you_cannot_kmalloc_that_much(); 95 } 96 found: 97 return kmem_cache_alloc((flags & GFP_DMA) ? 98 malloc_sizes[i].cs_dmacachep : 99 malloc_sizes[i].cs_cachep, flags); 100 } 101 return __kmalloc(size, flags); 102 } 103 104 extern void *kzalloc(size_t, gfp_t); 105 106 /** 107 * kcalloc - allocate memory for an array. The memory is set to zero. 108 * @n: number of elements. 109 * @size: element size. 110 * @flags: the type of memory to allocate. 111 */ 112 static inline void *kcalloc(size_t n, size_t size, gfp_t flags) 113 { 114 if (n != 0 && size > INT_MAX / n) 115 return NULL; 116 return kzalloc(n * size, flags); 117 } 118 119 extern void kfree(const void *); 120 extern unsigned int ksize(const void *); 121 122 #ifdef CONFIG_NUMA 123 extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node); 124 extern void *kmalloc_node(size_t size, gfp_t flags, int node); 125 #else 126 static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node) 127 { 128 return kmem_cache_alloc(cachep, flags); 129 } 130 static inline void *kmalloc_node(size_t size, gfp_t flags, int node) 131 { 132 return kmalloc(size, flags); 133 } 134 #endif 135 136 extern int FASTCALL(kmem_cache_reap(int)); 137 extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)); 138 139 #else /* CONFIG_SLOB */ 140 141 /* SLOB allocator routines */ 142 143 void kmem_cache_init(void); 144 struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags); 145 struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t, 146 unsigned long, 147 void (*)(void *, struct kmem_cache *, unsigned long), 148 void (*)(void *, struct kmem_cache *, unsigned long)); 149 int kmem_cache_destroy(struct kmem_cache *c); 150 void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags); 151 void kmem_cache_free(struct kmem_cache *c, void *b); 152 const char *kmem_cache_name(struct kmem_cache *); 153 void *kmalloc(size_t size, gfp_t flags); 154 void *kzalloc(size_t size, gfp_t flags); 155 void kfree(const void *m); 156 unsigned int ksize(const void *m); 157 unsigned int kmem_cache_size(struct kmem_cache *c); 158 159 static inline void *kcalloc(size_t n, size_t size, gfp_t flags) 160 { 161 return kzalloc(n * size, flags); 162 } 163 164 #define kmem_cache_shrink(d) (0) 165 #define kmem_cache_reap(a) 166 #define kmem_ptr_validate(a, b) (0) 167 #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f) 168 #define kmalloc_node(s, f, n) kmalloc(s, f) 169 170 #endif /* CONFIG_SLOB */ 171 172 /* System wide caches */ 173 extern kmem_cache_t *vm_area_cachep; 174 extern kmem_cache_t *names_cachep; 175 extern kmem_cache_t *files_cachep; 176 extern kmem_cache_t *filp_cachep; 177 extern kmem_cache_t *fs_cachep; 178 extern kmem_cache_t *signal_cachep; 179 extern kmem_cache_t *sighand_cachep; 180 extern kmem_cache_t *bio_cachep; 181 182 extern atomic_t slab_reclaim_pages; 183 184 #endif /* __KERNEL__ */ 185 186 #endif /* _LINUX_SLAB_H */ 187