1/* 2 * linux/mm/slab.h 3 * Written by Mark Hemment, 1996. 4 * (markhe@nextd.demon.co.uk) 5 */ 6 7#ifndef _LINUX_SLAB_H 8#define _LINUX_SLAB_H 9 10#if defined(__KERNEL__) 11 12typedef 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 */ 58extern void __init kmem_cache_init(void); 59 60extern 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)); 63extern int kmem_cache_destroy(kmem_cache_t *); 64extern int kmem_cache_shrink(kmem_cache_t *); 65extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t); 66extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t); 67extern void kmem_cache_free(kmem_cache_t *, void *); 68extern unsigned int kmem_cache_size(kmem_cache_t *); 69extern const char *kmem_cache_name(kmem_cache_t *); 70extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags); 71 72/* Size description struct for general caches. */ 73struct cache_sizes { 74 size_t cs_size; 75 kmem_cache_t *cs_cachep; 76 kmem_cache_t *cs_dmacachep; 77}; 78extern struct cache_sizes malloc_sizes[]; 79 80extern void *__kmalloc(size_t, gfp_t); 81#ifndef CONFIG_DEBUG_SLAB 82#define ____kmalloc(size, flags) __kmalloc(size, flags) 83#else 84extern 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/** 90 * kmalloc - allocate memory 91 * @size: how many bytes of memory are required. 92 * @flags: the type of memory to allocate. 93 * 94 * kmalloc is the normal method of allocating memory 95 * in the kernel. 96 * 97 * The @flags argument may be one of: 98 * 99 * %GFP_USER - Allocate memory on behalf of user. May sleep. 100 * 101 * %GFP_KERNEL - Allocate normal kernel ram. May sleep. 102 * 103 * %GFP_ATOMIC - Allocation will not sleep. 104 * For example, use this inside interrupt handlers. 105 * 106 * %GFP_HIGHUSER - Allocate pages from high memory. 107 * 108 * %GFP_NOIO - Do not do any I/O at all while trying to get memory. 109 * 110 * %GFP_NOFS - Do not make any fs calls while trying to get memory. 111 * 112 * Also it is possible to set different flags by OR'ing 113 * in one or more of the following additional @flags: 114 * 115 * %__GFP_COLD - Request cache-cold pages instead of 116 * trying to return cache-warm pages. 117 * 118 * %__GFP_DMA - Request memory from the DMA-capable zone. 119 * 120 * %__GFP_HIGH - This allocation has high priority and may use emergency pools. 121 * 122 * %__GFP_HIGHMEM - Allocated memory may be from highmem. 123 * 124 * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail 125 * (think twice before using). 126 * 127 * %__GFP_NORETRY - If memory is not immediately available, 128 * then give up at once. 129 * 130 * %__GFP_NOWARN - If allocation fails, don't issue any warnings. 131 * 132 * %__GFP_REPEAT - If allocation fails initially, try once more before failing. 133 */ 134static inline void *kmalloc(size_t size, gfp_t flags) 135{ 136 if (__builtin_constant_p(size)) { 137 int i = 0; 138#define CACHE(x) \ 139 if (size <= x) \ 140 goto found; \ 141 else \ 142 i++; 143#include "kmalloc_sizes.h" 144#undef CACHE 145 { 146 extern void __you_cannot_kmalloc_that_much(void); 147 __you_cannot_kmalloc_that_much(); 148 } 149found: 150 return kmem_cache_alloc((flags & GFP_DMA) ? 151 malloc_sizes[i].cs_dmacachep : 152 malloc_sizes[i].cs_cachep, flags); 153 } 154 return __kmalloc(size, flags); 155} 156 157extern void *__kzalloc(size_t, gfp_t); 158 159/** 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). 163 */ 164static inline void *kzalloc(size_t size, gfp_t flags) 165{ 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 175 { 176 extern void __you_cannot_kzalloc_that_much(void); 177 __you_cannot_kzalloc_that_much(); 178 } 179found: 180 return kmem_cache_zalloc((flags & GFP_DMA) ? 181 malloc_sizes[i].cs_dmacachep : 182 malloc_sizes[i].cs_cachep, flags); 183 } 184 return __kzalloc(size, flags); 185} 186 187/** 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. 192 */ 193static inline void *kcalloc(size_t n, size_t size, gfp_t flags) 194{ 195 if (n != 0 && size > ULONG_MAX / n) 196 return NULL; 197 return kzalloc(n * size, flags); 198} 199 200extern void kfree(const void *); 201extern unsigned int ksize(const void *); 202extern int slab_is_available(void); 203 204#ifdef CONFIG_NUMA 205extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node); 206extern void *kmalloc_node(size_t size, gfp_t flags, int node); 207#else 208static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node) 209{ 210 return kmem_cache_alloc(cachep, flags); 211} 212static inline void *kmalloc_node(size_t size, gfp_t flags, int node) 213{ 214 return kmalloc(size, flags); 215} 216#endif 217 218extern int FASTCALL(kmem_cache_reap(int)); 219extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)); 220 221#else /* CONFIG_SLOB */ 222 223/* SLOB allocator routines */ 224 225void kmem_cache_init(void); 226struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags); 227struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t, 228 unsigned long, 229 void (*)(void *, struct kmem_cache *, unsigned long), 230 void (*)(void *, struct kmem_cache *, unsigned long)); 231int kmem_cache_destroy(struct kmem_cache *c); 232void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags); 233void *kmem_cache_zalloc(struct kmem_cache *, gfp_t); 234void kmem_cache_free(struct kmem_cache *c, void *b); 235const char *kmem_cache_name(struct kmem_cache *); 236void *kmalloc(size_t size, gfp_t flags); 237void *__kzalloc(size_t size, gfp_t flags); 238void kfree(const void *m); 239unsigned int ksize(const void *m); 240unsigned int kmem_cache_size(struct kmem_cache *c); 241 242static inline void *kcalloc(size_t n, size_t size, gfp_t flags) 243{ 244 return __kzalloc(n * size, flags); 245} 246 247#define kmem_cache_shrink(d) (0) 248#define kmem_cache_reap(a) 249#define kmem_ptr_validate(a, b) (0) 250#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f) 251#define kmalloc_node(s, f, n) kmalloc(s, f) 252#define kzalloc(s, f) __kzalloc(s, f) 253#define ____kmalloc kmalloc 254 255#endif /* CONFIG_SLOB */ 256 257/* System wide caches */ 258extern kmem_cache_t *vm_area_cachep; 259extern kmem_cache_t *names_cachep; 260extern kmem_cache_t *files_cachep; 261extern kmem_cache_t *filp_cachep; 262extern kmem_cache_t *fs_cachep; 263extern kmem_cache_t *sighand_cachep; 264extern kmem_cache_t *bio_cachep; 265 266extern atomic_t slab_reclaim_pages; 267 268#endif /* __KERNEL__ */ 269 270#endif /* _LINUX_SLAB_H */ 271