include/linux/slab.h

   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
  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 */