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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Pekka J Enberg2109a2d2005-11-07 00:58:01 -080012typedef struct kmem_cache kmem_cache_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#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 */
Paul Jackson101a5002006-03-24 03:16:07 -080048#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
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
Matt Mackall10cef602006-01-08 01:01:45 -080055#ifndef CONFIG_SLOB
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057/* 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 *);
Al Virodd0fc662005-10-07 07:46:04 +010065extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
Pekka Enberga8c0f9a2006-03-25 03:06:42 -080066extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067extern void kmem_cache_free(kmem_cache_t *, void *);
68extern unsigned int kmem_cache_size(kmem_cache_t *);
Arnaldo Carvalho de Melo19449722005-06-18 22:46:19 -070069extern const char *kmem_cache_name(kmem_cache_t *);
Al Virodd0fc662005-10-07 07:46:04 +010070extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
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[];
Pekka Enberg7fd6b142006-02-01 03:05:52 -080079
Al Virodd0fc662005-10-07 07:46:04 +010080extern void *__kmalloc(size_t, gfp_t);
Al Viro871751e2006-03-25 03:06:39 -080081#ifndef CONFIG_DEBUG_SLAB
82#define ____kmalloc(size, flags) __kmalloc(size, flags)
Pekka Enberg7fd6b142006-02-01 03:05:52 -080083#else
84extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
Al Viro871751e2006-03-25 03:06:39 -080085#define ____kmalloc(size, flags) \
Pekka Enberg7fd6b142006-02-01 03:05:52 -080086 __kmalloc_track_caller(size, flags, __builtin_return_address(0))
87#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Al Virodd0fc662005-10-07 07:46:04 +010089static inline void *kmalloc(size_t size, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
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 }
104found:
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
Pekka Enberg40c07ae2006-03-25 03:06:43 -0800112extern void *__kzalloc(size_t, gfp_t);
113
114static 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 }
129found:
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}
Pekka J Enbergdd392712005-09-06 15:18:31 -0700136
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 */
Al Virodd0fc662005-10-07 07:46:04 +0100143static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
Pekka J Enbergdd392712005-09-06 15:18:31 -0700144{
Adrian Bunkb50ec7d2006-03-22 00:08:09 -0800145 if (n != 0 && size > ULONG_MAX / n)
Pekka J Enbergdd392712005-09-06 15:18:31 -0700146 return NULL;
147 return kzalloc(n * size, flags);
148}
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150extern void kfree(const void *);
151extern unsigned int ksize(const void *);
Mike Kravetz39d24e62006-05-15 09:44:13 -0700152extern int slab_is_available(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Manfred Spraul97e2bde2005-05-01 08:58:38 -0700154#ifdef CONFIG_NUMA
Al Virodd0fc662005-10-07 07:46:04 +0100155extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
156extern void *kmalloc_node(size_t size, gfp_t flags, int node);
Manfred Spraul97e2bde2005-05-01 08:58:38 -0700157#else
Al Viro6daa0e22005-10-21 03:18:50 -0400158static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
Manfred Spraul97e2bde2005-05-01 08:58:38 -0700159{
160 return kmem_cache_alloc(cachep, flags);
161}
Al Virodd0fc662005-10-07 07:46:04 +0100162static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
Manfred Spraul97e2bde2005-05-01 08:58:38 -0700163{
164 return kmalloc(size, flags);
165}
166#endif
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168extern int FASTCALL(kmem_cache_reap(int));
169extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
170
Matt Mackall10cef602006-01-08 01:01:45 -0800171#else /* CONFIG_SLOB */
172
173/* SLOB allocator routines */
174
175void kmem_cache_init(void);
176struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags);
177struct 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));
181int kmem_cache_destroy(struct kmem_cache *c);
182void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
Pekka Enberga8c0f9a2006-03-25 03:06:42 -0800183void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
Matt Mackall10cef602006-01-08 01:01:45 -0800184void kmem_cache_free(struct kmem_cache *c, void *b);
185const char *kmem_cache_name(struct kmem_cache *);
186void *kmalloc(size_t size, gfp_t flags);
Pekka Enberg40c07ae2006-03-25 03:06:43 -0800187void *__kzalloc(size_t size, gfp_t flags);
Matt Mackall10cef602006-01-08 01:01:45 -0800188void kfree(const void *m);
189unsigned int ksize(const void *m);
190unsigned int kmem_cache_size(struct kmem_cache *c);
191
192static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
193{
Pekka Enberg40c07ae2006-03-25 03:06:43 -0800194 return __kzalloc(n * size, flags);
Matt Mackall10cef602006-01-08 01:01:45 -0800195}
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)
Pekka Enberg40c07ae2006-03-25 03:06:43 -0800202#define kzalloc(s, f) __kzalloc(s, f)
Al Viro871751e2006-03-25 03:06:39 -0800203#define ____kmalloc kmalloc
Matt Mackall10cef602006-01-08 01:01:45 -0800204
205#endif /* CONFIG_SLOB */
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207/* System wide caches */
208extern kmem_cache_t *vm_area_cachep;
209extern kmem_cache_t *names_cachep;
210extern kmem_cache_t *files_cachep;
211extern kmem_cache_t *filp_cachep;
212extern kmem_cache_t *fs_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213extern kmem_cache_t *sighand_cachep;
214extern kmem_cache_t *bio_cachep;
215
216extern atomic_t slab_reclaim_pages;
217
218#endif /* __KERNEL__ */
219
220#endif /* _LINUX_SLAB_H */