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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/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_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
42#define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
43#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
44#define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
45#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
46 what is reclaimable later*/
47#define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
48#define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
49#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
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 */
59extern void __init kmem_cache_init(void);
60
61extern 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));
64extern int kmem_cache_destroy(kmem_cache_t *);
65extern int kmem_cache_shrink(kmem_cache_t *);
66extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
67extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
68extern void kmem_cache_free(kmem_cache_t *, void *);
69extern unsigned int kmem_cache_size(kmem_cache_t *);
70extern const char *kmem_cache_name(kmem_cache_t *);
71extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);
72
73/* Size description struct for general caches. */
74struct cache_sizes {
75 size_t cs_size;
76 kmem_cache_t *cs_cachep;
77 kmem_cache_t *cs_dmacachep;
78};
79extern struct cache_sizes malloc_sizes[];
80
81extern void *__kmalloc(size_t, gfp_t);
82#ifndef CONFIG_DEBUG_SLAB
83#define ____kmalloc(size, flags) __kmalloc(size, flags)
84#else
85extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
86#define ____kmalloc(size, flags) \
87 __kmalloc_track_caller(size, flags, __builtin_return_address(0))
88#endif
89
90static inline void *kmalloc(size_t size, gfp_t flags)
91{
92 if (__builtin_constant_p(size)) {
93 int i = 0;
94#define CACHE(x) \
95 if (size <= x) \
96 goto found; \
97 else \
98 i++;
99#include "kmalloc_sizes.h"
100#undef CACHE
101 {
102 extern void __you_cannot_kmalloc_that_much(void);
103 __you_cannot_kmalloc_that_much();
104 }
105found:
106 return kmem_cache_alloc((flags & GFP_DMA) ?
107 malloc_sizes[i].cs_dmacachep :
108 malloc_sizes[i].cs_cachep, flags);
109 }
110 return __kmalloc(size, flags);
111}
112
113extern void *__kzalloc(size_t, gfp_t);
114
115static inline void *kzalloc(size_t size, gfp_t flags)
116{
117 if (__builtin_constant_p(size)) {
118 int i = 0;
119#define CACHE(x) \
120 if (size <= x) \
121 goto found; \
122 else \
123 i++;
124#include "kmalloc_sizes.h"
125#undef CACHE
126 {
127 extern void __you_cannot_kzalloc_that_much(void);
128 __you_cannot_kzalloc_that_much();
129 }
130found:
131 return kmem_cache_zalloc((flags & GFP_DMA) ?
132 malloc_sizes[i].cs_dmacachep :
133 malloc_sizes[i].cs_cachep, flags);
134 }
135 return __kzalloc(size, flags);
136}
137
138/**
139 * kcalloc - allocate memory for an array. The memory is set to zero.
140 * @n: number of elements.
141 * @size: element size.
142 * @flags: the type of memory to allocate.
143 */
144static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
145{
146 if (n != 0 && size > ULONG_MAX / n)
147 return NULL;
148 return kzalloc(n * size, flags);
149}
150
151extern void kfree(const void *);
152extern unsigned int ksize(const void *);
153extern int slab_is_available(void);
154
155#ifdef CONFIG_NUMA
156extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
157extern void *kmalloc_node(size_t size, gfp_t flags, int node);
158#else
159static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
160{
161 return kmem_cache_alloc(cachep, flags);
162}
163static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
164{
165 return kmalloc(size, flags);
166}
167#endif
168
169extern int FASTCALL(kmem_cache_reap(int));
170extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
171
172#else /* CONFIG_SLOB */
173
174/* SLOB allocator routines */
175
176void kmem_cache_init(void);
177struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags);
178struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
179 unsigned long,
180 void (*)(void *, struct kmem_cache *, unsigned long),
181 void (*)(void *, struct kmem_cache *, unsigned long));
182int kmem_cache_destroy(struct kmem_cache *c);
183void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
184void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
185void kmem_cache_free(struct kmem_cache *c, void *b);
186const char *kmem_cache_name(struct kmem_cache *);
187void *kmalloc(size_t size, gfp_t flags);
188void *__kzalloc(size_t size, gfp_t flags);
189void kfree(const void *m);
190unsigned int ksize(const void *m);
191unsigned int kmem_cache_size(struct kmem_cache *c);
192
193static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
194{
195 return __kzalloc(n * size, flags);
196}
197
198#define kmem_cache_shrink(d) (0)
199#define kmem_cache_reap(a)
200#define kmem_ptr_validate(a, b) (0)
201#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
202#define kmalloc_node(s, f, n) kmalloc(s, f)
203#define kzalloc(s, f) __kzalloc(s, f)
204#define ____kmalloc kmalloc
205
206#endif /* CONFIG_SLOB */
207
208/* System wide caches */
209extern kmem_cache_t *vm_area_cachep;
210extern kmem_cache_t *names_cachep;
211extern kmem_cache_t *files_cachep;
212extern kmem_cache_t *filp_cachep;
213extern kmem_cache_t *fs_cachep;
214extern kmem_cache_t *sighand_cachep;
215extern kmem_cache_t *bio_cachep;
216
217extern atomic_t slab_reclaim_pages;
218
219#endif /* __KERNEL__ */
220
221#endif /* _LINUX_SLAB_H */