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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_s 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/* prototypes */
57extern void __init kmem_cache_init(void);
58
59extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
60 void (*)(void *, kmem_cache_t *, unsigned long),
61 void (*)(void *, kmem_cache_t *, unsigned long));
62extern int kmem_cache_destroy(kmem_cache_t *);
63extern int kmem_cache_shrink(kmem_cache_t *);
64extern void *kmem_cache_alloc(kmem_cache_t *, unsigned int __nocast);
65extern void kmem_cache_free(kmem_cache_t *, void *);
66extern unsigned int kmem_cache_size(kmem_cache_t *);
67extern const char *kmem_cache_name(kmem_cache_t *);
68extern kmem_cache_t *kmem_find_general_cachep(size_t size, unsigned int __nocast gfpflags);
69
70/* Size description struct for general caches. */
71struct cache_sizes {
72 size_t cs_size;
73 kmem_cache_t *cs_cachep;
74 kmem_cache_t *cs_dmacachep;
75};
76extern struct cache_sizes malloc_sizes[];
77extern void *__kmalloc(size_t, unsigned int __nocast);
78
79static inline void *kmalloc(size_t size, unsigned int __nocast flags)
80{
81 if (__builtin_constant_p(size)) {
82 int i = 0;
83#define CACHE(x) \
84 if (size <= x) \
85 goto found; \
86 else \
87 i++;
88#include "kmalloc_sizes.h"
89#undef CACHE
90 {
91 extern void __you_cannot_kmalloc_that_much(void);
92 __you_cannot_kmalloc_that_much();
93 }
94found:
95 return kmem_cache_alloc((flags & GFP_DMA) ?
96 malloc_sizes[i].cs_dmacachep :
97 malloc_sizes[i].cs_cachep, flags);
98 }
99 return __kmalloc(size, flags);
100}
101
102extern void *kcalloc(size_t, size_t, unsigned int __nocast);
103extern void kfree(const void *);
104extern unsigned int ksize(const void *);
105
106#ifdef CONFIG_NUMA
107extern void *kmem_cache_alloc_node(kmem_cache_t *, int flags, int node);
108extern void *kmalloc_node(size_t size, unsigned int __nocast flags, int node);
109#else
110static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, int flags, int node)
111{
112 return kmem_cache_alloc(cachep, flags);
113}
114static inline void *kmalloc_node(size_t size, unsigned int __nocast flags, int node)
115{
116 return kmalloc(size, flags);
117}
118#endif
119
120extern int FASTCALL(kmem_cache_reap(int));
121extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
122
123/* System wide caches */
124extern kmem_cache_t *vm_area_cachep;
125extern kmem_cache_t *names_cachep;
126extern kmem_cache_t *files_cachep;
127extern kmem_cache_t *filp_cachep;
128extern kmem_cache_t *fs_cachep;
129extern kmem_cache_t *signal_cachep;
130extern kmem_cache_t *sighand_cachep;
131extern kmem_cache_t *bio_cachep;
132
133extern atomic_t slab_reclaim_pages;
134
135#endif /* __KERNEL__ */
136
137#endif /* _LINUX_SLAB_H */