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/*
* linux/mm/slab.h
* Written by Mark Hemment, 1996.
* (markhe@nextd.demon.co.uk)
*/
#ifndef _LINUX_SLAB_H
#define _LINUX_SLAB_H
#if defined(__KERNEL__)
typedef struct kmem_cache_s kmem_cache_t;
#include <linux/config.h> /* kmalloc_sizes.h needs CONFIG_ options */
#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/types.h>
#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
/* flags for kmem_cache_alloc() */
#define SLAB_NOFS GFP_NOFS
#define SLAB_NOIO GFP_NOIO
#define SLAB_ATOMIC GFP_ATOMIC
#define SLAB_USER GFP_USER
#define SLAB_KERNEL GFP_KERNEL
#define SLAB_DMA GFP_DMA
#define SLAB_LEVEL_MASK GFP_LEVEL_MASK
#define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */
/* flags to pass to kmem_cache_create().
* The first 3 are only valid when the allocator as been build
* SLAB_DEBUG_SUPPORT.
*/
#define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
#define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
#define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
#define SLAB_POISON 0x00000800UL /* Poison objects */
#define SLAB_NO_REAP 0x00001000UL /* never reap from the cache */
#define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
#define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
#define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
what is reclaimable later*/
#define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
#define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
/* flags passed to a constructor func */
#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
#define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
#define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
/* prototypes */
extern void __init kmem_cache_init(void);
extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
void (*)(void *, kmem_cache_t *, unsigned long),
void (*)(void *, kmem_cache_t *, unsigned long));
extern int kmem_cache_destroy(kmem_cache_t *);
extern int kmem_cache_shrink(kmem_cache_t *);
extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
extern void kmem_cache_free(kmem_cache_t *, void *);
extern unsigned int kmem_cache_size(kmem_cache_t *);
extern const char *kmem_cache_name(kmem_cache_t *);
extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);
/* Size description struct for general caches. */
struct cache_sizes {
size_t cs_size;
kmem_cache_t *cs_cachep;
kmem_cache_t *cs_dmacachep;
};
extern struct cache_sizes malloc_sizes[];
extern void *__kmalloc(size_t, gfp_t);
static inline void *kmalloc(size_t size, gfp_t flags)
{
if (__builtin_constant_p(size)) {
int i = 0;
#define CACHE(x) \
if (size <= x) \
goto found; \
else \
i++;
#include "kmalloc_sizes.h"
#undef CACHE
{
extern void __you_cannot_kmalloc_that_much(void);
__you_cannot_kmalloc_that_much();
}
found:
return kmem_cache_alloc((flags & GFP_DMA) ?
malloc_sizes[i].cs_dmacachep :
malloc_sizes[i].cs_cachep, flags);
}
return __kmalloc(size, flags);
}
extern void *kzalloc(size_t, gfp_t);
/**
* kcalloc - allocate memory for an array. The memory is set to zero.
* @n: number of elements.
* @size: element size.
* @flags: the type of memory to allocate.
*/
static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
if (n != 0 && size > INT_MAX / n)
return NULL;
return kzalloc(n * size, flags);
}
extern void kfree(const void *);
extern unsigned int ksize(const void *);
#ifdef CONFIG_NUMA
extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
extern void *kmalloc_node(size_t size, gfp_t flags, int node);
#else
static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
{
return kmem_cache_alloc(cachep, flags);
}
static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
return kmalloc(size, flags);
}
#endif
extern int FASTCALL(kmem_cache_reap(int));
extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
/* System wide caches */
extern kmem_cache_t *vm_area_cachep;
extern kmem_cache_t *names_cachep;
extern kmem_cache_t *files_cachep;
extern kmem_cache_t *filp_cachep;
extern kmem_cache_t *fs_cachep;
extern kmem_cache_t *signal_cachep;
extern kmem_cache_t *sighand_cachep;
extern kmem_cache_t *bio_cachep;
extern atomic_t slab_reclaim_pages;
#endif /* __KERNEL__ */
#endif /* _LINUX_SLAB_H */
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