[mirror_ubuntu-zesty-kernel.git] / include / linux / slab.h

/*
 * 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 *, unsigned int __nocast);
#ifdef CONFIG_NUMA
extern void *kmem_cache_alloc_node(kmem_cache_t *, int);
#else
static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, int node)
{
	return kmem_cache_alloc(cachep, GFP_KERNEL);
}
#endif
extern void kmem_cache_free(kmem_cache_t *, void *);
extern unsigned int kmem_cache_size(kmem_cache_t *);

/* 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, unsigned int __nocast);

static inline void *kmalloc(size_t size, unsigned int __nocast 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 *kcalloc(size_t, size_t, unsigned int __nocast);
extern void kfree(const void *);
extern unsigned int ksize(const void *);

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 */
Commit	Line	Data
1da177e4 LT	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_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 */
	57	extern void __init kmem_cache_init(void);
	58
	59	extern 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));
	62	extern int kmem_cache_destroy(kmem_cache_t *);
	63	extern int kmem_cache_shrink(kmem_cache_t *);
	64	extern void kmem_cache_alloc(kmem_cache_t , unsigned int __nocast);
65	#ifdef CONFIG_NUMA
66	extern void kmem_cache_alloc_node(kmem_cache_t , int);
67	#else
68	static inline void kmem_cache_alloc_node(kmem_cache_t cachep, int node)
69	{
70	return kmem_cache_alloc(cachep, GFP_KERNEL);
71	}
72	#endif
73	extern void kmem_cache_free(kmem_cache_t , void );
74	extern unsigned int kmem_cache_size(kmem_cache_t *);
75
76	/* Size description struct for general caches. */
77	struct cache_sizes {
78	size_t cs_size;
79	kmem_cache_t *cs_cachep;
80	kmem_cache_t *cs_dmacachep;
81	};
82	extern struct cache_sizes malloc_sizes[];
83	extern void *__kmalloc(size_t, unsigned int __nocast);
84
85	static inline void *kmalloc(size_t size, unsigned int __nocast flags)
86	{
87	if (__builtin_constant_p(size)) {
88	int i = 0;
89	#define CACHE(x) \
90	if (size <= x) \
91	goto found; \
92	else \
93	i++;
94	#include "kmalloc_sizes.h"
95	#undef CACHE
96	{
97	extern void __you_cannot_kmalloc_that_much(void);
98	__you_cannot_kmalloc_that_much();
99	}
100	found:
101	return kmem_cache_alloc((flags & GFP_DMA) ?
102	malloc_sizes[i].cs_dmacachep :
103	malloc_sizes[i].cs_cachep, flags);
104	}
105	return __kmalloc(size, flags);
106	}
107
108	extern void *kcalloc(size_t, size_t, unsigned int __nocast);
109	extern void kfree(const void *);
110	extern unsigned int ksize(const void *);
111
112	extern int FASTCALL(kmem_cache_reap(int));
113	extern int FASTCALL(kmem_ptr_validate(kmem_cache_t cachep, void ptr));
114
115	/* System wide caches */
116	extern kmem_cache_t *vm_area_cachep;
117	extern kmem_cache_t *names_cachep;
118	extern kmem_cache_t *files_cachep;
119	extern kmem_cache_t *filp_cachep;
120	extern kmem_cache_t *fs_cachep;
121	extern kmem_cache_t *signal_cachep;
122	extern kmem_cache_t *sighand_cachep;
123	extern kmem_cache_t *bio_cachep;
124
125	extern atomic_t slab_reclaim_pages;
126
127	#endif /* __KERNEL__ */
128
129	#endif /* _LINUX_SLAB_H */