[linux.git] / include / linux / slab.h

/*
 * Written by Mark Hemment, 1996 ([email protected]).
 *
 * (C) SGI 2006, Christoph Lameter
 * 	Cleaned up and restructured to ease the addition of alternative
 * 	implementations of SLAB allocators.
 */

#ifndef _LINUX_SLAB_H
#define	_LINUX_SLAB_H

#include <linux/gfp.h>
#include <linux/types.h>

/*
 * Flags to pass to kmem_cache_create().
 * The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set.
 */
#define SLAB_DEBUG_FREE		0x00000100UL	/* DEBUG: Perform (expensive) checks on free */
#define SLAB_RED_ZONE		0x00000400UL	/* DEBUG: Red zone objs in a cache */
#define SLAB_POISON		0x00000800UL	/* DEBUG: Poison objects */
#define SLAB_HWCACHE_ALIGN	0x00002000UL	/* Align objs on cache lines */
#define SLAB_CACHE_DMA		0x00004000UL	/* Use GFP_DMA memory */
#define SLAB_STORE_USER		0x00010000UL	/* DEBUG: Store the last owner for bug hunting */
#define SLAB_PANIC		0x00040000UL	/* Panic if kmem_cache_create() fails */
/*
 * SLAB_DESTROY_BY_RCU - **WARNING** READ THIS!
 *
 * This delays freeing the SLAB page by a grace period, it does _NOT_
 * delay object freeing. This means that if you do kmem_cache_free()
 * that memory location is free to be reused at any time. Thus it may
 * be possible to see another object there in the same RCU grace period.
 *
 * This feature only ensures the memory location backing the object
 * stays valid, the trick to using this is relying on an independent
 * object validation pass. Something like:
 *
 *  rcu_read_lock()
 * again:
 *  obj = lockless_lookup(key);
 *  if (obj) {
 *    if (!try_get_ref(obj)) // might fail for free objects
 *      goto again;
 *
 *    if (obj->key != key) { // not the object we expected
 *      put_ref(obj);
 *      goto again;
 *    }
 *  }
 *  rcu_read_unlock();
 *
 * See also the comment on struct slab_rcu in mm/slab.c.
 */
#define SLAB_DESTROY_BY_RCU	0x00080000UL	/* Defer freeing slabs to RCU */
#define SLAB_MEM_SPREAD		0x00100000UL	/* Spread some memory over cpuset */
#define SLAB_TRACE		0x00200000UL	/* Trace allocations and frees */

/* Flag to prevent checks on free */
#ifdef CONFIG_DEBUG_OBJECTS
# define SLAB_DEBUG_OBJECTS	0x00400000UL
#else
# define SLAB_DEBUG_OBJECTS	0x00000000UL
#endif

#define SLAB_NOLEAKTRACE	0x00800000UL	/* Avoid kmemleak tracing */

/* Don't track use of uninitialized memory */
#ifdef CONFIG_KMEMCHECK
# define SLAB_NOTRACK		0x01000000UL
#else
# define SLAB_NOTRACK		0x00000000UL
#endif
#ifdef CONFIG_FAILSLAB
# define SLAB_FAILSLAB		0x02000000UL	/* Fault injection mark */
#else
# define SLAB_FAILSLAB		0x00000000UL
#endif

/* The following flags affect the page allocator grouping pages by mobility */
#define SLAB_RECLAIM_ACCOUNT	0x00020000UL		/* Objects are reclaimable */
#define SLAB_TEMPORARY		SLAB_RECLAIM_ACCOUNT	/* Objects are short-lived */
/*
 * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.
 *
 * Dereferencing ZERO_SIZE_PTR will lead to a distinct access fault.
 *
 * ZERO_SIZE_PTR can be passed to kfree though in the same way that NULL can.
 * Both make kfree a no-op.
 */
#define ZERO_SIZE_PTR ((void *)16)

#define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) <= \
				(unsigned long)ZERO_SIZE_PTR)

/*
 * struct kmem_cache related prototypes
 */
void __init kmem_cache_init(void);
int slab_is_available(void);

struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
			unsigned long,
			void (*)(void *));
void kmem_cache_destroy(struct kmem_cache *);
int kmem_cache_shrink(struct kmem_cache *);
void kmem_cache_free(struct kmem_cache *, void *);
unsigned int kmem_cache_size(struct kmem_cache *);
const char *kmem_cache_name(struct kmem_cache *);

/*
 * Please use this macro to create slab caches. Simply specify the
 * name of the structure and maybe some flags that are listed above.
 *
 * The alignment of the struct determines object alignment. If you
 * f.e. add ____cacheline_aligned_in_smp to the struct declaration
 * then the objects will be properly aligned in SMP configurations.
 */
#define KMEM_CACHE(__struct, __flags) kmem_cache_create(#__struct,\
		sizeof(struct __struct), __alignof__(struct __struct),\
		(__flags), NULL)

/*
 * The largest kmalloc size supported by the slab allocators is
 * 32 megabyte (2^25) or the maximum allocatable page order if that is
 * less than 32 MB.
 *
 * WARNING: Its not easy to increase this value since the allocators have
 * to do various tricks to work around compiler limitations in order to
 * ensure proper constant folding.
 */
#define KMALLOC_SHIFT_HIGH	((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \
				(MAX_ORDER + PAGE_SHIFT - 1) : 25)

#define KMALLOC_MAX_SIZE	(1UL << KMALLOC_SHIFT_HIGH)
#define KMALLOC_MAX_ORDER	(KMALLOC_SHIFT_HIGH - PAGE_SHIFT)

/*
 * Common kmalloc functions provided by all allocators
 */
void * __must_check __krealloc(const void *, size_t, gfp_t);
void * __must_check krealloc(const void *, size_t, gfp_t);
void kfree(const void *);
void kzfree(const void *);
size_t ksize(const void *);

/*
 * Allocator specific definitions. These are mainly used to establish optimized
 * ways to convert kmalloc() calls to kmem_cache_alloc() invocations by
 * selecting the appropriate general cache at compile time.
 *
 * Allocators must define at least:
 *
 *	kmem_cache_alloc()
 *	__kmalloc()
 *	kmalloc()
 *
 * Those wishing to support NUMA must also define:
 *
 *	kmem_cache_alloc_node()
 *	kmalloc_node()
 *
 * See each allocator definition file for additional comments and
 * implementation notes.
 */
#ifdef CONFIG_SLUB
#include <linux/slub_def.h>
#elif defined(CONFIG_SLOB)
#include <linux/slob_def.h>
#else
#include <linux/slab_def.h>
#endif

/**
 * 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.
 *
 * The @flags argument may be one of:
 *
 * %GFP_USER - Allocate memory on behalf of user.  May sleep.
 *
 * %GFP_KERNEL - Allocate normal kernel ram.  May sleep.
 *
 * %GFP_ATOMIC - Allocation will not sleep.  May use emergency pools.
 *   For example, use this inside interrupt handlers.
 *
 * %GFP_HIGHUSER - Allocate pages from high memory.
 *
 * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
 *
 * %GFP_NOFS - Do not make any fs calls while trying to get memory.
 *
 * %GFP_NOWAIT - Allocation will not sleep.
 *
 * %GFP_THISNODE - Allocate node-local memory only.
 *
 * %GFP_DMA - Allocation suitable for DMA.
 *   Should only be used for kmalloc() caches. Otherwise, use a
 *   slab created with SLAB_DMA.
 *
 * Also it is possible to set different flags by OR'ing
 * in one or more of the following additional @flags:
 *
 * %__GFP_COLD - Request cache-cold pages instead of
 *   trying to return cache-warm pages.
 *
 * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
 *
 * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
 *   (think twice before using).
 *
 * %__GFP_NORETRY - If memory is not immediately available,
 *   then give up at once.
 *
 * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
 *
 * %__GFP_REPEAT - If allocation fails initially, try once more before failing.
 *
 * There are other flags available as well, but these are not intended
 * for general use, and so are not documented here. For a full list of
 * potential flags, always refer to linux/gfp.h.
 */
static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
	if (size != 0 && n > ULONG_MAX / size)
		return NULL;
	return __kmalloc(n * size, flags | __GFP_ZERO);
}

#if !defined(CONFIG_NUMA) && !defined(CONFIG_SLOB)
/**
 * kmalloc_node - allocate memory from a specific node
 * @size: how many bytes of memory are required.
 * @flags: the type of memory to allocate (see kcalloc).
 * @node: node to allocate from.
 *
 * kmalloc() for non-local nodes, used to allocate from a specific node
 * if available. Equivalent to kmalloc() in the non-NUMA single-node
 * case.
 */
static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
	return kmalloc(size, flags);
}

static inline void *__kmalloc_node(size_t size, gfp_t flags, int node)
{
	return __kmalloc(size, flags);
}

void *kmem_cache_alloc(struct kmem_cache *, gfp_t);

static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
					gfp_t flags, int node)
{
	return kmem_cache_alloc(cachep, flags);
}
#endif /* !CONFIG_NUMA && !CONFIG_SLOB */

/*
 * kmalloc_track_caller is a special version of kmalloc that records the
 * calling function of the routine calling it for slab leak tracking instead
 * of just the calling function (confusing, eh?).
 * It's useful when the call to kmalloc comes from a widely-used standard
 * allocator where we care about the real place the memory allocation
 * request comes from.
 */
#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || \
	(defined(CONFIG_SLAB) && defined(CONFIG_TRACING))
extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
#define kmalloc_track_caller(size, flags) \
	__kmalloc_track_caller(size, flags, _RET_IP_)
#else
#define kmalloc_track_caller(size, flags) \
	__kmalloc(size, flags)
#endif /* DEBUG_SLAB */

#ifdef CONFIG_NUMA
/*
 * kmalloc_node_track_caller is a special version of kmalloc_node that
 * records the calling function of the routine calling it for slab leak
 * tracking instead of just the calling function (confusing, eh?).
 * It's useful when the call to kmalloc_node comes from a widely-used
 * standard allocator where we care about the real place the memory
 * allocation request comes from.
 */
#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || \
	(defined(CONFIG_SLAB) && defined(CONFIG_TRACING))
extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long);
#define kmalloc_node_track_caller(size, flags, node) \
	__kmalloc_node_track_caller(size, flags, node, \
			_RET_IP_)
#else
#define kmalloc_node_track_caller(size, flags, node) \
	__kmalloc_node(size, flags, node)
#endif

#else /* CONFIG_NUMA */

#define kmalloc_node_track_caller(size, flags, node) \
	kmalloc_track_caller(size, flags)

#endif /* CONFIG_NUMA */

/*
 * Shortcuts
 */
static inline void *kmem_cache_zalloc(struct kmem_cache *k, gfp_t flags)
{
	return kmem_cache_alloc(k, flags | __GFP_ZERO);
}

/**
 * kzalloc - allocate memory. The memory is set to zero.
 * @size: how many bytes of memory are required.
 * @flags: the type of memory to allocate (see kmalloc).
 */
static inline void *kzalloc(size_t size, gfp_t flags)
{
	return kmalloc(size, flags | __GFP_ZERO);
}

/**
 * kzalloc_node - allocate zeroed memory from a particular memory node.
 * @size: how many bytes of memory are required.
 * @flags: the type of memory to allocate (see kmalloc).
 * @node: memory node from which to allocate
 */
static inline void *kzalloc_node(size_t size, gfp_t flags, int node)
{
	return kmalloc_node(size, flags | __GFP_ZERO, node);
}

void __init kmem_cache_init_late(void);

#endif	/* _LINUX_SLAB_H */
Commit	Line	Data
1da177e4	1	/*
2e892f43 CL	2	* Written by Mark Hemment, 1996 ([email protected]).
2e892f43 CL	3	*
cde53535	4	* (C) SGI 2006, Christoph Lameter
2e892f43 CL	5	* Cleaned up and restructured to ease the addition of alternative
2e892f43 CL	6	* implementations of SLAB allocators.
1da177e4 LT	7	*/
	8
	9	#ifndef _LINUX_SLAB_H
	10	#define _LINUX_SLAB_H
	11
1b1cec4b	12	#include <linux/gfp.h>
1b1cec4b	13	#include <linux/types.h>
1da177e4	14
2e892f43 CL	15	/*
	16	* Flags to pass to kmem_cache_create().
	17	* The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set.
1da177e4	18	*/
55935a34	19	#define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */
55935a34 CL	20	#define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */
	21	#define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */
	22	#define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */
2e892f43	23	#define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */
2e892f43	24	#define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */
2e892f43	25	#define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */
d7de4c1d PZ	26	/*
	27	* SLAB_DESTROY_BY_RCU - WARNING READ THIS!
	28	*
	29	* This delays freeing the SLAB page by a grace period, it does _NOT_
	30	* delay object freeing. This means that if you do kmem_cache_free()
	31	* that memory location is free to be reused at any time. Thus it may
	32	* be possible to see another object there in the same RCU grace period.
	33	*
	34	* This feature only ensures the memory location backing the object
	35	* stays valid, the trick to using this is relying on an independent
	36	* object validation pass. Something like:
	37	*
	38	* rcu_read_lock()
	39	* again:
	40	* obj = lockless_lookup(key);
	41	* if (obj) {
	42	* if (!try_get_ref(obj)) // might fail for free objects
	43	* goto again;
	44	*
	45	* if (obj->key != key) { // not the object we expected
	46	* put_ref(obj);
	47	* goto again;
	48	* }
	49	* }
	50	* rcu_read_unlock();
	51	*
	52	* See also the comment on struct slab_rcu in mm/slab.c.
	53	*/
2e892f43	54	#define SLAB_DESTROY_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */
101a5001	55	#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
81819f0f	56	#define SLAB_TRACE 0x00200000UL /* Trace allocations and frees */
1da177e4	57
30327acf TG	58	/* Flag to prevent checks on free */
	59	#ifdef CONFIG_DEBUG_OBJECTS
	60	# define SLAB_DEBUG_OBJECTS 0x00400000UL
	61	#else
	62	# define SLAB_DEBUG_OBJECTS 0x00000000UL
	63	#endif
	64
d5cff635 CM	65	#define SLAB_NOLEAKTRACE 0x00800000UL /* Avoid kmemleak tracing */
d5cff635 CM	66
2dff4405 VN	67	/* Don't track use of uninitialized memory */
	68	#ifdef CONFIG_KMEMCHECK
	69	# define SLAB_NOTRACK 0x01000000UL
	70	#else
	71	# define SLAB_NOTRACK 0x00000000UL
	72	#endif
4c13dd3b DM	73	#ifdef CONFIG_FAILSLAB
	74	# define SLAB_FAILSLAB 0x02000000UL /* Fault injection mark */
	75	#else
	76	# define SLAB_FAILSLAB 0x00000000UL
	77	#endif
2dff4405	78
e12ba74d MG	79	/* The following flags affect the page allocator grouping pages by mobility */
	80	#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */
	81	#define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */
6cb8f913 CL	82	/*
	83	* ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.
	84	*
	85	* Dereferencing ZERO_SIZE_PTR will lead to a distinct access fault.
	86	*
	87	* ZERO_SIZE_PTR can be passed to kfree though in the same way that NULL can.
	88	* Both make kfree a no-op.
	89	*/
	90	#define ZERO_SIZE_PTR ((void *)16)
	91
1d4ec7b1	92	#define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) <= \
6cb8f913 CL	93	(unsigned long)ZERO_SIZE_PTR)
6cb8f913 CL	94
2e892f43 CL	95	/*
	96	* struct kmem_cache related prototypes
	97	*/
	98	void __init kmem_cache_init(void);
81819f0f	99	int slab_is_available(void);
1da177e4	100
2e892f43	101	struct kmem_cache kmem_cache_create(const char , size_t, size_t,
ebe29738	102	unsigned long,
51cc5068	103	void ()(void ));
2e892f43 CL	104	void kmem_cache_destroy(struct kmem_cache *);
2e892f43 CL	105	int kmem_cache_shrink(struct kmem_cache *);
2e892f43 CL	106	void kmem_cache_free(struct kmem_cache , void );
	107	unsigned int kmem_cache_size(struct kmem_cache *);
	108	const char kmem_cache_name(struct kmem_cache );
2e892f43	109
0a31bd5f CL	110	/*
	111	* Please use this macro to create slab caches. Simply specify the
	112	* name of the structure and maybe some flags that are listed above.
	113	*
	114	* The alignment of the struct determines object alignment. If you
	115	* f.e. add ____cacheline_aligned_in_smp to the struct declaration
	116	* then the objects will be properly aligned in SMP configurations.
	117	*/
	118	#define KMEM_CACHE(__struct, __flags) kmem_cache_create(#__struct,\
	119	sizeof(struct __struct), __alignof__(struct __struct),\
20c2df83	120	(__flags), NULL)
0a31bd5f	121
0aa817f0 CL	122	/*
	123	* The largest kmalloc size supported by the slab allocators is
	124	* 32 megabyte (2^25) or the maximum allocatable page order if that is
	125	* less than 32 MB.
	126	*
	127	* WARNING: Its not easy to increase this value since the allocators have
	128	* to do various tricks to work around compiler limitations in order to
	129	* ensure proper constant folding.
	130	*/
debee076 CL	131	#define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \
debee076 CL	132	(MAX_ORDER + PAGE_SHIFT - 1) : 25)
0aa817f0 CL	133
	134	#define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_HIGH)
	135	#define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_HIGH - PAGE_SHIFT)
	136
2e892f43 CL	137	/*
	138	* Common kmalloc functions provided by all allocators
	139	*/
93bc4e89	140	void * __must_check __krealloc(const void *, size_t, gfp_t);
fd76bab2	141	void * __must_check krealloc(const void *, size_t, gfp_t);
2e892f43	142	void kfree(const void *);
3ef0e5ba	143	void kzfree(const void *);
fd76bab2	144	size_t ksize(const void *);
2e892f43	145
81cda662 CL	146	/*
	147	* Allocator specific definitions. These are mainly used to establish optimized
	148	* ways to convert kmalloc() calls to kmem_cache_alloc() invocations by
	149	* selecting the appropriate general cache at compile time.
	150	*
	151	* Allocators must define at least:
	152	*
	153	* kmem_cache_alloc()
	154	* __kmalloc()
	155	* kmalloc()
	156	*
	157	* Those wishing to support NUMA must also define:
	158	*
	159	* kmem_cache_alloc_node()
	160	* kmalloc_node()
	161	*
	162	* See each allocator definition file for additional comments and
	163	* implementation notes.
	164	*/
	165	#ifdef CONFIG_SLUB
	166	#include <linux/slub_def.h>
	167	#elif defined(CONFIG_SLOB)
	168	#include <linux/slob_def.h>
	169	#else
	170	#include <linux/slab_def.h>
	171	#endif
	172
2e892f43 CL	173	/**
	174	* kcalloc - allocate memory for an array. The memory is set to zero.
	175	* @n: number of elements.
	176	* @size: element size.
	177	* @flags: the type of memory to allocate.
800590f5 PD	178	*
	179	* The @flags argument may be one of:
	180	*
	181	* %GFP_USER - Allocate memory on behalf of user. May sleep.
	182	*
	183	* %GFP_KERNEL - Allocate normal kernel ram. May sleep.
	184	*
6193a2ff	185	* %GFP_ATOMIC - Allocation will not sleep. May use emergency pools.
800590f5 PD	186	* For example, use this inside interrupt handlers.
	187	*
	188	* %GFP_HIGHUSER - Allocate pages from high memory.
	189	*
	190	* %GFP_NOIO - Do not do any I/O at all while trying to get memory.
	191	*
	192	* %GFP_NOFS - Do not make any fs calls while trying to get memory.
	193	*
6193a2ff PM	194	* %GFP_NOWAIT - Allocation will not sleep.
	195	*
	196	* %GFP_THISNODE - Allocate node-local memory only.
	197	*
	198	* %GFP_DMA - Allocation suitable for DMA.
	199	* Should only be used for kmalloc() caches. Otherwise, use a
	200	* slab created with SLAB_DMA.
	201	*
800590f5 PD	202	* Also it is possible to set different flags by OR'ing
	203	* in one or more of the following additional @flags:
	204	*
	205	* %__GFP_COLD - Request cache-cold pages instead of
	206	* trying to return cache-warm pages.
	207	*
800590f5 PD	208	* %__GFP_HIGH - This allocation has high priority and may use emergency pools.
800590f5 PD	209	*
800590f5 PD	210	* %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
	211	* (think twice before using).
	212	*
	213	* %__GFP_NORETRY - If memory is not immediately available,
	214	* then give up at once.
	215	*
	216	* %__GFP_NOWARN - If allocation fails, don't issue any warnings.
	217	*
	218	* %__GFP_REPEAT - If allocation fails initially, try once more before failing.
6193a2ff PM	219	*
	220	* There are other flags available as well, but these are not intended
	221	* for general use, and so are not documented here. For a full list of
	222	* potential flags, always refer to linux/gfp.h.
800590f5	223	*/
6193a2ff	224	static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
1da177e4	225	{
9ca908f4	226	if (size != 0 && n > ULONG_MAX / size)
6193a2ff	227	return NULL;
81cda662	228	return __kmalloc(n * size, flags \| __GFP_ZERO);
1da177e4 LT	229	}
1da177e4 LT	230
6193a2ff PM	231	#if !defined(CONFIG_NUMA) && !defined(CONFIG_SLOB)
	232	/**
	233	* kmalloc_node - allocate memory from a specific node
	234	* @size: how many bytes of memory are required.
	235	* @flags: the type of memory to allocate (see kcalloc).
	236	* @node: node to allocate from.
	237	*
	238	* kmalloc() for non-local nodes, used to allocate from a specific node
	239	* if available. Equivalent to kmalloc() in the non-NUMA single-node
	240	* case.
	241	*/
55935a34 CL	242	static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
	243	{
	244	return kmalloc(size, flags);
	245	}
	246
	247	static inline void *__kmalloc_node(size_t size, gfp_t flags, int node)
	248	{
	249	return __kmalloc(size, flags);
	250	}
6193a2ff PM	251
	252	void kmem_cache_alloc(struct kmem_cache , gfp_t);
	253
	254	static inline void kmem_cache_alloc_node(struct kmem_cache cachep,
	255	gfp_t flags, int node)
	256	{
	257	return kmem_cache_alloc(cachep, flags);
	258	}
	259	#endif /* !CONFIG_NUMA && !CONFIG_SLOB */
55935a34	260
1d2c8eea CH	261	/*
	262	* kmalloc_track_caller is a special version of kmalloc that records the
	263	* calling function of the routine calling it for slab leak tracking instead
	264	* of just the calling function (confusing, eh?).
	265	* It's useful when the call to kmalloc comes from a widely-used standard
	266	* allocator where we care about the real place the memory allocation
	267	* request comes from.
	268	*/
7adde04a XF	269	#if defined(CONFIG_DEBUG_SLAB) \|\| defined(CONFIG_SLUB) \|\| \
7adde04a XF	270	(defined(CONFIG_SLAB) && defined(CONFIG_TRACING))
ce71e27c	271	extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
1d2c8eea	272	#define kmalloc_track_caller(size, flags) \
ce71e27c	273	__kmalloc_track_caller(size, flags, _RET_IP_)
2e892f43 CL	274	#else
	275	#define kmalloc_track_caller(size, flags) \
	276	__kmalloc(size, flags)
	277	#endif /* DEBUG_SLAB */
1da177e4	278
97e2bde4	279	#ifdef CONFIG_NUMA
8b98c169 CH	280	/*
	281	* kmalloc_node_track_caller is a special version of kmalloc_node that
	282	* records the calling function of the routine calling it for slab leak
	283	* tracking instead of just the calling function (confusing, eh?).
	284	* It's useful when the call to kmalloc_node comes from a widely-used
	285	* standard allocator where we care about the real place the memory
	286	* allocation request comes from.
	287	*/
7adde04a XF	288	#if defined(CONFIG_DEBUG_SLAB) \|\| defined(CONFIG_SLUB) \|\| \
7adde04a XF	289	(defined(CONFIG_SLAB) && defined(CONFIG_TRACING))
ce71e27c	290	extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long);
8b98c169 CH	291	#define kmalloc_node_track_caller(size, flags, node) \
8b98c169 CH	292	__kmalloc_node_track_caller(size, flags, node, \
ce71e27c	293	_RET_IP_)
2e892f43 CL	294	#else
	295	#define kmalloc_node_track_caller(size, flags, node) \
	296	__kmalloc_node(size, flags, node)
8b98c169	297	#endif
2e892f43	298
8b98c169	299	#else /* CONFIG_NUMA */
8b98c169 CH	300
	301	#define kmalloc_node_track_caller(size, flags, node) \
	302	kmalloc_track_caller(size, flags)
97e2bde4	303
dfcd3610	304	#endif /* CONFIG_NUMA */
10cef602	305
81cda662 CL	306	/*
	307	* Shortcuts
	308	*/
	309	static inline void kmem_cache_zalloc(struct kmem_cache k, gfp_t flags)
	310	{
	311	return kmem_cache_alloc(k, flags \| __GFP_ZERO);
	312	}
	313
	314	/**
	315	* kzalloc - allocate memory. The memory is set to zero.
	316	* @size: how many bytes of memory are required.
	317	* @flags: the type of memory to allocate (see kmalloc).
	318	*/
	319	static inline void *kzalloc(size_t size, gfp_t flags)
	320	{
	321	return kmalloc(size, flags \| __GFP_ZERO);
	322	}
	323
979b0fea JL	324	/**
	325	* kzalloc_node - allocate zeroed memory from a particular memory node.
	326	* @size: how many bytes of memory are required.
	327	* @flags: the type of memory to allocate (see kmalloc).
	328	* @node: memory node from which to allocate
	329	*/
	330	static inline void *kzalloc_node(size_t size, gfp_t flags, int node)
	331	{
	332	return kmalloc_node(size, flags \| __GFP_ZERO, node);
	333	}
	334
7e85ee0c PE	335	void __init kmem_cache_init_late(void);
7e85ee0c PE	336
1da177e4	337	#endif /* _LINUX_SLAB_H */