提交 81cda662 编写于 作者: C Christoph Lameter 提交者: Linus Torvalds

Slab allocators: Cleanup zeroing allocations

It becomes now easy to support the zeroing allocs with generic inline
functions in slab.h.  Provide inline definitions to allow the continued use of
kzalloc, kmem_cache_zalloc etc but remove other definitions of zeroing
functions from the slab allocators and util.c.
Signed-off-by: NChristoph Lameter <clameter@sgi.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 ce15fea8
......@@ -55,7 +55,6 @@ struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
void (*)(void *, struct kmem_cache *, unsigned long));
void kmem_cache_destroy(struct kmem_cache *);
int kmem_cache_shrink(struct kmem_cache *);
void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
void kmem_cache_free(struct kmem_cache *, void *);
unsigned int kmem_cache_size(struct kmem_cache *);
const char *kmem_cache_name(struct kmem_cache *);
......@@ -91,11 +90,37 @@ int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr);
/*
* Common kmalloc functions provided by all allocators
*/
void *__kzalloc(size_t, gfp_t);
void * __must_check krealloc(const void *, size_t, gfp_t);
void kfree(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.
......@@ -151,37 +176,9 @@ static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
if (n != 0 && size > ULONG_MAX / n)
return NULL;
return __kzalloc(n * size, flags);
return __kmalloc(n * size, flags | __GFP_ZERO);
}
/*
* 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()
* kzalloc()
*
* 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
#if !defined(CONFIG_NUMA) && !defined(CONFIG_SLOB)
/**
* kmalloc_node - allocate memory from a specific node
......@@ -255,5 +252,23 @@ extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *);
#endif /* DEBUG_SLAB */
/*
* 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);
}
#endif /* __KERNEL__ */
#endif /* _LINUX_SLAB_H */
......@@ -58,36 +58,6 @@ static inline void *kmalloc(size_t size, gfp_t flags)
return __kmalloc(size, flags);
}
static inline void *kzalloc(size_t size, gfp_t flags)
{
if (__builtin_constant_p(size)) {
int i = 0;
if (!size)
return ZERO_SIZE_PTR;
#define CACHE(x) \
if (size <= x) \
goto found; \
else \
i++;
#include "kmalloc_sizes.h"
#undef CACHE
{
extern void __you_cannot_kzalloc_that_much(void);
__you_cannot_kzalloc_that_much();
}
found:
#ifdef CONFIG_ZONE_DMA
if (flags & GFP_DMA)
return kmem_cache_zalloc(malloc_sizes[i].cs_dmacachep,
flags);
#endif
return kmem_cache_zalloc(malloc_sizes[i].cs_cachep, flags);
}
return __kzalloc(size, flags);
}
#ifdef CONFIG_NUMA
extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
......
......@@ -179,19 +179,6 @@ static inline void *kmalloc(size_t size, gfp_t flags)
return __kmalloc(size, flags);
}
static inline void *kzalloc(size_t size, gfp_t flags)
{
if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
struct kmem_cache *s = kmalloc_slab(size);
if (!s)
return ZERO_SIZE_PTR;
return kmem_cache_zalloc(s, flags);
} else
return __kzalloc(size, flags);
}
#ifdef CONFIG_NUMA
void *__kmalloc_node(size_t size, gfp_t flags, int node);
void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
......
......@@ -3589,23 +3589,6 @@ void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
}
EXPORT_SYMBOL(kmem_cache_alloc);
/**
* kmem_cache_zalloc - Allocate an object. The memory is set to zero.
* @cache: The cache to allocate from.
* @flags: See kmalloc().
*
* Allocate an object from this cache and set the allocated memory to zero.
* The flags are only relevant if the cache has no available objects.
*/
void *kmem_cache_zalloc(struct kmem_cache *cache, gfp_t flags)
{
void *ret = __cache_alloc(cache, flags, __builtin_return_address(0));
if (ret)
memset(ret, 0, obj_size(cache));
return ret;
}
EXPORT_SYMBOL(kmem_cache_zalloc);
/**
* kmem_ptr_validate - check if an untrusted pointer might
* be a slab entry.
......
......@@ -543,16 +543,6 @@ void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
}
EXPORT_SYMBOL(kmem_cache_alloc_node);
void *kmem_cache_zalloc(struct kmem_cache *c, gfp_t flags)
{
void *ret = kmem_cache_alloc(c, flags);
if (ret)
memset(ret, 0, c->size);
return ret;
}
EXPORT_SYMBOL(kmem_cache_zalloc);
static void __kmem_cache_free(void *b, int size)
{
if (size < PAGE_SIZE)
......
......@@ -2706,17 +2706,6 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
}
EXPORT_SYMBOL(kmem_cache_create);
void *kmem_cache_zalloc(struct kmem_cache *s, gfp_t flags)
{
void *x;
x = slab_alloc(s, flags, -1, __builtin_return_address(0));
if (x)
memset(x, 0, s->objsize);
return x;
}
EXPORT_SYMBOL(kmem_cache_zalloc);
#ifdef CONFIG_SMP
/*
* Use the cpu notifier to insure that the cpu slabs are flushed when
......
......@@ -5,20 +5,6 @@
#include <asm/uaccess.h>
/**
* __kzalloc - allocate memory. The memory is set to zero.
* @size: how many bytes of memory are required.
* @flags: the type of memory to allocate.
*/
void *__kzalloc(size_t size, gfp_t flags)
{
void *ret = kmalloc_track_caller(size, flags);
if (ret)
memset(ret, 0, size);
return ret;
}
EXPORT_SYMBOL(__kzalloc);
/*
* kstrdup - allocate space for and copy an existing string
*
* @s: the string to duplicate
......
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