diff options
| author | Pekka Enberg <penberg@cs.helsinki.fi> | 2006-03-25 03:06:42 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-25 08:22:49 -0800 |
| commit | a8c0f9a41f88da703ade33f9c1626a55c786e8bb (patch) | |
| tree | 8c2904597c61b873bfd85eed4ac196dd66e6f125 /mm | |
| parent | 871751e25d956ad24f129ca972b7851feaa61d53 (diff) | |
| download | linux-a8c0f9a41f88da703ade33f9c1626a55c786e8bb.tar.bz2 | |
[PATCH] slab: introduce kmem_cache_zalloc allocator
Introduce a memory-zeroing variant of kmem_cache_alloc. The allocator
already exits in XFS and there are potential users for it so this patch
makes the allocator available for the general public.
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/slab.c | 17 | ||||
| -rw-r--r-- | mm/slob.c | 10 |
2 files changed, 27 insertions, 0 deletions
diff --git a/mm/slab.c b/mm/slab.c index a5047161084e..6f5aeebd4306 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3108,6 +3108,23 @@ void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) EXPORT_SYMBOL(kmem_cache_alloc); /** + * kmem_cache_alloc - 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. * @cachep: the cache we're checking against diff --git a/mm/slob.c b/mm/slob.c index a1f42bdc0245..9bcc7e2cabfd 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -294,6 +294,16 @@ void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags) } EXPORT_SYMBOL(kmem_cache_alloc); +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); + void kmem_cache_free(struct kmem_cache *c, void *b) { if (c->dtor) |