[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>

1 files changed, 17 insertions, 0 deletions

diff --git a/mm/slab.c b/mm/slab.c
index a5047161084..6f5aeebd430 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