From: Pekka Enberg <[email protected]>
This patch introduces 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 <[email protected]>
---
include/linux/slab.h | 2 ++
mm/slab.c | 17 +++++++++++++++++
mm/slob.c | 10 ++++++++++
3 files changed, 29 insertions(+), 0 deletions(-)
7ebeed21971a6a24749a4966db1ccc69c6806e15
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 8cf5293..b595c09 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -64,6 +64,7 @@ extern kmem_cache_t *kmem_cache_create(c
extern int kmem_cache_destroy(kmem_cache_t *);
extern int kmem_cache_shrink(kmem_cache_t *);
extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
+extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
extern void kmem_cache_free(kmem_cache_t *, void *);
extern unsigned int kmem_cache_size(kmem_cache_t *);
extern const char *kmem_cache_name(kmem_cache_t *);
@@ -155,6 +156,7 @@ struct kmem_cache *kmem_cache_create(con
void (*)(void *, struct kmem_cache *, unsigned long));
int kmem_cache_destroy(struct kmem_cache *c);
void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
+void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
void kmem_cache_free(struct kmem_cache *c, void *b);
const char *kmem_cache_name(struct kmem_cache *);
void *kmalloc(size_t size, gfp_t flags);
diff --git a/mm/slab.c b/mm/slab.c
index d0bd7f0..5f3e14b 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3056,6 +3056,23 @@ void *kmem_cache_alloc(struct kmem_cache
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 a1f42bd..9bcc7e2 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -294,6 +294,16 @@ void *kmem_cache_alloc(struct kmem_cache
}
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)
--
1.2.3
-
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