[PATCH] jbd: use kmem_cache_zalloc instead of kmem_cache_alloc/memset

[Zheng Liu <gnehzuil.liu@gmail.com>]

From: Zheng Liu <wenqing.lz@taobao.com>

Now jbd_alloc_handle is only called by new_handle.  So this commit
uses kmem_cache_zalloc instead of kmem_cache_alloc/memset.

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
---
 fs/jbd/transaction.c | 1 -
 include/linux/jbd.h  | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index 071d690..e3e255c 100644
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -245,7 +245,6 @@ static handle_t *new_handle(int nblocks)
 	handle_t *handle = jbd_alloc_handle(GFP_NOFS);
 	if (!handle)
 		return NULL;
-	memset(handle, 0, sizeof(*handle));
 	handle->h_buffer_credits = nblocks;
 	handle->h_ref = 1;
 
diff --git a/include/linux/jbd.h b/include/linux/jbd.h
index c8f3297..7e0b622 100644
--- a/include/linux/jbd.h
+++ b/include/linux/jbd.h
@@ -887,7 +887,7 @@ extern struct kmem_cache *jbd_handle_cache;
 
 static inline handle_t *jbd_alloc_handle(gfp_t gfp_flags)
 {
-	return kmem_cache_alloc(jbd_handle_cache, gfp_flags);
+	return kmem_cache_zalloc(jbd_handle_cache, gfp_flags);
 }
 
 static inline void jbd_free_handle(handle_t *handle)
-- 
1.7.12.rc2.18.g61b472e