md/raid5: use kmem_cache_zalloc()

Replace kmem_cache_alloc + memset(,0,) to kmem_cache_zalloc.
I think it's not harmful since @conf->slab_cache already knows
actual size of struct stripe_head.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 3 insertions, 5 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index b72edf35ec54..0f71aa9a07c5 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1315,10 +1315,10 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
 static int grow_one_stripe(raid5_conf_t *conf)
 {
         struct stripe_head *sh;
-        sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL);
+        sh = kmem_cache_zalloc(conf->slab_cache, GFP_KERNEL);
         if (!sh)
                 return 0;
-        memset(sh, 0, sizeof(*sh) + (conf->pool_size-1)*sizeof(struct r5dev));
+
         sh->raid_conf = conf;
         spin_lock_init(&sh->lock);
         #ifdef CONFIG_MULTICORE_RAID456
@@ -1435,12 +1435,10 @@ static int resize_stripes(raid5_conf_t *conf, int newsize)
                 return -ENOMEM;
 
         for (i = conf->max_nr_stripes; i; i--) {
-                nsh = kmem_cache_alloc(sc, GFP_KERNEL);
+                nsh = kmem_cache_zalloc(sc, GFP_KERNEL);
                 if (!nsh)
                         break;
 
-                memset(nsh, 0, sizeof(*nsh) + (newsize-1)*sizeof(struct r5dev));
-
                 nsh->raid_conf = conf;
                 spin_lock_init(&nsh->lock);
                 #ifdef CONFIG_MULTICORE_RAID456