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>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index b72edf3..0f71aa9 100644 (file)
--- 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