GFS2: use memchr_inv

Use memchr_inv to verify that the specified memory range is cleared.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: cluster-devel@redhat.com
Cc: Christine Caulfield <ccaulfie@redhat.com>
Cc: David Teigland <teigland@redhat.com>

diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c
index b15bb45911ca84e1e3ef1dc7d03ad0f27d3f49d8..c8423d6de6c3ee54341d5ea5c4eb7e20ca7255de 100644 (file)
--- a/fs/gfs2/lock_dlm.c
+++ b/fs/gfs2/lock_dlm.c
@@ -483,12 +483,8 @@ static void control_lvb_write(struct lm_lockstruct *ls, uint32_t lvb_gen,
 
 static int all_jid_bits_clear(char *lvb)
 {
-       int i;
-       for (i = JID_BITMAP_OFFSET; i < GDLM_LVB_SIZE; i++) {
-               if (lvb[i])
-                       return 0;
-       }
-       return 1;
+       return !memchr_inv(lvb + JID_BITMAP_OFFSET, 0,
+                       GDLM_LVB_SIZE - JID_BITMAP_OFFSET);
 }
 
 static void sync_wait_cb(void *arg)