macvlan,rcu: convert call_rcu(macvlan_port_rcu_free) to kfree_rcu()

The rcu callback macvlan_port_rcu_free() just calls a kfree(),
so we use kfree_rcu() instead of the call_rcu(macvlan_port_rcu_free).
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

drivers/net/macvlan.c

@@ -603,21 +603,13 @@ static int macvlan_port_create(struct net_device *dev)
 	return err;
 }
 
-static void macvlan_port_rcu_free(struct rcu_head *head)
-{
-	struct macvlan_port *port;
-
-	port = container_of(head, struct macvlan_port, rcu);
-	kfree(port);
-}
-
 static void macvlan_port_destroy(struct net_device *dev)
 {
 	struct macvlan_port *port = macvlan_port_get(dev);
 
 	dev->priv_flags &= ~IFF_MACVLAN_PORT;
 	netdev_rx_handler_unregister(dev);
-	call_rcu(&port->rcu, macvlan_port_rcu_free);
+	kfree_rcu(port, rcu);
 }
 
 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])