static int call_netdevice_notifiers_info(unsigned long val,
 					 struct netdev_notifier_info *info)
 {
+	struct net *net = dev_net(info->dev);
+	int ret;
+
 	ASSERT_RTNL();
+
+	/* Run per-netns notifier block chain first, then run the global one.
+	 * Hopefully, one day, the global one is going to be removed after
+	 * all notifier block registrators get converted to be per-netns.
+	 */

Hi Jiri

Is that really going to happen? register_netdevice_notifier() is used
in 130 files. Do you plan to spend the time to make it happen?

+	ret = raw_notifier_call_chain(&net->netdev_chain, val, info);
+	if (ret & NOTIFY_STOP_MASK)
+		return ret;
 	return raw_notifier_call_chain(&netdev_chain, val, info);
 }

Humm. I wonder about NOTIFY_STOP_MASK here. These are two separate
chains. Should one chain be able to stop the other chain? Are there
other examples where NOTIFY_STOP_MASK crosses a chain boundary?

      Andrew