From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net v2] rtnetlink: wait for unregistering devices in
 rtnl_link_unregister()
Date: Thu, 15 May 2014 14:32:42 -0400 (EDT)
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From: Cong Wang <xiyou.wangcong@gmail.com>
Date: Mon, 12 May 2014 15:11:20 -0700

> +static void rtnl_lock_unregistering_all(void)

This is just:

	rtnl_lock_unregistering(&net_namespace_list);

There is no need to reimplement the entire thing.