netdev - Re: [PATCH v5 2/2] decrement static keys on real destroy time

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Date:	Thu, 17 May 2012 10:02:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	<cgroups@...r.kernel.org>, <linux-mm@...ck.org>,
	<devel@...nvz.org>, <kamezawa.hiroyu@...fujitsu.com>,
	<netdev@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH v5 2/2] decrement static keys on real destroy time

On Thu, 17 May 2012 13:52:13 +0400 Glauber Costa <glommer@...allels.com> wrote:

> Andrew is right. It seems we will need that mutex after all. Just this 
> is not a race, and neither something that should belong in the 
> static_branch interface.

Well, a mutex is one way.  Or you could do something like

	if (!test_and_set_bit(CGPROTO_ACTIVATED, &cg_proto->flags))
		static_key_slow_inc(&memcg_socket_limit_enabled);
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