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

[Andrew Morton]

On Thu, 17 May 2012 13:52:13 +0400 Glauber Costa <glommer at parallels.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);