linux-kernel - Re: [PATCH 2/3] sched: fix static keys race in sched

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Date:	Fri, 28 Jun 2013 23:03:28 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	jbaron@...mai.com
Cc:	andi@...stfloor.org, linux-kernel@...r.kernel.org,
	mingo@...nel.org, peterz@...radead.org
Subject: Re: [PATCH 2/3] sched: fix static keys race in sched_feat

On Fri, 2013-06-28 at 22:30 +0000, jbaron@...mai.com wrote:
> As pointed out by Andi Kleen, thue usage of static keys can be racy in

"thue"

> sched_feat_disable vs. sched_feat_enable(). Currently, we first check the
> value of keys->enabled, and subsequently update the branch direction. This,
> can be racy and can potentially leave the keys in an inconsistent state.
> 
> Fix the race by using static_key_slow_set_true()/false(), which does the the
> check and set using the jump_label_mutex.
> 
> Signed-off-by: Jason Baron <jbaron@...mai.com>

-- Steve


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