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SubjectRe: [PATCH 2/3] sched: fix static keys race in sched_feat
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On Fri, 2013-06-28 at 22:30 +0000, jbaron@akamai.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@akamai.com>

-- Steve




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