linux-kernel - Re: [PATCH v7 3/3] sched/uclamp: Fix a deadlock when enabling uclamp static key

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Date:   Thu, 16 Jul 2020 12:13:28 +0100
From:   Qais Yousef <qais.yousef@....com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Doug Anderson <dianders@...omium.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Patrick Bellasi <patrick.bellasi@...bug.net>,
        Chris Redpath <chris.redpath@....com>,
        Lukasz Luba <lukasz.luba@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 3/3] sched/uclamp: Fix a deadlock when enabling uclamp
 static key

On 07/16/20 12:03, Qais Yousef wrote:

[...]

> Fix by ensuring we enable the key outside of the critical section in
> __sched_setscheduler()
> 
> Fixes: 46609ce22703 ("sched/uclamp: Protect uclamp fast path code with static key")
> Signed-off-by: Qais Yousef <qais.yousef@....com>

I am assuming this Fixes tag is still valid given the patch is only in
tip/sched/core only. And that the hash value won't change after Linus merges
it.

Thanks

--
Qais Yousef