linux-kernel - Re: [PATCH v2] sched/topology: Allow sched_asym

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Message-ID: <ce8cfbad-6f2d-fceb-b045-a1d9c682f788@arm.com>
Date:   Tue, 15 Oct 2019 13:57:51 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Quentin Perret <qperret@...gle.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        peterz@...radead.org, vincent.guittot@...aro.org,
        Dietmar.Eggemann@....com, morten.rasmussen@....com,
        stable@...r.kernel.org
Subject: Re: [PATCH v2] sched/topology: Allow sched_asym_cpucapacity to be
 disabled

On 15/10/2019 12:56, Quentin Perret wrote:
> Hmm, a problem here is that static_branch*() can block (it uses a
> mutex) while you're in the rcu section, I think.
> 
> I suppose you could just move this above rcu_read_lock() and use
> rcu_access_pointer() instead ?
> 

Right, I got confused again, the only problem is with the rcu_read_lock(),
so the increment is fine but the decrement isn't.

Let me try this again with more coffee.

> Thanks,
> Quentin
>