linux-kernel - Re: [PATCH 3/3] sched: Use cpu_dying() to fix balance

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Message-ID: <YH8YTJfCkFJcGu30@hirez.programming.kicks-ass.net>
Date:   Tue, 20 Apr 2021 20:07:08 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vincent Donnefort <vincent.donnefort@....com>
Cc:     Valentin Schneider <valentin.schneider@....com>,
        tglx@...utronix.de, mingo@...nel.org, bigeasy@...utronix.de,
        swood@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, qais.yousef@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] sched: Use cpu_dying() to fix balance_push vs
 hotplug-rollback

On Tue, Apr 20, 2021 at 05:53:40PM +0100, Vincent Donnefort wrote:
> All good with that snippet on my end.
> 
> I wonder if balance_push() shouldn't use the cpu_of() accessor
> instead of rq->cpu.

That might be a personal quirk of mine, but for code that is under
CONFIG_SMP (as all balancing code must be) I tend to prefer the more
explicit rq->cpu usage. cpu_of() obviously also works.

> Otherwise,
> 
> + Reviewed-by: Vincent Donnefort <vincent.donnefort@....com>

Thanks!, now I get to write a Changelog :-)