linux-kernel - Re: [PATCH 2/3] cpumask: Introduce DYING mask

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Date:   Mon, 22 Mar 2021 11:07:37 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Qais Yousef <qais.yousef@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>, 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,
        bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com,
        vincent.donnefort@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] cpumask: Introduce DYING mask

On Sun, 21 Mar 2021 19:30:37 +0000
Qais Yousef <qais.yousef@....com> wrote:

> On 03/10/21 15:53, Peter Zijlstra wrote:
> > --- a/kernel/cpu.c
> > +++ b/kernel/cpu.c
> > @@ -160,6 +160,9 @@ static int cpuhp_invoke_callback(unsigne
> >  	int (*cb)(unsigned int cpu);
> >  	int ret, cnt;
> >  
> > +	if (bringup != !cpu_dying(cpu))  
> 
> nit: this condition is hard to read

Would
	if (bringup == !!cpu_dying(cpu))

read better?

-- Steve

> 
> > +		set_cpu_dying(cpu, !bringup);