linux-kernel - Re: [PATCH 3/5] cpuidle: idle: menu: Don't reflect when a state selection failed

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Message-ID: <20141024135606.GD21513@worktop.programming.kicks-ass.net>
Date:	Fri, 24 Oct 2014 15:56:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	rjw@...ysocki.net, nicolas.pitre@...aro.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 3/5] cpuidle: idle: menu: Don't reflect when a state
 selection failed

On Fri, Oct 24, 2014 at 03:43:53PM +0200, Daniel Lezcano wrote:
> On 10/24/2014 03:38 PM, Peter Zijlstra wrote:
> >On Mon, Oct 20, 2014 at 06:25:41PM +0200, Daniel Lezcano wrote:
> >>+++ b/kernel/sched/idle.c
> >>@@ -162,7 +162,8 @@ use_default:
> >>  	/*
> >>  	 * Give the governor an opportunity to reflect on the outcome
> >>  	 */
> >>-	cpuidle_reflect(dev, entered_state);
> >>+	if (entered_state >= 0)
> >>+		cpuidle_reflect(dev, entered_state);
> >>
> >
> >Given we'll do use_default: when next_state < 0, we actually never get
> >here unless this is true.
> 
> There is the 'cpuidle_enter' call in between which may fail.

Hmm, indeed there is. I had not expected that one to fail like this.
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