linux-kernel - Re: [PATCH V2 1/2] sched: idle: Encapsulate the code to compile it out

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Date:	Thu, 01 May 2014 00:56:41 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	peterz@...radead.org, mingo@...e.hu, amit.kucheria@...aro.org,
	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>
Subject: Re: [PATCH V2 1/2] sched: idle: Encapsulate the code to compile it out

On Thursday, May 01, 2014 12:47:25 AM Rafael J. Wysocki wrote:
> On Wednesday, April 30, 2014 02:01:02 PM Daniel Lezcano wrote:
> > Encapsulate the large portion of cpuidle_idle_call inside another
> > function so when CONFIG_CPU_IDLE=n, the code will be compiled out.
> > Also that is benefitial for the clarity of the code as it removes
> > a nested indentation level.
> > 
> > Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> 
> Well, this conflicts with
> 
> https://patchwork.kernel.org/patch/4071541/
> 
> which you haven't commented on and I still want cpuidle_select() to be able to
> return negative values because of
> 
> https://patchwork.kernel.org/patch/4089631/
> 
> (and I have one more patch on top of these two that requires this).

Moreover (along the lines of Nico said) after https://patchwork.kernel.org/patch/4071541/
we actually don't need the #ifdef CONFIG_CPU_IDLE in your patch, because cpuidle_select()
for CONFIG_CPU_IDLE unset is a static inline returning a negative number and the compiler
should optimize out the blocks that depend on it being non-negative.

Thanks!


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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