linux-kernel - Re: [PATCH 34/35] tick: Provide tick_suspend

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Date:	Tue, 17 Feb 2015 12:55:44 -0500 (EST)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: Re: [PATCH 34/35] tick: Provide tick_suspend_local()

On Tue, 17 Feb 2015, Lorenzo Pieralisi wrote:

> On Mon, Feb 16, 2015 at 12:15:09PM +0000, Peter Zijlstra wrote:
> > From: Thomas Gleixner <tglx@...utronix.de>
> > 
> > This function is intended to use by the freezer once the freezer folks
> > solved their race issues. Also required to get rid of the ARM BL
> > switcher tick hackery.
> 
> Totally agree with the patch(es), but I noticed that the ARM bL switcher
> does not depend on PM_SLEEP, so I do not think you can compile
> tick_{suspend/resume}_local() out if !PM_SLEEP, unless dependency
> is enforced by the ARM bL switcher config but I do not think that
> the config dependency really exists, Nico please correct me if I am
> wrong.

The ARM bL switcher does not depend on PM_SUSPEND nor does it enforce it 
because it currently doesn't need it.  So yeah, either PM_SUSPEND is 
selected bringing quite a lot of code with it, or another symbol is used 
for those functions (CONFIG_HOTPLUG_CPU maybe?).


Nicolas
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