linux-kernel - Re: [PATCH] ARM: b.L: fix unmet dependency for CPU

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Date:	Thu, 13 Nov 2014 13:00:26 -0500 (EST)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
cc:	Pankaj Dubey <pankaj.dubey@...sung.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: b.L: fix unmet dependency for CPU_PM

On Thu, 13 Nov 2014, Russell King - ARM Linux wrote:

> On Thu, Nov 13, 2014 at 12:44:22PM -0500, Nicolas Pitre wrote:
> > On Thu, 13 Nov 2014, Pankaj Dubey wrote:
> > 
> > > If BL_SWITCHER is enabled but SUSPEND and CPU_IDLE is not enabled
> > > we are getting following config warning.
> > > 
> > > warning: (BL_SWITCHER) selects CPU_PM which has unmet direct
> > > dependencies (SUSPEND || CPU_IDLE)
> > > 
> > > So BL_SWITCHER should enable CPU_PM only if either of SUSPEND or
> > > CPU_IDLE is selected.
> > > 
> > > Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
> > > ---
> > >  arch/arm/Kconfig |    2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> > > index 9d580d0..fe3d969 100644
> > > --- a/arch/arm/Kconfig
> > > +++ b/arch/arm/Kconfig
> > > @@ -1417,7 +1417,7 @@ config BL_SWITCHER
> > >  	bool "big.LITTLE switcher support"
> > >  	depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
> > >  	select ARM_CPU_SUSPEND
> > > -	select CPU_PM
> > > +	select CPU_PM if (SUSPEND || CPU_IDLE)
> > 
> > NAK.  You just broke the code by doing this. CPU_PM is a requirement 
> > here.  The dependencies for CPU_PM is lacking.
> 
> Is there any real technical reason that CPU_PM depends on SUSPEND ||
> CPU_IDLE ?  If not, those dependencies should be killed.

Those dependencies look artificial to me.


Nicolas
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