linux-kernel - Re: [v2 PATCH 2/2]: pseries: Implement Pseries Processor Idle idle module.

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Message-Id: <1251286625.1329.6.camel@twins>
Date:	Wed, 26 Aug 2009 13:37:05 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	arun@...ux.vnet.ibm.com
Cc:	Joel Schopp <jschopp@...tin.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: [v2 PATCH 2/2]: pseries: Implement Pseries Processor Idle idle
 module.

On Wed, 2009-08-26 at 17:02 +0530, Arun R Bharadwaj wrote:
> * Peter Zijlstra <a.p.zijlstra@...llo.nl> [2009-08-26 13:27:18]:
> 
> > On Wed, 2009-08-26 at 16:40 +0530, Arun R Bharadwaj wrote:
> > > +void (*pm_idle)(void);
> > > +EXPORT_SYMBOL_GPL(pm_idle);
> > 
> > Seriously.. this caused plenty problems over on x86 and you're doing the
> > exact same dumb thing?
> > 
> 
> Hi Peter,
> 
> Cpuidle assumes pm_idle to be the default idle power management
> function. So i should either do this, or change the stuff in cpuidle.c
> so that it is more abstract.

I would much prefer the latter, I've been telling the x86 power folks to
fix this like forever, but they never seem to get around to it.

They even tried adding a second such unmanaged function pointer for
play-dead, instead of integrating everything into a single management
interface.

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