linux-kernel - Re: [PATCH] cpufreq: Avoid calling cpufreq driver's target() routine if target

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Message-ID: <11869950.r5dVYWTkdx@vostro.rjw.lan>
Date:	Wed, 31 Oct 2012 01:44:50 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-dev@...ts.linaro.org, patches@...aro.org,
	pdsw-power-team@....com
Subject: Re: [PATCH] cpufreq: Avoid calling cpufreq driver's target() routine if target_freq == policy->cur

On Friday, October 26, 2012 01:17:12 PM Rafael J. Wysocki wrote:
> On Friday, October 26, 2012 03:06:26 PM Viresh Kumar wrote:
> > Avoid calling cpufreq driver's target() routine if new frequency is same as
> > policies current frequency.
> > 
> > Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> 
> Looks reasonable.
> 
> Any objection from anyone?

OK, no objections.

Applied to the linux-next branch of linux-pm.git as v3.8 material.

Thanks,
Rafael


> > ---
> >  drivers/cpufreq/cpufreq.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> > index 261ef65..28dc134 100644
> > --- a/drivers/cpufreq/cpufreq.c
> > +++ b/drivers/cpufreq/cpufreq.c
> > @@ -1476,6 +1476,10 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
> >  
> >  	pr_debug("target for CPU %u: %u kHz, relation %u\n", policy->cpu,
> >  		target_freq, relation);
> > +
> > +	if (target_freq == policy->cur)
> > +		return 0;
> > +
> >  	if (cpu_online(policy->cpu) && cpufreq_driver->target)
> >  		retval = cpufreq_driver->target(policy, target_freq, relation);
> >  
> > 
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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