linux-kernel - Re: [PATCH] cpufreq: pass policy to ->get() driver callback

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Date:	Fri, 04 Sep 2015 16:50:11 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	Kristen Carlson Accardi <kristen@...ux.intel.com>,
	open list <linux-kernel@...r.kernel.org>,
	Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH] cpufreq: pass policy to ->get() driver callback

On Thursday, September 03, 2015 10:15:45 AM Viresh Kumar wrote:
> On 31-07-15, 16:14, Viresh Kumar wrote:
> > CPUFreq drivers today support ->get(cpu) callback, which returns current
> > clock rate of the CPU. The problem with ->get() is that it takes cpu
> > number as parameter and this unnecessarily makes things complex.
> > 
> > Firstly the core gets the cpu number by doing operation 'policy->cpu' on
> > the policy and then many drivers need to get the policy back and so do
> > cpufreq_cpu_get(cpu) on the cpu passed as argument to ->get().
> > 
> > It would be better if we pass them 'policy' directly and drivers can use
> > policy->cpu if that's all they need.
> > 
> > Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> 
> Is this getting moved to 4.4?

I'm really unsure about this change at all.

I have a concern that it may not go in the right direction.  I'll say more about
that later today.

Thanks,
Rafael

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