linux-kernel - Re: [PATCH 2/2] cpufreq: make sure frequency transitions are serialized

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Message-ID: <CAKohpo=kBvx3-fkmOUzk3PsbGZxicAWD9iJyUBkXYG-1wM_WNA@mail.gmail.com>
Date:	Fri, 13 Sep 2013 09:53:09 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Stephen Warren <swarren@...dotorg.org>
Cc:	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Patch Tracking <patches@...aro.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH 2/2] cpufreq: make sure frequency transitions are serialized

On 12 September 2013 15:40, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> Some part of this patch was pushed in mainline earlier but was then removed due
> to loopholes in the patch. Those are now fixed and this patch is tested by the
> people who reported these problems.
>
> Whenever we are changing frequency of a cpu, we are calling PRECHANGE and
> POSTCHANGE notifiers. They must be serialized. i.e. PRECHANGE or POSTCHANGE
> shouldn't be called twice contiguously. Also, calls to cpufreq_driver_target()
> or cpufreq_driver->target() must also be serialized. Following examples show why
> this is important:

Adding:

Tested-by: Stephen Warren <swarren@...dia.com>

Picked from the other thread..
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