linux-kernel - Re: [PATCH V4 2/7] cpufreq: Call __cpufreq

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Message-ID: <20160211115254.GC28558@vireshk>
Date:	Thu, 11 Feb 2016 17:22:54 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Rafael Wysocki <rjw@...ysocki.net>,
	Juri Lelli <juri.lelli@....com>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4 2/7] cpufreq: Call __cpufreq_governor() with
 policy->rwsem held

On 11-02-16, 10:48, Rafael J. Wysocki wrote:
> On Tue, Feb 9, 2016 at 4:46 AM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> > Also note that cpufreq_driver->stop_cpu() and ->exit() can get called
> > while policy->rwsem is held. That shouldn't have any side effects
> > though.
> 
> The last paragraph is unclear.
> 
> Is it supposed to mean that the change will cause
> cpufreq_driver->stop_cpu() and ->exit() to be called under
> policy->rwsem sometimes?

Yeah, reworded it a bit ..

Also note that, after this patch cpufreq_driver->stop_cpu() and ->exit()
will get called while policy->rwsem is held, which wasn't the case
earlier. That shouldn't have any side effects though.

-- 
viresh