linux-kernel - Re: [PATCH 0/2] Add exit_prepare callback to the cpufreq

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Message-ID: <CAKohpomLW17B=Sk42tczzDF+VGwn7hT521osWPi5TcgqpCPZ_w@mail.gmail.com>
Date:	Wed, 19 Mar 2014 10:33:59 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Dirk Brandewie <dirk.brandewie@...il.com>,
	Dirk Brandewie <dirk.j.brandewie@...el.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Patrick Marlier <patrick.marlier@...il.com>
Subject: Re: [PATCH 0/2] Add exit_prepare callback to the cpufreq_driver interface.

On 18 March 2014 17:46, Srivatsa S. Bhat
<srivatsa.bhat@...ux.vnet.ibm.com> wrote:
> Agreed. As far as I understand, for ->target drivers, today we use GOV_STOP
> to stop managing the CPU going offline. And for ->setpolicy drivers, we will
> use this new callback to achieve the same goal.

So a better question would be: What's the purpose of ->stop() call for a policy?
Stop managing CPUs of that policy? Or even do something on CPUs of a policy
before CPUs are offlined?

Probably in the current solution Dirk is doing both these things..

And so I thought maybe its better not to restrict ->stop() to just
setpolicy() drivers.
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