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

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Message-ID: <CAOh2x=nFG9XtPqdjG3ACuCS7J=YhMeQB3C_7K2ccnoB+maeovw@mail.gmail.com>
Date:	Tue, 18 Mar 2014 10:39:22 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	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 Sat, Mar 15, 2014 at 7:29 AM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> I honestly don't think that ->target drivers will ever do anything like it,
> because they need the governor to "exit" before.  So we are talking about the
> only two ->setpolicy drivers in the tree here.

I don't have a example platform which would need it but as I can see there are
platforms which want to do this when CPUs goes down from disable_nonboot_cpus(),
I would be in favor to keep this option available for them as well..
They might want
to do this when last CPU of a policy goes down, they might be able to save some
power over there.
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