linux-kernel - Re: [PATCH] cpufreq: Set policy to non-NULL only after all hotplug online work is done

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Date:	Mon, 24 Feb 2014 09:00:03 -0000
From:	skannan@...eaurora.org
To:	"Viresh Kumar" <viresh.kumar@...aro.org>
Cc:	"Saravana Kannan" <skannan@...eaurora.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] cpufreq: Set policy to non-NULL only after all hotplug
 online work is done


Viresh Kumar wrote:
> On 24 February 2014 14:17,  <skannan@...eaurora.org> wrote:
>> Sorry, not sure I understand what you mean.
>>
>> I agree, wording in my commit text might be unclear. I'll fix it after
>> we
>> agree on the code fix. In the MSM case, each CPU has it's own policy.
>>
>> I'm assuming your original complaint was about my confusing wording.
>> Maybe
>> that's not what you were pointing out?
>
> In your case each CPU has a separate policy structure as they have
> separately
> controllable clocks. But you also said that CPU0 is setting CPU1's
> governor to
> NULL. I don't see that happening. Each CPU sets its own governor to NULL
> on
> init().

When I said "CPU0 is setting CPU1's governor to NULL", I meant
thread/context running in CPU0 is setting CPU1's governor as part of
CPU1's ONLINE notifier.

-Saravana

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