linux-kernel - Re: [PATCH 02/34] cpufreq: acpi: remove calls to cpufreq_notify

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Date:	Fri, 16 Aug 2013 23:30:56 +0800
From:	Lan Tianyu <lantianyu1986@...il.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Patch Tracking <patches@...aro.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-kernel@...r kernel org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 02/34] cpufreq: acpi: remove calls to cpufreq_notify_transition()

2013/8/16 Viresh Kumar <viresh.kumar@...aro.org>:
> On 16 August 2013 13:24, Lan Tianyu <lantianyu1986@...il.com> wrote:
>> Sorry for misoperation.
>
> No Problem...
>
>>                 One concern. Target() callback may return before changing
>> cpufreq actually due to some check failures. After this change, prechange
>> event will be triggered when these check failures take place. I am not sure
>> whether this should be took into account.
>
> Yes, if you see the first patch of this series, it takes this into
> account.. In case
> target() failed and returned an error, we simply notify the POST CHANGE
> notification with old frequencies instead of new ones. I believe that would be
> enough..

Yes, I have seen it but I missed the following two patches because they
are not in the linux-pm tree. You moved the cpufreq_frequency_table_target()
to cpufreq core and before notifying PRE CHANGE notification. The major
check has been done. Now I think it's ok. Thanks for explanation.

http://www.spinics.net/lists/cpufreq/msg06970.html
http://www.spinics.net/lists/cpufreq/msg06896.html

Reviewed-by: Lan Tianyu <tianyu.lan@...el.com>

>
> This is exactly what acpi-cpufreq and others are doing currently.
>
> Hope I answered your question well?
>
> --
> viresh



-- 
Best regards
Tianyu Lan
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