linux-kernel - Re: [PATCH] cpufreq: skip loading acpi_cpufreq after intel

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Message-ID: <CAE9FiQUXGtNeAS70Mr6Nscax26dRoXTCyb28gz1iX2j1s8Nojw@mail.gmail.com>
Date:	Fri, 20 Sep 2013 10:08:07 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpufreq: skip loading acpi_cpufreq after intel_pstate

On Thu, Sep 19, 2013 at 11:10 PM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> On 20 September 2013 10:56, Yinghai Lu <yinghai@...nel.org> wrote:
>> If the hw support intel_pstate and acpi_cpufreq, intel_pstate will
>> get loaded at first.
>
> s/at //
>
>>
>> acpi_cpufreq_init will call acpi_cpufreq_early_init()
>> and it allocate perf data and init those perf data in ACPI core, (that
>
> s/it /that will /
>
>> will go over all cpus).
>
> s/go over/cover/
>
>> but late it will free them as cpufreq_register_driver(acpi_cpufreq) will
>
> s/late/later
>
>> return fail as init_pstate already take over before.
>
> write it as: fail as intel_pstate is already registered.
>
>> Use cpufreq_get_current_driver() to check if we can skip the
>> acpi_cpufreq loading.
>
> The below material looks to be a separate issue and so we
> probably break this patch into two?

ok, check that.

Thanks

Yinghai
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