linux-kernel - Re: [PATCH v4 02/10] cpufreq: provide default frequency-invariance setter function

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Message-ID: <20170919183917.GC2792@ubuntu>
Date:   Tue, 19 Sep 2017 11:39:17 -0700
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux@....linux.org.uk,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Juri Lelli <juri.lelli@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v4 02/10] cpufreq: provide default frequency-invariance
 setter function

On 25-08-17, 15:31, Dietmar Eggemann wrote:
> Frequency-invariant accounting support based on the ratio of current
> frequency and maximum supported frequency is an optional feature an arch
> can implement.
> 
> Since there are cpufreq drivers (e.g. cpufreq-dt) which can be build for
> different arch's a default implementation of the frequency-invariance
> setter function arch_set_freq_scale() is needed.
> 
> This default implementation is an empty weak function which will be
> overwritten by a strong function in case the arch provides one.
> 
> The setter function passes the cpumask of related (to the frequency
> change) cpus (online and offline cpus), the (new) current frequency and
> the maximum supported frequency.
> 
> Cc: Rafael J. Wysocki <rjw@...ysocki.net>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
> ---
>  drivers/cpufreq/cpufreq.c | 6 ++++++
>  include/linux/cpufreq.h   | 3 +++
>  2 files changed, 9 insertions(+)

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh