linux-kernel - Re: [PATCH 12/13] cpufreq: intel_pstate: Supply struct attribute description for get_aperf_mperf

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Date:   Tue, 14 Jul 2020 18:35:19 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        Dirk Brandewie <dirk.j.brandewie@...el.com>
Subject: Re: [PATCH 12/13] cpufreq: intel_pstate: Supply struct attribute
 description for get_aperf_mperf_shift()

On Tue, Jul 14, 2020 at 4:51 PM Lee Jones <lee.jones@...aro.org> wrote:
>
> Fixes the following W=1 kernel build warning(s):
>
>  drivers/cpufreq/intel_pstate.c:293: warning: Function parameter or member 'get_aperf_mperf_shift' not described in 'pstate_funcs'
>
> Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Cc: Len Brown <lenb@...nel.org>
> Cc: Dirk Brandewie <dirk.j.brandewie@...el.com>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/cpufreq/intel_pstate.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 44c7b4677675d..f92fc69c87269 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -275,6 +275,8 @@ static struct cpudata **all_cpu_data;
>   * @get_min:           Callback to get minimum P state
>   * @get_turbo:         Callback to get turbo P state
>   * @get_scaling:       Callback to get frequency scaling factor
> + * @get_aperf_mperf_shift: Callback to get the number of clock cycles after
> + *                     aperf, merf is incremented

This added description is inaccurate.  It should be something like
"Callback to get the APERF vs MPERF frequency difference".

>   * @get_val:           Callback to convert P state to actual MSR write value
>   * @get_vid:           Callback to get VID data for Atom platforms
>   *
> --