linux-kernel - Re: [PATCH] cpupower : frequency-set -r option misses the last cpu in related cpu list

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Date:   Wed, 29 May 2019 17:42:34 +0530
From:   Gautham R Shenoy <ego.lkml@...il.com>
To:     Abhishek Goel <huntbag@...ux.vnet.ibm.com>
Cc:     trenn@...e.com, shuah@...nel.org,
        Linux PM list <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpupower : frequency-set -r option misses the last cpu in
 related cpu list

Hi Abhishek,

On Wed, May 29, 2019 at 3:02 PM Abhishek Goel
<huntbag@...ux.vnet.ibm.com> wrote:
>
> To set frequency on specific cpus using cpupower, following syntax can
> be used :
> cpupower -c #i frequency-set -f #f -r
>
> While setting frequency using cpupower frequency-set command, if we use
> '-r' option, it is expected to set frequency for all cpus related to
> cpu #i. But it is observed to be missing the last cpu in related cpu
> list. This patch fixes the problem.
>
> Signed-off-by: Abhishek Goel <huntbag@...ux.vnet.ibm.com>
> ---
>  tools/power/cpupower/utils/cpufreq-set.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/tools/power/cpupower/utils/cpufreq-set.c b/tools/power/cpupower/utils/cpufreq-set.c
> index 1eef0aed6..08a405593 100644
> --- a/tools/power/cpupower/utils/cpufreq-set.c
> +++ b/tools/power/cpupower/utils/cpufreq-set.c
> @@ -306,6 +306,8 @@ int cmd_freq_set(int argc, char **argv)
>                                 bitmask_setbit(cpus_chosen, cpus->cpu);
>                                 cpus = cpus->next;
>                         }
> +                       /* Set the last cpu in related cpus list */
> +                       bitmask_setbit(cpus_chosen, cpus->cpu);

Perhaps you could convert the while() loop to a do ..  while(). That
should will ensure
that we terminate the loop after setting the last valid CPU.


>                         cpufreq_put_related_cpus(cpus);
>                 }
>         }
> --
> 2.17.1
>


-- 
Thanks and Regards
gautham.