linux-kernel - Re: [PATCH] cpupower: Correct return type of cpu_power_is_cpu

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Date:   Fri, 23 Sep 2016 21:47:53 +0530
From:   Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
To:     Laura Abbott <labbott@...hat.com>,
        Thomas Renninger <trenn@...e.com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpupower: Correct return type of cpu_power_is_cpu_online
 in cpufreq

Hi,

On 09/09/2016 10:55 PM, Laura Abbott wrote:
> When converting to a shared library in ac5a181d065d ("cpupower: Add
> cpuidle parts into library"), cpu_freq_cpu_exists was converted to
> cpupower_is_cpu_online. cpu_req_cpu_exists returned 0 on success and
> -ENOSYS on failure whereas cpupower_is_cpu_online returns 1 on success.
> Check for the correct return value in cpufreq-set.
> 
> See https://bugzilla.redhat.com/show_bug.cgi?id=1374212
> 
> Fixes: ac5a181d065d ("cpupower: Add cpuidle parts into library")
> Reported-by: Julian Seward <jseward@....org>
> Signed-off-by: Laura Abbott <labbott@...hat.com>
> ---
>  tools/power/cpupower/utils/cpufreq-set.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/power/cpupower/utils/cpufreq-set.c b/tools/power/cpupower/utils/cpufreq-set.c
> index b4bf769..8971d71 100644
> --- a/tools/power/cpupower/utils/cpufreq-set.c
> +++ b/tools/power/cpupower/utils/cpufreq-set.c
> @@ -296,7 +296,7 @@ int cmd_freq_set(int argc, char **argv)
>  			struct cpufreq_affected_cpus *cpus;
> 
>  			if (!bitmask_isbitset(cpus_chosen, cpu) ||
> -			    cpupower_is_cpu_online(cpu))
> +			    cpupower_is_cpu_online(cpu) != 1)
>  				continue;
> 
>  			cpus = cpufreq_get_related_cpus(cpu);
> @@ -316,7 +316,7 @@ int cmd_freq_set(int argc, char **argv)
>  	     cpu <= bitmask_last(cpus_chosen); cpu++) {
> 
>  		if (!bitmask_isbitset(cpus_chosen, cpu) ||
> -		    cpupower_is_cpu_online(cpu))
> +		    cpupower_is_cpu_online(cpu) != 1)
>  			continue;
> 
>  		if (cpupower_is_cpu_online(cpu) != 1)
		^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Can you also remove the above check where the same condition
'cpupower_is_cpu_online(cpu) != 1' is tested twice ?

Thanks and Regards,
Shilpa