linux-kernel - Re: [PATCH] cpufreq: schedutil: Merge initialization code of sg

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Date:   Wed, 27 Sep 2023 14:25:17 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Liao Chang <liaochang1@...wei.com>
Cc:     rafael@...nel.org, mingo@...hat.com, peterz@...radead.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: schedutil: Merge initialization code of sg_cpu
 in single loop

On 08-09-23, 03:16, Liao Chang wrote:
> The initialization code of the per-cpu sg_cpu struct is currently split
> into two for-loop blocks. This can be simplified by merging the two
> blocks into a single loop. This will make the code more maintainable.
> 
> Signed-off-by: Liao Chang <liaochang1@...wei.com>
> ---
>  kernel/sched/cpufreq_schedutil.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
> index 4492608b7d7f..f3a95def49cc 100644
> --- a/kernel/sched/cpufreq_schedutil.c
> +++ b/kernel/sched/cpufreq_schedutil.c
> @@ -767,14 +767,6 @@ static int sugov_start(struct cpufreq_policy *policy)
>  
>  	sg_policy->need_freq_update = cpufreq_driver_test_flags(CPUFREQ_NEED_UPDATE_LIMITS);
>  
> -	for_each_cpu(cpu, policy->cpus) {
> -		struct sugov_cpu *sg_cpu = &per_cpu(sugov_cpu, cpu);
> -
> -		memset(sg_cpu, 0, sizeof(*sg_cpu));
> -		sg_cpu->cpu			= cpu;
> -		sg_cpu->sg_policy		= sg_policy;
> -	}
> -
>  	if (policy_is_shared(policy))
>  		uu = sugov_update_shared;
>  	else if (policy->fast_switch_enabled && cpufreq_driver_has_adjust_perf())
> @@ -785,6 +777,9 @@ static int sugov_start(struct cpufreq_policy *policy)
>  	for_each_cpu(cpu, policy->cpus) {
>  		struct sugov_cpu *sg_cpu = &per_cpu(sugov_cpu, cpu);
>  
> +		memset(sg_cpu, 0, sizeof(*sg_cpu));
> +		sg_cpu->cpu = cpu;
> +		sg_cpu->sg_policy = sg_policy;
>  		cpufreq_add_update_util_hook(cpu, &sg_cpu->update_util, uu);
>  	}
>  	return 0;

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

-- 
viresh