linux-kernel - Re: [PATCH v2 1/2] cpufreq: Fix a comment in cpufreq_policy

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Date:   Wed, 1 Dec 2021 12:21:13 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Tang Yizhou <tangyizhou@...wei.com>
Cc:     rafael.j.wysocki@...el.com, rafael@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] cpufreq: Fix a comment in cpufreq_policy_free

On 01-12-21, 15:14, Tang Yizhou wrote:
> Comment both when CPUFREQ_CREATE_POLICY and CPUFREQ_REMOVE_POLICY
> notification are sent.
> 
> Signed-off-by: Tang Yizhou <tangyizhou@...wei.com>
> ---
>  drivers/cpufreq/cpufreq.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index e338d2f010fe..e76777881739 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -1296,8 +1296,9 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy)
>  
>  	if (policy->max_freq_req) {
>  		/*
> -		 * CPUFREQ_CREATE_POLICY notification is sent only after
> -		 * successfully adding max_freq_req request.
> +		 * Need to send CPUFREQ_REMOVE_POLICY notification if
> +		 * max_freq_req request is successfully added.
> +		 * See also: CPUFREQ_CREATE_POLICY notification.

I will rather write this as:

		/*
                 * Remove max_freq_req after sending CPUFREQ_REMOVE_POLICY
                 * notification, since CPUFREQ_CREATE_POLICY notification was
                 * sent after adding max_freq_req earlier.
                 */

>  		 */
>  		blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
>  					     CPUFREQ_REMOVE_POLICY, policy);
> @@ -1429,6 +1430,10 @@ static int cpufreq_online(unsigned int cpu)
>  			goto out_destroy_policy;
>  		}
>  
> +		/*
> +		 * CPUFREQ_CREATE_POLICY notification is sent only after
> +		 * successfully adding max_freq_req request.
> +		 */

This is obvious, we don't need a comment here.

>  		blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
>  				CPUFREQ_CREATE_POLICY, policy);
>  	}
> -- 
> 2.17.1

-- 
viresh