linux-kernel - Re: [PATCH v12] cpufreq: powernv: Add sysfs attributes to show throttle stats

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Message-ID: <20160322113307.GI5272@vireshk-i7>
Date:	Tue, 22 Mar 2016 17:03:07 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	ego@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	rjw@...ysocki.net, shreyas@...ux.vnet.ibm.com,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v12] cpufreq: powernv: Add sysfs attributes to show
 throttle stats

I really wanted to Ack this time, but you know I am nitpicking again :(

On 22-03-16, 16:18, Shilpasri G Bhat wrote:
>  static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy)
>  {
> -	int base, i;
> +	int base, i, ret;
>  
>  	base = cpu_first_thread_sibling(policy->cpu);
>  
>  	for (i = 0; i < threads_per_core; i++)
>  		cpumask_set_cpu(base + i, policy->cpus);
>  
> +	if (!policy->driver_data) {

Declare ret here, as it is going to be used only within the if block.

> +		ret = sysfs_create_group(&policy->kobj, &throttle_attr_grp);
> +		if (ret) {
> +			pr_info("Failed to create throttle stats directory for cpu %d\n",
> +				policy->cpu);
> +			return ret;
> +		}
> +		/*
> +		 * policy->driver_data is used as a flag for one-time
> +		 * creation of throttle sysfs files.
> +		 */
> +		policy->driver_data = (void *)policy;

This is far better then the ugly solution I suggested on our private chat :),
but you should drop (void *) typecast. Its not required.

-- 
viresh