linux-kernel - Re: [PATCH v8 6/6] cpufreq: powernv: Add sysfs attributes to show throttle stats

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Message-ID: <20160203082700.GZ31828@vireshk>
Date:	Wed, 3 Feb 2016 13:57:00 +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,
	rjw@...ysocki.net, linux-pm@...r.kernel.org, pc@...ibm.com,
	anton@...ba.org, ego@...ux.vnet.ibm.com,
	shreyas@...ux.vnet.ibm.com, bsingharora@...il.com,
	mpe@...erman.id.au, linux-api@...r.kernel.org
Subject: Re: [PATCH v8 6/6] cpufreq: powernv: Add sysfs attributes to show
 throttle stats

On 03-02-16, 01:11, Shilpasri G Bhat wrote:
>  static int init_chip_info(void)
>  {
>  	unsigned int chip[256];
> -	unsigned int cpu, i;
> +	unsigned int cpu;
>  	unsigned int prev_chip_id = UINT_MAX;
>  	cpumask_t cpu_mask;
> -	int ret = -ENOMEM;
> +	int i, j, ret = -ENOMEM;
>  
>  	core_to_chip_map = kcalloc(cpu_nr_cores(), sizeof(unsigned int),
>  				   GFP_KERNEL);
> @@ -583,12 +711,51 @@ static int init_chip_info(void)
>  		goto free_chip_map;
>  
>  	for (i = 0; i < nr_chips; i++) {
> +		char name[10];
> +
>  		chips[i].id = chip[i];
>  		cpumask_copy(&chips[i].mask, cpumask_of_node(chip[i]));
>  		INIT_WORK(&chips[i].throttle, powernv_cpufreq_work_fn);
> +
> +		for (j = 0; j <= OCC_MAX_THROTTLE_STATUS; j++) {
> +			chips[i].reason[j] =
> +			     kcalloc(powernv_pstate_info.nr_pstates,
> +				     sizeof(int), GFP_KERNEL);
> +			if (!chips[i].reason[j]) {
> +				ret = -ENOMEM;
> +				goto free_chip;
> +			}
> +		}
> +
> +		snprintf(name, sizeof(name), "chip%d", chips[i].id);
> +		ret = kobject_init_and_add(&chips[i].kobj,
> +					   get_ktype(cpufreq_global_kobject),

Sorry but why do you need to create a kobject here ? A simple
sysfs_create_group() can create groups (directories) for you.

> +					   cpufreq_global_kobject, name);
> +		if (ret)
> +			goto free_chip;
> +
> +		ret = sysfs_create_group(&chips[i].kobj, &throttle_stat_group);
> +		if (ret) {
> +			pr_info("Chip %d failed to create throttle sysfs group\n",
> +				chips[i].id);
> +			goto free_kobject;
> +		}
>  	}

-- 
viresh