linux-kernel - Re: [PATCH RESEND v4 4/4] cpufreq: powernv: Add sysfs attributes to show throttle stats

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Message-ID: <20160112111301.GB4187@in.ibm.com>
Date:	Tue, 12 Jan 2016 16:43:01 +0530
From:	Gautham R Shenoy <ego@...ux.vnet.ibm.com>
To:	Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	rjw@...ysocki.net, viresh.kumar@...aro.org,
	linux-pm@...r.kernel.org, pc@...ibm.com, anton@...ba.org,
	ego@...ux.vnet.ibm.com, shreyas@...ux.vnet.ibm.com
Subject: Re: [PATCH RESEND v4 4/4] cpufreq: powernv: Add sysfs attributes to
 show throttle stats

Hi Shilpa,

On Tue, Jan 12, 2016 at 04:24:27AM -0600, Shilpasri G Bhat wrote:

> +static inline int get_chip_index(struct kobject *kobj)

Probably have "get_chip_index(int id)". See the reason below.
> +{
> +	int i, id;
> +
> +	i = kstrtoint(kobj->name + 4, 0, &id);
> +	if (i)
> +		return i;
> +
> +	for (i = 0; i < nr_chips; i++)
> +		if (chips[i].id == id)
> +			return i;

This pattern to obtain a chip index from the chip id is repeated in
multiple place inside this file. Might be worthwhile to move this to a
helper function, i.e get_chip_index(id)!

> +	return -EINVAL;
> +}
> +
> +static ssize_t throttle_freq_show(struct kobject *kobj,
> +				  struct kobj_attribute *attr, char *buf)
> +{
> +	int i, count = 0, id;
> + 
        We obtain the id from kobj here and then obtain the index from
	id via the function below.
	

> +	id = get_chip_index(kobj);


> +	if (id < 0)
> +		return id;
> +
> +	for (i = 0; i < powernv_pstate_info.nr_pstates; i++)
> +		count += sprintf(&buf[count], "%d %d\n",
> +			       powernv_freqs[i].frequency,
> +			       chips[id].pstate_stat[i]);
> +
> +	return count;
> +}
> +
> +static struct kobj_attribute attr_throttle_frequencies =
> +__ATTR(throttle_frequencies, 0444, throttle_freq_show, NULL);
> +
--
Thanks and Regards
gautham.