linux-kernel - Re: [RFC v01 2/3] PowerCap: Add class driver

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Date:	Fri, 02 Aug 2013 17:06:58 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	Joe Perches <joe@...ches.com>
CC:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org
Subject: Re: [RFC v01 2/3] PowerCap: Add class driver

On 08/02/2013 03:43 PM, Joe Perches wrote:
> On Fri, 2013-08-02 at 11:08 -0700, Srinivas Pandruvada wrote:
>> Added power cap class driver, which provides an API for client drivers
>> to use and provide a consistant sys-fs interface to user mode.
> Just some stylistic notes.
>
>> diff --git a/drivers/powercap/powercap_sys.c b/drivers/powercap/powercap_sys.c
> []
>> +/* Power zone show function */
>> +#define define_device_show(_attr)		\
>> +static ssize_t show_##_attr(struct device *dev, struct device_attribute *attr,\
>> +			char *buf) \
> Using _attr and another variable named attr is at least
> visually confusing.
>
> Maybe use name or type instead of _attr?
>
>> +{ \
>> +	u64 value; \
>> +	ssize_t len = -EINVAL; \
>> +	struct powercap_zone_device *pcd_dev = dev_get_drvdata(dev); \
>> +	\
>> +	if (pcd_dev && pcd_dev->ops && pcd_dev->ops->get_##_attr) { \
>> +		mutex_lock(&pcd_dev->lock); \
>> +		if (!pcd_dev->ops->get_##_attr(pcd_dev, &value)) \
>> +			len = sprintf(buf, "%lld\n", value); \
>> +		mutex_unlock(&pcd_dev->lock); \
>> +	} \
>> +	\
>> +	return len; \
>> +}
>> +
>> +/* Power zone store function; only reset is possible */
>> +#define define_device_store(_attr)		\
>> +static ssize_t store_##_attr(struct device *dev,\
>> +				struct device_attribute *attr, \
>> +				const char *buf, size_t count) \
> here too
>
> []
>
>> +/* Power zone constraint show function */
>> +#define define_device_constraint_show(_attr) \
>> +static ssize_t show_constraint_##_attr(struct device *dev, \
>> +				struct device_attribute *attr,\
>> +				char *buf) \
> and here
>
> []
>
>> +/* Power zone constraint store function */
>> +#define define_device_constraint_store(_attr) \
>> +static ssize_t store_constraint_##_attr(struct device *dev,\
>> +				struct device_attribute *attr, \
>> +				const char *buf, size_t count) \
> etc...
>
>> +struct powercap_zone_constraint *powercap_zone_add_constraint(
>> +				struct powercap_zone_device *pcd_dev,
>> +				struct powercap_zone_constraint_ops *ops)
>> +{
> []
>> +	dev_dbg(&pcd_dev->device, "powercap_zone_add_constraint\n");
> These logging messages aren't useful.
> function tracing works very well.
>
>
>
Thanks. Will change in the next patchset.

Thanks,
Srinivas
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