linux-kernel - Re: [PATCH] staging: ozwpan: Convert printk to dev

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Date:	Tue, 25 Jun 2013 09:40:20 -0700
From:	Joe Perches <joe@...ches.com>
To:	Rupesh Gujare <rupesh.gujare@...el.com>
Cc:	devel@...uxdriverproject.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	shigekatsu.tateno@...el.com
Subject: Re: [PATCH] staging: ozwpan: Convert printk to dev_dbg()

On Tue, 2013-06-25 at 17:30 +0100, Rupesh Gujare wrote:
> convert all debug messages from printk to dev_dbg() & add kernel config to
> enable/disable these messages during compilation.
[]
> -#define oz_trace(...) printk(TRACE_PREFIX __VA_ARGS__)
> +#define oz_trace(fmt, ...) dev_dbg(g_oz_wpan_dev, fmt, ##__VA_ARGS__);
>  #ifdef WANT_VERBOSE_TRACE
>  extern unsigned long trace_flags;
> -#define oz_trace2(_flag, ...) \
> -	do { if (trace_flags & _flag) printk(TRACE_PREFIX __VA_ARGS__); \
> +#define oz_trace2(_flag, fmt, ...) \
> +	do { if (trace_flags & _flag) \
> +		dev_dbg(g_oz_wpan_dev, fmt, ##__VA_ARGS__); \
>  	} while (0)

I think oz_trace is a poor name.
It implies you're using the trace subsystem
trace_flags as a global name is also poor
g_oz_wpan_dev is too as it limits the module to
a single dev instance.

I suggest:

#define oz_dbg(level, fmt, ...)					\
do {								\
	if (level & oz_dbg_mask)				\
		dev_dbg(g_oz_wpan_dev, fmt, ##__VA_ARGS__);	\
} while (0)

or better avoiding the single dev:

#define oz_dbg(level, dev, fmt, ...)				\
do {								\
	if (level & oz_dbg_mask)				\
		dev_dbg(dev, fmt, ##__VA_ARGS__);		\
} while (0)

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