linux-kernel - Re: [PATCH 09/11] dynamic_debug: consolidate repetitive struct

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Date:	Thu, 11 Aug 2011 12:02:06 -0700
From:	Joe Perches <joe@...ches.com>
To:	Jason Baron <jbaron@...hat.com>
Cc:	gregkh@...e.de, jim.cromie@...il.com, bvanassche@....org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/11] dynamic_debug: consolidate repetitive struct
 _ddebug descriptor definitions

On Thu, 2011-08-11 at 14:36 -0400, Jason Baron wrote:
> From: Jason Baron <jbaron@...hat.com>
> Replace the repetitive  struct _ddebug descriptor definitions with
> a new DYNAMIC_DEBUG_META_DATA(fmt) macro.

Hey Jason.

I think some improvements can be made to this one.

> diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
[]
> @@ -54,33 +54,28 @@ extern int __dynamic_netdev_dbg(struct _ddebug *descriptor,
>  			     const char *fmt, ...)
>  	__attribute__ ((format (printf, 3, 4)));
>  
> +#define DYNAMIC_DEBUG_METADATA(fmt)				\
> +	static struct _ddebug descriptor			\
> +	__used							\
> +	__attribute__((section("__verbose"), aligned(8))) =	\
> +	{ KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__,	\
> +		_DPRINTK_FLAGS_DEFAULT };
> +

I think this is unclear and should be:

#define DECLARE_DYNAMIC_DEBUG_METADATA(name, fmt)		\
	static struct _ddebug name				\
	__used							\
	__attribute__((section("__verbose"), aligned(8))) =	\
	{ KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__,	\
		_DPRINTK_FLAGS_DEFAULT }

(extra semicolon at end removed)

so the uses become:

>  #define dynamic_dev_dbg(dev, fmt, ...) do {				\
> -	static struct _ddebug descriptor				\
> -	__used								\
> -	__attribute__((section("__verbose"), aligned(8))) =		\
> -	{ KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__,		\
> -		_DPRINTK_FLAGS_DEFAULT };				\
> +	DYNAMIC_DEBUG_METADATA(fmt);					\

	DECLARE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);

>  	if (unlikely(descriptor.enabled))				\
> -		__dynamic_dev_dbg(&descriptor, dev, fmt, ##__VA_ARGS__);	\
> +		__dynamic_dev_dbg(&descriptor, dev, fmt, ##__VA_ARGS__);\
>  	} while (0)

so then there aren't any magic variable names.

cheers, Joe

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