linux-kernel - Re: [PATCH 1/4] dynamic_debug: consolidate repetitive struct

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Date:	Thu, 8 Sep 2011 16:52:30 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	gregkh@...e.de, joe@...ches.com, jim.cromie@...il.com,
	bvanassche@....org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dynamic_debug: consolidate repetitive struct
 _ddebug descriptor definitions

On Tue, 30 Aug 2011 14:28:41 -0400
Jason Baron <jbaron@...hat.com> wrote:

> Replace the repetitive struct _ddebug descriptor definitions with
> a new DECLARE_DYNAMIC_DEBUG_META_DATA(name, fmt) macro.
> 
> ...
>
> +#define DECLARE_DYNAMIC_DEBUG_METADATA(name, fmt)		\
> +	static struct _ddebug __used __aligned(8)		\
> +	__attribute__((section("__verbose"))) name = {		\
> +		.modname = KBUILD_MODNAME,			\
> +		.function = __func__,				\
> +		.filename = __FILE__,				\
> +		.format = (fmt),				\
> +		.lineno = __LINE__,				\
> +		.flags =  _DPRINTK_FLAGS_DEFAULT,		\
> +		.enabled = false,				\
> +	}

<anal>That macro implements a definition, not a declaration</anal>

--- a/include/linux/dynamic_debug.h~dynamic_debug-consolidate-repetitive-struct-_ddebug-descriptor-definitions-fix
+++ a/include/linux/dynamic_debug.h
@@ -54,7 +54,7 @@ extern int __dynamic_netdev_dbg(struct _
 			     const char *fmt, ...)
 	__attribute__ ((format (printf, 3, 4)));
 
-#define DECLARE_DYNAMIC_DEBUG_METADATA(name, fmt)		\
+#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt)		\
 	static struct _ddebug __used __aligned(8)		\
 	__attribute__((section("__verbose"))) name = {		\
 		.modname = KBUILD_MODNAME,			\
@@ -68,7 +68,7 @@ extern int __dynamic_netdev_dbg(struct _
 
 #define dynamic_pr_debug(fmt, ...)				\
 do {								\
-	DECLARE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);	\
+	DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);		\
 	if (unlikely(descriptor.enabled))			\
 		__dynamic_pr_debug(&descriptor, pr_fmt(fmt),	\
 				   ##__VA_ARGS__);		\
@@ -76,7 +76,7 @@ do {								\
 
 #define dynamic_dev_dbg(dev, fmt, ...)				\
 do {								\
-	DECLARE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);	\
+	DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);	\
 	if (unlikely(descriptor.enabled))			\
 		__dynamic_dev_dbg(&descriptor, dev, fmt,	\
 				  ##__VA_ARGS__);		\
@@ -84,7 +84,7 @@ do {								\
 
 #define dynamic_netdev_dbg(dev, fmt, ...)			\
 do {								\
-	DECLARE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);	\
+	DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);		\
 	if (unlikely(descriptor.enabled))			\
 		__dynamic_netdev_dbg(&descriptor, dev, fmt,	\
 				     ##__VA_ARGS__);		\
_

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