linux-kernel - [PATCH] Stringify support commas

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Message-ID: <20080420183256.GA11350@Krystal>
Date:	Sun, 20 Apr 2008 14:32:56 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Stringify support commas

#define MYDEF a, b, c

__stringify(MYDEF) should be replaced by "a, b, c", but compilation fails
because the __stringify macro expects only one argument. Fix it by using
variable macro arguments in __stringify and __stringify_1.

Needed in my current NMI safe iret paravirt support work so I can expand
a macro containing assembly code into a string.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC: akpm@...l.org
---
 include/linux/stringify.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6-lttng/include/linux/stringify.h
===================================================================
--- linux-2.6-lttng.orig/include/linux/stringify.h	2008-04-20 14:25:12.000000000 -0400
+++ linux-2.6-lttng/include/linux/stringify.h	2008-04-20 14:25:33.000000000 -0400
@@ -6,7 +6,7 @@
  * converts to "bar".
  */
 
-#define __stringify_1(x)	#x
-#define __stringify(x)		__stringify_1(x)
+#define __stringify_1(x...)	#x
+#define __stringify(x...)	__stringify_1(x)
 
 #endif	/* !__LINUX_STRINGIFY_H */

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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