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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 <>
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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