From: Ingo Molnar <mingo@elte.hu>

Add WARN_ON_ONCE(cond) to print once-per-bootup messages.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 include/asm-generic/bug.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff -puN include/asm-generic/bug.h~lock-validator-introduce-warn_on_oncecond include/asm-generic/bug.h
--- devel/include/asm-generic/bug.h~lock-validator-introduce-warn_on_oncecond	2006-05-29 18:11:12.000000000 -0700
+++ devel-akpm/include/asm-generic/bug.h	2006-05-29 18:11:12.000000000 -0700
@@ -38,4 +38,17 @@
 #endif
 #endif
 
+#define WARN_ON_ONCE(condition)				\
+({							\
+	static int __warn_once = 1;			\
+	int __ret = 0;					\
+							\
+	if (unlikely(__warn_once && (condition))) {	\
+		__warn_once = 0;			\
+		WARN_ON(1);				\
+		__ret = 1;				\
+	}						\
+	__ret;						\
+})
+
 #endif
_