[patch 05/61] lock validator: introduce WARN_ON_ONCE(cond)

[Ingo Molnar]

From: Ingo Molnar <mingo@xxxxxxx>

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

Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
---
 include/asm-generic/bug.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

Index: linux/include/asm-generic/bug.h
===================================================================
--- linux.orig/include/asm-generic/bug.h
+++ linux/include/asm-generic/bug.h
@@ -44,4 +44,17 @@
 # define WARN_ON_SMP(x)			do { } while (0)
 #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
-
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