From 74bb6a09b2e1e69d91eb6069eb4a7f0c06b84812 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Sun, 25 Jun 2006 05:48:09 -0700
Subject: [PATCH] introduce WARN_ON_ONCE(cond)

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

[rostedt@goodmis.org: improve code generation]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 include/asm-generic/bug.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 0cd9711895fa..845cb67ad8ea 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -38,4 +38,17 @@
 #endif
 #endif
 
+#define WARN_ON_ONCE(condition)				\
+({							\
+	static int __warn_once = 1;			\
+	int __ret = 0;					\
+							\
+	if (unlikely((condition) && __warn_once)) {	\
+		__warn_once = 0;			\
+		WARN_ON(1);				\
+		__ret = 1;				\
+	}						\
+	__ret;						\
+})
+
 #endif
-- 
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