From: Ingo Molnar <mingo@elte.hu>
Date: Sun, 25 Jun 2006 12:48:09 +0000 (-0700)
Subject: [PATCH] introduce WARN_ON_ONCE(cond)
X-Git-Tag: v2.6.18-rc1~967
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=74bb6a09b2e1e69d91eb6069eb4a7f0c06b84812;p=linux-2.6

[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>
---

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 0cd9711895..845cb67ad8 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