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] [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 0cd9711895faa..845cb67ad8ea5 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
--
2.30.2