[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>

1 files changed, 13 insertions, 0 deletions

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