From: Ingo Molnar <[email protected]>
add WARN_ON_ONCE(cond) to print once-per-bootup messages.
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Arjan van de Ven <[email protected]>
---
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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