2.6.32-longterm review patch. If anyone has any objections, please let us know.
------------------
From: Joe Perches <j...@perches.com>
[ Upstream commit b3eec79b0776e5340a3db75b34953977c7e5086e ]
Add a generic mechanism to ratelimit WARN(foo, fmt, ...) messages
using a hidden per call site static struct ratelimit_state.
Also add an __WARN_RATELIMIT variant to be able to use a specific
struct ratelimit_state.
Signed-off-by: Joe Perches <j...@perches.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
include/asm-generic/bug.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -50,6 +50,22 @@ struct bug_entry {
#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while(0)
#endif
+#define __WARN_RATELIMIT(condition, state, format...) \
+({ \
+ int rtn = 0; \
+ if (unlikely(__ratelimit(state))) \
+ rtn = WARN(condition, format); \
+ rtn; \
+})
+
+#define WARN_RATELIMIT(condition, format...) \
+({ \
+ static DEFINE_RATELIMIT_STATE(_rs, \
+ DEFAULT_RATELIMIT_INTERVAL, \
+ DEFAULT_RATELIMIT_BURST); \
+ __WARN_RATELIMIT(condition, &_rs, format); \
+})
+
/*
* WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
* significant issues that need prompt attention if they should ever
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