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Subject[005/107] bug.h: Add WARN_RATELIMIT
2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Joe Perches <joe@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 <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@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
@@ -165,6 +165,22 @@ extern void warn_slowpath_null(const cha
#define WARN_ON_RATELIMIT(condition, state) \
WARN_ON((condition) && __ratelimit(state))

+#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_ON_SMP() is for cases that the warning is either
* meaningless for !SMP or may even cause failures.



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