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bug.h: Add WARN_RATELIMIT 

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>
This commit is contained in:
Joe Perches 2011-05-21 07:48:39 +00:00 committed by David S. Miller
parent 8efa885406
commit b3eec79b07
1 changed files with 16 additions and 0 deletions
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16
include/asm-generic/bug.h
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@ -165,6 +165,22 @@ extern void warn_slowpath_null(const char *file, const int line);
#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.