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bug.h: Add WARN_RATELIMIT

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[ Upstream commit b3eec79b07 ]

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>
This commit is contained in:
Joe Perches 2011-05-21 07:48:39 +00:00 committed by Greg Kroah-Hartman
parent 386f12d6c8
commit 7cad013caa
1 changed files with 16 additions and 0 deletions
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16
include/asm-generic/bug.h
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@ -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