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Commit b3eec79b authored by Joe Perches's avatar Joe Perches Committed by David S. Miller
Browse files

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: default avatarJoe Perches <joe@perches.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8efa8854

include/asm-generic/bug.h

+16 −0
Original line number Diff line number Diff line
@@ -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.