bug.h: Add WARN_RATELIMIT (b3eec79b) · Commits · 戴 / test

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>

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.

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