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Commit 16336345 authored by Yafang Shao's avatar Yafang Shao Committed by Steven Rostedt (VMware)
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tracing: introduce TRACE_EVENT_NOP() 

Sometimes we want to define a tracepoint as a do-nothing function.
So I introduce TRACE_EVENT_NOP, DECLARE_EVENT_CLASS_NOP and
DEFINE_EVENT_NOP for this kind of usage.

Link: http://lkml.kernel.org/r/1553602391-11926-2-git-send-email-laoar.shao@gmail.com



Signed-off-by: default avatarYafang Shao <laoar.shao@gmail.com>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent a8d65579

include/linux/tracepoint.h

+15 −0
Original line number Diff line number Diff line
@@ -548,4 +548,19 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p) 


#define TRACE_EVENT_PERF_PERM(event, expr...)



#define DECLARE_EVENT_NOP(name, proto, args)				\

	static inline void trace_##name(proto)				\

	{ }								\

	static inline bool trace_##name##_enabled(void)			\

	{								\

		return false;						\

	}



#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print)	\

	DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))



#define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print)

#define DEFINE_EVENT_NOP(template, name, proto, args)			\

	DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))



#endif /* ifdef TRACE_EVENT (see note above) */

include/trace/define_trace.h

+8 −0
Original line number Diff line number Diff line
@@ -46,6 +46,12 @@ 
		assign, print, reg, unreg)			\

	DEFINE_TRACE_FN(name, reg, unreg)



#undef TRACE_EVENT_NOP

#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print)



#undef DEFINE_EVENT_NOP

#define DEFINE_EVENT_NOP(template, name, proto, args)



#undef DEFINE_EVENT

#define DEFINE_EVENT(template, name, proto, args) \

	DEFINE_TRACE(name)
@@ -102,6 +108,8 @@ 
#undef TRACE_EVENT_FN

#undef TRACE_EVENT_FN_COND

#undef TRACE_EVENT_CONDITION

#undef TRACE_EVENT_NOP

#undef DEFINE_EVENT_NOP

#undef DECLARE_EVENT_CLASS

#undef DEFINE_EVENT

#undef DEFINE_EVENT_FN