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Commit 7cb2e3ee authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
Browse files

tracing: add comments to explain TRACE_EVENT out of protection 



The commit:
  commit 5ac35daa
  Author: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
  tracing/events: fix the include file dependencies

Moved the TRACE_EVENT out of the ifdef protection of tracepoints.h
but uses the define of TRACE_EVENT itself as protection. This patch
adds comments to explain why.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 5ac35daa

include/linux/tracepoint.h

+11 −2
Original line number Diff line number Diff line
@@ -180,7 +180,15 @@ static inline void tracepoint_synchronize_unregister(void) 
}



#define PARAMS(args...) args

#endif



#endif /* _LINUX_TRACEPOINT_H */



/*

 * Note: we keep the TRACE_EVENT outside the include file ifdef protection.

 *  This is due to the way trace events work. If a file includes two

 *  trace event headers under one "CREATE_TRACE_POINTS" the first include

 *  will override the TRACE_EVENT and break the second include.

 */



#ifndef TRACE_EVENT

/*
@@ -287,4 +295,5 @@ static inline void tracepoint_synchronize_unregister(void) 


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

	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))

#endif
 


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