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Commit c63b7682 authored by Tal Shorer's avatar Tal Shorer Committed by Steven Rostedt
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tracing: Allow disabling compilation of specific trace systems 

Allow a trace events header file to disable compilation of its
trace events by defining the preprocessor macro NOTRACE.

This could be done, for example, according to a Kconfig option.

Link: http://lkml.kernel.org/r/1438432079-11704-3-git-send-email-tal.shorer@gmail.com



Signed-off-by: default avatarTal Shorer <tal.shorer@gmail.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent b86d9371

include/linux/tracepoint.h

+14 −3
Original line number Diff line number Diff line
@@ -111,7 +111,18 @@ extern void syscall_unregfunc(void); 
#define TP_ARGS(args...)	args

#define TP_CONDITION(args...)	args



#ifdef CONFIG_TRACEPOINTS

/*

 * Individual subsystem my have a separate configuration to

 * enable their tracepoints. By default, this file will create

 * the tracepoints if CONFIG_TRACEPOINT is defined. If a subsystem

 * wants to be able to disable its tracepoints from being created

 * it can define NOTRACE before including the tracepoint headers.

 */

#if defined(CONFIG_TRACEPOINTS) && !defined(NOTRACE)

#define TRACEPOINTS_ENABLED

#endif



#ifdef TRACEPOINTS_ENABLED



/*

 * it_func[0] is never NULL because there is at least one element in the array
@@ -234,7 +245,7 @@ extern void syscall_unregfunc(void); 
#define EXPORT_TRACEPOINT_SYMBOL(name)					\

	EXPORT_SYMBOL(__tracepoint_##name)



#else /* !CONFIG_TRACEPOINTS */

#else /* !TRACEPOINTS_ENABLED */

#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \

	static inline void trace_##name(proto)				\

	{ }								\
@@ -266,7 +277,7 @@ extern void syscall_unregfunc(void); 
#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)

#define EXPORT_TRACEPOINT_SYMBOL(name)



#endif /* CONFIG_TRACEPOINTS */

#endif /* TRACEPOINTS_ENABLED */



#ifdef CONFIG_TRACING

/**

include/trace/define_trace.h

+1 −1
Original line number Diff line number Diff line
@@ -86,7 +86,7 @@ 
#undef DECLARE_TRACE

#define DECLARE_TRACE(name, proto, args)



#ifdef CONFIG_EVENT_TRACING

#ifdef TRACEPOINTS_ENABLED

#include <trace/trace_events.h>

#include <trace/perf.h>

#endif