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tracing: introduce TRACE_EVENT_NOP()

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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: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Yafang Shao 2019-03-26 20:13:09 +08:00 committed by Steven Rostedt (VMware)
parent a8d655792a
commit 163363455b
2 changed files with 23 additions and 0 deletions
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15
include/linux/tracepoint.h
View File

@ -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) */

8
include/trace/define_trace.h
View File

@ -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