Messages in this thread Patch in this message | | | From | Yafang Shao <> | Subject | [PATCH 1/3] tracing: introduce TRACE_EVENT_NONE() | Date | Tue, 26 Mar 2019 09:40:05 +0800 |
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Sometimes we want define a tracepoint as a do-nothing function. So I introduce this TRACE_EVENT_NONE() for this kind of usage.
Signed-off-by: Yafang Shao <laoar.shao@gmail.com> --- include/linux/tracepoint.h | 8 ++++++++ include/trace/define_trace.h | 4 ++++ 2 files changed, 12 insertions(+)
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index 9c31865..d00c5e6 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -548,4 +548,12 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p) #define TRACE_EVENT_PERF_PERM(event, expr...) +#define TRACE_EVENT_NONE(name, proto) \ + static inline void trace_##name(proto) \ + { } \ + static inline bool trace_##name##_enabled(void) \ + { \ + return false; \ + } + #endif /* ifdef TRACE_EVENT (see note above) */ diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h index cb30c55..a833b6f 100644 --- a/include/trace/define_trace.h +++ b/include/trace/define_trace.h @@ -46,6 +46,9 @@ assign, print, reg, unreg) \ DEFINE_TRACE_FN(name, reg, unreg) +#undef TRACE_EVENT_NONE +#define TRACE_EVENT_NONE(name, proto) + #undef DEFINE_EVENT #define DEFINE_EVENT(template, name, proto, args) \ DEFINE_TRACE(name) @@ -102,6 +105,7 @@ #undef TRACE_EVENT_FN #undef TRACE_EVENT_FN_COND #undef TRACE_EVENT_CONDITION +#undef TRACE_EVENT_NONE #undef DECLARE_EVENT_CLASS #undef DEFINE_EVENT #undef DEFINE_EVENT_FN -- 1.8.3.1
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