From 163363455b42a1cf833742177149d1352dfe673e Mon Sep 17 00:00:00 2001 From: Yafang Shao Date: Tue, 26 Mar 2019 20:13:09 +0800 Subject: [PATCH] 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: Yafang Shao Signed-off-by: Steven Rostedt (VMware) --- include/linux/tracepoint.h | 15 +++++++++++++++ include/trace/define_trace.h | 8 ++++++++ 2 files changed, 23 insertions(+) diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index 9c3186578ce0..86b019aa2839 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -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) */ diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h index cb30c5532144..bd75f97867b9 100644 --- a/include/trace/define_trace.h +++ b/include/trace/define_trace.h @@ -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