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laoarrostedt
laoar
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rostedt
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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 <laoar.shao@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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‎include/linux/tracepoint.h‎

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@@ -548,4 +548,19 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
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#define TRACE_EVENT_PERF_PERM(event, expr...)
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#define DECLARE_EVENT_NOP(name, proto, args) \
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static inline void trace_##name(proto) \
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{ } \
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static inline bool trace_##name##_enabled(void) \
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{ \
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return false; \
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}
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#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \
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DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
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#define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print)
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#define DEFINE_EVENT_NOP(template, name, proto, args) \
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DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
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#endif /* ifdef TRACE_EVENT (see note above) */

‎include/trace/define_trace.h‎

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@@ -46,6 +46,12 @@
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assign, print, reg, unreg) \
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DEFINE_TRACE_FN(name, reg, unreg)
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#undef TRACE_EVENT_NOP
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#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print)
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#undef DEFINE_EVENT_NOP
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#define DEFINE_EVENT_NOP(template, name, proto, args)
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, name, proto, args) \
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DEFINE_TRACE(name)
@@ -102,6 +108,8 @@
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#undef TRACE_EVENT_FN
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#undef TRACE_EVENT_FN_COND
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#undef TRACE_EVENT_CONDITION
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#undef TRACE_EVENT_NOP
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#undef DEFINE_EVENT_NOP
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#undef DECLARE_EVENT_CLASS
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#undef DEFINE_EVENT
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#undef DEFINE_EVENT_FN

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