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authorYafang Shao <laoar.shao@gmail.com>2019-03-26 15:13:09 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-04-08 16:22:51 +0300
commit163363455b42a1cf833742177149d1352dfe673e (patch)
tree456d1d7fcd0b6e960f192ee1f25d193de68db280 /include/linux/tracepoint.h
parenta8d655792a32312f6715ac789b860fee50168106 (diff)
downloadlinux-163363455b42a1cf833742177149d1352dfe673e.tar.xz
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>
Diffstat (limited to 'include/linux/tracepoint.h')
-rw-r--r--include/linux/tracepoint.h15
1 files changed, 15 insertions, 0 deletions
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) */