From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Yafang Shao <laoar.shao@gmail.com>
Subject: [for-next][PATCH 17/19] tracing: introduce TRACE_EVENT_NOP()
Date: Wed, 03 Apr 2019 21:37:38 -0400 [thread overview]
Message-ID: <20190404013745.924402837@goodmis.org> (raw)
In-Reply-To: 20190404013721.023858792@goodmis.org
From: Yafang Shao <laoar.shao@gmail.com>
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>
---
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
--
2.20.1
next prev parent reply other threads:[~2019-04-04 1:38 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 01/19] ring-buffer: Fix ring buffer size in rb_write_something() Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 03/19] tracing: Add tracing error log Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 04/19] tracing: Save the last hist commands associated event name Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 05/19] tracing: Use tracing error_log with hist triggers Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 06/19] tracing: Use tracing error_log with trace event filters Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 07/19] tracing: Use tracing error_log with probe events Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 08/19] tracing: Add trace_array parameter to create_event_filter() Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 09/19] tracing: Have histogram code pass around trace_array for error handling Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 10/19] tracing: Have the error logs show up in the proper instances Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 11/19] selftests/ftrace: Add error_log testcase for probe errors Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 12/19] selftests/ftrace: Move kprobe/uprobe check_error() to test.d/functions Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 13/19] selftests/ftrace: Remove trigger-extended-error-support testcase Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 14/19] selftests/ftrace: Add tracing/error_log testcase Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 15/19] tracing: Add tracing/error_log Documentation Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 16/19] tracing: Add error_log to README Steven Rostedt
2019-04-04 1:37 ` Steven Rostedt [this message]
2019-04-04 1:37 ` [for-next][PATCH 18/19] sched/fair: do not expose some tracepoints to user if CONFIG_SCHEDSTATS is not set Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 19/19] rcu: validate arguments for rcu tracepoints Steven Rostedt
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