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Subject[PATCH 2/5] tracing: New macro to set up initial event flags value
Date
This introduces the new TRACE_EVENT_FLAGS() macro in order
to set up initial event flags value.

This macro must simply follow the definition of a trace event
and take the event name and the flag value as parameters:

TRACE_EVENT(my_event, .....
....
);

TRACE_EVENT_FLAGS(my_event, 1)

This will set up 1 as the initial my_event->flags value.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Jason Baron <jbaron@redhat.com>
---
include/linux/tracepoint.h | 4 ++++
include/trace/ftrace.h | 12 ++++++++++++
2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index a4a90b6..5a6074f 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -234,6 +234,8 @@ do_trace: \
PARAMS(void *__data, proto), \
PARAMS(__data, args))

+#define TRACE_EVENT_FLAGS(event, flag)
+
#endif /* DECLARE_TRACE */

#ifndef TRACE_EVENT
@@ -354,4 +356,6 @@ do_trace: \
assign, print, reg, unreg) \
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))

+#define TRACE_EVENT_FLAGS(event, flag)
+
#endif /* ifdef TRACE_EVENT (see note above) */
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index a9377c0..6f54012 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -82,6 +82,15 @@
TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \

+#undef TRACE_EVENT_FLAGS
+#define TRACE_EVENT_FLAGS(name, value) \
+ static int __init trace_init_flags_##name(void) \
+ { \
+ event_##name.flags = value; \
+ return 0; \
+ } \
+ early_initcall(trace_init_flags_##name);
+
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)


@@ -129,6 +138,9 @@
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))

+#undef TRACE_EVENT_FLAGS
+#define TRACE_EVENT_FLAGS(event, flag)
+
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

/*
--
1.6.2.3


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