linux-kernel - [tip:tracing/ftrace] ftrace: ensure every event gets an id

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Message-ID: <tip-28bea271e58e429eccfad3d7ee2ad12d6ee015bf@git.kernel.org>
Date:	Fri, 20 Mar 2009 10:19:38 GMT
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, rostedt@...dmis.org, a.p.zijlstra@...llo.nl,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:tracing/ftrace] ftrace: ensure every event gets an id

Commit-ID:  28bea271e58e429eccfad3d7ee2ad12d6ee015bf
Gitweb:     http://git.kernel.org/tip/28bea271e58e429eccfad3d7ee2ad12d6ee015bf
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Thu, 19 Mar 2009 20:26:14 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 20 Mar 2009 10:17:06 +0100

ftrace: ensure every event gets an id

Impact: widen user-space visibe event IDs to all events

Previously only TRACE_EVENT events got ids, because only they
generated raw output which needs to be demuxed from the trace.

In order to provide a unique ID for each event, register everybody,
regardless.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
LKML-Reference: <20090319194233.464914218@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/trace/trace_events_stage_3.h |   15 ++++++++++++++-
 kernel/trace/trace_output.c         |    5 +++++
 2 files changed, 19 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h
index ae2e323..4c26d97 100644
--- a/kernel/trace/trace_events_stage_3.h
+++ b/kernel/trace/trace_events_stage_3.h
@@ -130,7 +130,19 @@ static void ftrace_unreg_event_##call(void)				\
 {									\
 	unregister_trace_##call(ftrace_event_##call);			\
 }									\
-
+									\
+static struct ftrace_event_call event_##call;				\
+									\
+static int ftrace_init_event_##call(void)				\
+{									\
+	int id;								\
+									\
+	id = register_ftrace_event(NULL);				\
+	if (!id)							\
+		return -ENODEV;						\
+	event_##call.id = id;						\
+	return 0;							\
+}
 
 #undef TRACE_FORMAT
 #define TRACE_FORMAT(call, proto, args, fmt)				\
@@ -140,6 +152,7 @@ __attribute__((__aligned__(4)))						\
 __attribute__((section("_ftrace_events"))) event_##call = {		\
 	.name			= #call,				\
 	.system			= __stringify(TRACE_SYSTEM),		\
+	.raw_init		= ftrace_init_event_##call,		\
 	.regfunc		= ftrace_reg_event_##call,		\
 	.unregfunc		= ftrace_unreg_event_##call,		\
 }
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index b451417..19261fd 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -481,6 +481,11 @@ int register_ftrace_event(struct trace_event *event)
 
 	mutex_lock(&trace_event_mutex);
 
+	if (!event) {
+		ret = next_event_type++;
+		goto out;
+	}
+
 	if (!event->type)
 		event->type = next_event_type++;
 	else if (event->type > __TRACE_LAST_TYPE) {
--
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