linux-kernel - [PATCH 2/9] perf: Fix initialization bug in parse_single_tracepoint

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Message-Id: <1272074742-3654-3-git-send-regression-fweisbec@gmail.com>
Date:	Sat, 24 Apr 2010 04:05:35 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 2/9] perf: Fix initialization bug in parse_single_tracepoint_event()

From: Stephane Eranian <eranian@...gle.com>

The parse_single_tracepoint_event() was setting some attributes
before it validated the event was indeed a tracepoint event. This
caused problems with other initialization routines like in the
builtin-top.c module whereby sample_period is not set if not 0.

Signed-off-by: Stephane Eranian <eranian@...gle.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Ingo Molnar <mingo@...e.hu>
LKML-Reference: <4bcf232b.698fd80a.6fbe.ffffb737@...google.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 tools/perf/util/parse-events.c |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 3b4ec67..600d327 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -418,12 +418,6 @@ parse_single_tracepoint_event(char *sys_name,
 	u64 id;
 	int fd;
 
-	attr->sample_type |= PERF_SAMPLE_RAW;
-	attr->sample_type |= PERF_SAMPLE_TIME;
-	attr->sample_type |= PERF_SAMPLE_CPU;
-
-	attr->sample_period = 1;
-
 	snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
 		 sys_name, evt_name);
 
@@ -442,6 +436,13 @@ parse_single_tracepoint_event(char *sys_name,
 	attr->type = PERF_TYPE_TRACEPOINT;
 	*strp = evt_name + evt_length;
 
+	attr->sample_type |= PERF_SAMPLE_RAW;
+	attr->sample_type |= PERF_SAMPLE_TIME;
+	attr->sample_type |= PERF_SAMPLE_CPU;
+
+	attr->sample_period = 1;
+
+
 	return EVT_HANDLED;
 }
 
-- 
1.6.2.3

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