linux-kernel - [tip:tracing/core] tracing: Fix uninitialized variable of tracing/trace output

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Message-ID: <tip-aa27497c2fb4c7f57706099bd489e683e5cc3e3b@git.kernel.org>
Date:	Wed, 14 Apr 2010 15:00:39 GMT
From:	tip-bot for Lai Jiangshan <laijs@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	rostedt@...dmis.org, tglx@...utronix.de, laijs@...fujitsu.com
Subject: [tip:tracing/core] tracing: Fix uninitialized variable of tracing/trace output

Commit-ID:  aa27497c2fb4c7f57706099bd489e683e5cc3e3b
Gitweb:     http://git.kernel.org/tip/aa27497c2fb4c7f57706099bd489e683e5cc3e3b
Author:     Lai Jiangshan <laijs@...fujitsu.com>
AuthorDate: Mon, 5 Apr 2010 17:11:05 +0800
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Mon, 5 Apr 2010 11:01:22 -0400

tracing: Fix uninitialized variable of tracing/trace output

Because a local variable is not initialized, I got these
when I did 'cat tracing/trace'. (not trace_pipe):

CPU:0 [LOST 18446744071579453134 EVENTS]
              ps-3099  [000]   560.770221: lock_acquire: ffff880030865010 &(&dentry->d_lock)->rlock
CPU:0 [LOST 18446744071579453134 EVENTS]
              ps-3099  [000]   560.770221: lock_release: ffff880030865010 &(&dentry->d_lock)->rlock
CPU:0 [LOST 18446612133255294080 EVENTS]
              ps-3099  [000]   560.770221: lock_acquire: ffff880030865010 &(&dentry->d_lock)->rlock
CPU:0 [LOST 18446744071579453134 EVENTS]
              ps-3099  [000]   560.770222: lock_release: ffff880030865010 &(&dentry->d_lock)->rlock
CPU:0 [LOST 18446744071579453134 EVENTS]
              ps-3099  [000]   560.770222: lock_release: ffffffff816cfb98 dcache_lock

See peek_next_entry(), it does not set *lost_events when we 'cat tracing/trace'

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
LKML-Reference: <4BB9A929.2000303@...fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/trace/trace.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 0498beb..b9be232 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1571,7 +1571,7 @@ __find_next_entry(struct trace_iterator *iter, int *ent_cpu,
 {
 	struct ring_buffer *buffer = iter->tr->buffer;
 	struct trace_entry *ent, *next = NULL;
-	unsigned long lost_events, next_lost = 0;
+	unsigned long lost_events = 0, next_lost = 0;
 	int cpu_file = iter->cpu_file;
 	u64 next_ts = 0, ts;
 	int next_cpu = -1;
--
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