linux-kernel - [tip:tracing/urgent] trace_stat: Don't increment @pos in seq start()

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Date:	Wed, 24 Jun 2009 09:46:02 GMT
From:	tip-bot for Li Zefan <lizf@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	lizf@...fujitsu.com, fweisbec@...il.com, rostedt@...dmis.org,
	tglx@...utronix.de, liming.wang@...driver.com, mingo@...e.hu
Subject: [tip:tracing/urgent] trace_stat: Don't increment @pos in seq start()

Commit-ID:  2961bf345fd1b736c3db46cad0f69855f67fbe9c
Gitweb:     http://git.kernel.org/tip/2961bf345fd1b736c3db46cad0f69855f67fbe9c
Author:     Li Zefan <lizf@...fujitsu.com>
AuthorDate: Wed, 24 Jun 2009 09:53:26 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 24 Jun 2009 11:02:51 +0200

trace_stat: Don't increment @pos in seq start()

It's wrong to increment @pos in stat_seq_start(). It causes some
stat entries lost when reading stat file, if the output of the file
is larger than PAGE_SIZE.

Reviewed-by: Liming Wang <liming.wang@...driver.com>
Signed-off-by: Li Zefan <lizf@...fujitsu.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <4A418716.90209@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/trace/trace_stat.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index c006437..e66f5e4 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -199,17 +199,13 @@ static void *stat_seq_start(struct seq_file *s, loff_t *pos)
 	mutex_lock(&session->stat_mutex);
 
 	/* If we are in the beginning of the file, print the headers */
-	if (!*pos && session->ts->stat_headers) {
-		(*pos)++;
+	if (!*pos && session->ts->stat_headers)
 		return SEQ_START_TOKEN;
-	}
 
 	node = rb_first(&session->stat_root);
 	for (i = 0; node && i < *pos; i++)
 		node = rb_next(node);
 
-	(*pos)++;
-
 	return node;
 }
 
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