linux-kernel - [PATCH 2/5] lock_dep: Fix missing entries in /proc/lock

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Date:	Mon, 17 Aug 2009 13:39:49 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/5] lock_dep: Fix missing entries in /proc/lock_chains

Two entries are missing in the output of /proc/lock_chains.

One is chains[1]. When lc_next() is called the 1st time, chains[0] is
returned. And when it's called the 2nd time, chains[2] is returned.

The other missing ons is, when lc_start() is called the 2nd time, we
should start from chains[@pos-1] but not chains[@pos], because pos == 0
is the header.

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 kernel/lockdep_proc.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
index 0c39f18..84c6b1e 100644
--- a/kernel/lockdep_proc.c
+++ b/kernel/lockdep_proc.c
@@ -160,8 +160,8 @@ static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
 	else {
 		chain = v;
 
-		if (*pos < nr_lock_chains)
-			chain = lock_chains + *pos;
+		if (*pos - 1 < nr_lock_chains)
+			chain = lock_chains + (*pos - 1);
 		else
 			chain = NULL;
 	}
@@ -174,8 +174,8 @@ static void *lc_start(struct seq_file *m, loff_t *pos)
 	if (*pos == 0)
 		return SEQ_START_TOKEN;
 
-	if (*pos < nr_lock_chains)
-		return lock_chains + *pos;
+	if (*pos - 1 < nr_lock_chains)
+		return lock_chains + (*pos - 1);
 
 	return NULL;
 }
-- 
1.6.3

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