Commit e9d65725 authored Aug 17, 2009 by Li Zefan Committed by Ingo Molnar Aug 17, 2009

lockdep: 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@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <4A88ED25.2040306@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 21227434

kernel/lockdep_proc.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -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;
		}