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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>
This commit is contained in:
Li Zefan 2009-08-17 13:39:49 +08:00 committed by Ingo Molnar
parent 212274347f
commit e9d65725bd
1 changed files with 4 additions and 4 deletions
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8
kernel/lockdep_proc.c
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@ -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;
}