[tip:core/locking] lockdep/proc: Fix lock-time avg computation
From: tip-bot for Peter Zijlstra
Date: Mon Nov 11 2013 - 12:52:59 EST
Commit-ID: 838cc7b488f89ee642fd8336e8e1b620c8c3ece2
Gitweb: http://git.kernel.org/tip/838cc7b488f89ee642fd8336e8e1b620c8c3ece2
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Wed, 6 Nov 2013 17:42:30 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 11 Nov 2013 12:41:34 +0100
lockdep/proc: Fix lock-time avg computation
> kernel/locking/lockdep_proc.c: In function 'seq_lock_time':
> >> kernel/locking/lockdep_proc.c:424:23: warning: comparison of distinct pointer types lacks a cast [enabled by default]
>
> 418 static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
> 419 {
> 420 seq_printf(m, "%14lu", lt->nr);
> 421 seq_time(m, lt->min);
> 422 seq_time(m, lt->max);
> 423 seq_time(m, lt->total);
> > 424 seq_time(m, lt->nr ? do_div(lt->total, lt->nr) : 0);
> 425 }
My compiler refuses to actually say that; but it looks wrong in that
do_div() returns the remainder, not the divisor.
Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Tested-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Davidlohr Bueso <davidlohr@xxxxxx>
Link: http://lkml.kernel.org/r/20131106164230.GE16117@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/locking/lockdep_proc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/locking/lockdep_proc.c b/kernel/locking/lockdep_proc.c
index 0922065..ef43ac4 100644
--- a/kernel/locking/lockdep_proc.c
+++ b/kernel/locking/lockdep_proc.c
@@ -421,7 +421,7 @@ static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
seq_time(m, lt->min);
seq_time(m, lt->max);
seq_time(m, lt->total);
- seq_time(m, lt->nr ? do_div(lt->total, lt->nr) : 0);
+ seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0);
}
static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
--
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