linux-kernel - Re: [PATCH] sched: fix the wrong mask

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Date:	Fri, 17 Oct 2008 12:33:04 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	miaox@...fujitsu.com, Ingo Molnar <mingo@...e.hu>,
	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: fix the wrong mask_len

On Fri, 2008-10-17 at 19:25 +0900, KOSAKI Motohiro wrote:
> > If the NR_CPUS isn't a multiple of 32, we get a truncated string of sched
> > domains by catting /proc/schedstat. This is caused by the wrong mask_len.
> > 
> > This patch fix it.
> > 
> > Signed-off-by: Miao Xie <miaox@...fujitsu.com>
> > 
> > ---
> >  kernel/sched_stats.h |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
> > index 8385d43..81365b3 100644
> > --- a/kernel/sched_stats.h
> > +++ b/kernel/sched_stats.h
> > @@ -9,7 +9,7 @@
> >  static int show_schedstat(struct seq_file *seq, void *v)
> >  {
> >  	int cpu;
> > -	int mask_len = NR_CPUS/32 * 9;
> > +	int mask_len = (NR_CPUS/32 + 1) * 9;
> >  	char *mask_str = kmalloc(mask_len, GFP_KERNEL);
> >  
> 
> DIV_ROUND_UP() is better?

Agreed

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