linux-kernel - Re: [git pull] scheduler updates for v2.6.27, phase #2

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Message-Id: <20080724040954.6402e73f.akpm@linux-foundation.org>
Date:	Thu, 24 Jul 2008 04:09:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Daniel Walker <dwalker@...sta.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [git pull] scheduler updates for v2.6.27, phase #2

On Thu, 24 Jul 2008 12:43:13 +0200 Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Mon, 2008-07-21 at 13:16 -0700, Daniel Walker wrote:
> > On Mon, 2008-07-21 at 21:23 +0200, Peter Zijlstra wrote:
> > 
> > > Does this work for you?
> > > 
> > 
> > Yours removed the warning .. I made an alternate one below only compile
> > tested, your choice..
> 
> How about this one - it seems there is a whole scala of new division
> instructions these days... :-)
> 

ain't life grand.

> 
> 
> diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
> index 47ceac9..3c38686 100644
> --- a/kernel/sched_rt.c
> +++ b/kernel/sched_rt.c
> @@ -253,7 +253,7 @@ static int do_balance_runtime(struct rt_rq *rt_rq)
>  
>  		diff = iter->rt_runtime - iter->rt_time;
>  		if (diff > 0) {
> -			do_div(diff, weight);
> +			diff = div_u64((u64)diff, weight);

Can't use div_s64() here?

>  			if (rt_rq->rt_runtime + diff > rt_period)
>  				diff = rt_period - rt_rq->rt_runtime;
>  			iter->rt_runtime -= diff;
> 
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