linux-kernel - Re: [PATCH] simplify update_times (avoid jiffies/jiffies

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Message-Id: <20060801.234422.25910237.anemo@mba.ocn.ne.jp>
Date:	Tue, 01 Aug 2006 23:44:22 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	schwidefsky@...glemail.com
Cc:	johnstul@...ibm.com, akpm@...l.org, zippel@...ux-m68k.org,
	clameter@...r.sgi.com, linux-kernel@...r.kernel.org,
	ralf@...ux-mips.org, ak@....de
Subject: Re: [PATCH] simplify update_times (avoid jiffies/jiffies_64
 aliasing problem)

On Mon, 31 Jul 2006 12:36:38 +0200, "Martin Schwidefsky" <schwidefsky@...glemail.com> wrote:
> > --- a/arch/x86_64/kernel/time.c
> > +++ b/arch/x86_64/kernel/time.c
> > @@ -423,7 +423,8 @@ #endif
> >
> >         if (lost > 0) {
> >                 handle_lost_ticks(lost, regs);
> > -               jiffies += lost;
> > +               while (lost--)
> > +                       do_timer(regs);
> >         }
> >
> >  /*
> 
> I think that this is going into the wrong direction. There are a
> number of architectures that call do_timer(regs) in a while loop. It
> would be much nicer if do_timer would get the number of passed ticks
> as an argument. And the "regs" argument to do_timer is just useless.

But normally do_timer() is called just once, isn't it?  These loops
are just for lost ticks, which would be rarely happened.  So I think
tunning for usual case is better.

I agree that the "regs" argument is useless.  Another candidate for
cleanup.

---
Atsushi Nemoto
-
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