linux-kernel - Re: [PATCH -mm] Fix faulty HPET clocksource usage (fix for bug #7062)

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Message-Id: <1156802255.16398.8.camel@localhost.localdomain>
Date:	Mon, 28 Aug 2006 14:57:35 -0700
From:	john stultz <johnstul@...ibm.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	lkml <linux-kernel@...r.kernel.org>, michael.olbrich@....net
Subject: Re: [PATCH -mm] Fix faulty HPET clocksource usage (fix for bug
	#7062)

On Mon, 2006-08-28 at 14:39 -0700, Andrew Morton wrote:
> On Mon, 28 Aug 2006 14:32:39 -0700
> john stultz <johnstul@...ibm.com> wrote:
> 
> > Apparently some systems export valid HPET addresses, but hpet_enable()
> > fails. Then when the HPET clocksource starts up, it only checks for a
> > valid HPET address, and the result is a system where time does not
> > advance.
> > 
> > See http://bugme.osdl.org/show_bug.cgi?id=7062 for details.
> > 
> > This patch just makes sure we better check that the HPET is functional
> > before registering the HPET clocksource.
> > 
> > Signed-off-by: John Stultz <johnstul@...ibm.com>
> > 
> > diff --git a/arch/i386/kernel/hpet.c b/arch/i386/kernel/hpet.c
> > index c6737c3..17647a5 100644
> > --- a/arch/i386/kernel/hpet.c
> > +++ b/arch/i386/kernel/hpet.c
> > @@ -35,7 +35,7 @@ static int __init init_hpet_clocksource(
> >  	void __iomem* hpet_base;
> >  	u64 tmp;
> >  
> > -	if (!hpet_address)
> > +	if (!is_hpet_enabled())
> >  		return -ENODEV;
> >  
> >  	/* calculate the hpet address: */
> 
> Thanks.   This would be a 2.6.18 thing, wouldn't it?

I would think so.

thanks
-john


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