linux-kernel - Re: [BUG,2.6.28,s390] Fails to boot in Hercules S/390 emulator

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Date:	Thu, 12 Mar 2009 08:50:34 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	john stultz <johnstul@...ibm.com>
cc:	Frans Pop <elendil@...net.nl>, linux-s390@...r.kernel.org,
	Roman Zippel <zippel@...ux-m68k.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG,2.6.28,s390] Fails to boot in Hercules S/390 emulator

On Wed, 11 Mar 2009, john stultz wrote:
> Maybe a different way of expressing what we're calculating is the
> following:
> 
> xtime.tv_nsec = (clock->xtime_nsec + (1<<clock->shift)) >> clock->shift
> clock->xtime_nsec = (1<<clock->shift) 
> 			- (clock->xtime_nsec &((1<<clock->shift)-1)
> 
> In other words: The rounded up portion - the masked remainder in
> xtime_nsec.
> 
> Does that make sense?

Yes, now that my brain works again. I knew I was missing something.

You are definitely right: math _is_ hard :)

    tglx
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