From: Thomas Gleixner <tglx@linutronix.de>
To: john stultz <johnstul@us.ibm.com>
Cc: Frans Pop <elendil@planet.nl>,
linux-s390@vger.kernel.org, Roman Zippel <zippel@linux-m68k.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [BUG,2.6.28,s390] Fails to boot in Hercules S/390 emulator
Date: Thu, 12 Mar 2009 08:50:34 +0100 (CET) [thread overview]
Message-ID: <alpine.LFD.2.00.0903120849270.29264@localhost.localdomain> (raw)
In-Reply-To: <1236823066.7680.178.camel@localhost.localdomain>
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
next prev parent reply other threads:[~2009-03-12 7:51 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-08 1:30 Frans Pop
2009-03-08 7:21 ` Frans Pop
2009-03-09 15:04 ` Frans Pop
2009-03-11 1:00 ` john stultz
2009-03-11 9:00 ` Frans Pop
2009-03-11 16:03 ` Frans Pop
2009-03-11 17:05 ` Frans Pop
2009-03-11 19:05 ` Frans Pop
2009-03-12 0:34 ` john stultz
2009-03-12 4:47 ` john stultz
2009-03-12 6:51 ` Frans Pop
2009-03-17 5:15 ` john stultz
2009-03-17 14:39 ` Frans Pop
2009-03-12 0:30 ` john stultz
2009-03-12 0:47 ` john stultz
2009-03-12 1:30 ` Thomas Gleixner
2009-03-12 1:57 ` john stultz
2009-03-12 7:50 ` Thomas Gleixner [this message]
2009-03-12 17:05 ` [BUG,2.6.28,s390] Fails to boot in Hercules S/390 emulator - hang traced Frans Pop
2009-03-13 11:48 ` Frans Pop
2009-03-13 17:34 ` Frans Pop
2009-03-17 5:09 ` john stultz
2009-03-18 2:26 ` john stultz
2009-03-18 2:54 ` john stultz
2009-03-18 9:28 ` Martin Schwidefsky
2009-03-18 12:07 ` Frans Pop
2009-03-18 15:48 ` John Stultz
2009-03-23 0:11 ` Frans Pop
2009-03-23 22:19 ` John Stultz
2009-03-24 8:23 ` Martin Schwidefsky
2009-04-14 22:27 ` [PATCH] Avoid possible endless loop when using jiffies clocksource and ONESHOT mode clockevent john stultz
2009-03-18 15:39 ` [BUG,2.6.28,s390] Fails to boot in Hercules S/390 emulator - hang traced John Stultz
2009-03-10 3:09 ` [BUG,2.6.28,s390] Fails to boot in Hercules S/390 emulator John Stultz
2009-03-10 3:37 ` Frans Pop
2009-03-10 3:38 ` John Stultz
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