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SubjectRe: [Regression] Negative time on Acer Ferrari One with current -git
Date
On Saturday 22 May 2010, Rafael J. Wysocki wrote:
> On Saturday 22 May 2010, Thomas Gleixner wrote:
> > On Sat, 22 May 2010, Thomas Gleixner wrote:
> >
> > > On Sat, 22 May 2010, Rafael J. Wysocki wrote:
> > > > On Saturday 22 May 2010, Thomas Gleixner wrote:
> > > >
> > > > > Also which clocksource is used ?
> > > >
> > > > hpet
> > >
> > > Hmm, there is only one hpet related commit sin .34: 30a564be9d
> > > and I can hardly see how this should be related.
> >
> > Does the problem persist if you disable HPET on the kernel command line ?
>
> I didn't try that, but I bisected it in the meantime which lead to:
>
> commit 64ce4c2f5252f25798117fa80a027993163d6d84
> Author: John Stultz <johnstul@us.ibm.com>
> Date: Thu Mar 11 14:04:47 2010 -0800
>
> time: Clean up warp_clock()
>
> warp_clock() currently accesses timekeeping internal state directly, which
> is unnecessary. Convert it to use the proper timekeeping interfaces.
>
> Signed-off-by: John Stultz <johnstul@us.ibm.com>
> Cc: Ingo Molnar <mingo@elte.hu>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
> So I don't think it's an hpet issue. :-)
>
> I'm now going to revert that commit and see what happens.

After reverting commit 64ce4c2f above things work again.

To be precise, I reverted both commit 64ce4c2f and commit 6a867a3 (time:
Remove xtime_cache), but since the symptoms continued to apprear after
reverting the latter alone, it's quite clear that commit 64ce4c2f breaks things
on this box.

Thanks,
Rafael


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