linux-kernel - Re: [Regression] Negative time on Acer Ferrari One with current -git

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Message-Id: <201005222255.27301.rjw@sisk.pl>
Date:	Sat, 22 May 2010 22:55:27 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	John Stultz <johnstul@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Regression] Negative time on Acer Ferrari One with current -git

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@...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@...ibm.com>
    Cc: Ingo Molnar <mingo@...e.hu>
    Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
    Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

So I don't think it's an hpet issue. :-)

I'm now going to revert that commit and see what happens.

Thanks,
Rafael
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