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SubjectRe: Linux 2.6.27-rc5: System boot regression caused by commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd
Date
On Friday, 29 of August 2008, Rafael J. Wysocki wrote:
> On Friday, 29 of August 2008, Linus Torvalds wrote:
> >
> > Another week (my weeks do seem to be eight days, don't they? Very odd),
> > another -rc.
> >
> > The dirstat pretty much says it all:
> >
> > 43.0% arch/arm/configs/
> > 43.9% arch/arm/
> > 25.5% arch/powerpc/configs/
> > 26.8% arch/powerpc/
> > 73.9% arch/
> > 4.4% drivers/usb/musb/
> > 5.4% drivers/usb/
> > 4.0% drivers/watchdog/
> > 16.0% drivers/
> > 3.5% fs/
> >
> > yeah, the bulk of it is all config updates, and with arm and powerpc
> > leading the pack.
>
> Doesn't boot on my quad core test box, apparently because of an AHCI failure.
>
> Bisecting ...

Bisection turned up commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd as the culprit:

commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd
Author: Yinghai Lu <yhlu.kernel@gmail.com>
Date: Mon Aug 25 00:56:08 2008 -0700

x86: fix HPET regression in 2.6.26 versus 2.6.25, check hpet against BAR, v3

Reverting this commit helps.

The symptom is that AHCI probe fails with this commit applied.

Thanks,
Rafael


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