linux-kernel - [REGRESSION from 2.6.23-rc8] (was: Re: 2.6.23-rc4-mm1 and -rc6-mm1: boot failure on HP nx6325, related to clockevents)

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Date:	Wed, 26 Sep 2007 23:00:27 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: [REGRESSION from 2.6.23-rc8] (was: Re: 2.6.23-rc4-mm1 and -rc6-mm1: boot failure on HP nx6325, related to clockevents)

On Wednesday, 26 September 2007 21:49, Rafael J. Wysocki wrote:
> On Wednesday, 26 September 2007 20:51, Thomas Gleixner wrote:
> > On Wed, 2007-09-26 at 17:25 +0200, Rafael J. Wysocki wrote:
> > > There still are some oddities.
> > > 
> > > First, with the "x86-64: Disable local APIC timer use on AMD systems with C1E"
> > > patch and my collection of suspend patches applied, the box doesn't boot
> > > (the suspend patches don't even thouch the boot code, so they should be
> > > irrelevant here).  However, it boots if patch-2.6.23-rc7-hrt1.patch (adjusted
> > > for 2.6.23-rc8) is applied in addition.  Is this expected?
> > 
> > No. That's odd. It is nothing else than adding "noapictimer" to the
> > kernel command line.
> 
> Seems to be reproducible, though.  I'll investigate further.

So far, the results are the following:

1) current Linus' tree doesn't boot with any command line (regression)

[  Linus, please revert commit e66485d747505e9d960b864fc6c37f8b2afafaf0

   x86-64: Disable local APIC timer use on AMD systems with C1E

   It's not necessary for 2.6.23 and actually kills the box that it's supposed to fix. ]

2) 2.6.23-rc8 w/ the "x86-64: Disable local APIC timer use on AMD systems with C1E"
   patch applied behaves like the current -git

3) 2.6.23-rc8 w/o this patch doesn't boot with either "noapictimer" _or_
   "apicmaintimer"

4) 2.6.22 behaves like 2.6.23-rc8

5) 2.6.23-rc8 with (adjusted) patch-2.6.23-rc7-hrt1.patch boots only with
   "noapictimer"

6) 2.6.23-rc8 with (adjusted) patch-2.6.23-rc7-hrt1.patch and with the
   "x86-64: Disable local APIC timer use on AMD systems with C1E" patch boots
   without any extra command line options

Tested for a couple of times with each kernel, the results seem to be
reproducible 100% of the time.

Greetings,
Rafael
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