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From: Thomas Gleixner <tglx@linutronix.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, Andi Kleen <ak@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>
Subject: Re: [REGRESSION from 2.6.23-rc8] (was: Re: 2.6.23-rc4-mm1 and -rc6-mm1: boot failure on HP nx6325, related to clockevents)
Date: Thu, 27 Sep 2007 00:35:01 +0200	[thread overview]
Message-ID: <1190846101.23376.64.camel@chaos> (raw)
In-Reply-To: <alpine.LFD.0.999.0709261521440.3579@woody.linux-foundation.org>

On Wed, 2007-09-26 at 15:22 -0700, Linus Torvalds wrote:
> 
> On Wed, 26 Sep 2007, Thomas Gleixner wrote:
> > > 
> > > 1) current Linus' tree doesn't boot with any command line (regression)
> > > 
> > > [  Linus, please revert commit e66485d747505e9d960b864fc6c37f8b2afafaf0
> 
> Reverted.
> 
> > OK, this explains 2) and 3). I just looked into the code and the logic
> > vs. noapictimer on SMP is completely broken.
> 
> ..and thanks for the explanation.
> 
> Thanks for finding it so quickly guys. Sounds like this will be fixed 
> properly in 2.6.24 with the x86 merge (which hopefully brings in the hrt 
> patch too)

It's even worse than I thought on the first check:

"noapictimer" on the command line of an SMP box prevents _ONLY_ the boot
CPU apic timer from being used. But the secondary CPU is still
unconditionally setting up the APIC timer and uses the non calibrated
variable calibration_result, which is of course 0, to setup the APIC
timer. Wreckage guaranteed.

	tglx



  reply	other threads:[~2007-09-26 22:35 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-09-23 10:57 2.6.23-rc4-mm1 and -rc6-mm1: boot failure on HP nx6325, related to clockevents Rafael J. Wysocki
2007-09-23 19:10 ` Thomas Gleixner
2007-09-23 20:08   ` Rafael J. Wysocki
2007-09-23 19:59     ` Thomas Gleixner
2007-09-23 20:52       ` Rafael J. Wysocki
2007-09-24  8:07         ` Thomas Gleixner
2007-09-24 12:57           ` Rafael J. Wysocki
2007-09-24 13:05             ` Thomas Gleixner
2007-09-24 13:52               ` Rafael J. Wysocki
2007-09-24 14:23                 ` Thomas Gleixner
2007-09-24 15:18                   ` Rafael J. Wysocki
2007-09-24 16:46                     ` Thomas Gleixner
2007-09-24 19:11                       ` Rafael J. Wysocki
2007-09-24 19:13                         ` Thomas Gleixner
2007-09-25 13:16                           ` Rafael J. Wysocki
2007-09-25 13:17                             ` Thomas Gleixner
2007-09-25 20:07                               ` Rafael J. Wysocki
2007-09-25 20:46                                 ` Thomas Gleixner
2007-09-25 21:28                                   ` Rafael J. Wysocki
2007-09-25 21:24                                     ` Thomas Gleixner
2007-09-26 15:25                                       ` Rafael J. Wysocki
2007-09-26 18:51                                         ` Thomas Gleixner
2007-09-26 19:49                                           ` Rafael J. Wysocki
2007-09-26 21:00                                             ` [REGRESSION from 2.6.23-rc8] (was: Re: 2.6.23-rc4-mm1 and -rc6-mm1: boot failure on HP nx6325, related to clockevents) Rafael J. Wysocki
2007-09-26 21:34                                               ` Thomas Gleixner
2007-09-26 22:22                                                 ` Linus Torvalds
2007-09-26 22:35                                                   ` Thomas Gleixner [this message]
2007-09-26 23:30                                                     ` [REGRESSION from 2.6.23-rc8] Chuck Ebbert
2007-09-28 15:07                                                     ` Chuck Ebbert
2007-09-28 15:10                                                       ` Thomas Gleixner
2007-09-30  9:58                                                   ` [REGRESSION from 2.6.23-rc8] (was: Re: 2.6.23-rc4-mm1 and -rc6-mm1: boot failure on HP nx6325, related to clockevents) Andi Kleen
2007-09-30 14:06                                                     ` Thomas Gleixner
2007-09-30 15:03                                                       ` Andi Kleen
2007-09-26 23:30                                                 ` Rafael J. Wysocki
2007-09-26 23:21                                                   ` Thomas Gleixner
2007-09-27 15:58                                                     ` Rafael J. Wysocki
2007-09-30  9:52                                                 ` Andi Kleen

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