linux-kernel - Re: [regression] 3.7 ends in APIC panic

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Date:	Mon, 17 Dec 2012 15:02:38 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
Cc:	Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org,
	Borislav Petkov <bp@...en8.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [regression] 3.7 ends in APIC panic


* Bernd Schubert <bernd.schubert@...m.fraunhofer.de> wrote:

> On 12/16/2012 07:07 PM, Yinghai Lu wrote:
> >On Sun, Dec 16, 2012 at 10:01 AM, Bernd Schubert
> ><bernd.schubert@...m.fraunhofer.de> wrote:
> >>>can you post your .config for v3.7 ?
> >>>
> >>>wonder if you have x2apic in .config
> >>
> >>Which setting is it? Config is attached.
> >
> >your config does not have
> >
> >CONFIG_X86_X2APIC=y
> >
> >set.
> >
> >please enable that.
> >
> >your BIOS pre-enable x2apic somehow, so you must have x2apic enabled in kernel.
> >
> >it x2apic really can not be re-enabled by kernel, kernel would disable
> >x2apic automatically.
> 
> The system boots fine with x2apic enabled.
> 
> Thanks a bunch for your help,

I suspect this needs to be fixed/improved: currently it's way 
too easy to disable x2apic support accidentally.

Thanks,

	Ingo
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