linux-kernel - Re: Regression: unable to boot after commit bd9240a18edf ("x86/apic: Add TSC_DEADLINE quirk due to errata")

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Message-ID: <1511857335.2498.22.camel@intel.com>
Date:   Tue, 28 Nov 2017 16:22:15 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-x86 <x86@...nel.org>,
        tglx@...utronix.de, Len Brown <len.brown@...el.com>,
        "Chen, Yu C" <yu.c.chen@...el.com>
Subject: Re: Regression: unable to boot after commit bd9240a18edf
 ("x86/apic: Add TSC_DEADLINE quirk due to errata") - Surface Pro 4 SKL

On Tue, 2017-11-28 at 09:14 +0100, Peter Zijlstra wrote:
> On Tue, Nov 28, 2017 at 10:08:53AM +0800, Zhang Rui wrote:
> > 
> > Hi, All,
> > 
> > My Surface Pro 4 is unable to boot after 4.12. The symptom is that
> > kernel freezes during boot, and the last message in the screen is
> > loading the initrd image. And I have bisected it to this commit
> > 
> > +//	DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_SKYLAKE_MOBILE,	
> > 0xb2),
> And what microcode version do you run? Have you installed the latest
> microcode package and updated your initrd to include it? My skylake
> is
> running 0xba.

No, I didn't upgrade my microcode.

$ cat /proc/cpuinfo
...
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 78
model name	: Intel(R) Core(TM) i7-6650U CPU @ 2.20GHz
stepping	: 3
microcode	: 0x9e
...

I suppose the problem should be gone if I upgrade the microcode.
But the real problem to me is that the system FREEZES after kernel
upgrade.

thanks,
rui