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: <20171128081440.mi3nrhxgori75cbs@hirez.programming.kicks-ass.net>
Date:   Tue, 28 Nov 2017 09:14:40 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Zhang Rui <rui.zhang@...el.com>
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, 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.