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Date:   Wed, 20 Dec 2017 15:48:06 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Zhang Rui <rui.zhang@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, linux-x86 <x86@...nel.org>,
        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 Wed, Dec 20, 2017 at 10:08:21PM +0800, Zhang Rui wrote:

> > Does this help?
> > 
> No.

Bah!, does this at least get you a IRQ0 line in /proc/interrupts?

> > diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
> > index 749d189f8cd4..45675072771c 100644
> > --- a/arch/x86/kernel/time.c
> > +++ b/arch/x86/kernel/time.c
> > @@ -69,8 +69,6 @@ static struct irqaction irq0  = {
> >  
> >  static void __init setup_default_timer_irq(void)
> >  {
> > -	if (!nr_legacy_irqs())
> > -		return;
> >  	setup_irq(0, &irq0);
> >  }
> >  

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