linux-kernel - Re: [PATCH] x86_64: clear IO_APIC before enabing apic error vector. v2

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Date:	Wed, 2 Jan 2008 01:17:14 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: clear IO_APIC before enabing apic error
	vector. v2

On Sun, Dec 30, 2007 at 04:56:35PM -0800, Yinghai Lu wrote:
> On Dec 30, 2007 4:28 PM, Adrian Bunk <bunk@...nel.org> wrote:
>...
> > Sorry for the dumb question, but what in
> >
> > +       if (!smp_processor_id() && !skip_ioapic_setup && nr_ioapics)
> > +               enable_IO_APIC();
> >
> > guarantees that this call doesn't happen when you hotplug CPU 0 ?
> 
> so we can hotplug cpu0 or the bsp?

Honestly I don't know the amd64 architecture well enough for telling 
whether the hardware allows it or not.

> YH

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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