linux-kernel - Re: [PATCH -tip] x86: do_boot_cpu

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Date:	Wed, 22 Oct 2008 18:17:20 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Glauber Costa <glommer@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Subject: Re: [PATCH -tip] x86: do_boot_cpu - check if we have ESR register

[Ingo Molnar - Wed, Oct 22, 2008 at 04:13:54PM +0200]
| 
| * Cyrill Gorcunov <gorcunov@...il.com> wrote:
| 
| > We should touch ESR register if only we have it.
| > The patch fixes the problem mentoined here
| > 
| > 	http://lkml.org/lkml/2008/10/17/147
| > 
| > Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
| > CC: Glauber Costa <glommer@...il.com>
| 
| > -		apic_write(APIC_ESR, 0);
| > -		apic_read(APIC_ESR);
| > +		if (APIC_INTEGRATED(apic_version[phys_apicid])) {
| > +			apic_write(APIC_ESR, 0);
| > +			apic_read(APIC_ESR);
| > +		}
| 
| i'm wondering - is the server there really that old, that it has no 
| integrated lapic? I.e. it's an i486 SMP box or so? Or perhaps some 
| other, weird SMP box?
| 
| 	Ingo
| 

I was quite wondering too -- it's Xeon server.

>From http://lkml.org/lkml/2008/10/20/34
>> Hardware: Compaq P4 Xeon server, Broadcom CMIC-WS / CIOB-X2 board.
>> Tell me if you need more detailed information.

		- Cyrill -
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