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

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Date:	Wed, 22 Oct 2008 12:17:07 -0200
From:	"Glauber Costa" <glommer@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Cyrill Gorcunov" <gorcunov@...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

On Wed, Oct 22, 2008 at 12:13 PM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * 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?

It's a Xeon, so probably just weird.

>
>        Ingo
>



-- 
Glauber  Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."
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