linux-kernel - Re: [PATCH] x86: do_boot_cpu - check for ESR apic register presence before touching

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Date:	Mon, 15 Sep 2008 09:12:37 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Cyrill Gorcunov" <gorcunov@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: do_boot_cpu - check for ESR apic register presence before touching

On Mon, Sep 15, 2008 at 8:05 AM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> We should check first if there is ESR register before read/write it.
>
> Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
> ---
>
> Please review and test if possible. Thanks.
>
> Index: linux-2.6.git/arch/x86/kernel/smpboot.c
> ===================================================================
> --- linux-2.6.git.orig/arch/x86/kernel/smpboot.c        2008-09-14 21:49:36.000000000 +0400
> +++ linux-2.6.git/arch/x86/kernel/smpboot.c     2008-09-15 18:30:37.000000000 +0400
> @@ -893,8 +893,10 @@ do_rest:
>                /*
>                 * Be paranoid about clearing APIC errors.
>                */
> -               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);
> +               }
>        }
>
>        /*
>

maybe unrelated. Do we need to keep apic_version array?

YH
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