From: Andi Kleen <ak@suse.de>
To: dan.yeisley@unisys.com
Subject: Re: [patch] i386 need to pass virtual address to smp_read_mpc()
Date: Fri, 17 Feb 2006 21:55:34 +0100
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On Friday 17 February 2006 21:24, Daniel Yeisley wrote:
> I'm seeing a kernel panic on an ES7000-600 when booting in virtual wire
> mode.  The panic happens because smp_read_mpc() is passed a physical
> address, and it should be virtual.  I tested the attached patch on the
> ES7000-600 and on a 2 cpu Dell box, and saw no problems on either.
> 
> Signed-off-by:  Dan Yeisley <dan.yeisley@unisys.com>
> ---
> 
> diff -Naur -p linux-2.6.16-rc1-git3-7/arch/i386/kernel/mpparse.c linux-2.6.16-rc1-git3-7-a/arch/i386/kernel/mpparse.c
> --- linux-2.6.16-rc1-git3-7/arch/i386/kernel/mpparse.c  2006-01-30 18:38:18.000000000 -0500
> +++ linux-2.6.16-rc1-git3-7-a/arch/i386/kernel/mpparse.c        2006-02-16 04:51:35.551014272 -0500
> @@ -710,7 +710,7 @@ void __init get_smp_config (void)
>                  * Read the physical hardware table.  Anything here will
>                  * override the defaults.
>                  */
> -               if (!smp_read_mpc((void *)mpf->mpf_physptr)) {
> +               if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr)))


Actually the patch is broken. Andrew, if you merge it please add the missing { here.

Dan, please only submit patches that are compile tested at least.

-Andi


>                         smp_found_config = 0;
>                         printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
>                         printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
> 
> 
> 
-
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