linux-kernel - Re: [PATCH 7/8] x86/mrst: add nop functions to x86

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Message-ID: <alpine.LFD.2.00.1005170044430.3368@localhost.localdomain>
Date:	Mon, 17 May 2010 00:44:59 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...ux.intel.com>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 7/8] x86/mrst: add nop functions to x86_init mpparse
 functions

On Fri, 14 May 2010, Jacob Pan wrote:

> Moorestown does not have BIOS provided MP tables, we can save some time
> by avoiding scaning of these tables. e.g.
> [    0.000000] Scan SMP from c0000000 for 1024 bytes.
> [    0.000000] Scan SMP from c009fc00 for 1024 bytes.
> [    0.000000] Scan SMP from c00f0000 for 65536 bytes.
> [    0.000000] Scan SMP from c00bfff0 for 1024 bytes.
> 
> Searching EBDA with the base at 0x40E will also result in random pointer
> deferencing within 1MB. This can be a problem in Lincroft if the pointer
> hits VGA area and VGA mode is not enabled.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>

Acked-by: Thomas Gleixner <tglx@...utronix.de>

> ---
>  arch/x86/kernel/mrst.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kernel/mrst.c b/arch/x86/kernel/mrst.c
> index 83c23d6..9b62d32 100644
> --- a/arch/x86/kernel/mrst.c
> +++ b/arch/x86/kernel/mrst.c
> @@ -311,4 +311,9 @@ void __init x86_mrst_early_setup(void)
>  	x86_init.pci.fixup_irqs = x86_init_noop;
>  
>  	legacy_pic = &null_legacy_pic;
> +
> +	/* Avoid searching for BIOS MP tables */
> +	x86_init.mpparse.find_smp_config = x86_init_noop;
> +	x86_init.mpparse.get_smp_config = x86_init_uint_noop;
> +
>  }
> -- 
> 1.6.3.3
> 
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