Message-ID: <45360E99.7020001@intel.com>
Date: Wed, 18 Oct 2006 19:23:05 +0800
From: "bibo,mao" <bibo.mao@intel.com>
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To: Andi Kleen <ak@suse.de>
CC: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86_64 add NX mask for PTE entry
References: <4535F0A4.1090709@intel.com> <200610181258.45176.ak@suse.de>
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Andi Kleen wrote:
> On Wednesday 18 October 2006 11:15, bibo,mao wrote:
>> Hi,
>>     If function change_page_attr_addr calls revert_page to revert
>> to original pte value, mk_pte_phys does not mask NX bit. If NX bit
>> is set on no NX hardware supported x86_64 machine, there is will
>> be RSVD type page fault and system will crash. This patch adds NX
>> mask bit for PTE entry.
> 
> Hmm, weird. I wonder why that didn't trip up earlier. Did you
> actually see that happening? 
I remember previous system worked well on 2.6.12 and 2.6.13 version,
but recently even on older kernel(2.6.9) there will be many times of
page fault error and system crashes at last when rebooting system.

I will paste the oops message tomorrow.

thanks
bibo,mao
> 
> 
> -Andi
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