linux-kernel - Re: [PATCH 1/2] x86_64: Fold pda into per cpu area v3

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Date:	Wed, 20 Feb 2008 10:57:26 -0800
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>,
	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Andy Whitcroft <apw@...dowen.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Joel Schopp <jschopp@...tin.ibm.com>
Subject: Re: [PATCH 1/2] x86_64: Fold pda into per cpu area v3

Ingo Molnar wrote:
> * Mike Travis <travis@....com> wrote:
> 
>>   * Declare the pda as a per cpu variable. This will move the pda area
>>     to an address accessible by the x86_64 per cpu macros.  
>>     Subtraction of __per_cpu_start will make the offset based from the 
>>     beginning of the per cpu area.  Since %gs is pointing to the pda, 
>>     it will then also point to the per cpu variables and can be 
>>     accessed thusly:
>>
>> 	%gs:[&per_cpu_xxxx - __per_cpu_start]
> 
> randconfig QA on x86.git found a crash on x86.git#testing with 
> nmi_watchdog=2 (config attached) - and i bisected it down to this patch.
> 
> config and crashlog attached. You can pick up x86.git#testing via:
> 
>   http://people.redhat.com/mingo/x86.git/README
> 
> (since i had to hand-merge the patch when integrating it, i've attached 
> the merged version below.)
> 
> 	Ingo
> 

I must need some different test machines as my AMD box does not fail with
either yours or Thomas's configs, and the Intel box complains about the
PCI-e e1000 driver and dies.  I'll see about configuring a new box.

Did you try Eric's patch to see if that fixed the failure?

Thanks,
Mike

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