linux-kernel - Re: Andi, you broke my laptop :-)

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Date:	Thu, 10 May 2007 17:25:07 +0300
From:	Benny Halevy <bhalevy@...asas.com>
To:	Andi Kleen <andi@...stfloor.org>,
	Joerg Roedel <joerg.roedel@....com>
CC:	Pete Zaitcev <zaitcev@...hat.com>, ak@...e.de,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: Andi, you broke my laptop :-)

Joerg's patch works for me too.

Thanks,

Benny

Andi Kleen wrote:
> On Thu, May 10, 2007 at 03:35:56PM +0200, Joerg Roedel wrote:
>> On Thu, May 10, 2007 at 03:01:44PM +0200, Andi Kleen wrote:
>>> On Wed, May 09, 2007 at 12:56:16PM -0700, Pete Zaitcev wrote:
>>>> Hi, Andi:
>>>>
>>>> The attached patch (actually, git show output) makes my Dell 1501 to hang
>>>> on boot. Sorry, I have no clue why... The culprit is found with git bisect.
>>>> But yes, it's an AMD MK-36. I use an x86_64 kernel. It is 100% reproducible.
>>> MK-36? Does it have SVM? 
>>>
>>> Anyways we previously had issues with this being miscompiled, but 
>>> I thought the latest patch should have been ok. What compiler do you use?
>>>
>>> Can you send me a disassembly listing of arch/x86_64/kernel/time.o?
>> I debugged this problem a bit and my compiler[1]interprets the =A
>> constraint as %rax instead of %edx:%eax on x86_64 which causes the
>> problem. The appended patch provides a workaround for this and fixed the
>> hang on my machine.
> 
> Hmm yes now I can reproduce it too. I didn't see any hangs so i suppose 
> my (and that of most -mm tester's) compiled binary always happened to have a 
> suitable value in edx
> 
> Thanks for the patch.
> 
> -Andi
> -
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-- 
Benny Halevy
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