linux-kernel - Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

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Message-ID: <4A188A48.5000208@zytor.com>
Date:	Sat, 23 May 2009 16:44:08 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Harald Welte <HaraldWelte@...tech.com>
CC:	lkml@...ethan.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

Hi Harald,

It looks like there might be a problem with the C7-M ... Michael reports
that if he sets LOCK_PREFIX to "lock;" it works, but that shouldn't be
necessary for a uniprocessor.

I'm wondering if we have to revive the OOSTORE hack, or some other
workaround.  It is of course hard for me to track this down since (a) I
don't have access to the CPU documentation, and (b) I work for Intel
now, which limits the amount of time I can realistically spend on this.

	-hpa

[Cc: Alan, who I believed developed the OOSTORE hack back when.]


Michael S. Zick wrote:
> On Fri May 22 2009, H. Peter Anvin wrote:
>> Michael S. Zick wrote:
>>> Same integrated motherboard.
>> Which means same CPU, same BIOS, same motherboard (none of which you're
>> telling us.)
>>
>> cpuinfo and dmidecode would be informative.
>>
> 
> The -09143lk files are posted.
> 
> Download location:
> http://hp-umpc.com/ce1200v
> 
> Details so far today:
> http://forum.netbookuser.com/viewtopic.php?pid=6968#p6968
> 
> Summary:
> HP-2133 (C7-M/CN896) - 09143 - No results - Still up 3 1/2 hours.
> Cloudbook (C7-M/CX700) - 09143 - 45 minutes.
> Cloudbook (C7-M/CX700) - 09143lk - No results - Still up 1 1/2 hours.
> 
> OK - time to look for the missing "memory" in the clobber lists.  ;)
> 

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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