linux-kernel - Re: [RFT] x86 acpi: normalize segment descriptor register on resume

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Message-ID: <486A6950.6050507@zytor.com>
Date:	Tue, 01 Jul 2008 10:28:48 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	kernel-testers@...r.kernel.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Pavel Machek <pavel@....cz>
Subject: Re: [RFT] x86 acpi: normalize segment descriptor register on resume

Andi Kleen wrote:
> H. Peter Anvin wrote:
>> Andi Kleen wrote:
>>>> It still seems incredibly risky to push this for 2.6.26, especially
>>>> given the Elan revelation.
>>> Do Elans even support S3?
>> I don't know if they do, but I don't know offhand the extent of machines
>> that may have that problem, especially since Intel now document it as
>> "failures are readily seen".
> 
> What document is that exactly?
> 

Per Jeremy's recent email, volume 3a, section 8.9.1:

>    Random failures can occur if other instructions exist between steps
>    3 and 4 above.  Failures will be readily seen in some situations,
>    such as when instructions that reference memory are inserted between
>    steps 3 and 4 while in system management mode. 

	-hpa
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