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

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Date:	Tue, 1 Jul 2008 00:28:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, kernel-testers@...r.kernel.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Pavel Machek <pavel@....cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	stable@...nel.org
Subject: Re: [RFT] x86 acpi: normalize segment descriptor register on resume

On Tue, 1 Jul 2008 09:20:24 +0200 Ingo Molnar <mingo@...e.hu> wrote:

> * Rafael J. Wysocki <rjw@...k.pl> wrote:
> 
> > Hi,
> > 
> > The appended patch fixes a regression and is considered as 2.6.26 
> > material. Everyone having a box with working suspend to RAM is gently 
> > requested to test it and verify if it doesn't break things.
> > 
> > The patch applies to the current -git.
> 
> The fix is _really_ tempting, but i think it's 2.6.26.1 material at the 
> earliest. I just counted about 8 red flag items in that commit:
> 
>   - "assembly code"
>   - "fresh change"
>   - "suspend/resume"
>   - "real-mode code"
>   - "ACPI"
>   - "SMM"
>   - "CPU erratas"
>   - "boot code"
> 
> I'd say it's probably 90% fine, but it's just too much risk at this 
> stage i think. The regression was only found 2 weeks ago, and the commit 
> that broke it was upstream for 2 months (and was under testing for about 
> 4 months).

Merge it into 2.6.27-rc1 and add Cc: <stable@...nel.org> to the changelog with
a note "needed in 2.6.26.x after a couple of weeks testing in mainline" or
something like that.

I expect 2.6.25.x will be maintained for a while yet too...
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