linux-kernel - Re: [PATCH 0/5] i387: stable kernel backport

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Message-ID: <4F456D8F.1080801@zytor.com>
Date:	Wed, 22 Feb 2012 14:34:55 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Raphael Prevost <raphael@...o.asia>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/5] i387: stable kernel backport

On 02/22/2012 12:54 PM, Linus Torvalds wrote:
> 
> This is a reasonably minimal backport of the i387 state save/restore bug.
> 
> A few of the commits are just minimal "make it easier to backport" commits 
> that don't necessarily fix anything on their own.  And a few of the others 
> are combinations of what is two commits in the development tree, because 
> it turned out to be easier and cleaner that way.
> 
> The last one is the one that fixes the x86-32 bug, but the preemption 
> fixes are real fixes too, although they are probably not something that 
> anybody has necessarily ever hit in reality because the race window is so 
> small.  Even so, if the fix itself isn't that important, the "make it 
> easier to backport the main one" would still be a big argument for it.
> 
> I *really* hope that the people who could reproduce this bug will test the 
> back-port series too, since I never actually saw the bug personally to 
> begin with. And again, big thanks to Raphael who helped pinpoint and debug 
> this.
> 

Okay, this patchset does *NOT* work.  It fails immediately on my system.
 I hadn't ever seen it fail so fast.

	-hpa

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

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