linux-kernel - Re: [ 05/48] x86_64, switch_to(): Load TLS descriptors before switching DS and ES

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Message-ID: <20150515155334.GC19417@two.firstfloor.org>
Date:	Fri, 15 May 2015 17:53:34 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Willy Tarreau <w@....eu>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [ 05/48] x86_64, switch_to(): Load TLS descriptors before
 switching DS and ES

> 
> v2.6.32.65:arch/x86/kernel/process_64.c:425:    /* Must be after DS reload */
> 
> If this comment is correct then the patch will cause a regression for
> FPU state management.  The comment was introduced by:

Yes I already stated before that these super-risky patches
are not stable material.

-Andi

> 
> commit 0a5ace2ab08d45cd78d7ef0067cdcd5c812ac54f
> Author: Andi Kleen <ak@...e.de>
> Date:   Thu Oct 5 18:47:22 2006 +0200
> 
>     [PATCH] x86-64: Fix FPU corruption
> 
> Ben.
> 
> -- 
> Ben Hutchings
> It is impossible to make anything foolproof because fools are so ingenious.



-- 
ak@...ux.intel.com -- Speaking for myself only.
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