linux-kernel - Re: [RFC][PATCH] x86: add memory clobber in switch

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Message-ID: <20080915075434.GB29585@elte.hu>
Date:	Mon, 15 Sep 2008 09:54:34 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [RFC][PATCH] x86: add memory clobber in switch_to()


* Vegard Nossum <vegard.nossum@...il.com> wrote:

> There are more places which have segment register reloads without 
> adding memory clobbers. Should we fix them up? Here's one of them:

yes, i think so.

> >From 5f135687f7730fbdd979b6fb408fd3ca08a0a678 Mon Sep 17 00:00:00 2001
> From: Vegard Nossum <vegard.nossum@...il.com>
> Date: Sun, 14 Sep 2008 18:53:22 +0200
> Subject: [PATCH] x86: add memory clobber in switch_to()
> 
> Segment registers are reloaded, so we should add a memory clobber. The 
> generated assembly code is identical in my tests, but this doesn't 
> mean it is necessarily true for all configurations/compilers.

applied to tip/x86/core, thanks Vegard.

	Ingo
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