linux-kernel - Re: [PATCH] x86-64: remove locked instruction from switch

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Message-ID: <20090111040557.GG28520@elte.hu>
Date:	Sun, 11 Jan 2009 05:05:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexander van Heukelum <heukelum@...lshack.com>
Subject: Re: [PATCH] x86-64: remove locked instruction from switch_to()


* Benjamin LaHaise <bcrl@...ck.org> wrote:

> Here is a rediffed and test booted version of the patch against linus' git 
> tree as of a couple of hours ago.
> 
> The patch below removes an unnecessary locked instruction from 
> switch_to().  TIF_FORK is only ever set in copy_thread() on initial 
> process creation, and gets cleared during the first scheduling of the 
> process.  As such, it is safe to use an unlocked test for the flag 
> within switch_to()./
> 
> Signed-off-by: Benjamin LaHaise <bcrl@...ck.org>

applied to tip/x86/asm, thanks Ben!

	Ingo
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