Date: Sun, 11 Jan 2009 05:05:57 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Benjamin LaHaise <bcrl@kvack.org>
Cc: linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
       Thomas Gleixner <tglx@linutronix.de>,
       Alexander van Heukelum <heukelum@mailshack.com>
Subject: Re: [PATCH] x86-64: remove locked instruction from switch_to()
Message-ID: <20090111040557.GG28520@elte.hu>
References: <20090110212625.GE13467@kvack.org> <20090110223616.GB16719@elte.hu> <20090111040022.GG13467@kvack.org>
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* Benjamin LaHaise <bcrl@kvack.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@kvack.org>

applied to tip/x86/asm, thanks Ben!

	Ingo
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