linux-kernel - Re: [slubllv7 04/17] x86: Add support for cmpxchg

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Date:	Thu, 09 Jun 2011 12:53:43 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <cl@...ux.com>
CC:	David Rientjes <rientjes@...gle.com>, tj@...nel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...e.hu
Subject: Re: [slubllv7 04/17] x86: Add support for cmpxchg_double

On 6/1/11 8:25 PM, Christoph Lameter wrote:
> A simple implementation that only supports the word size and does not
> have a fallback mode (would require a spinlock).
>
> Add 32 and 64 bit support for cmpxchg_double. cmpxchg double uses
> the cmpxchg8b or cmpxchg16b instruction on x86 processors to compare
> and swap 2 machine words. This allows lockless algorithms to move more
> context information through critical sections.
>
> Set a flag CONFIG_CMPXCHG_DOUBLE to signal that support for double word
> cmpxchg detection has been build into the kernel. Note that each subsystem
> using cmpxchg_double has to implement a fall back mechanism as long as
> we offer support for processors that do not implement cmpxchg_double.
>
> Reviewed-by: H. Peter Anvin<hpa@...or.com>
> Cc: tj@...nel.org
> Signed-off-by: Christoph Lameter<cl@...ux.com>

Tejun, I'm going to queue this series for linux-next in the next few 
days. Could you either pick up this patch so I can pull from your tree 
or alternatively, is it OK to queue this through slab.git?

			Pekka
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