linux-kernel - Re: [PATCH 2/2] um: Disable CONFIG_CMPXCHG

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Message-ID: <BANLkTikJ-7vHBBWSdTcz4mtB2ERqfn3D6g@mail.gmail.com>
Date:	Wed, 13 Apr 2011 15:56:26 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Richard Weinberger <richard@....at>
Cc:	akpm@...ux-foundation.com, slyich@...il.com,
	linux-kernel@...r.kernel.org, jdike@...toit.com,
	user-mode-linux-devel@...ts.sourceforge.net,
	Christoph Lameter <cl@...ux.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 2/2] um: Disable CONFIG_CMPXCHG_LOCAL

On Wed, Apr 13, 2011 at 3:41 PM, Richard Weinberger <richard@....at> wrote:
> Commit 8a5ec0ba "Lockless (and preemptless) fastpaths for slub"
> makes use of this_cpu_cmpxchg_double() which needs
> this_cpu_cmpxchg16b_emu() on x86_64.
> Implementing cmpxchg16b emulation for UML would introduce
> too much complexity. So just disable it.
>
> LKML-Reference: <20110412192014.GF16342@....dyndns.org>
> Reported-by: Sergei Trofimovich <slyich@...il.com>
> Signed-off-by: Richard Weinberger <richard@....at>

Acked-by: Pekka Enberg <penberg@...nel.org>
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