From: Pekka Enberg <penberg@kernel.org>
To: Richard Weinberger <richard@nod.at>
Cc: akpm@linux-foundation.com, slyich@gmail.com,
linux-kernel@vger.kernel.org, jdike@addtoit.com,
user-mode-linux-devel@lists.sourceforge.net,
Christoph Lameter <cl@linux.com>, Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH 2/2] um: Disable CONFIG_CMPXCHG_LOCAL
Date: Wed, 13 Apr 2011 15:56:26 +0300 [thread overview]
Message-ID: <BANLkTikJ-7vHBBWSdTcz4mtB2ERqfn3D6g@mail.gmail.com> (raw)
In-Reply-To: <1302698512-11979-2-git-send-email-richard@nod.at>
On Wed, Apr 13, 2011 at 3:41 PM, Richard Weinberger <richard@nod.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@mtj.dyndns.org>
> Reported-by: Sergei Trofimovich <slyich@gmail.com>
> Signed-off-by: Richard Weinberger <richard@nod.at>
Acked-by: Pekka Enberg <penberg@kernel.org>
prev parent reply other threads:[~2011-04-13 12:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-13 12:41 [PATCH 1/2] um: Fix call tracer and bug handler Richard Weinberger
2011-04-13 12:41 ` [PATCH 2/2] um: Disable CONFIG_CMPXCHG_LOCAL Richard Weinberger
2011-04-13 12:56 ` Pekka Enberg [this message]
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