linux-kernel - Re: [thiscpuops upgrade 09/10] x86: this_cpu_cmpxchg and this_cpu_cmpxchg

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Message-ID: <AANLkTikVhqdxD67C-g39pANSddSUi8uWygHd_iTM3iu-@mail.gmail.com>
Date:	Wed, 24 Nov 2010 09:05:02 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, akpm@...ux-foundation.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [thiscpuops upgrade 09/10] x86: this_cpu_cmpxchg and
 this_cpu_cmpxchg_double operations

On Wed, 24 Nov 2010, Eric Dumazet wrote:
>> You have to check cx16 feature flag or implement a fallback ?

On Wed, Nov 24, 2010 at 5:11 AM, Christoph Lameter <cl@...ux.com> wrote:
> There is already a compile time fallback. Uhh.. How do I do this at
> runtime?

I think the CPU alternatives API is meant for just that. Grep for
"alternative" in arch/x86.
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