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

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Message-ID: <alpine.DEB.2.00.1011232110540.7446@router.home>
Date:	Tue, 23 Nov 2010 21:11:26 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	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:

> I thought some x86_64 cpus dont have cmpxchg16b ?

Right I vaguely remember a flag there.

> You have to check cx16 feature flag or implement a fallback ?

There is already a compile time fallback. Uhh.. How do I do this at
runtime?

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