linux-kernel - Re: [cpuops cmpxchg double V2 1/4] Generic support for this_cpu_cmpxchg

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Message-ID: <alpine.DEB.2.00.1101211244450.15692@router.home>
Date:	Fri, 21 Jan 2011 12:46:32 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Tejun Heo <tj@...nel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [cpuops cmpxchg double V2 1/4] Generic support for
 this_cpu_cmpxchg_double

On Fri, 21 Jan 2011, H. Peter Anvin wrote:

> What is the problem with passing 128-bit structures by value?  I'm quite sure *that* is okay.

You mentioned that earlier and I tried to pass 128 bit structures. My
compiler did not do any of that (gcc 4.4.5). Could come up with
some example code to make yourself certain?


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