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

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Date:	Fri, 21 Jan 2011 18:19:14 +0100
From:	Tejun Heo <tj@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux.com>, 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, Jan 21, 2011 at 09:13:41AM -0800, H. Peter Anvin wrote:
> We could do cmpxchg with a structure... the problem with a lon int
> type is that Cristoph ran into bugs with __int128 on 64 bits.

But, IIRC, the problem with int128 was with passing it as parameter
and return value.  We don't have to do that.  We'll be just using it
as a data storage / container type.  Or even that is broken?

Thanks.

-- 
tejun
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