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

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Message-ID: <4D3D15AF.30508@zytor.com>
Date:	Sun, 23 Jan 2011 22:01:19 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Tejun Heo <tj@...nel.org>
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 01/21/2011 09:19 AM, Tejun Heo wrote:
> 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?

Well, part of the point was to pass in registers.

No idea on the data storage type.

	-hpa
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