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

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Date:	Fri, 21 Jan 2011 10:26:49 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Christoph Lameter <cl@...ux.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"H. Peter Anvin" <hpa@...or.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

Hello,

On Fri, Jan 21, 2011 at 09:31:02AM +0200, Pekka Enberg wrote:
> On 1/8/11 7:24 PM, Tejun Heo wrote:
> >Call me weird but I like this one than others.  It sure is ugly but
> >the operation itself isn't a particularly pretty so it kinda matches.
> >Also, this one is the least error prone and more consistent with other
> >cpu ops.
> 
> So what are we going to do about this patch? I'd love to merge
> Christoph's SLUB patches for linux-next now that .38-rc1 is out.

At least you like it, which is good.

I don't think the currently proposed one with two separate parameters
is significantly better than other alternatives and vice-versa.  They
all have slightly different ugliness and error proneness issues.

That said, I still like the double parameter one best, and, unless
there are distinctively good reasons to choose another one, I'm gonna
commit it to percpu tree in a few days so that merge can proceed.  So,
if you have something to say, now would be a good time to assert it.

Thank you.

-- 
tejun
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