From: Tejun Heo <tj@kernel.org>
To: Christoph Lameter <cl@linux.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
akpm@linux-foundation.org, Pekka Enberg <penberg@cs.helsinki.fi>,
linux-kernel@vger.kernel.org,
Eric Dumazet <eric.dumazet@gmail.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: Re: [cpuops cmpxchg double V1 1/4] Generic support for this_cpu_cmpxchg_double
Date: Mon, 27 Dec 2010 11:52:03 +0100 [thread overview]
Message-ID: <20101227105203.GE11419@htj.dyndns.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1012251753530.8506@router.home>
On Sat, Dec 25, 2010 at 05:55:22PM -0600, Christoph Lameter wrote:
> On Sat, 25 Dec 2010, Tejun Heo wrote:
>
> > ABI. But that said, it might still be problematic on other
> > architectures when we try to apply it to different architectures. Is
> > everyone against just taking a scalar for the first variable instead
> > of taking a pointer? I'd be happier with that than the current one.
>
> How about replacing that with two scalars? Macro will check that the
> scalaers are properly aligned and that the second follows the first. Then
> there is also better symmetry in the parameters.
>
> bool this_cpu_cmpxchg_double(
> percpu_1, percpu_2
> old_1, old_2
> new_1, new_2
> )
Yeah, maybe. The interface is a bit redundant but probably the most
fool proof. I'm okay with either taking a single scalar or both.
Thanks.
--
tejun
next prev parent reply other threads:[~2010-12-27 10:52 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-14 17:48 [cpuops cmpxchg double V1 0/4] this_cpu_cmpxchg_double support Christoph Lameter
2010-12-14 17:48 ` [cpuops cmpxchg double V1 1/4] Generic support for this_cpu_cmpxchg_double Christoph Lameter
2010-12-18 14:47 ` Tejun Heo
2010-12-18 14:51 ` Tejun Heo
2010-12-21 22:36 ` Christoph Lameter
2010-12-21 23:24 ` H. Peter Anvin
2010-12-22 9:14 ` Tejun Heo
2010-12-24 0:16 ` Christoph Lameter
2010-12-24 0:22 ` H. Peter Anvin
2010-12-25 4:53 ` Christoph Lameter
2010-12-25 6:11 ` H. Peter Anvin
2010-12-25 16:52 ` Tejun Heo
2010-12-25 23:55 ` Christoph Lameter
2010-12-27 10:52 ` Tejun Heo [this message]
2011-01-03 22:43 ` Christoph Lameter
2010-12-14 17:48 ` [cpuops cmpxchg double V1 2/4] x86: this_cpu_cmpxchg_double() support Christoph Lameter
2010-12-15 0:46 ` H. Peter Anvin
2010-12-15 0:56 ` H. Peter Anvin
2010-12-15 16:12 ` Christoph Lameter
2010-12-15 16:20 ` Christoph Lameter
2010-12-15 17:36 ` H. Peter Anvin
2010-12-15 17:53 ` Christoph Lameter
2010-12-15 16:32 ` H. Peter Anvin
2010-12-15 16:41 ` Christoph Lameter
2010-12-14 17:48 ` [cpuops cmpxchg double V1 3/4] slub: Get rid of slab_free_hook_irq() Christoph Lameter
2010-12-14 17:48 ` [cpuops cmpxchg double V1 4/4] Lockless (and preemptless) fastpaths for slub Christoph Lameter
2010-12-15 16:51 ` Tejun Heo
2010-12-15 16:55 ` Pekka Enberg
2010-12-15 16:57 ` Tejun Heo
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