From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: linux-ia64@vger.kernel.org
Subject: RE: Why does ia64 not use fetchadd in atomic.h?
Date: Thu, 15 Jun 2006 21:39:16 +0000 [thread overview]
Message-ID: <000201c690c4$286d2870$e434030a@amr.corp.intel.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0606151323380.10549@schroedinger.engr.sgi.com>
Christoph Lameter wrote on Thursday, June 15, 2006 2:29 PM
> > On Thu, Jun 15, 2006 at 01:35:42PM -0700, Christoph Lameter wrote:
> > > Why not
> > >
> > > #define ia64_atomic_add(__i, __v) ia64_fetchadd(__i, &v->counter, acq)
> >
> > Because ia64_fetchadd() only supports 8 different constants?
>
> Right. I forgot about that. Only a call to atomic_add does the fetchadd
> trickery. Thanks.
I guess I got confused, are you complaining about ia64_atomic_add or
ia64_atomic64_add? If the former, there is not much can be done, but if
the latter, yeah, it can be optimized for certain constant.
next prev parent reply other threads:[~2006-06-15 21:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-15 20:35 Why does ia64 not use fetchadd in atomic.h? Christoph Lameter
2006-06-15 20:49 ` Matthew Wilcox
2006-06-15 20:50 ` Chen, Kenneth W
2006-06-15 21:28 ` Christoph Lameter
2006-06-15 21:39 ` Chen, Kenneth W [this message]
2006-06-15 21:48 ` Christoph Lameter
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