From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Dave Airlie <airlied@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
David Miller <davem@davemloft.net>,
airlied@linux.ie, linux-kernel@vger.kernel.org
Subject: Re: cmpxchg is not available to generic code
Date: Mon, 23 Jul 2007 16:48:28 +1000 [thread overview]
Message-ID: <46A44F3C.5080301@yahoo.com.au> (raw)
In-Reply-To: <21d7e9970707190123n328300a6m8debe274b959ab30@mail.gmail.com>
Dave Airlie wrote:
> On 7/19/07, Andrew Morton <akpm@linux-foundation.org> wrote:
>
>> On Thu, 19 Jul 2007 18:15:03 +1000 "Dave Airlie" <airlied@gmail.com>
>> wrote:
>>
>> > Maybe we could add CONFIG_HAVE_CMPXCHG and let DRM depend on it..
>>
>> That would certainly be better than adding a sprinkle of architectures
>> in DRM Kconfig dependencies.
>>
>> I don't know how important DRM is on ARM. Zero?
>>
>
> I'd guess zero I suppose if you wanted you could hook up a PCI
> graphics card on ARM, but if you do that I think you could implement
> cmpxchg :-)
ARM does the locked load / store conditional thing which is at least as
strong as cmpxchg, so I imagine it could implement this API in kernel
and userspace quite easily if needed.
--
SUSE Labs, Novell Inc.
next prev parent reply other threads:[~2007-07-23 6:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-19 7:05 cmpxchg is not available to generic code Andrew Morton
2007-07-19 7:27 ` David Miller
2007-07-19 8:15 ` Dave Airlie
2007-07-19 8:21 ` Andrew Morton
2007-07-19 8:23 ` Dave Airlie
2007-07-23 6:48 ` Nick Piggin [this message]
2007-07-19 20:54 ` David Miller
2007-07-19 20:58 ` David Miller
2007-07-19 8:02 ` Dave Airlie
2007-07-19 8:10 ` Andrew Morton
2007-07-19 8:19 ` Dave Airlie
2007-07-19 8:36 ` Andrew Morton
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