From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Lameter <cl@linux-foundation.org>
Subject: Re: Add PGM protocol support to the IP stack
Date: Tue, 30 Mar 2010 13:12:04 -0500 (CDT)
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Cc: Andi Kleen <andi@firstfloor.org>,
	David Miller <davem@davemloft.net>, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
To: "H. Peter Anvin" <hpa@zytor.com>
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On Mon, 29 Mar 2010, H. Peter Anvin wrote:

> On 03/22/2010 11:53 AM, Andi Kleen wrote:
> >
> > There's just no portable atomic64_t. Ok maybe you can use the socket lock
> > to synchronize all the counts if they are only per socket.
> >
>
> In 2.6.34 there is (although some arches which could support it natively
> don't as of yet... but that's fixable.)  See lib/atomic64.c.

There are also the 64bit thiscpu operations that were merged in 2.6.33.
They do the right thing if the arch does not provide operations.