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Message-ID: <Pine.LNX.4.64.0806091617390.9534@schroedinger.engr.sgi.com>
Date: Mon, 9 Jun 2008 16:18:34 -0700 (PDT)
From: Christoph Lameter <clameter@....com>
To: Jeremy Fitzhardinge <jeremy@...p.org>
cc: Mike Travis <travis@....com>, Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
David Miller <davem@...emloft.net>,
Eric Dumazet <dada1@...mosbay.com>,
linux-kernel@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 3/4] x86_64: Fold pda into per cpu area
On Wed, 4 Jun 2008, Jeremy Fitzhardinge wrote:
> > %gs:[&per_cpu_xxxx - __per_cpu_start]
> >
>
> Unfortunately that doesn't actually work, because you can't have a reloc with
> two variables.
That is just a conceptual discussion. __per_cpu_start is 0 with the zero
based patch. And thus this reduces to
%gs[&per_cpu_xxx]
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