linux-kernel - Re: [PATCH 3/4] x86_64: Fold pda into per cpu area

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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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