linux-kernel - Re: [RFC 00/15] x86_64: Optimize percpu accesses

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Date:	Wed, 09 Jul 2008 14:12:22 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Mike Travis <travis@....com>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

Jeremy Fitzhardinge wrote:

> No, they don't help at all, because they convert X_pda(Y) (which doesn't
> exist) into x86_X_percpu(pda.Y) (which also doesn't exist).  They don't
> remove any #ifdef CONFIG_X86_64's.  If you're going to tromp all over
> the source, you may as well do the most useful thing in the first step.

Well they help in the sense that the patches get rid of the special X_pda(Y) operations. 
x86_X_percpu will then exist under 32 bit and 64 bit.

What is remaining is the task to rename 

	pda.Y -> Z

in order to make variable references the same under both arches. Presumably the Z is the corresponding 32 bit variable. There are likely a number of cases where the transformation
is trivial if we just identify the corresponding 32 bit equivalent.

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