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

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Message-ID: <48751B57.8030605@goop.org>
Date:	Wed, 09 Jul 2008 13:11:03 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Mike Travis <travis@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

Ingo Molnar wrote:
> Note that the zero-based percpu problems are completely unrelated to 
> stackprotector. I was able to hit them with a stackprotector-disabled 
> gcc-4.2.3 environment.

The only reason we need to keep a zero-based pda is to support 
stack-protector.  If we drop drop it, we can drop the pda - and its 
special zero-based properties - entirely.

    J
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