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

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Message-ID: <4875212E.6090404@goop.org>
Date:	Wed, 09 Jul 2008 13:35:58 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Mike Travis <travis@....com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"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

Eric W. Biederman wrote:
> How does gcc know to use %gs instead of the usual %fs for accessing
> the stack protector variable?  My older gcc-4.1.x on ubuntu always uses %fs.
>   

-mcmodel=kernel

> Or we could do something completely evil.  And use the other segment
> register for the stack canary.
>   

That would still require gcc changes, so it doesn't help much.

    J
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