linux-kernel - Re: i386 PDA patches use of %gs

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Message-Id: <1158047806.2992.7.camel@laptopd505.fenrus.org>
Date:	Tue, 12 Sep 2006 09:56:46 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	akpm@...l.org, ak@...e.de, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: i386 PDA patches use of %gs

On Tue, 2006-09-12 at 00:48 -0700, Jeremy Fitzhardinge wrote:
> Arjan van de Ven wrote:
> > Jeremy, is there a reason you're specifically using %gs and not %fs? If
> > not, would you mind a switch to using %fs instead?
> >   
> 
> The main reason for using %gs was to take advantage of gcc's TLS 
> support.  I intend to measure the cost of gs vs fs, and if there's a 
> significant difference I'll switch.

gcc can be fixed if needed. I don't see the kernel switching to use that
any time soon though...


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