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Subject: Re: i386 PDA patches use of %gs
From: Arjan van de Ven <arjan@infradead.org>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: akpm@osdl.org, ak@suse.de, mingo@elte.hu, linux-kernel@vger.kernel.org
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Organization: Intel International BV
Date: Tue, 12 Sep 2006 09:56:46 +0200
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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...