linux-kernel - Re: [PATCH RFC 0/6] Implement per-processor data areas for i386.

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Date:	Wed, 30 Aug 2006 19:32:38 +0200
From:	Andi Kleen <ak@...e.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Chuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH RFC 0/6] Implement per-processor data areas for  i386.

On Wednesday 30 August 2006 19:13, Jeremy Fitzhardinge wrote:
> Andi Kleen wrote:
> > I tried that once on x86-64, but it wasn't possible because the linker
> > is missing the right relocations. It has something on the first look similar 
> > for __thread data in user space, but it wasn't usable for the kernel.
> >   
> The other difficulty is that you can't take the addresses of things in 
> the pda and pass them around, which happens a lot.  

The user space __thread works around this by always storing the address at
offset 0. Kernel does it similar, except it's not at offset 0.


> (Hm, it would be interesting to see if we could possibly use the code 
> generated by gcc for TLS variables...)

I tried once on 64bit and it wasn't possible for various reasons.

-Andi
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