linux-kernel - Re: [PATCH] Remove default_ldt, and simplify ldt-setting.

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Date:	Fri, 25 Aug 2006 01:15:36 +0200
From:	Andi Kleen <ak@...e.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>
Subject: Re: [PATCH] Remove default_ldt, and simplify ldt-setting.

On Friday 25 August 2006 01:04, Jeremy Fitzhardinge wrote:
> (This is the replacement for kill-default_ldt.patch.)
> 
> Remove default_ldt, and simplify ldt-setting.
> 
> This patch removes the default_ldt[] array, as it has been unused
> since iBCS stopped being supported.  This means it is now possible to
> actually set an empty LDT segment.
> 
> In order to deal with this, the set_ldt_desc/load_LDT pair has been
> replaced with a single set_ldt() operation which is responsible for
> both setting up the LDT descriptor in the GDT, and reloading the LDT
> register. 

Looks good.

> If there are no LDT entries, the LDT register is loaded
> with a NULL descriptor.

x86-64 currently doesn't do this -- do you see an particular advantage 
in it?

-Andi
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