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Date: Tue, 14 Dec 2004 08:45:54 +0100
From: Andi Kleen <ak@suse.de>
To: Petr Vandrovec <vandrove@vc.cvut.cz>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, Andi Kleen <ak@suse.de>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: 32-bit syscalls from 64-bit process on x86-64?
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> #define TOLM                            \
>                 "pushl %%cs\n"          \
>                 "pushl $91f\n"          \
>                 "ljmpl $0x33,$90f\n"    \

It's useless, there is nothing in the kernel code that checks the 
32bit segment.

-Andi