From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Wed, 25 Jun 2008 04:19:25 +0000 (-0400)
Subject: x86: use __KERNEL_DS as SS when returning to a kernel thread
X-Git-Tag: v2.6.27-rc1~1106^2~127
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e04e0a630d8b5c621b3a8e70ff20db737d3a5728;p=pandora-kernel.git

x86: use __KERNEL_DS as SS when returning to a kernel thread

This is needed when the kernel is running on RING3, such as under Xen.
x86_64 has a weird feature that makes it #GP on iret when SS is a null
descriptor.

This need to be tested on bare metal to make sure it doesn't cause any
problems. AMD specs say SS is always ignored (except on iret?).

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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