From: Eric W. Biederman <ebiederm@xmission.com>
Date: Tue, 26 Sep 2006 08:52:38 +0000 (+0200)
Subject: [PATCH] Reload CS when startup_64 is used.
X-Git-Tag: v2.6.19-rc1~1077^2~61
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=26374c7b7dca1ff90607c83d9b82e917119f0456;p=pandora-kernel.git

[PATCH] Reload CS when startup_64 is used.

In long mode the %cs is largely a relic.  However there are a few cases
like iret where it matters that we have a valid value.  Without this
patch it is possible to enter the kernel in startup_64 without setting
%cs to a valid value.  With this patch we don't care what %cs value
we enter the kernel with, so long as the cs shadow register indicates
it is a privileged code segment.

Thanks to Magnus Damm for finding this problem and posting the
first workable patch.  I have moved the jump to set %cs down a
few instructions so we don't need to take an extra jump.  Which
keeps the code simpler.

Signed-of-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andi Kleen <ak@suse.de>
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