From: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Date: Mon, 7 Dec 2009 11:44:42 +0000 (+0100)
Subject: [S390] s390: clear high-order bits of registers after sam64
X-Git-Tag: v2.6.33-rc1~349^2~71
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cf87b7439ec81b9374e7772e44e9cb2eb9e57160;p=pandora-kernel.git

[S390] s390: clear high-order bits of registers after sam64

When the kernel is IPLed without the CLEAR option and switches
to 64-bit, the high-order half of the registers might contain
random values.  This can cause addressing exceptions and the
kernel enters an interrupt loop.

Initialize the high-order half of the general purpose registers
with zeros after switching to 64-bit mode.

Cc: <stable@kernel.org>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

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