From: Jens Freimann <jfrei@linux.vnet.ibm.com>
Date: Tue, 26 Jun 2012 00:59:58 +0000 (+0000)
Subject: vhost: use USER_DS in vhost_worker thread
X-Git-Tag: v3.5-rc5~17^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d7ffde35e31a81100d2d0d2c4013cbf527bb32ea;p=pandora-kernel.git

vhost: use USER_DS in vhost_worker thread

On some architectures address spaces are set up in a way that this is
not necessary to work properly but on some others (like s390) it is.
Make sure we operate on the user address space to allow copy_xxx_user()
from the vhost_worker() thread by setting it explicitly before calling
use_mm() and revert it after unuse_mm().

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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