From: Michael S. Tsirkin <mst@redhat.com>
Date: Wed, 28 May 2014 14:07:02 +0000 (+0300)
Subject: vhost: replace rcu with mutex
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~47^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=98f9ca0a3faa99b7388578d55eccecf272be4038;p=pandora-kernel.git

vhost: replace rcu with mutex

All memory accesses are done under some VQ mutex.
So lock/unlock all VQs is a faster equivalent of synchronize_rcu()
for memory access changes.
Some guests cause a lot of these changes, so it's helpful
to make them faster.

Reported-by: "Gonglei (Arei)" <arei.gonglei@huawei.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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