From 82fe50bcc87e508e85250c87b745296a36a07897 Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thellstrom@vmware.com>
Date: Wed, 21 Nov 2012 14:53:21 +0000
Subject: [PATCH] drm/ttm: Optimize vm locking using kref_get_unless_zero v3

Removes the need for a write lock each time we call ttm_bo_unref().

v2: Remove an unused variable.
v3: Really remove the unused variable.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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