From: Thomas Hellstrom <thellstrom@vmware.com>
Date: Tue, 6 Nov 2012 11:31:50 +0000 (+0000)
Subject: drm/ttm, drm/vmwgfx: Use RCU locking for object lookups v3
X-Git-Tag: v3.8-rc1~82^2~148
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cdad05216c2b2edfe92a9f87d6ae51aab277f3b2;p=pandora-kernel.git

drm/ttm, drm/vmwgfx: Use RCU locking for object lookups v3

The mostly used lookup+get put+potential_destroy path of TTM objects
is converted to use RCU locks. This will substantially decrease the amount
of locked bus cycles during normal operation.
Since we use kfree_rcu to free the objects, no rcu synchronization is needed
at module unload time.

v2: Don't touch include/linux/kref.h
v3: Adapt to kref_get_unless_zero return value change

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

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