From bc21512835a72bc1eab7abd7d8a1bff0435591d7 Mon Sep 17 00:00:00 2001
From: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Date: Mon, 21 Feb 2011 05:42:01 +0100
Subject: [PATCH] drm/vblank: Use memory barriers optimized for atomic_t
 instead of generics.

Documentation/atomic_ops.txt tells us that there are memory
barriers optimized for atomic_inc and other atomic_t ops.

Use these instead of smp_wmb(), and also to make the required
memory barriers around vblank counter increments more explicit.

Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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