From c4cc383915549cf14f027f374904e30c13653dac Mon Sep 17 00:00:00 2001
From: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Date: Mon, 21 Feb 2011 05:42:00 +0100
Subject: [PATCH] drm/vblank: Use abs64(diff_ns) for s64 diff_ns instead of
 abs(diff_ns)

Use of abs() wrongly wrapped diff_ns to 32 bit, which gives a 1/4000
probability of a missed vblank increment at each vblank irq reenable
if the kms driver doesn't support high precision vblank timestamping.
Not a big deal in practice, but let's make it nice.

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