From a53fa43873b88bad15a2eb1f01dc5efa689625ce Mon Sep 17 00:00:00 2001
From: =?utf8?q?Michel=20D=C3=A4nzer?= <michel.daenzer@amd.com>
Date: Wed, 4 Feb 2015 10:19:51 +0900
Subject: [PATCH] drm/radeon: Don't try to enable write-combining without PAT
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Doing so can cause things to become slow.

Print a warning at compile time and an informative message at runtime in
that case.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88758
Cc: stable@vger.kernel.org
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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