[PATCH] drm/radeon: Don't try to enable write-combining without PAT

[Michel Dänzer]

On 04.02.2015 18:49, Christian König wrote:
> Am 04.02.2015 um 02:19 schrieb Michel Dänzer:
>> From: Michel Dänzer <michel.daenzer at amd.com>
>>
>> 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 at vger.kernel.org
>> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
> 
> Interesting I wonder what the rational behind this is. I mean
> CONFIG_X86_PAT will obviously affect write combining, but why does it
> slow down things if we request something that the kernel isn't
> configured for?

Yeah, I'm not sure exactly what happens in that case, but I don't care
too much, since PAT is clearly desirable anyway.


> Anyway, patch is Reviewed-by: Christian König <christian.koenig at amd.com>

Thanks!


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer