[PATCH 17/25] drm: rip out drm_core_has_MTRR checks

[Daniel Vetter]

On Fri, Aug 9, 2013 at 8:12 PM, Andy Lutomirski <luto at amacapital.net> wrote:
> On Thu, Aug 8, 2013 at 6:41 AM, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
>> The new arch_phys_wc_add/del functions do the right thing both with
>> and without MTRR support in the kernel. So we can drop these
>> additional checks.
>
> If any of the new arch_phys_wc_add calls are reachable and if the
> driver calls arch_phys_wc_add itself, then the lack of refcounting on
> non-PAT systems may cause a problem.  (I don't understand the drm
> stuff well enough to know whether that can actually happen.)

This is only about compile-time options really. Somehow drm had the
idea to use these check functions instead of #ifdef plus dummy static
inline noop functions. David Herrmann just did the same patch for the
agp stuff. So refcounting is of no concern here.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch