[PATCH v8] drm: Add library for shmem backed GEM objects

[Eric Anholt]

Rob Herring <robh at kernel.org> writes:

> From: Noralf Trønnes <noralf at tronnes.org>
>
> This adds a library for shmem backed GEM objects.

I read through the whole thing, and the only bit I didn't like
(drm_gem_shmem_create_with_handle returns an unrefcounted object
pointer) was a copy-and-paste from CMA that we should fix in both
places, and has no downside in the current usage since the pointer value
is unused.  Just one question left:

> v7:
> - Use write-combine for mmap instead. This is the more common
>   case. (robher)

I don't actually see this in the code.  Wasn't there supposed to be a:

       vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
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