[PATCH 4/4] drm/vgem: use shmem helpers

[Sam Ravnborg]

Hi Daniel,

On Thu, Aug 12, 2021 at 03:14:12PM +0200, Daniel Vetter wrote:
> Aside from deleting lots of code the real motivation here is to switch
> the mmap over to VM_PFNMAP, to be more consistent with what real gpu
> drivers do. They're all VM_PFNMP, which means get_user_pages doesn't
> work, and even if you try and there's a struct page behind that,
> touching it and mucking around with its refcount can upset drivers
> real bad.
The only thing I understood of all this complicated stuff was "deleting
lots of code" which is a good thing.
You may want to s/VM_PFNMP/VM_PFNMAP/ before you push this.

	Sam