drm: Add linux/llist.h

Mostly obtained from OpenBSD with a few key modifications

drm/linux: Add vmalloc() and vzalloc()

drm/linux: use pgprot_t

drm: Define struct page and use it everywhere

* Removing countless differences with Linux

* struct page is essentially struct vm_page named differently.
Both can be casted to the other one withou

drm: Define struct page and use it everywhere

* Removing countless differences with Linux

* struct page is essentially struct vm_page named differently.
Both can be casted to the other one without further thought.

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drm/linux: Add vmalloc_user() and vfree()

drm/linux: Improve vmap/vunmap API, add is_vmalloc_addr()

* vmap() and vunmap() only take a single argument

kernel - Tag vm_map_entry structure, slight optimization to zalloc, misc.

* Tag the vm_map_entry structure, allowing debugging programs to
break-down how KMEM is being used more easily.

This re

kernel - Tag vm_map_entry structure, slight optimization to zalloc, misc.

* Tag the vm_map_entry structure, allowing debugging programs to
break-down how KMEM is being used more easily.

This requires an additional argument to vm_map_find() and most
kmem_alloc*() functions.

* Remove the page chunking parameter to zinit() and zinitna(). It was
only being used degeneratively. Increase the chunking from one page
to four pages, which will reduce the amount of vm_map_entry spam in
the kernel_map.

* Use atomic ops when adjusting zone_kern_pages.

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drm - Fix memory leak in broadwell or later GPUs

* vunmap() linux compatibility code was not implemented, leading to a
memory leak for certain operations in newer GPUs. Browsers tend to
tickle

drm - Fix memory leak in broadwell or later GPUs

* vunmap() linux compatibility code was not implemented, leading to a
memory leak for certain operations in newer GPUs. Browsers tend to
tickle the code paths in question.

* Implement vunmap() to fix the leak.

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drm/linux: Add vmap()

drm: Add linux/vmalloc.h