drm/linux: pfn_to_page() returns a struct page*

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: Sync include directives with Linux

* Add a few key include/asm or include/linux headers

* Move some code from .h to .c files in order to avoid clashes
between the DragonFly and Linux variant

drm: Sync include directives with Linux

* Add a few key include/asm or include/linux headers

* Move some code from .h to .c files in order to avoid clashes
between the DragonFly and Linux variants of kmalloc() and kfree()

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drm/linux: Add asm/memory_model.h