drm/amdgpu: use HMM mirror callback to replace mmu notifier v5

Yang, Philip amd-gfx 1 version Dec 3, 2018 In review

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#	Subject and files	Size	Replies	Applied
1/2	drm/amdgpu: use HMM mirror callback to replace mmu notifier v5`drivers/gpu/drm/amd/amdgpu/Kconfig` `drivers/gpu/drm/amd/amdgpu/Makefile` `drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c` +1 more	+57 ~~-77~~	2 replies
2/2	drm/amdgpu: replace get_user_pages with HMM address mirror helpers v2`drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c` `drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c` `drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h` +8 more	+312 ~~-272~~	2 replies

No Reviewed-by, Acked-by or Tested-by trailers for v1 yet.