Hello,
When CONFIG_DRM_RADEON is defined, I get these errors when I compile with the above patch
ERROR: "ttm_bo_vm_open" [drivers/gpu/drm/radeon/radeon.ko] undefined!
ERROR: "ttm_bo_vm_fault" [drivers/gpu/drm/radeon/radeon.ko] undefined!
ERROR: "ttm_bo_vm_close" [drivers/gpu/drm/radeon/radeon.ko] undefined!
Tim