drm/shmem: switch shmem helper to &drm_gem_object_funcs.mmap
Switch gem shmem helper to the new mmap() workflow, from &gem_driver.fops.mmap to &drm_gem_object_funcs.mmap. v2: Fix vm_flags and vm_page_prot handling. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Steven Price <steven.price@arm.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20191016115203.20095-3-kraxel@redhat.com
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