drm: Make the prime vmap/vunmap hooks optional.
Some drivers leave these unimplemented, so don't make them have unimplemented stubs. Signed-off-by:Eric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/20180424004610.4637-2-eric@anholt.net Reviewed-by:
Daniel Vetter <daniel.vetter@ffwll.ch>
parent
9f99963a
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