drm: add DRM_INFO_ONCE() to print a one-time DRM_INFO() message
Just like DRM_INFO(), but only do it once. Signed-off-by: NJani Nikula <jani.nikula@intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Acked-by: NDave Airlie <airlied@gmail.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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