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We'll need to extend the vc4_async_flip_state structure to rely on another callback implementation, so let's move the current one into a union. Reviewed-by: Melissa Wen <mwen@igalia.com> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://lore.kernel.org/r/20220610115149.964394-10-maxime@cerno.tech