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The drm_gem_mmap() function first finds the GEM object to be mapped based on the fake mmap offset and then maps the object. Split the object mapping code into a standalone drm_gem_mmap_obj() function that can be used to implement dma-buf mmap() operations. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by: Rob Clark <robdclark@gmail.com>