> +size_t dma_direct_max_mapping_size(struct device *dev)
> +{
> +     /*
> +      * Return the minimum of the direct DMA limit and the SWIOTLB limit.
> +      * Since direct DMA has no limit, it is fine to just return the SWIOTLB
> +      * limit.
> +      */
> +     return swiotlb_max_mapping_size(dev);

Well, if we don't actually use the swiotlb buffers despite it being
compiled in or even allocated we don't need the limit.
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