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SubjectRe: [PATCH 2/3] dma: Introduce dma_max_mapping_size()
> +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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