Re: [PATCH v2 03/11] swiotlb-xen: add struct device* parameter to xen_phys_to_bus

[Christoph Hellwig]

On Wed, Jun 03, 2020 at 03:22:39PM -0700, Stefano Stabellini wrote:
> From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
> 
> The parameter is unused in this patch.
> No functional changes.

This looks weird.  I'm pretty sure you are going to use it later, but
why not just add the argument when it actually is used?