Re: [PATCH] virtio: Force DMA restricted devices through DMA API

[Christoph Hellwig]

On Tue, Jul 19, 2022 at 10:02:56AM +0000, Keir Fraser wrote:
> +#include <linux/swiotlb.h>

Drivers must never use this header.  We have a few pre-existing abuses
in the drm code, but they will go away.