Re: [PATCH 1/5] misc: vop: change the way of allocating vring for noncoherent platform

[Christoph Hellwig]

> +#include <linux/dma-noncoherent.h>

This header must not be included in drivers.

>  
> +		if (dev_is_dma_coherent(vop_dev(vdev)))

And this API must not be used in drivers either.

> +			vdev->vvr[i].vrh.vring.used =
> +				(void __force *)vpdev->hw_ops->remap(

And you must not use __force casts without a comment explanation why
they are safe.