[RFC v2 02/11] iov_iter: introduce iter type for pre-registered dma

[Anuj gupta]

> +void iov_iter_dma_token(struct iov_iter *i, unsigned int direction,
> +                       struct dma_token *token,
> +                       loff_t off, size_t count)
> +{
> +       WARN_ON(direction & ~(READ | WRITE));
> +       *i = (struct iov_iter){
> +               .iter_type = ITER_DMA_TOKEN,
> +               .data_source = direction,
> +               .dma_token = token,
> +               .iov_offset = 0,

nit: iov_offset is getting below too. can get rid of this one.
> +               .count = count,
> +               .iov_offset = off,
> +       };