[PATCH 2/9] block: add scatterlist-less DMA mapping helpers

[Kanchan Joshi]

On 6/10/2025 10:36 AM, Christoph Hellwig wrote:
> +static bool blk_dma_map_bus(struct request *req, struct device *dma_dev,

Both are not used in the function body.

> + */
> +bool blk_rq_dma_map_iter_start(struct request *req, struct device *dma_dev,
> +		struct dma_iova_state *state, struct blk_dma_iter *iter)
> +{
> +	unsigned int total_len = blk_rq_payload_bytes(req);
> +	struct phys_vec vec;
> +
> +	iter->iter.bio = req->bio;
> +	iter->iter.iter = req->bio->bi_iter;
> +	memset(&iter->p2pdma, 0, sizeof(iter->p2pdma));
Should this (or maybe p2pdma field itself) be compiled out using 
CONFIG_PCI_P2PDMA.