[RFC PATCH v6 5/5] mmc: queue: Use bigger segments if IOMMU can merge the segments

[Wolfram Sang]

> -	blk_queue_max_segments(mq->queue, host->max_segs);
> +	/* blk_queue_can_use_iommu_merging() should succeed if can_merge = 1 */
> +	if (host->can_merge &&
> +	    !blk_queue_can_use_iommu_merging(mq->queue, mmc_dev(host)))
> +		WARN_ON(1);
> +	blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));

Maybe we could use WARN here to save the comment and move the info to
the printout?

-	blk_queue_max_segments(mq->queue, host->max_segs);
+	if (host->can_merge)
+		WARN(!blk_queue_can_use_iommu_merging(mq->queue, mmc_dev(host)),
+		     "merging was advertised but not possible\n");
+	blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));

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