> - 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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