[adding Jens]
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -1547,6 +1547,8 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
> if (ns->head->disk) {
> nvme_update_disk_info(ns->head->disk, ns, id);
> blk_queue_stack_limits(ns->head->disk->queue, ns->queue);
> + /* XXX: multipath device does not support polling for now... */
> + blk_queue_flag_clear(QUEUE_FLAG_POLL, ns->queue);
I'd drop the XXX. But I think we actually have a block layer problem
here. Currently stacking devices will just pass through REQ_HIPRI,
despite none of them supporting any polling for it.
So we need to make sure in the block layer or I/O submitter that
REQ_HIPRI is only set if QUEUE_FLAG_POLL is supported. I think it would
also help if we rename it to REQ_POLL to make this more obvious.
