[dm-devel] [PATCH V5 03/12] block: create io poll context for submission and poll task

[Christoph Hellwig]

>  /**
>   * blk_poll - poll for IO completions

> @@ -3875,6 +3886,9 @@ int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin)
>  	if (current->plug)
>  		blk_flush_plug_list(current->plug, false);
>  
> +	if (!queue_is_mq(q))
> +		return blk_bio_poll(q, cookie, spin);
> +
>  	hctx = q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)];

Before doing this, blk_poll needs to be split into the public blk_poll
that should go into blk_poll, and a blk_mq_poll that should remain in
blk-mq.c.