Re: [PATCH 03/15] block: move sched debugfs register into elvevator_register_queue

[Christoph Hellwig <hch@xxxxxx>]

>  	lockdep_assert_held(&q->elevator_lock);
>  
> +	if (test_bit(ELEVATOR_FLAG_REGISTERED, &e->flags))
> +		return 0;
> +

This looks unrelate to the rest of the patch, and I also don't understand
why it's needed as the callers of elv_register_queue don't change.

The rest of the patch looks good to me.