> > Considering the call trace you sent:
> >
> > > - elevator_exit(block->request_queue->elevator);
> > > - rc = elevator_init(block->request_queue, "deadline");
> >
> > block->request_queue->elevator = NULL is missing here.
> >
> > > - if (rc) {
> > > - blk_cleanup_queue(block->request_queue);
> > > - return rc;
> > > - }
> >
> > Fallback to noop and printing a warning wouldn't be bad.
>
> Is noop better than the default (e.g., CFQ)?
>
> I was thinking that if the deadline init fails, we put back the old elevator
> - whatever it may be.
>
> > In addition something like depends on IOSCHED_DEADLINE should be added to
> > the Kconfig file.
>
> Alright, so...
>
> 1) Kconfig change, ->elevator = NULL
That should be the way to go, since we want the deadline scheduler.
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