I think that "blk-mq: honor IO scheduler for multiqueue devices" is
broken in disco because it misses the following commit:
commit 970d168de636ddac8221cbd4a11d7678943e7379
blk-mq: simplify blk_mq_make_request()
Move the blk_mq_bio_to_request() call in front of the if-statement.
Either this has to be picked before the mq change or there must be a
call to blk_mq_bio_to_request(rq, bio) before calling
blk_mq_sched_insert_request(rq, false, true, true):
}
blk_add_rq_to_plug(plug, rq);
+ } else if (q->elevator) {
+ blk_mq_bio_to_request(rq, bio);
+ blk_mq_sched_insert_request(rq, false, true, true);
} else if (plug && !blk_queue_nomerges(q)) {
blk_mq_bio_to_request(rq, bio);
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https://bugs.launchpad.net/bugs/1853981
Title:
[Regression] Failed to boot disco kernel built from master-next
(kernel kernel NULL pointer dereference)
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