null_blk: warning on ignored submit_queues param
Let the user know when the number of submission queues are being
ignored.
Signed-off-by: Matias Bjorling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index f0aeb2a..8f2e7c3 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -590,9 +590,12 @@
}
#endif
- if (queue_mode == NULL_Q_MQ && use_per_node_hctx)
+ if (queue_mode == NULL_Q_MQ && use_per_node_hctx) {
+ if (submit_queues > 0)
+ pr_warn("null_blk: submit_queues param is set to %u.",
+ nr_online_nodes);
submit_queues = nr_online_nodes;
- else if (submit_queues > nr_cpu_ids)
+ } else if (submit_queues > nr_cpu_ids)
submit_queues = nr_cpu_ids;
else if (!submit_queues)
submit_queues = 1;