From: Matias Bjorling <m@bjorling.me>
Date: Wed, 18 Dec 2013 12:41:44 +0000 (+0100)
Subject: null_blk: warning on ignored submit_queues param
X-Git-Tag: accepted/tizen/common/20141203.182822~868^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d15ee6b1a43afbe1a6cece3bd8d336a9d5cb7060;p=platform%2Fkernel%2Flinux-arm64.git

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 @@ static int __init null_init(void)
 	}
 #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;