linux-kernel - [PATCH 21/21] null_blk: Do not limit # of hardware queues to # of CPUs

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Message-Id: <396c32323faf66b39dd5f162452056b5dfd5db75.1474014910.git.agordeev@redhat.com>
Date:   Fri, 16 Sep 2016 10:51:32 +0200
From:   Alexander Gordeev <agordeev@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Alexander Gordeev <agordeev@...hat.com>,
        Jens Axboe <axboe@...nel.dk>, linux-nvme@...ts.infradead.org
Subject: [PATCH 21/21] null_blk: Do not limit # of hardware queues to # of CPUs

It is not responsibility of device driver to assume number of
hardware queues used. Let the block layer decide instead.

CC: Jens Axboe <axboe@...nel.dk>
CC: linux-nvme@...ts.infradead.org
Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 drivers/block/null_blk.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index 1747040..8c5cf88 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -793,9 +793,7 @@ static int __init null_init(void)
 							nr_online_nodes);
 			submit_queues = nr_online_nodes;
 		}
-	} else if (submit_queues > nr_cpu_ids)
-		submit_queues = nr_cpu_ids;
-	else if (!submit_queues)
+	} else if (!submit_queues)
 		submit_queues = 1;
 
 	mutex_init(&lock);
-- 
1.8.3.1