From b9aef63aca772a25ffcfaedf4bd29fb36b919a93 Mon Sep 17 00:00:00 2001
From: Damien Le Moal <damien.lemoal@wdc.com>
Date: Tue, 4 Jun 2019 16:23:40 +0900
Subject: [PATCH] block: force select mq-deadline for zoned block devices

In most use cases of zoned block devices (aka SMR disks), the
mq-deadline scheduler is mandatory as it implements sequential write
command processing guarantees with zone write locking. So make sure that
this scheduler is always enabled if CONFIG_BLK_DEV_ZONED is selected.

Tested-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 block/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/Kconfig b/block/Kconfig
index 1b220101a9cb6..2466dcc3ef1dc 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -73,6 +73,7 @@ config BLK_DEV_INTEGRITY
 
 config BLK_DEV_ZONED
 	bool "Zoned block device support"
+	select MQ_IOSCHED_DEADLINE
 	---help---
 	Block layer zoned block device support. This option enables
 	support for ZAC/ZBC host-managed and host-aware zoned block devices.
-- 
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