linux-kernel - [PATCH 2/4] elevator: printk a warning if switching to a new io scheduler fails

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Date:   Tue, 22 Nov 2022 22:21:24 +0800
From:   Jinlong Chen <nickyc975@....edu.cn>
To:     axboe@...nel.dk
Cc:     hch@....de, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, nickyc975@....edu.cn
Subject: [PATCH 2/4] elevator: printk a warning if switching to a new io scheduler fails

printk a warning to indicate that the io scheduler has been set to none
if switching to a new io scheduler fails.

Signed-off-by: Jinlong Chen <nickyc975@....edu.cn>
---
 block/elevator.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/block/elevator.c b/block/elevator.c
index 01aa9f38f22e..1fa45717b1d6 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -683,6 +683,12 @@ int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
 out_unfreeze:
 	blk_mq_unquiesce_queue(q);
 	blk_mq_unfreeze_queue(q);
+
+	if (ret) {
+		pr_warn("elv: switch to \"%s\" failed, falling back to \"none\"\n",
+			new_e->elevator_name);
+	}
+
 	return ret;
 }
 
-- 
2.34.1