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

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Date:   Tue, 22 Nov 2022 22:55:46 +0800 (GMT+08:00)
From:   "Jinlong Chen" <nickyc975@....edu.cn>
To:     axboe@...nel.dk
Cc:     hch@....de, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [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;
>  }
>  

Hi, Jens!

This patch is suggested by Christoph, but I forgot to add the Suggested-by
tag. Would you please add "Suggested-by: Christoph Hellwig <hch@....de>"
if you apply the patch?

Thanks!
Jinlong Chen