linux-kernel - Re: [PATCH] block: print symbolic error name instead of error code

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Message-ID: <ecf3adb2-596b-471b-8e35-b8f8124167f2@kernel.org>
Date: Fri, 12 Jan 2024 08:37:23 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Christian Heusel <christian@...sel.eu>, Jens Axboe <axboe@...nel.dk>,
 Dave Chinner <dchinner@...hat.com>, Jan Kara <jack@...e.cz>,
 Thomas Weißschuh <linux@...ssschuh.net>,
 Christian Brauner <brauner@...nel.org>, Min Li <min15.li@...sung.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] block: print symbolic error name instead of error code

On 1/12/24 08:15, Christian Heusel wrote:
> Utilize the %pe print specifier to get the symbolic error name as a
> string (i.e "-ENOMEM") in the log message instead of the error code to
> increase its readablility.
> 
> This change was suggested in
> https://lore.kernel.org/all/92972476-0b1f-4d0a-9951-af3fc8bc6e65@suswa.mountain/
> 
> Signed-off-by: Christian Heusel <christian@...sel.eu>
> ---
>  block/partitions/core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/block/partitions/core.c b/block/partitions/core.c
> index f47ffcfdfcec..932df4db76f1 100644
> --- a/block/partitions/core.c
> +++ b/block/partitions/core.c
> @@ -570,8 +570,8 @@ static bool blk_add_partition(struct gendisk *disk,
>  	part = add_partition(disk, p, from, size, state->parts[p].flags,
>  			     &state->parts[p].info);
>  	if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) {
> -		printk(KERN_ERR " %s: p%d could not be added: %ld\n",
> -		       disk->disk_name, p, -PTR_ERR(part));
> +		printk(KERN_ERR " %s: p%d could not be added: %pe\n",
> +		       disk->disk_name, p, part);

pr_err() ?

>  		return true;
>  	}
>  

-- 
Damien Le Moal
Western Digital Research