linux-kernel - Re: [PATCH] scsi: core: fix -Wformat

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Date:   Sat, 7 Nov 2020 17:59:10 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] scsi: core: fix -Wformat

On Sat, Nov 07, 2020 at 12:11:32AM -0800, Nick Desaulniers wrote:
> Clang is more aggressive about -Wformat warnings when the format flag
> specifies a type smaller than the parameter. Turns out, struct
> Scsi_Host's member can_queue is actually an int. Fixes:
> 
> warning: format specifies type 'short' but the argument has type 'int'
> [-Wformat]
> shost_rd_attr(can_queue, "%hd\n");
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>                           %d
> Link: https://github.com/ClangBuiltLinux/linux/issues/378
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  drivers/scsi/scsi_sysfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
> index d6e344fa33ad..b6378c8ca783 100644
> --- a/drivers/scsi/scsi_sysfs.c
> +++ b/drivers/scsi/scsi_sysfs.c
> @@ -370,7 +370,7 @@ static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store
>  
>  shost_rd_attr(unique_id, "%u\n");
>  shost_rd_attr(cmd_per_lun, "%hd\n");
> -shost_rd_attr(can_queue, "%hd\n");
> +shost_rd_attr(can_queue, "%d\n");
>  shost_rd_attr(sg_tablesize, "%hu\n");
>  shost_rd_attr(sg_prot_tablesize, "%hu\n");
>  shost_rd_attr(unchecked_isa_dma, "%d\n");
> -- 
> 2.29.2.222.g5d2a92d10f8-goog
>