linux-kernel - Re: [PATCH v2][next] scsi: pm80xx: Avoid -Wflex-array-member-not-at-end warnings

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Message-ID: <47624b76-3b19-4805-b48a-040e943c7f2a@oracle.com>
Date: Fri, 5 Sep 2025 08:05:01 +0100
From: John Garry <john.g.garry@...cle.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Jack Wang <jinpu.wang@...ud.ionos.com>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2][next] scsi: pm80xx: Avoid
 -Wflex-array-member-not-at-end warnings

On 04/09/2025 15:54, Gustavo A. R. Silva wrote:
> Remove unused field residual_count in a couple of structures,
> and with this, fix the following -Wflex-array-member-not-at-end
> warnings:
> 
> drivers/scsi/pm8001/pm8001_hwi.h:342:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/scsi/pm8001/pm80xx_hwi.h:561:32: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Personally I think that it would be better to comment-out the 
residual_count member, so that future developers can know about this 
field and why it is not there.

Anyway,

Reviewed-by: John Garry <john.g.garry@...cle.com>

> ---
> Changes in v2:
>   - Remove unused field residual_count. (James)
> 
> v1:
>   - Link: https://urldefense.com/v3/__https://lore.kernel.org/linux-hardening/aLiMoNzLs1_bu4eJ@kspp/__;!!ACWV5N9M2RV99hQ!OLkXLNymYqQz8gxMAEHXcks7WQ22V0FhWPT1wD58j2Zoq0rgh_0zDnxZnBV0wK-FEGTDmnSbCMbqSVJGScIysEk$
> 
>   drivers/scsi/pm8001/pm8001_hwi.h | 3 ++-
>   drivers/scsi/pm8001/pm80xx_hwi.h | 3 ++-
>   2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/pm8001/pm8001_hwi.h b/drivers/scsi/pm8001/pm8001_hwi.h
> index fc2127dcb58d..170853dbf952 100644
> --- a/drivers/scsi/pm8001/pm8001_hwi.h
> +++ b/drivers/scsi/pm8001/pm8001_hwi.h
> @@ -339,8 +339,9 @@ struct ssp_completion_resp {
>   	__le32	status;
>   	__le32	param;
>   	__le32	ssptag_rescv_rescpad;
> +
> +	/* Must be last --ends in a flexible-array member. */
>   	struct ssp_response_iu  ssp_resp_iu;
> -	__le32	residual_count;
>   } __attribute__((packed, aligned(4)));
>   
>   
> diff --git a/drivers/scsi/pm8001/pm80xx_hwi.h b/drivers/scsi/pm8001/pm80xx_hwi.h
> index eb8fd37b2066..b13d42701b1b 100644
> --- a/drivers/scsi/pm8001/pm80xx_hwi.h
> +++ b/drivers/scsi/pm8001/pm80xx_hwi.h
> @@ -558,8 +558,9 @@ struct ssp_completion_resp {
>   	__le32	status;
>   	__le32	param;
>   	__le32	ssptag_rescv_rescpad;
> +
> +	/* Must be last --ends in a flexible-array member. */
>   	struct ssp_response_iu ssp_resp_iu;
> -	__le32	residual_count;
>   } __attribute__((packed, aligned(4)));
>   
>   #define SSP_RESCV_BIT	0x00010000