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

Gustavo A. R. Silva posted 1 patch 5 months ago
There is a newer version of this series
drivers/scsi/pm8001/pm8001_hwi.h | 3 ++-
drivers/scsi/pm8001/pm80xx_hwi.h | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)
[PATCH v2][next] scsi: pm80xx: Avoid -Wflex-array-member-not-at-end warnings
Posted by Gustavo A. R. Silva 5 months ago 
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@kernel.org>
---
Changes in v2:
 - Remove unused field residual_count. (James)

v1:
 - Link: https://lore.kernel.org/linux-hardening/aLiMoNzLs1_bu4eJ@kspp/

 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
-- 
2.43.0
Re: [PATCH v2][next] scsi: pm80xx: Avoid -Wflex-array-member-not-at-end warnings
Posted by John Garry 5 months ago 
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@kernel.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@oracle.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
Re: [PATCH v2][next] scsi: pm80xx: Avoid -Wflex-array-member-not-at-end warnings
Posted by Gustavo A. R. Silva 5 months ago 

On 9/5/25 09:05, John Garry wrote:
> 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@kernel.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.

I agree. I'll send v3.

> 
> Anyway,
> 
> Reviewed-by: John Garry <john.g.garry@oracle.com>

Thanks!
-Gustavo
Re: [PATCH v2][next] scsi: pm80xx: Avoid -Wflex-array-member-not-at-end warnings
Posted by Jinpu Wang 5 months ago 
On Thu, Sep 4, 2025 at 4:54 PM Gustavo A. R. Silva
<gustavoars@kernel.org> 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@kernel.org>
oh, indeed, v1 is wrong, and v2 is right fix.
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
> ---
> Changes in v2:
>  - Remove unused field residual_count. (James)
>
> v1:
>  - Link: https://lore.kernel.org/linux-hardening/aLiMoNzLs1_bu4eJ@kspp/
>
>  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
> --
> 2.43.0
>

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