[PATCH][next] net: atlantic: Aavoid -Wflex-array-member-not-at-end warnings

[PATCH][next] net: atlantic: Aavoid -Wflex-array-member-not-at-end warnings

[Gustavo A. R. Silva]

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Move the conflicting declaration to the end of the structure. Notice
that `struct hw_atl_utils_fw_rpc` ends in a flexible-array member
through `struct offload_info fw2x_offloads;`

Fix the following warnings:
drivers/net/ethernet/aquantia/atlantic/aq_hw.h:197:36: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
drivers/net/ethernet/aquantia/atlantic/hw_atl/../aq_hw.h:197:36: 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>
---
 drivers/net/ethernet/aquantia/atlantic/aq_hw.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_hw.h b/drivers/net/ethernet/aquantia/atlantic/aq_hw.h
index f010bda61c96..a66cd784f90e 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_hw.h
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_hw.h
@@ -194,10 +194,12 @@ struct aq_hw_s {
 	u32 rpc_addr;
 	u32 settings_addr;
 	u32 rpc_tid;
-	struct hw_atl_utils_fw_rpc rpc;
 	s64 ptp_clk_offset;
 	u16 phy_id;
 	void *priv;
+
+	/* Must be last - ends in a flex-array member. */
+	struct hw_atl_utils_fw_rpc rpc;
 };
 
 struct aq_ring_s;
-- 
2.34.1

Re: [EXTERNAL] [PATCH][next] net: atlantic: Aavoid -Wflex-array-member-not-at-end warnings

[Igor Russkikh]

On 8/5/2024 5:32 PM, Gustavo A. R. Silva wrote:
> -Wflex-array-member-not-at-end was introduced in GCC-14, and we are
> getting ready to enable it, globally. Move the conflicting declaration to
> the end of the structure. Notice that `struct hw_atl_utils_fw_rpc` ends in
> a flexible-array member
> 
> Fix the following warnings:
> 
> drivers/net/ethernet/aquantia/atlantic/aq_hw.h:197:36: warning: structure
> containing a flexible array member is not at the end of another structure
> [-Wflex-array-member-not-at-end]
> 
> drivers/net/ethernet/aquantia/atlantic/hw_atl/../aq_hw.h:197:36: warning:
> structure containing a flexible array member is not at the end of another
> structure [-Wflex-array-member-not-at-end]

Hi Gustavo!

I was abit curious about this variable length structure, because it looks strange and not actually used by driver.

I've cross checked, and its really some outdated declaration. The structure is never used as as a flex sized struct.

So better would be to do just this:

--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.h
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.h
@@ -226,7 +226,6 @@ struct __packed offload_info {
        struct offload_port_info ports;
        struct offload_ka_info kas;
        struct offload_rr_info rrs;
-       u8 buf[];
 };

Let me know if you want to submit this, or I can do this as well.

Regards,
  Igor

Re: [EXTERNAL] [PATCH][next] net: atlantic: Aavoid -Wflex-array-member-not-at-end warnings

[Gustavo A. R. Silva]

On 06/08/24 03:42, Igor Russkikh wrote:
> 
> 
> On 8/5/2024 5:32 PM, Gustavo A. R. Silva wrote:
>> -Wflex-array-member-not-at-end was introduced in GCC-14, and we are
>> getting ready to enable it, globally. Move the conflicting declaration to
>> the end of the structure. Notice that `struct hw_atl_utils_fw_rpc` ends in
>> a flexible-array member
>>
>> Fix the following warnings:
>>
>> drivers/net/ethernet/aquantia/atlantic/aq_hw.h:197:36: warning: structure
>> containing a flexible array member is not at the end of another structure
>> [-Wflex-array-member-not-at-end]
>>
>> drivers/net/ethernet/aquantia/atlantic/hw_atl/../aq_hw.h:197:36: warning:
>> structure containing a flexible array member is not at the end of another
>> structure [-Wflex-array-member-not-at-end]
> 
> Hi Gustavo!
> 
> I was abit curious about this variable length structure, because it looks strange and not actually used by driver.
> 
> I've cross checked, and its really some outdated declaration. The structure is never used as as a flex sized struct.

Oh, this is great to know. Thanks for looking into this!

> 
> So better would be to do just this:
> 
> --- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.h
> +++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.h
> @@ -226,7 +226,6 @@ struct __packed offload_info {
>          struct offload_port_info ports;
>          struct offload_ka_info kas;
>          struct offload_rr_info rrs;
> -       u8 buf[];
>   };
> 
> Let me know if you want to submit this, or I can do this as well.
> 

Feel free to send a patch if you wish. :)

Thanks!
--
Gustavo