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

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Message-ID: <8e19df11-a64b-4fae-863a-c141612a3d36@embeddedor.com>
Date: Tue, 6 Aug 2024 07:42:21 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Igor Russkikh <irusskikh@...vell.com>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [EXTERNAL] [PATCH][next] net: atlantic: Aavoid
 -Wflex-array-member-not-at-end warnings



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 I've cross checked, and its really some outdated declaration.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