netdev - Re: [PATCH 2/2][next] net: ethtool: Avoid thousands of -Wflex-array-member-not-at-end warnings

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Message-ID: <20241028162131.39e280bd@kernel.org>
Date: Mon, 28 Oct 2024 16:21:31 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Michael Chan <michael.chan@...adcom.com>, Andrew Lunn
 <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Potnuri
 Bharat Teja <bharat@...lsio.com>, Christian Benvenuti <benve@...co.com>,
 Satish Kharat <satishkh@...co.com>, Manish Chopra <manishc@...vell.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH 2/2][next] net: ethtool: Avoid thousands of
 -Wflex-array-member-not-at-end warnings

On Mon, 21 Oct 2024 13:02:27 -0600 Gustavo A. R. Silva wrote:
> Fix 3338 of the following -Wflex-array-member-not-at-end warnings:
> 
> include/linux/ethtool.h:214:38: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

I don't see any change in the number of warnings with W=1:
gcc (GCC) 14.2.1 20240912 (Red Hat 14.2.1-3)
Is it only enabled with W=2?

> Additionally, update the type of some variables in various functions
> that don't access the flexible-array member, changing them to the
> newly created `struct ethtool_link_settings_hdr`.

Why? Please avoid unnecessary code changes.

>  include/linux/ethtool.h                            |  2 +-

This is probably where most of the warnings come from.
Please split the changes to this header file as a separate patch 
for ease of review / validation.