linux-kernel - Re: [PATCH][next] net: inet_sock.h: Avoid thousands of -Wflex-array-member-not-at-end warnings

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Message-ID: <20251023172518.3f370477@kernel.org>
Date: Thu, 23 Oct 2025 17:25:18 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
 <horms@...nel.org>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] net: inet_sock.h: Avoid thousands of
 -Wflex-array-member-not-at-end warnings

On Tue, 21 Oct 2025 12:43:30 +0100 Gustavo A. R. Silva wrote:
>  struct ip_options_data {
> -	struct ip_options_rcu	opt;
> -	char			data[40];
> +	TRAILING_OVERLAP(struct ip_options_rcu, opt, opt.__data,
> +			 char			data[40];
> +	);
>  };

Is there a way to reserve space for flexible length array on the stack
without resorting to any magic macros? This struct has total of 5 users.
-- 
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