netdev - Re: [PATCH net-next v2] ipv4: ip_gre: Fix set but not used warning in ipgre

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Message-ID: <20250120162605.GZ6206@kernel.org>
Date: Mon, 20 Jan 2025 16:26:05 +0000
From: Simon Horman <horms@...nel.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: "David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Kuniyuki Iwashima <kuniyu@...zon.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH net-next v2] ipv4: ip_gre: Fix set but not used warning
 in ipgre_err() if IPv4-only

On Mon, Jan 20, 2025 at 02:12:36PM +0100, Geert Uytterhoeven wrote:
> if CONFIG_NET_IPGRE is enabled, but CONFIG_IPV6 is disabled:
> 
>     net/ipv4/ip_gre.c: In function ‘ipgre_err’:
>     net/ipv4/ip_gre.c:144:22: error: variable ‘data_len’ set but not used [-Werror=unused-but-set-variable]
>       144 |         unsigned int data_len = 0;
> 	  |                      ^~~~~~~~
> 
> Fix this by moving all data_len processing inside the IPV6-only section
> that uses its result.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202501121007.2GofXmh5-lkp@intel.com/
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
> v2:
>   - Do not use the ternary operator,
>   - Target net-next.

Thanks Geert,

This has been bothering me too.

Reviewed-by: Simon Horman <horms@...nel.org>