linux-kernel - Re: [PATCH] ipv4/route: avoid unused-but-set-variable warning

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Date: Fri, 22 Mar 2024 09:10:39 -0600
From: David Ahern <dsahern@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: Arnd Bergmann <arnd@...db.de>, Kunwu Chan <chentao@...inos.cn>,
 Joel Granados <joel.granados@...il.com>,
 Zhengchao Shao <shaozhengchao@...wei.com>,
 Wangyang Guo <wangyang.guo@...el.com>, Kyle Zeng <zengyhkyle@...il.com>,
 Beniamino Galvani <b.galvani@...il.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv4/route: avoid unused-but-set-variable warning

On 3/22/24 7:18 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The log_martians variable is only used in an #ifdef, causing a 'make W=1'
> warning with gcc:
> 
> net/ipv4/route.c: In function 'ip_rt_send_redirect':
> net/ipv4/route.c:880:13: error: variable 'log_martians' set but not used [-Werror=unused-but-set-variable]
> 
> Change the #ifdef to an equivalent IS_ENABLED() to let the compiler
> see where the variable is used.
> 
> Fixes: 30038fc61adf ("net: ip_rt_send_redirect() optimization")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  net/ipv4/route.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>