netdev - [PATCH 2/2] ipv4/route: avoid unused-but-set-variable warning

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Date: Mon,  8 Apr 2024 09:42:03 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: "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>
Cc: Arnd Bergmann <arnd@...db.de>,
	Kunwu Chan <chentao@...inos.cn>,
	Zhengchao Shao <shaozhengchao@...wei.com>,
	Sriram Yagnaraman <sriram.yagnaraman@....tech>,
	Maxime Bizon <mbizon@...ebox.fr>,
	Joel Granados <joel.granados@...il.com>,
	Kyle Zeng <zengyhkyle@...il.com>,
	Beniamino Galvani <b.galvani@...il.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] ipv4/route: avoid unused-but-set-variable warning

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")
Reviewed-by: David Ahern <dsahern@...nel.org>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 net/ipv4/route.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index c8f76f56dc16..d36ace160d42 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -926,13 +926,11 @@ void ip_rt_send_redirect(struct sk_buff *skb)
 		icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw);
 		peer->rate_last = jiffies;
 		++peer->n_redirects;
-#ifdef CONFIG_IP_ROUTE_VERBOSE
-		if (log_martians &&
+		if (IS_ENABLED(CONFIG_IP_ROUTE_VERBOSE) && log_martians &&
 		    peer->n_redirects == ip_rt_redirect_number)
 			net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n",
 					     &ip_hdr(skb)->saddr, inet_iif(skb),
 					     &ip_hdr(skb)->daddr, &gw);
-#endif
 	}
 out_put_peer:
 	inet_putpeer(peer);
-- 
2.39.2