ipv4/route: avoid unused-but-set-variable warning

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@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20240408074219.3030256-2-arnd@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index c8f76f56dc1653371ca39663f29cc798b062e60d..d36ace160d426f6224f8e692f3b438ae863bb9b9 100644 (file)
--- 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);