netdev - [PATCH net 1/4] ipv6: silence compilation warning for non-IPV6 builds

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Date:   Tue,  2 Feb 2021 15:55:41 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Pablo Neira Ayuso <pablo@...filter.org>
Cc:     Leon Romanovsky <leonro@...dia.com>, coreteam@...filter.org,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Westphal <fw@...len.de>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Julian Anastasov <ja@....bg>, linux-kernel@...r.kernel.org,
        lvs-devel@...r.kernel.org, Matteo Croce <mcroce@...hat.com>,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        Simon Horman <horms@...ge.net.au>
Subject: [PATCH net 1/4] ipv6: silence compilation warning for non-IPV6 builds

From: Leon Romanovsky <leonro@...dia.com>

The W=1 compilation of allmodconfig generates the following warning:

net/ipv6/icmp.c:448:6: warning: no previous prototype for 'icmp6_send' [-Wmissing-prototypes]
  448 | void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
      |      ^~~~~~~~~~

In such configuration, the icmp6_send() is not used outside of icmp.c, so close
its EXPORT_SYMBOL and add "static" word to limit the scope.

Fixes: cc7a21b6fbd9 ("ipv6: icmp6: avoid indirect call for icmpv6_send()")
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 net/ipv6/icmp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index f3d05866692e..5d4232b492dc 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -445,6 +445,9 @@ static int icmp6_iif(const struct sk_buff *skb)
 /*
  *	Send an ICMP message in response to a packet in error
  */
+#if !IS_BUILTIN(CONFIG_IPV6)
+static
+#endif
 void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
 		const struct in6_addr *force_saddr)
 {
@@ -634,7 +637,10 @@ void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
 out_bh_enable:
 	local_bh_enable();
 }
+
+#if IS_BUILTIN(CONFIG_IPV6)
 EXPORT_SYMBOL(icmp6_send);
+#endif

 /* Slightly more convenient version of icmp6_send.
  */
--
2.29.2