The nf_nat_irc_hook is an RCU-protected pointer but lacks the
proper __rcu annotation. Add the annotation to ensure the declaration
correctly reflects its usage via rcu_dereference().

Suggested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com>
---
 include/linux/netfilter/nf_conntrack_irc.h | 2 +-
 net/netfilter/nf_conntrack_irc.c           | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/netfilter/nf_conntrack_irc.h b/include/linux/netfilter/nf_conntrack_irc.h
index d02255f721e1..4f3ca5621998 100644
--- a/include/linux/netfilter/nf_conntrack_irc.h
+++ b/include/linux/netfilter/nf_conntrack_irc.h
@@ -8,7 +8,7 @@
 
 #define IRC_PORT	6667
 
-extern unsigned int (*nf_nat_irc_hook)(struct sk_buff *skb,
+extern unsigned int (__rcu *nf_nat_irc_hook)(struct sk_buff *skb,
 				       enum ip_conntrack_info ctinfo,
 				       unsigned int protoff,
 				       unsigned int matchoff,
diff --git a/net/netfilter/nf_conntrack_irc.c b/net/netfilter/nf_conntrack_irc.c
index 5703846bea3b..76c007530b3c 100644
--- a/net/netfilter/nf_conntrack_irc.c
+++ b/net/netfilter/nf_conntrack_irc.c
@@ -30,7 +30,7 @@ static unsigned int dcc_timeout __read_mostly = 300;
 static char *irc_buffer;
 static DEFINE_SPINLOCK(irc_buffer_lock);
 
-unsigned int (*nf_nat_irc_hook)(struct sk_buff *skb,
+unsigned int (__rcu *nf_nat_irc_hook)(struct sk_buff *skb,
 				enum ip_conntrack_info ctinfo,
 				unsigned int protoff,
 				unsigned int matchoff,
-- 
2.43.0