net: add __rcu annotations to protocol

Add __rcu annotations to :
        struct net_protocol *inet_protos
        struct net_protocol *inet6_protos

And use appropriate casts to reduce sparse warnings if
CONFIG_SPARSE_RCU_POINTER=y

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 3 deletions

diff --git a/net/ipv6/protocol.c b/net/ipv6/protocol.c
index 9bb936ae245..9a7978fdc02 100644
--- a/net/ipv6/protocol.c
+++ b/net/ipv6/protocol.c
@@ -25,13 +25,14 @@
 #include <linux/spinlock.h>
 #include <net/protocol.h>
 
-const struct inet6_protocol *inet6_protos[MAX_INET_PROTOS] __read_mostly;
+const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
 
 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
 {
         int hash = protocol & (MAX_INET_PROTOS - 1);
 
-        return !cmpxchg(&inet6_protos[hash], NULL, prot) ? 0 : -1;
+        return !cmpxchg((const struct inet6_protocol **)&inet6_protos[hash],
+                        NULL, prot) ? 0 : -1;
 }
 EXPORT_SYMBOL(inet6_add_protocol);
 
@@ -43,7 +44,8 @@ int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol
 {
         int ret, hash = protocol & (MAX_INET_PROTOS - 1);
 
-        ret = (cmpxchg(&inet6_protos[hash], prot, NULL) == prot) ? 0 : -1;
+        ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[hash],
+                       prot, NULL) == prot) ? 0 : -1;
 
         synchronize_net();