commit e0ad61ec867fdd262804afa7a68e11fc9930c2b9
author Eric Dumazet <eric.dumazet@gmail.com> Mon Oct 25 21:02:28 2010 +0000
committer David S. Miller <davem@davemloft.net> Wed Oct 27 11:37:31 2010 -0700
tree f59451cdfa2086757e55b18b87167b0fef3de2c1
parent 1c31720a74e19bb57f301350a3b03210fa2ba9e3

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>

net/ipv4/protocol.c

diff --git a/net/ipv4/protocol.c b/net/ipv4/protocol.c
index 65699c2..9ae5c01 100644
--- a/net/ipv4/protocol.c
+++ b/net/ipv4/protocol.c
@@ -28,7 +28,7 @@
 #include <linux/spinlock.h>
 #include <net/protocol.h>
 
-const struct net_protocol *inet_protos[MAX_INET_PROTOS] __read_mostly;
+const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly;
 
 /*
  *	Add a protocol handler to the hash tables
@@ -38,7 +38,8 @@
 {
 	int hash = protocol & (MAX_INET_PROTOS - 1);
 
-	return !cmpxchg(&inet_protos[hash], NULL, prot) ? 0 : -1;
+	return !cmpxchg((const struct net_protocol **)&inet_protos[hash],
+			NULL, prot) ? 0 : -1;
 }
 EXPORT_SYMBOL(inet_add_protocol);
 
@@ -50,7 +51,8 @@
 {
 	int ret, hash = protocol & (MAX_INET_PROTOS - 1);
 
-	ret = (cmpxchg(&inet_protos[hash], prot, NULL) == prot) ? 0 : -1;
+	ret = (cmpxchg((const struct net_protocol **)&inet_protos[hash],
+		       prot, NULL) == prot) ? 0 : -1;
 
 	synchronize_net();