1 files changed, 54 insertions, 0 deletions

diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index b84b32fd5df1..d432489e7109 100644
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -71,6 +71,60 @@ struct inet_peer_base {
         int                     total;
 };
 
+#define INETPEER_BASE_BIT       0x1UL
+
+static inline struct inet_peer *inetpeer_ptr(unsigned long val)
+{
+        BUG_ON(val & INETPEER_BASE_BIT);
+        return (struct inet_peer *) val;
+}
+
+static inline struct inet_peer_base *inetpeer_base_ptr(unsigned long val)
+{
+        if (!(val & INETPEER_BASE_BIT))
+                return NULL;
+        val &= ~INETPEER_BASE_BIT;
+        return (struct inet_peer_base *) val;
+}
+
+static inline bool inetpeer_ptr_is_peer(unsigned long val)
+{
+        return !(val & INETPEER_BASE_BIT);
+}
+
+static inline void __inetpeer_ptr_set_peer(unsigned long *val, struct inet_peer *peer)
+{
+        /* This implicitly clears INETPEER_BASE_BIT */
+        *val = (unsigned long) peer;
+}
+
+static inline bool inetpeer_ptr_set_peer(unsigned long *ptr, struct inet_peer *peer)
+{
+        unsigned long val = (unsigned long) peer;
+        unsigned long orig = *ptr;
+
+        if (!(orig & INETPEER_BASE_BIT) || !val ||
+            cmpxchg(ptr, orig, val) != orig)
+                return false;
+        return true;
+}
+
+static inline void inetpeer_init_ptr(unsigned long *ptr, struct inet_peer_base *base)
+{
+        *ptr = (unsigned long) base | INETPEER_BASE_BIT;
+}
+
+static inline void inetpeer_transfer_peer(unsigned long *to, unsigned long *from)
+{
+        unsigned long val = *from;
+
+        *to = val;
+        if (inetpeer_ptr_is_peer(val)) {
+                struct inet_peer *peer = inetpeer_ptr(val);
+                atomic_inc(&peer->refcnt);
+        }
+}
+
 extern void inet_peer_base_init(struct inet_peer_base *);
 
 void                    inet_initpeers(void) __init;