Merge branch 'tipc-next'

Ying Xue says:

====================
tipc: convert name table read-write lock to RCU

Now TIPC name table is statically allocated and is protected with a
Read-Write lock. To enhance the performance of TIPC name table lookup,
we are going to involve RCU lock to protect the name table. As a
consequence, it becomes lockless to concurrently look up name table on
read side. However, before the conversion can be successfully made,
the following two things must be first done:

- change allocation way of name table from static to dynamic
- fix several incorrect locking policy issues
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index 372ad5e0dcb8..aa79b3c24f66 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -542,6 +542,15 @@ static inline void hlist_add_behind_rcu(struct hlist_node *n,
 	     pos = hlist_entry_safe(rcu_dereference_bh((pos)->member.next),\
 			typeof(*(pos)), member))
 
+/**
+ * hlist_for_each_entry_from_rcu - iterate over a hlist continuing from current point
+ * @pos:	the type * to use as a loop cursor.
+ * @member:	the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_from_rcu(pos, member)			\
+	for (; pos;							\
+	     pos = hlist_entry_safe(rcu_dereference((pos)->member.next),\
+			typeof(*(pos)), member))
 
 #endif	/* __KERNEL__ */
 #endif