From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 5 Jun 2013 19:24:00 +0000 (-0400)
Subject: rculist: identify stores to shared pointers
X-Git-Url: http://git.lttng.org/?p=userspace-rcu.git;a=commitdiff_plain;h=4b677847e8454cc75399bef6d380eb9df38ee3f9

rculist: identify stores to shared pointers

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu/rculist.h b/urcu/rculist.h
index 3604a96..e67503d 100644
--- a/urcu/rculist.h
+++ b/urcu/rculist.h
@@ -33,11 +33,12 @@
  */
 static inline void cds_list_add_rcu(struct cds_list_head *newp, struct cds_list_head *head)
 {
-	newp->next = head->next;
+	struct cds_list_head *first = head->next;
+
+	newp->next = first;
 	newp->prev = head;
-	cmm_smp_wmb();
-	head->next->prev = newp;
-	head->next = newp;
+	rcu_assign_pointer(head->next, newp);
+	first->prev = newp;
 }
 
 /* replace an old entry atomically.
@@ -54,7 +55,7 @@ static inline void cds_list_replace_rcu(struct cds_list_head *old, struct cds_li
 static inline void cds_list_del_rcu(struct cds_list_head *elem)
 {
 	elem->next->prev = elem->prev;
-	elem->prev->next = elem->next;
+	CMM_STORE_SHARED(elem->prev->next, elem->next);
 }
 
 /*