Add cmm_emit_legacy_smp_mb()

[urcu.git] / include / urcu / static / rculfstack.h

diff --git a/include/urcu/static/rculfstack.h b/include/urcu/static/rculfstack.h
index 5bb06b1a366142e1552ea6be01e691a07009862f..b44b9e29fdbad9b73024d653fb992218f221644b 100644 (file)
--- a/include/urcu/static/rculfstack.h
+++ b/include/urcu/static/rculfstack.h
@@ -69,7 +69,9 @@ int _cds_lfs_push_rcu(struct cds_lfs_stack_rcu *s,
                 * uatomic_cmpxchg() implicit memory barrier orders earlier
                 * stores to node before publication.
                 */
-               head = uatomic_cmpxchg(&s->head, old_head, node);
+               cmm_emit_legacy_smp_mb();
+               head = uatomic_cmpxchg_mo(&s->head, old_head, node,
+                                       CMM_SEQ_CST, CMM_SEQ_CST);
                if (old_head == head)
                        break;
        }
@@ -94,7 +96,9 @@ _cds_lfs_pop_rcu(struct cds_lfs_stack_rcu *s)
                if (head) {
                        struct cds_lfs_node_rcu *next = rcu_dereference(head->next);
 
-                       if (uatomic_cmpxchg(&s->head, head, next) == head) {
+                       if (uatomic_cmpxchg_mo(&s->head, head, next,
+                                               CMM_SEQ_CST, CMM_SEQ_CST) == head) {
+                               cmm_emit_legacy_smp_mb();
                                return head;
                        } else {
                                /* Concurrent modification. Retry. */