1 files changed, 21 insertions, 2 deletions

diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index 4106721c4e5e..45a0a9e81478 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -19,6 +19,21 @@
  */
 
 /*
+ * INIT_LIST_HEAD_RCU - Initialize a list_head visible to RCU readers
+ * @list: list to be initialized
+ *
+ * You should instead use INIT_LIST_HEAD() for normal initialization and
+ * cleanup tasks, when readers have no access to the list being initialized.
+ * However, if the list being initialized is visible to readers, you
+ * need to keep the compiler from being too mischievous.
+ */
+static inline void INIT_LIST_HEAD_RCU(struct list_head *list)
+{
+        ACCESS_ONCE(list->next) = list;
+        ACCESS_ONCE(list->prev) = list;
+}
+
+/*
  * return the ->next pointer of a list_head in an rcu safe
  * way, we must not access it directly
  */
@@ -191,9 +206,13 @@ static inline void list_splice_init_rcu(struct list_head *list,
         if (list_empty(list))
                 return;
 
-        /* "first" and "last" tracking list, so initialize it. */
+        /*
+         * "first" and "last" tracking list, so initialize it.  RCU readers
+         * have access to this list, so we must use INIT_LIST_HEAD_RCU()
+         * instead of INIT_LIST_HEAD().
+         */
 
-        INIT_LIST_HEAD(list);
+        INIT_LIST_HEAD_RCU(list);
 
         /*
          * At this point, the list body still points to the source list.