3 files changed, 7 insertions, 1 deletions

diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h
index 31f9d75adc5b..2eb88556c5c5 100644
--- a/include/linux/list_bl.h
+++ b/include/linux/list_bl.h
@@ -125,6 +125,11 @@ static inline void hlist_bl_unlock(struct hlist_bl_head *b)
         __bit_spin_unlock(0, (unsigned long *)b);
 }
 
+static inline bool hlist_bl_is_locked(struct hlist_bl_head *b)
+{
+        return bit_spin_is_locked(0, (unsigned long *)b);
+}
+
 /**
  * hlist_bl_for_each_entry      - iterate over list of given type
  * @tpos:       the type * to use as a loop cursor.
diff --git a/include/linux/rculist_bl.h b/include/linux/rculist_bl.h
index cf1244fbf3b6..4f216c59e7db 100644
--- a/include/linux/rculist_bl.h
+++ b/include/linux/rculist_bl.h
@@ -20,7 +20,7 @@ static inline void hlist_bl_set_first_rcu(struct hlist_bl_head *h,
 static inline struct hlist_bl_node *hlist_bl_first_rcu(struct hlist_bl_head *h)
 {
         return (struct hlist_bl_node *)
-                ((unsigned long)rcu_dereference(h->first) & ~LIST_BL_LOCKMASK);
+                ((unsigned long)rcu_dereference_check(h->first, hlist_bl_is_locked(h)) & ~LIST_BL_LOCKMASK);
 }
 
 /**
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index b758ce17b309..9ed2c9a4de45 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -80,6 +80,7 @@ extern void do_trace_rcu_torture_read(char *rcutorturename,
 #define UINT_CMP_LT(a, b)       (UINT_MAX / 2 < (a) - (b))
 #define ULONG_CMP_GE(a, b)      (ULONG_MAX / 2 >= (a) - (b))
 #define ULONG_CMP_LT(a, b)      (ULONG_MAX / 2 < (a) - (b))
+#define ulong2long(a)           (*(long *)(&(a)))
 
 /* Exported common interfaces */