1 files changed, 7 insertions, 4 deletions

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index d32c14de270e..37a642c54871 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -174,10 +174,13 @@ struct rcu_head {
  * code.
  */
 
-#define rcu_assign_pointer(p, v)        ({ \
-                                                smp_wmb(); \
-                                                (p) = (v); \
-                                        })
+#define rcu_assign_pointer(p, v) \
+        ({ \
+                if (!__builtin_constant_p(v) || \
+                    ((v) != NULL)) \
+                        smp_wmb(); \
+                (p) = (v); \
+        })
 
 /**
  * synchronize_sched - block until all CPUs have exited any non-preemptive