diff --git a/[refs] b/[refs]
index 9b50184c88a8..56171010e515 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 95b68dec0d52c7b8fea3698b3938cf3ab936436b
+refs/heads/master: 2027d1abc25ff770cc3bc936abd33570ce85d85a
diff --git a/trunk/include/linux/idr.h b/trunk/include/linux/idr.h
index 9a2d762124de..1af61d23be36 100644
--- a/trunk/include/linux/idr.h
+++ b/trunk/include/linux/idr.h
@@ -15,6 +15,7 @@
 #include <linux/types.h>
 #include <linux/bitops.h>
 #include <linux/init.h>
+#include <linux/rcupdate.h>
 
 #if BITS_PER_LONG == 32
 # define IDR_BITS 5
@@ -51,6 +52,7 @@ struct idr_layer {
 	unsigned long		 bitmap; /* A zero bit means "space here" */
 	struct idr_layer	*ary[1<<IDR_BITS];
 	int			 count;	 /* When zero, we can release it */
+	struct rcu_head		 rcu_head;
 };
 
 struct idr {