diff --git a/[refs] b/[refs]
index 189182d5e07b..b6ccf14bc5b3 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 582539e5a0480f1e00e3b9ffbe50bd5b2f59a16f
+refs/heads/master: de9330d13eac1f331e63ab1d18c506365b0151f3
diff --git a/trunk/include/linux/log2.h b/trunk/include/linux/log2.h
index c8cf5e8ef171..25b808631cd9 100644
--- a/trunk/include/linux/log2.h
+++ b/trunk/include/linux/log2.h
@@ -190,4 +190,20 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
 	__rounddown_pow_of_two(n)		\
  )
 
+/**
+ * order_base_2 - calculate the (rounded up) base 2 order of the argument
+ * @n: parameter
+ *
+ * The first few values calculated by this routine:
+ *  ob2(0) = 0
+ *  ob2(1) = 0
+ *  ob2(2) = 1
+ *  ob2(3) = 2
+ *  ob2(4) = 2
+ *  ob2(5) = 3
+ *  ... and so on.
+ */
+
+#define order_base_2(n) ilog2(roundup_pow_of_two(n))
+
 #endif /* _LINUX_LOG2_H */