diff --git a/[refs] b/[refs]
index 60b55d17e851..da4e05fe63ce 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d2dbe08ddceb4ba2b274abb84326d7e69d454e5c
+refs/heads/master: cc8ef6eb21e964b1c5eb97b2d0e8ac9893e1bf86
diff --git a/trunk/include/linux/kernel.h b/trunk/include/linux/kernel.h
index 3fc9f5aab5f8..328bca609b9b 100644
--- a/trunk/include/linux/kernel.h
+++ b/trunk/include/linux/kernel.h
@@ -734,6 +734,10 @@ struct sysinfo {
 /* Force a compilation error if condition is constant and true */
 #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
 
+/* Force a compilation error if a constant expression is not a power of 2 */
+#define BUILD_BUG_ON_NOT_POWER_OF_2(n)			\
+	BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
+
 /* Force a compilation error if condition is true, but also produce a
    result (of value 0 and type size_t), so the expression can be used
    e.g. in a structure initializer (or where-ever else comma expressions