diff -uprN -X linux-2.6.19-vanilla/Documentation/dontdiff linux-2.6.19-vanilla/include/linux/power_of_2.h linux-2.6.19-changed/include/linux/power_of_2.h
--- linux-2.6.19-vanilla/include/linux/power_of_2.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19-changed/include/linux/power_of_2.h	2007-01-10 12:42:03.000000000 +0100
@@ -0,0 +1,20 @@
+static inline bool is_power_of_2(int i)
+{
+	return i > 0 && (i & (i - 1)) == 0;
+}
+
+static inline int round_up_to_power_of_2(int i)
+{
+	while ((i & (i - 1)) != 0)
+		i += i & ~(i - 1);
+	
+	return i;
+}
+
+static inline int round_down_to_power_of_2(int i)
+{
+	while (i & (i - 1))
+		i &= (i - 1);
+	
+	return i;
+}