X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=include%2Flinux%2Flog2.h;h=fd7ff3d91e6a920ff084beca09d10b5b9abba981;hp=c8cf5e8ef1717d40cde2768fd0608f29924b1545;hb=13c07b0286d340275f2d97adf085cecda37ede37;hpb=4c5cdb1e1f2a502069f57a60b5c6b97b8106c73c

diff --git a/include/linux/log2.h b/include/linux/log2.h
index c8cf5e8ef171..fd7ff3d91e6a 100644
--- a/include/linux/log2.h
+++ b/include/linux/log2.h
@@ -185,9 +185,24 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
 #define rounddown_pow_of_two(n)			\
 (						\
 	__builtin_constant_p(n) ? (		\
-		(n == 1) ? 0 :			\
 		(1UL << ilog2(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 */