X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Flog2.h;h=25b808631cd92c50d10cf6a31b2d9b9942b62ac9;hb=7597bc94d6f3bdccb086ac7f2ad91292fdaee2a4;hp=c8cf5e8ef1717d40cde2768fd0608f29924b1545;hpb=c548f08a4f7b89b93c805e0c4024b8302afa7121;p=linux-2.6-omap-h63xx.git

diff --git a/include/linux/log2.h b/include/linux/log2.h
index c8cf5e8ef17..25b808631cd 100644
--- a/include/linux/log2.h
+++ b/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 */