From 6727e543c7d81a6828e89729887d2ceb561f5960 Mon Sep 17 00:00:00 2001
From: riastradh <riastradh@NetBSD.org>
Date: Wed, 6 Aug 2014 14:05:08 +0000
Subject: [PATCH] Add rounddown_pow_of_two.

---
 sys/external/bsd/drm2/include/linux/log2.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/sys/external/bsd/drm2/include/linux/log2.h b/sys/external/bsd/drm2/include/linux/log2.h
index cf328b54c42f..0c2ee4085d7a 100644
--- a/sys/external/bsd/drm2/include/linux/log2.h
+++ b/sys/external/bsd/drm2/include/linux/log2.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: log2.h,v 1.4 2014/07/16 20:59:58 riastradh Exp $	*/
+/*	$NetBSD: log2.h,v 1.5 2014/08/06 14:05:08 riastradh Exp $	*/
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -58,6 +58,14 @@ roundup_pow_of_two(unsigned long n)
 	return (n + 1);
 }
 
+static inline unsigned long
+rounddown_pow_of_two(unsigned long n)
+{
+
+	/* XXX fls64 is not fls_ulong, but it'll do for now.  */
+	return (1UL << (fls64(n) - 1));
+}
+
 static inline unsigned
 order_base_2(unsigned long n)
 {