diff --git a/arch/mn10300/kernel/mn10300_ksyms.c b/arch/mn10300/kernel/mn10300_ksyms.c
index 544ee1a..f9eb975 100644
--- a/arch/mn10300/kernel/mn10300_ksyms.c
+++ b/arch/mn10300/kernel/mn10300_ksyms.c
@@ -34,7 +34,9 @@
 extern u64 __ashldi3(u64, unsigned);
 extern u64 __lshrdi3(u64, unsigned);
 extern s64 __negdi2(s64);
+extern int __ucmpdi2(u64, u64);
 EXPORT_SYMBOL(__ashrdi3);
 EXPORT_SYMBOL(__ashldi3);
 EXPORT_SYMBOL(__lshrdi3);
 EXPORT_SYMBOL(__negdi2);
+EXPORT_SYMBOL(__ucmpdi2);
diff --git a/arch/mn10300/lib/Makefile b/arch/mn10300/lib/Makefile
index fdfa9ec..0cd2346 100644
--- a/arch/mn10300/lib/Makefile
+++ b/arch/mn10300/lib/Makefile
@@ -4,4 +4,4 @@
 
 lib-y = delay.o usercopy.o checksum.o bitops.o memcpy.o memmove.o memset.o
 lib-y += do_csum.o
-lib-y += __ashldi3.o __ashrdi3.o __lshrdi3.o negdi2.o
+lib-y += __ashldi3.o __ashrdi3.o __lshrdi3.o negdi2.o __ucmpdi2.o
diff --git a/arch/mn10300/lib/__ucmpdi2.S b/arch/mn10300/lib/__ucmpdi2.S
new file mode 100644
index 0000000..60dcbdf
--- /dev/null
+++ b/arch/mn10300/lib/__ucmpdi2.S
@@ -0,0 +1,43 @@
+/* __ucmpdi2.S: 64-bit unsigned compare
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+
+        .text
+        .p2align	4
+
+###############################################################################
+#
+# int __ucmpdi2(unsigned long long a [D0:D1],
+#		unsigned long long b [(SP,12),(SP,16)])
+#
+# - returns 0, 1, or 2 as a <, =, > b respectively.
+#
+###############################################################################
+        .globl		__ucmpdi2
+        .type		__ucmpdi2,@function
+__ucmpdi2:
+	mov		(12,sp),a0		# b.lsw
+	mov		(16,sp),a1		# b.msw
+
+	sub		a0,d0
+	subc		a1,d1			# may clear Z, never sets it
+	bne		__ucmpdi2_differ	# a.msw != b.msw
+	mov		+1,d0
+	rets
+
+__ucmpdi2_differ:
+	# C flag is set if LE, clear if GE
+	subc		d0,d0			# -1 if LE, 0 if GE
+	add		+1,d0			#  0 if LE, 1 if GE
+	add		d0,d0			#  0 if LE, 2 if GE
+	rets
+
+	.size		__ucmpdi2, .-__ucmpdi2