diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c
index e640175..0d08d01 100644
--- a/arch/powerpc/lib/feature-fixups.c
+++ b/arch/powerpc/lib/feature-fixups.c
@@ -12,6 +12,7 @@
  *  2 of the License, or (at your option) any later version.
  */
 
+#include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/init.h>
@@ -288,8 +289,8 @@
 
 static void test_cpu_macros(void)
 {
-	extern void ftr_fixup_test_FTR_macros;
-	extern void ftr_fixup_test_FTR_macros_expected;
+	extern u8 ftr_fixup_test_FTR_macros;
+	extern u8 ftr_fixup_test_FTR_macros_expected;
 	unsigned long size = &ftr_fixup_test_FTR_macros_expected -
 			     &ftr_fixup_test_FTR_macros;
 
@@ -301,8 +302,8 @@
 static void test_fw_macros(void)
 {
 #ifdef CONFIG_PPC64
-	extern void ftr_fixup_test_FW_FTR_macros;
-	extern void ftr_fixup_test_FW_FTR_macros_expected;
+	extern u8 ftr_fixup_test_FW_FTR_macros;
+	extern u8 ftr_fixup_test_FW_FTR_macros_expected;
 	unsigned long size = &ftr_fixup_test_FW_FTR_macros_expected -
 			     &ftr_fixup_test_FW_FTR_macros;
 
@@ -314,10 +315,10 @@
 
 static void test_lwsync_macros(void)
 {
-	extern void lwsync_fixup_test;
-	extern void end_lwsync_fixup_test;
-	extern void lwsync_fixup_test_expected_LWSYNC;
-	extern void lwsync_fixup_test_expected_SYNC;
+	extern u8 lwsync_fixup_test;
+	extern u8 end_lwsync_fixup_test;
+	extern u8 lwsync_fixup_test_expected_LWSYNC;
+	extern u8 lwsync_fixup_test_expected_SYNC;
 	unsigned long size = &end_lwsync_fixup_test -
 			     &lwsync_fixup_test;