powerpc: Fix feature-fixup tests for gcc 4.5

The feature-fixup test declare some extern void variables and then take
their addresses.  Fix this by declaring them as extern u8 instead.

Fixes these warnings (treated as errors):

  CC      arch/powerpc/lib/feature-fixups.o
cc1: warnings being treated as errors
arch/powerpc/lib/feature-fixups.c: In function 'test_cpu_macros':
arch/powerpc/lib/feature-fixups.c:293:23: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:294:9: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:297:2: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:297:2: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c: In function 'test_fw_macros':
arch/powerpc/lib/feature-fixups.c:306:23: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:307:9: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:310:2: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:310:2: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c: In function 'test_lwsync_macros':
arch/powerpc/lib/feature-fixups.c:321:23: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:322:9: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:326:3: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:326:3: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:329:3: error: taking address of expression of type 'void'
arch/powerpc/lib/feature-fixups.c:329:3: error: taking address of expression of type 'void'

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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_alternative_case_with_external_branch(void)
 
 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_cpu_macros(void)
 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_fw_macros(void)
 
 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;