diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index b3b14352b05e..6f6b1cccc916 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -770,13 +770,8 @@ void update_vsyscall_old(struct timespec *wall_time, struct timespec *wtm,
 
 void update_vsyscall_tz(void)
 {
-	/* Make userspace gettimeofday spin until we're done. */
-	++vdso_data->tb_update_count;
-	smp_mb();
 	vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
 	vdso_data->tz_dsttime = sys_tz.tz_dsttime;
-	smp_mb();
-	++vdso_data->tb_update_count;
 }
 
 static void __init clocksource_init(void)
diff --git a/arch/powerpc/platforms/40x/ppc40x_simple.c b/arch/powerpc/platforms/40x/ppc40x_simple.c
index 969dddcf3320..8f3920e5a046 100644
--- a/arch/powerpc/platforms/40x/ppc40x_simple.c
+++ b/arch/powerpc/platforms/40x/ppc40x_simple.c
@@ -57,7 +57,8 @@ static const char * const board[] __initconst = {
 	"amcc,makalu",
 	"apm,klondike",
 	"est,hotfoot",
-	"plathome,obs600"
+	"plathome,obs600",
+	NULL
 };
 
 static int __init ppc40x_probe(void)