diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 11c32b228f51..0e1925104fcf 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -642,7 +642,7 @@ static int stp_sync_clock(void *data)
 		atomic_dec(&sync->cpus);
 		/* Wait for in_sync to be set. */
 		while (READ_ONCE(sync->in_sync) == 0)
-			__udelay(1);
+			;
 	}
 	if (sync->in_sync != 1)
 		/* Didn't work. Clear per-cpu in sync bit again. */