1 files changed, 13 insertions, 0 deletions
diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c
index 0953cee05efc..6ccb9fab055a 100644
--- a/arch/s390/lib/delay.c
+++ b/arch/s390/lib/delay.c
@@ -92,3 +92,16 @@ out:
 	local_irq_restore(flags);
 	preempt_enable();
 }
+
+/*
+ * Simple udelay variant. To be used on startup and reboot
+ * when the interrupt handler isn't working.
+ */
+void udelay_simple(unsigned long usecs)
+{
+	u64 end;
+
+	end = get_clock() + ((u64) usecs << 12);
+	while (get_clock() < end)
+		cpu_relax();
+}