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-rw-r--r--arch/s390/lib/delay.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c
index 0953cee05ef..6ccb9fab055 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();
+}