v4.19.13 snapshot.
diff --git a/include/linux/irqhandler.h b/include/linux/irqhandler.h
new file mode 100644
index 0000000..1e6f4e7
--- /dev/null
+++ b/include/linux/irqhandler.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_IRQHANDLER_H
+#define _LINUX_IRQHANDLER_H
+
+/*
+ * Interrupt flow handler typedefs are defined here to avoid circular
+ * include dependencies.
+ */
+
+struct irq_desc;
+struct irq_data;
+typedef void (*irq_flow_handler_t)(struct irq_desc *desc);
+typedef void (*irq_preflow_handler_t)(struct irq_data *data);
+
+#endif