v4.19.13 snapshot.
diff --git a/arch/arc/include/asm/irq.h b/arch/arc/include/asm/irq.h
new file mode 100644
index 0000000..0618b1c
--- /dev/null
+++ b/arch/arc/include/asm/irq.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_ARC_IRQ_H
+#define __ASM_ARC_IRQ_H
+
+/*
+ * ARCv2 can support 240 interrupts in the core interrupts controllers and
+ * 128 interrupts in IDU. Thus 512 virtual IRQs must be enough for most
+ * configurations of boards.
+ * This doesnt affect ARCompact, but we change it to same value
+ */
+#define NR_IRQS 512
+
+/* Platform Independent IRQs */
+#ifdef CONFIG_ISA_ARCV2
+#define IPI_IRQ 19
+#define SOFTIRQ_IRQ 21
+#define FIRST_EXT_IRQ 24
+#endif
+
+#include <linux/interrupt.h>
+#include <asm-generic/irq.h>
+
+extern void arc_init_IRQ(void);
+
+#endif