v4.19.13 snapshot.
diff --git a/include/linux/irqnr.h b/include/linux/irqnr.h
new file mode 100644
index 0000000..3496baa
--- /dev/null
+++ b/include/linux/irqnr.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_IRQNR_H
+#define _LINUX_IRQNR_H
+
+#include <uapi/linux/irqnr.h>
+
+
+extern int nr_irqs;
+extern struct irq_desc *irq_to_desc(unsigned int irq);
+unsigned int irq_get_next_irq(unsigned int offset);
+
+# define for_each_irq_desc(irq, desc) \
+ for (irq = 0, desc = irq_to_desc(irq); irq < nr_irqs; \
+ irq++, desc = irq_to_desc(irq)) \
+ if (!desc) \
+ ; \
+ else
+
+
+# define for_each_irq_desc_reverse(irq, desc) \
+ for (irq = nr_irqs - 1, desc = irq_to_desc(irq); irq >= 0; \
+ irq--, desc = irq_to_desc(irq)) \
+ if (!desc) \
+ ; \
+ else
+
+# define for_each_active_irq(irq) \
+ for (irq = irq_get_next_irq(0); irq < nr_irqs; \
+ irq = irq_get_next_irq(irq + 1))
+
+#define for_each_irq_nr(irq) \
+ for (irq = 0; irq < nr_irqs; irq++)
+
+#endif