--- zzzz-none-000/linux-4.9.279/kernel/irq/chip.c	2021-08-08 06:38:54.000000000 +0000
+++ puma7-arm-6591-750/linux-4.9.279/kernel/irq/chip.c	2023-02-08 10:58:16.000000000 +0000
@@ -10,6 +10,12 @@
  * Detailed information is available in Documentation/DocBook/genericirq
  */
 
+/*
+ * Includes Intel Corporation's changes/modifications dated: 2012.
+ * Changed/modified portions - Copyright © 2012 , Intel Corporation.
+ */
+
+
 #include <linux/irq.h>
 #include <linux/msi.h>
 #include <linux/module.h>
@@ -259,6 +265,14 @@
 	}
 }
 
+void irq_ack(struct irq_desc *desc)
+{
+    if (desc->irq_data.chip->irq_ack)
+    {
+        desc->irq_data.chip->irq_ack(&desc->irq_data);
+    }
+}
+
 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
 {
 	if (desc->irq_data.chip->irq_enable)