--- zzzz-none-000/linux-4.4.271/kernel/irq/irqdesc.c	2021-06-03 06:22:09.000000000 +0000
+++ maple-fsgw-759/linux-4.4.271/kernel/irq/irqdesc.c	2023-12-20 10:37:38.000000000 +0000
@@ -15,14 +15,62 @@
 #include <linux/radix-tree.h>
 #include <linux/bitmap.h>
 #include <linux/irqdomain.h>
+#include <linux/module.h>
+#ifdef CONFIG_STOPWATCH_HARD_IRQ
+#define __STOPWATCH_USE__
+#endif
+#include <linux/stopwatch.h>
 
 #include "internals.h"
 
+DEFINE_STOPWATCH_ARRAY(hardirq, NR_IRQS + 2);
+
 /*
  * lockdep: we want to handle all irq_desc locks as a single lock-class:
  */
 static struct lock_class_key irq_desc_lock_class;
 
+#ifdef __STOPWATCH_USE__
+int stopwatch_hardirq_show(struct seq_file *f, void *v)
+{
+	struct irqaction *ap;
+	int irq = *((loff_t *) v);
+	struct irq_desc *desc = irq_to_desc(irq);
+	int cpu;
+
+	if (irq == 0)
+		seq_printf(f, "%20s\tCPU\tmin(us)\tavg(us)\tmax(us)\n\n", "");
+
+	if (irq == (NR_IRQS + 1))
+		seq_printf(f, "%-20s", "softirq");
+	else {
+		ap = desc->action;
+		if (!ap || (desc->handle_irq == handle_bad_irq))
+			return 0;
+		else
+			seq_printf(f, "%3d:%-17s", irq, ap->name);
+	}
+
+	for_each_cpu(cpu, cpu_online_mask) {
+		if (!cpu)
+			seq_printf(f, "\t%d", cpu);
+		else
+			seq_printf(f, "%20s\t%d", "", cpu);
+		stopwatch_show(&STOPWATCH_INSTANCE_CPU(hardirq[irq], cpu), f, STOPWATCH_MICRO);
+		seq_printf(f, "\n");
+	}
+	seq_printf(f, "\n");
+	return 0;
+}
+
+static int __init hardirq_stopwatch_init(void)
+{
+	INIT_STOPWATCH_ARRAY(hardirq, NR_IRQS + 2);
+	return stopwatch_register("hardirq", NR_IRQS + 2, stopwatch_hardirq_show);
+}
+module_init(hardirq_stopwatch_init)
+#endif
+
 #if defined(CONFIG_SMP)
 static void __init init_irq_default_affinity(void)
 {
@@ -384,10 +432,24 @@
 		ack_bad_irq(irq);
 		ret = -EINVAL;
 	} else {
+#ifndef __STOPWATCH_USE__
 		generic_handle_irq(irq);
+#else
+		if (irq > NR_IRQS) {
+			STOPWATCH_START(hardirq[NR_IRQS]);
+			generic_handle_irq(irq);
+			STOPWATCH_STOP(hardirq[NR_IRQS]);
+		} else {
+			STOPWATCH_START(hardirq[irq]);
+			generic_handle_irq(irq);
+			STOPWATCH_STOP(hardirq[irq]);
+		}
+#endif
 	}
 
+	STOPWATCH_START(hardirq[NR_IRQS + 1]);
 	irq_exit();
+	STOPWATCH_STOP(hardirq[NR_IRQS + 1]);
 	set_irq_regs(old_regs);
 	return ret;
 }