Actually install modules to root manually, irq failed attempt

kernel_module/irq.c

@@ -0,0 +1,42 @@
+/*
+TODO: get handler running multiple times on some existing interrupt from /proc/interrupts.
+*/
+
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+MODULE_LICENSE("GPL");
+
+/**
+ * Return value from kernel docs:*
+ *
+ * enum irqreturn
+ * @IRQ_NON         interrupt was not from this device or was not handled
+ * @IRQ_HANDLED     interrupt was handled by this device
+ * @IRQ_WAKE_THREAD handler requests to wake the handler thread
+ */
+static irqreturn_t handler(int i, void *v)
+{
+	pr_info("handler %llu\n", (unsigned long long)jiffies);
+	return IRQ_HANDLED;
+}
+
+int init_module(void)
+{
+	irqreturn_t r;
+	r = request_irq(
+		1,
+		handler,
+		IRQF_SHARED,
+		"myirqhandler0",
+		0
+	);
+	pr_info("request_irq %llu\n", (unsigned long long)r);
+	return 0;
+}
+
+void cleanup_module(void)
+{
+}