Actually install modules to root manually, irq failed attempt

kernel_module/module_init.c

@@ -0,0 +1,26 @@
+/*
+Hello world with module_init / exit macros.
+
+TODO: vs direct init_module and cleanup_module.
+
+- modprobe only works with the macros. Try "modprobe module_init".
+*/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+MODULE_LICENSE("GPL");
+
+static int module_init_init(void)
+{
+	pr_info("module_init init\n");
+	return 0;
+}
+
+static void module_init_exit(void)
+{
+	pr_info("module_exit cleanup\n");
+}
+
+module_init(module_init_init)
+module_exit(module_init_exit)