// SPDX-License-Identifier: GPL-2.0-only#include <linux/kernel.h>#include <linux/module.h>#include <linux/memory.h> #include "notifier-error-inject.h" static int priority;module_param(priority, int, 0);MODULE_PARM_DESC(priority, "specify memory notifier priority"); static struct notifier_err_inject memory_notifier_err_inject = {	.actions = {		{ NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_ONLINE) },		{ NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_OFFLINE) },		{}	}}; static struct dentry *dir; static int err_inject_init(void){	int err; 	dir = notifier_err_inject_init("memory", notifier_err_inject_dir,					&memory_notifier_err_inject, priority);	if (IS_ERR(dir))		return PTR_ERR(dir); 	err = register_memory_notifier(&memory_notifier_err_inject.nb);	if (err)		debugfs_remove_recursive(dir); 	return err;} static void err_inject_exit(void){	unregister_memory_notifier(&memory_notifier_err_inject.nb);	debugfs_remove_recursive(dir);} module_init(err_inject_init);module_exit(err_inject_exit); MODULE_DESCRIPTION("memory notifier error injection module");MODULE_LICENSE("GPL");MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");