the-tree/lib/memory-notifier-error-inject.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 #include <linux/kernel.h>
0003 #include <linux/module.h>
0004 #include <linux/memory.h>
0005
0006 #include "notifier-error-inject.h"
0007
0008 static int priority;
0009 module_param(priority, int, 0);
0010 MODULE_PARM_DESC(priority, "specify memory notifier priority");
0011
0012 static struct notifier_err_inject memory_notifier_err_inject = {
0013     .actions = {
0014         { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_ONLINE) },
0015         { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_OFFLINE) },
0016         {}
0017     }
0018 };
0019
0020 static struct dentry *dir;
0021
0022 static int err_inject_init(void)
0023 {
0024     int err;
0025
0026     dir = notifier_err_inject_init("memory", notifier_err_inject_dir,
0027                     &memory_notifier_err_inject, priority);
0028     if (IS_ERR(dir))
0029         return PTR_ERR(dir);
0030
0031     err = register_memory_notifier(&memory_notifier_err_inject.nb);
0032     if (err)
0033         debugfs_remove_recursive(dir);
0034
0035     return err;
0036 }
0037
0038 static void err_inject_exit(void)
0039 {
0040     unregister_memory_notifier(&memory_notifier_err_inject.nb);
0041     debugfs_remove_recursive(dir);
0042 }
0043
0044 module_init(err_inject_init);
0045 module_exit(err_inject_exit);
0046
0047 MODULE_DESCRIPTION("memory notifier error injection module");
0048 MODULE_LICENSE("GPL");
0049 MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");