1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/kernel.h>
3 #include <linux/module.h>
4 #include <linux/memory.h>
5
6 #include "notifier-error-inject.h"
7
8 static int priority;
9 module_param(priority, int, 0);
10 MODULE_PARM_DESC(priority, "specify memory notifier priority");
11
12 static struct notifier_err_inject memory_notifier_err_inject = {
13 .actions = {
14 { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_ONLINE) },
15 { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_OFFLINE) },
16 {}
17 }
18 };
19
20 static struct dentry *dir;
21
22 static int err_inject_init(void)
23 {
24 int err;
25
26 dir = notifier_err_inject_init("memory", notifier_err_inject_dir,
27 &memory_notifier_err_inject, priority);
28 if (IS_ERR(dir))
29 return PTR_ERR(dir);
30
31 err = register_memory_notifier(&memory_notifier_err_inject.nb);
32 if (err)
33 debugfs_remove_recursive(dir);
34
35 return err;
36 }
37
38 static void err_inject_exit(void)
39 {
40 unregister_memory_notifier(&memory_notifier_err_inject.nb);
41 debugfs_remove_recursive(dir);
42 }
43
44 module_init(err_inject_init);
45 module_exit(err_inject_exit);
46
47 MODULE_DESCRIPTION("memory notifier error injection module");
48 MODULE_LICENSE("GPL");
49 MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
50
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