Root/lib/memory-notifier-error-inject.c

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

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