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

1#include <linux/kernel.h>
2#include <linux/module.h>
3#include <linux/cpu.h>
4
5#include "notifier-error-inject.h"
6
7static int priority;
8module_param(priority, int, 0);
9MODULE_PARM_DESC(priority, "specify cpu notifier priority");
10
11static struct notifier_err_inject cpu_notifier_err_inject = {
12    .actions = {
13        { NOTIFIER_ERR_INJECT_ACTION(CPU_UP_PREPARE) },
14        { NOTIFIER_ERR_INJECT_ACTION(CPU_UP_PREPARE_FROZEN) },
15        { NOTIFIER_ERR_INJECT_ACTION(CPU_DOWN_PREPARE) },
16        { NOTIFIER_ERR_INJECT_ACTION(CPU_DOWN_PREPARE_FROZEN) },
17        {}
18    }
19};
20
21static struct dentry *dir;
22
23static int err_inject_init(void)
24{
25    int err;
26
27    dir = notifier_err_inject_init("cpu", notifier_err_inject_dir,
28                    &cpu_notifier_err_inject, priority);
29    if (IS_ERR(dir))
30        return PTR_ERR(dir);
31
32    err = register_hotcpu_notifier(&cpu_notifier_err_inject.nb);
33    if (err)
34        debugfs_remove_recursive(dir);
35
36    return err;
37}
38
39static void err_inject_exit(void)
40{
41    unregister_hotcpu_notifier(&cpu_notifier_err_inject.nb);
42    debugfs_remove_recursive(dir);
43}
44
45module_init(err_inject_init);
46module_exit(err_inject_exit);
47
48MODULE_DESCRIPTION("CPU notifier error injection module");
49MODULE_LICENSE("GPL");
50MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
51

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