| 1 | #include <linux/kernel.h> |
| 2 | #include <linux/module.h> |
| 3 | #include <linux/cpu.h> |
| 4 | |
| 5 | #include "notifier-error-inject.h" |
| 6 | |
| 7 | static int priority; |
| 8 | module_param(priority, int, 0); |
| 9 | MODULE_PARM_DESC(priority, "specify cpu notifier priority"); |
| 10 | |
| 11 | static 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 | |
| 21 | static struct dentry *dir; |
| 22 | |
| 23 | static 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 | |
| 39 | static void err_inject_exit(void) |
| 40 | { |
| 41 | unregister_hotcpu_notifier(&cpu_notifier_err_inject.nb); |
| 42 | debugfs_remove_recursive(dir); |
| 43 | } |
| 44 | |
| 45 | module_init(err_inject_init); |
| 46 | module_exit(err_inject_exit); |
| 47 | |
| 48 | MODULE_DESCRIPTION("CPU notifier error injection module"); |
| 49 | MODULE_LICENSE("GPL"); |
| 50 | MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>"); |