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
   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>");