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