LXR linux/lib/memory-notifier-error-inject.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2#include <linux/kernel.h>
   3#include <linux/module.h>
   4#include <linux/memory.h>
   5
   6#include "notifier-error-inject.h"
   7
   8static int priority;
   9module_param(priority, int, 0);
  10MODULE_PARM_DESC(priority, "specify memory notifier priority");
  11
  12static struct notifier_err_inject memory_notifier_err_inject = {
  13        .actions = {
  14                { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_ONLINE) },
  15                { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_OFFLINE) },
  16                {}
  17        }
  18};
  19
  20static struct dentry *dir;
  21
  22static int err_inject_init(void)
  23{
  24        int err;
  25
  26        dir = notifier_err_inject_init("memory", notifier_err_inject_dir,
  27                                        &memory_notifier_err_inject, priority);
  28        if (IS_ERR(dir))
  29                return PTR_ERR(dir);
  30
  31        err = register_memory_notifier(&memory_notifier_err_inject.nb);
  32        if (err)
  33                debugfs_remove_recursive(dir);
  34
  35        return err;
  36}
  37
  38static void err_inject_exit(void)
  39{
  40        unregister_memory_notifier(&memory_notifier_err_inject.nb);
  41        debugfs_remove_recursive(dir);
  42}
  43
  44module_init(err_inject_init);
  45module_exit(err_inject_exit);
  46
  47MODULE_DESCRIPTION("memory notifier error injection module");
  48MODULE_LICENSE("GPL");
  49MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
  50