lib/memory-notifier-error-inject.c

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