| 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 | |
| 8 | static int priority; |
| 9 | module_param(priority, int, 0); |
| 10 | MODULE_PARM_DESC(priority, "specify memory notifier priority"); |
| 11 | |
| 12 | static 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 | |
| 20 | static struct dentry *dir; |
| 21 | |
| 22 | static int err_inject_init(void) |
| 23 | { |
| 24 | int err; |
| 25 | |
| 26 | dir = notifier_err_inject_init(name: "memory", parent: notifier_err_inject_dir, |
| 27 | err_inject: &memory_notifier_err_inject, priority); |
| 28 | if (IS_ERR(ptr: dir)) |
| 29 | return PTR_ERR(ptr: dir); |
| 30 | |
| 31 | err = register_memory_notifier(nb: &memory_notifier_err_inject.nb); |
| 32 | if (err) |
| 33 | debugfs_remove_recursive(dentry: dir); |
| 34 | |
| 35 | return err; |
| 36 | } |
| 37 | |
| 38 | static void err_inject_exit(void) |
| 39 | { |
| 40 | unregister_memory_notifier(nb: &memory_notifier_err_inject.nb); |
| 41 | debugfs_remove_recursive(dentry: dir); |
| 42 | } |
| 43 | |
| 44 | module_init(err_inject_init); |
| 45 | module_exit(err_inject_exit); |
| 46 | |
| 47 | MODULE_DESCRIPTION("memory notifier error injection module"); |
| 48 | MODULE_LICENSE("GPL"); |
| 49 | MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>"); |
| 50 |