]>
Commit | Line | Data |
---|---|---|
1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
93862e38 JL |
2 | /* |
3 | * Copyright (C) 2017 Joe Lawrence <joe.lawrence@redhat.com> | |
93862e38 JL |
4 | */ |
5 | ||
6 | /* | |
7 | * livepatch-callbacks-busymod.c - (un)patching callbacks demo support module | |
8 | * | |
9 | * | |
10 | * Purpose | |
11 | * ------- | |
12 | * | |
13 | * Simple module to demonstrate livepatch (un)patching callbacks. | |
14 | * | |
15 | * | |
16 | * Usage | |
17 | * ----- | |
18 | * | |
19 | * This module is not intended to be standalone. See the "Usage" | |
20 | * section of livepatch-callbacks-mod.c. | |
21 | */ | |
22 | ||
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/workqueue.h> | |
28 | #include <linux/delay.h> | |
29 | ||
30 | static int sleep_secs; | |
31 | module_param(sleep_secs, int, 0644); | |
32 | MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)"); | |
33 | ||
34 | static void busymod_work_func(struct work_struct *work); | |
35 | static DECLARE_DELAYED_WORK(work, busymod_work_func); | |
36 | ||
37 | static void busymod_work_func(struct work_struct *work) | |
38 | { | |
39 | pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs); | |
40 | msleep(sleep_secs * 1000); | |
41 | pr_info("%s exit\n", __func__); | |
42 | } | |
43 | ||
44 | static int livepatch_callbacks_mod_init(void) | |
45 | { | |
46 | pr_info("%s\n", __func__); | |
47 | schedule_delayed_work(&work, | |
48 | msecs_to_jiffies(1000 * 0)); | |
49 | return 0; | |
50 | } | |
51 | ||
52 | static void livepatch_callbacks_mod_exit(void) | |
53 | { | |
54 | cancel_delayed_work_sync(&work); | |
55 | pr_info("%s\n", __func__); | |
56 | } | |
57 | ||
58 | module_init(livepatch_callbacks_mod_init); | |
59 | module_exit(livepatch_callbacks_mod_exit); | |
60 | MODULE_LICENSE("GPL"); |