1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2017 Joe Lawrence <joe.lawrence@redhat.com> |
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(msecs: 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(dwork: &work, |
48 | delay: msecs_to_jiffies(m: 1000 * 0)); |
49 | return 0; |
50 | } |
51 | |
52 | static void livepatch_callbacks_mod_exit(void) |
53 | { |
54 | cancel_delayed_work_sync(dwork: &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" ); |
61 | |