1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2017 Joe Lawrence <joe.lawrence@redhat.com>
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun /*
7*4882a593Smuzhiyun * livepatch-callbacks-busymod.c - (un)patching callbacks demo support module
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun * Purpose
11*4882a593Smuzhiyun * -------
12*4882a593Smuzhiyun *
13*4882a593Smuzhiyun * Simple module to demonstrate livepatch (un)patching callbacks.
14*4882a593Smuzhiyun *
15*4882a593Smuzhiyun *
16*4882a593Smuzhiyun * Usage
17*4882a593Smuzhiyun * -----
18*4882a593Smuzhiyun *
19*4882a593Smuzhiyun * This module is not intended to be standalone. See the "Usage"
20*4882a593Smuzhiyun * section of livepatch-callbacks-mod.c.
21*4882a593Smuzhiyun */
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun #include <linux/module.h>
26*4882a593Smuzhiyun #include <linux/kernel.h>
27*4882a593Smuzhiyun #include <linux/workqueue.h>
28*4882a593Smuzhiyun #include <linux/delay.h>
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun static int sleep_secs;
31*4882a593Smuzhiyun module_param(sleep_secs, int, 0644);
32*4882a593Smuzhiyun MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)");
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun static void busymod_work_func(struct work_struct *work);
35*4882a593Smuzhiyun static DECLARE_DELAYED_WORK(work, busymod_work_func);
36*4882a593Smuzhiyun
busymod_work_func(struct work_struct * work)37*4882a593Smuzhiyun static void busymod_work_func(struct work_struct *work)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs);
40*4882a593Smuzhiyun msleep(sleep_secs * 1000);
41*4882a593Smuzhiyun pr_info("%s exit\n", __func__);
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
livepatch_callbacks_mod_init(void)44*4882a593Smuzhiyun static int livepatch_callbacks_mod_init(void)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun pr_info("%s\n", __func__);
47*4882a593Smuzhiyun schedule_delayed_work(&work,
48*4882a593Smuzhiyun msecs_to_jiffies(1000 * 0));
49*4882a593Smuzhiyun return 0;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
livepatch_callbacks_mod_exit(void)52*4882a593Smuzhiyun static void livepatch_callbacks_mod_exit(void)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun cancel_delayed_work_sync(&work);
55*4882a593Smuzhiyun pr_info("%s\n", __func__);
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun module_init(livepatch_callbacks_mod_init);
59*4882a593Smuzhiyun module_exit(livepatch_callbacks_mod_exit);
60*4882a593Smuzhiyun MODULE_LICENSE("GPL");
61