Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2017 Joe Lawrence <joe.lawrence@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * livepatch-callbacks-busymod.c - (un)patching callbacks demo support module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * Purpose
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * -------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * Simple module to demonstrate livepatch (un)patching callbacks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * Usage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * -----
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * This module is not intended to be standalone.  See the "Usage"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * section of livepatch-callbacks-mod.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static int sleep_secs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) module_param(sleep_secs, int, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static void busymod_work_func(struct work_struct *work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static DECLARE_DELAYED_WORK(work, busymod_work_func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static void busymod_work_func(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	msleep(sleep_secs * 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	pr_info("%s exit\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static int livepatch_callbacks_mod_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	pr_info("%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	schedule_delayed_work(&work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		msecs_to_jiffies(1000 * 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static void livepatch_callbacks_mod_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	cancel_delayed_work_sync(&work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	pr_info("%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) module_init(livepatch_callbacks_mod_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) module_exit(livepatch_callbacks_mod_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) MODULE_LICENSE("GPL");