1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com> 3 4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 5 6 #include <linux/module.h> 7 #include <linux/kernel.h> 8 #include <linux/workqueue.h> 9 #include <linux/delay.h> 10 11 static int sleep_secs; 12 module_param(sleep_secs, int, 0644); 13 MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)"); 14 15 static void busymod_work_func(struct work_struct *work); 16 static DECLARE_DELAYED_WORK(work, busymod_work_func); 17 18 static void busymod_work_func(struct work_struct *work) 19 { 20 pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs); 21 msleep(sleep_secs * 1000); 22 pr_info("%s exit\n", __func__); 23 } 24 25 static int test_klp_callbacks_busy_init(void) 26 { 27 pr_info("%s\n", __func__); 28 schedule_delayed_work(&work, 29 msecs_to_jiffies(1000 * 0)); 30 return 0; 31 } 32 33 static void test_klp_callbacks_busy_exit(void) 34 { 35 cancel_delayed_work_sync(&work); 36 pr_info("%s\n", __func__); 37 } 38 39 module_init(test_klp_callbacks_busy_init); 40 module_exit(test_klp_callbacks_busy_exit); 41 MODULE_LICENSE("GPL"); 42 MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>"); 43 MODULE_DESCRIPTION("Livepatch test: busy target module"); 44