// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/kernel.h> #include <linux/workqueue.h> #include <linux/delay.h> static int sleep_secs; module_param(sleep_secs, int, 0644); MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)"); static void busymod_work_func(struct work_struct *work); static DECLARE_DELAYED_WORK(work, busymod_work_func); static void busymod_work_func(struct work_struct *work) { pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs); msleep(sleep_secs * 1000); pr_info("%s exit\n", __func__); } static int test_klp_callbacks_busy_init(void) { pr_info("%s\n", __func__); schedule_delayed_work(&work, msecs_to_jiffies(1000 * 0)); return 0; } static void test_klp_callbacks_busy_exit(void) { cancel_delayed_work_sync(&work); pr_info("%s\n", __func__); } module_init(test_klp_callbacks_busy_init); module_exit(test_klp_callbacks_busy_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>"); MODULE_DESCRIPTION("Livepatch test: busy target module"); |