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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (C) 2017 Joe Lawrence <joe.lawrence@redhat.com> */
/* * livepatch-callbacks-busymod.c - (un)patching callbacks demo support module * * * Purpose * ------- * * Simple module to demonstrate livepatch (un)patching callbacks. * * * Usage * ----- * * This module is not intended to be standalone. See the "Usage" * section of livepatch-callbacks-mod.c. */
#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 livepatch_callbacks_mod_init(void){ pr_info("%s\n", __func__); schedule_delayed_work(&work, 0); return 0;}
static void livepatch_callbacks_mod_exit(void){ cancel_delayed_work_sync(&work); pr_info("%s\n", __func__);}
module_init(livepatch_callbacks_mod_init);module_exit(livepatch_callbacks_mod_exit);MODULE_DESCRIPTION("Live patching demo for (un)patching callbacks, support module");MODULE_LICENSE("GPL");