cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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livepatch-callbacks-busymod.c (1373B)

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