projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 93862e38 JL |
1 | /* |
| 2 | * Copyright (C) 2017 Joe Lawrence <joe.lawrence@redhat.com> | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or | |
| 5 | * modify it under the terms of the GNU General Public License | |
| 6 | * as published by the Free Software Foundation; either version 2 | |
| 7 | * of the License, or (at your option) any later version. | |
| 8 | * | |
| 9 | * This program is distributed in the hope that it will be useful, | |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 | * GNU General Public License for more details. | |
| 13 | * | |
| 14 | * You should have received a copy of the GNU General Public License | |
| 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
| 16 | */ | |
| 17 | ||
| 18 | /* | |
| 19 | * livepatch-callbacks-busymod.c - (un)patching callbacks demo support module | |
| 20 | * | |
| 21 | * | |
| 22 | * Purpose | |
| 23 | * ------- | |
| 24 | * | |
| 25 | * Simple module to demonstrate livepatch (un)patching callbacks. | |
| 26 | * | |
| 27 | * | |
| 28 | * Usage | |
| 29 | * ----- | |
| 30 | * | |
| 31 | * This module is not intended to be standalone. See the "Usage" | |
| 32 | * section of livepatch-callbacks-mod.c. | |
| 33 | */ | |
| 34 | ||
| 35 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
| 36 | ||
| 37 | #include <linux/module.h> | |
| 38 | #include <linux/kernel.h> | |
| 39 | #include <linux/workqueue.h> | |
| 40 | #include <linux/delay.h> | |
| 41 | ||
| 42 | static int sleep_secs; | |
| 43 | module_param(sleep_secs, int, 0644); | |
| 44 | MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)"); | |
| 45 | ||
| 46 | static void busymod_work_func(struct work_struct *work); | |
| 47 | static DECLARE_DELAYED_WORK(work, busymod_work_func); | |
| 48 | ||
| 49 | static void busymod_work_func(struct work_struct *work) | |
| 50 | { | |
| 51 | pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs); | |
| 52 | msleep(sleep_secs * 1000); | |
| 53 | pr_info("%s exit\n", __func__); | |
| 54 | } | |
| 55 | ||
| 56 | static int livepatch_callbacks_mod_init(void) | |
| 57 | { | |
| 58 | pr_info("%s\n", __func__); | |
| 59 | schedule_delayed_work(&work, | |
| 60 | msecs_to_jiffies(1000 * 0)); | |
| 61 | return 0; | |
| 62 | } | |
| 63 | ||
| 64 | static void livepatch_callbacks_mod_exit(void) | |
| 65 | { | |
| 66 | cancel_delayed_work_sync(&work); | |
| 67 | pr_info("%s\n", __func__); | |
| 68 | } | |
| 69 | ||
| 70 | module_init(livepatch_callbacks_mod_init); | |
| 71 | module_exit(livepatch_callbacks_mod_exit); | |
| 72 | MODULE_LICENSE("GPL"); |