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