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60 lines
1.3 KiB
60 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2017 Joe Lawrence <[email protected]> |
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*/ |
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/* |
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* livepatch-callbacks-busymod.c - (un)patching callbacks demo support module |
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* |
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* |
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* Purpose |
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* ------- |
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* |
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* Simple module to demonstrate livepatch (un)patching callbacks. |
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* |
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* |
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* Usage |
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* ----- |
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* |
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* This module is not intended to be standalone. See the "Usage" |
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* section of livepatch-callbacks-mod.c. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/workqueue.h> |
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#include <linux/delay.h> |
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static int sleep_secs; |
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module_param(sleep_secs, int, 0644); |
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MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)"); |
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static void busymod_work_func(struct work_struct *work); |
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static DECLARE_DELAYED_WORK(work, busymod_work_func); |
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static void busymod_work_func(struct work_struct *work) |
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{ |
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pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs); |
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msleep(sleep_secs * 1000); |
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pr_info("%s exit\n", __func__); |
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} |
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static int livepatch_callbacks_mod_init(void) |
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{ |
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pr_info("%s\n", __func__); |
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schedule_delayed_work(&work, |
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msecs_to_jiffies(1000 * 0)); |
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return 0; |
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} |
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static void livepatch_callbacks_mod_exit(void) |
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{ |
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cancel_delayed_work_sync(&work); |
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pr_info("%s\n", __func__); |
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} |
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module_init(livepatch_callbacks_mod_init); |
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module_exit(livepatch_callbacks_mod_exit); |
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MODULE_LICENSE("GPL");
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