61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2017 Joe Lawrence <joe.lawrence@redhat.com>
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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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