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