Eric Lee / smarc-fsl-linux-kernel

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samples/livepatch/livepatch-callbacks-busymod.c 1.34 KB
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1ccea77e2   Thomas Gleixner   treewide: Replace... 
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  // SPDX-License-Identifier: GPL-2.0-or-later
93862e385   Joe Lawrence   livepatch: add (u... 
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  /*
   * Copyright (C) 2017 Joe Lawrence <joe.lawrence@redhat.com>
93862e385   Joe Lawrence   livepatch: add (u... 
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   */
  
  /*
   * livepatch-callbacks-busymod.c - (un)patching callbacks demo support module
   *
   *
   * Purpose
   * -------
   *
   * Simple module to demonstrate livepatch (un)patching callbacks.
   *
   *
   * Usage
   * -----
   *
   * This module is not intended to be standalone.  See the "Usage"
   * section of livepatch-callbacks-mod.c.
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/workqueue.h>
  #include <linux/delay.h>
  
  static int sleep_secs;
  module_param(sleep_secs, int, 0644);
  MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)");
  
  static void busymod_work_func(struct work_struct *work);
  static DECLARE_DELAYED_WORK(work, busymod_work_func);
  
  static void busymod_work_func(struct work_struct *work)
  {
  	pr_info("%s, sleeping %d seconds ...
  ", __func__, sleep_secs);
  	msleep(sleep_secs * 1000);
  	pr_info("%s exit
  ", __func__);
  }
  
  static int livepatch_callbacks_mod_init(void)
  {
  	pr_info("%s
  ", __func__);
  	schedule_delayed_work(&work,
  		msecs_to_jiffies(1000 * 0));
  	return 0;
  }
  
  static void livepatch_callbacks_mod_exit(void)
  {
  	cancel_delayed_work_sync(&work);
  	pr_info("%s
  ", __func__);
  }
  
  module_init(livepatch_callbacks_mod_init);
  module_exit(livepatch_callbacks_mod_exit);
  MODULE_LICENSE("GPL");