lib/test_static_key_base.c

   1 /*
   2  * Kernel module for testing static keys.
   3  *
   4  * Copyright 2015 Akamai Technologies Inc. All Rights Reserved
   5  *
   6  * Authors:
   7  *      Jason Baron       <jbaron@akamai.com>
   8  *
   9  * This software is licensed under the terms of the GNU General Public
  10  * License version 2, as published by the Free Software Foundation, and
  11  * may be copied, distributed, and modified under those terms.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/jump_label.h>
  21
  22 /* old keys */
  23 struct static_key base_old_true_key = STATIC_KEY_INIT_TRUE;
  24 EXPORT_SYMBOL_GPL(base_old_true_key);
  25 struct static_key base_inv_old_true_key = STATIC_KEY_INIT_TRUE;
  26 EXPORT_SYMBOL_GPL(base_inv_old_true_key);
  27 struct static_key base_old_false_key = STATIC_KEY_INIT_FALSE;
  28 EXPORT_SYMBOL_GPL(base_old_false_key);
  29 struct static_key base_inv_old_false_key = STATIC_KEY_INIT_FALSE;
  30 EXPORT_SYMBOL_GPL(base_inv_old_false_key);
  31
  32 /* new keys */
  33 DEFINE_STATIC_KEY_TRUE(base_true_key);
  34 EXPORT_SYMBOL_GPL(base_true_key);
  35 DEFINE_STATIC_KEY_TRUE(base_inv_true_key);
  36 EXPORT_SYMBOL_GPL(base_inv_true_key);
  37 DEFINE_STATIC_KEY_FALSE(base_false_key);
  38 EXPORT_SYMBOL_GPL(base_false_key);
  39 DEFINE_STATIC_KEY_FALSE(base_inv_false_key);
  40 EXPORT_SYMBOL_GPL(base_inv_false_key);
  41
  42 static void invert_key(struct static_key *key)
  43 {
  44         if (static_key_enabled(key))
  45                 static_key_disable(key);
  46         else
  47                 static_key_enable(key);
  48 }
  49
  50 static int __init test_static_key_base_init(void)
  51 {
  52         invert_key(&base_inv_old_true_key);
  53         invert_key(&base_inv_old_false_key);
  54         invert_key(&base_inv_true_key.key);
  55         invert_key(&base_inv_false_key.key);
  56
  57         return 0;
  58 }
  59
  60 static void __exit test_static_key_base_exit(void)
  61 {
  62 }
  63
  64 module_init(test_static_key_base_init);
  65 module_exit(test_static_key_base_exit);
  66
  67 MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
  68 MODULE_LICENSE("GPL");