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Linux/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");
 69 

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