root/lib/test_static_key_base.c

DEFINITIONS

1. invert_key
2. test_static_key_base_init
3. test_static_key_base_exit

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Kernel module for testing static keys.
   4  *
   5  * Copyright 2015 Akamai Technologies Inc. All Rights Reserved
   6  *
   7  * Authors:
   8  *      Jason Baron       <jbaron@akamai.com>
   9  */
  10 
  11 #include <linux/module.h>
  12 #include <linux/jump_label.h>
  13 
  14 /* old keys */
  15 struct static_key base_old_true_key = STATIC_KEY_INIT_TRUE;
  16 EXPORT_SYMBOL_GPL(base_old_true_key);
  17 struct static_key base_inv_old_true_key = STATIC_KEY_INIT_TRUE;
  18 EXPORT_SYMBOL_GPL(base_inv_old_true_key);
  19 struct static_key base_old_false_key = STATIC_KEY_INIT_FALSE;
  20 EXPORT_SYMBOL_GPL(base_old_false_key);
  21 struct static_key base_inv_old_false_key = STATIC_KEY_INIT_FALSE;
  22 EXPORT_SYMBOL_GPL(base_inv_old_false_key);
  23 
  24 /* new keys */
  25 DEFINE_STATIC_KEY_TRUE(base_true_key);
  26 EXPORT_SYMBOL_GPL(base_true_key);
  27 DEFINE_STATIC_KEY_TRUE(base_inv_true_key);
  28 EXPORT_SYMBOL_GPL(base_inv_true_key);
  29 DEFINE_STATIC_KEY_FALSE(base_false_key);
  30 EXPORT_SYMBOL_GPL(base_false_key);
  31 DEFINE_STATIC_KEY_FALSE(base_inv_false_key);
  32 EXPORT_SYMBOL_GPL(base_inv_false_key);
  33 
  34 static void invert_key(struct static_key *key)
  35 {
  36         if (static_key_enabled(key))
  37                 static_key_disable(key);
  38         else
  39                 static_key_enable(key);
  40 }
  41 
  42 static int __init test_static_key_base_init(void)
  43 {
  44         invert_key(&base_inv_old_true_key);
  45         invert_key(&base_inv_old_false_key);
  46         invert_key(&base_inv_true_key.key);
  47         invert_key(&base_inv_false_key.key);
  48 
  49         return 0;
  50 }
  51 
  52 static void __exit test_static_key_base_exit(void)
  53 {
  54 }
  55 
  56 module_init(test_static_key_base_init);
  57 module_exit(test_static_key_base_exit);
  58 
  59 MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
  60 MODULE_LICENSE("GPL");