linux-stable/lib/test_static_keys.c
Thomas Gleixner 9c92ab6191 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282
Based on 1 normalized pattern(s):

  this software is licensed under the terms of the gnu general public
  license version 2 as published by the free software foundation and
  may be copied distributed and modified under those terms this
  program is distributed in the hope that it will be useful but
  without any warranty without even the implied warranty of
  merchantability or fitness for a particular purpose see the gnu
  general public license for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 285 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141900.642774971@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:37 +02:00

239 lines
5.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Kernel module for testing static keys.
*
* Copyright 2015 Akamai Technologies Inc. All Rights Reserved
*
* Authors:
* Jason Baron <jbaron@akamai.com>
*/
#include <linux/module.h>
#include <linux/jump_label.h>
/* old keys */
struct static_key old_true_key = STATIC_KEY_INIT_TRUE;
struct static_key old_false_key = STATIC_KEY_INIT_FALSE;
/* new api */
DEFINE_STATIC_KEY_TRUE(true_key);
DEFINE_STATIC_KEY_FALSE(false_key);
/* external */
extern struct static_key base_old_true_key;
extern struct static_key base_inv_old_true_key;
extern struct static_key base_old_false_key;
extern struct static_key base_inv_old_false_key;
/* new api */
extern struct static_key_true base_true_key;
extern struct static_key_true base_inv_true_key;
extern struct static_key_false base_false_key;
extern struct static_key_false base_inv_false_key;
struct test_key {
bool init_state;
struct static_key *key;
bool (*test_key)(void);
};
#define test_key_func(key, branch) \
static bool key ## _ ## branch(void) \
{ \
return branch(&key); \
}
static void invert_key(struct static_key *key)
{
if (static_key_enabled(key))
static_key_disable(key);
else
static_key_enable(key);
}
static void invert_keys(struct test_key *keys, int size)
{
struct static_key *previous = NULL;
int i;
for (i = 0; i < size; i++) {
if (previous != keys[i].key) {
invert_key(keys[i].key);
previous = keys[i].key;
}
}
}
static int verify_keys(struct test_key *keys, int size, bool invert)
{
int i;
bool ret, init;
for (i = 0; i < size; i++) {
ret = static_key_enabled(keys[i].key);
init = keys[i].init_state;
if (ret != (invert ? !init : init))
return -EINVAL;
ret = keys[i].test_key();
if (static_key_enabled(keys[i].key)) {
if (!ret)
return -EINVAL;
} else {
if (ret)
return -EINVAL;
}
}
return 0;
}
test_key_func(old_true_key, static_key_true)
test_key_func(old_false_key, static_key_false)
test_key_func(true_key, static_branch_likely)
test_key_func(true_key, static_branch_unlikely)
test_key_func(false_key, static_branch_likely)
test_key_func(false_key, static_branch_unlikely)
test_key_func(base_old_true_key, static_key_true)
test_key_func(base_inv_old_true_key, static_key_true)
test_key_func(base_old_false_key, static_key_false)
test_key_func(base_inv_old_false_key, static_key_false)
test_key_func(base_true_key, static_branch_likely)
test_key_func(base_true_key, static_branch_unlikely)
test_key_func(base_inv_true_key, static_branch_likely)
test_key_func(base_inv_true_key, static_branch_unlikely)
test_key_func(base_false_key, static_branch_likely)
test_key_func(base_false_key, static_branch_unlikely)
test_key_func(base_inv_false_key, static_branch_likely)
test_key_func(base_inv_false_key, static_branch_unlikely)
static int __init test_static_key_init(void)
{
int ret;
int size;
struct test_key static_key_tests[] = {
/* internal keys - old keys */
{
.init_state = true,
.key = &old_true_key,
.test_key = &old_true_key_static_key_true,
},
{
.init_state = false,
.key = &old_false_key,
.test_key = &old_false_key_static_key_false,
},
/* internal keys - new keys */
{
.init_state = true,
.key = &true_key.key,
.test_key = &true_key_static_branch_likely,
},
{
.init_state = true,
.key = &true_key.key,
.test_key = &true_key_static_branch_unlikely,
},
{
.init_state = false,
.key = &false_key.key,
.test_key = &false_key_static_branch_likely,
},
{
.init_state = false,
.key = &false_key.key,
.test_key = &false_key_static_branch_unlikely,
},
/* external keys - old keys */
{
.init_state = true,
.key = &base_old_true_key,
.test_key = &base_old_true_key_static_key_true,
},
{
.init_state = false,
.key = &base_inv_old_true_key,
.test_key = &base_inv_old_true_key_static_key_true,
},
{
.init_state = false,
.key = &base_old_false_key,
.test_key = &base_old_false_key_static_key_false,
},
{
.init_state = true,
.key = &base_inv_old_false_key,
.test_key = &base_inv_old_false_key_static_key_false,
},
/* external keys - new keys */
{
.init_state = true,
.key = &base_true_key.key,
.test_key = &base_true_key_static_branch_likely,
},
{
.init_state = true,
.key = &base_true_key.key,
.test_key = &base_true_key_static_branch_unlikely,
},
{
.init_state = false,
.key = &base_inv_true_key.key,
.test_key = &base_inv_true_key_static_branch_likely,
},
{
.init_state = false,
.key = &base_inv_true_key.key,
.test_key = &base_inv_true_key_static_branch_unlikely,
},
{
.init_state = false,
.key = &base_false_key.key,
.test_key = &base_false_key_static_branch_likely,
},
{
.init_state = false,
.key = &base_false_key.key,
.test_key = &base_false_key_static_branch_unlikely,
},
{
.init_state = true,
.key = &base_inv_false_key.key,
.test_key = &base_inv_false_key_static_branch_likely,
},
{
.init_state = true,
.key = &base_inv_false_key.key,
.test_key = &base_inv_false_key_static_branch_unlikely,
},
};
size = ARRAY_SIZE(static_key_tests);
ret = verify_keys(static_key_tests, size, false);
if (ret)
goto out;
invert_keys(static_key_tests, size);
ret = verify_keys(static_key_tests, size, true);
if (ret)
goto out;
invert_keys(static_key_tests, size);
ret = verify_keys(static_key_tests, size, false);
if (ret)
goto out;
return 0;
out:
return ret;
}
static void __exit test_static_key_exit(void)
{
}
module_init(test_static_key_init);
module_exit(test_static_key_exit);
MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
MODULE_LICENSE("GPL");