cregit-Linux how code gets into the kernel

Release 4.13 lib/test_static_keys.c

Directory: lib
/*
 * Kernel module for testing static keys.
 *
 * Copyright 2015 Akamai Technologies Inc. All Rights Reserved
 *
 * Authors:
 *      Jason Baron       <jbaron@akamai.com>
 *
 * 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.
 */

#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); }

Contributors

PersonTokensPropCommitsCommitProp
Jason Baron29100.00%1100.00%
Total29100.00%1100.00%


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; } } }

Contributors

PersonTokensPropCommitsCommitProp
Jason Baron6692.96%150.00%
Ingo Molnar57.04%150.00%
Total71100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Jason Baron11793.60%133.33%
Ingo Molnar75.60%133.33%
Fengguang Wu10.80%133.33%
Total125100.00%3100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Jason Baron44593.68%133.33%
Arnd Bergmann183.79%133.33%
Ingo Molnar122.53%133.33%
Total475100.00%3100.00%


static void __exit test_static_key_exit(void) { }

Contributors

PersonTokensPropCommitsCommitProp
Jason Baron787.50%150.00%
Ingo Molnar112.50%150.00%
Total8100.00%2100.00%

module_init(test_static_key_init); module_exit(test_static_key_exit); MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Jason Baron78483.32%125.00%
Arnd Bergmann12713.50%125.00%
Ingo Molnar293.08%125.00%
Fengguang Wu10.11%125.00%
Total941100.00%4100.00%
Directory: lib
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