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-rw-r--r--lib/test_static_keys.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/lib/test_static_keys.c b/lib/test_static_keys.c
new file mode 100644
index 000000000000..c61b299e367f
--- /dev/null
+++ b/lib/test_static_keys.c
@@ -0,0 +1,225 @@
+/*
+ * 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) \
+ ({bool func(void) { return branch(key); } func; })
+
+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;
+}
+
+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 = test_key_func(&old_true_key, static_key_true),
+ },
+ {
+ .init_state = false,
+ .key = &old_false_key,
+ .test_key = test_key_func(&old_false_key, static_key_false),
+ },
+ /* internal keys - new keys */
+ {
+ .init_state = true,
+ .key = &true_key.key,
+ .test_key = test_key_func(&true_key, static_branch_likely),
+ },
+ {
+ .init_state = true,
+ .key = &true_key.key,
+ .test_key = test_key_func(&true_key, static_branch_unlikely),
+ },
+ {
+ .init_state = false,
+ .key = &false_key.key,
+ .test_key = test_key_func(&false_key, static_branch_likely),
+ },
+ {
+ .init_state = false,
+ .key = &false_key.key,
+ .test_key = test_key_func(&false_key, static_branch_unlikely),
+ },
+ /* external keys - old keys */
+ {
+ .init_state = true,
+ .key = &base_old_true_key,
+ .test_key = test_key_func(&base_old_true_key, static_key_true),
+ },
+ {
+ .init_state = false,
+ .key = &base_inv_old_true_key,
+ .test_key = test_key_func(&base_inv_old_true_key, static_key_true),
+ },
+ {
+ .init_state = false,
+ .key = &base_old_false_key,
+ .test_key = test_key_func(&base_old_false_key, static_key_false),
+ },
+ {
+ .init_state = true,
+ .key = &base_inv_old_false_key,
+ .test_key = test_key_func(&base_inv_old_false_key, static_key_false),
+ },
+ /* external keys - new keys */
+ {
+ .init_state = true,
+ .key = &base_true_key.key,
+ .test_key = test_key_func(&base_true_key, static_branch_likely),
+ },
+ {
+ .init_state = true,
+ .key = &base_true_key.key,
+ .test_key = test_key_func(&base_true_key, static_branch_unlikely),
+ },
+ {
+ .init_state = false,
+ .key = &base_inv_true_key.key,
+ .test_key = test_key_func(&base_inv_true_key, static_branch_likely),
+ },
+ {
+ .init_state = false,
+ .key = &base_inv_true_key.key,
+ .test_key = test_key_func(&base_inv_true_key, static_branch_unlikely),
+ },
+ {
+ .init_state = false,
+ .key = &base_false_key.key,
+ .test_key = test_key_func(&base_false_key, static_branch_likely),
+ },
+ {
+ .init_state = false,
+ .key = &base_false_key.key,
+ .test_key = test_key_func(&base_false_key, static_branch_unlikely),
+ },
+ {
+ .init_state = true,
+ .key = &base_inv_false_key.key,
+ .test_key = test_key_func(&base_inv_false_key, static_branch_likely),
+ },
+ {
+ .init_state = true,
+ .key = &base_inv_false_key.key,
+ .test_key = test_key_func(&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");

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