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authorJason Baron <jbaron@akamai.com>2015-07-30 06:59:44 +0300
committerIngo Molnar <mingo@kernel.org>2015-08-03 12:51:11 +0300
commit579e1acb153464649781fe5555b4892c0ff84a40 (patch)
treee356583bd738b693e53b02f427672e9967943598 /lib
parented79e946732e5311934d7f404b3b4e702e45cb97 (diff)
downloadlinux-579e1acb153464649781fe5555b4892c0ff84a40.tar.xz
jump_label: Provide a self-test
Signed-off-by: Jason Baron <jbaron@akamai.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: benh@kernel.crashing.org Cc: bp@alien8.de Cc: davem@davemloft.net Cc: ddaney@caviumnetworks.com Cc: heiko.carstens@de.ibm.com Cc: linux-kernel@vger.kernel.org Cc: liuj97@gmail.com Cc: luto@amacapital.net Cc: michael@ellerman.id.au Cc: rabin@rab.in Cc: ralf@linux-mips.org Cc: rostedt@goodmis.org Cc: shuahkh@osg.samsung.com Cc: vbabka@suse.cz Cc: will.deacon@arm.com Link: http://lkml.kernel.org/r/0c091ecebd78a879ed8a71835d205a691a75ab4e.1438227999.git.jbaron@akamai.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug9
-rw-r--r--lib/Makefile2
-rw-r--r--lib/test_jump_label.c225
-rw-r--r--lib/test_jump_label_base.c68
4 files changed, 304 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index e7b5b654ed8d..304e75f832dc 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1841,6 +1841,15 @@ config MEMTEST
memtest=17, mean do 17 test patterns.
If you are unsure how to answer this question, answer N.
+config TEST_JUMP_LABEL
+ tristate "Test jump label"
+ default n
+ depends on m
+ help
+ Test jump labels.
+
+ If unsure, say N.
+
source "samples/Kconfig"
source "lib/Kconfig.kgdb"
diff --git a/lib/Makefile b/lib/Makefile
index 6897b527581a..14f6e07e33a8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -39,6 +39,8 @@ obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
obj-$(CONFIG_TEST_LKM) += test_module.o
obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o
obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
+obj-$(CONFIG_TEST_JUMP_LABEL) += test_jump_label.o
+obj-$(CONFIG_TEST_JUMP_LABEL) += test_jump_label_base.o
ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG
diff --git a/lib/test_jump_label.c b/lib/test_jump_label.c
new file mode 100644
index 000000000000..2fe741329b0e
--- /dev/null
+++ b/lib/test_jump_label.c
@@ -0,0 +1,225 @@
+/*
+ * Kernel module for testing jump labels.
+ *
+ * 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_branch {
+ 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_branch *branches, int size)
+{
+ struct static_key *previous = NULL;
+ int i;
+
+ for (i = 0; i < size; i++) {
+ if (previous != branches[i].key) {
+ invert_key(branches[i].key);
+ previous = branches[i].key;
+ }
+ }
+}
+
+int verify_branches(struct test_branch *branches, int size, bool invert)
+{
+ int i;
+ bool ret, init;
+
+ for (i = 0; i < size; i++) {
+ ret = static_key_enabled(branches[i].key);
+ init = branches[i].init_state;
+ if (ret != (invert ? !init : init))
+ return -EINVAL;
+ ret = branches[i].test_key();
+ if (static_key_enabled(branches[i].key)) {
+ if (!ret)
+ return -EINVAL;
+ } else {
+ if (ret)
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int __init test_jump_label_init(void)
+{
+ int ret;
+ int size;
+
+ struct test_branch jump_label_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(jump_label_tests);
+
+ ret = verify_branches(jump_label_tests, size, false);
+ if (ret)
+ goto out;
+
+ invert_keys(jump_label_tests, size);
+ ret = verify_branches(jump_label_tests, size, true);
+ if (ret)
+ goto out;
+
+ invert_keys(jump_label_tests, size);
+ ret = verify_branches(jump_label_tests, size, false);
+ if (ret)
+ goto out;
+ return 0;
+out:
+ return ret;
+}
+
+static void __exit test_jump_label_exit(void)
+{
+}
+
+module_init(test_jump_label_init);
+module_exit(test_jump_label_exit);
+
+MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
+MODULE_LICENSE("GPL");
diff --git a/lib/test_jump_label_base.c b/lib/test_jump_label_base.c
new file mode 100644
index 000000000000..91aed8e8a7e8
--- /dev/null
+++ b/lib/test_jump_label_base.c
@@ -0,0 +1,68 @@
+/*
+ * Kernel module for testing jump labels.
+ *
+ * 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 base_old_true_key = STATIC_KEY_INIT_TRUE;
+EXPORT_SYMBOL_GPL(base_old_true_key);
+struct static_key base_inv_old_true_key = STATIC_KEY_INIT_TRUE;
+EXPORT_SYMBOL_GPL(base_inv_old_true_key);
+struct static_key base_old_false_key = STATIC_KEY_INIT_FALSE;
+EXPORT_SYMBOL_GPL(base_old_false_key);
+struct static_key base_inv_old_false_key = STATIC_KEY_INIT_FALSE;
+EXPORT_SYMBOL_GPL(base_inv_old_false_key);
+
+/* new keys */
+DEFINE_STATIC_KEY_TRUE(base_true_key);
+EXPORT_SYMBOL_GPL(base_true_key);
+DEFINE_STATIC_KEY_TRUE(base_inv_true_key);
+EXPORT_SYMBOL_GPL(base_inv_true_key);
+DEFINE_STATIC_KEY_FALSE(base_false_key);
+EXPORT_SYMBOL_GPL(base_false_key);
+DEFINE_STATIC_KEY_FALSE(base_inv_false_key);
+EXPORT_SYMBOL_GPL(base_inv_false_key);
+
+static void invert_key(struct static_key *key)
+{
+ if (static_key_enabled(key))
+ static_key_disable(key);
+ else
+ static_key_enable(key);
+}
+
+static int __init test_jump_label_base_init(void)
+{
+ invert_key(&base_inv_old_true_key);
+ invert_key(&base_inv_old_false_key);
+ invert_key(&base_inv_true_key.key);
+ invert_key(&base_inv_false_key.key);
+
+ return 0;
+}
+
+static void __exit test_jump_label_base_exit(void)
+{
+}
+
+module_init(test_jump_label_base_init);
+module_exit(test_jump_label_base_exit);
+
+MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
+MODULE_LICENSE("GPL");