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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>
This commit is contained in:
Jason Baron
Ingo Molnar
parent
ed79e94673
commit
579e1acb15
@ -1841,6 +1841,15 @@ config MEMTEST
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memtest=17, mean do 17 test patterns.
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If you are unsure how to answer this question, answer N.
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config TEST_JUMP_LABEL
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tristate "Test jump label"
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default n
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depends on m
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help
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Test jump labels.
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If unsure, say N.
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source "samples/Kconfig"
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source "lib/Kconfig.kgdb"
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@ -39,6 +39,8 @@ obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
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obj-$(CONFIG_TEST_LKM) += test_module.o
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obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o
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obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
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obj-$(CONFIG_TEST_JUMP_LABEL) += test_jump_label.o
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obj-$(CONFIG_TEST_JUMP_LABEL) += test_jump_label_base.o
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ifeq ($(CONFIG_DEBUG_KOBJECT),y)
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CFLAGS_kobject.o += -DDEBUG
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225
lib/test_jump_label.c
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225
lib/test_jump_label.c
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@ -0,0 +1,225 @@
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/*
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* Kernel module for testing jump labels.
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*
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* Copyright 2015 Akamai Technologies Inc. All Rights Reserved
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*
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* Authors:
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* Jason Baron <jbaron@akamai.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/jump_label.h>
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/* old keys */
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struct static_key old_true_key = STATIC_KEY_INIT_TRUE;
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struct static_key old_false_key = STATIC_KEY_INIT_FALSE;
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/* new api */
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DEFINE_STATIC_KEY_TRUE(true_key);
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DEFINE_STATIC_KEY_FALSE(false_key);
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/* external */
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extern struct static_key base_old_true_key;
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extern struct static_key base_inv_old_true_key;
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extern struct static_key base_old_false_key;
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extern struct static_key base_inv_old_false_key;
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/* new api */
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extern struct static_key_true base_true_key;
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extern struct static_key_true base_inv_true_key;
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extern struct static_key_false base_false_key;
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extern struct static_key_false base_inv_false_key;
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struct test_branch {
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bool init_state;
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struct static_key *key;
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bool (*test_key)(void);
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};
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#define test_key_func(key, branch) \
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({bool func(void) { return branch(key); } func; })
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static void invert_key(struct static_key *key)
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{
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if (static_key_enabled(key))
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static_key_disable(key);
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else
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static_key_enable(key);
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}
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static void invert_keys(struct test_branch *branches, int size)
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{
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struct static_key *previous = NULL;
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int i;
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for (i = 0; i < size; i++) {
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if (previous != branches[i].key) {
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invert_key(branches[i].key);
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previous = branches[i].key;
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}
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}
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}
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int verify_branches(struct test_branch *branches, int size, bool invert)
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{
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int i;
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bool ret, init;
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for (i = 0; i < size; i++) {
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ret = static_key_enabled(branches[i].key);
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init = branches[i].init_state;
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if (ret != (invert ? !init : init))
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return -EINVAL;
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ret = branches[i].test_key();
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if (static_key_enabled(branches[i].key)) {
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if (!ret)
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return -EINVAL;
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} else {
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if (ret)
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return -EINVAL;
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}
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}
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return 0;
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}
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static int __init test_jump_label_init(void)
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{
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int ret;
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int size;
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struct test_branch jump_label_tests[] = {
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/* internal keys - old keys */
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{
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.init_state = true,
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.key = &old_true_key,
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.test_key = test_key_func(&old_true_key, static_key_true),
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},
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{
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.init_state = false,
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.key = &old_false_key,
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.test_key = test_key_func(&old_false_key, static_key_false),
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},
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/* internal keys - new keys */
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{
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.init_state = true,
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.key = &true_key.key,
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.test_key = test_key_func(&true_key, static_branch_likely),
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},
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{
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.init_state = true,
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.key = &true_key.key,
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.test_key = test_key_func(&true_key, static_branch_unlikely),
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},
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{
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.init_state = false,
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.key = &false_key.key,
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.test_key = test_key_func(&false_key, static_branch_likely),
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},
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{
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.init_state = false,
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.key = &false_key.key,
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.test_key = test_key_func(&false_key, static_branch_unlikely),
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},
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/* external keys - old keys */
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{
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.init_state = true,
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.key = &base_old_true_key,
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.test_key = test_key_func(&base_old_true_key, static_key_true),
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},
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{
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.init_state = false,
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.key = &base_inv_old_true_key,
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.test_key = test_key_func(&base_inv_old_true_key, static_key_true),
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},
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{
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.init_state = false,
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.key = &base_old_false_key,
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.test_key = test_key_func(&base_old_false_key, static_key_false),
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},
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{
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.init_state = true,
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.key = &base_inv_old_false_key,
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.test_key = test_key_func(&base_inv_old_false_key, static_key_false),
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},
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/* external keys - new keys */
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{
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.init_state = true,
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.key = &base_true_key.key,
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.test_key = test_key_func(&base_true_key, static_branch_likely),
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},
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{
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.init_state = true,
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.key = &base_true_key.key,
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.test_key = test_key_func(&base_true_key, static_branch_unlikely),
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},
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{
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.init_state = false,
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.key = &base_inv_true_key.key,
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.test_key = test_key_func(&base_inv_true_key, static_branch_likely),
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},
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{
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.init_state = false,
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.key = &base_inv_true_key.key,
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.test_key = test_key_func(&base_inv_true_key, static_branch_unlikely),
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},
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{
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.init_state = false,
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.key = &base_false_key.key,
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.test_key = test_key_func(&base_false_key, static_branch_likely),
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},
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{
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.init_state = false,
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.key = &base_false_key.key,
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.test_key = test_key_func(&base_false_key, static_branch_unlikely),
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},
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{
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.init_state = true,
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.key = &base_inv_false_key.key,
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.test_key = test_key_func(&base_inv_false_key, static_branch_likely),
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},
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{
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.init_state = true,
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.key = &base_inv_false_key.key,
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.test_key = test_key_func(&base_inv_false_key, static_branch_unlikely),
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},
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};
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size = ARRAY_SIZE(jump_label_tests);
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ret = verify_branches(jump_label_tests, size, false);
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if (ret)
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goto out;
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invert_keys(jump_label_tests, size);
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ret = verify_branches(jump_label_tests, size, true);
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if (ret)
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goto out;
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invert_keys(jump_label_tests, size);
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ret = verify_branches(jump_label_tests, size, false);
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if (ret)
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goto out;
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return 0;
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out:
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return ret;
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}
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static void __exit test_jump_label_exit(void)
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{
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}
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module_init(test_jump_label_init);
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module_exit(test_jump_label_exit);
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MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
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MODULE_LICENSE("GPL");
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68
lib/test_jump_label_base.c
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68
lib/test_jump_label_base.c
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@ -0,0 +1,68 @@
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/*
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* Kernel module for testing jump labels.
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*
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* Copyright 2015 Akamai Technologies Inc. All Rights Reserved
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*
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* Authors:
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* Jason Baron <jbaron@akamai.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/jump_label.h>
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/* old keys */
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struct static_key base_old_true_key = STATIC_KEY_INIT_TRUE;
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EXPORT_SYMBOL_GPL(base_old_true_key);
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struct static_key base_inv_old_true_key = STATIC_KEY_INIT_TRUE;
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EXPORT_SYMBOL_GPL(base_inv_old_true_key);
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struct static_key base_old_false_key = STATIC_KEY_INIT_FALSE;
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EXPORT_SYMBOL_GPL(base_old_false_key);
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struct static_key base_inv_old_false_key = STATIC_KEY_INIT_FALSE;
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EXPORT_SYMBOL_GPL(base_inv_old_false_key);
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/* new keys */
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DEFINE_STATIC_KEY_TRUE(base_true_key);
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EXPORT_SYMBOL_GPL(base_true_key);
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DEFINE_STATIC_KEY_TRUE(base_inv_true_key);
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EXPORT_SYMBOL_GPL(base_inv_true_key);
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DEFINE_STATIC_KEY_FALSE(base_false_key);
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EXPORT_SYMBOL_GPL(base_false_key);
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DEFINE_STATIC_KEY_FALSE(base_inv_false_key);
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EXPORT_SYMBOL_GPL(base_inv_false_key);
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static void invert_key(struct static_key *key)
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{
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if (static_key_enabled(key))
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static_key_disable(key);
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else
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static_key_enable(key);
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}
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static int __init test_jump_label_base_init(void)
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{
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invert_key(&base_inv_old_true_key);
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invert_key(&base_inv_old_false_key);
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invert_key(&base_inv_true_key.key);
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invert_key(&base_inv_false_key.key);
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return 0;
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}
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static void __exit test_jump_label_base_exit(void)
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{
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}
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module_init(test_jump_label_base_init);
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module_exit(test_jump_label_base_exit);
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MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
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MODULE_LICENSE("GPL");
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@ -20,6 +20,7 @@ ifneq (1, $(quicktest))
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TARGETS += timers
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endif
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TARGETS += user
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TARGETS += jumplabel
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TARGETS += vm
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TARGETS += x86
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#Please keep the TARGETS list alphabetically sorted
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8
tools/testing/selftests/jumplabel/Makefile
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8
tools/testing/selftests/jumplabel/Makefile
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@ -0,0 +1,8 @@
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# Makefile for jump label selftests
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# No binaries, but make sure arg-less "make" doesn't trigger "run_tests"
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all:
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TEST_PROGS := test_jump_label.sh
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include ../lib.mk
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16
tools/testing/selftests/jumplabel/test_jump_label.sh
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16
tools/testing/selftests/jumplabel/test_jump_label.sh
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@ -0,0 +1,16 @@
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#!/bin/sh
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# Runs jump label kernel module tests
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if /sbin/modprobe -q test_jump_label_base; then
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if /sbin/modprobe -q test_jump_label; then
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echo "jump_label: ok"
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/sbin/modprobe -q -r test_jump_label
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/sbin/modprobe -q -r test_jump_label_base
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else
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echo "jump_label: [FAIL]"
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/sbin/modprobe -q -r test_jump_label_base
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fi
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else
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echo "jump_label: [FAIL]"
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exit 1
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fi
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