locking/static_keys: Provide a selftest

The 'jump label' self-test is in reality testing static keys - rename things
accordingly.

Also prettify the code in various places while at it.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
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: 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>

lib/Kconfig.debug

@@ -1841,12 +1841,12 @@ 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"
+config TEST_STATIC_KEYS
+	tristate "Test static keys"
 	default n
 	depends on m
 	help
-	  Test jump labels.
+	  Test the static key interfaces.
 
 	  If unsure, say N.
 

lib/Makefile

@@ -39,8 +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
+obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_keys.o
+obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o
 
 ifeq ($(CONFIG_DEBUG_KOBJECT),y)
 CFLAGS_kobject.o += -DDEBUG

lib/test_jump_label_base.c → lib/test_static_key_base.c

@@ -1,5 +1,5 @@
 /*
- * Kernel module for testing jump labels.
+ * Kernel module for testing static keys.
  *
  * Copyright 2015 Akamai Technologies Inc. All Rights Reserved
  *
@@ -47,7 +47,7 @@ static void invert_key(struct static_key *key)
 		static_key_enable(key);
 }
 
-static int __init test_jump_label_base_init(void)
+static int __init test_static_key_base_init(void)
 {
 	invert_key(&base_inv_old_true_key);
 	invert_key(&base_inv_old_false_key);
@@ -57,12 +57,12 @@ static int __init test_jump_label_base_init(void)
 	return 0;
 }
 
-static void __exit test_jump_label_base_exit(void)
+static void __exit test_static_key_base_exit(void)
 {
 }
 
-module_init(test_jump_label_base_init);
-module_exit(test_jump_label_base_exit);
+module_init(test_static_key_base_init);
+module_exit(test_static_key_base_exit);
 
 MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
 MODULE_LICENSE("GPL");