kcsan: Make test follow KUnit style recommendations

Per recently added KUnit style recommendations at
Documentation/dev-tools/kunit/style.rst, make the following changes to
the KCSAN test:

	1. Rename 'kcsan-test.c' to 'kcsan_test.c'.

	2. Rename suite name 'kcsan-test' to 'kcsan'.

	3. Rename CONFIG_KCSAN_TEST to CONFIG_KCSAN_KUNIT_TEST and
	   default to KUNIT_ALL_TESTS.

Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

kernel/kcsan/Makefile

@@ -13,5 +13,5 @@ CFLAGS_core.o := $(call cc-option,-fno-conserve-stack) \
 obj-y := core.o debugfs.o report.o
 obj-$(CONFIG_KCSAN_SELFTEST) += selftest.o
 
-CFLAGS_kcsan-test.o := $(CFLAGS_KCSAN) -g -fno-omit-frame-pointer
-obj-$(CONFIG_KCSAN_TEST) += kcsan-test.o
+CFLAGS_kcsan_test.o := $(CFLAGS_KCSAN) -g -fno-omit-frame-pointer
+obj-$(CONFIG_KCSAN_KUNIT_TEST) += kcsan_test.o

kernel/kcsan/kcsan_test.c

@@ -1156,7 +1156,7 @@ static void test_exit(struct kunit *test)
 }
 
 static struct kunit_suite kcsan_test_suite = {
-	.name = "kcsan-test",
+	.name = "kcsan",
 	.test_cases = kcsan_test_cases,
 	.init = test_init,
 	.exit = test_exit,

lib/Kconfig.kcsan

@@ -69,8 +69,9 @@ config KCSAN_SELFTEST
 	  panic. Recommended to be enabled, ensuring critical functionality
 	  works as intended.
 
-config KCSAN_TEST
-	tristate "KCSAN test for integrated runtime behaviour"
+config KCSAN_KUNIT_TEST
+	tristate "KCSAN test for integrated runtime behaviour" if !KUNIT_ALL_TESTS
+	default KUNIT_ALL_TESTS
 	depends on TRACEPOINTS && KUNIT
 	select TORTURE_TEST
 	help