kasan: move tests to mm/kasan/

Move KASAN tests to mm/kasan/ to keep the test code alongside the
implementation.

Link: https://lkml.kernel.org/r/676398f0aeecd47d2f8e3369ea0e95563f641a36.1662416260.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

MAINTAINERS

@@ -10938,7 +10938,6 @@ F:	arch/*/include/asm/*kasan.h
 F:	arch/*/mm/kasan_init*
 F:	include/linux/kasan*.h
 F:	lib/Kconfig.kasan
-F:	lib/test_kasan*.c
 F:	mm/kasan/
 F:	scripts/Makefile.kasan
 

lib/Makefile

@@ -65,11 +65,6 @@ obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
 obj-$(CONFIG_TEST_SIPHASH) += test_siphash.o
 obj-$(CONFIG_HASH_KUNIT_TEST) += test_hash.o
 obj-$(CONFIG_TEST_IDA) += test_ida.o
-obj-$(CONFIG_KASAN_KUNIT_TEST) += test_kasan.o
-CFLAGS_test_kasan.o += -fno-builtin
-CFLAGS_test_kasan.o += $(call cc-disable-warning, vla)
-obj-$(CONFIG_KASAN_MODULE_TEST) += test_kasan_module.o
-CFLAGS_test_kasan_module.o += -fno-builtin
 obj-$(CONFIG_TEST_UBSAN) += test_ubsan.o
 CFLAGS_test_ubsan.o += $(call cc-disable-warning, vla)
 UBSAN_SANITIZE_test_ubsan.o := y

mm/kasan/Makefile

@@ -35,7 +35,15 @@ CFLAGS_shadow.o := $(CC_FLAGS_KASAN_RUNTIME)
 CFLAGS_hw_tags.o := $(CC_FLAGS_KASAN_RUNTIME)
 CFLAGS_sw_tags.o := $(CC_FLAGS_KASAN_RUNTIME)
 
+CFLAGS_KASAN_TEST := $(CFLAGS_KASAN) -fno-builtin $(call cc-disable-warning, vla)
+
+CFLAGS_kasan_test.o := $(CFLAGS_KASAN_TEST)
+CFLAGS_kasan_test_module.o := $(CFLAGS_KASAN_TEST)
+
 obj-y := common.o report.o
 obj-$(CONFIG_KASAN_GENERIC) += init.o generic.o report_generic.o shadow.o quarantine.o
 obj-$(CONFIG_KASAN_HW_TAGS) += hw_tags.o report_hw_tags.o tags.o report_tags.o
 obj-$(CONFIG_KASAN_SW_TAGS) += init.o report_sw_tags.o shadow.o sw_tags.o tags.o report_tags.o
+
+obj-$(CONFIG_KASAN_KUNIT_TEST) += kasan_test.o
+obj-$(CONFIG_KASAN_MODULE_TEST) += kasan_test_module.o

mm/kasan/kasan_test.c

@@ -25,7 +25,7 @@
 
 #include <kunit/test.h>
 
-#include "../mm/kasan/kasan.h"
+#include "kasan.h"
 
 #define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE)
 

mm/kasan/kasan_test_module.c

@@ -13,7 +13,7 @@
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 
-#include "../mm/kasan/kasan.h"
+#include "kasan.h"
 
 static noinline void __init copy_user_test(void)
 {