s390/kasan: avoid instrumentation of early C code

Instrumented C code cannot run without the kasan shadow area. Exempt
source code files from kasan which are running before / used during
kasan initialization.
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/boot/Makefile

@@ -6,6 +6,7 @@
 KCOV_INSTRUMENT := n
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
 
 KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR)
 KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR)

arch/s390/boot/compressed/Makefile

@@ -8,6 +8,7 @@
 KCOV_INSTRUMENT := n
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
 
 obj-y	:= $(if $(CONFIG_KERNEL_UNCOMPRESSED),,decompressor.o) piggy.o info.o
 targets	:= vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2

arch/s390/kernel/Makefile

@@ -23,6 +23,8 @@ KCOV_INSTRUMENT_early_nobss.o	:= n
 UBSAN_SANITIZE_early.o		:= n
 UBSAN_SANITIZE_early_nobss.o	:= n
 
+KASAN_SANITIZE_early_nobss.o	:= n
+
 #
 # Passing null pointers is ok for smp code, since we access the lowcore here.
 #

drivers/s390/char/Makefile

@@ -11,6 +11,7 @@ endif
 GCOV_PROFILE_sclp_early_core.o		:= n
 KCOV_INSTRUMENT_sclp_early_core.o	:= n
 UBSAN_SANITIZE_sclp_early_core.o	:= n
+KASAN_SANITIZE_sclp_early_core.o	:= n
 
 CFLAGS_sclp_early_core.o		+= -D__NO_FORTIFY