linux-libre/scripts/Makefile.kasan

ifdef CONFIG_KASAN
ifdef CONFIG_KASAN_INLINE
	call_threshold := 10000
else
	call_threshold := 0
endif

KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)

CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address

CFLAGS_KASAN := $(call cc-option, -fsanitize=kernel-address \
		-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET) \
		--param asan-stack=1 --param asan-globals=1 \
		--param asan-instrumentation-with-call-threshold=$(call_threshold))

ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
   ifneq ($(CONFIG_COMPILE_TEST),y)
        $(warning Cannot use CONFIG_KASAN: \
            -fsanitize=kernel-address is not supported by compiler)
   endif
else
    ifeq ($(CFLAGS_KASAN),)
        ifneq ($(CONFIG_COMPILE_TEST),y)
            $(warning CONFIG_KASAN: compiler does not support all options.\
                Trying minimal configuration)
        endif
        CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
    endif
endif
endif