linux-stable/scripts/Makefile.kcov

ifdef CONFIG_KCOV
CFLAGS_KCOV	:= $(call cc-option,-fsanitize-coverage=trace-pc,)
ifeq ($(CONFIG_KCOV_ENABLE_COMPARISONS),y)
CFLAGS_KCOV += $(call cc-option,-fsanitize-coverage=trace-cmp,)
endif

endif
Makefile: support flag -fsanitizer-coverage=trace-cmp The flag enables Clang instrumentation of comparison operations (currently not supported by GCC). This instrumentation is needed by the new KCOV device to collect comparison operands. Link: http://lkml.kernel.org/r/20171011095459.70721-2-glider@google.com Signed-off-by: Victor Chibotaru <tchibo@google.com> Signed-off-by: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Alexander Popov <alex.popov@linux.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Kees Cook <keescook@chromium.org> Cc: Vegard Nossum <vegard.nossum@oracle.com> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: <syzkaller@googlegroups.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 2017-11-17 23:30:50 +00:00			`ifdef CONFIG_KCOV`
			`CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)`
			`ifeq ($(CONFIG_KCOV_ENABLE_COMPARISONS),y)`
			`CFLAGS_KCOV += $(call cc-option,-fsanitize-coverage=trace-cmp,)`
			`endif`

			`endif`