On Tue, Jan 03, 2023 at 08:19:55AM +0100, Sven Schnelle wrote: > Signed-off-by: Sven Schnelle <svens@xxxxxxxxxxxxx> > Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx> > --- > tools/testing/selftests/nolibc/Makefile | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) ... > -CFLAGS ?= -Os -fno-ident -fno-asynchronous-unwind-tables > +CFLAGS_s390 = -m64 > +CFLAGS ?= -Os -fno-ident -fno-asynchronous-unwind-tables $(CFLAGS_$(ARCH)) Since this adds support for architecture specific compile flags, you might as well want to add -march=z10, since that's the minimum architecture level for the kernel we support anyway. That way you won't end up with problems like the lay instruction, and could also use cghsi for zero comparison. Not that I'm proposing that you should change the asm code again, it is fine as it is now.
