netdev - Re: [PATCH v4 bpf-next 1/4] selftests/bpf: compile progs with -D__TARGET_ARCH

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Date:   Fri, 12 Jul 2019 10:28:28 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Ilya Leoshkevich <iii@...ux.ibm.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Y Song <ys114321@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Stanislav Fomichev <sdf@...ichev.me>,
        "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH v4 bpf-next 1/4] selftests/bpf: compile progs with -D__TARGET_ARCH_$(SRCARCH)

On Fri, Jul 12, 2019 at 2:00 AM Ilya Leoshkevich <iii@...ux.ibm.com> wrote:
>
> > Am 12.07.2019 um 02:53 schrieb Andrii Nakryiko <andrii.nakryiko@...il.com>:
> >
> > On Thu, Jul 11, 2019 at 7:32 AM Ilya Leoshkevich <iii@...ux.ibm.com> wrote:
> >>
> >> This opens up the possibility of accessing registers in an
> >> arch-independent way.
> >>
> >> Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>
> >> ---
> >> tools/testing/selftests/bpf/Makefile | 4 +++-
> >> 1 file changed, 3 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> >> index 2620406a53ec..ad84450e4ab8 100644
> >> --- a/tools/testing/selftests/bpf/Makefile
> >> +++ b/tools/testing/selftests/bpf/Makefile
> >> @@ -1,4 +1,5 @@
> >> # SPDX-License-Identifier: GPL-2.0
> >> +include ../../../scripts/Makefile.arch
> >>
> >> LIBDIR := ../../../lib
> >> BPFDIR := $(LIBDIR)/bpf
> >> @@ -138,7 +139,8 @@ CLANG_SYS_INCLUDES := $(shell $(CLANG) -v -E - </dev/null 2>&1 \
> >>
> >> CLANG_FLAGS = -I. -I./include/uapi -I../../../include/uapi \
> >>              $(CLANG_SYS_INCLUDES) \
> >> -             -Wno-compare-distinct-pointer-types
> >> +             -Wno-compare-distinct-pointer-types \
> >> +             -D__TARGET_ARCH_$(SRCARCH)
> >
> > samples/bpf/Makefile uses $(ARCH), why does it work for samples?
> > Should we update samples/bpf/Makefile as well?
>
> I believe that in common cases both are okay, but judging by
> linux:Makefile and linux:tools/scripts/Makefile.arch, one could use e.g.
> ARCH=i686, and that would be converted to SRCARCH=x86. So IMHO SRCARCH
> is safer, and we should change bpf/samples/Makefile. I could send a
> patch separately.

Yeah, let's do that then, thanks!