netdev - Re: [PATCH 2/2] tools: do not include scripts/Kbuild.include

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Date:   Fri, 16 Apr 2021 21:53:18 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Christian Borntraeger <borntraeger@...ibm.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Harish <harish@...ux.ibm.com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Martin KaFai Lau <kafai@...com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        bpf <bpf@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        kvm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] tools: do not include scripts/Kbuild.include

On Fri, Apr 16, 2021 at 2:56 PM Christian Borntraeger
<borntraeger@...ibm.com> wrote:
>
>
> On 15.04.21 10:06, Christian Borntraeger wrote:
> >
> > On 15.04.21 09:27, Masahiro Yamada wrote:
> >> Since commit d9f4ff50d2aa ("kbuild: spilt cc-option and friends to
> >> scripts/Makefile.compiler"), some kselftests fail to build.
> >>
> >> The tools/ directory opted out Kbuild, and went in a different
> >> direction. They copy any kind of files to the tools/ directory
> >> in order to do whatever they want to do in their world.
> >>
> >> tools/build/Build.include mimics scripts/Kbuild.include, but some
> >> tool Makefiles included the Kbuild one to import a feature that is
> >> missing in tools/build/Build.include:
> >>
> >>   - Commit ec04aa3ae87b ("tools/thermal: tmon: use "-fstack-protector"
> >>     only if supported") included scripts/Kbuild.include from
> >>     tools/thermal/tmon/Makefile to import the cc-option macro.
> >>
> >>   - Commit c2390f16fc5b ("selftests: kvm: fix for compilers that do
> >>     not support -no-pie") included scripts/Kbuild.include from
> >>     tools/testing/selftests/kvm/Makefile to import the try-run macro.
> >>
> >>   - Commit 9cae4ace80ef ("selftests/bpf: do not ignore clang
> >>     failures") included scripts/Kbuild.include from
> >>     tools/testing/selftests/bpf/Makefile to import the .DELETE_ON_ERROR
> >>     target.
> >>
> >>   - Commit 0695f8bca93e ("selftests/powerpc: Handle Makefile for
> >>     unrecognized option") included scripts/Kbuild.include from
> >>     tools/testing/selftests/powerpc/pmu/ebb/Makefile to import the
> >>     try-run macro.
> >>
> >> Copy what they want there, and stop including scripts/Kbuild.include
> >> from the tool Makefiles.
> >>
> >> Link: https://lore.kernel.org/lkml/86dadf33-70f7-a5ac-cb8c-64966d2f45a1@linux.ibm.com/
> >> Fixes: d9f4ff50d2aa ("kbuild: spilt cc-option and friends to scripts/Makefile.compiler")
> >> Reported-by: Janosch Frank <frankja@...ux.ibm.com>
> >> Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
> >> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> >
> > When applying this on top of d9f4ff50d2aa ("kbuild: spilt cc-option and friends to scripts/Makefile.compiler")
> >
> > I still do get
> >
> > # ==== Test Assertion Failure ====
> > #   lib/kvm_util.c:142: vm->fd >= 0
> > #   pid=315635 tid=315635 - Invalid argument
> > #      1    0x0000000001002f4b: vm_open at kvm_util.c:142
> > #      2     (inlined by) vm_create at kvm_util.c:258
> > #      3    0x00000000010015ef: test_add_max_memory_regions at set_memory_region_test.c:351
> > #      4     (inlined by) main at set_memory_region_test.c:397
> > #      5    0x000003ff971abb89: ?? ??:0
> > #      6    0x00000000010017ad: .annobin_abi_note.c.hot at crt1.o:?
> > #   KVM_CREATE_VM ioctl failed, rc: -1 errno: 22
> > not ok 7 selftests: kvm: set_memory_region_test # exit=254
> >
> > and the testcase compilation does not pickup the pgste option.
>
> What does work is the following:
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index a6d61f451f88..d9c6d9c2069e 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -1,5 +1,6 @@
>   # SPDX-License-Identifier: GPL-2.0-only
>   include ../../../../scripts/Kbuild.include
> +include ../../../../scripts/Makefile.compiler
>
>   all:
>
>
> as it does pickup the linker option handling.


Kbuild and the tools are divorced.

They cannot be married unless the tools/
build system is largely refactored.
That will be a tons of works (and
I am not sure if it is welcome).

The Kbuild refactoring should not be bothered by
the tools.
For now, I want them separated from each other.



--
Best Regards

Masahiro Yamada