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

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Message-ID: <0eeed665-a105-917b-e7fb-8dafe2ae9d94@de.ibm.com>
Date:   Fri, 16 Apr 2021 07:56:18 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org
Cc:     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@...r.kernel.org, clang-built-linux@...glegroups.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] tools: do not include scripts/Kbuild.include


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.