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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
Date:   Tue, 7 Aug 2018 11:32:26 +0900
Message-ID: <CAK7LNAQ6hNmjmZc8J54KWCtR6x4Megn3mbdzprGgSZL5Zk9GCg@mail.gmail.com>
Subject: Re: [PATCH v4] selftests: add headers_install to lib.mk
To:     Shuah Khan <shuah@kernel.org>
Cc:     Anders Roxell <anders.roxell@linaro.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Bamvor Zhang <bamv2005@gmail.com>, brgl@bgdev.pl,
        Paolo Bonzini <pbonzini@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>,
        Networking <netdev@vger.kernel.org>
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2018-08-07 2:03 GMT+09:00 Shuah Khan <shuah@kernel.org>:
> Hi Anders,
>
> On 07/25/2018 10:08 AM, Anders Roxell wrote:
>> On Tue, 24 Jul 2018 at 19:11, Shuah Khan <shuah@kernel.org> wrote:
>>>
>>> On 07/23/2018 02:49 PM, Anders Roxell wrote:
>>>> On Thu, 7 Jun 2018 at 13:09, Anders Roxell <anders.roxell@linaro.org> wrote:
>>>>>
>>>>> If the kernel headers aren't installed we can't build all the tests.
>>>>> Add a new make target rule 'khdr' in the file lib.mk to generate the
>>>>> kernel headers and that gets include for every test-dir Makefile that
>>>>> includes lib.mk If the testdir in turn have its own sub-dirs the
>>>>> top_srcdir needs to be set to the linux-rootdir to be able to generate
>>>>> the kernel headers.
>>>>>
>>>>> Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
>>>>> Reviewed-by: Fathi Boudra <fathi.boudra@linaro.org>
>>>>> ---
>>>>>  Makefile                                           | 14 +-------------
>>>>>  scripts/subarch.include                            | 13 +++++++++++++
>>>>>  tools/testing/selftests/android/Makefile           |  2 +-
>>>>>  tools/testing/selftests/android/ion/Makefile       |  2 ++
>>>>>  tools/testing/selftests/futex/functional/Makefile  |  1 +
>>>>>  tools/testing/selftests/gpio/Makefile              |  7 ++-----
>>>>>  tools/testing/selftests/kvm/Makefile               |  7 ++-----
>>>>>  tools/testing/selftests/lib.mk                     | 12 ++++++++++++
>>>>>  tools/testing/selftests/net/Makefile               |  1 +
>>>>>  .../selftests/networking/timestamping/Makefile     |  1 +
>>>>>  tools/testing/selftests/vm/Makefile                |  4 ----
>>>>>  11 files changed, 36 insertions(+), 28 deletions(-)
>>>>>  create mode 100644 scripts/subarch.include
>>>>>
>>>>> diff --git a/Makefile b/Makefile
>>>>> index 6b9aea95ae3a..8050072300fa 100644
>>>>> --- a/Makefile
>>>>> +++ b/Makefile
>>>>> @@ -286,19 +286,7 @@ KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
>>>>>  KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
>>>>>  export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
>>>>>
>>>>> -# SUBARCH tells the usermode build what the underlying arch is.  That is set
>>>>> -# first, and if a usermode build is happening, the "ARCH=um" on the command
>>>>> -# line overrides the setting of ARCH below.  If a native build is happening,
>>>>> -# then ARCH is assigned, getting whatever value it gets normally, and
>>>>> -# SUBARCH is subsequently ignored.
>>>>> -
>>>>> -SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
>>>>> -                                 -e s/sun4u/sparc64/ \
>>>>> -                                 -e s/arm.*/arm/ -e s/sa110/arm/ \
>>>>> -                                 -e s/s390x/s390/ -e s/parisc64/parisc/ \
>>>>> -                                 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
>>>>> -                                 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
>>>>> -                                 -e s/riscv.*/riscv/)
>>>>> +include scripts/subarch.include
>>>
>>> What is the reason for this SUBARCH block move to to scripts/subarch.include?
>>> Is this necessary for adding headers install dependency to lib.mk?
>>
>> This is needed to create headers for cross build.
>>
>
> I am sorry for the delay on this patch. I am going to get this into 4.19.
> If anybody has objections, please let me.
>
> Anders! Will be able to rebase the patch and send me the latest. I think
> I have Acks from kvm, android, and vm so far.
>


I may be missing something about the tools/ directory,
but why isn't it like this?


kselftest: headers_install
        $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests


-- 
Best Regards
Masahiro Yamada