linux-kernel - Re: [PATCH 4/4] Makefile: add headers

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Date:   Tue, 12 Jul 2022 09:32:36 +0100
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Kees Cook <keescook@...omium.org>, kernel@...labora.com,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 4/4] Makefile: add headers_install to kselftest targets

On 12/07/2022 02:35, Masahiro Yamada wrote:
> On Sat, Jul 9, 2022 at 1:23 AM Guillaume Tucker
> <guillaume.tucker@...labora.com> wrote:
>>
>> Add headers_install as a dependency to kselftest targets so that they
>> can be run directly from the top of the tree.  The kselftest Makefile
>> used to try to call headers_install "backwards" but failed due to the
>> relative path not being consistent.
>>
>> Now we can either run this directly:
>>
>>   $ make O=build kselftest-all
>>
>> or this:
>>
>>   $ make O=build headers_install
>>   $ make O=build -C tools/testing/selftest all
>>
>> The same commands work as well when building directly in the source
>> tree (no O=) or any arbitrary path (relative or absolute).
>>
>> Signed-off-by: Guillaume Tucker <guillaume.tucker@...labora.com>
>> ---
>>  Makefile | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/Makefile b/Makefile
>> index 1a6678d817bd..afc9d739ba44 100644
>> --- a/Makefile
>> +++ b/Makefile
>> @@ -1347,10 +1347,10 @@ tools/%: FORCE
>>  # Kernel selftest
>>
>>  PHONY += kselftest
>> -kselftest:
>> +kselftest: headers_install
>>         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
> 
> Nit.
> Please use 'headers' for in-kernel use of exportedI headers.
> 
> kselftest: headers
> 
> 
>>
>> -kselftest-%: FORCE
>> +kselftest-%: headers_install FORCE
>>         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
> 
> Ditto.
> 
> kselftest-%: headers FORCE

Thank you all for the reviews.

I've sent a v2 with this tweak and double-checked that the
kselftest build produced exactly the same result.

Best wishes,
Guillaume