netdev - Re: Linux 5.4 - bpf test build fails

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Date:   Tue, 24 Sep 2019 12:23:12 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Tim.Bird@...y.com, cristian.marussi@....com,
        alexei.starovoitov@...il.com, daniel@...earbox.net
Cc:     linux-kselftest@...r.kernel.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org, davem@...emloft.net,
        "skh >> Shuah Khan" <skhan@...uxfoundation.org>
Subject: Re: Linux 5.4 - bpf test build fails

On 9/24/19 12:07 PM, Tim.Bird@...y.com wrote:
> 
> 
>> -----Original Message-----
>> From: Cristian Marussi on Tuesday, September 24, 2019 7:30 AM
>>
>> Hi Shuah
>>
>> On 24/09/2019 17:39, Shuah Khan wrote:
>>> On 9/24/19 10:03 AM, Shuah Khan wrote:
>>>> On 9/24/19 9:52 AM, Cristian Marussi wrote:
>>>>> Hi Shuah
>>>>>
>>>>> On 24/09/2019 16:26, Shuah Khan wrote:
>>>>>> Hi Alexei and Daniel,
>>>>>>
>>>>>> bpf test doesn't build on Linux 5.4 mainline. Do you know what's
>>>>>> happening here.
>>>>>>
>>>>>>
>>>>>> make -C tools/testing/selftests/bpf/
>>>>>
>>>>> side question, since I'm writing arm64/ tests.
>>>>>
>>>>> my "build-testcases" following the KSFT docs are:
>>>>>
>>>>> make kselftest
>>>>> make TARGETS=arm64 kselftest
>>>>> make -C tools/testing/selftests/
>>>>> make -C tools/testing/selftests/ INSTALL_PATH=<install-path> install
>>>>> make TARGETS=arm64 -C tools/testing/selftests/
>>>>> make TARGETS=arm64 -C tools/testing/selftests/
>>>>> INSTALL_PATH=<install-path> install
>>>>> ./kselftest_install.sh <install-path>
>>>
>>> Cristian,
>>>
>>> That being said, I definitely want to see this list limited to
>>> a few options.
>>>
>>> One problem is that if somebody wants to do just a build, there
>>> is no option from the main makefile. I have sent support for that
>>> a few months ago and the patch didn't got lost it appears. I am
>>> working on resending those patches. The same is true for install.
>>> I sent in a patch for that a while back and I am going to resend.
>>> These will make it easier for users.
>>>
>>> I would really want to get to supporting only these options:
>>>
>>> These are supported now:
>>>
>>> make kselftest
>>> make TARGETS=arm64 kselftest (one or more targets)
>>>
>>> Replace the following:
>>>
>>> make -C tools/testing/selftests/ with
>>>
>>> make kselftes_build option from main makefile
>>>
>>> Replace this:
>>> make -C tools/testing/selftests/ INSTALL_PATH=<install-path> install
>>>
>>> with
>>> make kselftest_install
>>
>> Yes these top level options would be absolutely useful to avoid multiplication
>> of build targets to support and test.
>>
>> Moreover, currently, since there was a lot of test growing into arm64/
>> inside subdirs like arm64/signal, I support (still under review in fact) in the
>> arm64/
>> toplevel makefile the possibility of building/installing by subdirs only, in order
>> to be able to limit what you want to build/install of a TARGET (resulting in
>> quicker devel),
>> issuing something like:
>>
>> make TARGETS=arm64 SUBTARGETS=signal -C tools/testing/selftests/
>>
>> if possible, that would be useful if kept functional even in the
>> new schema. I mean being able to still issue:
>>
>> make TARGETS=arm64 SUBTARGETS=signal kselftes_build
> 
>  From a user perspective, instead of adding a new SUBTARGETS variable,
> I would prefer something like the following:
> 
> make TARGET=arm64/signal kselftest_build
> 
> If you just add a single flat subsidiary namespace, then it doesn't support further
> increasing the directory depth in the future.
> 

TARGETS is make variable. Adding sub-targets might not be easy without
cluttering the selftests main Makefile. I will have to look into it.

thanks,
-- Shuah