netdev - Re: Linux 5.4 - bpf test build fails

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Date:   Tue, 24 Sep 2019 18:29:36 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     Shuah Khan <skhan@...uxfoundation.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: Linux 5.4 - bpf test build fails

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 

with the SUBTARGETS= or whatever ENV var handling delegated to the lower level
makefiles (so not handled by the toplevel, but just let go through)

Cheers

Cristian

> 
> That way we can support all the use-cases from the main Makefile
> 
> thanks,
> -- Shuah
> 
>