linux-kernel - Re: [PATCH V2] selftests: Fix build when $(O) points to a relative path

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Date:   Thu, 3 Mar 2022 15:19:55 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>
Cc:     kernel@...labora.com, kernelci@...ups.io,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH V2] selftests: Fix build when $(O) points to a relative
 path

On 2/26/22 12:32 AM, Muhammad Usama Anjum wrote:
> On 2/26/22 2:13 AM, Shuah Khan wrote:
>> On 2/25/22 11:01 AM, Shuah Khan wrote:
>>> On 2/25/22 10:22 AM, Muhammad Usama Anjum wrote:
>>>> Any thoughts about it?
>>>>
>>>
>>> No to post please.
>>>
>>>> On 2/17/22 3:38 AM, Muhammad Usama Anjum wrote:
>>>>> Build of bpf and tc-testing selftests fails when the relative path of
>>>>> the build directory is specified.
>>>>>
>>>>> make -C tools/testing/selftests O=build0
>>>>> make[1]: Entering directory
>>>>> '/linux_mainline/tools/testing/selftests/bpf'
>>>>> ../../../scripts/Makefile.include:4: *** O=build0 does not exist.
>>>>> Stop.
>>>>> make[1]: Entering directory
>>>>> '/linux_mainline/tools/testing/selftests/tc-testing'
>>>>> ../../../scripts/Makefile.include:4: *** O=build0 does not exist.
>>>>> Stop.
>>>>>
>>>>> Makefiles of bpf and tc-testing include scripts/Makefile.include file.
>>>>> This file has sanity checking inside it which checks the output path.
>>>>> The output path is not relative to the bpf or tc-testing. The sanity
>>>>> check fails. Expand the output path to get rid of this error. The
>>>>> fix is
>>>>> the same as mentioned in commit 150a27328b68 ("bpf, preload: Fix build
>>>>> when $(O) points to a relative path").
>>>>>
>>>>> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
>>>>> ---
>>>>> Changes in V2:
>>>>> Add more explaination to the commit message.
>>>>> Support make install as well.
>>>
>>
>> Does the same happen when you use make kselftest-all?
> No, this problem doesn't appear when using make kselftest-all.
> 
> As separate output directory build was broken in kernel's top most
> Makefile i.e., make kselftest-all O=dir. (I've sent separate patch to
> fix this:
> https://lore.kernel.org/lkml/20220223191016.1658728-1-usama.anjum@collabora.com/)
> So people must have been using kselftest's internal Makefile directly to
> keep object files in separate directory i.e., make -C
> tools/testing/selftests O=dir and in this way the build of these tests
> (bpf, tc-testing) fail. This patch is fixing those build errors.
> 
>>
>> I am unable to reproduce what you are seeing?
> make -C tools/testing/selftests O=dir should reproduce this problem.
> 

Applied to linux-kselftest next for Linux 5.18-rc1.

thanks,
-- Shuah