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Subject: Re: [GIT PULL] Kselftest update for Linux 5.20-rc1
To:     Guillaume Tucker <guillaume.tucker@collabora.com>,
        =?UTF-8?Q?Micka=c3=abl_Sala=c3=bcn?= <mic@digikod.net>,
        Linus Torvalds <torvalds@linux-foundation.org>
Cc:     linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
        Masahiro Yamada <masahiroy@kernel.org>,
        linux-security-module <linux-security-module@vger.kernel.org>,
        Shuah Khan <skhan@linuxfoundation.org>
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 <7a412c45-4536-1f0b-d04e-24b2063ac034@collabora.com>
From:   Shuah Khan <skhan@linuxfoundation.org>
Message-ID: <c227526a-6cf6-247a-df8f-6574e3c748ad@linuxfoundation.org>
Date:   Wed, 3 Aug 2022 17:12:31 -0600
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On 8/3/22 2:22 PM, Guillaume Tucker wrote:
> On 03/08/2022 16:32, Shuah Khan wrote:
>> On 8/2/22 10:44 PM, Guillaume Tucker wrote:
>>> On 02/08/2022 15:29, Shuah Khan wrote:
>>>> On 8/2/22 3:51 AM, Mickaël Salaün wrote:
>>>>> Hi,
>>>>>
>>>>> This change breaks the Landlock test build when performed on the tools/testing/selftests/landlock directory because the (non-system/up-to-date) kernel headers aren't found. Looking at the use of top_srcdir and HDR_PATH, it seems that multiple subsystems are using this feature. I consider this change a regression.
>>>>>
>>>>
>>>> I did a build test from the top level before sending the pull request
>>>> and didn't catch this breakage as a result. This breaks when build is
>>>> run from the test directory.
>>>>
>>>> We have had several problems related to khdr_dir and target and decided
>>>> to move away from it with this change.
>>>>
>>>>> It also removes the check on up-to-date kernel headers (thanks to the Makefile's target timestamp).
>>>>>
>>>>> I wasn't CCed for this change impacting Landlock [1]. Please keep in mind to add at least maintainers and related mailing-lists for changes on related subsystems.
>>>>>
>>>>
>>>> That is the usual practice and if I notice missing maintainers, I add
>>>> them. We missed this one.
>>>>
>>>>> The following patch almost revert commit a917dd94b832 ("selftests/landlock: drop deprecated headers dependency") and partially fixes commit 49de12ba06ef ("selftests: drop KSFT_KHDR_INSTALL make target"):
>>>>>
>>>>
>>>> Guillaume,
>>>>
>>>> Will you be able to look at this and send a patch on top? I will
>>>> send another pull request before merge window closes?
>>>
>>> Sure, I'll take a look today.
>>>
>>
>> Thank you.
> 
> OK I just sent "selftests/landlock: fix broken include of linux/landlock.h"
> 
> This does fix the build when doing:
> 
>    make -C tools/testing/selftests/landlock
> 

Thank you for fixing this quickly.

> However I've also noticed the landlock test is failing to build
> when make is invoked from the top-level directory and using a
> sub-directory for the build output, in other words my earlier
> patches didn't fix the build for this test, but that's not a
> regression.
> 

Okay.

> I'll see if that can be fixed too while also not breaking
> the "-C" sub-make build.
> 

Sounds good. Supporting all these use-cases makes it a bit hard.

>>> Also I'll see if we can add some extra build tests in KernelCI
>>> for the kselftest tree to catch issues like these automatically.
>>>
>>

> Great.  Well I shall try and get that set up before making further changes ;)
> 

Thanks.

> 
> P.S. The output of gen_tar is showing "-ne " on every line, is that expected?
>       For example: -ne Emit Tests for alsa
> 

Hmm. I will try and let you. I haven't used this one in a bit.

thanks,
-- Shuah