linux-kernel - Re: [PATCH v3 11/11] selftests: error out if kernel header files are not yet built

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Date:   Fri, 3 Nov 2023 14:00:46 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     John Hubbard <jhubbard@...dia.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Xu <peterx@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org
Subject: Re: [PATCH v3 11/11] selftests: error out if kernel header files are
 not yet built

On 03.11.23 13:59, David Hildenbrand wrote:
> On 03.11.23 13:46, Peter Zijlstra wrote:
>> On Fri, Nov 03, 2023 at 01:22:54PM +0100, David Hildenbrand wrote:
>>> On 03.11.23 13:16, Peter Zijlstra wrote:
>>>> On Tue, Jun 06, 2023 at 12:16:37AM -0700, John Hubbard wrote:
>>>>> As per a discussion with Muhammad Usama Anjum [1], the following is how
>>>>> one is supposed to build selftests:
>>>>>
>>>>>        make headers && make -C tools/testing/selftests/mm
>>>>>
>>>>> Change the selftest build system's lib.mk to fail out with a helpful
>>>>> message if that prerequisite "make headers" has not been done yet.
>>>>>
>>>>
>>>> NAK NAK NAK
>>>>
>>>> This now means I can no longer run selftests, I thank you very much! :-/
>>>>
>>>> root@spr:/usr/src/linux-2.6# make O=defconfig-build/ -j64
>>>> make[1]: Entering directory '/usr/src/linux-2.6/defconfig-build'
>>>> ***
>>>> *** The source tree is not clean, please run 'make mrproper'
>>>> *** in /usr/src/linux-2.6
>>>>
>>>>
>>>> I've always done:
>>>>
>>>>      cd tools/testing/selftests/x86; make
>>>>
>>>> and that has always worked
>>>>
>>>> Now I can't bloody well build *any* selftest or risk not being able to
>>>> do builds.
>>>
>>> This change landed in 6.5, no? And 6.6 was just released. Just curious why
>>> you notice that now.
>>
>> Dunno, last time I edited the selftests and needed to recompile was a
>> few weeks ago.
> 
> Okay. the question is if your workflow can be easily adjusted, or if we
> can improve that header handling as a whole.
> 
> The problem I had with this recently: just because we did a "make
> headers" once in a git tree doesn't mean that it is still up-to-date.
> 
> So once some selftest changes showed up that require newer headers,
> building the selftests again fails without a hint that another round of
> "make headers" would be required.

To clarify: maybe some kind of a warning would be better, ideally that 
the headers might be outdated and that another "make headers" would be 
required in case there are any build errors.

-- 
Cheers,

David / dhildenb