linux-kernel - Re: [PATCH] kunit: tool: make --kunitconfig accept dirs, add lib/kunit fragment

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Date:   Fri, 2 Apr 2021 13:31:17 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Daniel Latypov <dlatypov@...gle.com>
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        David Gow <davidgow@...gle.com>,
        KUnit Development <kunit-dev@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, Theodore Ts'o <tytso@....edu>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] kunit: tool: make --kunitconfig accept dirs, add
 lib/kunit fragment

On 4/2/21 1:27 PM, Daniel Latypov wrote:
> On Fri, Apr 2, 2021 at 11:00 AM Shuah Khan <skhan@...uxfoundation.org> wrote:
>>
>> On 4/2/21 3:32 AM, Brendan Higgins wrote:
>>>> TL;DR
>>>> $ ./tools/testing/kunit/kunit.py run --kunitconfig=lib/kunit
>>>>
>>>> Per suggestion from Ted [1], we can reduce the amount of typing by
>>>> assuming a convention that these files are named '.kunitconfig'.
>>>>
>>>> In the case of [1], we now have
>>>> $ ./tools/testing/kunit/kunit.py run --kunitconfig=fs/ext4
>>>>
>>>> Also add in such a fragment for kunit itself so we can give that as an
>>>> example more close to home (and thus less likely to be accidentally
>>>> broken).
>>>>
>>>> [1] https://lore.kernel.org/linux-ext4/YCNF4yP1dB97zzwD@mit.edu/
>>>>
>>>> Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
>>>
>>> Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
>>>
>>
>> Should this be captured in  documentation. Especially since this
>> is file is .* file.
>>
>> Do you want to include doc in this patch? Might be better that way.
> 
> It definitely should be documented, yes.
> The only real example hadn't landed yet when I sent this patch
> (fs/ext4/.kunitconfig was going in through the ext4 tree), but now
> it's in linus/master.
> 
> There's still some uncertainties about what best practices for this
> feature should be, i.e.
> * how granular should these be?
> * how should configs in parent dirs be handled? Should they be
> supersets of all the subdirs?
>      * E.g. should fs/.kunitconfig be a superset of
> fs/ext4/.kunitconfig and any other hypothetical subdir configs?
>      * Should we wait on saying "you should do this" until we have
> "import" statements/other mechanisms to make this less manual?
> * how should we handle non-UML tests, like the KASAN tests?
>    * ideally, kunit.py run will eventually support running tests on x86
> (using qemu)
> 
> If it's fine with you, I was hoping to come back and add a section to
> kunit/start.rst when we've had some of those questions more figured
> out.
> 

Sound good. I will apply this patch and you can document later.

thanks,
-- Shuah