linux-kernel - Re: [PATCH v2] kunit: tool: reconfigure when the used kunitconfig changes

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Date:   Tue, 7 Dec 2021 17:49:38 -0500
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Daniel Latypov <dlatypov@...gle.com>
Cc:     davidgow@...gle.com, linux-kernel@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        skhan@...uxfoundation.org
Subject: Re: [PATCH v2] kunit: tool: reconfigure when the used kunitconfig changes

On Fri, Nov 19, 2021 at 6:23 PM Daniel Latypov <dlatypov@...gle.com> wrote:
>
> Problem: currently, if you remove something from your kunitconfig,
> kunit.py will not regenerate the .config file.
> The same thing happens if you did --kunitconfig_add=CONFIG_KASAN=y [1]
> and then ran again without it. Your new run will still have KASAN.
>
> The reason is that kunit.py won't regenerate the .config file if it's a
> superset of the kunitconfig. This speeds it up a bit for iterating.
>
> This patch adds an additional check that forces kunit.py to regenerate
> the .config file if the current kunitconfig doesn't match the previous
> one.
>
> What this means:
> * deleting entries from .kunitconfig works as one would expect
> * dropping  a --kunitconfig_add also triggers a rebuild
> * you can still edit .config directly to turn on new options
>
> We implement this by creating a `last_used_kunitconfig` file in the
> build directory (so .kunit, by default) after we generate the .config.
> When comparing the kconfigs, we compare python sets, so duplicates and
> permutations don't trip us up.
>
> The majority of this patch is adding unit tests for the existing logic
> and for the new case where `last_used_kunitconfig` differs.
>
> [1] https://lore.kernel.org/linux-kselftest/20211106013058.2621799-2-dlatypov@google.com/
>
> Signed-off-by: Daniel Latypov <dlatypov@...gle.com>

When you first presented this, I wasn't a huge fan, but you convinced
me. I think the only reason I didn't initially like this is because of
how used-to kunit_tool's eccentricities I have gotten.

Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>