linux-kernel - Re: [PATCH v1 0/3] kunit: Deferred action helpers

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Date:   Wed, 26 Apr 2023 14:51:50 +0800
From:   David Gow <davidgow@...gle.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        Stephen Boyd <sboyd@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Daniel Latypov <dlatypov@...gle.com>,
        Rae Moar <rmoar@...gle.com>,
        Benjamin Berg <benjamin@...solutions.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Jonathan Cameron <jic23@...nel.org>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com
Subject: Re: [PATCH v1 0/3] kunit: Deferred action helpers

On Tue, 25 Apr 2023 at 23:23, Maxime Ripard <maxime@...no.tech> wrote:
>
> Hi,
>
> On Fri, Apr 21, 2023 at 04:42:23PM +0800, David Gow wrote:
> > This is v1 of the KUnit deferred actions API, which implements an
> > equivalent of devm_add_action[1] on top of KUnit managed resources. This
> > provides a simple way of scheduling a function to run when the test
> > terminates (whether successfully, or with an error). It's therefore very
> > useful for freeing resources, or otherwise cleaning up.
> >
> > The notable changes since RFCv2[2] are:
> > - Got rid of the 'cancellation token' concept. It was overcomplicated,
> >   and we can add it back if we need to.
> > - kunit_add_action() therefore now returns 0 on success, and an error
> >   otherwise (like devm_add_action()). Though you may wish to use:
> > - Added kunit_add_action_or_reset(), which will call the deferred
> >   function if an error occurs. (See devm_add_action_or_reset()). This
> >   also returns an error on failure, which can be asserted safely.
> > - Got rid of the function pointer typedef. Personally, I liked it, but
> >   it's more typedef-y than most kernel code.
> > - Got rid of the 'internal_gfp' argument: all internal state is now
> >   allocated with GFP_KERNEL. The main KUnit resource API can be used
> >   instead if this doesn't work for your use-case.
> >
> > I'd love to hear any further thoughts!
>
> I've converted the KMS kunit tests to use that API when relevant, and
> it works like a charm and is super usable, thanks so much.

Nice! I'm glad it's working well.
>
> One improvement we could do as a second step is to provide a
> kunit_action_t type or something to make casting kfree-like functions
> easier, but it's already great overall.

I had that in an earlier version and got rid of it to better match
what devm_* was doing, but I personally agree that it's nice to have.
I'll add it back in the next version.

> Reviewed-by: Maxime Ripard <maxime@...no.tech>
> Tested-by: Maxime Ripard <maxime@...no.tech>


Cheers,
-- David

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