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

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Date:   Wed, 26 Apr 2023 14:51:45 +0800
From:   David Gow <davidgow@...gle.com>
To:     Benjamin Berg <benjamin@...solutions.net>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Maxime Ripard <maxime@...no.tech>,
        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>,
        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 Mon, 24 Apr 2023 at 22:02, Benjamin Berg <benjamin@...solutions.net> wrote:
>
> Hi David,
>
> On Mon, 2023-04-24 at 14:32 +0200, Benjamin Berg wrote:
> > On Fri, 2023-04-21 at 16:42 +0800, 'David Gow' via KUnit Development 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 am happy with it as-is.
>
> Oh, wait. Nothing big, but I just noticed that the new API functions
> seem to not yet be exported using EXPORT_SYMBOL_GPL.

Ah, nice catch! I'll add those to the next version.

Cheers,
-- David

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