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

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Date:   Fri, 21 Apr 2023 16:42:23 +0800
From:   David Gow <davidgow@...gle.com>
To:     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>,
        Benjamin Berg <benjamin@...solutions.net>
Cc:     David Gow <davidgow@...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: [PATCH v1 0/3] kunit: Deferred action helpers

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!

Cheers,
-- David

[1]: https://docs.kernel.org/driver-api/basics.html#c.devm_add_action
[2]: https://patchwork.kernel.org/project/linux-kselftest/list/?series=735720


David Gow (3):
  kunit: Add kunit_add_action() to defer a call until test exit
  kunit: executor_test: Use kunit_add_action()
  kunit: kmalloc_array: Use kunit_add_action()

 include/kunit/resource.h  | 76 +++++++++++++++++++++++++++++++
 include/kunit/test.h      | 10 ++++-
 lib/kunit/executor_test.c | 11 ++---
 lib/kunit/kunit-test.c    | 88 +++++++++++++++++++++++++++++++++++-
 lib/kunit/resource.c      | 95 +++++++++++++++++++++++++++++++++++++++
 lib/kunit/test.c          | 48 ++++----------------
 6 files changed, 279 insertions(+), 49 deletions(-)

-- 
2.40.0.634.g4ca3ef3211-goog