linux-kernel - Re: [PATCH v3 1/4] kunit: Always run cleanup from a test kthread

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Date:   Tue, 25 Apr 2023 17:47:11 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     David Gow <davidgow@...gle.com>
Cc:     Benjamin Berg <benjamin@...solutions.net>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Rae Moar <rmoar@...gle.com>,
        Daniel Latypov <dlatypov@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>, kunit-dev@...glegroups.com,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sadiya Kazi <sadiyakazi@...gle.com>
Subject: Re: [PATCH v3 1/4] kunit: Always run cleanup from a test kthread

On Fri, Apr 21, 2023 at 12:02:15PM +0800, David Gow wrote:
> KUnit tests run in a kthread, with the current->kunit_test pointer set
> to the test's context. This allows the kunit_get_current_test() and
> kunit_fail_current_test() macros to work. Normally, this pointer is
> still valid during test shutdown (i.e., the suite->exit function, and
> any resource cleanup). However, if the test has exited early (e.g., due
> to a failed assertion), the cleanup is done in the parent KUnit thread,
> which does not have an active context.
> 
> Instead, in the event test terminates early, run the test exit and
> cleanup from a new 'cleanup' kthread, which sets current->kunit_test,
> and better isolates the rest of KUnit from issues which arise in test
> cleanup.
> 
> If a test cleanup function itself aborts (e.g., due to an assertion
> failing), there will be no further attempts to clean up: an error will
> be logged and the test failed. For example:
> 	 # example_simple_test: test aborted during cleanup. continuing without cleaning up
> 
> This should also make it easier to get access to the KUnit context,
> particularly from within resource cleanup functions, which may, for
> example, need access to data in test->priv.
> 
> Signed-off-by: David Gow <davidgow@...gle.com>

Thanks for doing this. I've tested it with an action that needs the test
priv pointer, and it works as expected

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

Thanks!
Maxime

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