netdev - Re: [RFC net-next 1/2] selftests: drv-net: add ability to schedule cleanup with defer()

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Date: Wed, 26 Jun 2024 11:19:08 +0200
From: Petr Machata <petrm@...dia.com>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>
CC: Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>,
	<edumazet@...gle.com>, <pabeni@...hat.com>,
	<willemdebruijn.kernel@...il.com>, <leitao@...ian.org>, <petrm@...dia.com>,
	<davem@...emloft.net>
Subject: Re: [RFC net-next 1/2] selftests: drv-net: add ability to schedule
 cleanup with defer()


Przemek Kitszel <przemyslaw.kitszel@...el.com> writes:

> On 6/26/24 03:36, Jakub Kicinski wrote:
>
>> There is a global action queue, flushed by ksft_run(). We could support
>> function level defers too, I guess, but there's no immediate need..
>
> That would be a must have for general solution, would it require some
> boilerplate code at function level?

Presumably you'd need a per-function defer pool.

Which would be naturally modeled as a context manager, but I promised
myself I'd shut up about that.

>> +    def __enter__(self):
>> +        return self
>> +
>> +    def __exit__(self, ex_type, ex_value, ex_tb):
>> +        return self.exec()
>
> why do you need __enter__ and __exit__ if this is not a context
> manager / to-be-used-via-with?

But you could use it as a context manager.

    with defer(blah blah):
        do stuff
    # blah blah runs here

IMHO makes sense.