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 11:38:42 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Petr Machata <petrm@...dia.com>
CC: Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>,
	<edumazet@...gle.com>, <pabeni@...hat.com>,
	<willemdebruijn.kernel@...il.com>, <leitao@...ian.org>, <davem@...emloft.net>
Subject: Re: [RFC net-next 1/2] selftests: drv-net: add ability to schedule
 cleanup with defer()

On 6/26/24 11:19, Petr Machata wrote:
> 
> 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.

oh, nice! agree!
Then this little part is "the general solution", with the rest
(global queue) added as a sugar layer for kselftests, to only
avoid inflating indentation levels, great