linux-kernel - Re: [PATCH v1] dmaengine: dmatest: Fix dmatest waiting less when interrupted

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Message-ID: <877c428yng.fsf@AUSNATLYNCH.amd.com>
Date: Wed, 2 Apr 2025 08:45:55 -0500
From: Nathan Lynch <nathan.lynch@....com>
To: Vinicius Costa Gomes <vinicius.gomes@...el.com>, Vinod Koul
	<vkoul@...nel.org>, <dmaengine@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <dave.jiang@...el.com>, <kristen.c.accardi@...el.com>, kernel test robot
	<oliver.sang@...el.com>
Subject: Re: [PATCH v1] dmaengine: dmatest: Fix dmatest waiting less when
 interrupted

Vinicius Costa Gomes <vinicius.gomes@...el.com> writes:
> Nathan Lynch <nathan.lynch@....com> writes:
>
>> Vinicius Costa Gomes <vinicius.gomes@...el.com> writes:
>>> Nathan Lynch <nathan.lynch@....com> writes:
>>>> dmatest_callback() employs wake_up_all(), which means this change
>>>> introduces no beneficial difference in the wakeup behavior. The dmatest
>>>> thread gets woken on receipt of the completion interrupt either way.
>>>>
>>>> And to reiterate, the change regresses the combination of dmatest and
>>>> the task freezer, which is a use case people have cared about,
>>>> apparently.
>>>>
>>>
>>> If this change in behavior causes a regression for others, glad to send
>>> a revert and find another solution.
>>
>> Thanks - yes it should be reverted or dropped IMO.
>
> Here's what I am thinking, I'll work on this a few days and see if I can
> find an alternative solution and send the revert together with the fix.
> If I can't find another solution in a few days, I'll propose the revert
> anyway.

Just checking on this - I see this regression is in Linus's master
branch now.