linux-kernel - Re: [PATCH 1/2] Allow a kthread to declare that it calls task_work

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Message-ID: <ZXAKI76NLlCHGQ7h@infradead.org>
Date:   Tue, 5 Dec 2023 21:44:03 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, NeilBrown <neilb@...e.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Oleg Nesterov <oleg@...hat.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Jeff Layton <jlayton@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nfs@...r.kernel.org
Subject: Re: [PATCH 1/2] Allow a kthread to declare that it calls
 task_work_run()

On Tue, Dec 05, 2023 at 12:14:29PM +0100, Christian Brauner wrote:
> > For me, the more core of an export it is, the stronger the reason it
> > should be GPL. FWIW, I don't think exporting task_work functionality is
> > a good idea in the first place, but if there's a strong reason to do so,
> 
> Yeah, I'm not too fond of that part as well. I don't think we want to
> give modules the ability to mess with task work. This is just asking for
> trouble.

It just seems like a really bad idea.  At the same time it fixes a real
problem.  If we go a step back how could we fix it in a better way?
Do we even need the task_run based delay for file usage from kernel
threads?