Received-SPF: pass (google.com: domain of linux-nfs+bounces-355-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) client-ip=2604:1380:40f1:3f00::1;
Date: Tue, 5 Dec 2023 21:44:03 -0800
From: Christoph Hellwig <hch@infradead.org>
To: Christian Brauner <brauner@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>, NeilBrown <neilb@suse.de>,
	Al Viro <viro@zeniv.linux.org.uk>, Oleg Nesterov <oleg@redhat.com>,
	Chuck Lever <chuck.lever@oracle.com>,
	Jeff Layton <jlayton@kernel.org>, Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-nfs@vger.kernel.org
Subject: Re: [PATCH 1/2] Allow a kthread to declare that it calls
 task_work_run()
Message-ID: <ZXAKI76NLlCHGQ7h@infradead.org>
References: <20231204014042.6754-1-neilb@suse.de>
 <20231204014042.6754-2-neilb@suse.de>
 <e9a1cfed-42e9-4174-bbb3-1a3680cf6a5c@kernel.dk>
 <170172377302.7109.11739406555273171485@noble.neil.brown.name>
 <a070b6bd-0092-405e-99d2-00002596c0bc@kernel.dk>
 <20231205-altbacken-umbesetzen-e5c0c021ab98@brauner>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20231205-altbacken-umbesetzen-e5c0c021ab98@brauner>

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?