linux-kernel - Re: [PATCH cgroup/for-6.19 1/2] cgroup: Convert css_set_lock from spinlock_t to raw_spinlock

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Message-ID: <aQt49uB4lEDPqVYE@slm.duckdns.org>
Date: Wed, 5 Nov 2025 06:19:02 -1000
From: Tejun Heo <tj@...nel.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Calvin Owens <calvin@...nvd.org>, linux-kernel@...r.kernel.org,
	Dan Schatzberg <dschatzberg@...a.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>, cgroups@...r.kernel.org,
	linux-rt-devel@...ts.linux.dev
Subject: Re: [PATCH cgroup/for-6.19 1/2] cgroup: Convert css_set_lock from
 spinlock_t to raw_spinlock_t

On Wed, Nov 05, 2025 at 08:30:09AM +0100, Sebastian Andrzej Siewior wrote:
> This one has a kfree(link) and kfree takes spinlock_t so not working.
...
> 
> I am also a bit worried about all these list iterations which happen
> under the lock. There is no upper limit meaning the list can grow with
> limits affecting the time the lock is held.

Good points. Let me think of something else.

Thanks.

-- 
tejun