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Date: Wed, 5 Nov 2025 06:19:02 -1000
From: Tejun Heo <tj@kernel.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Calvin Owens <calvin@wbinvd.org>, linux-kernel@vger.kernel.org,
	Dan Schatzberg <dschatzberg@meta.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Michal =?iso-8859-1?Q?Koutn=FD?= <mkoutny@suse.com>,
	Clark Williams <clrkwllms@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>, cgroups@vger.kernel.org,
	linux-rt-devel@lists.linux.dev
Subject: Re: [PATCH cgroup/for-6.19 1/2] cgroup: Convert css_set_lock from
 spinlock_t to raw_spinlock_t
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References: <20251104181114.489391-1-calvin@wbinvd.org>
 <d03d2a6e0d0a09e9da6a54370f253c00@kernel.org>
 <20251105073009.xNtOAM_u@linutronix.de>
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In-Reply-To: <20251105073009.xNtOAM_u@linutronix.de>

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