linux-kernel - Re: [PATCH 03/33] memcg: Prepare to protect against concurrent isolated cpuset change

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Message-ID: <aU8gwjlVmRkMtPZT@slm.duckdns.org>
Date: Fri, 26 Dec 2025 13:56:50 -1000
From: Tejun Heo <tj@...nel.org>
To: Frederic Weisbecker <frederic@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Michal Koutný <mkoutny@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Chen Ridong <chenridong@...wei.com>,
	Danilo Krummrich <dakr@...nel.org>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Gabriele Monaco <gmonaco@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
	Jens Axboe <axboe@...nel.dk>, Johannes Weiner <hannes@...xchg.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Marco Crivellari <marco.crivellari@...e.com>,
	Michal Hocko <mhocko@...e.com>, Muchun Song <muchun.song@...ux.dev>,
	Paolo Abeni <pabeni@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>, Phil Auld <pauld@...hat.com>,
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	Roman Gushchin <roman.gushchin@...ux.dev>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
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	Thomas Gleixner <tglx@...utronix.de>,
	Vlastimil Babka <vbabka@...e.cz>, Waiman Long <longman@...hat.com>,
	Will Deacon <will@...nel.org>, cgroups@...r.kernel.org,
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	linux-mm@...ck.org, linux-pci@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 03/33] memcg: Prepare to protect against concurrent
 isolated cpuset change

On Wed, Dec 24, 2025 at 02:44:50PM +0100, Frederic Weisbecker wrote:
> +static void schedule_drain_work(int cpu, struct work_struct *work)
> +{
> +	guard(rcu)();
> +	if (!cpu_is_isolated(cpu))
> +		schedule_work_on(cpu, work);
> +}

As the sync rules aren't trivial, it'd be nice to have some comment
explaining what's going on.

Thanks.

-- 
tejun