linux-kernel - Re: [PATCH 0/7] Add wq_online_cpumask and remove cpus_read_lock() from apply_wqattrs

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Message-ID: <ZpASZbR_bYzYEKcX@slm.duckdns.org>
Date: Thu, 11 Jul 2024 07:12:05 -1000
From: Tejun Heo <tj@...nel.org>
To: Lai Jiangshan <jiangshanlai@...il.com>
Cc: linux-kernel@...r.kernel.org,
	Lai Jiangshan <jiangshan.ljs@...group.com>
Subject: Re: [PATCH 0/7] Add wq_online_cpumask and remove cpus_read_lock()
 from apply_wqattrs_lock()

On Thu, Jul 11, 2024 at 04:35:40PM +0800, Lai Jiangshan wrote:
> From: Lai Jiangshan <jiangshan.ljs@...group.com>
> 
> The new wq_online_mask mirrors the cpu_online_mask except during
> hotplugging; specifically, it differs between the hotplugging stages
> of workqueue_offline_cpu() and workqueue_online_cpu(), during which
> the transitioning CPU is not represented in the mask.
> 
> With wq_online_cpumask, cpus_read_lock() is unneeded for wqattrs changes.
> 
> 
> Lai Jiangshan (7):
>   workqueue: Add wq_online_cpumask
>   workqueue: Simplify wq_calc_pod_cpumask() with wq_online_cpumask
>   workqueue: Remove cpus_read_lock() from apply_wqattrs_lock()
>   workqueue: Remove the unneeded cpumask empty check in
>     wq_calc_pod_cpumask()
>   workqueue: Remove the argument @cpu_going_down from
>     wq_calc_pod_cpumask()
>   workqueue: Remove the arguments @hotplug_cpu and @online from
>     wq_update_pod()
>   workqueue: Rename wq_update_pod() to unbound_wq_update_pwq()

Applied 1-7 to wq/for-6.11. I updated a changelog to clarify why the change
is needed.

Thanks.

-- 
tejun