linux-kernel - Re: [PATCH v1 2/2] serial: 8250_dma: add parameter to queue work on specific cpu

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Message-ID: <aPkIUa73Xfr8NA-q@slm.duckdns.org>
Date: Wed, 22 Oct 2025 06:37:37 -1000
From: Tejun Heo <tj@...nel.org>
To: Xin Zhao <jackzxcui1989@....com>
Cc: gregkh@...uxfoundation.org, hch@...radead.org, jirislaby@...nel.org,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v1 2/2] serial: 8250_dma: add parameter to queue work on
 specific cpu

On Wed, Oct 22, 2025 at 10:47:07PM +0800, Xin Zhao wrote:
> Considering the current situation is still limited to the RT-Linux scenario, if
> possible, I will add the logic to create this workqueue only when CONFIG_PREEMPT_RT
> is enabled in the next patch. By setting WQ_SYS, it will allow user space to dynamically
> modify it. Additionally, in tty_flip_buffer_push, I will check if a private workqueue
> has been created; if so, I will use the private workqueue to queue the work task.

Creating a workqueue isn't that expensive. Might as well just always create
a dedicated workqueue.

Thanks.

-- 
tejun