linux-kernel - Re: [PATCH] i3c: master: add WQ_PERCPU to alloc

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Message-ID: <20251107222830.oPfVHd-_@linutronix.de>
Date: Fri, 7 Nov 2025 23:28:30 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Frank Li <Frank.li@....com>
Cc: Marco Crivellari <marco.crivellari@...e.com>,
	linux-kernel@...r.kernel.org, linux-i3c@...ts.infradead.org,
	Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Michal Hocko <mhocko@...e.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [PATCH] i3c: master: add WQ_PERCPU to alloc_workqueue users

On 2025-11-07 16:00:06 [-0500], Frank Li wrote:
> > diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> > index d946db75df70..519b98c37ac7 100644
> > --- a/drivers/i3c/master.c
> > +++ b/drivers/i3c/master.c
> > @@ -2925,7 +2925,7 @@ int i3c_master_register(struct i3c_master_controller *master,
> >  	if (ret)
> >  		goto err_put_dev;
> >
> > -	master->wq = alloc_workqueue("%s", 0, 0, dev_name(parent));
> > +	master->wq = alloc_workqueue("%s", WQ_PERCPU, 0, dev_name(parent));
> 
> Maybe off topic, I think it is not neccesary to create wq for IBI at all.
> it can directly use system_bh_wq, or other wq.

Do you really meant system_bh_wq or would system_unbound_wq do the job?
The _bh_ one would imply softirq usage, I don't think you want that.

> Frank

Sebastian