linux-kernel - Re: [PATCH v4 09/10] workqueue: Implement system-wide nr_active enforcement for unbound workqueues

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Date: Wed, 31 Jan 2024 21:52:02 +0000
From: Mark Brown <broonie@...nel.org>
To: Tejun Heo <tj@...nel.org>
Cc: Nathan Chancellor <nathan@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	linux-kernel@...r.kernel.org, Naohiro.Aota@....com,
	kernel-team@...a.com
Subject: Re: [PATCH v4 09/10] workqueue: Implement system-wide nr_active
 enforcement for unbound workqueues

On Tue, Jan 30, 2024 at 06:24:51PM -1000, Tejun Heo wrote:

> Ah, I see. How about the following?
> 
> Thanks.
> 
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 9221a4c57ae1..31c1373505d8 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -1510,7 +1510,7 @@ static void wq_update_node_max_active(struct workqueue_struct *wq, int off_cpu)
>  
>  	lockdep_assert_held(&wq->mutex);
>  
> -	if (!cpumask_test_cpu(off_cpu, effective))
> +	if (off_cpu >= 0 && !cpumask_test_cpu(off_cpu, effective))
>  		off_cpu = -1;

This commit was also breaking at91sam9g20ek (and still is in today's
-next), the fix here gets that booting again:

Tested-by: Mark Brown <broonie@...nel.org>

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