Re: [PATCH 4/4 V6] workqueue: Allow modifying low level unbound workqueue cpumask

From: Tejun Heo
Date: Mon Apr 06 2015 - 11:53:24 EST

On Thu, Apr 02, 2015 at 07:14:42PM +0800, Lai Jiangshan wrote:
> /* make a copy of @attrs and sanitize it */
> copy_workqueue_attrs(new_attrs, attrs);
> - cpumask_and(new_attrs->cpumask, new_attrs->cpumask, wq_unbound_global_cpumask);
> + copy_workqueue_attrs(pwq_attrs, attrs);
> + cpumask_and(new_attrs->cpumask, new_attrs->cpumask, cpu_possible_mask);
> + cpumask_and(pwq_attrs->cpumask, pwq_attrs->cpumask, unbound_cpumask);

Hmmm... why do we need to keep track of both cpu_possible_mask and
unbound_cpumask? Can't we just make unbound_cpumask replace
cpu_possible_mask for unbound workqueues?


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