workqueue: add workqueue_struct->pwqs list
Add workqueue_struct->pwqs list and chain all pool_workqueues belonging to a workqueue there. This will be used to implement generic pool_workqueue iteration and handle multiple pool_workqueues for the scheduled unbound pools with custom attributes. This patch doesn't introduce any visible behavior changes. Signed-off-by: NTejun Heo <tj@kernel.org> Reviewed-by: NLai Jiangshan <laijs@cn.fujitsu.com>
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