commit 420c0ddb1f205a3511b766d0dfee2cc87ed9dae0
author Tejun Heo <tj@kernel.org> Tue Mar 12 11:29:59 2013 -0700
committer Tejun Heo <tj@kernel.org> Tue Mar 12 11:29:59 2013 -0700
tree b40f69b265def3d67d2ea67b06584bc2e7437678
parent d84ff0512f1bfc0d8c864efadb4523fce68919cc

workqueue: remove workqueue_struct->pool_wq.single

workqueue->pool_wq union is used to point either to percpu pwqs
(pool_workqueues) or single unbound pwq.  As the first pwq can be
accessed via workqueue->pwqs list, there's no reason for the single
pointer anymore.

Use list_first_entry(workqueue->pwqs) to access the unbound pwq and
drop workqueue->pool_wq.single pointer and the pool_wq union.  It
simplifies the code and eases implementing multiple unbound pools w/
custom attributes.

This patch doesn't introduce any visible behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>