From: Tejun Heo <tj@kernel.org>
Date: Tue, 12 Mar 2013 18:30:00 +0000 (-0700)
Subject: workqueue: replace get_pwq() with explicit per_cpu_ptr() accesses and first_pwq()
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~125^2~70
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7fb98ea79cecb14fc1735544146be06fdb1944c3;p=pandora-kernel.git

workqueue: replace get_pwq() with explicit per_cpu_ptr() accesses and first_pwq()

get_pwq() takes @cpu, which can also be WORK_CPU_UNBOUND, and @wq and
returns the matching pwq (pool_workqueue).  We want to move away from
using @cpu for identifying pools and pwqs for unbound pools with
custom attributes and there is only one user - workqueue_congested() -
which makes use of the WQ_UNBOUND conditional in get_pwq().  All other
users already know whether they're dealing with a per-cpu or unbound
workqueue.

Replace get_pwq() with explicit per_cpu_ptr(wq->cpu_pwqs, cpu) for
per-cpu workqueues and first_pwq() for unbound ones, and open-code
WQ_UNBOUND conditional in workqueue_congested().

Note that this makes workqueue_congested() behave sligntly differently
when @cpu other than WORK_CPU_UNBOUND is specified.  It ignores @cpu
for unbound workqueues and always uses the first pwq instead of
oopsing.

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