From: Lai Jiangshan <laijs@cn.fujitsu.com>
Date: Tue, 19 May 2015 10:03:47 +0000 (+0800)
Subject: workqueue: separate out and refactor the locking of applying attrs
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~115^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a0111cf6710bd1b4145ef313d3f4772602af051b;p=pandora-kernel.git

workqueue: separate out and refactor the locking of applying attrs

Applying attrs requires two locks: get_online_cpus() and wq_pool_mutex,
and this code is duplicated at two places (apply_workqueue_attrs() and
workqueue_set_unbound_cpumask()).  So we separate out this locking
code into apply_wqattrs_[un]lock() and do a minor refactor on
apply_workqueue_attrs().

The apply_wqattrs_[un]lock() will be also used on later patch for
ensuring attrs changes are properly synchronized.

tj: minor updates to comments

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