From: Tejun Heo <tj@kernel.org>
Date: Tue, 12 Mar 2013 18:30:03 +0000 (-0700)
Subject: workqueue: drop WQ_RESCUER and test workqueue->rescuer for NULL instead
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~125^2~60
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=493008a8e475771a2126e0ce95a73e35b371d277;p=pandora-kernel.git

workqueue: drop WQ_RESCUER and test workqueue->rescuer for NULL instead

WQ_RESCUER is superflous.  WQ_MEM_RECLAIM indicates that the user
wants a rescuer and testing wq->rescuer for NULL can answer whether a
given workqueue has a rescuer or not.  Drop WQ_RESCUER and test
wq->rescuer directly.

This will help simplifying __alloc_workqueue_key() failure path by
allowing it to use destroy_workqueue() on a partially constructed
workqueue, which in turn will help implementing dynamic management of
pool_workqueues.

While at it, clear wq->rescuer after freeing it in
destroy_workqueue().  This is a precaution as scheduled changes will
make destruction more complex.

This patch doesn't introduce any functional changes.

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