workqueue: implement current_is_workqueue_rescuer()
authorTejun Heo <tj@kernel.org>
Wed, 13 Mar 2013 00:41:37 +0000 (17:41 -0700)
committerTejun Heo <tj@kernel.org>
Wed, 13 Mar 2013 00:42:01 +0000 (17:42 -0700)
Implement a function which queries whether it currently is running off
a workqueue rescuer.  This will be used to convert writeback to
workqueue.

Signed-off-by: Tejun Heo <tj@kernel.org>

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