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author Tejun Heo <tj@kernel.org> 1284626909 +0200
committer Tejun Heo <tj@kernel.org> 1284911465 +0200

workqueue: implement flush[_delayed]_work_sync()

Implement flush[_delayed]_work_sync().  These are flush functions
which also make sure no CPU is still executing the target work from
earlier queueing instances.  These are similar to
cancel[_delayed]_work_sync() except that the target work item is
flushed instead of cancelled.

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