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There's no reason to make these trivial wrappers full (exported)
functions.  Inline the followings.

 queue_work()
 queue_delayed_work()
 mod_delayed_work()
 schedule_work_on()
 schedule_work()
 schedule_delayed_work_on()
 schedule_delayed_work()
 keventd_up()
Signed-off-by: Tejun Heo <tj@kernel.org>