kernel: workqueue: clarify wq_worker_last_func() caller requirements

This function can only be called safely from very specific scheduler
contexts.  Document those.

Link: http://lkml.kernel.org/r/20190206150528.31198-1-hannes@cmpxchg.org


Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Change-Id: Iba9616c0193affb09f04daa59efb5a76f8d8f637
Git-commit: 4b0470027528ba98f9617f4ceba328de71d2fe49
Git-repo: https://source.codeaurora.org/quic/la/kernel/msm


Signed-off-by: Patrick Daly <pdaly@codeaurora.org>