[Question] Why we always pass NULL to drain_local_pages() in drain_local_pages_wq()?

[Wei Yang <richard.weiyang@xxxxxxxxx>]

Just took a look into the code of __offline_pages().

Even we may get the zone information, but it is never told to the WQ.
This will leads to the WQ drain pcp for all zones, even some of them are
not what we want to.

Curious about the background behind this.

-- 
Wei Yang
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