mm: how to check for kernel pages

[Michal Hocko <mstsxfx@gmail.com>]

Hi,
is there any effective and fast way how to find out whether page
given by its page frame number is currenly used by (mapped by) kernel?

At the time of checking I can rely that such page:
	- is not buddy allocator page and also not on per CPU lists
	- is not compound page
	- is not reserved page
Because I can check that from struct page's flags.
I was thinking about using rmap code to find all ptes, but I don't know
whether it is not too complicated way.

Thanks for all hints.

Please add me to Cc, because I am not the list member.
Best regards.
-- 
Michal Hocko

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