>> 	PMAP_PALIGN	Request page alignment.  The returned region will
>> 			be page-aligned.
> Regions returned by mmap are *always* page aligned.

...at present.  But is that part of mmap()'s interface contract, or is
it an accident of the implementation?

If it's part of the interface contact, it should be documented; if not,
the above is not, IMO, an appropriate response to the proposed flag.

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