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The purpose of these checks is to ensure that the address of the
next-level page table page is valid, since nothing is synchronizing with
a concurrent update of the large map and large map PTPs are freed to the
system. However, if PG_PS is set, there is no next level.
Reported by: rpokala
Reviewed by: kib
Tested by: rpokala
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D28922
(cherry picked from commit
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