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Implement pmap_page_is_mapped() correctly on arm64 and riscv.

Description

Implement pmap_page_is_mapped() correctly on arm64 and riscv.

We must also check for large mappings. pmap_page_is_mapped() is
mostly used in assertions, so the problem was not very noticeable.

Reviewed by: alc
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D21824

Details

Provenance
markjAuthored on
Reviewer
alc
Differential Revision
D21824: Fix pmap_page_is_mapped() for arm64 and riscv.
Parents
rS352825: Allow the NFSv4.2 Copy operation to do a synchronous copy when
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