tree 398214dc8ade88adeb82bffce6f72f11610e6ae2
parent 58a6e545154609fcc8e69ffa2b838d10a7a3d351
author Andrew Scull <ascull@google.com> 1574271086 +0000
committer Andrew Scull <ascull@google.com> 1574350162 +0000

Convert logically unmapped modes to unmapping.

If an address range is invalid and unowned, it holds no extra
information so can be replaced with an absent entry.

The mapping functions are sometimes used to unmap addresses, for example
during memory sharing. This change means the resulting state of the page
table is the same as though an unmapping function had been used.

This has the side effect of canonicalizing the state for an unmapped
entry.

Change-Id: I1ff35d1dffb9720d5a18c00cd223879fa91c4b24