37657ad5fb
Doing so ensures that all threads sharing the pmap have a consistent view of the mapping. This fixes the problem described in the commit log message for r329254 without the overhead of an extra fault in the common case. (Once the riscv pmap_enter() implementation is similarly modified, the workaround added in r329254 can be removed, reducing the overhead of CoW faults.) See also r335784 for amd64. The mips implementation of pmap_enter() already reused the PV entry from the old mapping. Reviewed by: kib, markj MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D16199
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