Clear PGA_WRITEABLE in riscv's pmap_remove_l3().
pmap_remove_l3() may remove the last mapping of a page, in which case
it must clear PGA_WRITEABLE.
Reported by: Jenkins, via lwhsu
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Clear PGA_WRITEABLE in riscv's pmap_remove_l3(). Tags None Referenced Files None Subscribers None
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