Mark Johnston 407b6a4e44 Use ATTR_DBM even when hardware dirty bit management is not enabled.
The ARMv8 reference manual only states that the bit is reserved in
this case; following Linux's example, use it instead of a
software-defined bit for the purpose of indicating that a managed
mapping is writable.

Reviewed by:	alc, andrew
MFC after:	r350004
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D21121
2019-08-01 22:48:06 +00:00
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