K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2019-12-30T20:30:31.866469Z
K 7
svn:log
V 554
Determine whether the MMU hardware is capable of updating a page table
entry's access flag and dirty state, and enable this feature when it's
available.

Ensure that we don't overlook a dirty state update that is concurrent
with a call to pmap_enter().  (Previously, all dirty state updates would
have occurred with the containing pmap's lock held, so a page table entry's
dirty state could not have changed while pmap_enter() held that same lock.)

Reviewed by:	andrew, markj
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D22907

END