K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2016-10-11T18:09:37.955772Z
K 7
svn:log
V 439
When downgrading exclusively busied page to shared-busy state, wakeup
waiters.  Otherwise, owners of the shared-busy state are left blocked
and might get into a deadlock.

Note that the vm_page_busy_downgrade() function is not used in the
tree right now.

Reported and tested by:	pho (previous version)
Reviewed by:	alc, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D8195

END