K 10
svn:author
V 5
sephe
K 8
svn:date
V 27
2016-05-18T03:28:51.145787Z
K 7
svn:log
V 241
hyperv/vmbus: Use atomic swap and flsl to process event flags

Greatly reduce the locked instructions and reduce number of inner loops.

MFC after:	1 week
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D6404

END