Please run an exp-run to test the patch from the review in URL. I plan to commit this to HEAD so you would only need to run an exp-run against that. The kernel changes aren't really important (no functional change), so it would be sufficient to just build a new world to get the updated header for the exp-run.
Exp-run results: http://package18.nyi.freebsd.org/build.html?mastername=headamd64PR222516-default&build=2017-09-23_20h30m23s lang/python* fail to build and half of the ports tree was skipped due to those failures Failure logs: http://package18.nyi.freebsd.org/data/headamd64PR222516-default/2017-09-23_20h30m23s/logs/errors/python27-2.7.13_7.log http://package18.nyi.freebsd.org/data/headamd64PR222516-default/2017-09-23_20h30m23s/logs/errors/python34-3.4.7.log http://package18.nyi.freebsd.org/data/headamd64PR222516-default/2017-09-23_20h30m23s/logs/errors/python35-3.5.4.log http://package18.nyi.freebsd.org/data/headamd64PR222516-default/2017-09-23_20h30m23s/logs/errors/python36-3.6.2_1.log
reassign to submitter, please reassign to portmgr if you want a refreshed exp-run