Looks like this patch landed in v4.3-rc1:
commit 88c9281a9fba67636ab26c1fd6afbc78a632374f Author: Vitaly Kuznetsov <email address hidden> Date: Wed Aug 19 09:54:24 2015 -0700
x86/hyperv: Mark the Hyper-V TSC as unstable
Looks like this patch landed in v4.3-rc1:
commit 88c9281a9fba676 36ab26c1fd6afbc 78a632374f
Author: Vitaly Kuznetsov <email address hidden>
Date: Wed Aug 19 09:54:24 2015 -0700
x86/hyperv: Mark the Hyper-V TSC as unstable