NO_HZ option is deprecated since some 3.x version
https://github.com/gentoo/gentoo/pull/4626
commit 67c474ad822b8c40640e65aceb1fe6dfbe6caa1f (HEAD -> master, origin/master, origin/HEAD) Author: Elias Probst <mail@eliasprobst.eu> AuthorDate: Sun May 14 13:03:35 2017 +0200 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Sun Jun 4 17:27:00 2017 +0200 sys-power/powertop: NO_HZ_IDLE replaces deprecated NO_HZ Kernel option Per docs, NO_HZ_IDLE has replaced old behavior of NO_HZ in 3.10. Bug: https://bugs.gentoo.org/575418 Closes: https://github.com/gentoo/gentoo/pull/4626 Package-Manager: Portage-2.3.5, Repoman-2.3.2