From Fedora Project Wiki

Kernel

The Fedora 22 distribution is powered by Linux kernel 4.0 RC1.

  • According to Linus Torvalds’ notes, it is a fairly small release, but not much smaller than the usual RC versions

Features

  • Various vm cleanups, and the unification of the PROTNONE and NUMA handling for page tables.
  • The final release of Linux kernel 4.0 will also include the highly anticipated live patching infrastructure.