* freebsd/12-stable/master:
  Stop accounting for MAX_KMAP when allocating UMA boot pages.
  MFC r364302, r364306: Remove the VM map zone.
  In 13-CURRENT, the linux rc script uses "nocover" mount option to avoid mounting required filesystems twice.  However, this option hasn't been MFC'd. Implement its functionality in a different way, by stating the mount point.