I also tested the xenial GA kernel:
# uname -a Linux 1604 4.4.0-116-generic #140~lp1751994 SMP Thu Mar 8 15:31:31 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux
# dmesg | grep rfi [ 0.000000] rfi-flush: Using fallback displacement flush [ 0.000000] rfi-flush: patched 10 locations
I also tested the xenial GA kernel:
# uname -a
Linux 1604 4.4.0-116-generic #140~lp1751994 SMP Thu Mar 8 15:31:31 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux
# dmesg | grep rfi
[ 0.000000] rfi-flush: Using fallback displacement flush
[ 0.000000] rfi-flush: patched 10 locations