Comment 10 for bug 1827755

I tested it and it looks good:
root@ltc-boston25:/home/ubuntu/comp_selftest# insmod comp_selftest.ko
root@ltc-boston25:/home/ubuntu/comp_selftest# ./testit
root@ltc-boston25:/home/ubuntu/comp_selftest# dmesg |tail
[ 10.561010] audit: type=1400 audit(1561358069.720:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-helper" pid=3496 comm="apparmor_parser"
[ 10.561014] audit: type=1400 audit(1561358069.720:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/connman/scripts/dhclient-script" pid=3496 comm="apparmor_parser"
[ 920.103139] comp_selftest: loading out-of-tree module taints kernel.
[ 920.103358] comp_selftest: module verification failed: signature and/or required key missing - tainting kernel
[ 931.871741] compression self test starting
[ 931.871744] compressor: 842-nx
[ 931.871745] repeat: Y
[ 931.871745] threads: 16
[ 931.871747] offsets 0-0/1, 0-0/1, 0-0/1
[ 931.871749] lengths 10000-10000/1, 10000-10000/1, 10000-10000/1
root@ltc-boston25:/home/ubuntu/comp_selftest# cat /sys/kernel/debug/comp_selftest/status
^Creads 16 MBps: 47121/42300 peak 47786/47470 off 0/0/0 len 10000/10000/10000
root@ltc-boston25:/home/ubuntu/comp_selftest# cat /proc/version
Linux version 4.15.0-53-generic (buildd@bos02-ppc64el-009) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #57-Ubuntu SMP Thu Jun 13 09:28:40 UTC 2019
root@ltc-boston25:/home/ubuntu/comp_selftest#