[linux-next] PPC Lpar fail to boot with error hid: module verification failed: signature and/or required key missing - tainting kernel

Hi,

Test : boot
Machine : Power 8 PowerVM LPAR
Kernel version : 4.12.0-rc2-next-20170524
Toolchain : gcc version 5.2.1
Config : attached

next-20170517 was last good version where we did not see the failure.
from next-20170519 to today's next-20170524, we see the problem
everyday.

Kernels fails to boot on PowerVM LPAR with these errors;

Freeing unused kernel memory: 4416K
This architecture does not have kernel memory protection.
Loading, please wait...
mount: mounting udev on /dev failed: Device or resource busy
W: devtmpfs not available, falling back to tmpfs for /dev
starting version 222
Begin: Loading essential drivers ... done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin:
Running /scripts/local-top ... done.
chvt: can't open console
Gave up waiting for root device.  Common problems:
 - Boot args (cat /proc/cmdline)
   - Check rootdelay= (did the system wait long enough?)
   - Check root= (did the system wait for the right device?)
 - Missing modules (cat /proc/modules; ls /dev)
chvt: can't open console
ALERT!  /dev/disk/by-uuid/3aee8de3-5b8f-4a89-9e89-108efe213983 does not
exist.  Dropping to a shell!
hid: module verification failed: signature and/or required key missing -
tainting kernel
hidraw: raw HID events driver (C) Jiri Kosina
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
Couldn't get a file descriptor referring to the console

(initramfs)

detail logs are attached.

-- 
Regard's

Abdul Haleem
IBM Linux Technology Centre