[mainline] [powerpc/powervm]Kernel OOPS while executing memory hotplug on Power8 baremetal

[vrbagal1]

Greetings!!!

Observing Kernel oops and machine reboots while executing memory hotplug 
test case, on Power8 Baremetal machine.

I see this is introduced some where between rc6 and 4.17.

Machine: Power 8 Baremetal(PowerNV)
Kernel Veriosn: Linux version 4.17.0-autotest
gcc Version: gcc version 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC))

Attached is the .config file and traces found.

Cheers.
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