[powerpc/merge] System crash during cpu offline/online operation

[Sachin Sant]

I am observing system crash during a cpu offline/online operation
with latest merge branch code running in a PowerVM LPAR (P8 onwards)

# uname -r
5.10.0-rc7-01792-g244569c777ca
# ppc64_cpu --smt=1
[  244.205194] cpu 1 (hwid 1) Ready to die…
………
……...
[  247.015113] cpu 30 (hwid 30) Ready to die...
[  247.104973] cpu 31 (hwid 31) Ready to die…
# ppc64_cpu --smt=8

At this point the LPAR reboots instantly without any trace message.

IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM 
………..
………..
IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM 

          1 = SMS Menu                          5 = Default Boot List
          8 = Open Firmware Prompt              6 = Stored Boot List
          9 = Restricted Open Firmware Prompt

…….
…….

merge commit 9acd775e45 (based on rc6) was good. Mainline 5.10.0-rc7 also does
not exhibit this problem. 

Thanks
-Sachin