------- Comment From pavsu...@in.ibm.com 2018-06-22 01:58 EDT-------
I have downloaded  and installed the test kernel on the machine.

root@ltc-wspoon11:~/lp1777857# ls -l
total 48232
-rwxrwxrwx 1 root root  6153264 Jun 20 09:02 
linux-image-unsigned-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb
-rwxrwxrwx 1 root root 11767916 Jun 20 09:02 
linux-modules-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb
-rwxrwxrwx 1 root root 31445160 Jun 20 09:02 
linux-modules-extra-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb

root@ltc-wspoon11:~/lp1777857# dpkg -i 
linux-modules-extra-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb
(Reading database ... 203277 files and directories currently installed.)
Preparing to unpack 
linux-modules-extra-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb ...
Unpacking linux-modules-extra-4.15.0-23-generic (4.15.0-23.26~lp1777857) over 
(4.15.0-23.25) ...
Setting up linux-modules-extra-4.15.0-23-generic (4.15.0-23.26~lp1777857) ...
Processing triggers for linux-image-4.15.0-23-generic (4.15.0-23.25) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.15.0-23-generic
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
/etc/kernel/postinst.d/kdump-tools:
kdump-tools: Generating /var/lib/kdump/initrd.img-4.15.0-23-generic
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
/etc/kernel/postinst.d/zz-update-grub:
Generating grub configuration file ...
Found linux image: /boot/vmlinux-4.15.0-23-generic
Found initrd image: /boot/initrd.img-4.15.0-23-generic
Found linux image: /boot/vmlinux-4.15.0-22-generic
Found initrd image: /boot/initrd.img-4.15.0-22-generic
done

root@ltc-wspoon11:~/lp1777857# dpkg -i 
linux-modules-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb
(Reading database ... 203277 files and directories currently installed.)
Preparing to unpack 
linux-modules-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb ...
Unpacking linux-modules-4.15.0-23-generic (4.15.0-23.26~lp1777857) over 
(4.15.0-23.25) ...
Setting up linux-modules-4.15.0-23-generic (4.15.0-23.26~lp1777857) ...
Processing triggers for linux-image-4.15.0-23-generic (4.15.0-23.25) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.15.0-23-generic
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
/etc/kernel/postinst.d/kdump-tools:
kdump-tools: Generating /var/lib/kdump/initrd.img-4.15.0-23-generic
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
/etc/kernel/postinst.d/zz-update-grub:
Generating grub configuration file ...
Found linux image: /boot/vmlinux-4.15.0-23-generic
Found initrd image: /boot/initrd.img-4.15.0-23-generic
Found linux image: /boot/vmlinux-4.15.0-22-generic
Found initrd image: /boot/initrd.img-4.15.0-22-generic
done

root@ltc-wspoon11:~/lp1777857# dpkg -i --force-all 
linux-image-unsigned-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb
dpkg: regarding 
linux-image-unsigned-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb 
containing linux-image-unsigned-4.15.0-23-generic:
linux-image-unsigned-4.15.0-23-generic conflicts with 
linux-image-4.15.0-23-generic
linux-image-4.15.0-23-generic (version 4.15.0-23.25) is present and installed.

dpkg: warning: ignoring conflict, may proceed anyway!
dpkg: regarding 
linux-image-unsigned-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb 
containing linux-image-unsigned-4.15.0-23-generic:
linux-image-4.15.0-23-generic conflicts with 
linux-image-unsigned-4.15.0-23-generic
linux-image-unsigned-4.15.0-23-generic (version 4.15.0-23.26~lp1777857) is to 
be installed.

dpkg: warning: ignoring conflict, may proceed anyway!
(Reading database ... 203259 files and directories currently installed.)
Preparing to unpack 
linux-image-unsigned-4.15.0-23-generic_4.15.0-23.26~lp1777857_ppc64el.deb ...
Unpacking linux-image-unsigned-4.15.0-23-generic (4.15.0-23.26~lp1777857) ...
dpkg: warning: overriding problem because --force enabled:
dpkg: warning: trying to overwrite '/boot/vmlinux-4.15.0-23-generic', which is 
also in package linux-image-4.15.0-23-generic 4.15.0-23.25
Setting up linux-image-unsigned-4.15.0-23-generic (4.15.0-23.26~lp1777857) ...
Processing triggers for linux-image-4.15.0-23-generic (4.15.0-23.25) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.15.0-23-generic
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
/etc/kernel/postinst.d/kdump-tools:
kdump-tools: Generating /var/lib/kdump/initrd.img-4.15.0-23-generic
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
/etc/kernel/postinst.d/zz-update-grub:
Generating grub configuration file ...
Found linux image: /boot/vmlinux-4.15.0-23-generic
Found initrd image: /boot/initrd.img-4.15.0-23-generic
Found linux image: /boot/vmlinux-4.15.0-22-generic
Found initrd image: /boot/initrd.img-4.15.0-22-generic
done
Processing triggers for linux-image-unsigned-4.15.0-23-generic 
(4.15.0-23.26~lp1777857) ...

Then rebooted the Linux HOST to get to the new test kernel.

root@ltc-wspoon11:~# uname -a
Linux ltc-wspoon11 4.15.0-23-generic #26~lp1777857 SMP Wed Jun 20 13:55:21 UTC 
2018 ppc64le ppc64le ppc64le GNU/Linux

I have executed the hwclock RTC driver tests and not seeing any
rcu_sched messages in the dmesg.

So, with the test kernel the fixes are working fine.

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Title:
  [LTCTest][OPAL][OP920] INFO: rcu_sched self-detected stall on CPU

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