I'd like to submit and SRU for these four patches. However, the fourth patch attached to this bug seems to have changes since it landed in mainline.
The fourth patch posted in comment #4 does apply cleanly to Ubuntu 17.04. However, a cherry pick of 17ed4c8f81da from upstream 4.12-rc1 fails. The cherry pick fails because your patch has: + OFFSET(PACA_SIBLING_PACA_PTRS, paca_struct, thread_sibling_pacas); However, the mainline version has changed to: + DEFINE(PACA_SIBLING_PACA_PTRS, Did you perform a backport of the fourth patch in the version you attached? If so, we can apply it to 17.04 that way, but I just want to confirm. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1685792 Title: Offlined CPUs of a core fail to come up online on POWER9 DD1 (Ubuntu 17.04) Status in The Ubuntu-power-systems project: New Status in linux package in Ubuntu: In Progress Status in linux source package in Zesty: In Progress Bug description: == Comment: #0 - Ranjal G. Shenoy <ranjs...@in.ibm.com> - 2017-04-20 08:29:13 == Power9 DD1 has a hardware issue due to which in core whose all threads are offlined , when any of the CPUs are onlined, they come online with an incorrect PACA thereby resulting in a crash. The following fixes sent upstream need to applied to the 17.04 kernel to get CPU-Hotplug working correctly on a Power9 DD1 system. 1) powerpc/linux.git next, commit a7cd88da9704 ("powernv: Move CPU- Offline idle state invocation from smp.c to idle.c"). 2) powerpc/linux.git next, the commit 900612315788 ("powerpc/powernv/smp: Add busy-wait loop as fall back for CPU- Hotplug"). 3) powerpc/linux.git, commit f3b3f28493d932 ("powerpc/powernv/idle: Don't override default/deepest directly in kernel"). 4) powerpc/linux.git next, commit 17ed4c8f81da ("powerpc/powernv: Recover correct PACA on wakeup from a stop on P9 DD1"). These patches have been backported onto the 17.04 Kernel tagged Ubuntu-4.10.0-19.21. == Comment: #1 - Ranjal G. Shenoy <ranjs...@in.ibm.com> - 2017-04-20 08:29:54 == == Comment: #2 - Ranjal G. Shenoy <ranjs...@in.ibm.com> - 2017-04-20 08:30:37 == == Comment: #3 - Ranjal G. Shenoy <ranjs...@in.ibm.com> - 2017-04-20 08:31:15 == To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1685792/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
