[PATCH 00/18] remove extended cede offline mode and bogus topology update code

[Nathan Lynch]

Two major parts to this series:

1. Removal of the extended cede offline mode for CPUs as well as the
   partition suspend code which accommodates it by temporarily
   onlining all CPUs prior to suspending the LPAR. This solves some
   accounting problems, simplifies the pseries CPU hotplug code, and
   greatly uncomplicates the existing partition suspend code, easing
   a much-needed transition to the Linux suspend framework. The two
   patches which make up this part have been posted before:

   https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=180718

   and they are simply incorporated unchanged into the larger series
   here, with Gautham's Reviewed-by added to patch #1.

2. Removal of the long-disabled "topology update" code, most of which
   resides in mm/numa.c, but there are pieces in pseries and rtasd to
   excise as well. This code was an attempt to honor changes in a
   partition's NUMA properties arising from resource reassignments
   which occur as part of a migration, VPHN change, or a Dynamic
   Platform Optimizer operation. Its main technique is to remove and
   re-add affected processors and LMBs and hope in vain that the
   changes in cpu-node and physaddr-node relationships aren't
   disruptive. We want to provide user space with some indication that
   Linux's logical NUMA representation has become out of sync with the
   platform's assignments, but we need to get this unusable stuff out
   of the way before this code can sustain new features.

Nathan Lynch (18):
  powerpc/pseries: remove cede offline state for CPUs
  powerpc/rtas: don't online CPUs for partition suspend
  powerpc/numa: remove ability to enable topology updates
  powerpc/numa: remove unreachable topology update code
  powerpc/numa: make vphn_enabled, prrn_enabled flags const
  powerpc/numa: remove unreachable topology timer code
  powerpc/numa: remove unreachable topology workqueue code
  powerpc/numa: remove vphn_enabled and prrn_enabled internal flags
  powerpc/numa: stub out numa_update_cpu_topology()
  powerpc/numa: remove timed_topology_update()
  powerpc/numa: remove start/stop_topology_update()
  powerpc/rtasd: simplify handle_rtas_event(), emit message on events
  powerpc/numa: remove prrn_is_enabled()
  powerpc/numa: remove arch_update_cpu_topology
  powerpc/pseries: remove prrn special case from DT update path
  powerpc/pseries: remove memory "re-add" implementation
  powerpc/pseries: remove dlpar_cpu_readd()
  powerpc/pseries: remove obsolete memory hotplug DT notifier code

 Documentation/core-api/cpu_hotplug.rst        |   7 -
 arch/powerpc/include/asm/rtas.h               |   3 -
 arch/powerpc/include/asm/topology.h           |  27 -
 arch/powerpc/kernel/rtas.c                    | 122 +----
 arch/powerpc/kernel/rtasd.c                   |  28 +-
 arch/powerpc/mm/numa.c                        | 486 ------------------
 arch/powerpc/platforms/pseries/hotplug-cpu.c  | 189 +------
 .../platforms/pseries/hotplug-memory.c        | 107 +---
 arch/powerpc/platforms/pseries/mobility.c     |  31 --
 .../platforms/pseries/offline_states.h        |  38 --
 arch/powerpc/platforms/pseries/pmem.c         |   1 -
 arch/powerpc/platforms/pseries/smp.c          |  28 +-
 arch/powerpc/platforms/pseries/suspend.c      |  27 +-
 13 files changed, 22 insertions(+), 1072 deletions(-)
 delete mode 100644 arch/powerpc/platforms/pseries/offline_states.h

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2.25.4