[PATCH] powerpc/topology: Update numa mask when cpu node mapping changes

[Srikar Dronamraju]

* Srikar Dronamraju <srikar at linux.vnet.ibm.com> [2018-10-10 09:54:46]:

> Commit 2ea626306810 ("powerpc/topology: Get topology for shared
> processors at boot") will update the cpu node topology for shared lpars
> on PowerVM.
> 
> However shared lpars on PowerVM also support VPHN and PRRN events.
> On receiving a VPHN, PRRN events, cpu to node mapping might change.
> 
> Scheduler maintains sched_domains_numa_masks[], which is currently not
> updated on cpu to node mapping changes. This can lead to machine
> regressions and performance regressions.

s/regressions and performance regressions./hangs or performance hit./

> 
> Fix numa_update_cpu_topology() to update sched_domains_numa_masks[].
> 

-- 
Thanks and Regards
Srikar Dronamraju