[PATCH v4 4/5] powerpc/numa: Early request for home node associativity

[Nathan Lynch]

Srikar Dronamraju <srikar at linux.vnet.ibm.com> writes:

> Currently the kernel detects if its running on a shared lpar platform
> and requests home node associativity before the scheduler sched_domains
> are setup. However between the time NUMA setup is initialized and the
> request for home node associativity, workqueue initializes its per node
> cpumask. The per node workqueue possible cpumask may turn invalid
> after home node associativity resulting in weird situations like
> workqueue possible cpumask being a subset of workqueue online cpumask.
>
> This can be fixed by requesting home node associativity earlier just
> before NUMA setup. However at the NUMA setup time, kernel may not be in
> a position to detect if its running on a shared lpar platform. So
> request for home node associativity and if the request fails, fallback
> on the device tree property.

Reviewed-by: Nathan Lynch <nathanl at linux.ibm.com>