[RFC PATCH] x86, numa: always initialize all possible nodes

[Dave Hansen]

On 1/24/19 6:17 AM, Michal Hocko wrote:
> and nr_cpus set to 4. The underlying reason is tha the device is bound
> to node 2 which doesn't have any memory and init_cpu_to_node only
> initializes memory-less nodes for possible cpus which nr_cpus restrics.
> This in turn means that proper zonelists are not allocated and the page
> allocator blows up.

This looks OK to me.

Could we add a few DEBUG_VM checks that *look* for these invalid
zonelists?  Or, would our existing list debugging have caught this?

Basically, is this bug also a sign that we need better debugging around
this?