[PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware

[Peter Zijlstra]

On Tue, Sep 24, 2019 at 03:19:39PM +0200, Michal Hocko wrote:

> > The below would get rid of the PMU and workqueue warnings with no
> > side-effects (the device isn't used for anything except sysfs).
> 
> Hardcoding to 0 is simply wrong, if the node0 is cpuless for example...

It doesn't matter.... that 0 is _never_ used. These are fake devices,
and all we care about is getting rid of that error.

If it makes you feel better we can make it -2 and have dev_to_node()
WARN if it ever sees one.