Re: [PATCH v1 11/14] futex: Implement FUTEX2_NUMA

[Christoph Lameter (Ampere)]

On Mon, 31 Jul 2023, Peter Zijlstra wrote:

> > Is nr_node_ids guaranteed to be stable after init? It's marked
> > __read_mostly, but not __ro_after_init.
>
> AFAICT it is only ever written to in setup_nr_node_ids() and that is all
> __init code. So I'm thinking this could/should indeed be
> __ro_after_init. Esp. so since it is an exported variable.
>
> Mike?

Its stable and lots of other components depend on it like f.e. the size of 
cpumasks.