Re: [PATCH] cpu-topology: warn if NUMA configurations conflicts with lower layer

[Valentin Schneider]

On 13/01/2020 14:49, Dietmar Eggemann wrote:
> LGTM. This code detects the issue in cpu_coregroup_mask(), which is the
> the cpumask function of the sched domain MC level struct
> sched_domain_topology_level of ARM64's (and other archs)
> default_topology[].
> I wonder how x86 copes with such a config error?
> Maybe they do it inside their cpu_coregroup_mask()?
> 
> 
> We could move validate_topology_spans() into the existing
> 
> for_each_cpu(i, cpu_map)
>     for_each_sd_topology(tl)
> 
> loop in build_sched_domains() saving some code?
> 

[...]

Yeah that should work. Folks might want to gate it under SCHED_DEBUG, but
that's another discussion.