Re: [PATCH v2] sched/topology, cpuset: Account for housekeeping CPUs to avoid empty cpumasks

[Valentin Schneider]

On 04/11/2019 00:39, Valentin Schneider wrote:
> Michal noted that a cpuset's effective_cpus can be a non-empy mask, but
> because of the masking done with housekeeping_cpumask(HK_FLAG_DOMAIN)
> further down the line, we can still end up with an empty cpumask being
> passed down to partition_sched_domains_locked().
> 
> Do the proper thing and don't just check the mask is non-empty - check
> that its intersection with housekeeping_cpumask(HK_FLAG_DOMAIN) is
> non-empty.
> 
> Fixes: cd1cb3350561 ("sched/topology: Don't try to build empty sched domains")
> Reported-by: Michal Koutnà <mkoutny@xxxxxxxx>

Michal, could I nag you for a reviewed-by? I'd feel a bit more confident
with any sort of approval from folks who actually do use cpusets.

> Signed-off-by: Valentin Schneider <valentin.schneider@xxxxxxx>