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SubjectRe: [PATCH v6 3/5] sched: Enforce user requested affinity
On Thu, Aug 25, 2022 at 09:01:17PM -0400, Waiman Long wrote:

> @@ -9352,6 +9381,11 @@ int sched_cpu_activate(unsigned int cpu)
> sched_update_numa(cpu, true);
> sched_domains_numa_masks_set(cpu);
> cpuset_cpu_active();
> + /*
> + * Preallocated scratch cpumask
> + */
> + if (!rq->scratch_mask)
> + rq->scratch_mask = kmalloc(cpumask_size(), GFP_KERNEL);
> }

this is too late; I think you'll have to add a sched_cpu_prepare() and
simply fail the cpu-up when the allocation fails.

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