> +static inline void intel_rdt_cpu_start(int cpu) > +{ > + struct intel_pqr_state *state = &per_cpu(pqr_state, cpu); > + > + state->closid = 0; > + mutex_lock(&rdt_group_mutex); > + if (rdt_cpumask_update(cpu)) > + smp_call_function_single(cpu, cbm_update_msrs, NULL, 1); > + mutex_unlock(&rdt_group_mutex);
what happens if cpu's with a cache_id not available at boot comes online?