int cpu;
        BUG_ON(counter > NMI_MAX_COUNTER_BITS);
        for_each_possible_cpu (cpu) {
-               if (test_bit(counter, &per_cpu(perfctr_nmi_owner, cpu)))
+               if (test_bit(counter, &per_cpu(perfctr_nmi_owner, cpu)[0]))
                        return 0;
        }
        return 1;
        BUG_ON(counter > NMI_MAX_COUNTER_BITS);
 
        for_each_possible_cpu (cpu) {
-               if (test_bit(counter, &per_cpu(perfctr_nmi_owner, cpu)))
+               if (test_bit(counter, &per_cpu(perfctr_nmi_owner, cpu)[0]))
                        return 0;
        }
        return 1;
        counter = nmi_perfctr_msr_to_bit(msr);
        BUG_ON(counter > NMI_MAX_COUNTER_BITS);
 
-       if (!test_and_set_bit(counter, &per_cpu(perfctr_nmi_owner, cpu)))
+       if (!test_and_set_bit(counter, &per_cpu(perfctr_nmi_owner, cpu)[0]))
                return 1;
        return 0;
 }
        counter = nmi_perfctr_msr_to_bit(msr);
        BUG_ON(counter > NMI_MAX_COUNTER_BITS);
 
-       clear_bit(counter, &per_cpu(perfctr_nmi_owner, cpu));
+       clear_bit(counter, &per_cpu(perfctr_nmi_owner, cpu)[0]);
 }
 
 int reserve_perfctr_nmi(unsigned int msr)