[PATCH 1/1] blk-mq: map all HWQ also in hyperthreaded system

[Sagi Grimberg]

>>> +static int cpu_to_queue_index(unsigned int nr_queues, const int cpu,
>>> +                  const struct cpumask *online_mask)
>>>   {
>>> -    return cpu * nr_queues / nr_cpus;
>>> +    /*
>>> +     * Non online CPU will be mapped to queue index 0.
>>> +     */
>>> +    if (!cpumask_test_cpu(cpu, online_mask))
>>> +        return 0;
>>
>> Why not map offline cpus to what they would've map to if they were
>> online?
> 
> I didn't change logic for offline cpu's.
> Should it be done in this patch ?

The patch clearly treats offline cpus differently, maps them
to queue 0.