+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?
+ if (cpu < nr_queues) {
+ map[cpu] = cpu_to_queue_index(nr_queues, cpu, online_mask);
+ } else {
+ first_sibling = get_first_sibling(cpu);
+ if (first_sibling == cpu)
+ map[cpu] = cpu_to_queue_index(nr_queues, cpu, online_mask);
This seems to be the only reference to online_mask left (on each side of
the if statement. I think you can just not pass it and use
cpu_online_mask in cpu_to_queue_index.
