Hi Vincent.
> + if (rb_resize_disabled(buffer, cpu_id)) {
> + err = -EBUSY;
> + goto out_err_unlock;
> + }
For a single CPU, this now happens before the nr_pages == cpu_buffer->nr_pages
early exit, so writing the same size to per_cpu/cpuN/buffer_size_kb on a
mapped or persistent instance CPU fails with EBUSY instead of succeeding.
Intended ?
> Additionally, remove the unnecessary cpumask_test_cpu in
> ring_buffer_subbuf_order_set().
The install loop still has one.
Otherwise removing the second check is fine, the hotplug window is
covered by the cpus_read_lock() patch I sent separately.
Cheers.
