Nathan Lynch <nath...@linux.ibm.com> writes:
> During LPAR migration, cpu hotplug and migration operations can
> interleave like so:
>
> cd /sys/devices/system/cpu/cpu7/ | drmgr -m -c pmig -p pre \
> echo 0 > online | -s 0xd7a884f83d830e6d -t 19 \
> echo 1 > online | -n -d 1 5
> ---------------------------------+-------------------------------------------
> online_store() { |
> device_offline() { |
> cpu_subsys_offline() { |
> cpu_down(7); |
> } |
> dev->offline = true; |
> } | migration_store() {
> } | rtas_ibm_suspend_me() {
> | rtas_online_cpus_mask() {
> | cpu_up(7);
> | }
> | cpu_hotplug_disable();
> | on_each_cpu(rtas_percpu_suspend_me());
> | cpu_hotplug_enable();
> online_store() { |
> device_online() { |
> cpu_subsys_online() { |
> cpu_up(7); |
> } |
> dev->offline = false; |
> } | rtas_offline_cpus_mask() {
> } | rtas_cpu_state_change_mask() {
> | cpu_down(7);
> | }
> | }
> | }
> | }
Actually I think this isn't a correct depiction of the race. I'll
rewrite and resend.
