hotplug_state_string
hotplug_state_string(((state_transition_t *)arg)->begin),
hotplug_state_string(((state_transition_t *)arg)->end));
hotplug_state_string(lrp->strans.begin),
hotplug_state_string(lrp->strans.end));
extern const char *hotplug_state_string(hotplug_state_t state);
hotplug_state_string(oldstate),
hotplug_state_string(newstate));
hotplug_state_string(oldstate),
hotplug_state_string(newstate),
hotplug_state_string(diskp->state),