PAI_SAVE_AREA
free_page(PAI_SAVE_AREA(event));
PAI_SAVE_AREA(event) = get_zeroed_page(GFP_KERNEL);
if (!PAI_SAVE_AREA(event)) {
free_page(PAI_SAVE_AREA(event));
memcpy((void *)PAI_SAVE_AREA(event), cpump->area, pp->area_size);
memcpy((void *)PAI_SAVE_AREA(event), cpump->area, pp->area_size);
(unsigned long *)PAI_SAVE_AREA(event),