memset_io
memset_io(ptr, 0, size);
memset_io(ptr, 0, size);
memset_io(info->screen_base, 0, info->screen_size);
memset_io(info->screen_base, 0, info->screen_size);
memset_io(overlay->regs, 0, sizeof(struct overlay_registers));
memset_io(rbo->kptr, 0x0, radeon_bo_size(rbo));
memset_io((void __iomem *)ptr, 0, size);
memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);