pin_args
static int pin_pages(pin_args *args, void *buffer, size_t size)
static void unpin_pages(pin_args *args)
pin_args args = {};
pin_args pin_args = {};
if (pin_pages(&pin_args, gopts->area_dst, gopts->page_size)) {
unpin_pages(&pin_args);
unpin_pages(&pin_args);