return_handler
unsigned long return_handler = (unsigned long)dereference_kernel_function_descriptor(return_to_handler);
} while (ret_stack && ret_stack->ret == return_handler);
unsigned long return_handler = (unsigned long)dereference_kernel_function_descriptor(return_to_handler);
if (ret != return_handler)
ret_stack->ret != return_handler) {
.handler = return_handler,