static int io_nop(struct io_kiocb *req)
{
	struct io_ring_ctx *ctx = req->ctx;

	if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
		return -EINVAL;

	io_cqring_add_event(req, 0);
	io_put_req(req);
	return 0;
}
static int io_nop(struct io_kiocb *req)
{
	struct io_ring_ctx *ctx = req->ctx;

	if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
		return -EINVAL;

	io_cqring_add_event(req, 0);
	io_put_req(req);
	return 0;
}