XDRBUF_SPARSE_PAGES
req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
if ((xdr->flags & XDRBUF_SPARSE_PAGES) && *ppage == NULL) {
if (!(buf->flags & XDRBUF_SPARSE_PAGES))
if (unlikely(rqst->rq_rcv_buf.flags & XDRBUF_SPARSE_PAGES)) {
if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))