io_uring/notif: add constant for ubuf_info flags

Add a constant IO_NOTIF_UBUF_FLAGS for struct ubuf_info flags that
notifications use. That should minimise merge conflicts for planned
changes touching both io_uring and net at the same time.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/notif.c

@@ -79,7 +79,7 @@ struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx)
 	notif->io_task_work.func = io_req_task_complete;
 
 	nd = io_notif_to_data(notif);
-	nd->uarg.flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN;
+	nd->uarg.flags = IO_NOTIF_UBUF_FLAGS;
 	nd->uarg.callback = io_tx_ubuf_callback;
 	refcount_set(&nd->uarg.refcnt, 1);
 	return notif;

io_uring/notif.h

@@ -7,6 +7,7 @@
 
 #include "rsrc.h"
 
+#define IO_NOTIF_UBUF_FLAGS	(SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN)
 #define IO_NOTIF_SPLICE_BATCH	32
 
 struct io_notif_data {