From: Jens Axboe <axboe@kernel.dk>
Date: Fri, 20 Sep 2024 05:38:01 +0000 (-0600)
Subject: io_uring: improve request linking trace
X-Git-Tag: v6.12-rc1~74^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=eed138d67d99312f07ed3bc326903b6808885571;p=thirdparty%2Fkernel%2Flinux.git

io_uring: improve request linking trace

Right now any link trace is listed as being linked after the head
request in the chain, but it's more useful to note explicitly which
request a given new request is chained to. Change the link trace to dump
the tail request so that chains are immediately apparent when looking at
traces.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 11c455b638a28..d306f566a944c 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2153,7 +2153,7 @@ static inline int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
 	 * conditions are true (normal request), then just queue it.
 	 */
 	if (unlikely(link->head)) {
-		trace_io_uring_link(req, link->head);
+		trace_io_uring_link(req, link->last);
 		link->last->link = req;
 		link->last = req;