FAILED: patch "[PATCH] blk-crypto: fix missing blktrace bio split events" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 06d712d297649f48ebf1381d19bd24e942813b37
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025101656-curdle-duration-949d@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 06d712d297649f48ebf1381d19bd24e942813b37 Mon Sep 17 00:00:00 2001
From: Yu Kuai <yukuai3@huawei.com>
Date: Wed, 10 Sep 2025 14:30:45 +0800
Subject: [PATCH] blk-crypto: fix missing blktrace bio split events

trace_block_split() is missing, resulting in blktrace inability to catch
BIO split events and making it harder to analyze the BIO sequence.

Cc: stable@vger.kernel.org
Fixes: 488f6682c832 ("block: blk-crypto-fallback for Inline Encryption")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-crypto-fallback.c b/block/blk-crypto-fallback.c
index dbc2d8784dab..27fa1ec4b264 100644
--- a/block/blk-crypto-fallback.c
+++ b/block/blk-crypto-fallback.c
@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/random.h>
 #include <linux/scatterlist.h>
+#include <trace/events/block.h>
 
 #include "blk-cgroup.h"
 #include "blk-crypto-internal.h"
@@ -230,7 +231,9 @@ static bool blk_crypto_fallback_split_bio_if_needed(struct bio **bio_ptr)
 			bio->bi_status = BLK_STS_RESOURCE;
 			return false;
 		}
+
 		bio_chain(split_bio, bio);
+		trace_block_split(split_bio, bio->bi_iter.bi_sector);
 		submit_bio_noacct(bio);
 		*bio_ptr = split_bio;
 	}