linux-kernel - [PATCH v4 1/3] io_uring: only call io_should_terminate

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Message-ID: <20251031203430.3886957-2-csander@purestorage.com>
Date: Fri, 31 Oct 2025 14:34:28 -0600
From: Caleb Sander Mateos <csander@...estorage.com>
To: Jens Axboe <axboe@...nel.dk>,
	Miklos Szeredi <miklos@...redi.hu>,
	Ming Lei <ming.lei@...hat.com>,
	Keith Busch <kbusch@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Chris Mason <clm@...com>,
	David Sterba <dsterba@...e.com>
Cc: io-uring@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-block@...r.kernel.org,
	linux-nvme@...ts.infradead.org,
	linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Caleb Sander Mateos <csander@...estorage.com>
Subject: [PATCH v4 1/3] io_uring: only call io_should_terminate_tw() once for ctx

io_fallback_req_func() calls io_should_terminate_tw() on each req's ctx.
But since the reqs all come from the ctx's fallback_llist, req->ctx will
be ctx for all of the reqs. Therefore, compute ts.cancel as
io_should_terminate_tw(ctx) just once, outside the loop.

Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
---
 io_uring/io_uring.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 93a1cc2bf383..4e6676ac4662 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -287,14 +287,13 @@ static __cold void io_fallback_req_func(struct work_struct *work)
 	struct io_kiocb *req, *tmp;
 	struct io_tw_state ts = {};
 
 	percpu_ref_get(&ctx->refs);
 	mutex_lock(&ctx->uring_lock);
-	llist_for_each_entry_safe(req, tmp, node, io_task_work.node) {
-		ts.cancel = io_should_terminate_tw(req->ctx);
+	ts.cancel = io_should_terminate_tw(ctx);
+	llist_for_each_entry_safe(req, tmp, node, io_task_work.node)
 		req->io_task_work.func(req, ts);
-	}
 	io_submit_flush_completions(ctx);
 	mutex_unlock(&ctx->uring_lock);
 	percpu_ref_put(&ctx->refs);
 }
 
-- 
2.45.2