io_uring: Use system_dfl_wq instead of system_unbound_wq

Commit de7341ffe49e ("io_uring: switch normal task_work to a mpscq")
added a use of system_unbound_wq, which is deprecated in favor of
system_dfl_wq added by commit 128ea9f6ccfb ("workqueue: Add
system_percpu_wq and system_dfl_wq"). An upcoming warning in the
workqueue tree flags this with:

  workqueue: work func io_tctx_fallback_work enqueued on deprecated workqueue. Use system_{percpu|dfl}_wq instead.

Switch to system_dfl_wq to clear up the warning.

Fixes: de7341ffe49e ("io_uring: switch normal task_work to a mpscq")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20260616-io_uring-fix-wq-warning-v1-1-cfc9d934eedb@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/tw.c b/io_uring/tw.c
index f2ce806b01a1e911b0e15723d4a5900d9c96d4bc..a4c872870d81c6dddb64063f748a1ae89b1787ef 100644 (file)
--- a/io_uring/tw.c
+++ b/io_uring/tw.c
@@ -51,7 +51,7 @@ static void io_fallback_tw(struct io_uring_task *tctx)
         * the queued work) stay around until the drain has run.
         */
        get_task_struct(tctx->task);
-       if (!queue_work(system_unbound_wq, &tctx->fallback_work))
+       if (!queue_work(system_dfl_wq, &tctx->fallback_work))
                put_task_struct(tctx->task);
 }