[PATCH 1/6] io_uring: grab RCU read lock marking task run

[Jens Axboe <axboe@kernel.dk>]

Not required right now, as io_req_local_work_add() already calls this
helper with the RCU read lock held. But in preparation for that not
being the case, grab it locally.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/tw.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/io_uring/tw.c b/io_uring/tw.c
index 023d5e6bc491..f4335c8d50d9 100644
--- a/io_uring/tw.c
+++ b/io_uring/tw.c
@@ -158,11 +158,11 @@ void tctx_task_work(struct callback_head *cb)
  */
 static void io_ctx_mark_taskrun(struct io_ring_ctx *ctx)
 {
-	lockdep_assert_in_rcu_read_lock();
-
 	if (ctx->flags & IORING_SETUP_TASKRUN_FLAG) {
-		struct io_rings *rings = rcu_dereference(ctx->rings_rcu);
+		struct io_rings *rings;
 
+		guard(rcu)();
+		rings = rcu_dereference(ctx->rings_rcu);
 		atomic_or(IORING_SQ_TASKRUN, &rings->sq_flags);
 	}
 }
-- 
2.53.0