io_uring: rearrange defer list checks

There should be nothing in the ->work_llist for non DEFER_TASKRUN rings,
so we can skip flag checks and test the list emptiness directly. Also
move it out of io_run_local_work() for inlining.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/331d63fd15ca79b35b95c82a82d9246110686392.1672916894.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -1343,9 +1343,6 @@ int io_run_local_work(struct io_ring_ctx *ctx)
 	bool locked;
 	int ret;
 
-	if (llist_empty(&ctx->work_llist))
-		return 0;
-
 	__set_current_state(TASK_RUNNING);
 	locked = mutex_trylock(&ctx->uring_lock);
 	ret = __io_run_local_work(ctx, &locked);

io_uring/io_uring.h

@@ -289,7 +289,7 @@ static inline int io_run_task_work_ctx(struct io_ring_ctx *ctx)
 	int ret = 0;
 	int ret2;
 
-	if (ctx->flags & IORING_SETUP_DEFER_TASKRUN)
+	if (!llist_empty(&ctx->work_llist))
 		ret = io_run_local_work(ctx);
 
 	/* want to run this after in case more is added */