io_uring: make io_sqpoll_wait_sq return void

Change the return type to void since it always return 0, and no need
to do the checking in syscall io_uring_enter.
Signed-off-by: Quanfa Fu <quanfafu@gmail.com>
Link: https://lore.kernel.org/r/20230115071519.554282-1-quanfafu@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -3412,11 +3412,9 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
 		}
 		if (flags & IORING_ENTER_SQ_WAKEUP)
 			wake_up(&ctx->sq_data->wait);
-		if (flags & IORING_ENTER_SQ_WAIT) {
-			ret = io_sqpoll_wait_sq(ctx);
-			if (ret)
-				goto out;
-		}
+		if (flags & IORING_ENTER_SQ_WAIT)
+			io_sqpoll_wait_sq(ctx);
+
 		ret = to_submit;
 	} else if (to_submit) {
 		ret = io_uring_add_tctx_node(ctx);

io_uring/sqpoll.c

@@ -312,7 +312,7 @@ static int io_sq_thread(void *data)
 	do_exit(0);
 }
 
-int io_sqpoll_wait_sq(struct io_ring_ctx *ctx)
+void io_sqpoll_wait_sq(struct io_ring_ctx *ctx)
 {
 	DEFINE_WAIT(wait);
 
@@ -327,7 +327,6 @@ int io_sqpoll_wait_sq(struct io_ring_ctx *ctx)
 	} while (!signal_pending(current));
 
 	finish_wait(&ctx->sqo_sq_wait, &wait);
-	return 0;
 }
 
 __cold int io_sq_offload_create(struct io_ring_ctx *ctx,

io_uring/sqpoll.h

@@ -26,4 +26,4 @@ void io_sq_thread_stop(struct io_sq_data *sqd);
 void io_sq_thread_park(struct io_sq_data *sqd);
 void io_sq_thread_unpark(struct io_sq_data *sqd);
 void io_put_sq_data(struct io_sq_data *sqd);
-int io_sqpoll_wait_sq(struct io_ring_ctx *ctx);
+void io_sqpoll_wait_sq(struct io_ring_ctx *ctx);