io_uring: drop exec checks from io_req_task_submit

In case of on-exec io_uring cancellations, tasks already wait for all
submitted requests to get completed/cancelled, so we don't need to check
for ->in_execve separately.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/be8707049f10df9d20ca03dc4ca3316239b5e8e0.1628471125.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -2046,7 +2046,7 @@ static void io_req_task_submit(struct io_kiocb *req)
 
 	/* ctx stays valid until unlock, even if we drop all ours ctx->refs */
 	mutex_lock(&ctx->uring_lock);
-	if (!(req->task->flags & PF_EXITING) && !req->task->in_execve)
+	if (likely(!(req->task->flags & PF_EXITING)))
 		__io_queue_sqe(req);
 	else
 		io_req_complete_failed(req, -EFAULT);