io_uring: change io_ring_ctx bool fields into bit fields

In preparation for adding another one, which would make us spill into
another long (and hence bump the size of the ctx), change them to
bit fields.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -202,10 +202,10 @@ struct io_ring_ctx {
 
 	struct {
 		unsigned int		flags;
-		bool			compat;
-		bool			account_mem;
-		bool			cq_overflow_flushed;
-		bool			drain_next;
+		int			compat: 1;
+		int			account_mem: 1;
+		int			cq_overflow_flushed: 1;
+		int			drain_next: 1;
 
 		/*
 		 * Ring buffer of indices into array of io_uring_sqe, which is
@@ -994,7 +994,7 @@ static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
 
 	/* if force is set, the ring is going away. always drop after that */
 	if (force)
-		ctx->cq_overflow_flushed = true;
+		ctx->cq_overflow_flushed = 1;
 
 	cqe = NULL;
 	while (!list_empty(&ctx->cq_overflow_list)) {
@@ -4489,9 +4489,9 @@ static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 
 	if (unlikely(req->ctx->drain_next)) {
 		req->flags |= REQ_F_IO_DRAIN;
-		req->ctx->drain_next = false;
+		req->ctx->drain_next = 0;
 	}
-	req->ctx->drain_next = (req->flags & REQ_F_DRAIN_LINK);
+	req->ctx->drain_next = (req->flags & REQ_F_DRAIN_LINK) != 0;
 
 	ret = io_req_defer(req, sqe);
 	if (ret) {