io_uring: move cq/sq user offset init around

Move user SQ/CQ offset initialisation at the end of io_prepare_config()
where it already calculated all information to set it properly.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: isilence

io_uring/io_uring.c

@@ -3519,27 +3519,6 @@ static int io_uring_fill_params(struct io_uring_params *p)
 		p->cq_entries = 2 * p->sq_entries;
 	}
 
-	p->sq_off.head = offsetof(struct io_rings, sq.head);
-	p->sq_off.tail = offsetof(struct io_rings, sq.tail);
-	p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask);
-	p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries);
-	p->sq_off.flags = offsetof(struct io_rings, sq_flags);
-	p->sq_off.dropped = offsetof(struct io_rings, sq_dropped);
-	p->sq_off.resv1 = 0;
-	if (!(p->flags & IORING_SETUP_NO_MMAP))
-		p->sq_off.user_addr = 0;
-
-	p->cq_off.head = offsetof(struct io_rings, cq.head);
-	p->cq_off.tail = offsetof(struct io_rings, cq.tail);
-	p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask);
-	p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries);
-	p->cq_off.overflow = offsetof(struct io_rings, cq_overflow);
-	p->cq_off.cqes = offsetof(struct io_rings, cqes);
-	p->cq_off.flags = offsetof(struct io_rings, cq_flags);
-	p->cq_off.resv1 = 0;
-	if (!(p->flags & IORING_SETUP_NO_MMAP))
-		p->cq_off.user_addr = 0;
-
 	return 0;
 }
 
@@ -3561,6 +3540,26 @@ int io_prepare_config(struct io_ctx_config *config)
 	if (ret)
 		return ret;
 
+	p->sq_off.head = offsetof(struct io_rings, sq.head);
+	p->sq_off.tail = offsetof(struct io_rings, sq.tail);
+	p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask);
+	p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries);
+	p->sq_off.flags = offsetof(struct io_rings, sq_flags);
+	p->sq_off.dropped = offsetof(struct io_rings, sq_dropped);
+	p->sq_off.resv1 = 0;
+	if (!(p->flags & IORING_SETUP_NO_MMAP))
+		p->sq_off.user_addr = 0;
+
+	p->cq_off.head = offsetof(struct io_rings, cq.head);
+	p->cq_off.tail = offsetof(struct io_rings, cq.tail);
+	p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask);
+	p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries);
+	p->cq_off.overflow = offsetof(struct io_rings, cq_overflow);
+	p->cq_off.cqes = offsetof(struct io_rings, cqes);
+	p->cq_off.flags = offsetof(struct io_rings, cq_flags);
+	p->cq_off.resv1 = 0;
+	if (!(p->flags & IORING_SETUP_NO_MMAP))
+		p->cq_off.user_addr = 0;
 	if (!(p->flags & IORING_SETUP_NO_SQARRAY))
 		p->sq_off.array = config->layout.sq_array_offset;