IORING_OFF_CQ_RING
ret = io_create_region(ctx, &ctx->ring_region, &rd, IORING_OFF_CQ_RING);
case IORING_OFF_CQ_RING:
case IORING_OFF_CQ_RING:
ret = io_create_region(ctx, &n.ring_region, &rd, IORING_OFF_CQ_RING);
MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_CQ_RING);
IORING_OFF_CQ_RING);