Function br_setup

src/setup.c:634–667

#if defined(__hppa__)
static struct io_uring_buf_ring *br_setup(struct io_uring *ring,
					  unsigned int nentries, int bgid,
					  unsigned int flags, int *err)
{
	struct io_uring_buf_ring *br;
	struct io_uring_buf_reg reg;
	size_t ring_size;
	off_t off;
	int lret;

	memset(&reg, 0, sizeof(reg));
	reg.ring_entries = nentries;
	reg.bgid = bgid;
	reg.flags = IOU_PBUF_RING_MMAP;

	*err = 0;
	lret = io_uring_register_buf_ring(ring, &reg, flags);
	if (lret) {
		*err = lret;
		return NULL;
	}

	off = IORING_OFF_PBUF_RING | (unsigned long long) bgid << IORING_OFF_PBUF_SHIFT;
	ring_size = nentries * sizeof(struct io_uring_buf);
	br = __sys_mmap(NULL, ring_size, PROT_READ | PROT_WRITE,
			MAP_SHARED | MAP_POPULATE, ring->ring_fd, off);
	if (IS_ERR(br)) {
		*err = PTR_ERR(br);
		io_uring_unregister_buf_ring(ring, bgid);
		return NULL;
	}

	return br;
}
#else
static struct io_uring_buf_ring *br_setup(struct io_uring *ring,
					  unsigned int nentries, int bgid,