XFRM6_TUNNEL_SPI_BYADDR_HSIZE
struct hlist_head spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;