__VM_CACHELINE_MASK
KASSERT(size > 0 && (size & __VM_CACHELINE_MASK) == 0,
CTASSERT((sizeof(struct rtstatistics) & __VM_CACHELINE_MASK) == 0);
CTASSERT((sizeof(struct ip_stats) & __VM_CACHELINE_MASK) == 0);
CTASSERT((sizeof(struct tcp_stats) & __VM_CACHELINE_MASK) == 0);
CTASSERT((sizeof(struct udpstat) & __VM_CACHELINE_MASK) == 0);
(((n) + __VM_CACHELINE_MASK) & ~__VM_CACHELINE_MASK)