atomic64_xchg_relaxed
vmid = atomic64_xchg_relaxed(&per_cpu(active_vmids, cpu), 0);
asid = atomic64_xchg_relaxed(&per_cpu(active_asids, i), 0);
asid = atomic64_xchg_relaxed(&active_asid(info, i), 0);
return atomic64_xchg_relaxed(v, new);