From: Li RongQing <lirongqing@xxxxxxxxx> CONNTRACK_LOCKS is divisor when computer array index, if it is power of 2, compiler will optimize modulo operation as bitwise AND, or else modulo will lower performance. Suggested-by: Florian Westphal <fw@xxxxxxxxx> Signed-off-by: Li RongQing <lirongqing@xxxxxxxxx> Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> --- net/netfilter/nf_conntrack_core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index ff9313c579b4..82bfbeef46af 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -2480,6 +2480,7 @@ int nf_conntrack_init_net(struct net *net) int cpu; BUILD_BUG_ON(IP_CT_UNTRACKED == IP_CT_NUMBER); + BUILD_BUG_ON_NOT_POWER_OF_2(CONNTRACK_LOCKS); atomic_set(&net->ct.count, 0); net->ct.pcpu_lists = alloc_percpu(struct ct_pcpu); -- 2.11.0
