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netfilter: nf_conntrack: ensure that CONNTRACK_LOCKS is power of 2 

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@strlen.de>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Li RongQing 2019-02-26 17:20:52 +08:00 committed by Pablo Neira Ayuso
parent a9f5e78c40
commit 2e7b162c5e
1 changed files with 1 additions and 0 deletions
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net/netfilter/nf_conntrack_core.c
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@ -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);