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authorYafang Shao <laoar.shao@gmail.com>2018-09-01 15:21:05 +0300
committerDavid S. Miller <davem@davemloft.net>2018-09-03 02:12:41 +0300
commit743e481580b4646cde416dd549e2ecb0f16848d2 (patch)
tree00361e1606ba513c5f8059cc13d9312abd2d7b50 /net/ipv4/tcp_ipv4.c
parent1914104fc6f84c1fa9947f3f304a34816d1fabee (diff)
downloadlinux-743e481580b4646cde416dd549e2ecb0f16848d2.tar.xz
tcp: remove useless add operation when init sysctl_max_tw_buckets
cp_hashinfo.ehash_mask is always an odd number, which is set in function alloc_large_system_hash(). See bellow, if (_hash_mask) *_hash_mask = (1 << log2qty) - 1; <<< always odd number Hence the local variable 'cnt' is a even number, as a result of that it is no difference to do the incrementation here. Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 44c09eddbb78..09547ef9c4c6 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2549,7 +2549,7 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_tcp_tw_reuse = 2;
cnt = tcp_hashinfo.ehash_mask + 1;
- net->ipv4.tcp_death_row.sysctl_max_tw_buckets = (cnt + 1) / 2;
+ net->ipv4.tcp_death_row.sysctl_max_tw_buckets = cnt / 2;
net->ipv4.tcp_death_row.hashinfo = &tcp_hashinfo;
net->ipv4.sysctl_max_syn_backlog = max(128, cnt / 256);