From efb842c45e667332774196bd5a1d539d048159cc Mon Sep 17 00:00:00 2001 From: wangweidong Date: Wed, 12 Feb 2014 09:44:44 +0800 Subject: [PATCH] sctp: optimize the sctp_sysctl_net_register Here, when the net is init_net, we needn't to kmemdup the ctl_table again. So add a check for net. Also we can save some memory. Signed-off-by: Wang Weidong Acked-by: Neil Horman Signed-off-by: David S. Miller --- net/sctp/sysctl.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c index d354de5..35c8923 100644 --- a/net/sctp/sysctl.c +++ b/net/sctp/sysctl.c @@ -402,15 +402,18 @@ static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write, int sctp_sysctl_net_register(struct net *net) { - struct ctl_table *table; - int i; + struct ctl_table *table = sctp_net_table; + + if (!net_eq(net, &init_net)) { + int i; - table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL); - if (!table) - return -ENOMEM; + table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL); + if (!table) + return -ENOMEM; - for (i = 0; table[i].data; i++) - table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp; + for (i = 0; table[i].data; i++) + table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp; + } net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table); return 0; -- 2.7.4