[PATCH] sysctl: remove insert_at_head from register_sysctl

The semantic effect of insert_at_head is that it would allow new registered
sysctl entries to override existing sysctl entries of the same name.  Which is
pain for caching and the proc interface never implemented.

I have done an audit and discovered that none of the current users of
register_sysctl care as (excpet for directories) they do not register
duplicate sysctl entries.

So this patch simply removes the support for overriding existing entries in
the sys_sysctl interface since no one uses it or cares and it makes future
enhancments harder.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Corey Minyard <minyard@acm.org>
Cc: Neil Brown <neilb@suse.de>
Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Jan Kara <jack@ucw.cz>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Mark Fasheh <mark.fasheh@oracle.com>
Cc: David Chinner <dgc@sgi.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

30 files changed, 32 insertions, 32 deletions

diff --git a/net/appletalk/sysctl_net_atalk.c b/net/appletalk/sysctl_net_atalk.c
index 4f806b6dd227..7df1778e221a 100644
--- a/net/appletalk/sysctl_net_atalk.c
+++ b/net/appletalk/sysctl_net_atalk.c
@@ -73,7 +73,7 @@ static struct ctl_table_header *atalk_table_header;
 
 void atalk_register_sysctl(void)
 {
-        atalk_table_header = register_sysctl_table(atalk_root_table, 0);
+        atalk_table_header = register_sysctl_table(atalk_root_table);
 }
 
 void atalk_unregister_sysctl(void)
diff --git a/net/ax25/sysctl_net_ax25.c b/net/ax25/sysctl_net_ax25.c
index afdba0466f14..443a83676638 100644
--- a/net/ax25/sysctl_net_ax25.c
+++ b/net/ax25/sysctl_net_ax25.c
@@ -245,7 +245,7 @@ void ax25_register_sysctl(void)
 
         ax25_dir_table[0].child = ax25_table;
 
-        ax25_table_header = register_sysctl_table(ax25_root_table, 0);
+        ax25_table_header = register_sysctl_table(ax25_root_table);
 }
 
 void ax25_unregister_sysctl(void)
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index a0744e653f09..7712d76f06ba 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -957,7 +957,7 @@ int __init br_netfilter_init(void)
         if (ret < 0)
                 return ret;
 #ifdef CONFIG_SYSCTL
-        brnf_sysctl_header = register_sysctl_table(brnf_net_table, 0);
+        brnf_sysctl_header = register_sysctl_table(brnf_net_table);
         if (brnf_sysctl_header == NULL) {
                 printk(KERN_WARNING
                        "br_netfilter: can't register to sysctl.\n");
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index a1525fb7a81e..3183142c6044 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2707,7 +2707,7 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
         t->neigh_proto_dir[0].child    = t->neigh_neigh_dir;
         t->neigh_root_dir[0].child     = t->neigh_proto_dir;
 
-        t->sysctl_header = register_sysctl_table(t->neigh_root_dir, 0);
+        t->sysctl_header = register_sysctl_table(t->neigh_root_dir);
         if (!t->sysctl_header) {
                 err = -ENOBUFS;
                 goto free_procname;
diff --git a/net/dccp/sysctl.c b/net/dccp/sysctl.c
index 33916318ed6d..1260aabac5e1 100644
--- a/net/dccp/sysctl.c
+++ b/net/dccp/sysctl.c
@@ -127,7 +127,7 @@ static struct ctl_table_header *dccp_table_header;
 
 int __init dccp_sysctl_init(void)
 {
-        dccp_table_header = register_sysctl_table(dccp_root_table, 0);
+        dccp_table_header = register_sysctl_table(dccp_root_table);
 
         return dccp_table_header != NULL ? 0 : -ENOMEM;
 }
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index 2b2c7fe45a71..0977df42c205 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -282,7 +282,7 @@ static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *
         t->dn_dev_root_dir[0].de = NULL;
         t->dn_dev_vars[0].extra1 = (void *)dev;
 
-        t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir, 0);
+        t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir);
         if (t->sysctl_header == NULL)
                 kfree(t);
         else
diff --git a/net/decnet/sysctl_net_decnet.c b/net/decnet/sysctl_net_decnet.c
index 70a8cf2775df..52e40d7eb22d 100644
--- a/net/decnet/sysctl_net_decnet.c
+++ b/net/decnet/sysctl_net_decnet.c
@@ -491,7 +491,7 @@ static ctl_table dn_root_table[] = {
 
 void dn_register_sysctl(void)
 {
-        dn_table_header = register_sysctl_table(dn_root_table, 0);
+        dn_table_header = register_sysctl_table(dn_root_table);
 }
 
 void dn_unregister_sysctl(void)
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 52db485a88f3..bf3eb2dc7662 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1606,7 +1606,7 @@ static void devinet_sysctl_register(struct in_device *in_dev,
         t->devinet_root_dir[0].child  = t->devinet_proto_dir;
         t->devinet_root_dir[0].de     = NULL;
 
-        t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0);
+        t->sysctl_header = register_sysctl_table(t->devinet_root_dir);
         if (!t->sysctl_header)
             goto free_procname;
 
@@ -1640,7 +1640,7 @@ void __init devinet_init(void)
         rtnetlink_links[PF_INET] = inet_rtnetlink_table;
 #ifdef CONFIG_SYSCTL
         devinet_sysctl.sysctl_header =
-                register_sysctl_table(devinet_sysctl.devinet_root_dir, 0);
+                register_sysctl_table(devinet_sysctl.devinet_root_dir);
         devinet_sysctl_register(NULL, &ipv4_devconf_dflt);
 #endif
 }
diff --git a/net/ipv4/ipvs/ip_vs_ctl.c b/net/ipv4/ipvs/ip_vs_ctl.c
index 8b08d9cdcbc8..b3050a6817e7 100644
--- a/net/ipv4/ipvs/ip_vs_ctl.c
+++ b/net/ipv4/ipvs/ip_vs_ctl.c
@@ -2359,7 +2359,7 @@ int ip_vs_control_init(void)
         proc_net_fops_create("ip_vs", 0, &ip_vs_info_fops);
         proc_net_fops_create("ip_vs_stats",0, &ip_vs_stats_fops);
 
-        sysctl_header = register_sysctl_table(vs_root_table, 0);
+        sysctl_header = register_sysctl_table(vs_root_table);
 
         /* Initialize ip_vs_svc_table, ip_vs_svc_fwm_table, ip_vs_rtable */
         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++)  {
diff --git a/net/ipv4/ipvs/ip_vs_lblc.c b/net/ipv4/ipvs/ip_vs_lblc.c
index 76fd1fb91878..c801273cb881 100644
--- a/net/ipv4/ipvs/ip_vs_lblc.c
+++ b/net/ipv4/ipvs/ip_vs_lblc.c
@@ -583,7 +583,7 @@ static struct ip_vs_scheduler ip_vs_lblc_scheduler =
 static int __init ip_vs_lblc_init(void)
 {
         INIT_LIST_HEAD(&ip_vs_lblc_scheduler.n_list);
-        sysctl_header = register_sysctl_table(lblc_root_table, 0);
+        sysctl_header = register_sysctl_table(lblc_root_table);
         return register_ip_vs_scheduler(&ip_vs_lblc_scheduler);
 }
 
diff --git a/net/ipv4/ipvs/ip_vs_lblcr.c b/net/ipv4/ipvs/ip_vs_lblcr.c
index bf1e7f272b84..23f9b9e73c85 100644
--- a/net/ipv4/ipvs/ip_vs_lblcr.c
+++ b/net/ipv4/ipvs/ip_vs_lblcr.c
@@ -841,7 +841,7 @@ static struct ip_vs_scheduler ip_vs_lblcr_scheduler =
 static int __init ip_vs_lblcr_init(void)
 {
         INIT_LIST_HEAD(&ip_vs_lblcr_scheduler.n_list);
-        sysctl_header = register_sysctl_table(lblcr_root_table, 0);
+        sysctl_header = register_sysctl_table(lblcr_root_table);
 #ifdef CONFIG_IP_VS_LBLCR_DEBUG
         proc_net_create("ip_vs_lblcr", 0, ip_vs_lblcr_getinfo);
 #endif
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
index 2c02ff03bc4c..e6942992b2f6 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
@@ -622,7 +622,7 @@ static int __init ip_conntrack_proto_sctp_init(void)
         }
 
 #ifdef CONFIG_SYSCTL
-        ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
+        ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table);
         if (ip_ct_sysctl_header == NULL) {
                 ret = -ENOMEM;
                 printk("ip_conntrack_proto_sctp: can't register to sysctl.\n");
diff --git a/net/ipv4/netfilter/ip_conntrack_standalone.c b/net/ipv4/netfilter/ip_conntrack_standalone.c
index c7c1ec61b0f5..56b2f7546d1e 100644
--- a/net/ipv4/netfilter/ip_conntrack_standalone.c
+++ b/net/ipv4/netfilter/ip_conntrack_standalone.c
@@ -848,7 +848,7 @@ static int __init ip_conntrack_standalone_init(void)
                 goto cleanup_proc_stat;
         }
 #ifdef CONFIG_SYSCTL
-        ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
+        ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table);
         if (ip_ct_sysctl_header == NULL) {
                 printk("ip_conntrack: can't register to sysctl.\n");
                 ret = -ENOMEM;
diff --git a/net/ipv4/netfilter/ip_queue.c b/net/ipv4/netfilter/ip_queue.c
index 68bf19f3b01c..a14798a850d7 100644
--- a/net/ipv4/netfilter/ip_queue.c
+++ b/net/ipv4/netfilter/ip_queue.c
@@ -693,7 +693,7 @@ static int __init ip_queue_init(void)
         }
 
         register_netdevice_notifier(&ipq_dev_notifier);
-        ipq_sysctl_header = register_sysctl_table(ipq_root_table, 0);
+        ipq_sysctl_header = register_sysctl_table(ipq_root_table);
 
         status = nf_register_queue_handler(PF_INET, &nfqh);
         if (status < 0) {
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 4702954bf0ac..34d80b4aaa04 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4029,7 +4029,7 @@ static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf
         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
         t->addrconf_root_dir[0].de = NULL;
 
-        t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
+        t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
         if (t->sysctl_header == NULL)
                 goto free_procname;
         else
@@ -4114,7 +4114,7 @@ int __init addrconf_init(void)
         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
 #ifdef CONFIG_SYSCTL
         addrconf_sysctl.sysctl_header =
-                register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
+                register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
 #endif
 
diff --git a/net/ipv6/netfilter/ip6_queue.c b/net/ipv6/netfilter/ip6_queue.c
index 58847d3b61e5..fdb30a5916e5 100644
--- a/net/ipv6/netfilter/ip6_queue.c
+++ b/net/ipv6/netfilter/ip6_queue.c
@@ -683,7 +683,7 @@ static int __init ip6_queue_init(void)
         }
 
         register_netdevice_notifier(&ipq_dev_notifier);
-        ipq_sysctl_header = register_sysctl_table(ipq_root_table, 0);
+        ipq_sysctl_header = register_sysctl_table(ipq_root_table);
 
         status = nf_register_queue_handler(PF_INET6, &nfqh);
         if (status < 0) {
diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c
index 25e8e7783fee..3fb44277207b 100644
--- a/net/ipv6/sysctl_net_ipv6.c
+++ b/net/ipv6/sysctl_net_ipv6.c
@@ -107,7 +107,7 @@ static ctl_table ipv6_root_table[] = {
 
 void ipv6_sysctl_register(void)
 {
-        ipv6_sysctl_header = register_sysctl_table(ipv6_root_table, 0);
+        ipv6_sysctl_header = register_sysctl_table(ipv6_root_table);
 }
 
 void ipv6_sysctl_unregister(void)
diff --git a/net/ipx/sysctl_net_ipx.c b/net/ipx/sysctl_net_ipx.c
index 0397b0985b79..0cf526450536 100644
--- a/net/ipx/sysctl_net_ipx.c
+++ b/net/ipx/sysctl_net_ipx.c
@@ -52,7 +52,7 @@ static struct ctl_table_header *ipx_table_header;
 
 void ipx_register_sysctl(void)
 {
-        ipx_table_header = register_sysctl_table(ipx_root_table, 0);
+        ipx_table_header = register_sysctl_table(ipx_root_table);
 }
 
 void ipx_unregister_sysctl(void)
diff --git a/net/irda/irsysctl.c b/net/irda/irsysctl.c
index bb53ba0be585..2e968e7d8fea 100644
--- a/net/irda/irsysctl.c
+++ b/net/irda/irsysctl.c
@@ -274,7 +274,7 @@ static struct ctl_table_header *irda_table_header;
  */
 int __init irda_sysctl_register(void)
 {
-        irda_table_header = register_sysctl_table(irda_root_table, 0);
+        irda_table_header = register_sysctl_table(irda_root_table);
         if (!irda_table_header)
                 return -ENOMEM;
 
diff --git a/net/llc/sysctl_net_llc.c b/net/llc/sysctl_net_llc.c
index bcec7e1eda95..46992d036017 100644
--- a/net/llc/sysctl_net_llc.c
+++ b/net/llc/sysctl_net_llc.c
@@ -116,7 +116,7 @@ static struct ctl_table_header *llc_table_header;
 
 int __init llc_sysctl_init(void)
 {
-        llc_table_header = register_sysctl_table(llc_root_table, 0);
+        llc_table_header = register_sysctl_table(llc_root_table);
 
         return llc_table_header ? 0 : -ENOMEM;
 }
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index a0bba481d70d..b8586360e519 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -445,7 +445,7 @@ static int __init nf_conntrack_standalone_init(void)
         proc_stat->owner = THIS_MODULE;
 #endif
 #ifdef CONFIG_SYSCTL
-        nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
+        nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table);
         if (nf_ct_sysctl_header == NULL) {
                 printk("nf_conntrack: can't register to sysctl.\n");
                 ret = -ENOMEM;
diff --git a/net/netfilter/nf_sysctl.c b/net/netfilter/nf_sysctl.c
index 06ddddb2911f..ee34589e48a4 100644
--- a/net/netfilter/nf_sysctl.c
+++ b/net/netfilter/nf_sysctl.c
@@ -56,7 +56,7 @@ nf_register_sysctl_table(struct ctl_table *path, struct ctl_table *table)
         path = path_dup(path, table);
         if (path == NULL)
                 return NULL;
-        header = register_sysctl_table(path, 0);
+        header = register_sysctl_table(path);
         if (header == NULL)
                 path_free(path, table);
         return header;
diff --git a/net/netrom/sysctl_net_netrom.c b/net/netrom/sysctl_net_netrom.c
index 6ca96a56663c..2ea68da01fb8 100644
--- a/net/netrom/sysctl_net_netrom.c
+++ b/net/netrom/sysctl_net_netrom.c
@@ -192,7 +192,7 @@ static ctl_table nr_root_table[] = {
 
 void __init nr_register_sysctl(void)
 {
-        nr_table_header = register_sysctl_table(nr_root_table, 0);
+        nr_table_header = register_sysctl_table(nr_root_table);
 }
 
 void nr_unregister_sysctl(void)
diff --git a/net/rose/sysctl_net_rose.c b/net/rose/sysctl_net_rose.c
index b9210461a8b4..455b0555a669 100644
--- a/net/rose/sysctl_net_rose.c
+++ b/net/rose/sysctl_net_rose.c
@@ -160,7 +160,7 @@ static ctl_table rose_root_table[] = {
 
 void __init rose_register_sysctl(void)
 {
-        rose_table_header = register_sysctl_table(rose_root_table, 0);
+        rose_table_header = register_sysctl_table(rose_root_table);
 }
 
 void rose_unregister_sysctl(void)
diff --git a/net/rxrpc/sysctl.c b/net/rxrpc/sysctl.c
index 0755ae028e43..884290754af7 100644
--- a/net/rxrpc/sysctl.c
+++ b/net/rxrpc/sysctl.c
@@ -97,7 +97,7 @@ static ctl_table rxrpc_dir_sysctl_table[] = {
 int rxrpc_sysctl_init(void)
 {
 #ifdef CONFIG_SYSCTL
-        rxrpc_sysctl = register_sysctl_table(rxrpc_dir_sysctl_table, 0);
+        rxrpc_sysctl = register_sysctl_table(rxrpc_dir_sysctl_table);
         if (!rxrpc_sysctl)
                 return -ENOMEM;
 #endif /* CONFIG_SYSCTL */
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index 633cd178654b..e2c679baf912 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -254,7 +254,7 @@ static struct ctl_table_header * sctp_sysctl_header;
 /* Sysctl registration.  */
 void sctp_sysctl_register(void)
 {
-        sctp_sysctl_header = register_sysctl_table(sctp_root_table, 0);
+        sctp_sysctl_header = register_sysctl_table(sctp_root_table);
 }
 
 /* Sysctl deregistration.  */
diff --git a/net/sunrpc/sysctl.c b/net/sunrpc/sysctl.c
index 1169798bf271..738db32a287d 100644
--- a/net/sunrpc/sysctl.c
+++ b/net/sunrpc/sysctl.c
@@ -36,7 +36,7 @@ void
 rpc_register_sysctl(void)
 {
         if (!sunrpc_table_header)
-                sunrpc_table_header = register_sysctl_table(sunrpc_table, 0);
+                sunrpc_table_header = register_sysctl_table(sunrpc_table);
 }
 
 void
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 5a9f6d840e82..a5a32029e728 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1636,7 +1636,7 @@ int init_socket_xprt(void)
 {
 #ifdef RPC_DEBUG
         if (!sunrpc_table_header)
-                sunrpc_table_header = register_sysctl_table(sunrpc_table, 0);
+                sunrpc_table_header = register_sysctl_table(sunrpc_table);
 #endif
 
         return 0;
diff --git a/net/unix/sysctl_net_unix.c b/net/unix/sysctl_net_unix.c
index 690ffa5d5bfb..eb0bd57ebada 100644
--- a/net/unix/sysctl_net_unix.c
+++ b/net/unix/sysctl_net_unix.c
@@ -50,7 +50,7 @@ static struct ctl_table_header * unix_sysctl_header;
 
 void unix_sysctl_register(void)
 {
-        unix_sysctl_header = register_sysctl_table(unix_root_table, 0);
+        unix_sysctl_header = register_sysctl_table(unix_root_table);
 }
 
 void unix_sysctl_unregister(void)
diff --git a/net/x25/sysctl_net_x25.c b/net/x25/sysctl_net_x25.c
index 68300d4c19cc..a59b77f18234 100644
--- a/net/x25/sysctl_net_x25.c
+++ b/net/x25/sysctl_net_x25.c
@@ -106,7 +106,7 @@ static struct ctl_table x25_root_table[] = {
 
 void __init x25_register_sysctl(void)
 {
-        x25_table_header = register_sysctl_table(x25_root_table, 0);
+        x25_table_header = register_sysctl_table(x25_root_table);
 }
 
 void x25_unregister_sysctl(void)