From: Eric W. Biederman <ebiederm@xmission.com> - unquoted

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>
---
 arch/arm/kernel/isa.c                        |    2 +-
 arch/frv/kernel/pm.c                         |    2 +-
 arch/frv/kernel/sysctl.c                     |    2 +-
 arch/ia64/kernel/crash.c                     |    2 +-
 arch/ia64/kernel/perfmon.c                   |    2 +-
 arch/ia64/sn/kernel/xpc_main.c               |    2 +-
 arch/mips/au1000/common/power.c              |    2 +-
 arch/mips/lasat/sysctl.c                     |    2 +-
 arch/powerpc/kernel/idle.c                   |    2 +-
 arch/ppc/kernel/ppc_htab.c                   |    2 +-
 arch/s390/appldata/appldata_base.c           |    4 ++--
 arch/s390/kernel/debug.c                     |    2 +-
 arch/s390/mm/cmm.c                           |    2 +-
 arch/sh64/kernel/traps.c                     |    2 +-
 arch/x86_64/ia32/ia32_binfmt.c               |    2 +-
 arch/x86_64/kernel/vsyscall.c                |    2 +-
 arch/x86_64/mm/init.c                        |    2 +-
 drivers/cdrom/cdrom.c                        |    2 +-
 drivers/char/hpet.c                          |    2 +-
 drivers/char/ipmi/ipmi_poweroff.c            |    2 +-
 drivers/char/rtc.c                           |    2 +-
 drivers/macintosh/mac_hid.c                  |    2 +-
 drivers/md/md.c                              |    2 +-
 drivers/net/wireless/arlan-proc.c            |    2 +-
 drivers/parport/procfs.c                     |    6 +++---
 drivers/scsi/scsi_sysctl.c                   |    2 +-
 fs/coda/sysctl.c                             |    2 +-
 fs/dquot.c                                   |    2 +-
 fs/lockd/svc.c                               |    2 +-
 fs/nfs/sysctl.c                              |    2 +-
 fs/ntfs/sysctl.c                             |    2 +-
 fs/ocfs2/cluster/nodemanager.c               |    2 +-
 fs/xfs/linux-2.6/xfs_sysctl.c                |    2 +-
 include/linux/sysctl.h                       |    4 ++--
 ipc/ipc_sysctl.c                             |    2 +-
 ipc/mqueue.c                                 |    2 +-
 kernel/sysctl.c                              |    9 ++-------
 kernel/utsname_sysctl.c                      |    2 +-
 net/appletalk/sysctl_net_atalk.c             |    2 +-
 net/ax25/sysctl_net_ax25.c                   |    2 +-
 net/bridge/br_netfilter.c                    |    2 +-
 net/core/neighbour.c                         |    2 +-
 net/dccp/sysctl.c                            |    2 +-
 net/decnet/dn_dev.c                          |    2 +-
 net/decnet/sysctl_net_decnet.c               |    2 +-
 net/ipv4/devinet.c                           |    4 ++--
 net/ipv4/ipvs/ip_vs_ctl.c                    |    2 +-
 net/ipv4/ipvs/ip_vs_lblc.c                   |    2 +-
 net/ipv4/ipvs/ip_vs_lblcr.c                  |    2 +-
 net/ipv4/netfilter/ip_conntrack_proto_sctp.c |    2 +-
 net/ipv4/netfilter/ip_conntrack_standalone.c |    2 +-
 net/ipv4/netfilter/ip_queue.c                |    2 +-
 net/ipv6/addrconf.c                          |    4 ++--
 net/ipv6/netfilter/ip6_queue.c               |    2 +-
 net/ipv6/sysctl_net_ipv6.c                   |    2 +-
 net/ipx/sysctl_net_ipx.c                     |    2 +-
 net/irda/irsysctl.c                          |    2 +-
 net/llc/sysctl_net_llc.c                     |    2 +-
 net/netfilter/nf_conntrack_standalone.c      |    2 +-
 net/netfilter/nf_sysctl.c                    |    2 +-
 net/netrom/sysctl_net_netrom.c               |    2 +-
 net/rose/sysctl_net_rose.c                   |    2 +-
 net/rxrpc/sysctl.c                           |    2 +-
 net/sctp/sysctl.c                            |    2 +-
 net/sunrpc/sysctl.c                          |    2 +-
 net/sunrpc/xprtsock.c                        |    2 +-
 net/unix/sysctl_net_unix.c                   |    2 +-
 net/x25/sysctl_net_x25.c                     |    2 +-
 68 files changed, 75 insertions(+), 80 deletions(-)

diff --git a/arch/arm/kernel/isa.c b/arch/arm/kernel/isa.c
index 54bbd9f..50a30bc 100644
--- a/arch/arm/kernel/isa.c
+++ b/arch/arm/kernel/isa.c
@@ -70,5 +70,5 @@ register_isa_ports(unsigned int membase, unsigned int portbase, unsigned int por
 	isa_membase = membase;
 	isa_portbase = portbase;
 	isa_portshift = portshift;
-	isa_sysctl_header = register_sysctl_table(ctl_bus, 0);
+	isa_sysctl_header = register_sysctl_table(ctl_bus);
 }
diff --git a/arch/frv/kernel/pm.c b/arch/frv/kernel/pm.c
index aa50333..c57ce3f 100644
--- a/arch/frv/kernel/pm.c
+++ b/arch/frv/kernel/pm.c
@@ -455,7 +455,7 @@ static struct ctl_table pm_dir_table[] =
  */
 static int __init pm_init(void)
 {
-	register_sysctl_table(pm_dir_table, 0);
+	register_sysctl_table(pm_dir_table);
 	return 0;
 }
 
diff --git a/arch/frv/kernel/sysctl.c b/arch/frv/kernel/sysctl.c
index 577ad16..3e9d7e0 100644
--- a/arch/frv/kernel/sysctl.c
+++ b/arch/frv/kernel/sysctl.c
@@ -216,7 +216,7 @@ static struct ctl_table frv_dir_table[] =
  */
 static int __init frv_sysctl_init(void)
 {
-	register_sysctl_table(frv_dir_table, 0);
+	register_sysctl_table(frv_dir_table);
 	return 0;
 }
 
diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
index bc2f64d..8a2cb76 100644
--- a/arch/ia64/kernel/crash.c
+++ b/arch/ia64/kernel/crash.c
@@ -214,7 +214,7 @@ machine_crash_setup(void)
 	if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0)
 		return ret;
 #ifdef CONFIG_SYSCTL
-	register_sysctl_table(sys_table, 0);
+	register_sysctl_table(sys_table);
 #endif
 	return 0;
 }
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 8c679ab..8a15377 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -6727,7 +6727,7 @@ pfm_init(void)
 	/*
 	 * create /proc/sys/kernel/perfmon (for debugging purposes)
 	 */
-	pfm_sysctl_header = register_sysctl_table(pfm_sysctl_root, 0);
+	pfm_sysctl_header = register_sysctl_table(pfm_sysctl_root);
 
 	/*
 	 * initialize all our spinlocks
diff --git a/arch/ia64/sn/kernel/xpc_main.c b/arch/ia64/sn/kernel/xpc_main.c
index e04f7b5..68355ef 100644
--- a/arch/ia64/sn/kernel/xpc_main.c
+++ b/arch/ia64/sn/kernel/xpc_main.c
@@ -1241,7 +1241,7 @@ xpc_init(void)
 	snprintf(xpc_part->bus_id, BUS_ID_SIZE, "part");
 	snprintf(xpc_chan->bus_id, BUS_ID_SIZE, "chan");
 
-	xpc_sysctl = register_sysctl_table(xpc_sys_dir, 0);
+	xpc_sysctl = register_sysctl_table(xpc_sys_dir);
 
 	/*
 	 * The first few fields of each entry of xpc_partitions[] need to
diff --git a/arch/mips/au1000/common/power.c b/arch/mips/au1000/common/power.c
index 31256b8..3901e8e 100644
--- a/arch/mips/au1000/common/power.c
+++ b/arch/mips/au1000/common/power.c
@@ -461,7 +461,7 @@ static struct ctl_table pm_dir_table[] = {
  */
 static int __init pm_init(void)
 {
-	register_sysctl_table(pm_dir_table, 0);
+	register_sysctl_table(pm_dir_table);
 	return 0;
 }
 
diff --git a/arch/mips/lasat/sysctl.c b/arch/mips/lasat/sysctl.c
index c04e82f..699ab18 100644
--- a/arch/mips/lasat/sysctl.c
+++ b/arch/mips/lasat/sysctl.c
@@ -432,7 +432,7 @@ static int __init lasat_register_sysctl(void)
 	struct ctl_table_header *lasat_table_header;
 
 	lasat_table_header =
-		register_sysctl_table(lasat_root_table, 0);
+		register_sysctl_table(lasat_root_table);
 
 	return 0;
 }
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c
index 8b27bb1..6e7f509 100644
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -125,7 +125,7 @@ static ctl_table powersave_nap_sysctl_root[] = {
 static int __init
 register_powersave_nap_sysctl(void)
 {
-	register_sysctl_table(powersave_nap_sysctl_root, 0);
+	register_sysctl_table(powersave_nap_sysctl_root);
 
 	return 0;
 }
diff --git a/arch/ppc/kernel/ppc_htab.c b/arch/ppc/kernel/ppc_htab.c
index 77b20ff..0a7e42d 100644
--- a/arch/ppc/kernel/ppc_htab.c
+++ b/arch/ppc/kernel/ppc_htab.c
@@ -457,7 +457,7 @@ static ctl_table htab_sysctl_root[] = {
 static int __init
 register_ppc_htab_sysctl(void)
 {
-	register_sysctl_table(htab_sysctl_root, 0);
+	register_sysctl_table(htab_sysctl_root);
 
 	return 0;
 }
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c
index cdc4109..b1ff93a 100644
--- a/arch/s390/appldata/appldata_base.c
+++ b/arch/s390/appldata/appldata_base.c
@@ -506,7 +506,7 @@ int appldata_register_ops(struct appldata_ops *ops)
 
 	ops->ctl_table[3].ctl_name = 0;
 
-	ops->sysctl_header = register_sysctl_table(ops->ctl_table,0);
+	ops->sysctl_header = register_sysctl_table(ops->ctl_table);
 
 	P_INFO("%s-ops registered!\n", ops->name);
 	return 0;
@@ -606,7 +606,7 @@ static int __init appldata_init(void)
 	/* Register cpu hotplug notifier */
 	register_hotcpu_notifier(&appldata_nb);
 
-	appldata_sysctl_header = register_sysctl_table(appldata_dir_table, 0);
+	appldata_sysctl_header = register_sysctl_table(appldata_dir_table);
 #ifdef MODULE
 	appldata_dir_table[0].de->owner = THIS_MODULE;
 	appldata_table[0].de->owner = THIS_MODULE;
diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c
index d38cb27..00f0382 100644
--- a/arch/s390/kernel/debug.c
+++ b/arch/s390/kernel/debug.c
@@ -1053,7 +1053,7 @@ __init debug_init(void)
 {
 	int rc = 0;
 
-	s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table, 0);
+	s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
 	down(&debug_lock);
 	deb