[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>

Author: ebiederm

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);
 }

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;
 }
 

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;
 }
 

arch/ia64/kernel/crash.c

@@ -222,7 +222,7 @@ 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;
 }

arch/ia64/kernel/perfmon.c

@@ -6726,7 +6726,7 @@ 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

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

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;
 }
 

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;
 }

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;
 }

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;
 }