[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 <[email protected]>
Acked-by: Ralf Baechle <[email protected]>
Acked-by: Martin Schwidefsky <[email protected]>
Cc: Russell King <[email protected]>
Cc: David Howells <[email protected]>
Cc: "Luck, Tony" <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Corey Minyard <[email protected]>
Cc: Neil Brown <[email protected]>
Cc: "John W. Linville" <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Trond Myklebust <[email protected]>
Cc: Mark Fasheh <[email protected]>
Cc: David Chinner <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Patrick McHardy <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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)