net: pass a sockptr_t into ->setsockopt

Rework the remaining setsockopt code to pass a sockptr_t instead of a
plain user pointer.  This removes the last remaining set_fs(KERNEL_DS)
outside of architecture specific code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Stefan Schmidt <stefan@datenfreihafen.org> [ieee802154]
Acked-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 4c9d89b..bd1f396 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -1084,8 +1084,8 @@ struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
  *	socket options (ipv6_sockglue.c)
  */
 
-int ipv6_setsockopt(struct sock *sk, int level, int optname,
-		    char __user *optval, unsigned int optlen);
+int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+		    unsigned int optlen);
 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 		    char __user *optval, int __user *optlen);