Hi Paolo,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]
[also build test WARNING on v5.4-rc7 next-20191115]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Paolo-Abeni/net-introduce-and-use-route-hint/20191116-172108
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 20021578ba226bda1f0ddf50e4d4a12ea1c6c6c1
config: i386-randconfig-f001-20191117 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-14) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/export.h:42:0,
                    from include/linux/linkage.h:7,
                    from include/linux/kernel.h:8,
                    from include/linux/list.h:9,
                    from include/linux/module.h:9,
                    from net/ipv4/ip_input.c:111:
   net/ipv4/ip_input.c: In function 'ip_list_rcv_finish':
   net/ipv4/ip_input.c:570:19: error: 'struct netns_ipv4' has no member named 'fib_has_custom_rules'; did you mean 'fib_has_custom_local_routes'?
       if (!net->ipv4.fib_has_custom_rules &&
                      ^
   include/linux/compiler.h:58:52: note: in definition of macro '__trace_if_var'
    #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                       ^~~~
>> net/ipv4/ip_input.c:570:4: note: in expansion of macro 'if'
       if (!net->ipv4.fib_has_custom_rules &&
       ^~
   net/ipv4/ip_input.c:570:19: error: 'struct netns_ipv4' has no member named 'fib_has_custom_rules'; did you mean 'fib_has_custom_local_routes'?
       if (!net->ipv4.fib_has_custom_rules &&
                      ^
   include/linux/compiler.h:58:61: note: in definition of macro '__trace_if_var'
    #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                                ^~~~
>> net/ipv4/ip_input.c:570:4: note: in expansion of macro 'if'
       if (!net->ipv4.fib_has_custom_rules &&
       ^~
   net/ipv4/ip_input.c:570:19: error: 'struct netns_ipv4' has no member named 'fib_has_custom_rules'; did you mean 'fib_has_custom_local_routes'?
       if (!net->ipv4.fib_has_custom_rules &&
                      ^
   include/linux/compiler.h:69:3: note: in definition of macro '__trace_if_value'
     (cond) ?     \
      ^~~~
   include/linux/compiler.h:56:28: note: in expansion of macro '__trace_if_var'
    #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
                               ^~~~~~~~~~~~~~
>> net/ipv4/ip_input.c:570:4: note: in expansion of macro 'if'
       if (!net->ipv4.fib_has_custom_rules &&
       ^~

vim +/if +570 net/ipv4/ip_input.c

   542	
   543	static void ip_list_rcv_finish(struct net *net, struct sock *sk,
   544				       struct list_head *head)
   545	{
   546		struct ip_route_input_hint _hint, *hint = NULL;
   547		struct dst_entry *curr_dst = NULL;
   548		struct sk_buff *skb, *next;
   549		struct list_head sublist;
   550	
   551		INIT_LIST_HEAD(&sublist);
   552		list_for_each_entry_safe(skb, next, head, list) {
   553			struct net_device *dev = skb->dev;
   554			struct dst_entry *dst;
   555	
   556			skb_list_del_init(skb);
   557			/* if ingress device is enslaved to an L3 master device pass the
   558			 * skb to its handler for processing
   559			 */
   560			skb = l3mdev_ip_rcv(skb);
   561			if (!skb)
   562				continue;
   563			if (ip_rcv_finish_core(net, sk, skb, dev, hint) == NET_RX_DROP)
   564				continue;
   565	
   566			dst = skb_dst(skb);
   567			if (curr_dst != dst) {
   568				struct rtable *rt = (struct rtable *)dst;
   569	
 > 570				if (!net->ipv4.fib_has_custom_rules &&
   571				    rt->rt_type != RTN_BROADCAST) {
   572					_hint.refdst = skb->_skb_refdst;
   573					_hint.daddr = ip_hdr(skb)->daddr;
   574					_hint.tos = ip_hdr(skb)->tos;
   575					_hint.local = rt->rt_type == RTN_LOCAL;
   576					hint = &_hint;
   577				} else {
   578					hint = NULL;
   579				}
   580	
   581				/* dispatch old sublist */
   582				if (!list_empty(&sublist))
   583					ip_sublist_rcv_finish(&sublist);
   584				/* start new sublist */
   585				INIT_LIST_HEAD(&sublist);
   586				curr_dst = dst;
   587			}
   588			list_add_tail(&skb->list, &sublist);
   589		}
   590		/* dispatch final sublist */
   591		ip_sublist_rcv_finish(&sublist);
   592	}
   593	

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