Dave Hansen wrote:
> On Fri, 2006-12-15 at 18:20 +0100, dlezcano@fr.ibm.com wrote:
>   
>> --- 2.6.19-mm1.orig/net/ipv4/udp.c
>> +++ 2.6.19-mm1/net/ipv4/udp.c
>> @@ -306,9 +306,12 @@ static inline struct sock *udp_v4_mcast_
>>                     (inet->dport != rmt_port && inet->dport)            ||
>>                     (inet->rcv_saddr && inet->rcv_saddr != loc_addr)    ||
>>                     ipv6_only_sock(s)                                   ||
>> -                   !net_ns_match(sk->sk_net_ns, ns)                    ||
>>                     (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
>>                         continue;
>> +#ifdef CONFIG_NET_NS
>> +               if (!net_ns_sock_is_visible(sk, ns))
>> +                       continue;
>> +#endif 
>>     
>
> Why is this #ifdef needed?  Isn't the stub in the header good enough?
>   
I don't know. What does the compiler ? Will it remove the "return 1" 
code from the stub if CONFIG_NET_NS is disabled because the test will be 
always true ?

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