randconfig build error with next-20140109, in net/ipv6/ip6_vti.c

Building with the attached random configuration file,



net/ipv6/ip6_vti.c: In function ‘vti6_dev_init_gen’:
net/ipv6/ip6_vti.c:743:9: warning: assignment from incompatible
pointer type [enabled by default]
   stats = per_cpu_ptr(dev->tstats, i);
         ^
In file included from include/linux/time.h:5:0,
                 from include/linux/stat.h:18,
                 from include/linux/module.h:10,
                 from net/ipv6/ip6_vti.c:18:
net/ipv6/ip6_vti.c:744:24: error: dereferencing pointer to incomplete type
   u64_stats_init(&stats->syncp);
                        ^
include/linux/seqlock.h:70:20: note: in definition of macro ‘seqcount_init’
   __seqcount_init((s), #s, &__key); \
                    ^
net/ipv6/ip6_vti.c:744:3: note: in expansion of macro ‘u64_stats_init’
   u64_stats_init(&stats->syncp);
   ^
make[2]: *** [net/ipv6/ip6_vti.o] Error 1

From: Jim Davis <redacted>
Date: Thu, 9 Jan 2014 06:55:50 -0700

Building with the attached random configuration file,

I cannot reproduce this in either the 'net' or 'net-next' tree.