From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v3 0/3] Restore UFO support to virtio_net devices
Date: Mon, 02 Feb 2015 13:11:58 -0800 (PST)
Message-ID: <20150202.131158.2302675247156677150.davem@davemloft.net>
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Vlad, this still fails the same way.

[davem@dokdo net]$ make -s -j8
kernel/Makefile:132: *** No X.509 certificates found ***
kernel/Makefile:132: *** No X.509 certificates found ***
net/built-in.o: In function `udp6_ufo_fragment':
udp_offload.c:(.text+0x103514): undefined reference to `ipv6_select_ident'
make: *** [vmlinux] Error 1

You're putting ipv6_select_ident() into the ipv6 module via
ip6_output.c, but that means that code like udp_offload.c which is
built statically into the kernel can't see the symbol.

Please build allmodconfig, that is the exact build I use to test your
and everyone else's changes.