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Date:   Wed, 5 Aug 2020 15:06:27 +0200
From:   Stefano Brivio <>
To:     Stephen Rothwell <>,
Cc:     David Miller <>,
        Networking <>,
        Linux Next Mailing List <>,
        Linux Kernel Mailing List <>,
        Cong Wang <>
Subject: Re: linux-next: build failure after merge of the net-next tree

On Wed, 5 Aug 2020 22:31:21 +1000
Stephen Rothwell <> wrote:

> Hi all,
> After merging the net-next tree, today's linux-next build (s390 defconfig)
> failed like this:
> net/ipv4/ip_tunnel_core.c:335:2: error: implicit declaration of function 'csum_ipv6_magic' [-Werror=implicit-function-declaration]
> Caused by commit
>   4cb47a8644cc ("tunnels: PMTU discovery support for directly bridged IP packets")

Ouch, sorry for that.

I'm getting a few of them by the way:

net/core/skbuff.o: In function `skb_checksum_setup_ipv6':
/home/sbrivio/net-next/net/core/skbuff.c:4980: undefined reference to `csum_ipv6_magic'
net/core/netpoll.o: In function `netpoll_send_udp':
/home/sbrivio/net-next/net/core/netpoll.c:419: undefined reference to `csum_ipv6_magic'
net/netfilter/utils.o: In function `nf_ip6_checksum':
/home/sbrivio/net-next/net/netfilter/utils.c:74: undefined reference to `csum_ipv6_magic'
/home/sbrivio/net-next/net/netfilter/utils.c:84: undefined reference to `csum_ipv6_magic'
net/netfilter/utils.o: In function `nf_ip6_checksum_partial':
/home/sbrivio/net-next/net/netfilter/utils.c:112: undefined reference to `csum_ipv6_magic'
net/ipv4/ip_tunnel_core.o:/home/sbrivio/net-next/net/ipv4/ip_tunnel_core.c:335: more undefined references to `csum_ipv6_magic' follow

...checking how it should be fixed now.

Heiko, by the way, do we want to provide a s390 version similar to the
existing csum_partial() implementation in
arch/s390/include/asm/checksum.h right away? Otherwise, I'll just take
care of the ifdeffery.


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