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Date:   Tue, 21 Jul 2020 08:08:04 +0200
From:   Steffen Klassert <>
To:     Xin Long <>
CC:     <>, kbuild test robot <>,
        "David S. Miller" <>
Subject: Re: [PATCH ipsec-next] xfrm: interface: use IS_REACHABLE to avoid
 some compile errors

On Fri, Jul 17, 2020 at 03:02:30PM +0800, Xin Long wrote:
> kernel test robot reported some compile errors:
>   ia64-linux-ld: net/xfrm/xfrm_interface.o: in function `xfrmi4_fini':
>   net/xfrm/xfrm_interface.c:900: undefined reference to `xfrm4_tunnel_deregister'
>   ia64-linux-ld: net/xfrm/xfrm_interface.c:901: undefined reference to `xfrm4_tunnel_deregister'
>   ia64-linux-ld: net/xfrm/xfrm_interface.o: in function `xfrmi4_init':
>   net/xfrm/xfrm_interface.c:873: undefined reference to `xfrm4_tunnel_register'
>   ia64-linux-ld: net/xfrm/xfrm_interface.c:876: undefined reference to `xfrm4_tunnel_register'
>   ia64-linux-ld: net/xfrm/xfrm_interface.c:885: undefined reference to `xfrm4_tunnel_deregister'
> This happened when set CONFIG_XFRM_INTERFACE=y and CONFIG_INET_TUNNEL=m.
> We don't really want xfrm_interface to depend inet_tunnel completely,
> but only to disable the tunnel code when inet_tunnel is not seen.
> So instead of adding "select INET_TUNNEL" for XFRM_INTERFACE, this patch
> is only to change to IS_REACHABLE to avoid these compile error.
> Reported-by: kernel test robot <>
> Fixes: da9bbf0598c9 ("xfrm: interface: support IPIP and IPIP6 tunnels processing with .cb_handler")
> Signed-off-by: Xin Long <>

Applied, thanks!

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