[WireGuard] Kernel symbol dependencies and KCONFIG usage for kernel packages

[Baptiste Jonglez]

Hi,

I am packaging a new kernel module (wireguard), the package is currently here [1].

However, I have some trouble understanding what KCONFIG does.  Wireguard
needs a few kernel options, so I thought that KCONFIG was the place to
declare such dependencies:

  https://github.com/zorun/packages-1/blob/wireguard/net/wireguard/Makefile#L90

However, it does not seem to enable these options.  The module compiles
fine, it installs fine [2], but then it fails to load at runtime:

Sat Jul  2 10:04:50 2016 kern.warn kernel: [   95.015838] wireguard: Unknown symbol udp_sock_create4 (err 0)
Sat Jul  2 10:04:50 2016 kern.warn kernel: [   95.022021] wireguard: Unknown symbol udp_tunnel6_xmit_skb (err 0)
Sat Jul  2 10:04:50 2016 kern.warn kernel: [   95.028767] wireguard: Unknown symbol udp_tunnel_sock_release (err 0)
Sat Jul  2 10:04:50 2016 kern.warn kernel: [   95.035570] wireguard: Unknown symbol setup_udp_tunnel_sock (err 0)
Sat Jul  2 10:04:50 2016 kern.warn kernel: [   95.042136] wireguard: Unknown symbol udp_sock_create6 (err 0)
Sat Jul  2 10:04:50 2016 kern.warn kernel: [   95.048297] wireguard: Unknown symbol udp_tunnel_xmit_skb (err 0)

It works when selecting the needed options manually in kernel_menuconfig,
but it's a huge pain.

Is there a way to get the needed kernel options automatically?  Maybe this
only happens for packages that are part of the core Lede distribution?

Thanks,
Baptiste

[1] https://github.com/zorun/packages-1/blob/wireguard/net/wireguard/Makefile
[2] http://paste.aliens-lyon.fr/CBI
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