Re: [PATCH] mptcp: Fix undefined mptcp_handle_ipv6_mapped for modular IPV6

[David Miller]

From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Date: Thu, 30 Jan 2020 10:45:26 +0100

> If CONFIG_MPTCP=y, CONFIG_MPTCP_IPV6=n, and CONFIG_IPV6=m:
> 
>     ERROR: "mptcp_handle_ipv6_mapped" [net/ipv6/ipv6.ko] undefined!
> 
> This does not happen if CONFIG_MPTCP_IPV6=y, as CONFIG_MPTCP_IPV6
> selects CONFIG_IPV6, and thus forces CONFIG_IPV6 builtin.
> 
> As exporting a symbol for an empty function would be a bit wasteful, fix
> this by providing a dummy version of mptcp_handle_ipv6_mapped() for the
> CONFIG_MPTCP_IPV6=n case.
> 
> Rename mptcp_handle_ipv6_mapped() to mptcpv6_handle_mapped(), to make it
> clear this is a pure-IPV6 function, just like mptcpv6_init().
> 
> Fixes: cec37a6e41aae7bf ("mptcp: Handle MP_CAPABLE options for outgoing connections")
> Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

Looks good, applied, thank you.