[PATCH 01/13 net-next] net: ipv4: introduce CONFIG_IPV4 to decouple the IPv4 stack

[Chuck Lever]

On Thu, Sep 10, 2026, at 10:48 AM, Fernando Fernandez Mancera wrote:
> Historically, the IPv4 protocol has been linked to the core INET
> subsystem. Because shared infrastructure like the TCP/UDP engine,
> routing or INET hashtables live inside net/ipv4/, it has been impossible
> to compile a kernel with only IPv6 support.
>
> This patch introduces the CONFIG_IPV4 Kconfig symbol, which is set to
> 'def_bool y' for now. This does not allow to completely disable the
> IPv4 stack yet but it lays the necessary build-system work for that
> goal.
>
> In addition, multiple subsystems Kconfig symbols across networking
> features like tunnels, drivers and filesystems have been adjusted to
> depend on IPv4. Keep on mind that follow-up work is required to convert
> the Kconfig symbol to bool and remove the dependency on IPv4 where it
> makes sense.
>
> Signed-off-by: Fernando Fernandez Mancera <fmancera at suse.de>

> diff --git a/net/sunrpc/Kconfig b/net/sunrpc/Kconfig
> index e7808e5714dc..58e6f6db3100 100644
> --- a/net/sunrpc/Kconfig
> +++ b/net/sunrpc/Kconfig
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  config SUNRPC
>  	tristate
> -	depends on MULTIUSER
> +	depends on MULTIUSER && IPV4
> 
>  config SUNRPC_GSS
>  	tristate

Acked-by: Chuck Lever <cel at kernel.org>


-- 
Chuck Lever (Come to NFS bake-a-thon! https://nfsv4bat.org)