Subject: Re: [PATCH 00/10 net-next] Convert CONFIG_IPV6 to built-in and remove stubs

From: Jakub Kicinski <[email-masked]>
Date: Tue, 10 Mar 2026 14:42:25 -0700

On Tue, 10 Mar 2026 21:02:40 +0100 Krzysztof Kozlowski wrote:
> > Here is the top line of bloatometer without debug info:
> > 
> >   add/remove: 1769/7 grow/shrink: 86/0 up/down: 374521/-228 (374293)
> > 
> > The vmlinux increases by 200kB with IPv6 built in.
> > Not a very dramatic increase.
> > 
> > Please note that opening any dual-stack socket will cause the IPv6
> > module to get loaded. And opening a dual-stack socket will fail if 
> > IPv6 is blacklisted. So I find it quite hard to believe that other
> > that deeply embedded systems with custom configs there are systems
> > out there which don't end up with IPv6 loaded. Whether they have 
> > a single IPv6 address configured or not.  
> 
> Yes, Ubuntu for that reasons does not have it even as module.
> 
> This should be used as *the* argument for these changes.

Completely fair, the submission is severely lacking in motivation 
and impact analysis :(