On Tue, 17 Mar 2026 15:00:56 +0100 Fernando Fernandez Mancera wrote:

Historically, the Linux kernel has supported compiling the IPv6 stack as
a loadable module. While this made sense in the early days of IPv6
adoption, modern deployments and distributions overwhelmingly either
build IPv6 directly into the kernel (CONFIG_IPV6=y) or disable it
entirely (CONFIG_IPV6=n). The modular IPv6 use-case offers image size
and memory savings for specific setups, this benefit is outweighed by
the architectural burden it imposes on the subsystems on implementation
and maintenance.

Hi Fernando,

NIPA flags a few failures, still:

https://netdev.bots.linux.dev/contest.html?pw-n=0&branch=net-next-2026-03-17--18-00&pw-n=0&pass=0

See stderr for stack trace. The BPF build issue seems to be:

  ../net/bpf/test_run.c:1160:8: error: use of undeclared identifier 'ipv6_bpf_stub'
   1160 |                 if (!ipv6_bpf_stub) {
        |                      ^~~~~~~~~~~~~
  1 error generated.
  make[5]: *** [../scripts/Makefile.build:289: net/bpf/test_run.o] Error 1
  make[4]: *** [../scripts/Makefile.build:546: net/bpf] Error 2
  make[4]: *** Waiting for unfinished jobs....
-- 
pw-bot: cr