[PATCH v2] ipv6: default IPV6_SIT to m

Alyssa Ross
2026-05-03T19:25:28Z

This basically defaulted to m until recently, since IPV6 defaulted to
m. Since IPV6 was changed to a boolean with a default of y, IPV6_SIT
started defaulting to built-in as well. This results in a surprise
sit0 device by default for defconfig (and defconfig-derived config)
users at boot. For me, this broke an (admittedly non-robust) script.
Preserve the behaviour of most configs by avoiding building this
module, that's probably overall seldom used compared to IPv6 as a
whole, into the kernel.

Fixes: 309b905deee59 ("ipv6: convert CONFIG_IPV6 to built-in only and clean up Kconfigs")
Signed-off-by: Alyssa Ross <hi@alyssa.is>
---
v2: update help text as well

net/ipv6/Kconfig | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index c024aa77f25ba..c3806c6ac96f9 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -164,7 +164,7 @@ config IPV6_SIT
select INET_TUNNEL
select NET_IP_TUNNEL
select IPV6_NDISC_NODETYPE
- default y
+ default m
help
Tunneling means encapsulating data of one protocol type within
another protocol and sending it over a channel that understands the
@@ -172,7 +172,7 @@ config IPV6_SIT
into IPv4 packets. This is useful if you want to connect two IPv6
networks over an IPv4-only path.

- Saying M here will produce a module called sit. If unsure, say Y.
+ Saying M here will produce a module called sit. If unsure, say M.

config IPV6_SIT_6RD
bool "IPv6: IPv6 Rapid Deployment (6RD)"

base-commit: 254f49634ee16a731174d2ae34bc50bd5f45e731
--
2.53.0