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Miller" , David Ahern , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?Q?Ricard?= =?utf-8?Q?o_B_=2E_Marli=C3=A8re?= , Krzysztof Kozlowski Subject: Re: [PATCH v2] ipv6: default IPV6_SIT to m In-Reply-To: <5f676587-fcdd-4704-9523-07a7fd98455a@suse.de> References: <20260503192515.290900-2-hi@alyssa.is> <5f676587-fcdd-4704-9523-07a7fd98455a@suse.de> Date: Mon, 04 May 2026 16:30:51 +0200 Message-ID: <878q9zdz6s.fsf@alyssa.is> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Fernando Fernandez Mancera writes: > On 5/3/26 9:25 PM, Alyssa Ross wrote: >> 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. >>=20 >> Fixes: 309b905deee59 ("ipv6: convert CONFIG_IPV6 to built-in only and cl= ean up Kconfigs") >> Signed-off-by: Alyssa Ross > > Hi, I am not sure about this. IPV6_SIT was already defaulting to 'y' for= =20 > most distributions (except for ARM). Sure, if you had CONFIG_IPV6=3Dm the= n=20 > CONFIG_IPV6_SIT was defaulting to 'm'. > > Hm. Maybe we can aim this for net-next tree instead of net? I just don't= =20 > think this is a fix but a change in behavior. FWIW, it makes sense to me= =20 > to have this as a module by default. > > Let's see what do others think. Yes, it appears you're right. I had only tested on ARM. In that case, perhaps it make sense to instead set this to m in the arm64 defconfig, to preserve the previous situation, but I can also see the value in reducing platform discongruity by letting it change to y on arm64 too. --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEARYKAB0WIQRV/neXydHjZma5XLJbRZGEIw/wogUCafitmwAKCRBbRZGEIw/w or0EAQDFdUqaDgVAWzQCvBcq5MeKTpoMcu8P9q0+TsR4I249TwD/XWXc+Y1bp3To BCuHzMnUih5DCohtUAXHZ+cz+O1N0gM= =uL/Y -----END PGP SIGNATURE----- --=-=-=--