From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4BC2D348895; Mon, 9 Mar 2026 11:33:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773055988; cv=none; b=uSAf8xIf9H3arQ8ohHXPieHs+aMTmppRz6EDHnR+I+Nko1SJ9hG5jLF4AhOg1aGf/wgRHseCDr+0FcbeexSZZrLg+qZS/sjVzJVyC0RMExzM/mpd5/Pq3+H6Hh9LO+mjbswiU/CzBM6jxdTxWiHIwFTHH46hizPOVKDA7R2RyI4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773055988; c=relaxed/simple; bh=AKCAbuLRzj7y6b1d0tDPtiMEd5ifxgA2YFBIgU0E/sc=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Tl+mZOKr3SmuIbox/Rwucdd5APHB9xckWv4KIYIF0MYadyQgcDwLrd/DSNCNSHzZNtTzzlsrCqa+cWQk8+RVW96T6rkWDxNlQZzUA2oU73H3q8K5H6INZhbLGPWiyhr0wdQgVrZgkmR7s4O9vi9g57BAns41mYtqdf+v2oZvNeY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=A8ZBQm4Y; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="A8ZBQm4Y" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=AKCAbuLRzj7y6b1d0tDPtiMEd5ifxgA2YFBIgU0E/sc=; b=A8ZBQm4YtOrAWDy3uWqgBFPFZz 1SyTQH9xXR0mwlyS73T2bY0A56Hpf26in3z6Aq3xAEwSW1eYYqianmjAoIBqEXgbLCd9Li7HxZ2KI Uvxi+7jT6qEeggq1eZprn9lQX54Gln9jJ+DWHZDgudF01+/trqiF9kiFcwdbEbUBfRA35b/f9nqm8 XvtcFIuBIZBcuu5NWdHs4irLta/OdkVZu7waBgXcNEZi17Exb2B+3pgm9CV6m3NXjjaHTUUDPlMod /sEZPEpp/YOdtB9IO2JyGoaML/+XkzSHHMjzG6z/+x6dO+IGr/CoNaHLr0kxDrEK2rvv0ndXosocm 5YgpZAlQ==; Received: from [195.11.108.100] (helo=freeip.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vzYr7-0000000C0Bh-2w3n; Mon, 09 Mar 2026 11:33:01 +0000 Message-ID: Subject: Re: [PATCH 00/10 net-next] Convert CONFIG_IPV6 to built-in and remove stubs From: David Woodhouse To: Krzysztof Kozlowski , Fernando Fernandez Mancera , netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, dsahern@kernel.org Date: Mon, 09 Mar 2026 11:33:00 +0000 In-Reply-To: <48ccec3f-dbc8-45c8-afda-e4f7e8f150d6@kernel.org> References: <20260309022013.5199-1-fmancera@suse.de> <48ccec3f-dbc8-45c8-afda-e4f7e8f150d6@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-EToEoS2i5RW6iMmy/3ZM" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-EToEoS2i5RW6iMmy/3ZM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2026-03-09 at 11:22 +0100, Krzysztof Kozlowski wrote: > On 09/03/2026 03:19, Fernando Fernandez Mancera wrote: > > Historically, the Linux kernel has supported compiling the IPv6 stack a= s > > 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=3Dy) or disable it > > entirely (CONFIG_IPV6=3Dn). The modular IPv6 use-case provides little t= o > > no practical benefit today. >=20 > It does. We all use generic kernels, thus it is one configuration for > all boards and some setups have IPv6 and some not. The ones without IPv6 > just don't use that module. >=20 > Also, with these generic kernels (so again all machines are using same > ones, e.g. distro) users can easily blacklist the module. Perhaps it's time for CONFIG_LEGACY_IP to be buildable as a module instead, in preparation for its deprecation? --=-EToEoS2i5RW6iMmy/3ZM Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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