From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 D5F442F4A0C for ; Sat, 18 Apr 2026 08:48:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776502134; cv=none; b=UFXf3uCwMZsnYSXhlCXS8/UqkptHKMqpwnQxXYOS/+eL7InjnQSd/QPQ/qXI0zw1OWcp05Gx5BBt9KOyCh5hPcYF6g2oIr8J5XLLDS/3FZyAFyh1K+296wvbDccy2YQ0TOk5edqvUf3y5HpPAGhs885hve4y4etkNPdhPUoM2iw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776502134; c=relaxed/simple; bh=4TemnyeCphvNZp2Jwg3KkCeYo0iCn5hTXLLghBZO5K0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=AD3Md63sNQFrJZMMrb1xXErUMnhbGitdjzAOfOgZpbi7BYFcnzKuev0URPrdd5Sh9rotFFJB5uppTyCQ8h4AZ0PFKThnaofXCNCWlNWcbPJfNkgtJ/0odNwIdHxXF5LG1eaR0u8m9vxN0pTp8jjAjGyJf82fg9uoRovgr9WNaTI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wA3nOMGC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="wA3nOMGC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E9BCCC19424; Sat, 18 Apr 2026 08:48:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776502134; bh=4TemnyeCphvNZp2Jwg3KkCeYo0iCn5hTXLLghBZO5K0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=wA3nOMGCR4R/FovnD2e1cmyf42t6E2tvRrflOwprTHsL1ea+oYG/V4PM2ENGN0oK9 YBa4//W98yo51FD6E6nBLduE1xfGyXVQCk2j9B2wNBCtgTp4aQgC2EJ+he3UJYF43x 4tR3nDphJtydGoZ4zWzIwIvu4ls2uvyhqKD4hSAc= Date: Sat, 18 Apr 2026 10:48:22 +0200 From: Greg KH To: Jakub Kicinski Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, corbet@lwn.net, skhan@linuxfoundation.org, alexs@kernel.org, si.yanteng@linux.dev, dzm91@hust.edu.cn, linux@armlinux.org.uk, mst@redhat.com, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com, xu.xin16@zte.com.cn, wang.yaxin@zte.com.cn, jiang.kun2@zte.com.cn, linusw@kernel.org, jihed.chaibi.dev@gmail.com, arnd@arndb.de, tytso@mit.edu, jiayuan.chen@shopee.com Subject: Re: [PATCH net-deletions] caif: remove CAIF NETWORK LAYER Message-ID: <2026041812-cringe-polyester-d039@gregkh> References: <20260416182829.1440262-1-kuba@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260416182829.1440262-1-kuba@kernel.org> On Thu, Apr 16, 2026 at 11:28:28AM -0700, Jakub Kicinski wrote: > Remove CAIF (Communication CPU to Application CPU Interface), the > ST-Ericsson modem protocol. The subsystem has been orphaned since 2013. > The last meaningful changes from the maintainers were in March 2013: > a8c7687bf216 ("caif_virtio: Check that vringh_config is not null") > b2273be8d2df ("caif_virtio: Use vringh_notify_enable correctly") > 0d2e1a2926b1 ("caif_virtio: Introduce caif over virtio") > > Not-so-coincidentally, according to "the Internet" ST-Ericsson officially > shut down its modem joint venture in Aug 2013. > > If anyone is using this code please yell! > > In the 13 years since, the code has accumulated 200 non-merge commits, > of which 71 were cross-tree API changes, 21 carried Fixes: tags, and > the remaining ~110 were cleanups, doc conversions, treewide refactors, > and one partial removal (caif_hsi, ca75bcf0a83b). > > We are still getting fixes to this code, in the last 10 days there were > 3 reports on security@ about CAIF that I have been CCed on. > > UAPI constants (AF_CAIF, ARPHRD_CAIF, N_CAIF, VIRTIO_ID_CAIF) and the > SELinux classmap entry are intentionally kept for ABI stability. > > Signed-off-by: Jakub Kicinski > --- > I think we should accumulate such patches over the coming days on a separate > branch. CAIF is a no-brainer IMO but other removals may be more controversial. Acked-by: Greg Kroah-Hartman