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 1F5DD3CAE61 for ; Wed, 22 Apr 2026 10:48:16 +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=1776854897; cv=none; b=mrktqVhdh28Oqa6GAYcMrNrviRgihG3DLxA+Ri8r6tlNBbJWV/o3kLv76Iz/kGdNiVIjm+ZdvQxlvAEHd0mZC8nDWFVF/xH35y6vwqremX03GAsBSNN4zXO+r2MuWpCHSmTTuKy4bGhSHTMtXE+TID2YFynOizYBZUchLaH4nXg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776854897; c=relaxed/simple; bh=6mQ5LyQB4fRfCoB0R+sQQG1+3BTD84pOGcxptMUQH+8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=AXq0aGmpgW5hZFTscRvwx0LHB97AhPWQwGqRoJvLQF06CTURazFSBUnYA+ZdXDCt+cEaoHiWppHnQIhVnMSSRDwPvtrbWarEYUWb5Q0ufQOqOQggwn0hK2UAvw0IfPNecQ6ZWEWCNjoJxdPyUSWTJqbZAANhClCghU3gCh+Bhw4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SoQZstCl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="SoQZstCl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 88F0DC19425; Wed, 22 Apr 2026 10:48:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776854896; bh=6mQ5LyQB4fRfCoB0R+sQQG1+3BTD84pOGcxptMUQH+8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=SoQZstClHLhnHdwrCNUO85JgbXi82BhXuvlv3zmPM+PubBOBI5anpVsaj8E8Ij5j8 HkS+NfxqVRkDZnuoCyJcIRkMA08L1YU9kbex0wreKDBEVi9+rLVT+/+98nJGb9yepW +EbXKyQJlNfj4ZWBG5U3kvbyJNOzKAWJX36UQxrkSGSoCntW3Cjqh+DCYSfL9XpFWI n4ou976kzwMGAf9oGldQ+zQ4eFhF6YD6sKAfN7g6kURRUlB+O5qlmMvzOsrSg9eQs7 Rk0g6/xXeDhCkbv1PO25bx80Fu8dwUBO9UkECDpi/lBKI1C7RyNfMRaa09Aw+8oVqP qS20PkpIm5dKA== Date: Wed, 22 Apr 2026 11:48:06 +0100 From: Simon Horman To: Jakub Kicinski Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, 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, gregkh@linuxfoundation.org Subject: Re: [PATCH net-deletions] caif: remove CAIF NETWORK LAYER Message-ID: <20260422104806.GL651125@horms.kernel.org> 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. Reviewed-by: Simon Horman