From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F190DC352A1 for ; Wed, 5 Feb 2020 21:48:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C80F72082E for ; Wed, 5 Feb 2020 21:48:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580939325; bh=K3Mf2VeQzDqsXQu1EcL5B2wRuNRDAhk8NnH+B7vcCbU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=uSbDb1VlA74ameWm8jOvLBB6O678dIFH/SD8E5BD3NTfO46nlmOpNpX8lsgX4X9Bs U3GWGvRsex6/PDzQKAJFb6OboIpcHwMiIxQjZpu4Mb5a8UUpoBIKMQHgzXVsuPnSvw Va37r2Fb0nWRNsNw/74oARMEKyQTPQZSs5uTqeCE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727457AbgBEVsp (ORCPT ); Wed, 5 Feb 2020 16:48:45 -0500 Received: from mail.kernel.org ([198.145.29.99]:47188 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727033AbgBEVso (ORCPT ); Wed, 5 Feb 2020 16:48:44 -0500 Received: from localhost (unknown [193.117.204.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3AC8E2072B; Wed, 5 Feb 2020 21:48:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580939323; bh=K3Mf2VeQzDqsXQu1EcL5B2wRuNRDAhk8NnH+B7vcCbU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=G0+cEz8+4eUrsKreHwn3BDkM5aWY/5o1vdeyEiiEEdYn1XNedcscTzFPoBr1MstVa VDocPYRGWFyDU9Jipg2Ilw5FKeTnUBX638JUlZuIoJ/N0WWNLHXsVghx2yLbdsVAD6 hJekY1vsCTYSzwk1wAviPum3hKjBMrcOSQZOgR+8= Date: Wed, 5 Feb 2020 21:48:41 +0000 From: Greg Kroah-Hartman To: Joel Fernandes Cc: Olof Johansson , Alexei Starovoitov , Masahiro Yamada , Michal Marek , Jonathan Corbet , Thomas Gleixner , Tejun Heo , Mauro Carvalho Chehab , David Howells , Patrick Bellasi , Krzysztof Kozlowski , linux-kbuild@vger.kernel.org, "open list:DOCUMENTATION" , Linux Kernel Mailing List Subject: Re: [PATCH] Revert kheaders feature Message-ID: <20200205214841.GB1468203@kroah.com> References: <20200205154629.GA1257054@kroah.com> <20200205160250.GG142103@google.com> <20200205171353.GI142103@google.com> <20200205213354.GB1465126@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Feb 05, 2020 at 01:35:56PM -0800, Joel Fernandes wrote: > On Wed, Feb 5, 2020 at 1:33 PM Greg Kroah-Hartman > wrote: > [snip] > > > > like the BTF approach is significantly better and said users are > > > > hopefully moving forward to it quickly, and if they can't move > > > > forward, then they're likely also not going to move forward to newer > > > > kernels either? > > > > > > I think BCC runs on a lot of upstream machines. I think the migration > > > strategy is a matter of opinion, one way is to take it out and cause some > > > pain in the hope that users/tools will migrate soon (while probably carrying > > > the reverted patches out of tree). Another is to migrate the tools first and > > > then take it out (which has its own disadvantages such as introducing even > > > more users of it while it is still upstream). > > > > Do we "know" what tools today require this, and what needs to be done to > > "fix" them? If we don't know that, then there's no way to drop this, > > pretty much ever :( > > Is there a real reason to drop it or a problem dropping this solves though? Olof had some reasons, but as we were drinking at the time when it came up last night, I can't really remember them specifically. Hopefully he does :) But that didn't answer my question of "who is still using this"? I was hoping we actually knew this given it was created for specific users. thanks, greg k-h