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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 62289C48BD7 for ; Thu, 27 Jun 2019 16:51:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 37360205F4 for ; Thu, 27 Jun 2019 16:51:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561654286; bh=ZJeG6e/5ex7Oi3+NrkGCaYVu2coSPS31gk3u5jQWWjo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=boZ7y7XPKcWLYhZpJjmJ1SXywqRdXEIF5z9k74Uw2KbgXXFP2p+XMb/ZlYy06CWgU z2EzZ5RLA3H4BNL7vZuAW+aJV+anT3+ge7d8cCzrmIRQvHxFeARnqwWmWbp+KwakD0 HMLOLG4Fb8bpX/0SA0DJyh/6hqz7lfHoE28zs3kM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726518AbfF0QvY (ORCPT ); Thu, 27 Jun 2019 12:51:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:43896 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725770AbfF0QvY (ORCPT ); Thu, 27 Jun 2019 12:51:24 -0400 Received: from localhost (unknown [89.205.136.226]) (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 89D8C2054F; Thu, 27 Jun 2019 16:51:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561654283; bh=ZJeG6e/5ex7Oi3+NrkGCaYVu2coSPS31gk3u5jQWWjo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=mZ148xhhRuY36EaSXlOq2p/UuE2/te/REcS9lHEb28ZfBZTo1mpl3owe357ai8X+g dMqgFdvIOf4atRjO1kkZ0Ze2AabPXt4HhkDiO1d16DWrBC6Md2kCSJOOd/tEoUzLqT LKgTrlyB/AduI6aU7BnoiU6rwCqmu2NvJCH7m6oQ= Date: Fri, 28 Jun 2019 00:51:16 +0800 From: Greg Kroah-Hartman To: Alexey Kardashevskiy Cc: Christoph Hellwig , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Oliver O'Halloran , Frederic Barrat , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 3/4] powerpc/powernv: remove unused NPU DMA code Message-ID: <20190627165116.GA9855@kroah.com> References: <20190625145239.2759-1-hch@lst.de> <20190625145239.2759-4-hch@lst.de> <7bde96e0-7bc5-d5fe-f151-52c29660633c@ozlabs.ru> <20190626074935.GA25452@lst.de> <027a5095-a22c-2799-8ff6-42d0bc4d2bc9@ozlabs.ru> <20190627072240.GA9916@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190627072240.GA9916@lst.de> User-Agent: Mutt/1.12.1 (2019-06-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 27, 2019 at 09:22:40AM +0200, Christoph Hellwig wrote: > On Thu, Jun 27, 2019 at 10:21:55AM +1000, Alexey Kardashevskiy wrote: > > > Which comment? Last time I asked you complaint "it is still used in > > > exactly the same way as before" which you later clarified that you > > > have a hidden out of tree user somewhere, and you only objected to > > > > It is not hidden, anyone can download and inspect that GPL driver. > > For one no one has ever posted a link. And second as mentioned > countless times it doesn't matter, it only matters if it is in mainline, > or as a special exception actively trying to go mainline. > > > > the word "dead". That has been fixed and there were no further > > > comments. > > > > You still have it in the cover letter so at very least 3/4 is not a part > > of this patchset then. > > > > And I still want to see a formal statement about out-of-tree drivers > > support/tolerance. If you manage to remove this code, I'll have to post > > a revert (again and again) but I would rather know the exact list of > > what we do and what we do not do about such drivers and if the list 1) > > exists 2) is reasonable then I could try to come up with a better > > solution or point others to the policy and push them to do the right > > thing. Right now it is just you pretending that the nVidia driver does > > not exist, this is not helping. Thanks, > > We had that discussion at kernel summit and it was reported. Anyway, > adding Greg, who usually has some pretty good prewritten letters for > this kind of thing. I used to have one but it's been so long since anyone tried to even think about defending the removal of functions that are not used in the kernel tree anymore, that I can't seem to find it anymore :) Christoph is completely correct here, if it isn't in the tree, it doesn't matter. We have made this "formal" statement again and again over the years, starting with the old "stable api nonsense" document that is in the kernel tree itself. And he is also correct in that we talked about this specific issue, in detail, at the maintainers summit last year, see lwn.net for the details if you somehow missed it then. thanks, greg k-h