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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 98154C388F3 for ; Sat, 28 Sep 2019 05:55:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 61F2620830 for ; Sat, 28 Sep 2019 05:55:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569650116; bh=zeKjhwCf7GhFCQgmig2FZlvYJ1HcAhDSb8kElWZk5Dg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=ce3LlP5H8q5KwJ0/SjlU49uXTrkWszq4v/qlZOhwSNi+rc94NVjayO6XwlWx11lCW sdgDKI5miM/Sf5V5SvT6qMiubwWyYYijQlDLli1doGGvfumznSgkhPyPKV/3Gk9Uzz uIR2e+Y2Wsn3fy7XHt7lHbneKvCCpPUNrbQ/Etbc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725999AbfI1FzP (ORCPT ); Sat, 28 Sep 2019 01:55:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:58126 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725856AbfI1FzP (ORCPT ); Sat, 28 Sep 2019 01:55:15 -0400 Received: from localhost (unknown [77.137.89.37]) (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 CC1392081B; Sat, 28 Sep 2019 05:55:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569650114; bh=zeKjhwCf7GhFCQgmig2FZlvYJ1HcAhDSb8kElWZk5Dg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=dcKEwv8PkXVI9zPT2rZUhxr6ReouabFfsAzpj3BmQM2sPMLDooIg7m4oTG9Tia4L8 huM4AVHClVJK2wbD2uJXOnS5xlBL4oEypi6AB1nvOLshOJkSp5tkNK6bQuAtNAx1mL V8Kfc8cGv7g/B/r7/aVyE6e+/Q1+4gfNJp52LacA= Date: Sat, 28 Sep 2019 08:55:11 +0300 From: Leon Romanovsky To: Doug Ledford Cc: "gregkh@linuxfoundation.org" , "Saleem, Shiraz" , "Kirsher, Jeffrey T" , "jgg@mellanox.com" , "netdev@vger.kernel.org" , "linux-rdma@vger.kernel.org" Subject: Re: [RFC 20/20] RDMA/i40iw: Mark i40iw as deprecated Message-ID: <20190928055511.GI14368@unreal> References: <20190926164519.10471-1-jeffrey.t.kirsher@intel.com> <20190926164519.10471-21-jeffrey.t.kirsher@intel.com> <20190926174009.GD14368@unreal> <9DD61F30A802C4429A01CA4200E302A7AC702BDA@fmsmsx123.amr.corp.intel.com> <20190926195517.GA1743170@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Fri, Sep 27, 2019 at 04:17:15PM -0400, Doug Ledford wrote: > On Thu, 2019-09-26 at 21:55 +0200, gregkh@linuxfoundation.org wrote: > > On Thu, Sep 26, 2019 at 07:49:44PM +0000, Saleem, Shiraz wrote: > > > > Subject: Re: [RFC 20/20] RDMA/i40iw: Mark i40iw as deprecated > > > > > > > > On Thu, Sep 26, 2019 at 09:45:19AM -0700, Jeff Kirsher wrote: > > > > > From: Shiraz Saleem > > > > > > > > > > Mark i40iw as deprecated/obsolete. > > > > > > > > > > irdma is the replacement driver that supports X722. > > > > > > > > Can you simply delete old one and add MODULE_ALIAS() in new > > > > driver? > > > > > > > > > > Yes, but we thought typically driver has to be deprecated for a few > > > cycles before removing it. > > > > If you completely replace it with something that works the same, why > > keep the old one around at all? > > > > Unless you don't trust your new code? :) > > I have yet to see, in over 20 years of kernel experience, a new driver > replace an old driver and not initially be more buggy and troublesome > than the old driver. It takes time and real world usage for the final > issues to get sorted out. During that time, the fallback is often > necessary for those real world users. How many real users exist in RDMA world who run pure upstream kernel? Thanks > > -- > Doug Ledford > GPG KeyID: B826A3330E572FDD > Fingerprint = AE6B 1BDA 122B 23B4 265B 1274 B826 A333 0E57 2FDD