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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,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 10E43C433E0 for ; Thu, 16 Jul 2020 11:20:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DB42F2074B for ; Thu, 16 Jul 2020 11:20:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728110AbgGPLUw (ORCPT ); Thu, 16 Jul 2020 07:20:52 -0400 Received: from mx2.suse.de ([195.135.220.15]:59204 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727118AbgGPLUw (ORCPT ); Thu, 16 Jul 2020 07:20:52 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C15ACACB8; Thu, 16 Jul 2020 11:20:54 +0000 (UTC) Date: Thu, 16 Jul 2020 13:20:50 +0200 (CEST) From: Miroslav Benes To: Josh Poimboeuf cc: Petr Mladek , Randy Dunlap , Stephen Rothwell , Linux Next Mailing List , Linux Kernel Mailing List , Peter Zijlstra , live-patching@vger.kernel.org, Yannick Cote Subject: Re: linux-next: Tree for Jun 23 (objtool (2)) In-Reply-To: <20200715162457.mhoz2rgjbl4okx6d@treble> Message-ID: References: <20200623162820.3f45feae@canb.auug.org.au> <61df2e8f-75e8-d233-9c3c-5b4fa2b7fbdc@infradead.org> <20200702123555.bjioosahrs5vjovu@treble> <20200714135747.lcgysd5joguhssas@treble> <20200715121054.GH20226@alley> <20200715134155.GI20226@alley> <20200715162457.mhoz2rgjbl4okx6d@treble> User-Agent: Alpine 2.21 (LSU 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: live-patching-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: live-patching@vger.kernel.org On Wed, 15 Jul 2020, Josh Poimboeuf wrote: > On Wed, Jul 15, 2020 at 03:41:55PM +0200, Petr Mladek wrote: > > On Wed 2020-07-15 14:10:54, Petr Mladek wrote: > > > On Wed 2020-07-15 13:11:14, Miroslav Benes wrote: > > > > Petr, would you agree to revert -flive-patching. > > > > > > Yes, I agree. > > > > Or better to say that I will not block it. > > > > I see that it causes maintenance burden. There are questions about > > reliability and performance impact. I do not have a magic solution > > in the pocket. > > > > Anyway, we need a solution to know what functions need to get livepatched. > > I do not have experience with comparing the assembly, so I do not know > > how it is complicated and reliable. > > Thanks Petr/Miroslav. I can do the revert patch. It doesn't have to be > a permanent revert. I'd certainly be willing to ACK it again in the > future if/when it becomes more ready. Ok. > Yannick has agreed to start looking at the objtool function diff > feature. It's purely theoretical at the moment, we'll see how it works > in practice. We already do something similar in kpatch-build -- it > differs from the objtool model, but it at least shows that something > similar is possible. Great. I'm looking forward to seeing that. Thanks Miroslav