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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 3E528C43219 for ; Tue, 30 Apr 2019 17:20:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 15E1F21670 for ; Tue, 30 Apr 2019 17:20:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726952AbfD3RUa (ORCPT ); Tue, 30 Apr 2019 13:20:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:44232 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725942AbfD3RU3 (ORCPT ); Tue, 30 Apr 2019 13:20:29 -0400 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (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 A4B1020651; Tue, 30 Apr 2019 17:20:26 +0000 (UTC) Date: Tue, 30 Apr 2019 13:20:24 -0400 From: Steven Rostedt To: Andy Lutomirski Cc: Linus Torvalds , Peter Zijlstra , Nicolai Stange , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , "the arch/x86 maintainers" , Josh Poimboeuf , Jiri Kosina , Miroslav Benes , Petr Mladek , Joe Lawrence , Shuah Khan , Konrad Rzeszutek Wilk , Tim Chen , Sebastian Andrzej Siewior , Mimi Zohar , Juergen Gross , Nick Desaulniers , Nayna Jain , Masahiro Yamada , Joerg Roedel , Linux List Kernel Mailing , live-patching@vger.kernel.org, "open list:KERNEL SELFTEST FRAMEWORK" Subject: Re: [PATCH 3/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation Message-ID: <20190430132024.0f03f5b8@gandalf.local.home> In-Reply-To: <20190430130359.330e895b@gandalf.local.home> References: <20190428133826.3e142cfd@oasis.local.home> <20190430135602.GD2589@hirez.programming.kicks-ass.net> <20190430130359.330e895b@gandalf.local.home> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 30 Apr 2019 13:03:59 -0400 Steven Rostedt wrote: > I also prefer Josh's stack shift solution, as I personally believe > that's a cleaner solution. But I went ahead and implemented Linus's > version to get it working for ftrace. Here's the code, and it survived > some preliminary tests. Well it past the second level of tests. If this is the way we are going, I could add comments to the code and apply it to my queue and run it through the rest of my test suite and make it ready for the merge window. I may add a stable tag to it to go back to where live kernel patching was added, as it fixes a potential bug there. -- Steve