From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=xidA=BC=vger.kernel.org=linux-pci-owner@kernel.org>
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,
	URIBL_BLOCKED,USER_AGENT_SANE_2 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 D307BC433E1
	for <linux-pci@archiver.kernel.org>; Thu, 23 Jul 2020 00:06:16 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by mail.kernel.org (Postfix) with ESMTP id B22EA22C9E
	for <linux-pci@archiver.kernel.org>; Thu, 23 Jul 2020 00:06:16 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1731300AbgGWAGM (ORCPT <rfc822;linux-pci@archiver.kernel.org>);
        Wed, 22 Jul 2020 20:06:12 -0400
Received: from mail.kernel.org ([198.145.29.99]:58918 "EHLO mail.kernel.org"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1729423AbgGWAGM (ORCPT <rfc822;linux-pci@vger.kernel.org>);
        Wed, 22 Jul 2020 20:06:12 -0400
Received: from oasis.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 8983C206E3;
        Thu, 23 Jul 2020 00:06:10 +0000 (UTC)
Date:   Wed, 22 Jul 2020 20:06:08 -0400
From:   Steven Rostedt <rostedt@goodmis.org>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Sami Tolvanen <samitolvanen@google.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Will Deacon <will@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        clang-built-linux@googlegroups.com,
        kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
        x86@kernel.org, Josh Poimboeuf <jpoimboe@redhat.com>
Subject: Re: [RFC][PATCH] objtool,x86_64: Replace recordmcount with objtool
Message-ID: <20200722200608.40ca9994@oasis.local.home>
In-Reply-To: <20200722235620.GR10769@hirez.programming.kicks-ass.net>
References: <20200624212737.GV4817@hirez.programming.kicks-ass.net>
        <20200624214530.GA120457@google.com>
        <20200625074530.GW4817@hirez.programming.kicks-ass.net>
        <20200625161503.GB173089@google.com>
        <20200625200235.GQ4781@hirez.programming.kicks-ass.net>
        <20200625224042.GA169781@google.com>
        <20200626112931.GF4817@hirez.programming.kicks-ass.net>
        <20200722135542.41127cc4@oasis.local.home>
        <20200722184137.GP10769@hirez.programming.kicks-ass.net>
        <20200722150943.53046592@oasis.local.home>
        <20200722235620.GR10769@hirez.programming.kicks-ass.net>
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-pci-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-pci.vger.kernel.org>
X-Mailing-List: linux-pci@vger.kernel.org

On Thu, 23 Jul 2020 01:56:20 +0200
Peter Zijlstra <peterz@infradead.org> wrote:

> Anyway, what do you prefer, I suppose I can make objtool whatever we
> need, that patch is trivial. Simply recording the sites and not
> rewriting them should be simple enough.

Either way. If objtool turns it into nops, just make it where we can
enable -DCC_USING_NOP_MCOUNT set, and the kernel will be unaware.

Or if you just add the locations, then that would work too.

-- Steve