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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 DD880C47404 for ; Mon, 7 Oct 2019 16:13:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B14EB20659 for ; Mon, 7 Oct 2019 16:13:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="CE8wQWou" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728533AbfJGQNd (ORCPT ); Mon, 7 Oct 2019 12:13:33 -0400 Received: from merlin.infradead.org ([205.233.59.134]:33310 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727711AbfJGQNd (ORCPT ); Mon, 7 Oct 2019 12:13:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=aONeFDLbBithO73vHYkhDtop/BmMj25yt4UQnRDlml0=; b=CE8wQWouMnSXLBYJT5/GE4GCO /v8P88UHi2eyAO8lqiQwZUp7+NTRxtwHGfxJ3J8+d35Ux1hP5DntKMJGkzgsg4HtNQDmngHesYxhH u1zM7MxmpYJrg3pScZZ/zye8f0MOV/m+oJ1WmYaZ7R2r0tnQRA6ScjjjAu8xBpPziRNBUro3IVuzF tUby1PtGkGdZ/MKcnX49ThYl/ygaEuTXnda+LZgJrcT3BFf1p//ZW1wBUGzh2c3byp2zLEcZDgK5g rWyY8oWbVWdf2WJKP+MPbAQ8CXP6LQLuWiEi5V0PHZLmsp3u4eJaAHwInU4Fwps4s3Xx+kN2lKjv3 tJJlK8erw==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.2 #3 (Red Hat Linux)) id 1iHVdB-0007OM-89; Mon, 07 Oct 2019 16:13:05 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id 1A87E9802D2; Mon, 7 Oct 2019 18:13:02 +0200 (CEST) Date: Mon, 7 Oct 2019 18:13:02 +0200 From: Peter Zijlstra To: Steven Rostedt Cc: Ingo Molnar , x86@kernel.org, linux-kernel@vger.kernel.org, mhiramat@kernel.org, bristot@redhat.com, jbaron@akamai.com, torvalds@linux-foundation.org, tglx@linutronix.de, namit@vmware.com, hpa@zytor.com, luto@kernel.org, ard.biesheuvel@linaro.org, jpoimboe@redhat.com, hjl.tools@gmail.com, Andrew Morton , Borislav Petkov , Denys Vlasenko Subject: Re: [RFC][PATCH 0/9] Variable size jump_label support Message-ID: <20191007161302.GI4643@worktop.programming.kicks-ass.net> References: <20191007090225.441087116@infradead.org> <20191007084443.793701281@infradead.org> <20191007112229.GA3221@gmail.com> <20191007112606.GA44864@gmail.com> <20191007111742.00d6c50b@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191007111742.00d6c50b@gandalf.local.home> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 07, 2019 at 11:17:42AM -0400, Steven Rostedt wrote: > Actually, even back then I said that it would be best to merge all the > tools into one (I just didn't have the time to implement it), and then > we could pull this off. I have one of my developers working to merge > record-mcount into objtool now (there's been some patches floating > around). Right, but while working on this I discovered GCC's -mrecord-mcount (and the kernel using this), so how much do we really still need the record-mcount tool? Do we really only need the tool for the little hole between gcc-4.6 (minimal supported GCC version) and gcc-5 (when -mrecord-mcount was introduced) ?