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=1.3 required=3.0 tests=DKIM_SIGNED,FSL_HELO_FAKE, MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID,USER_AGENT_MUTT 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 B1AA2C3279B for ; Tue, 10 Jul 2018 05:27:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 65A7B2089B for ; Tue, 10 Jul 2018 05:27:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="DoZ8raoK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 65A7B2089B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751232AbeGJF1v (ORCPT ); Tue, 10 Jul 2018 01:27:51 -0400 Received: from mail-wm0-f65.google.com ([74.125.82.65]:53696 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750931AbeGJF1t (ORCPT ); Tue, 10 Jul 2018 01:27:49 -0400 Received: by mail-wm0-f65.google.com with SMTP id b188-v6so23248026wme.3; Mon, 09 Jul 2018 22:27:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=RkINdTTaP58ieF7N2A1pDIHfKFsJP7k2+DlaJ/8I45I=; b=DoZ8raoKka0Vi2cgsPbQBhbW6MebbRH+Jvy+d3RqXqv4c4jwkEn4m4lA1Dx6frBLkm /S1CJm8QeaZYDoD70B+/7WtNU+MndTj1AzEh9U8cqGNPmJzJVt9ec7EvqFp+I7L/wm8V flwE4gJQw0qKSUfnMHTeocP8yAyprBDszTgn9CNYnVSb1ZZqkLxP79eTT1ISZlPsUx9x g8MfyVywOMG3pYc6/ivrxlZQRmAeyNY48mdO8nFUz9sIiRk5pNH7TOn7L2KkJ2q0/67x Wkk03alHnV5BkRNCro82vEA29vsUHItBjus6Q5iMBpoiCPMWoDINfOna/Djl8CPBptRZ 3vMA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=RkINdTTaP58ieF7N2A1pDIHfKFsJP7k2+DlaJ/8I45I=; b=BhKHNb0slZruHLRi3i5j8NzT2KzD9AHoVMyeOJfmA7CYZ2ht4Tdwt4wmu1tgEMbI5K dGfgt7IsB+T7F2NuL00lesuR5e/ffqY5//dzqcjTxtmgBQlRym3EMqVXNEmacacZ7map bBR7bTTT2B88uy2xacp1xuSstiITlAxpzpaqoHyZ+QR7DL5wXq8BMWEJhSitXrqkbS6V eVCm7ESyD7JR17Xt4JCpgum+hWrVPTJIekTtKPrYNiflr29pytnXk4Hve3G7FBAtI4Fn PCjKH7/T5b9nzS5BTcn3P4bK9NtGR8SWGNMN4BT0sBTieX4lkOuSF0dZEbBCZ7PGF23N lo9Q== X-Gm-Message-State: APt69E25Qj2bEx22YUVsVl8gt0NHxu1wHdS4pWiXHuj7MrtdDGDYb8Q8 ZAcMxK151xJGMC3CpvDgjZOVyg== X-Google-Smtp-Source: AAOMgpdReG/rN6aEYE9eY8/Oe3tQIq2Cfwwe1J20K6P3Z7Dnkaemz0BT5NLoK0Injhp1DVkfDrjkJg== X-Received: by 2002:a1c:cf81:: with SMTP id f123-v6mr14575783wmg.3.1531200468279; Mon, 09 Jul 2018 22:27:48 -0700 (PDT) Received: from gmail.com (2E8B0CD5.catv.pool.telekom.hu. [46.139.12.213]) by smtp.gmail.com with ESMTPSA id s12-v6sm13637108wmc.2.2018.07.09.22.27.47 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 09 Jul 2018 22:27:47 -0700 (PDT) Date: Tue, 10 Jul 2018 07:27:45 +0200 From: Ingo Molnar To: Josh Poimboeuf Cc: Masahiro Yamada , Ingo Molnar , Thomas Gleixner , X86 ML , Linus Torvalds , "H. Peter Anvin" , Linux Kbuild mailing list , Linux Kernel Mailing List , Michal Marek Subject: Re: [PATCH v2] objtool: move libelf detection to Kconfig from Makefile Message-ID: <20180710052745.GA16938@gmail.com> References: <1531186516-15764-1-git-send-email-yamada.masahiro@socionext.com> <20180710022904.e3oql2ts4qz43bzo@treble> <20180710042609.zie5fgrvoyusmeod@treble> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180710042609.zie5fgrvoyusmeod@treble> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Josh Poimboeuf wrote: > Since we switched the x86_64 default to the ORC unwinder, a lot of > people have switched over. But this patch will reverse (or at least > slow down) that trend, because almost nobody has the libelf devel > packaged installed by default. So over time, it will effectively make > frame pointers the default again in many cases. That's exactly what we > *don't* want to do. It will also cause people to accidentally re-enable > frame pointers when they thought they had ORC. Yeah, agreed - turning ORC off like that is a non-starter. Thanks, Ingo