Received: by 2002:a05:6a10:8c0a:0:0:0:0 with SMTP id go10csp26211pxb; Fri, 19 Feb 2021 16:43:15 -0800 (PST) X-Google-Smtp-Source: ABdhPJyf/Efh+lu3AIMmfbWOt0ULK9IapSfugEvJAeMD29eNsym+e3rFrW0+PSI9C7R+PlB5UupB X-Received: by 2002:a17:906:2747:: with SMTP id a7mr11428616ejd.250.1613781795399; Fri, 19 Feb 2021 16:43:15 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1613781795; cv=none; d=google.com; s=arc-20160816; b=nKybUDWNCsZqAhxXyQxL8MsPXzlJ1GDoUeRYhtW/yy9NU6tbWdiuBJYUyGJ5DaMGJ8 nuMK//4jNFlpb5E/PUZdTxHb2LLb7O0REn6cKwPhSuvnf/MevFxsYZMTa8dXtrXdxrbq Kkq36OZ3QEP56ga2cOTfhB484jJ0yScc+3qEUCIRw1cYW+OTruWX6NhCXbusMkUwgqMB OiojmaG2VJ9Mh5gtJ/bfygfmpPgyjer2HYSu1c/N0/v+/vPDRGs5ZfN3Vml2aiAaRbQ3 pmRVef+AwrtwXynun5UUk8rzuIbIecMUxxZcHsTyzb6NjCX5/+RRNhYcu719A6J0Qkvu xWyQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=xCS74TGIVlHffee6XsxWByYzoIpChbExKS5f7fUQKNw=; b=KMXYZJYThwRp4DQU6RIE7Gh9ZyPwzYc+yQf3jVYNyLg399Dhzo0TsCZrwwmzhYJ1+m Se75YIbqLuwTGPcx/7MN4Ig4g2DtOViEnw03IT9+99ha/iKwExEBLwd/CbgAJYVV7IAf H/8O3G0nGQ08T0Dxd4rV5HczWKy1jXMAM12vwLm2YcpSzzz5ghI4U6wJ7BkpO3EsHyKT UFOImbN9K3m/QSRFeAYEOumC2t9BVsMam30QpY5HiGiPFICTXHqlFwXFMWP+m0TglWQN bSbM6vuSnOEvd2JsNGXjIW53YA7DqiZTz0kxM2j7zsqJ9ZI56Iy1WCEJ2xtWdsMSN6+R BH7w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b=Y9T1ivVB; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id u9si7719870eda.409.2021.02.19.16.42.52; Fri, 19 Feb 2021 16:43:15 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b=Y9T1ivVB; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229722AbhBTAkK (ORCPT + 99 others); Fri, 19 Feb 2021 19:40:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229658AbhBTAkJ (ORCPT ); Fri, 19 Feb 2021 19:40:09 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59FA8C061574 for ; Fri, 19 Feb 2021 16:39:29 -0800 (PST) Received: from zn.tnic (p200300ec2f04670057cd3f2d2693719b.dip0.t-ipconnect.de [IPv6:2003:ec:2f04:6700:57cd:3f2d:2693:719b]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 838821EC041D; Sat, 20 Feb 2021 01:39:25 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1613781565; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=xCS74TGIVlHffee6XsxWByYzoIpChbExKS5f7fUQKNw=; b=Y9T1ivVBGwboZFV4geMWD6qIP1Xope1oMQc47rw0DrBD00QPDju1hPGobArZEA2CD9O1y/ SbUnpHa2vgkpFni8tos9VjT38Q7dgv+zaKBGDhIHZBBCYuiwRpESv9NalJLDmWUUcIjQdw Xt8f77I6MIydcN3qnWREtbHImQByK/g= Date: Sat, 20 Feb 2021 01:39:20 +0100 From: Borislav Petkov To: Peter Zijlstra Cc: Josh Poimboeuf , x86@kernel.org, pjt@google.com, mbenes@suze.cz, jgross@suse.com, linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH 6/6] objtool,x86: Rewrite retpoline thunk calls Message-ID: <20210220003920.GG26778@zn.tnic> References: <20210219204300.749932493@infradead.org> <20210219210535.492733466@infradead.org> <20210219215530.ivzzv3oavhuip6un@treble> <20210219220158.GD59023@worktop.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210219220158.GD59023@worktop.programming.kicks-ass.net> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Feb 19, 2021 at 11:01:58PM +0100, Peter Zijlstra wrote: > We could, but it so happens Joerg is also wanting negative features. Juergen. > So I was thikning that perhaps we can convince Boris they're not > really all that aweful after all :-) Well, I'm not crazy about this, TBH - I totally agree with Josh: "with objtool generating code, it's going to be a maze to figure out where the generated code is coming from" and without a real good reason to do this, what's the point? I know, because we can. :-) -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette