Received: by 2002:ac0:b08d:0:0:0:0:0 with SMTP id l13csp4715247imc; Mon, 25 Feb 2019 09:39:45 -0800 (PST) X-Google-Smtp-Source: AHgI3IZVaZRh8eVX37J7YSp7Nye0G5IUzy6boUF4dVu3VCkQp2FTY+MaDpRiAthlCCeqcdIPXHPo X-Received: by 2002:a65:6091:: with SMTP id t17mr20378072pgu.416.1551116384921; Mon, 25 Feb 2019 09:39:44 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1551116384; cv=none; d=google.com; s=arc-20160816; b=sUqgt8J8e9BeSg1qb6EeMG1GpNDbsOKgWUuEWwyfbyy/B6CIOOCQe6q/SYBfnX0obQ Gb78Dx38q8Nai6FGk7Hp2LM3e6eE4e1pkK2KPzsDU4AXFbTK9RJCIk10Veng4wWZlSUb J34QX2yA2S51jPNXbkxeZB/anHUzP0MzwrDmFbfzCei0CX5U5MoFp0SRK5tKEBdQG2Rb 24lF+OhFNUImRtZK6bBJuaU61EvCJBjSf6rpkZAhSZGyEU+awU9qW/198LGhOc9gcDR6 4cPX/f/KoU4PpYT8lT4L6Hq7uN/ZJtK+nXYhps+PzTiX0nzbgpRBKRW6gPB3MPa74D8i 1sDQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=Wuj/yfZM7aXXbx2Y3djduxjaLUEA7gdPgiWJ0tWqilo=; b=onfkKjuB9q6k0R27Ib0JI0SXHVaOJ3wwPM2VYTvTgJ4tBeJ1mJrmRdEoo1vQrnYWIP RodLhugA8JQoKt+13YWNAc5iIA34Aj0Ny+w5Ba3IhJ/4TWF+wlbdV5wlq2n//zwUUsNe BdIi0EZnZLopm/hiCudklrFVAljIV7O6tRir9yCKWeSlbHH0af6N3PANDrpGl6xHoRie qphT/RB5x8ztyQ7XN1bbOXvjTFekC32Y/H8Mij24kjJ3N9RWd6czLU/z34w0k58cxQUP ODMQQw3jCq8PzsQ8KZEqX7+9o5a0+9KqAYZsyqwAw/OAYoMeXgPKB24lzU7di/Yc/Iwc I/lA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id j4si10059815pgc.186.2019.02.25.09.39.29; Mon, 25 Feb 2019 09:39:44 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727107AbfBYRjG (ORCPT + 99 others); Mon, 25 Feb 2019 12:39:06 -0500 Received: from mx1.redhat.com ([209.132.183.28]:58034 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726881AbfBYRjG (ORCPT ); Mon, 25 Feb 2019 12:39:06 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2B5E613A63; Mon, 25 Feb 2019 17:39:06 +0000 (UTC) Received: from treble (ovpn-120-232.rdu2.redhat.com [10.10.120.232]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B4EB35C22B; Mon, 25 Feb 2019 17:39:01 +0000 (UTC) Date: Mon, 25 Feb 2019 11:38:59 -0600 From: Josh Poimboeuf To: Peter Zijlstra Cc: Andy Lutomirski , Linus Torvalds , Thomas Gleixner , "H. Peter Anvin" , Julien Thierry , Will Deacon , Ingo Molnar , Catalin Marinas , James Morse , valentin.schneider@arm.com, Brian Gerst , Andrew Lutomirski , Borislav Petkov , Denys Vlasenko , LKML Subject: Re: [PATCH 5/6] objtool: Add UACCESS validation Message-ID: <20190225173859.zs5k5bbkdruqk6pa@treble> References: <20190225124330.613028745@infradead.org> <20190225125232.191698923@infradead.org> <20190225161234.GM32477@hirez.programming.kicks-ass.net> <20190225171531.GD32534@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190225171531.GD32534@hirez.programming.kicks-ass.net> User-Agent: NeoMutt/20180716 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Mon, 25 Feb 2019 17:39:06 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Feb 25, 2019 at 06:15:31PM +0100, Peter Zijlstra wrote: > Also, I think at the time we didn't use it because backporting efforts. This part may have been my fault. I spread a vicious rumor (based on reading docs instead of code) that old versions of GCC don't support '%='. But it's actually been around since GCC 2.8. -- Josh