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=-16.6 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL autolearn=ham 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 1F651C433E1 for ; Sat, 15 Aug 2020 00:27:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EFEC520838 for ; Sat, 15 Aug 2020 00:27:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="M/ugSCNe" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728082AbgHOA1I (ORCPT ); Fri, 14 Aug 2020 20:27:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45324 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726270AbgHOA1I (ORCPT ); Fri, 14 Aug 2020 20:27:08 -0400 Received: from mail-pj1-x1042.google.com (mail-pj1-x1042.google.com [IPv6:2607:f8b0:4864:20::1042]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A5104C061385 for ; Fri, 14 Aug 2020 17:27:07 -0700 (PDT) Received: by mail-pj1-x1042.google.com with SMTP id c6so5161338pje.1 for ; Fri, 14 Aug 2020 17:27:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=eA5hkX4xNHxWO40Nw1BpR0B/AOSewL7fvL2/Um1m3Y0=; b=M/ugSCNeEw1bgnvQXIIfjgjhi0yKsyi9jT4UmSnxjC0YgCw2XN9gnkTrvUhKfdDvvt UqV/mq8EYHdbAlcwp2ycvJ1gKqShE72oxGG0f62cW1STt8tBl+PAjDwEbwPstSbcV/MK O6n+A6fnH9WIgV/k/AXSx8QlUR9kA15fpjjuIdqgrvPXrtCfCPRe9b5eHgzptdUuEGmz cxwVZsUUPQ0yJnpwuUPJjTc6GPJB5jC6SRy3ZuU4/TsyQmlAU4/i4BiWYseLnHq2r7b/ db1rIiLrUaR8vKPVt1iwoCFIu1dsWQIgXUZHyl7AQuSdhPV9OCyuN4HMz9ahuUVtFbnM jQ0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=eA5hkX4xNHxWO40Nw1BpR0B/AOSewL7fvL2/Um1m3Y0=; b=uOinVPYjXn82SbzOAct+qLVC0HYacmX4Wi/fbQ+dlpV6yCWmNJVIh9PQZ3V0UFRd9s pttBRey3xMWWArzKUfusHNsT+JEyz9zuHpDq3EUm95BBmj7ZMGh53XZKqc9uNqPSvStb MBmUCcW07FZkpRxck/bS7dRfOOkhWb4N7gxnTGzLIkpg00CkRSHSXChU3T2twa1kWCTD yiGDNVV//m0K0VcSMMeOcP6CwM3GeNx3ZpB/hYbLfM/dADTY4UlFE1sCxcNImQ6VpM88 YXAzjciF0BrSwBrAFZCsGXgMgmlcJUUzlXDrXX/V+fEootTTDCmer9b8D2Omf5vv/2eZ s9sw== X-Gm-Message-State: AOAM533vLPPREUtZq3QQ44n19413o9ITD/8dFab+Eazi3vGay11H2d5s /1/1K3IqA7tnKgTEYPNwO3hHhMnO8AmUTqAi8DynIQ== X-Google-Smtp-Source: ABdhPJxdy4O7cKwu/Cvva3uOWGTlVbJ6L9UubBasY66c4GLooGqAmS0ND8ujhqMASQvYzOWUVc/CEXscWWeZgl1pam0= X-Received: by 2002:a17:90a:fc98:: with SMTP id ci24mr4260629pjb.101.1597451227000; Fri, 14 Aug 2020 17:27:07 -0700 (PDT) MIME-Version: 1.0 References: <20200527135329.1172644-1-arnd@arndb.de> In-Reply-To: From: Nick Desaulniers Date: Fri, 14 Aug 2020 17:26:55 -0700 Message-ID: Subject: Re: [PATCH] x86: work around clang IAS bug referencing __force_order To: Sedat Dilek Cc: Arnd Bergmann , Peter Collingbourne , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "H. Peter Anvin" , "Kirill A. Shutemov" , Zhenzhong Duan , Kees Cook , Peter Zijlstra , Juergen Gross , Andy Lutomirski , Andrew Cooper , LKML , clang-built-linux Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 14, 2020 at 3:57 PM Nick Desaulniers wrote: > > On Fri, Aug 14, 2020 at 2:19 PM Sedat Dilek wrote: > > > > On Fri, Aug 14, 2020 at 7:29 PM Sedat Dilek wrote: > > > > > > Thanks for the proposal. > > > > > > I have adapted it to fit my patchset against Linux v5.8. > > > > > > Both Debian's GCC-10 and a snapshot version of LLVM toolchain > > > v11.0.0-rc1+ seems to be OK. > > > > > > > Yupp, OK. > > > > I was able to boot FreeDOS 1.2 VM in VirtualBox GUI. > > Hi Sedat, > Apologies, but it's not clear to me precisely which patch you tested. > Can you please confirm whether you tested: > 1. Arnd's patch that started this thread. > 2. My proposed diff adding -fno-addrsig to CFLAGS_powernow-k6.o. > 3. My proposed diff removing __force_order from the kernel. > > I'm hoping you were referring to testing 3., but it's not clear to me. Ah, sorry, I missed your comment on github: https://github.com/ClangBuiltLinux/linux/issues/1120#issuecomment-674282107 Ok, I will look at more disassembly next week and hopefully have a patch ready, with your tested by tag. -- Thanks, ~Nick Desaulniers