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=-9.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 BE8B8C433DF for ; Sun, 12 Jul 2020 08:59:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 932BF2070B for ; Sun, 12 Jul 2020 08:59:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="et8c4srf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727777AbgGLI7b (ORCPT ); Sun, 12 Jul 2020 04:59:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725765AbgGLI7a (ORCPT ); Sun, 12 Jul 2020 04:59:30 -0400 Received: from mail-io1-xd44.google.com (mail-io1-xd44.google.com [IPv6:2607:f8b0:4864:20::d44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08E66C061794; Sun, 12 Jul 2020 01:59:30 -0700 (PDT) Received: by mail-io1-xd44.google.com with SMTP id v8so10415484iox.2; Sun, 12 Jul 2020 01:59:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:reply-to:from:date:message-id :subject:to:cc:content-transfer-encoding; bh=+Dl8Q1XzZiYA4GO8ZZtoY/mYTNvNLG4yL/TSgXjOVXM=; b=et8c4srf7jKz/ghq6ldgJw1wpsajAh/iicKsgGLSk5HCxGZ5CQ86IFUST3G/dAZS9R BK+JEehQthnnir07FeiPcL/qpVUZ2NGCyUjND9byzvK8PnixOnaWkF96m/M5kUymOL2C LII6vqDG01OkywVTUDEiMrt1QcYjd+y6es/0VA01BLEP3VrfKh/wxRZhab4S/+5xDWOB xe88vsXrHJ2oYLtwubG993g1CAsa5aM8/V0M7++JN1XNtMqDZiEmh7FXGrho8fAIGKiT KJW0LpTSPQuedYjKrMO8KvYmRECOyDbXavBRUCJEaU4kO1PGAriZ+FRdd/Me8DIzlfab p9uA== 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:reply-to :from:date:message-id:subject:to:cc:content-transfer-encoding; bh=+Dl8Q1XzZiYA4GO8ZZtoY/mYTNvNLG4yL/TSgXjOVXM=; b=CafyuPnaQWggO8PEixrRbkVAkgjZD8f+UkmoKcWcFsIIRaq3RLpP5cwWOhMKEYh4g8 7WxtNI9ca8lHQjl1ja7ble2ASNCYrAXjbMY4EDJhmkYKvfYZ+opVMil8K3MAJ4AUxtp1 ThSji8sFkAuCrCmuoI8SKYA/MUZ2lYLZJbG3fCmkC6CJnX22aAki8TujsHHuyKuqXE1c JGVxO18dDrfMHjtyX9YzEM/x6A0CS15REVPqzvxL5SpXT2NINXroaR5kuuPEZs3Ssa+8 O7GUgeZZ30hY3jNuXo92vW3anwL6vy/EqoGatulaOuTz3X2ABz27nuyd2vdbcj1sbCZT HGQg== X-Gm-Message-State: AOAM5327tf9z0the4zjHMjxdw8A4JgjbiCsSC1ieJkvlNQ9WMeswB739 cjSsXZ8h9jX9FML4QC/xNOGhWU2wnuT4JxOdrLw= X-Google-Smtp-Source: ABdhPJz6yajbht8v21aUb5AqbeseJZbW7WiEMt9+Xzj6unIHhgR9p8E/p5dg9MyRRh3U33wQNCR5IYqWyZHeGZXnsKY= X-Received: by 2002:a05:6602:1555:: with SMTP id h21mr6773338iow.163.1594544369052; Sun, 12 Jul 2020 01:59:29 -0700 (PDT) MIME-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> <671d8923-ed43-4600-2628-33ae7cb82ccb@molgen.mpg.de> In-Reply-To: <671d8923-ed43-4600-2628-33ae7cb82ccb@molgen.mpg.de> Reply-To: sedat.dilek@gmail.com From: Sedat Dilek Date: Sun, 12 Jul 2020 10:59:17 +0200 Message-ID: Subject: Re: [PATCH 00/22] add support for Clang LTO To: Paul Menzel Cc: Sami Tolvanen , Masahiro Yamada , Will Deacon , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , Clang-Built-Linux ML , kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Sat, Jul 11, 2020 at 6:32 PM Paul Menzel wrote: > > Dear Sami, > > > Am 24.06.20 um 22:31 schrieb Sami Tolvanen: > > This patch series adds support for building x86_64 and arm64 kernels > > with Clang's Link Time Optimization (LTO). > > > > In addition to performance, the primary motivation for LTO is to allow > > Clang's Control-Flow Integrity (CFI) to be used in the kernel. Google's > > Pixel devices have shipped with LTO+CFI kernels since 2018. > > > > Most of the patches are build system changes for handling LLVM bitcode, > > which Clang produces with LTO instead of ELF object files, postponing > > ELF processing until a later stage, and ensuring initcall ordering. > > > > Note that first objtool patch in the series is already in linux-next, > > but as it's needed with LTO, I'm including it also here to make testing > > easier. > > [=E2=80=A6] > > Thank you very much for sending these changes. > > Do you have a branch, where your current work can be pulled from? Your > branch on GitHub [1] seems 15 months old. > Agreed it's easier to git-pull. I have seen [1] - not sure if this is the latest version. Alternatively, you can check patchwork LKML by searching for $submitter. ( You can open patch 01/22 and download the whole patch-series by following the link "series", see [3]. ) - Sedat - [1] https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.= git/log/?h=3Dlto [2] https://lore.kernel.org/patchwork/project/lkml/list/?series=3D&submitte= r=3D19676 [3] https://lore.kernel.org/patchwork/series/450026/mbox/