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=-8.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable 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 8F094C433F8 for ; Tue, 14 Jul 2020 12:18:22 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 437102068F for ; Tue, 14 Jul 2020 12:18:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="SVi1OlvW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 437102068F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=IVJZr0I9fH2fXa7QEqbBFTU0iRweoVc3yeEPYBXdfCo=; b=SVi1OlvWL3jCsRNasU66T0eBD iBtgyYizClSD5LAvDKzXSrNJ++q5wHz46jXXF03yAdsBjkr4FyBWMA7uHxBjUntRh+9iHAMr0TBbR w4HqKI6SelfFf81cNRY4Ap9baagcuBXBLN1aw9poK8rJax4YlGj9DI10lnmuTmDOte5af21XUnxeP fdpN2ivDzEqxG51eCpBfmIBia6A2QG5UD/NrpT9BZ4YNAg+nkNONnyfi1aVKX0v05sa4IYp+dYozt pdC+zPd+TzdhaIn8B03tGjxg/fkIpdFhgxw/7ndoPD9Q/bx5FwnTHNX7QpKrv/bR21RifAFv1l2Q4 DSKZ9YgFA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jvJrp-0007kh-D9; Tue, 14 Jul 2020 12:17:01 +0000 Received: from mx3.molgen.mpg.de ([141.14.17.11] helo=mx1.molgen.mpg.de) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jvJrm-0007iT-QW for linux-arm-kernel@lists.infradead.org; Tue, 14 Jul 2020 12:16:59 +0000 Received: from [192.168.0.4] (ip5f5af29b.dynamic.kabel-deutschland.de [95.90.242.155]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id B7E0220643C4C; Tue, 14 Jul 2020 14:16:44 +0200 (CEST) Subject: Re: [PATCH 00/22] add support for Clang LTO To: Sami Tolvanen References: <20200624203200.78870-1-samitolvanen@google.com> <671d8923-ed43-4600-2628-33ae7cb82ccb@molgen.mpg.de> From: Paul Menzel Message-ID: <2ac9e722-949b-aa92-3553-df1bf69bf9e5@molgen.mpg.de> Date: Tue, 14 Jul 2020 14:16:44 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200714_081658_974290_4BC9544C X-CRM114-Status: GOOD ( 21.98 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, x86@kernel.org, Kees Cook , "Paul E. McKenney" , Kernel Hardening , Greg Kroah-Hartman , Masahiro Yamada , linux-kbuild , Nick Desaulniers , LKML , clang-built-linux@googlegroups.com, linux-pci@vger.kernel.org, Will Deacon , linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Dear Sami, Am 13.07.20 um 01:34 schrieb Sami Tolvanen: > On Sat, Jul 11, 2020 at 9:32 AM Paul Menzel wrote: >> 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. > > The clang-lto branch is rebased regularly on top of Linus' tree. > GitHub just looks at the commit date of the last commit in the tree, > which isn't all that informative. Thank you for clearing this up, and sorry for not checking myself. >> Out of curiosity, I applied the changes, allowed the selection for i386 >> (x86), and with Clang 1:11~++20200701093119+ffee8040534-1~exp1 from >> Debian experimental, it failed with `Invalid absolute R_386_32 >> relocation: KERNEL_PAGES`: > > I haven't looked at getting this to work on i386, which is why we only > select ARCH_SUPPORTS_LTO for x86_64. I would expect there to be a few > issues to address. > >>> arch/x86/tools/relocs vmlinux > arch/x86/boot/compressed/vmlinux.relocs;arch/x86/tools/relocs --abs-relocs vmlinux >>> Invalid absolute R_386_32 relocation: KERNEL_PAGES > > KERNEL_PAGES looks like a constant, so it's probably safe to ignore > the absolute relocation in tools/relocs.c. Thank you for pointing me to the right direction. I am happy to report, that with the diff below (no idea to what list to add the string), Linux 5.8-rc5 with the LLVM/Clang/LTO patches on top, builds and boots on the ASRock E350M1. ``` diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c index 8f3bf34840cef..e91af127ed3c0 100644 --- a/arch/x86/tools/relocs.c +++ b/arch/x86/tools/relocs.c @@ -79,6 +79,7 @@ static const char * const sym_regex_kernel[S_NSYMTYPES] = { "__end_rodata_hpage_align|" #endif "__vvar_page|" + "KERNEL_PAGES|" "_end)$" }; ``` Kind regards, Paul _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel