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=-15.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 83465C4338F for ; Wed, 11 Aug 2021 23:10:13 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 666376104F for ; Wed, 11 Aug 2021 23:10:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 666376104F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4GlQX12Nw3z3cRQ for ; Thu, 12 Aug 2021 09:10:09 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=molgen.mpg.de (client-ip=141.14.17.11; helo=mx1.molgen.mpg.de; envelope-from=pmenzel@molgen.mpg.de; receiver=) Received: from mx1.molgen.mpg.de (mx3.molgen.mpg.de [141.14.17.11]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4GlQWT4WQfz30F3 for ; Thu, 12 Aug 2021 09:09:38 +1000 (AEST) Received: from [192.168.0.2] (ip5f5aeb94.dynamic.kabel-deutschland.de [95.90.235.148]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id DE19661E5FE33; Thu, 12 Aug 2021 01:09:30 +0200 (CEST) Subject: Re: clang/ld.lld build fails with `can't create dynamic relocation R_PPC64_ADDR64 against local symbol in readonly segment` To: Christophe Leroy , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras References: <77a69755-5291-285c-45be-c1e42423fddc@molgen.mpg.de> <886ac4a5-ad30-b27f-0b80-ec233c571e81@csgroup.eu> From: Paul Menzel Message-ID: Date: Thu, 12 Aug 2021 01:09:31 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <886ac4a5-ad30-b27f-0b80-ec233c571e81@csgroup.eu> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Derek Parker , Dmitrii Okunev , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Dear Christophe, Am 11.08.21 um 16:10 schrieb Christophe Leroy: > Le 10/08/2021 à 20:38, Paul Menzel a écrit : >> Am 29.07.21 um 10:23 schrieb Paul Menzel: >> >>> I just wanted to make you aware that building Linux for ppc64le with >>> clang/lld.ld fails with [1]: >>> >>>      ld.lld: error: can't create dynamic relocation R_PPC64_ADDR64 >>> against symbol: empty_zero_page in readonly segment; recompile object >>> files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in >>> the output >>>      >>> defined in arch/powerpc/kernel/head_64.o >>>      >>> referenced by >>> arch/powerpc/kernel/head_64.o:(___ksymtab+empty_zero_page+0x0) >>> >>> The patch below from one of the comments [2] fixes it. >>> >>> --- i/arch/powerpc/Makefile >>> +++ w/arch/powerpc/Makefile >>> @@ -122,7 +122,7 @@ cflags-$(CONFIG_STACKPROTECTOR)     += >>> -mstack-protector-guard-reg=r2 >>>   endif >>> >>>   LDFLAGS_vmlinux-y := -Bstatic >>> -LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie >>> +LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie -z notext >>>   LDFLAGS_vmlinux        := $(LDFLAGS_vmlinux-y) >>>   LDFLAGS_vmlinux += $(call ld-option,--orphan-handling=warn) >> >> Any comments, if this is the right fix? Current Linux master branch >> still fails to build with `LLVM=1` on Ubuntu 21.04 without this change. > > Which kernel version are you building ? > > Since > https://github.com/linuxppc/linux/commit/45b30fafe528601f1a4449c9d68d8ebe7bbc39ad > , empty_zero_page[] is in arch/powerpc/mm/mem.c not in > arch/powerpc/kernel/head_64.o > > Do you still have the issue with kernel 5.14 ? Yes, before sending the message, I reproduced it with $ git describe v5.14-rc5-2-g9a73fa375d58 containing the commit you mentioned. Kind regards, Paul