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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 896E3C433E0 for ; Sat, 9 Jan 2021 12:28:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 542DF23A68 for ; Sat, 9 Jan 2021 12:28:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726315AbhAIM2e (ORCPT ); Sat, 9 Jan 2021 07:28:34 -0500 Received: from elvis.franken.de ([193.175.24.41]:38220 "EHLO elvis.franken.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725896AbhAIM2d (ORCPT ); Sat, 9 Jan 2021 07:28:33 -0500 Received: from uucp (helo=alpha) by elvis.franken.de with local-bsmtp (Exim 3.36 #1) id 1kyDLP-0005En-00; Sat, 09 Jan 2021 13:27:47 +0100 Received: by alpha.franken.de (Postfix, from userid 1000) id 492FAC0880; Sat, 9 Jan 2021 12:12:59 +0100 (CET) Date: Sat, 9 Jan 2021 12:12:59 +0100 From: Thomas Bogendoerfer To: Alexander Lobakin Cc: Arnd Bergmann , Kees Cook , Nathan Chancellor , Nick Desaulniers , Fangrui Song , Huacai Chen , Pei Huang , Jiaxun Yang , Sami Tolvanen , Ingo Molnar , Ralf Baechle , Corey Minyard , linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, stable@vger.kernel.org, clang-built-linux@googlegroups.com Subject: Re: [PATCH v4 mips-next 0/7] MIPS: vmlinux.lds.S sections fixes & cleanup Message-ID: <20210109111259.GA4213@alpha.franken.de> References: <20210107123331.354075-1-alobakin@pm.me> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210107123331.354075-1-alobakin@pm.me> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 07, 2021 at 12:33:38PM +0000, Alexander Lobakin wrote: > This series hunts the problems discovered after manual enabling of > ARCH_WANT_LD_ORPHAN_WARN. Notably: > - adds the missing PAGE_ALIGNED_DATA() section affecting VDSO > placement (marked for stable); > - properly stops .eh_frame section generation. > > Compile and runtime tested on MIPS32R2 CPS board with no issues > using two different toolkits: > - Binutils 2.35.1, GCC 10.2.0; > - LLVM stack 11.0.0. > > Since v3 [2]: > - fix the third patch as GNU stack emits .rel.dyn into VDSO for > some reason if .cfi_sections is specified. > > Since v2 [1]: > - stop discarding .eh_frame and just prevent it from generating > (Kees); > - drop redundant sections assertions (Fangrui); > - place GOT table in .text instead of asserting as it's not empty > when building with LLVM (Nathan); > - catch compound literals in generic definitions when building with > LD_DEAD_CODE_DATA_ELIMINATION (Kees); > - collect two Reviewed-bys (Kees). > > Since v1 [0]: > - catch .got entries too as LLD may produce it (Nathan); > - check for unwanted sections to be zero-sized instead of > discarding (Fangrui). > > [0] https://lore.kernel.org/linux-mips/20210104121729.46981-1-alobakin@pm.me > [1] https://lore.kernel.org/linux-mips/20210106200713.31840-1-alobakin@pm.me > [2] https://lore.kernel.org/linux-mips/20210107115120.281008-1-alobakin@pm.me > > Alexander Lobakin (7): > MIPS: vmlinux.lds.S: add missing PAGE_ALIGNED_DATA() section > MIPS: vmlinux.lds.S: add ".gnu.attributes" to DISCARDS > MIPS: properly stop .eh_frame generation > MIPS: vmlinux.lds.S: catch bad .rel.dyn at link time > MIPS: vmlinux.lds.S: explicitly declare .got table > vmlinux.lds.h: catch compound literals into data and BSS > MIPS: select ARCH_WANT_LD_ORPHAN_WARN this breaks my builds: LD vmlinux.o MODPOST vmlinux.symvers MODINFO modules.builtin.modinfo GEN modules.builtin LD .tmp_vmlinux.kallsyms1 mips64-linux-gnu-ld: Unexpected run-time relocations (.rel) detected! $ mips64-linux-gnu-ld --version GNU ld version 2.27-3.fc24 $ mips64-linux-gnu-gcc --version mips64-linux-gnu-gcc (GCC) 6.1.1 20160621 (Red Hat Cross 6.1.1-2) Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]