From patchwork Mon Mar 14 19:48:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 12780702 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 586A3C433FE for ; Mon, 14 Mar 2022 19:51:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244723AbiCNTwY (ORCPT ); Mon, 14 Mar 2022 15:52:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244683AbiCNTwT (ORCPT ); Mon, 14 Mar 2022 15:52:19 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B391D3F301; Mon, 14 Mar 2022 12:50:50 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id E8C92B80F79; Mon, 14 Mar 2022 19:50:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0768CC340E9; Mon, 14 Mar 2022 19:50:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1647287417; bh=kMPXQdSDTqPZw7TxTqFO8+ozgcvhKk61vNuNGq6NqZ4=; h=From:To:Cc:Subject:Date:From; b=aBYW5qr3K6D3J3laM6P3okKIixNitcz6eBEnEBls1QbCSU3MFvseZZdwZWbWqzmPZ T1xfXLDSYrcnDo3BO1UPC9Apfgj6XXgSHSdI+/fEImHikC2tXcSd6mK2gPVFvHZjSE ejnPBgt4ksCpDHJuo2kfZTRRuUltdiLxmObD5soPqUtzC5wglgwm9SqpwzlwWtB80K UKokgPWfw8A0jf/rK0SQMW9LTSQ7Qr34QOqFuPbN4MFfRAcMAARgCgSUuctH384LSm z/FTZFxvo1dXxy9MW9Q+Kn1E/rBwfk9A5DQ8XDyPQVJJyyAa6voZsrCOY4AIxI7eE4 p/ZVemtnuIHvg== From: Nathan Chancellor To: Peter Zijlstra , x86@kernel.org Cc: Andy Lutomirski , "H. Peter Anvin" , Nick Desaulniers , Masahiro Yamada , linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, llvm@lists.linux.dev, Nathan Chancellor Subject: [PATCH 0/2] x86: Avoid CONFIG_X86_X32_ABI=y with llvm-objcopy Date: Mon, 14 Mar 2022 12:48:40 -0700 Message-Id: <20220314194842.3452-1-nathan@kernel.org> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This series disables CONFIG_X86_X32_ABI=y with llvm-objcopy, which has had two outstanding issues, which are further outlined in the second patch: https://github.com/ClangBuiltLinux/linux/issues/514 https://github.com/ClangBuiltLinux/linux/issues/1141 The first patch is from Masahiro, which moves the CONFIG_X86_X32_ABI back into Kconfig proper. It was initially pushed as an RFC: https://lore.kernel.org/r/20210227183910.221873-1-masahiroy@kernel.org/ The conclusion of that thread was that the check was still needed because of the two issues above. However, with the introduction of IBT, specifically commit 41c5ef31ad71 ("x86/ibt: Base IBT bits"), the second issue linked above becomes visible with allmodconfig, which heavily impacts automated testing. The second patch builds on the first by just universally disabling CONFIG_X86_X32_ABI when using llvm-objcopy at configuration time so that neither issue is visible. While it is unlikely that these issues will be fixed in LLVM, this could eventually become a version check. This is based on -tip x86/core and I would like for both patches to go with the IBT changes so that there is no build breakage. Masahiro Yamada (1): x86: Remove toolchain check for X32 ABI capability Nathan Chancellor (1): x86/Kconfig: Do not allow CONFIG_X86_X32_ABI=y with llvm-objcopy arch/x86/Kconfig | 13 +++++++------ arch/x86/Makefile | 16 ---------------- arch/x86/entry/syscalls/Makefile | 2 +- arch/x86/include/asm/syscall_wrapper.h | 6 +++--- arch/x86/include/asm/vdso.h | 2 +- arch/x86/kernel/process_64.c | 2 +- fs/fuse/ioctl.c | 2 +- fs/xfs/xfs_ioctl32.c | 2 +- sound/core/control_compat.c | 16 ++++++++-------- sound/core/pcm_compat.c | 20 ++++++++++---------- 10 files changed, 33 insertions(+), 48 deletions(-) base-commit: f8afc9d88e65d189653f363eacc1f3131216ef7c