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=-22.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,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 72FB8C433ED for ; Tue, 18 May 2021 21:13:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 38D23611BD for ; Tue, 18 May 2021 21:13:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236987AbhERVOS (ORCPT ); Tue, 18 May 2021 17:14:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:42190 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230166AbhERVOR (ORCPT ); Tue, 18 May 2021 17:14:17 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id BDE79611BF; Tue, 18 May 2021 21:12:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621372378; bh=+XwfrEanFh4KN53uNfFPtVzdxotlHS4G0gMOF3X0WWU=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=jW7Z5QSAQBCRP3CKw+PHGutOzM5iOK9y1tHxZ6wz9E3G9YwJphlNGn4YXcrY5VVvU /8G7pnwdxTS8Be9nMmIT4mMf34ma2lXxCrYCifz10pMNCgGPrbq1D3MafdTe0cD180 thyhN50YhNCqhYek5zhBP7w5KqK9BRQO1b6/QgZFq14s/+WJxLlz1TEmrOYMw25STx lwQEf8oR297grjB9ipFruYyE0UgGB830qqXQR6kDeYYSpe/fXNMfZWPiSHYeeOqdeo AjjIYQxIbigYb/4UmQ1iZ1QJrJDC6hULdYEy7tg9dN72d4Km1cerHjsoJHVYejXtSB pFCddv1n/5rnw== Subject: Re: [PATCH] powerpc: Kconfig: disable CONFIG_COMPAT for clang < 12 To: Nick Desaulniers , Michael Ellerman Cc: Segher Boessenkool , Fangrui Song , Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com References: <20210518205858.2440344-1-ndesaulniers@google.com> From: Nathan Chancellor Message-ID: Date: Tue, 18 May 2021 14:12:56 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20210518205858.2440344-1-ndesaulniers@google.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/18/2021 1:58 PM, Nick Desaulniers wrote: > Until clang-12, clang would attempt to assemble 32b powerpc assembler in > 64b emulation mode when using a 64b target triple with -m32, leading to > errors during the build of the compat VDSO. Simply disable all of > CONFIG_COMPAT; users should upgrade to the latest release of clang for > proper support. > > Link: https://github.com/ClangBuiltLinux/linux/issues/1160 > Link: https://github.com/llvm/llvm-project/commits/2288319733cd5f525bf7e24dece08bfcf9d0ff9e > Link: https://groups.google.com/g/clang-built-linux/c/ayNmi3HoNdY/m/XJAGj_G2AgAJ > Suggested-by: Nathan Chancellor > Signed-off-by: Nick Desaulniers Reviewed-by: Nathan Chancellor > --- > arch/powerpc/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index ce3f59531b51..2a02784b7ef0 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -289,6 +289,7 @@ config PANIC_TIMEOUT > config COMPAT > bool "Enable support for 32bit binaries" > depends on PPC64 > + depends on !CC_IS_CLANG || CLANG_VERSION >= 120000 > default y if !CPU_LITTLE_ENDIAN > select ARCH_WANT_OLD_COMPAT_IPC > select COMPAT_OLD_SIGACTION >