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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 B8B0FC2B9FC for ; Mon, 10 May 2021 12:37:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9F73B61481 for ; Mon, 10 May 2021 12:37:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237305AbhEJMep (ORCPT ); Mon, 10 May 2021 08:34:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:54928 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233525AbhEJLMO (ORCPT ); Mon, 10 May 2021 07:12:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4B38E61139; Mon, 10 May 2021 11:09:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620644997; bh=nM82XFwB+Hv0Rbe30sfFpEmwyRJEFZjJt83JZ6zhF7s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=v9YSTGwGOaI0zWE7WIDJC3K4M2N4LjzeukiwhA7dT2yzgpbyUXH13azETGmXH0ubK MI9MkGMdyKIOtCqhDd5eCtcvvqjMh7wICKDrknFc5ZJjv7W3Upptvwdc4XalPu9ABq J7A+di50zfgg8rSTU6wvRJNHzcA4Dla1oNg7mmTk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Rosen Penev , Tony Ambardar , Michael Ellerman Subject: [PATCH 5.12 310/384] powerpc: fix EDEADLOCK redefinition error in uapi/asm/errno.h Date: Mon, 10 May 2021 12:21:39 +0200 Message-Id: <20210510102025.020262360@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510102014.849075526@linuxfoundation.org> References: <20210510102014.849075526@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tony Ambardar commit 7de21e679e6a789f3729e8402bc440b623a28eae upstream. A few archs like powerpc have different errno.h values for macros EDEADLOCK and EDEADLK. In code including both libc and linux versions of errno.h, this can result in multiple definitions of EDEADLOCK in the include chain. Definitions to the same value (e.g. seen with mips) do not raise warnings, but on powerpc there are redefinitions changing the value, which raise warnings and errors (if using "-Werror"). Guard against these redefinitions to avoid build errors like the following, first seen cross-compiling libbpf v5.8.9 for powerpc using GCC 8.4.0 with musl 1.1.24: In file included from ../../arch/powerpc/include/uapi/asm/errno.h:5, from ../../include/linux/err.h:8, from libbpf.c:29: ../../include/uapi/asm-generic/errno.h:40: error: "EDEADLOCK" redefined [-Werror] #define EDEADLOCK EDEADLK In file included from toolchain-powerpc_8540_gcc-8.4.0_musl/include/errno.h:10, from libbpf.c:26: toolchain-powerpc_8540_gcc-8.4.0_musl/include/bits/errno.h:58: note: this is the location of the previous definition #define EDEADLOCK 58 cc1: all warnings being treated as errors Cc: Stable Reported-by: Rosen Penev Signed-off-by: Tony Ambardar Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200917135437.1238787-1-Tony.Ambardar@gmail.com Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/include/uapi/asm/errno.h | 1 + 1 file changed, 1 insertion(+) --- a/arch/powerpc/include/uapi/asm/errno.h +++ b/arch/powerpc/include/uapi/asm/errno.h @@ -2,6 +2,7 @@ #ifndef _ASM_POWERPC_ERRNO_H #define _ASM_POWERPC_ERRNO_H +#undef EDEADLOCK #include #undef EDEADLOCK