From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CBBFD38DF8; Tue, 9 Jan 2024 17:58:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pBXR0hDI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EFD56C433F1; Tue, 9 Jan 2024 17:58:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1704823097; bh=jPQukDAtVbClY9EBeS+NqfHyLacDsIvaawr24NohtKA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=pBXR0hDIxuyEvjXNm0ZHkn82qvWJPxEeg8vRLhUWpcgwAjyw9QDysog3LK2PVQult 9Go+Fi125jYvZDB64hW3vCXxDEcn1/BK+pt5NqtqqQKLTdqo9bY948RcuvcxU2solW 4vKCSzlftGX3C8MVRS35uscVo5/xKVpYDqx9lrU9Apjy76V+ddXDE8gB+2mmN0AuZf oPcWHesQh5ieuYvzxayCuvHpRXx3KbE78X0kmN1z43HIDK8fHuuSm5D93GP6NTB/A2 otf9gtIxEuJz5XBV4wxvbQ8xXHf1BOfBSoPrqMAdPLvPhwTHpw3vbnYVN41E5sHJLi jqPfsfuLkmYcA== Date: Tue, 9 Jan 2024 10:58:14 -0700 From: Nathan Chancellor To: kernel test robot Cc: Thomas Zimmermann , ardb@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, bhelgaas@google.com, arnd@arndb.de, zohar@linux.ibm.com, dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, javierm@redhat.com, llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Subject: Re: [PATCH v4 2/4] arch/x86: Move internal setup_data structures into setup_data.h Message-ID: <20240109175814.GA5981@dev-arch.thelio-3990X> References: <20240108095903.8427-3-tzimmermann@suse.de> <202401090800.UOBEKB3W-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202401090800.UOBEKB3W-lkp@intel.com> On Tue, Jan 09, 2024 at 08:28:59AM +0800, kernel test robot wrote: > Hi Thomas, > > kernel test robot noticed the following build warnings: > > [auto build test WARNING on tip/x86/core] > [also build test WARNING on efi/next tip/master tip/auto-latest linus/master v6.7 next-20240108] > [If your patch is applied to the wrong git tree, kindly drop us a note. > And when submitting patch, we suggest to use '--base' as documented in > https://git-scm.com/docs/git-format-patch#_base_tree_information] > > url: https://github.com/intel-lab-lkp/linux/commits/Thomas-Zimmermann/arch-x86-Move-UAPI-setup-structures-into-setup_data-h/20240108-180158 > base: tip/x86/core > patch link: https://lore.kernel.org/r/20240108095903.8427-3-tzimmermann%40suse.de > patch subject: [PATCH v4 2/4] arch/x86: Move internal setup_data structures into setup_data.h > config: x86_64-rhel-8.3-bpf (https://download.01.org/0day-ci/archive/20240109/202401090800.UOBEKB3W-lkp@intel.com/config) > compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240109/202401090800.UOBEKB3W-lkp@intel.com/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot > | Closes: https://lore.kernel.org/oe-kbuild-all/202401090800.UOBEKB3W-lkp@intel.com/ > > All warnings (new ones prefixed by >>): > > In file included from arch/x86/realmode/rm/wakemain.c:3: > In file included from arch/x86/boot/boot.h:24: > In file included from arch/x86/include/asm/setup.h:10: > In file included from arch/x86/include/asm/page_types.h:7: > In file included from include/linux/mem_encrypt.h:17: > In file included from arch/x86/include/asm/mem_encrypt.h:18: > In file included from arch/x86/include/uapi/asm/bootparam.h:5: > >> arch/x86/include/asm/setup_data.h:10:20: warning: field 'data' with variable sized type 'struct setup_data' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] > 10 | struct setup_data data; > | ^ > 1 warning generated. I think this warning is expected. This structure is now included in the realmode part of arch/x86, which has its own set of build flags, including -Wall, which includes -Wgnu on clang. The kernel obviously uses GNU extensions and states this clearly with '-std=gnu11', so -Wno-gnu is unconditionally added to KBUILD_CFLAGS for clang. It seems that same treatment is needed for REALMODE_CFLAGS, which also matches arch/x86/boot/compressed/Makefile, see commit 6c3b56b19730 ("x86/boot: Disable Clang warnings about GNU extensions"): diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 1a068de12a56..24076db59783 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -53,6 +53,9 @@ REALMODE_CFLAGS += -fno-stack-protector REALMODE_CFLAGS += -Wno-address-of-packed-member REALMODE_CFLAGS += $(cc_stack_align4) REALMODE_CFLAGS += $(CLANG_FLAGS) +ifdef CONFIG_CC_IS_CLANG +REALMODE_CFLAGS += -Wno-gnu +endif export REALMODE_CFLAGS # BITS is used as extension for files which are available in a 32 bit