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 51ABD1ACEDA; Mon, 23 Jun 2025 21:24:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750713852; cv=none; b=kMycTT6WRcE9RVFNqthmAGAfeFbBEDjTknPKQ5DGR/Vf1P7dCRjxTl0U6BmUrOl3LljA9wKyruChb+wmxlpuvxge5c9HxX0m6mIou6Y4q69z5Z9+zdLhvxjBQAZhACtB41r7Cd5xOFs4oOU9gwkRf0WcAwuEME7uRnti3xGqq08= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750713852; c=relaxed/simple; bh=RFtkHTkCsC31eysJ0Jbq4wZDS7rcUMj12+OuOXs0UFg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OXHonOw6Yp/H3cBpjVsLAdd6MXfTjK1N0b5nrLc8+75AFbP84Fet5i/FZ2+5Kuylp1qu78IZeDnA3SDmi/MmZqFvtm26WAOtgtPi9LzNnkv1dj0MoTmt6hD8uVOorRgWfF022s87aT83NNZH7sMxaNk9Rt+wRA0A8jR042oESKE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=yKoXuibC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="yKoXuibC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE34FC4CEEA; Mon, 23 Jun 2025 21:24:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750713852; bh=RFtkHTkCsC31eysJ0Jbq4wZDS7rcUMj12+OuOXs0UFg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yKoXuibCRhiylrcLntctVBC30XfiQR2FGfx5apNykL1vQGUyGYWotm+XfMYQNcR0F IDBkhM3GND9ZNclINDWqsUv2Uwu9Rt1/zZXYgZgfoWxN0h33yVk0ptvKuVDGOhL3jw dMz+n1VJPcJ9T0+vR6N4exgMulokHHvYKclrGtIU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Masahiro Yamada , Nick Desaulniers , Nathan Chancellor , Linux Kernel Functional Testing , Anders Roxell Subject: [PATCH 5.15 171/411] kbuild: Update assembler calls to use proper flags and language target Date: Mon, 23 Jun 2025 15:05:15 +0200 Message-ID: <20250623130637.996853582@linuxfoundation.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250623130632.993849527@linuxfoundation.org> References: <20250623130632.993849527@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nick Desaulniers commit d5c8d6e0fa61401a729e9eb6a9c7077b2d3aebb0 upstream. as-instr uses KBUILD_AFLAGS, but as-option uses KBUILD_CFLAGS. This can cause as-option to fail unexpectedly when CONFIG_WERROR is set, because clang will emit -Werror,-Wunused-command-line-argument for various -m and -f flags in KBUILD_CFLAGS for assembler sources. Callers of as-option and as-instr should be adding flags to KBUILD_AFLAGS / aflags-y, not KBUILD_CFLAGS / cflags-y. Use KBUILD_AFLAGS in all macros to clear up the initial problem. Unfortunately, -Wunused-command-line-argument can still be triggered with clang by the presence of warning flags or macro definitions because '-x assembler' is used, instead of '-x assembler-with-cpp', which will consume these flags. Switch to '-x assembler-with-cpp' in places where '-x assembler' is used, as the compiler is always used as the driver for out of line assembler sources in the kernel. Finally, add -Werror to these macros so that they behave consistently whether or not CONFIG_WERROR is set. [nathan: Reworded and expanded on problems in commit message Use '-x assembler-with-cpp' in a couple more places] Link: https://github.com/ClangBuiltLinux/linux/issues/1699 Suggested-by: Masahiro Yamada Signed-off-by: Nick Desaulniers Signed-off-by: Nathan Chancellor Tested-by: Linux Kernel Functional Testing Tested-by: Anders Roxell Signed-off-by: Masahiro Yamada Signed-off-by: Nathan Chancellor Signed-off-by: Greg Kroah-Hartman --- scripts/Kconfig.include | 2 +- scripts/Makefile.compiler | 8 ++++---- scripts/as-version.sh | 2 +- 3 files changed, 6 insertions(+), 6 deletions(-) --- a/scripts/Kconfig.include +++ b/scripts/Kconfig.include @@ -33,7 +33,7 @@ ld-option = $(success,$(LD) -v $(1)) # $(as-instr,) # Return y if the assembler supports , n otherwise -as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -) +as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler-with-cpp -o /dev/null -) # check if $(CC) and $(LD) exist $(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found) --- a/scripts/Makefile.compiler +++ b/scripts/Makefile.compiler @@ -29,16 +29,16 @@ try-run = $(shell set -e; \ fi) # as-option -# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) +# Usage: aflags-y += $(call as-option,-Wa$(comma)-isa=foo,) as-option = $(call try-run,\ - $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) + $(CC) -Werror $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2)) # as-instr -# Usage: cflags-y += $(call as-instr,instr,option1,option2) +# Usage: aflags-y += $(call as-instr,instr,option1,option2) as-instr = $(call try-run,\ - printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) + printf "%b\n" "$(1)" | $(CC) -Werror $(KBUILD_AFLAGS) -c -x assembler-with-cpp -o "$$TMP" -,$(2),$(3)) # __cc-option # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) --- a/scripts/as-version.sh +++ b/scripts/as-version.sh @@ -45,7 +45,7 @@ orig_args="$@" # Get the first line of the --version output. IFS=' ' -set -- $(LC_ALL=C "$@" -Wa,--version -c -x assembler /dev/null -o /dev/null 2>/dev/null) +set -- $(LC_ALL=C "$@" -Wa,--version -c -x assembler-with-cpp /dev/null -o /dev/null 2>/dev/null) # Split the line on spaces. IFS=' '