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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3BE1C433F5 for ; Mon, 14 Feb 2022 10:40:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347762AbiBNKk2 (ORCPT ); Mon, 14 Feb 2022 05:40:28 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:48580 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350269AbiBNKhB (ORCPT ); Mon, 14 Feb 2022 05:37:01 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 73237A66FC; Mon, 14 Feb 2022 02:03:35 -0800 (PST) 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 5129CB80DA6; Mon, 14 Feb 2022 10:03:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 78861C340E9; Mon, 14 Feb 2022 10:03:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1644833012; bh=3AAAJwkkpJAVdQ8g3D/3TqrN1ZQgpjd4xMjw1mc5W6Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PvytXhlDQDhJxNnxhoFJFhTI/2xvnlJ57CQbCMNpIIZYz83dZNT1TREn0dpmX3g1b sZQG/nKVK+f/ZOPAG9B71K5dbIowywloNhNVCogDwNvvI2/UBJYar9E804eYlOxog7 DKfBfPWvRh+bub44F5cMXYnU8DPJmQqJlzR36K74= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nathan Chancellor , Nick Desaulniers , Masahiro Yamada Subject: [PATCH 5.16 195/203] Makefile.extrawarn: Move -Wunaligned-access to W=1 Date: Mon, 14 Feb 2022 10:27:19 +0100 Message-Id: <20220214092517.013301061@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220214092510.221474733@linuxfoundation.org> References: <20220214092510.221474733@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: Nathan Chancellor commit 1cf5f151d25fcca94689efd91afa0253621fb33a upstream. -Wunaligned-access is a new warning in clang that is default enabled for arm and arm64 under certain circumstances within the clang frontend (see LLVM commit below). On v5.17-rc2, an ARCH=arm allmodconfig build shows 1284 total/70 unique instances of this warning (most of the instances are in header files), which is quite noisy. To keep a normal build green through CONFIG_WERROR, only show this warning with W=1, which will allow automated build systems to catch new instances of the warning so that the total number can be driven down to zero eventually since catching unaligned accesses at compile time would be generally useful. Cc: stable@vger.kernel.org Link: https://github.com/llvm/llvm-project/commit/35737df4dcd28534bd3090157c224c19b501278a Link: https://github.com/ClangBuiltLinux/linux/issues/1569 Link: https://github.com/ClangBuiltLinux/linux/issues/1576 Signed-off-by: Nathan Chancellor Reviewed-by: Nick Desaulniers Signed-off-by: Masahiro Yamada Signed-off-by: Greg Kroah-Hartman --- scripts/Makefile.extrawarn | 1 + 1 file changed, 1 insertion(+) --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -51,6 +51,7 @@ KBUILD_CFLAGS += -Wno-sign-compare KBUILD_CFLAGS += -Wno-format-zero-length KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare +KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access) endif endif