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 ED972C433EF for ; Mon, 21 Feb 2022 08:51:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344875AbiBUIvc (ORCPT ); Mon, 21 Feb 2022 03:51:32 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:41500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344871AbiBUIva (ORCPT ); Mon, 21 Feb 2022 03:51:30 -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 ECB7E2BCB; Mon, 21 Feb 2022 00:51:07 -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 A3800B80E9E; Mon, 21 Feb 2022 08:51:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE643C340E9; Mon, 21 Feb 2022 08:51:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1645433465; bh=E9F/O+mQYHL8w3t40Odt55FrpN5ng82YJzsgM/QiLqs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mpJk2bxToXEhHaJK97UmcVLsf+ZNtX8WZSAkCAxvRXaBgpOAPeReMpxBkew1zFIXK LLFXx8mgrrsXtF8Dt8OiK0BUb1P7aOdXO46H5pQl8TN4K5435ALEb6yRL/N9Ba0gTk 0Cu30stFlTg7S4dv19LNljdKEHy4Hdei0A4Se6pA= 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 4.9 01/33] Makefile.extrawarn: Move -Wunaligned-access to W=1 Date: Mon, 21 Feb 2022 09:48:54 +0100 Message-Id: <20220221084908.615678129@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220221084908.568970525@linuxfoundation.org> References: <20220221084908.568970525@linuxfoundation.org> User-Agent: quilt/0.66 X-stable: review X-Patchwork-Hint: ignore 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 [nathan: Fix conflict due to lack of afe956c577b2d] Signed-off-by: Nathan Chancellor Signed-off-by: Greg Kroah-Hartman --- scripts/Makefile.extrawarn | 1 + 1 file changed, 1 insertion(+) --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -71,5 +71,6 @@ KBUILD_CFLAGS += $(call cc-disable-warni KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length) KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized) KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) +KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access) endif endif