Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp5335260imu; Tue, 29 Jan 2019 17:38:43 -0800 (PST) X-Google-Smtp-Source: ALg8bN46m1JKqKZcxEN3RQmEK8QhWa54IhosQuuvcfKNfscxm1HsEyVnUnT6gTVZl4ws4dnRfQCk X-Received: by 2002:a17:902:1745:: with SMTP id i63mr27741274pli.145.1548812323711; Tue, 29 Jan 2019 17:38:43 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1548812323; cv=none; d=google.com; s=arc-20160816; b=1CceRfrcmNDHSgW7uF1jNMXUPKccwo0Edk17jp6IFXb4gLJcooUophzHyqpoZFSBl3 n4ZVP7G/ccG0+qe0OJzONwRF0QmBQjoynzynWYiElUone/rnk/BqtF64bR11bByYyM5X /4HN1sbQQGK+WorxPbEtf+YhiP3baaa0y2jKIt0Jw1UAbiQ6gQwWuZ967L0CdFwRCDNZ KYPx3mejtzhrZoSmvXTsuZf25J30XW2m1GQi/m+51RyXgy9C6sYFrWDL7TA7inacjn3I gtcJvUDlmiCO5FLcBIJsvaKba+FjHhfmiaZDjLoGbtS6nEI8htHO6YN09BFdTLX9doh5 q0ZQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=L61X656qSsECwwPGUjlUNFlfgOeYmB5dWt+lmom6EJg=; b=nd/9rQp8cbfzbB2tkFs0H//8G54hW8jq8n4mNozgbO08CXiCx/+N4jA1aUES6r9qgW SToNy8GBwfSwGpNWryEjm+hhgc2fcWMW1FqCtdZEuyLOiDCdZ7lbOjCiINy86Kw9a5hI JPCK3xjvnMIw2gdXE4IK6+iJVdnLKalLvcbsxhK7i6VumF/hQ5/78C9OBUFKA48Vlx/v xXwDCKgPlro69tqbAB5i3zws0YsetrlCspzEzrwn8Lr8XF1+TaRIwpxedQ8WTrvDCXns APPfxBKpwq6KGpjuBYFb65S0ZrgNjC/QexKkX3GvZ5dz7gjcTPeEnWz6B5Zps5OJqIkJ lGTg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id v20si96198pgk.103.2019.01.29.17.38.28; Tue, 29 Jan 2019 17:38:43 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728676AbfA3Bgh (ORCPT + 99 others); Tue, 29 Jan 2019 20:36:37 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:41062 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727640AbfA3Bgg (ORCPT ); Tue, 29 Jan 2019 20:36:36 -0500 Received: from akpm3.svl.corp.google.com (unknown [104.133.8.65]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 13EF13635; Wed, 30 Jan 2019 01:36:36 +0000 (UTC) Date: Tue, 29 Jan 2019 17:36:34 -0800 From: Andrew Morton To: Andrey Ryabinin Cc: Anders Roxell , arnd@arndb.de, linux-kernel@vger.kernel.org Subject: Re: [PATCH] lib/ubsan: default UBSAN_ALIGNMENT to not set Message-Id: <20190129173634.ee579795b227b141efc8bd30@linux-foundation.org> In-Reply-To: <8bc73bbf-6c12-7fd1-3253-676731bf5ae5@virtuozzo.com> References: <20181217150326.30933-1-anders.roxell@linaro.org> <8bc73bbf-6c12-7fd1-3253-676731bf5ae5@virtuozzo.com> X-Mailer: Sylpheed 3.6.0 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 11 Jan 2019 22:01:16 +0300 Andrey Ryabinin wrote: > > > On 12/17/18 6:03 PM, Anders Roxell wrote: > > When booting an allmodconfig kernel, there are a lot of false-positives. > > With a message like this 'UBSAN: Undefined behaviour in...' with a call > > trace that follows. > > > > Reworked so that when building a allmodconfig kernel that turns > > everything into '=m' or '=y' will turn off UBSAN_ALIGNMENT. > > > > Suggested-by: Arnd Bergmann > > Signed-off-by: Anders Roxell > > --- > > Acked-by: Andrey Ryabinin > Confused. Why does allmodconfig result in UBSAN warnings?