Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp984327imu; Thu, 20 Dec 2018 08:18:11 -0800 (PST) X-Google-Smtp-Source: AFSGD/X5aIP5D/EXYK8uNRGAXOR4dYw3R4d+aBXgt4NIFBoAckna35aXNIxApPczbjzT9ydD60VO X-Received: by 2002:a17:902:5a0b:: with SMTP id q11mr24983043pli.186.1545322691867; Thu, 20 Dec 2018 08:18:11 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1545322691; cv=none; d=google.com; s=arc-20160816; b=efD2vHEVm+obRHQc/dMKwa2TekzSsllSCDTcdvUk0F7Ygk9DXGKCZxriClSYBjvq5C 3KNbpwOjrOPLjAYeOWFcQGSZGxBO3vx+mnj5pvup86RPD5EbiOtYZIgqeJd/784uV1Ke fyRZcq0VtcIhmH9N9M1cP7k9vYC7naQorLAgniZckQ6pmg1/Fn2JU971oUYXgB93D9pO kebYDHygsdJ3gjXACNdRAddS6W/82yLYTEi9H9aX1ficPcCo/nx5brAA9m36fQhX+fXb ilDbz5aZBiTnASjHQPajf6JMN3zv/opgVSBk7dXvEmJZoJIjyYOgXQ1IV2Kxgxj8NUkj sYIg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=h9Xfspl8Mzu9Fz5V7N+I5xQpRBO/8XsUI+3TR1UvSNM=; b=xvBuwFjRxsGmRrykp7vU87YiM/UXMGzYJjJPu4O+kZdhxizLdP5EY1070aAKR1yyMg Xk5Bh4vIWIUdcNt8m6zrp7kYhTOAhIYh7t7xDTqKwzci/RGz0Y6YPxIFP/TIYHoqYEJu xQLYtzlCZpS2/2LRlX+2aFnburAAppRUbkydRZMgAWeNfNzkoLUU2z1Rha7uYQkxRjYe FxF/7IDxddPvanw5LrPMeeMtFAoaABynVtFHls0CaBtmgYdUIsXNmXOPAVg9eja5/Y3t 19+erBE5jVwLPmM+YiToDSjDyiI96Nb+q2la0PggkQqfJppKCsIfgPvHrsHisG/yJxEG TW8g== 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 k5si18626097plt.111.2018.12.20.08.17.56; Thu, 20 Dec 2018 08:18:11 -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 S2387593AbeLTOeS (ORCPT + 99 others); Thu, 20 Dec 2018 09:34:18 -0500 Received: from verein.lst.de ([213.95.11.211]:53530 "EHLO newverein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732776AbeLTOeS (ORCPT ); Thu, 20 Dec 2018 09:34:18 -0500 Received: by newverein.lst.de (Postfix, from userid 2407) id C9C8C68AA6; Thu, 20 Dec 2018 15:34:15 +0100 (CET) Date: Thu, 20 Dec 2018 15:34:15 +0100 From: "hch@lst.de" To: Eugeniy Paltsev Cc: "hch@lst.de" , Vineet Gupta , "iommu@lists.linux-foundation.org" , "linux-kernel@vger.kernel.org" , "linux-s390@vger.kernel.org" , "linux-xtensa@linux-xtensa.org" , "linux-m68k@lists.linux-m68k.org" , "linux-alpha@vger.kernel.org" , "linux-snps-arc@lists.infradead.org" , "openrisc@lists.librecores.org" , "ashutosh.dixit@intel.com" , "linux-parisc@vger.kernel.org" , "linux-c6x-dev@linux-c6x.org" , "monstr@monstr.eu" , "sparclinux@vger.kernel.org" Subject: Re: ensure dma_alloc_coherent always returns zeroed memory Message-ID: <20181220143415.GA17726@lst.de> References: <20181214082515.14835-1-hch@lst.de> <20181219165939.GA26087@lst.de> <1545316369.14089.20.camel@synopsys.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1545316369.14089.20.camel@synopsys.com> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 20, 2018 at 02:32:52PM +0000, Eugeniy Paltsev wrote: > Hi Christoph, > > I test kernel from your 'dma-alloc-always-zero' branch, and as > I can see we have DMA peripherals (like USB) broken. I would be really surprised if that is caused by the patch to add the zeroing. Can you check which commit caused the issue by bisecting from a known good baseline?