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 X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6CC38C43387 for ; Thu, 20 Dec 2018 14:46:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 449A7217D8 for ; Thu, 20 Dec 2018 14:46:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387718AbeLTOqG (ORCPT ); Thu, 20 Dec 2018 09:46:06 -0500 Received: from verein.lst.de ([213.95.11.211]:53607 "EHLO newverein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387667AbeLTOqG (ORCPT ); Thu, 20 Dec 2018 09:46:06 -0500 Received: by newverein.lst.de (Postfix, from userid 2407) id 485C368AA6; Thu, 20 Dec 2018 15:46:04 +0100 (CET) Date: Thu, 20 Dec 2018 15:46:04 +0100 From: "hch@lst.de" To: Eugeniy Paltsev Cc: "hch@lst.de" , "linux-kernel@vger.kernel.org" , "linux-s390@vger.kernel.org" , "linux-xtensa@linux-xtensa.org" , "linux-m68k@lists.linux-m68k.org" , "vineet.gupta1@synopsys.com" , "linux-alpha@vger.kernel.org" , "linux-snps-arc@lists.infradead.org" , "iommu@lists.linux-foundation.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: <20181220144604.GA18034@lst.de> References: <20181214082515.14835-1-hch@lst.de> <20181219165939.GA26087@lst.de> <1545316369.14089.20.camel@synopsys.com> <20181220143415.GA17726@lst.de> <1545316759.14089.22.camel@synopsys.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1545316759.14089.22.camel@synopsys.com> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org On Thu, Dec 20, 2018 at 02:39:20PM +0000, Eugeniy Paltsev wrote: > > I would be really surprised if that is caused by the patch to add > > the zeroing. > Me too :) > > > Can you check which commit caused the issue by bisecting > > from a known good baseline? > > Yep. At least kernel build from v4.20-rc4 (which is base for your branch) > seems to work fine. Well, the branch has quite a few commits. Can you check the commit just before the zeroing to start, and if that is already broken (which I suspect) bisect the offending commit?