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=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 82588C433E0 for ; Thu, 4 Mar 2021 14:17:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1E0A464F02 for ; Thu, 4 Mar 2021 14:17:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1E0A464F02 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 775416B0006; Thu, 4 Mar 2021 09:17:43 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 7257F6B0008; Thu, 4 Mar 2021 09:17:43 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5C69E6B000A; Thu, 4 Mar 2021 09:17:43 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0004.hostedemail.com [216.40.44.4]) by kanga.kvack.org (Postfix) with ESMTP id 3E3216B0006 for ; Thu, 4 Mar 2021 09:17:43 -0500 (EST) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id F052D18264868 for ; Thu, 4 Mar 2021 14:17:42 +0000 (UTC) X-FDA: 77882395164.10.0073ADE Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf22.hostedemail.com (Postfix) with ESMTP id EBB51C001C65 for ; Thu, 4 Mar 2021 14:17:37 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 38AC164EF6; Thu, 4 Mar 2021 14:17:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614867456; bh=5SFoOpkNOISja2bka7WY1xY3Xu6DHtOUpfvK1KKO0Ho=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=KmSdKQPpfL8NUZTjBgr8+DvFEaxjKTvLNf2mi07XjFMqkkhK2Wdm0PdGbpJ1Ml5uQ dnNvPSaNnj9YiUrkr3hPxBKjrOs8rA1yvnUUv3ONmKgy5v87x3AASqOgqtnN02pDa2 z1hwXqWqpgjmYJN7O8sM35kkT/bZypmcKNvWHPqk= Date: Thu, 4 Mar 2021 15:17:34 +0100 From: Greg KH To: Nicolas Saenz Julienne Cc: Jing Xiangfeng , catalin.marinas@arm.com, will@kernel.org, akpm@linux-foundation.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, rppt@kernel.org, lorenzo.pieralisi@arm.com, guohanjun@huawei.com, sudeep.holla@arm.com, rjw@rjwysocki.net, lenb@kernel.org, song.bao.hua@hisilicon.com, ardb@kernel.org, anshuman.khandual@arm.com, bhelgaas@google.com, guro@fb.com, robh+dt@kernel.org, stable@vger.kernel.org, linux-arm-kernel@lists.infradead.org, frowand.list@gmail.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, wangkefeng.wang@huawei.com Subject: Re: [PATCH stable v5.10 0/7] arm64: Default to 32-bit wide ZONE_DMA Message-ID: References: <20210303073319.2215839-1-jingxiangfeng@huawei.com> <9bc396116372de5b538d71d8f9ae9c3259f1002e.camel@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9bc396116372de5b538d71d8f9ae9c3259f1002e.camel@suse.de> X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: EBB51C001C65 X-Stat-Signature: 1cpuynnn7xneou3bkxwij73zres9o1qs Received-SPF: none (kernel.org>: No applicable sender policy available) receiver=imf22; identity=mailfrom; envelope-from=""; helo=mail.kernel.org; client-ip=198.145.29.99 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1614867457-131926 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Mar 04, 2021 at 03:05:32PM +0100, Nicolas Saenz Julienne wrote: > Hi Greg. > > On Thu, 2021-03-04 at 14:46 +0100, Greg KH wrote: > > On Wed, Mar 03, 2021 at 03:33:12PM +0800, Jing Xiangfeng wrote: > > > Using two distinct DMA zones turned out to be problematic. Here's an > > > attempt go back to a saner default. > > > > What problem does this solve? How does this fit into the stable kernel > > rules? > > We changed the way we setup memory zones in arm64 in order to cater for > Raspberry Pi 4's weird DMA constraints: ZONE_DMA spans the lower 1GB of memory > and ZONE_DMA32 the rest of the 32bit address space. Since you can't allocate > memory that crosses zone boundaries, this broke crashkernel allocations on big > machines. This series fixes all this by parsing the HW description and checking > for DMA constrained buses. When not found, the unnecessary zone creation is > skipped. What kernel/commit caused this "breakage"? thanks, greg k-h