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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9EB0C433EF for ; Wed, 15 Dec 2021 07:28:08 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 40D6C6B0073; Wed, 15 Dec 2021 02:27:58 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 3BD636B0074; Wed, 15 Dec 2021 02:27:58 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2D2E86B0075; Wed, 15 Dec 2021 02:27:58 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0094.hostedemail.com [216.40.44.94]) by kanga.kvack.org (Postfix) with ESMTP id 226326B0073 for ; Wed, 15 Dec 2021 02:27:58 -0500 (EST) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id E444789095 for ; Wed, 15 Dec 2021 07:27:47 +0000 (UTC) X-FDA: 78919198974.26.0D9B93F Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf12.hostedemail.com (Postfix) with ESMTP id 654DF4000F for ; Wed, 15 Dec 2021 07:27:41 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 16DD568AFE; Wed, 15 Dec 2021 08:27:45 +0100 (CET) Date: Wed, 15 Dec 2021 08:27:44 +0100 From: Christoph Hellwig To: john.p.donnelly@oracle.com Cc: Christoph Hellwig , Baoquan He , linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, cl@linux.com, kexec@lists.infradead.org, stable@vger.kernel.org, Pekka Enberg , David Rientjes , Joonsoo Kim , Vlastimil Babka Subject: Re: [PATCH v3 5/5] mm/slub: do not create dma-kmalloc if no managed pages in DMA zone Message-ID: <20211215072744.GB3010@lst.de> References: <20211213122712.23805-1-bhe@redhat.com> <20211213122712.23805-6-bhe@redhat.com> <20211214163124.GA21762@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-Rspamd-Queue-Id: 654DF4000F X-Stat-Signature: 7pxdxdcsx967pdw1xkibitzdo5ce7icg Authentication-Results: imf12.hostedemail.com; dkim=none; spf=none (imf12.hostedemail.com: domain of hch@lst.de has no SPF policy when checking 213.95.11.211) smtp.mailfrom=hch@lst.de; dmarc=none X-Rspamd-Server: rspam10 X-HE-Tag: 1639553261-731488 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 Tue, Dec 14, 2021 at 11:07:34AM -0600, john.p.donnelly@oracle.com wrote: > Is CONFIG_ZONE_DMA even needed anymore in x86_64 ? Yes. There are still plenty of addressing challenged devices, mostly ISA-like but also a few PCI/PCIe ones.