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 E6073C433EF for ; Mon, 13 Dec 2021 07:44:29 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5F19A6B0071; Mon, 13 Dec 2021 02:44:19 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 5A1C46B0073; Mon, 13 Dec 2021 02:44:19 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 491726B0074; Mon, 13 Dec 2021 02:44:19 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0126.hostedemail.com [216.40.44.126]) by kanga.kvack.org (Postfix) with ESMTP id 35C6A6B0071 for ; Mon, 13 Dec 2021 02:44:19 -0500 (EST) Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id E609785D7B for ; Mon, 13 Dec 2021 07:44:08 +0000 (UTC) X-FDA: 78911982618.21.1DF194C Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf24.hostedemail.com (Postfix) with ESMTP id 89844180009 for ; Mon, 13 Dec 2021 07:44:06 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 99CDA68AA6; Mon, 13 Dec 2021 08:44:04 +0100 (CET) Date: Mon, 13 Dec 2021 08:44:04 +0100 From: Christoph Hellwig To: Baoquan He Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, hch@lst.de, robin.murphy@arm.com, cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, vbabka@suse.cz, m.szyprowski@samsung.com, John.p.donnelly@oracle.com, kexec@lists.infradead.org Subject: Re: [PATCH RESEND v2 2/5] dma-pool: allow user to disable atomic pool Message-ID: <20211213074404.GA20758@lst.de> References: <20211207030750.30824-1-bhe@redhat.com> <20211207030750.30824-3-bhe@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211207030750.30824-3-bhe@redhat.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-Stat-Signature: ee11fktzpfgsecbqiooxyofzkiny6nex Authentication-Results: imf24.hostedemail.com; dkim=none; dmarc=none; spf=none (imf24.hostedemail.com: domain of hch@lst.de has no SPF policy when checking 213.95.11.211) smtp.mailfrom=hch@lst.de X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 89844180009 X-HE-Tag: 1639381446-877962 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 07, 2021 at 11:07:47AM +0800, Baoquan He wrote: > In the current code, three atomic memory pools are always created, > atomic_pool_kernel|dma|dma32, even though 'coherent_pool=0' is > specified in kernel command line. In fact, atomic pool is only > necessary when CONFIG_DMA_DIRECT_REMAP=y or mem_encrypt_active=y > which are needed on few ARCHes. And only these select the atomic pool, so it won't get created otherwise. What problem are you trying to solve?