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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 655CDC433F5 for ; Mon, 13 Dec 2021 07:44:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232580AbhLMHoK (ORCPT ); Mon, 13 Dec 2021 02:44:10 -0500 Received: from verein.lst.de ([213.95.11.211]:46455 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230053AbhLMHoI (ORCPT ); Mon, 13 Dec 2021 02:44:08 -0500 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) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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?