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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 825EAC4332F for ; Thu, 30 Sep 2021 16:50:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5F15261268 for ; Thu, 30 Sep 2021 16:50:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352370AbhI3QwB (ORCPT ); Thu, 30 Sep 2021 12:52:01 -0400 Received: from ale.deltatee.com ([204.191.154.188]:43978 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348841AbhI3Qv4 (ORCPT ); Thu, 30 Sep 2021 12:51:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:In-Reply-To:MIME-Version:Date: Message-ID:From:References:Cc:To:content-disposition; bh=74h/+uZ+hrx0m4JxI1QkVpn5MOeSFXzNtUhZ4V300TI=; b=B5EPYCR6ELWWooi0yJ6/qwUCfs xW68Odfkghb4ttQc08Np1dJRJhN9XdQKzIzlF9dxrShVzcR/fZ5mUTyUvDuCkeNQ4pQDaLqRNu4AV 9LBrq4VtrshpfRFd0tC3BAEpbaapoxt2T047s7v1k6PNW0G2koW4beGyNRcL+qQrpt1pAbvFArccc 9VhMSwHDeIwHWvh1BwQ3z3yRH/FBLA0ifIAFC12OqOFSrd1SnYHwgJBpvv5ay7kPYeRzcbtcELV2O OfNoBSYFaO6AmrjP+TI7VDSlCZHBP7pqp9YmEG2tAPspvl1N53iFQI2JW4LgrqkrZjwFCuG05yLoM xP02bFUA==; Received: from s0106a84e3fe8c3f3.cg.shawcable.net ([24.64.144.200] helo=[192.168.0.10]) by ale.deltatee.com with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1mVzFp-0004cR-WF; Thu, 30 Sep 2021 10:49:55 -0600 To: Chaitanya Kulkarni , "linux-kernel@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "linux-block@vger.kernel.org" , "linux-pci@vger.kernel.org" , "linux-mm@kvack.org" , "iommu@lists.linux-foundation.org" Cc: Stephen Bates , Christoph Hellwig , Dan Williams , Jason Gunthorpe , =?UTF-8?Q?Christian_K=c3=b6nig?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Jakowski Andrzej , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy , Martin Oliveira , Chaitanya Kulkarni References: <20210916234100.122368-1-logang@deltatee.com> <20210916234100.122368-2-logang@deltatee.com> From: Logan Gunthorpe Message-ID: Date: Thu, 30 Sep 2021 10:49:46 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-CA Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 24.64.144.200 X-SA-Exim-Rcpt-To: ckulkarnilinux@gmail.com, martin.oliveira@eideticom.com, robin.murphy@arm.com, ira.weiny@intel.com, helgaas@kernel.org, jianxin.xiong@intel.com, dave.hansen@linux.intel.com, jason@jlekstrand.net, dave.b.minturn@intel.com, andrzej.jakowski@intel.com, daniel.vetter@ffwll.ch, willy@infradead.org, ddutile@redhat.com, jhubbard@nvidia.com, christian.koenig@amd.com, jgg@ziepe.ca, dan.j.williams@intel.com, hch@lst.de, sbates@raithlin.com, iommu@lists.linux-foundation.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, chaitanyak@nvidia.com X-SA-Exim-Mail-From: logang@deltatee.com Subject: Re: [PATCH v3 01/20] lib/scatterlist: add flag for indicating P2PDMA segments in an SGL X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021-09-29 10:47 p.m., Chaitanya Kulkarni wrote: > Logan, > >> +/* >> + * bit 2 is the third free bit in the page_link on 64bit systems which >> + * is used by dma_unmap_sg() to determine if the dma_address is a PCI >> + * bus address when doing P2PDMA. >> + * Note: CONFIG_PCI_P2PDMA depends on CONFIG_64BIT because of this. >> + */ >> + >> +#ifdef CONFIG_PCI_P2PDMA >> +#define SG_DMA_PCI_P2PDMA 0x04UL >> +#else >> +#define SG_DMA_PCI_P2PDMA 0x00UL >> +#endif >> + >> +#define SG_PAGE_LINK_MASK (SG_CHAIN | SG_END | SG_DMA_PCI_P2PDMA) >> + > > You are doing two things in one patch :- > 1. Introducing a new macro to replace the current macros. > 2. Adding a new member to those macros. > > shouldn't this be split into two patches where you introduce a > macro SG_PAGE_LINK_MASK (SG_CHAIN | SG_END) in prep patch and > update the SF_PAGE_LINK_MASK with SG_DMA_PCI_P2PDMA with related > code? > Ok, will split. I'll also add the static inline cleanup Jason suggested in the first patch. Logan