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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 D4488C433DB for ; Fri, 5 Feb 2021 09:27:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8FBDF64FBE for ; Fri, 5 Feb 2021 09:27:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230347AbhBEJ0z (ORCPT ); Fri, 5 Feb 2021 04:26:55 -0500 Received: from verein.lst.de ([213.95.11.211]:59550 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230315AbhBEJV7 (ORCPT ); Fri, 5 Feb 2021 04:21:59 -0500 Received: by verein.lst.de (Postfix, from userid 2407) id 7F7B668B05; Fri, 5 Feb 2021 10:21:13 +0100 (CET) Date: Fri, 5 Feb 2021 10:21:13 +0100 From: Christoph Hellwig To: Barry Song Cc: m.szyprowski@samsung.com, hch@lst.de, robin.murphy@arm.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linuxarm@openeuler.org Subject: Re: [PATCH v2] dma-mapping: benchmark: pretend DMA is transmitting Message-ID: <20210205092113.GA870@lst.de> References: <20210205020035.25340-1-song.bao.hua@hisilicon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210205020035.25340-1-song.bao.hua@hisilicon.com> User-Agent: Mutt/1.5.17 (2007-11-01) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Feb 05, 2021 at 03:00:35PM +1300, Barry Song wrote: > + __u32 dma_trans_ns; /* time for DMA transmission in ns */ > __u64 expansion[10]; /* For future use */ We need to keep the struct size, so the expansion field needs to shrink by the equivalent amount of data that is added in dma_trans_ns. 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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 0801BC433E0 for ; Fri, 5 Feb 2021 09:21:25 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0133064F3B for ; Fri, 5 Feb 2021 09:21:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0133064F3B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 4B3DC20384; Fri, 5 Feb 2021 09:21:23 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xQjl7LA6qIOw; Fri, 5 Feb 2021 09:21:22 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by silver.osuosl.org (Postfix) with ESMTP id F416B2E0FD; Fri, 5 Feb 2021 09:21:21 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id C2ABDC08A1; Fri, 5 Feb 2021 09:21:21 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id BA95CC013A for ; Fri, 5 Feb 2021 09:21:19 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 8D199871B6 for ; Fri, 5 Feb 2021 09:21:19 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u471kG9ZdQPI for ; Fri, 5 Feb 2021 09:21:18 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by hemlock.osuosl.org (Postfix) with ESMTPS id 43E518714E for ; Fri, 5 Feb 2021 09:21:18 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 7F7B668B05; Fri, 5 Feb 2021 10:21:13 +0100 (CET) Date: Fri, 5 Feb 2021 10:21:13 +0100 From: Christoph Hellwig To: Barry Song Subject: Re: [PATCH v2] dma-mapping: benchmark: pretend DMA is transmitting Message-ID: <20210205092113.GA870@lst.de> References: <20210205020035.25340-1-song.bao.hua@hisilicon.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210205020035.25340-1-song.bao.hua@hisilicon.com> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: linux-kernel@vger.kernel.org, linuxarm@openeuler.org, iommu@lists.linux-foundation.org, robin.murphy@arm.com, hch@lst.de X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Fri, Feb 05, 2021 at 03:00:35PM +1300, Barry Song wrote: > + __u32 dma_trans_ns; /* time for DMA transmission in ns */ > __u64 expansion[10]; /* For future use */ We need to keep the struct size, so the expansion field needs to shrink by the equivalent amount of data that is added in dma_trans_ns. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu