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=-2.2 required=3.0 tests=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 4BFF5C606C9 for ; Mon, 8 Jul 2019 18:52:20 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (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 298DA21707 for ; Mon, 8 Jul 2019 18:52:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 298DA21707 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 mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id C32D62A83; Mon, 8 Jul 2019 18:52:19 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id B9E442656 for ; Mon, 8 Jul 2019 18:43:54 +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 smtp1.linuxfoundation.org (Postfix) with ESMTPS id 50A24827 for ; Mon, 8 Jul 2019 18:43:54 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 8C7F2227A81; Mon, 8 Jul 2019 20:43:51 +0200 (CEST) Date: Mon, 8 Jul 2019 20:43:51 +0200 From: Christoph Hellwig To: Arend Van Spriel Subject: Re: use exact allocation for dma coherent memory Message-ID: <20190708184351.GA12877@lst.de> References: <20190614134726.3827-1-hch@lst.de> <20190701084833.GA22927@lst.de> <74eb9d99-6aa6-d1ad-e66d-6cc9c496b2f3@broadcom.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <74eb9d99-6aa6-d1ad-e66d-6cc9c496b2f3@broadcom.com> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: Maxime Ripard , Joonas Lahtinen , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Christoph Hellwig , devel@driverdev.osuosl.org, linux-s390@vger.kernel.org, linux-rdma@vger.kernel.org, David Airlie , linux-media@vger.kernel.org, Intel Linux Wireless , intel-gfx@lists.freedesktop.org, Maarten Lankhorst , Jani Nikula , Ian Abbott , Rodrigo Vivi , Sean Paul , "moderated list:ARM PORT" , netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, H Hartley Sweeten , iommu@lists.linux-foundation.org, Daniel Vetter X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 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 Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On Tue, Jul 02, 2019 at 11:48:44AM +0200, Arend Van Spriel wrote: > You made me look ;-) Actually not touching my drivers so I'm off the hook. > However, I was wondering if drivers could know so I decided to look into > the DMA-API.txt documentation which currently states: > > """ > The flag parameter (dma_alloc_coherent() only) allows the caller to > specify the ``GFP_`` flags (see kmalloc()) for the allocation (the > implementation may choose to ignore flags that affect the location of > the returned memory, like GFP_DMA). > """ > > I do expect you are going to change that description as well now that you > are going to issue a warning on __GFP_COMP. Maybe include that in patch > 15/16 where you introduce that warning. Yes, that description needs an updated, even without this series. I'll make sure it is more clear. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu