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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 0A05EC3A589 for ; Thu, 15 Aug 2019 14:11:51 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 37188206C2 for ; Thu, 15 Aug 2019 14:11:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="PtMKB3MH" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 37188206C2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 468T0L5fc9zDr2J for ; Fri, 16 Aug 2019 00:11:46 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=linuxfoundation.org (client-ip=198.145.29.99; helo=mail.kernel.org; envelope-from=gregkh@linuxfoundation.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="PtMKB3MH"; dkim-atps=neutral Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 468Srx2l5YzDqJ2 for ; Fri, 16 Aug 2019 00:05:21 +1000 (AEST) Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 171BD20644; Thu, 15 Aug 2019 14:05:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565877918; bh=lOyzTACCHACUENr3Alx4Ml7IiaPxhwyXrxfcBKWNBJc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=PtMKB3MHNCBeXVQklF3aBuT4nPDLyDVWODXEgp48SJZXXqW5ovAbc9FVn+3tX8FKE pR1oRIblVReZKrtntkhiaZUu9/e7AjwFuaI4yblInt8eTNK1NW/ZB7XjP4YTtW5VlW eNlY1nowm+mCe1y3E25iAZAab2798Rbm62UuKYmw= Date: Thu, 15 Aug 2019 16:05:16 +0200 From: Greg Kroah-Hartman To: Christoph Hellwig Subject: Re: [PATCH 6/6] driver core: initialize a default DMA mask for platform device Message-ID: <20190815140516.GB7174@kroah.com> References: <20190811080520.21712-1-hch@lst.de> <20190811080520.21712-7-hch@lst.de> <20190815130325.GB17065@kroah.com> <20190815133812.GF12036@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190815133812.GF12036@lst.de> User-Agent: Mutt/1.12.1 (2019-06-15) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Gavin Li , Fabio Estevam , linux-arch@vger.kernel.org, Michal Simek , Maxime Chevallier , Alan Stern , NXP Linux Team , Mathias Nyman , Sascha Hauer , Minas Harutyunyan , Olav Kongas , Bin Liu , linux-arm-kernel@lists.infradead.org, Laurentiu Tudor , Geoff Levand , Shawn Guo , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Tony Prisk , iommu@lists.linux-foundation.org, Pengutronix Kernel Team , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, Aug 15, 2019 at 03:38:12PM +0200, Christoph Hellwig wrote: > On Thu, Aug 15, 2019 at 03:03:25PM +0200, Greg Kroah-Hartman wrote: > > > --- a/include/linux/platform_device.h > > > +++ b/include/linux/platform_device.h > > > @@ -24,6 +24,7 @@ struct platform_device { > > > int id; > > > bool id_auto; > > > struct device dev; > > > + u64 dma_mask; > > > > Why is the dma_mask in 'struct device' which is part of this structure, > > not sufficient here? Shouldn't the "platform" be setting that up > > correctly already in the "archdata" type callback? > > Becaus the dma_mask in struct device is a pointer that needs to point > to something, and this is the best space we can allocate for 'something'. > m68k and powerpc currently do something roughly equivalent at the moment, > while everyone else just has horrible, horrible hacks. As mentioned in > the changelog the intent of this patch is that we treat platform devices > like any other bus, where the bus allocates the space for the dma_mask. > The long term plan is to eventually kill that weird pointer indirection > that doesn't help anyone, but for that we need to sort out the basics > first. Ah, missed that, sorry. Ok, no objection from me. Might as well respin this series and I can queue it up after 5.3-rc5 is out (which will have your first 2 patches in it.) thanks, greg k-h