Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756147AbcJGHdI (ORCPT ); Fri, 7 Oct 2016 03:33:08 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:51471 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751174AbcJGHdA (ORCPT ); Fri, 7 Oct 2016 03:33:00 -0400 Date: Fri, 7 Oct 2016 00:32:52 -0700 From: Christoph Hellwig To: Tushar Dave Cc: davem@davemloft.net, chris.hyser@oracle.com, sowmini.varadhan@oracle.com, vgupta@synopsys.com, robin.murphy@arm.com, jroedel@suse.de, egtvedt@samfundet.no, krzk@kernel.org, sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 6/6] sparc64: Enable 64-bit DMA Message-ID: <20161007073252.GA8290@infradead.org> References: <1475796816-14448-1-git-send-email-tushar.n.dave@oracle.com> <1475796816-14448-7-git-send-email-tushar.n.dave@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1475796816-14448-7-git-send-email-tushar.n.dave@oracle.com> User-Agent: Mutt/1.6.1 (2016-04-27) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 388 Lines: 8 On Thu, Oct 06, 2016 at 04:33:36PM -0700, Tushar Dave wrote: > ATU 64bit addressing allows PCIe devices with 64bit DMA capabilities > to use ATU for 64bit DMA. Any chance to always enable this? Last I checked sparc was the only architecture still using a 32-bit dma_addr_t, leading to some fun breakage in things like the software RDMA drivers that abuse it to store a kernel pointer..