Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754099AbcJKRFV (ORCPT ); Tue, 11 Oct 2016 13:05:21 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:59083 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752183AbcJKRFU (ORCPT ); Tue, 11 Oct 2016 13:05:20 -0400 Date: Tue, 11 Oct 2016 09:38:06 -0700 From: Christoph Hellwig To: tndave Cc: Christoph Hellwig , 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: <20161011163806.GA21231@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> <20161007073252.GA8290@infradead.org> <4a70e648-a854-55d1-54ac-313b84841d04@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4a70e648-a854-55d1-54ac-313b84841d04@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: 395 Lines: 10 Hi Tushar, On Fri, Oct 07, 2016 at 01:09:15AM -0700, tndave wrote: > With change made by patch 6/6, dma_addr_t is always 64-bit, no matter if > device DMA mask is 32-bit (i.e. using existing IOMMU) or 64-bit (i.e > using ATU) But only iff CONFIG_ARCH_ATU is set. Anyway, I'll wait for your patches to got in first and will then propose getting rid of CONFIG_ARCH_DMA_ADDR_T_64BIT separately.