Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755078Ab3ILRpO (ORCPT ); Thu, 12 Sep 2013 13:45:14 -0400 Received: from mail-wg0-f52.google.com ([74.125.82.52]:48064 "EHLO mail-wg0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753352Ab3ILRpN (ORCPT ); Thu, 12 Sep 2013 13:45:13 -0400 MIME-Version: 1.0 X-Originating-IP: [2620:0:1000:1b02:6e3b:e5ff:fe16:f1aa] In-Reply-To: <20130912173554.GQ12758@n2100.arm.linux.org.uk> References: <1378960710-15648-1-git-send-email-olof@lixom.net> <5231F45C.3020500@infradead.org> <20130912173554.GQ12758@n2100.arm.linux.org.uk> Date: Thu, 12 Sep 2013 10:45:11 -0700 Message-ID: Subject: Re: [PATCH] dma: use %pa to print dma_addr_t From: Olof Johansson To: Russell King - ARM Linux Cc: Randy Dunlap , Vinod Koul , Dan Williams , Shawn Guo , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1265 Lines: 28 On Thu, Sep 12, 2013 at 10:35 AM, Russell King - ARM Linux wrote: > On Thu, Sep 12, 2013 at 10:11:44AM -0700, Olof Johansson wrote: >> Any >32bit-addressable machine will likely want 64-bit dma_addr_t as >> well. The only architecture that doesn't seem to set >> ARCH_DMA_ADDR_T_64BIT based on PHYS_ADDR_T size is ARM, and I think >> that should just be changed there as well. The thread Joe linked to refers to a comment that is now deleted; sparc64 apparantly has 32-bit dma_addr_t at least, so there are platforms where the two differ permanently. Adding a new printk format is probably needed here after all. > Do we actually have any 64-bit DMA controllers out there? As far as > I'm aware, all our DMA controllers are all 32-bit address only. That > makes a 64-bit dma_addr_t rather silly. PCI/PCI-e is the large unknown here, I'm not actually sure if any of the current implementation of host controllers support it, but it would seem likely that server-class hardware does. -Olof -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/