From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422796AbcFMMLO (ORCPT ); Mon, 13 Jun 2016 08:11:14 -0400 Received: from mail-wm0-f46.google.com ([74.125.82.46]:34262 "EHLO mail-wm0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161260AbcFMMLN (ORCPT ); Mon, 13 Jun 2016 08:11:13 -0400 Date: Mon, 13 Jun 2016 13:11:05 +0100 From: Sudip Mukherjee To: Mark Brown Cc: Andrew Morton , linux-kernel@vger.kernel.org, Simran Rai , Christoph Hellwig Subject: Re: [PATCH] dma: remove bad_dma_ops to fix build fail Message-ID: <20160613121105.GA12857@sudip-tp> References: <1465763104-6227-1-git-send-email-sudipm.mukherjee@gmail.com> <20160612213224.fcjalhwmjqwpjhui@rhwork> <20160613074112.GA2031@sudip-tp> <20160613092934.GE2282@sirena.org.uk> <20160613105108.GA5926@sudip-tp> <20160613115911.GG2282@sirena.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160613115911.GG2282@sirena.org.uk> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 13, 2016 at 12:59:11PM +0100, Mark Brown wrote: > On Mon, Jun 13, 2016 at 11:51:08AM +0100, Sudip Mukherjee wrote: > > On Mon, Jun 13, 2016 at 10:29:34AM +0100, Mark Brown wrote: > > > > Right, we've got a couple of obscure architectures with no DMA support > > > which are leading to a constant stream of patches like this that are > > > being triggered by compile coverage stuff. In situations like this we > > > very often provide stubs rather than having to handle this in lots of > > > different places in the code. > > > Ok, I will do that. But I am seeing arch/m32r/include/asm/m32102.h is > > defining the DMA Controller registers and also a MAX_DMA_ADDRESS is > > defined in dma.h. Doesn't that mean that this arch is capable of DMA? > > Quite possibly, but they don't seem to implement the standard interfaces > for generic code (this sort of thing is quite common for the less widely > used architectures sadly). If only I had a board to play with the DMA code. :( I will go for the stub like you said. Regards Sudip