From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from newverein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 41M7Rz3c59zF2WT for ; Fri, 6 Jul 2018 05:37:51 +1000 (AEST) Date: Thu, 5 Jul 2018 21:38:46 +0200 From: Christoph Hellwig To: Robin Murphy Cc: hch@lst.de, m.szyprowski@samsung.com, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: Re: [RFC PATCH 2/2] dma-mapping: Clean up dma_get_required_mask() hooks Message-ID: <20180705193846.GC28905@lst.de> References: <55ac9550c311f056dcfeed9b2c8265375f17b155.1530726467.git.robin.murphy@arm.com> <08256121f325ceed7f6b88c1a5d3cf949698787d.1530726467.git.robin.murphy@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <08256121f325ceed7f6b88c1a5d3cf949698787d.1530726467.git.robin.murphy@arm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, Jul 04, 2018 at 06:50:12PM +0100, Robin Murphy wrote: > As for the other mask-related hooks, standardise the arch override into > a Kconfig option, and also pull the generic implementation into the DMA > mapping code rather than having it hide away in the platform bus code. Heh, I have a somewhat similar patch in my queue. I didn't want it out because dma_get_required_mask is rather ill defined at the moment and I wanted to clean that up first. But I guess I could apply this first and clean up later. I just fear you might be wanting to add an arm64 user, so I'd really like to understand why and how.