Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752132AbdFHOCK (ORCPT ); Thu, 8 Jun 2017 10:02:10 -0400 Received: from foss.arm.com ([217.140.101.70]:49282 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751679AbdFHOCF (ORCPT ); Thu, 8 Jun 2017 10:02:05 -0400 Subject: Re: [PATCH 16/44] arm64: remove DMA_ERROR_CODE To: Christoph Hellwig , x86@kernel.org, linux-arm-kernel@lists.infradead.org, xen-devel@lists.xenproject.org, linux-c6x-dev@linux-c6x.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-mips@linux-mips.org, openrisc@lists.librecores.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, dmaengine@vger.kernel.org, linux-tegra@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org, iommu@lists.linux-foundation.org, netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org References: <20170608132609.32662-1-hch@lst.de> <20170608132609.32662-17-hch@lst.de> From: Robin Murphy Message-ID: Date: Thu, 8 Jun 2017 15:02:00 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 MIME-Version: 1.0 In-Reply-To: <20170608132609.32662-17-hch@lst.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1708 Lines: 49 On 08/06/17 14:25, Christoph Hellwig wrote: > The dma alloc interface returns an error by return NULL, and the > mapping interfaces rely on the mapping_error method, which the dummy > ops already implement correctly. > > Thus remove the DMA_ERROR_CODE define. Reviewed-by: Robin Murphy > Signed-off-by: Christoph Hellwig > --- > arch/arm64/include/asm/dma-mapping.h | 1 - > arch/arm64/mm/dma-mapping.c | 3 +-- > 2 files changed, 1 insertion(+), 3 deletions(-) > > diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h > index 5392dbeffa45..cf8fc8f05580 100644 > --- a/arch/arm64/include/asm/dma-mapping.h > +++ b/arch/arm64/include/asm/dma-mapping.h > @@ -24,7 +24,6 @@ > #include > #include > > -#define DMA_ERROR_CODE (~(dma_addr_t)0) > extern const struct dma_map_ops dummy_dma_ops; > > static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) > diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c > index 3216e098c058..147fbb907a2f 100644 > --- a/arch/arm64/mm/dma-mapping.c > +++ b/arch/arm64/mm/dma-mapping.c > @@ -184,7 +184,6 @@ static void *__dma_alloc(struct device *dev, size_t size, > no_map: > __dma_free_coherent(dev, size, ptr, *dma_handle, attrs); > no_mem: > - *dma_handle = DMA_ERROR_CODE; > return NULL; > } > > @@ -487,7 +486,7 @@ static dma_addr_t __dummy_map_page(struct device *dev, struct page *page, > enum dma_data_direction dir, > unsigned long attrs) > { > - return DMA_ERROR_CODE; > + return 0; > } > > static void __dummy_unmap_page(struct device *dev, dma_addr_t dev_addr, >