From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752090AbdJCKqf (ORCPT ); Tue, 3 Oct 2017 06:46:35 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:36904 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751926AbdJCKn2 (ORCPT ); Tue, 3 Oct 2017 06:43:28 -0400 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: Marek Szyprowski , Robin Murphy , Michal Simek , David Howells , Guan Xuetao , Chris Zankel , Max Filippov , x86@kernel.org, linux-mips@linux-mips.org, linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-xtensa@linux-xtensa.org, linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 02/11] x86: make dma_cache_sync a no-op Date: Tue, 3 Oct 2017 12:43:02 +0200 Message-Id: <20171003104311.10058-3-hch@lst.de> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20171003104311.10058-1-hch@lst.de> References: <20171003104311.10058-1-hch@lst.de> 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 x86 does not implement DMA_ATTR_NON_CONSISTENT allocations, so it doesn't make any sense to do any work in dma_cache_sync given that it must be a no-op when dma_alloc_attrs returns coherent memory. Signed-off-by: Christoph Hellwig Reviewed-by: Thomas Gleixner --- arch/x86/include/asm/dma-mapping.h | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h index 1387dafdba2d..c6d3367be916 100644 --- a/arch/x86/include/asm/dma-mapping.h +++ b/arch/x86/include/asm/dma-mapping.h @@ -71,7 +71,6 @@ static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction dir) { - flush_write_buffers(); } static inline unsigned long dma_alloc_coherent_mask(struct device *dev, -- 2.14.1