From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752130AbdJCKqh (ORCPT ); Tue, 3 Oct 2017 06:46:37 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:46139 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751922AbdJCKn2 (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: refactor dma_cache_sync V2 Date: Tue, 3 Oct 2017 12:43:00 +0200 Message-Id: <20171003104311.10058-1-hch@lst.de> X-Mailer: git-send-email 2.14.1 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 The dma_cache_sync routines is used to flush caches for memory returned by dma_alloc_attrs with the DMA_ATTR_NON_CONSISTENT flag (or previously from dma_alloc_noncoherent), but the requirements for it seems to be frequently misunderstood. dma_cache_sync is documented to be a no-op for allocations that do not have the DMA_ATTR_NON_CONSISTENT flag set, and yet a lot of architectures implement it in some way despite not implementing DMA_ATTR_NON_CONSISTENT. This series removes a few abuses of dma_cache_sync for non-DMA API purposes, then changes all remaining architectures that do not implement DMA_ATTR_NON_CONSISTENT to implement dma_cache_sync as a no-op, and then adds the struct dma_map_ops indirection we use for all other DMA mapping operations to dma_cache_sync as well, thus removing all but two implementations of the function. Changes since V1: - drop the mips fd_cacheflush, merged via maintainer - spelling fix in last commit descriptions (thanks Geert)