linux-kernel - provide more common DMA API functions V2

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Message-Id: <1439795216-32189-1-git-send-email-hch@lst.de>
Date:	Mon, 17 Aug 2015 09:06:51 +0200
From:	Christoph Hellwig <hch@....de>
To:	akpm@...ux-foundation.org
Cc:	arnd@...db.de, linux@....linux.org.uk, catalin.marinas@....com,
	will.deacon@....com, ysato@...rs.sourceforge.jp, monstr@...str.eu,
	jonas@...thpole.se, cmetcalf@...hip.com, gxt@...c.pku.edu.cn,
	x86@...nel.org, linux-alpha@...r.kernel.org,
	linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
	linux-mips@...ux-mips.org, linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: provide more common DMA API functions V2

Since 2009 we have a nice asm-generic header implementing lots of DMA API
functions for architectures using struct dma_map_ops, but unfortunately
it's still missing a lot of APIs that all architectures still have to
duplicate.

This series consolidates the remaining functions, although we still
need arch opt outs for two of them as a few architectures have very
non-standard implementations.

Changes since V1:
 - keep a modified comment about dma_alloc_noncoherent vs
   dma_cache_sync in the ARM asm/dma-mapping.h
 - keep the ARM dma_set_mask instances to deal with dmabounce

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