linux-kernel - Re: [RFC][PATCH 1/3] staging: ion: Move away from the DMA APIs for cache flushing

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Date:	Thu, 26 May 2016 05:06:35 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Russell King - ARM Linux <linux@...linux.org.uk>
Cc:	Liviu Dudau <Liviu.Dudau@....com>,
	Laura Abbott <labbott@...hat.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	John Stultz <john.stultz@...aro.org>,
	Arve Hj?nnev?g <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linaro-mm-sig@...ts.linaro.org, devel@...verdev.osuosl.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Eun Taik Lee <eun.taik.lee@...sung.com>,
	Rohit kumar <rohit.kr@...sung.com>,
	Jon Medhurst <tixy@...aro.org>,
	Mitchel Humpherys <mitchelh@...eaurora.org>,
	Jeremy Gebben <jgebben@...eaurora.org>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [RFC][PATCH 1/3] staging: ion: Move away from the DMA APIs for
 cache flushing

On Thu, May 26, 2016 at 11:59:22AM +0100, Russell King - ARM Linux wrote:
> I _really_ hate seeing architecture internal functions being abused in
> drivers - architecture internal functions are there to implement the
> official kernel APIs and are not for drivers to poke about with.

Exactly - if drivers like drm and ion want to do something out side the
current DMA API we need to add a proper API, not hack around the lack of
one.