linux-kernel - Re: [PATCH 2/5] dma-mapping: consolidate dma_{alloc,free}

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Message-ID: <20150813175541.GA21103@lst.de>
Date:	Thu, 13 Aug 2015 19:55:41 +0200
From:	Christoph Hellwig <hch@....de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Christoph Hellwig <hch@....de>, akpm@...ux-foundation.org,
	arnd@...db.de, 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: Re: [PATCH 2/5] dma-mapping: consolidate
	dma_{alloc,free}_noncoherent

On Thu, Aug 13, 2015 at 04:20:40PM +0100, Russell King - ARM Linux wrote:
> > -/*
> > - * Dummy noncoherent implementation.  We don't provide a dma_cache_sync
> > - * function so drivers using this API are highlighted with build warnings.
> > - */
> 
> I'd like a similar comment to remain after this patch explaining that we
> don't support non-coherent allocations and that it'll be highlighted by
> the lack of dma_cache_sync, otherwise I'm sure we'll start to get patches
> to add the thing.

I'll keep a modified version of this comment in the ARM dma-mapping.h
in addition to an explanation near the new common dma_alloc_noncoherent
definition, thanks!

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