linux-kernel - Re: [PATCH 8/9] ARM: integrate CMA with DMA-mapping subsystem

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Date:	Tue, 16 Aug 2011 15:14:52 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org,
	"'Daniel Walker'" <dwalker@...eaurora.org>,
	"'Russell King'" <linux@....linux.org.uk>,
	"'Jonathan Corbet'" <corbet@....net>,
	"'Mel Gorman'" <mel@....ul.ie>,
	"'Chunsang Jeong'" <chunsang.jeong@...aro.org>,
	"'Michal Nazarewicz'" <mina86@...a86.com>,
	"'Jesse Barker'" <jesse.barker@...aro.org>,
	"'Kyungmin Park'" <kyungmin.park@...sung.com>,
	"'Ankita Garg'" <ankita@...ibm.com>,
	"'Shariq Hasnain'" <shariq.hasnain@...aro.org>,
	"'Andrew Morton'" <akpm@...ux-foundation.org>,
	"'KAMEZAWA Hiroyuki'" <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 8/9] ARM: integrate CMA with DMA-mapping subsystem

On Tuesday 16 August 2011, Marek Szyprowski wrote:
> On Friday, August 12, 2011 5:01 PM Arnd Bergmann wrote:

> > How about something like
> > 
> >       if (arch_is_coherent() || nommu())
> >               ret = alloc_simple_buffer();
> >       else if (arch_is_v4_v5())
> >               ret = alloc_remap();
> >       else if (gfp & GFP_ATOMIC)
> >               ret = alloc_from_pool();
> >       else
> >               ret = alloc_from_contiguous();
> > 
> > This also allows a natural conversion to dma_map_ops when we get there.
> 
> Ok. Is it ok to enable CMA permanently for ARMv6+? If CMA is left conditional
> the dma pool code will be much more complicated, because it will need to support
> both CMA and non-CMA cases.

I think that is ok, yes.

	Arnd
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