linux-kernel - Re: [PATCH v4 2/3] common: DMA-mapping: add DMA_ATTR

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Message-ID: <20160109075402.GA25059@infradead.org>
Date:	Fri, 8 Jan 2016 23:54:02 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Russell King <linux@....linux.org.uk>,
	Robin Murphy <robin.murphy@....com>,
	Tomasz Figa <tfiga@...omium.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Pawel Osciak <pawel@...iak.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] common: DMA-mapping: add DMA_ATTR_NOHUGEPAGE
 attribute

On Fri, Jan 08, 2016 at 03:05:23PM -0800, Doug Anderson wrote:
> In my cover letter I tried to address this.  See
> <http://comments.gmane.org/gmane.linux.kernel/2121364>.  I said:
> 
> > Notably missing from this series is the fourth patch that adds teeth to
> > the second and third.  You can find that out of tree at
> > <https://chromium-review.googlesource.com/#/c/320498/>.  Unfortunately
> > the rk3288_vpu, which is what I'm working on, is out of tree.

Yes, I read that.  And that's exactly why I said we should not add
crazy workarounds for code that's not even in the kernel.

> ...but today I realized that I also needed to do work to get Exynos's
> MFC codec using this patch and MFC _is_ upstream.  ...so my next
> series will include the MFC patch.  Hopefully that will help address
> your concerns.

Ok.