linux-kernel - Re: CMA broken in next-20120926

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Message-ID: <20120928105255.GA29125@suse.de>
Date:	Fri, 28 Sep 2012 11:52:55 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Thierry Reding <thierry.reding@...onic-design.de>
Cc:	Peter Ujfalusi <peter.ujfalusi@...com>,
	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: Re: CMA broken in next-20120926

On Fri, Sep 28, 2012 at 12:38:15PM +0200, Thierry Reding wrote:
> >
> > 
> > I've been running a few tests and indeed this solves the obvious problem
> > that the coherent pool cannot be created at boot (which in turn caused
> > the ethernet adapter to fail on Tegra).
> > 
> > However I've been working on the Tegra DRM driver, which uses CMA to
> > allocate large chunks of framebuffer memory and these are now failing.
> > I'll need to check if Minchan's patch solves that problem as well.
> 
> Indeed, with Minchan's patch the DRM can allocate the framebuffer
> without a problem. Something else must be wrong then.
> 

Can you check if Minchan's version 100% succeeds and my version 100%
fails or is it a case that sometimes CMA works and sometimes fails with
both versions?

I'll examine the patch of course and see what flaw is there this time.

-- 
Mel Gorman
SUSE Labs
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