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Date: Fri, 2 Feb 2018 19:07:32 +0100
From: Christoph Hellwig <hch@lst.de>
To: Mathieu Malaterre <malat@debian.org>
Cc: Christoph Hellwig <hch@lst.de>,
 linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [ppc32] WARNING: CPU: 0 PID: 1 at
 ./include/linux/dma-mapping.h:516 dmam_alloc_coherent+0xd8/0x118
Message-ID: <20180202180732.GA8463@lst.de>
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 <20180202174622.GA7996@lst.de>
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On Fri, Feb 02, 2018 at 07:06:14PM +0100, Mathieu Malaterre wrote:
> On Fri, Feb 2, 2018 at 6:46 PM, Christoph Hellwig <hch@lst.de> wrote:
> > On Fri, Feb 02, 2018 at 02:11:33PM +0100, Mathieu Malaterre wrote:
> >> Hi there,
> >>
> >> What is this warning all about (system is Mac Mini G4) ? Thanks
> >
> > What kernel version is this?
> 
> I've synced with git/master this morning

Ok, that means it is the warning for the lack of a coherent dma mask.

Seems like the macio bus isn't setting a proper coherent mask.