[ppc32] WARNING: CPU: 0 PID: 1 at ./include/linux/dma-mapping.h:516 dmam_alloc_coherent+0xd8/0x118

[Christoph Hellwig]

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 at 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.