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SubjectRe: [PATCH] powerpc: enable a 30-bit ZONE_DMA for 32-bit pmac
On 6/13/19 3:24 AM, Christoph Hellwig wrote:
> With the strict dma mask checking introduced with the switch to
> the generic DMA direct code common wifi chips on 32-bit powerbooks
> stopped working. Add a 30-bit ZONE_DMA to the 32-bit pmac builds
> to allow them to reliably allocate dma coherent memory.
> Fixes: 65a21b71f948 ("powerpc/dma: remove dma_nommu_dma_supported")
> Reported-by: Aaro Koskinen <>
> Signed-off-by: Christoph Hellwig <>

As expected, it works. The patch needs
Cc: Stable <stable*> # v5.1+

Tested-by: Larry Finger <>
Acked-by: Larry Finger <>

Thanks for the help, and the patience with my debugging problems with u64 variables.


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