Re: [PATCH 09/33] dma-mapping: take dma_pfn_offset into account in dma_max_pfn

Robin Murphy
2018-01-10T11:07:55Z

On 10/01/18 08:00, Christoph Hellwig wrote:
> This makes sure the generic version can be used with architectures /
> devices that have a DMA offset in the direct mapping.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>

> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> include/linux/dma-mapping.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
> index 81ed9b2d84dc..d84951865be7 100644
> --- a/include/linux/dma-mapping.h
> +++ b/include/linux/dma-mapping.h
> @@ -692,7 +692,7 @@ static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
> #ifndef dma_max_pfn
> static inline unsigned long dma_max_pfn(struct device *dev)
> {
> - return *dev->dma_mask >> PAGE_SHIFT;
> + return (*dev->dma_mask >> PAGE_SHIFT) + dev->dma_pfn_offset;
> }
> #endif
>
>