On Wed, Apr 25, 2018 at 07:15:34AM +0200, Christoph Hellwig wrote:
> Define this symbol if the architecture either uses 64-bit pointers or the
> PHYS_ADDR_T_64BIT is set.  This covers 95% of the old arch magic.  We only
> need an additional select for Xen on ARM (why anyway?), and we now always
> set ARCH_DMA_ADDR_T_64BIT on mips boards with 64-bit physical addressing
> instead of only doing it when highmem is set.

I think this should be fine. It only affects alchemy and Netlogic, and
Netlogic supports highmem already.

So for MIPS:
Acked-by: James Hogan <jhogan@kernel.org>

Cheers
James

> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 985388078872..e10cc5c7be69 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -1101,9 +1101,6 @@ config GPIO_TXX9
>  config FW_CFE
>  	bool
>  
> -config ARCH_DMA_ADDR_T_64BIT
> -	def_bool (HIGHMEM && PHYS_ADDR_T_64BIT) || 64BIT
> -
>  config ARCH_SUPPORTS_UPROBES
>  	bool

> diff --git a/lib/Kconfig b/lib/Kconfig
> index ce9fa962d59b..1f12faf03819 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -435,6 +435,9 @@ config NEED_SG_DMA_LENGTH
>  config NEED_DMA_MAP_STATE
>  	bool
>  
> +config ARCH_DMA_ADDR_T_64BIT
> +	def_bool 64BIT || PHYS_ADDR_T_64BIT
> +
>  config IOMMU_HELPER
>  	bool