[PATCH 07/10] arm64: increase PHYS_MASK to 52 bits

[Suzuki K Poulose]

On 13/12/17 17:07, Kristina Martsenko wrote:
> PHYS_MASK_SHIFT represents the highest possible physical address
> supported by the kernel, and is used in a number of places. In order to
> support 52-bit physical memory, increase PHYS_MASK_SHIFT to 52 when
> 52-bit physical memory is configured, and retain 48 if it is not, to
> e.g. keep IDMAP_PGTABLE_LEVELS accurate. (The kconfig option to set
> ARM64_PA_BITS to 52 will be added in a later patch.)
> 
> Signed-off-by: Kristina Martsenko <kristina.martsenko at arm.com>
> ---
>   arch/arm64/include/asm/pgtable-hwdef.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
> index 60e0432df559..03fe82057bd1 100644
> --- a/arch/arm64/include/asm/pgtable-hwdef.h
> +++ b/arch/arm64/include/asm/pgtable-hwdef.h
> @@ -206,7 +206,7 @@
>   /*
>    * Highest possible physical address supported.
>    */
> -#define PHYS_MASK_SHIFT		(48)
> +#define PHYS_MASK_SHIFT		(CONFIG_ARM64_PA_BITS)
>   #define PHYS_MASK		((UL(1) << PHYS_MASK_SHIFT) - 1)
>   
>   /*
> 

Kristina,

The changes look good to me. I believe this patch and the next one could be merged
to patch 1 in the series.

Eitherway,

Reviewed-by: Suzuki K Poulose <suzuki.poulose at arm.com>

Cheers
Suzuki