[PATCH 01/10] arm64: add kconfig symbol to configure physical address size

[Kristina Martsenko]

On 14/12/17 10:22, Suzuki K Poulose wrote:
> On 13/12/17 17:07, Kristina Martsenko wrote:
>> ARMv8.2 introduces support for 52-bit physical addresses. To prepare for
>> supporting this, add a new kconfig symbol to configure the physical
>> address space size. The symbols will be used in subsequent patches.
>> Currently the only choice is 48, a later patch will add the option of 52
>> once the required code is in place.
>>
>> Signed-off-by: Kristina Martsenko <kristina.martsenko at arm.com>
>> ---
>>   arch/arm64/Kconfig | 16 ++++++++++++++++
>>   1 file changed, 16 insertions(+)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index a93339f5178f..8dc937823eeb 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -646,6 +646,22 @@ config ARM64_VA_BITS
>>       default 47 if ARM64_VA_BITS_47
>>       default 48 if ARM64_VA_BITS_48
>>   +choice
>> +    prompt "Physical address space size"
>> +    default ARM64_PA_BITS_48
>> +    help
>> +      Choose the maximum physical address range that the kernel will
>> +      support.
>> +
>> +config ARM64_PA_BITS_48
>> +    bool "48-bit"
>> +
>> +endchoice
>> +
>> +config ARM64_PA_BITS
>> +    int
>> +    default 48 if ARM64_PA_BITS_48
>> +
>>   config CPU_BIG_ENDIAN
>>          bool "Build big-endian kernel"
>>          help
>>
> 
> We could replace most of the hard coded "48" PA limit values to ARM64_PA_BITS,
> now that we have a configurable entity. i.e, you could fold  patch 7 & 8 into
> this one.

Makes sense, I'll merge patches 7 and 8 into this one in v2.

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

Thanks!

Kristina