[PATCH v2 7/8] arm64: allow ID map to be extended to 52 bits

[Suzuki K Poulose]

>> diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
>> index accc2ff32a0e..7991718890c6 100644
>> --- a/arch/arm64/include/asm/mmu_context.h
>> +++ b/arch/arm64/include/asm/mmu_context.h
>> @@ -63,11 +63,21 @@ static inline void cpu_set_reserved_ttbr0(void)
>>    * physical memory, in which case it will be smaller.
>>    */
>>   extern u64 idmap_t0sz;
>> +extern u64 idmap_ptrs_per_pgd;
>> -static inline bool __cpu_uses_extended_idmap(void)
>> +static inline bool __cpu_uses_extended_idmap_level(void)
>>   {
>> -    return (!IS_ENABLED(CONFIG_ARM64_VA_BITS_48) &&
>> -        unlikely(idmap_t0sz != TCR_T0SZ(VA_BITS)));
>> +    return ARM64_HW_PGTABLE_LEVELS((64 - idmap_t0sz)) > CONFIG_PGTABLE_LEVELS;
>> +}
>> +
>> +/*
>> + * True if the extended ID map requires an extra level of translation table
>> + * to be configured.
>> + */
>> +static inline bool __cpu_uses_extended_idmap_table(void)
>> +{
>> +    return __cpu_uses_extended_idmap_level() &&
>> +        (idmap_ptrs_per_pgd == PTRS_PER_PGD);
>>   }
> 
> As discussed offline, I was talking about changing
> 
>   __cpu_uses_extended_idmap_table =>  __cpu_uses_extended_idmap_level.
> 
> And the __cpu_uses_extended_idmap() doesn't need any changes. i.e :
> It could look like :
> 
> static inline bool __cpu_uses_extended_idmap_level(void)
> {

Err.. that should be __cpu_uses_extended_idmap(void)